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windows-nt/Source/XPSP1/NT/base/mvdm/softpc.new/bios/spcmse.asm
CryptoAlgo Inc b3cac27891 Add source files
2020-09-26 16:20:57 +08:00

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; Program: Installable Device Driver for Mouse.
;
; Purpose: to provide compatability with the
; Microsoft MOUSE.SYS device driver.
; the code here installs the driver and
; hooks the IVT in exactly the same
; way as the current Insignia MOUSE.COM.
;
; Version: 1.00 Date: 28th October 1992.
;
; Author: Andrew Watson
;
; Revisions:
;
; 23-June-1994 Williamh, made mode 4/5 and 12 work.
;
; 12-Sep-1992 Jonle, Merged with ntio.sys
; optimized loading of IVT
;
; 5-March-1993 Andyw, Moved fullscreen text pointer code
; from 32bit land to 16bit driver for
; for speed purposes.
;
; This obj module is intially loaded in a temporary memory location
; along with ntio.sys. Ntio.sys will copy the resident code (marked by
; SpcMseBeg, SpcMseEnd) into the permanent memory location which resides
; just below the normal device drivers loaded by config.sys.
;
; The nonresident intialization code is run with CS= temp seg
; and DS= final seg.
;
;
;****************************************************************
.286
include vint.inc
;================================================================
; Defined constants used in the driver.
;================================================================
VERSIONID equ 0BEEFh
MAXCMD equ 16
UNKNOWN equ 8003h
DONE equ 0100h
MOUSEVER equ 0003h
INT1_BOP equ 0BAh
INT2_BOP equ 0BBh
IO_LANG_BOP equ 0BCh
IO_INTR_BOP equ 0BDh
VIDEO_IO_BOP equ 0BEh
UNSIMULATE_BOP equ 0FEh
VIDEO equ 010h
UNEXP_BOP equ 2
FORCE_YODA equ 05bh
ANDYS_BOP equ 060h
STACKSIZE equ 200h-1
TRUE equ 0
FALSE equ 1
STORED equ 0
NOTSTORED equ 1
ON equ 0
OFF equ 1
MAJOR_RELEASE_NUMBER equ 6
MINOR_RELEASE_NUMBER equ 26
;MACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROS
bop MACRO callid
db 0c4h,0c4h,callid
endm
;=============================================================================
; Macro to reassign the stack segment register to point at the driver code
; segment and the stack pointer to point to the most significant word in an
; array reserved as the driver stack.
;=============================================================================
;; !!!! interrupt must be disabled before calling this function !!!!!!
make_stack MACRO
LOCAL reent ;; a local symbol to this macro
;; call DOCLI ;; turn off interrupts during this
;; macro's execution even if the CPU
;; does this for you when modifying SS
inc cs:reentrant ;; has the interrupt been nested?
jnz reent ;; not reentrant if == zero
;; The driver code is not reentrant, so start the stack at the beginning
mov cs:top_of_stack,ss ;; save the entry SS
mov cs:top_of_stack-2,sp ;; save SP on the stack
push cs ;; the current code/data segment
pop ss ;; point SS at CS
;; point SP at the next free stack location.
mov sp,offset top_of_stack-2 ;; The current stack pointer position
reent: ;; REENTRANT > 0 therefore reentrancy exists
;; The driver has gone reentrant due to a nested interrupt, so just
;; leave the stack alone because it is the same under reentrancy.
;; call DOSTI ;; reenable interrupts
ENDM
;=============================================================================
; Macro to return the stack pointer and segment back to what it was when
; the driver was called.
;=============================================================================
kill_stack MACRO
LOCAL reent1
;; cli
cmp cs:reentrant,0 ;; is the code currently reentrant?
jg reent1 ;; yes it is
mov sp,cs:top_of_stack-2 ;; pop SP
mov ss,cs:top_of_stack ;; pop SS
reent1:
dec cs:reentrant ;; reduce the level of reentrancy
;; call DOSTI
ENDM
;MACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROSMACROS
;
; Segment definitions for ntio.sys,
;
include biosseg.inc
SpcMseSeg segment
assume cs:SpcMseSeg, ds:nothing, es:nothing
;
; SpcMseBeg - SpcMseEnd
;
; Marks the resident code, anything outside of these markers
; is discarded after intialization
; 15-Sep-1992 Jonle
;
public SpcMseBeg
SpcMseBeg label byte
; CAUTION: for crazy apps mouse recognition
;
; The offset for int33h_vector must not be Zero for Borlands QuattroPro
; The segment must not be in ROM area for pctools
; to keep the int33h_vector from having an offset of ZERO
; I have moved the data above it
; 25-Sep-1992 Jonle
; describe the default screen and cursor masks
; remember that x86 machines are little-endian
;;; include pointer.inc
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;; We'll Get this back to an include file soon but I'm including it like
;;;; this for 'diplomatic' reasons. (ie I want to check this in without
;;;; also doing an 'addfile' at this stage)!!! - Simon.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; This data will be accessed, on occasion, word by word, so
; be tidy and align to a word boundary
align 2
; Describe the default mouse pointer image. This is used if the
; user decides to switch on the pointer without specifying an image.
default_cursor dw 0011111111111111b
dw 0001111111111111b
dw 0000111111111111b
dw 0000011111111111b
dw 0000001111111111b
dw 0000000111111111b
dw 0000000011111111b
dw 0000000001111111b
dw 0000000000111111b
dw 0000000000011111b
dw 0000000111111111b
dw 0001000011111111b
dw 0011000011111111b
dw 1111100001111111b
dw 1111100001111111b
dw 1111110001111111b
dw 0000000000000000b
dw 0100000000000000b
dw 0110000000000000b
dw 0111000000000000b
dw 0111100000000000b
dw 0111110000000000b
dw 0111111000000000b
dw 0111111100000000b
dw 0111111110000000b
dw 0111110000000000b
dw 0110110000000000b
dw 0100011000000000b
dw 0000011000000000b
dw 0000001100000000b
dw 0000001100000000b
dw 0000000000000000b
; Set up the memory where the working cursor is situated. It is
; initialised to the default cursor image
;****************** ALIGNED FOR PIXEL ZERO *******************************
; screen mask
even
current_cursor db 00111111b,11111111b,11111111b
db 00011111b,11111111b,11111111b
db 00001111b,11111111b,11111111b
db 00000111b,11111111b,11111111b
db 00000011b,11111111b,11111111b
db 00000001b,11111111b,11111111b
db 00000000b,11111111b,11111111b
db 00000000b,01111111b,11111111b
db 00000000b,00111111b,11111111b
db 00000000b,00011111b,11111111b
db 00000001b,11111111b,11111111b
db 00010000b,11111111b,11111111b
db 00110000b,11111111b,11111111b
db 11111000b,01111111b,11111111b
db 11111000b,01111111b,11111111b
db 11111100b,01111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 01000000b,00000000b,00000000b
db 01100000b,00000000b,00000000b
db 01110000b,00000000b,00000000b
db 01111000b,00000000b,00000000b
db 01111100b,00000000b,00000000b
db 01111110b,00000000b,00000000b
db 01111111b,00000000b,00000000b
db 01111111b,10000000b,00000000b
db 01111111b,11000000b,00000000b
db 01101100b,00000000b,00000000b
db 01000110b,00000000b,00000000b
db 00000110b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL ONE *******************************
; screen mask
AlignData1:
db 10011111b,11111111b,11111111b
db 10001111b,11111111b,11111111b
db 10000111b,11111111b,11111111b
db 10000011b,11111111b,11111111b
db 10000001b,11111111b,11111111b
db 10000000b,11111111b,11111111b
db 10000000b,01111111b,11111111b
db 10000000b,00111111b,11111111b
db 10000000b,00011111b,11111111b
db 10000000b,00001111b,11111111b
db 10000000b,11111111b,11111111b
db 10001000b,01111111b,11111111b
db 10011000b,01111111b,11111111b
db 11111100b,00111111b,11111111b
db 11111100b,00111111b,11111111b
db 11111110b,00111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00100000b,00000000b,00000000b
db 00110000b,00000000b,00000000b
db 00111000b,00000000b,00000000b
db 00111100b,00000000b,00000000b
db 00111110b,00000000b,00000000b
db 00111111b,00000000b,00000000b
db 00111111b,10000000b,00000000b
db 00111111b,11000000b,00000000b
db 00111111b,11100000b,00000000b
db 00110110b,00000000b,00000000b
db 00100011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000001b,10000000b,00000000b
db 00000001b,10000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL TWO *******************************
; screen mask
AlignData2:
db 11001111b,11111111b,11111111b
db 11000111b,11111111b,11111111b
db 11000011b,11111111b,11111111b
db 11000001b,11111111b,11111111b
db 11000000b,11111111b,11111111b
db 11000000b,01111111b,11111111b
db 11000000b,00111111b,11111111b
db 11000000b,00011111b,11111111b
db 11000000b,00001111b,11111111b
db 11000000b,00000111b,11111111b
db 11000000b,01111111b,11111111b
db 11000100b,00111111b,11111111b
db 11001100b,00111111b,11111111b
db 11111110b,00011111b,11111111b
db 11111110b,00011111b,11111111b
db 11111111b,00011111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00010000b,00000000b,00000000b
db 00011000b,00000000b,00000000b
db 00011100b,00000000b,00000000b
db 00011110b,00000000b,00000000b
db 00011111b,00000000b,00000000b
db 00011111b,10000000b,00000000b
db 00011111b,11000000b,00000000b
db 00011111b,11100000b,00000000b
db 00011111b,11110000b,00000000b
db 00011011b,00000000b,00000000b
db 00010001b,10000000b,00000000b
db 00000001b,10000000b,00000000b
db 00000000b,11000000b,00000000b
db 00000000b,11000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL THREE *******************************
; screen mask
AlignData3:
db 11100111b,11111111b,11111111b
db 11100011b,11111111b,11111111b
db 11100001b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100000b,01111111b,11111111b
db 11100000b,00111111b,11111111b
db 11100000b,00011111b,11111111b
db 11100000b,00001111b,11111111b
db 11100000b,00000111b,11111111b
db 11100000b,00000011b,11111111b
db 11100000b,00111111b,11111111b
db 11100010b,00011111b,11111111b
db 11100110b,00011111b,11111111b
db 11111111b,00001111b,11111111b
db 11111111b,00001111b,11111111b
db 11111111b,10001111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00001000b,00000000b,00000000b
db 00001100b,00000000b,00000000b
db 00001110b,00000000b,00000000b
db 00001111b,00000000b,00000000b
db 00001111b,10000000b,00000000b
db 00001111b,11000000b,00000000b
db 00001111b,11100000b,00000000b
db 00001111b,11110000b,00000000b
db 00001111b,11111000b,00000000b
db 00001101b,10000000b,00000000b
db 00001000b,11000000b,00000000b
db 00000000b,11000000b,00000000b
db 00000000b,01100000b,00000000b
db 00000000b,01100000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FOUR *******************************
; screen mask
AlignData4:
db 11110011b,11111111b,11111111b
db 11110001b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,01111111b,11111111b
db 11110000b,00111111b,11111111b
db 11110000b,00011111b,11111111b
db 11110000b,00001111b,11111111b
db 11110000b,00000111b,11111111b
db 11110000b,00000011b,11111111b
db 11110000b,00000001b,11111111b
db 11110000b,00011111b,11111111b
db 11110001b,00001111b,11111111b
db 11110011b,00001111b,11111111b
db 11111111b,10000111b,11111111b
db 11111111b,10000111b,11111111b
db 11111111b,11000111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000100b,00000000b,00000000b
db 00000110b,00000000b,00000000b
db 00000111b,00000000b,00000000b
db 00000111b,10000000b,00000000b
db 00000111b,11000000b,00000000b
db 00000111b,11100000b,00000000b
db 00000111b,11110000b,00000000b
db 00000111b,11111000b,00000000b
db 00000111b,11111100b,00000000b
db 00000110b,11000000b,00000000b
db 00000100b,01100000b,00000000b
db 00000000b,01100000b,00000000b
db 00000000b,00110000b,00000000b
db 00000000b,00110000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FIVE *******************************
; screen mask
AlignData5:
db 11111001b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,01111111b,11111111b
db 11111000b,00111111b,11111111b
db 11111000b,00011111b,11111111b
db 11111000b,00001111b,11111111b
db 11111000b,00000111b,11111111b
db 11111000b,00000011b,11111111b
db 11111000b,00000001b,11111111b
db 11111000b,00000000b,11111111b
db 11111000b,00001111b,11111111b
db 11111000b,10000111b,11111111b
db 11111001b,10000111b,11111111b
db 11111111b,11000011b,11111111b
db 11111111b,11000011b,11111111b
db 11111111b,11100011b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000010b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,10000000b,00000000b
db 00000011b,11000000b,00000000b
db 00000011b,11100000b,00000000b
db 00000011b,11110000b,00000000b
db 00000011b,11111000b,00000000b
db 00000011b,11111100b,00000000b
db 00000011b,11111110b,00000000b
db 00000011b,01100000b,00000000b
db 00000010b,00110000b,00000000b
db 00000000b,00110000b,00000000b
db 00000000b,00011000b,00000000b
db 00000000b,00011000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SIX *******************************
; screen mask
AlignData6:
db 11111100b,11111111b,11111111b
db 11111100b,01111111b,11111111b
db 11111100b,00111111b,11111111b
db 11111100b,00011111b,11111111b
db 11111100b,00001111b,11111111b
db 11111100b,00000111b,11111111b
db 11111100b,00000011b,11111111b
db 11111100b,00000001b,11111111b
db 11111100b,00000000b,11111111b
db 11111100b,00000000b,01111111b
db 11111100b,00000111b,11111111b
db 11111100b,01000011b,11111111b
db 11111100b,11000011b,11111111b
db 11111111b,11100001b,11111111b
db 11111111b,11100001b,11111111b
db 11111111b,11110001b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,10000000b,00000000b
db 00000001b,11000000b,00000000b
db 00000001b,11100000b,00000000b
db 00000001b,11110000b,00000000b
db 00000001b,11111000b,00000000b
db 00000001b,11111100b,00000000b
db 00000001b,11111110b,00000000b
db 00000001b,11111111b,00000000b
db 00000001b,10110000b,00000000b
db 00000001b,00011000b,00000000b
db 00000000b,00011000b,00000000b
db 00000000b,00001100b,00000000b
db 00000000b,00001100b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SEVEN *******************************
; screen mask
AlignData7:
db 11111110b,01111111b,11111111b
db 11111110b,00111111b,11111111b
db 11111110b,00011111b,11111111b
db 11111110b,00001111b,11111111b
db 11111110b,00000111b,11111111b
db 11111110b,00000011b,11111111b
db 11111110b,00000001b,11111111b
db 11111110b,00000000b,11111111b
db 11111110b,00000000b,01111111b
db 11111110b,00000000b,00111111b
db 11111110b,00000011b,11111111b
db 11111110b,00100001b,11111111b
db 11111110b,01100001b,11111111b
db 11111111b,11110000b,11111111b
db 11111111b,11110000b,11111111b
db 11111111b,11111000b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000000b,10000000b,00000000b
db 00000000b,11000000b,00000000b
db 00000000b,11100000b,00000000b
db 00000000b,11110000b,00000000b
db 00000000b,11111000b,00000000b
db 00000000b,11111100b,00000000b
db 00000000b,11111110b,00000000b
db 00000000b,11111111b,00000000b
db 00000000b,11111111b,10000000b
db 00000000b,11011000b,00000000b
db 00000000b,10001100b,00000000b
db 00000000b,00001100b,00000000b
db 00000000b,00000110b,00000000b
db 00000000b,00000110b,00000000b
db 00000000b,00000000b,00000000b
; Data area reserved for the clipped cursor images. When the pointer
; reaches byte 78 in the current raster, the image needs to be clipped
; to prevent it from being wrapped to the left hand edge of the screen.
; The image below stops that from happening by loading the image with
; a 1's partial AND mask and a 0's partial XOR mask.
; Note that byte 79 also needs a clipped image set.
even
clip_cursor78 db 00111111b,11111111b,11111111b
db 00011111b,11111111b,11111111b
db 00001111b,11111111b,11111111b
db 00000111b,11111111b,11111111b
db 00000011b,11111111b,11111111b
db 00000001b,11111111b,11111111b
db 00000000b,11111111b,11111111b
db 00000000b,01111111b,11111111b
db 00000000b,00111111b,11111111b
db 00000000b,00011111b,11111111b
db 00000001b,11111111b,11111111b
db 00010000b,11111111b,11111111b
db 00110000b,11111111b,11111111b
db 11111000b,01111111b,11111111b
db 11111000b,01111111b,11111111b
db 11111100b,01111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 01000000b,00000000b,00000000b
db 01100000b,00000000b,00000000b
db 01110000b,00000000b,00000000b
db 01111000b,00000000b,00000000b
db 01111100b,00000000b,00000000b
db 01111110b,00000000b,00000000b
db 01111111b,00000000b,00000000b
db 01111111b,10000000b,00000000b
db 01111111b,11000000b,00000000b
db 01101100b,00000000b,00000000b
db 01000110b,00000000b,00000000b
db 00000110b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL ONE *******************************
; screen mask
AlignClip178:
db 10011111b,11111111b,11111111b
db 10001111b,11111111b,11111111b
db 10000111b,11111111b,11111111b
db 10000011b,11111111b,11111111b
db 10000001b,11111111b,11111111b
db 10000000b,11111111b,11111111b
db 10000000b,01111111b,11111111b
db 10000000b,00111111b,11111111b
db 10000000b,00011111b,11111111b
db 10000000b,00001111b,11111111b
db 10000000b,11111111b,11111111b
db 10001000b,01111111b,11111111b
db 10011000b,01111111b,11111111b
db 11111100b,00111111b,11111111b
db 11111100b,00111111b,11111111b
db 11111110b,00111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00100000b,00000000b,00000000b
db 00110000b,00000000b,00000000b
db 00111000b,00000000b,00000000b
db 00111100b,00000000b,00000000b
db 00111110b,00000000b,00000000b
db 00111111b,00000000b,00000000b
db 00111111b,10000000b,00000000b
db 00111111b,11000000b,00000000b
db 00111111b,11100000b,00000000b
db 00110110b,00000000b,00000000b
db 00100011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000001b,10000000b,00000000b
db 00000001b,10000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL TWO *******************************
; screen mask
AlignClip278:
db 11001111b,11111111b,11111111b
db 11000111b,11111111b,11111111b
db 11000011b,11111111b,11111111b
db 11000001b,11111111b,11111111b
db 11000000b,11111111b,11111111b
db 11000000b,01111111b,11111111b
db 11000000b,00111111b,11111111b
db 11000000b,00011111b,11111111b
db 11000000b,00001111b,11111111b
db 11000000b,00000111b,11111111b
db 11000000b,01111111b,11111111b
db 11000100b,00111111b,11111111b
db 11001100b,00111111b,11111111b
db 11111110b,00011111b,11111111b
db 11111110b,00011111b,11111111b
db 11111111b,00011111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00010000b,00000000b,00000000b
db 00011000b,00000000b,00000000b
db 00011100b,00000000b,00000000b
db 00011110b,00000000b,00000000b
db 00011111b,00000000b,00000000b
db 00011111b,10000000b,00000000b
db 00011111b,11000000b,00000000b
db 00011111b,11100000b,00000000b
db 00011111b,11110000b,00000000b
db 00011011b,00000000b,00000000b
db 00010001b,10000000b,00000000b
db 00000001b,10000000b,00000000b
db 00000000b,11000000b,00000000b
db 00000000b,11000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL THREE *******************************
; screen mask
AlignClip378:
db 11100111b,11111111b,11111111b
db 11100011b,11111111b,11111111b
db 11100001b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100000b,01111111b,11111111b
db 11100000b,00111111b,11111111b
db 11100000b,00011111b,11111111b
db 11100000b,00001111b,11111111b
db 11100000b,00000111b,11111111b
db 11100000b,00000011b,11111111b
db 11100000b,00111111b,11111111b
db 11100010b,00011111b,11111111b
db 11100110b,00011111b,11111111b
db 11111111b,00001111b,11111111b
db 11111111b,00001111b,11111111b
db 11111111b,10001111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00001000b,00000000b,00000000b
db 00001100b,00000000b,00000000b
db 00001110b,00000000b,00000000b
db 00001111b,00000000b,00000000b
db 00001111b,10000000b,00000000b
db 00001111b,11000000b,00000000b
db 00001111b,11100000b,00000000b
db 00001111b,11110000b,00000000b
db 00001111b,11111000b,00000000b
db 00001101b,10000000b,00000000b
db 00001000b,11000000b,00000000b
db 00000000b,11000000b,00000000b
db 00000000b,01100000b,00000000b
db 00000000b,01100000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FOUR *******************************
; screen mask
AlignClip478:
db 11110011b,11111111b,11111111b
db 11110001b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,01111111b,11111111b
db 11110000b,00111111b,11111111b
db 11110000b,00011111b,11111111b
db 11110000b,00001111b,11111111b
db 11110000b,00000111b,11111111b
db 11110000b,00000011b,11111111b
db 11110000b,00000001b,11111111b
db 11110000b,00011111b,11111111b
db 11110001b,00001111b,11111111b
db 11110011b,00001111b,11111111b
db 11111111b,10000111b,11111111b
db 11111111b,10000111b,11111111b
db 11111111b,11000111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000100b,00000000b,00000000b
db 00000110b,00000000b,00000000b
db 00000111b,00000000b,00000000b
db 00000111b,10000000b,00000000b
db 00000111b,11000000b,00000000b
db 00000111b,11100000b,00000000b
db 00000111b,11110000b,00000000b
db 00000111b,11111000b,00000000b
db 00000111b,11111100b,00000000b
db 00000110b,11000000b,00000000b
db 00000100b,01100000b,00000000b
db 00000000b,01100000b,00000000b
db 00000000b,00110000b,00000000b
db 00000000b,00110000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FIVE *******************************
; screen mask
AlignClip578:
db 11111001b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,01111111b,11111111b
db 11111000b,00111111b,11111111b
db 11111000b,00011111b,11111111b
db 11111000b,00001111b,11111111b
db 11111000b,00000111b,11111111b
db 11111000b,00000011b,11111111b
db 11111000b,00000001b,11111111b
db 11111000b,00000000b,11111111b
db 11111000b,00001111b,11111111b
db 11111000b,10000111b,11111111b
db 11111001b,10000111b,11111111b
db 11111111b,11000011b,11111111b
db 11111111b,11000011b,11111111b
db 11111111b,11100011b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000010b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,10000000b,00000000b
db 00000011b,11000000b,00000000b
db 00000011b,11100000b,00000000b
db 00000011b,11110000b,00000000b
db 00000011b,11111000b,00000000b
db 00000011b,11111100b,00000000b
db 00000011b,11111110b,00000000b
db 00000011b,01100000b,00000000b
db 00000010b,00110000b,00000000b
db 00000000b,00110000b,00000000b
db 00000000b,00011000b,00000000b
db 00000000b,00011000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SIX *******************************
; screen mask
AlignClip678:
db 11111100b,11111111b,11111111b
db 11111100b,01111111b,11111111b
db 11111100b,00111111b,11111111b
db 11111100b,00011111b,11111111b
db 11111100b,00001111b,11111111b
db 11111100b,00000111b,11111111b
db 11111100b,00000011b,11111111b
db 11111100b,00000001b,11111111b
db 11111100b,00000000b,11111111b
db 11111100b,00000000b,11111111b
db 11111100b,00000111b,11111111b
db 11111100b,01000011b,11111111b
db 11111100b,11000011b,11111111b
db 11111111b,11100001b,11111111b
db 11111111b,11100001b,11111111b
db 11111111b,11110001b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,10000000b,00000000b
db 00000001b,11000000b,00000000b
db 00000001b,11100000b,00000000b
db 00000001b,11110000b,00000000b
db 00000001b,11111000b,00000000b
db 00000001b,11111100b,00000000b
db 00000001b,11111110b,00000000b
db 00000001b,11111111b,00000000b
db 00000001b,10110000b,00000000b
db 00000001b,00011000b,00000000b
db 00000000b,00011000b,00000000b
db 00000000b,00001100b,00000000b
db 00000000b,00001100b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SEVEN *******************************
; screen mask
AlignClip778:
db 11111110b,01111111b,11111111b
db 11111110b,00111111b,11111111b
db 11111110b,00011111b,11111111b
db 11111110b,00001111b,11111111b
db 11111110b,00000111b,11111111b
db 11111110b,00000011b,11111111b
db 11111110b,00000001b,11111111b
db 11111110b,00000000b,11111111b
db 11111110b,00000000b,11111111b
db 11111110b,00000000b,11111111b
db 11111110b,00000011b,11111111b
db 11111110b,00100001b,11111111b
db 11111110b,01100001b,11111111b
db 11111111b,11110000b,11111111b
db 11111111b,11110000b,11111111b
db 11111111b,11111000b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000000b,10000000b,00000000b
db 00000000b,11000000b,00000000b
db 00000000b,11100000b,00000000b
db 00000000b,11110000b,00000000b
db 00000000b,11111000b,00000000b
db 00000000b,11111100b,00000000b
db 00000000b,11111110b,00000000b
db 00000000b,11111111b,00000000b
db 00000000b,11111111b,00000000b
db 00000000b,11011000b,00000000b
db 00000000b,10001100b,00000000b
db 00000000b,00001100b,00000000b
db 00000000b,00000110b,00000000b
db 00000000b,00000110b,00000000b
db 00000000b,00000000b,00000000b
clip_cursor79 db 00111111b,11111111b,11111111b
db 00011111b,11111111b,11111111b
db 00001111b,11111111b,11111111b
db 00000111b,11111111b,11111111b
db 00000011b,11111111b,11111111b
db 00000001b,11111111b,11111111b
db 00000000b,11111111b,11111111b
db 00000000b,11111111b,11111111b
db 00000000b,11111111b,11111111b
db 00000000b,11111111b,11111111b
db 00000001b,11111111b,11111111b
db 00010000b,11111111b,11111111b
db 00110000b,11111111b,11111111b
db 11111000b,01111111b,11111111b
db 11111000b,01111111b,11111111b
db 11111100b,01111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 01000000b,00000000b,00000000b
db 01100000b,00000000b,00000000b
db 01110000b,00000000b,00000000b
db 01111000b,00000000b,00000000b
db 01111100b,00000000b,00000000b
db 01111110b,00000000b,00000000b
db 01111111b,00000000b,00000000b
db 01111111b,00000000b,00000000b
db 01111111b,00000000b,00000000b
db 01101100b,00000000b,00000000b
db 01000110b,00000000b,00000000b
db 00000110b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL ONE *******************************
; screen mask
AlignClip179:
db 10011111b,11111111b,11111111b
db 10001111b,11111111b,11111111b
db 10000111b,11111111b,11111111b
db 10000011b,11111111b,11111111b
db 10000001b,11111111b,11111111b
db 10000000b,11111111b,11111111b
db 10000000b,11111111b,11111111b
db 10000000b,11111111b,11111111b
db 10000000b,11111111b,11111111b
db 10000000b,11111111b,11111111b
db 10000000b,11111111b,11111111b
db 10001000b,11111111b,11111111b
db 10011000b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111110b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00100000b,00000000b,00000000b
db 00110000b,00000000b,00000000b
db 00111000b,00000000b,00000000b
db 00111100b,00000000b,00000000b
db 00111110b,00000000b,00000000b
db 00111111b,00000000b,00000000b
db 00111111b,00000000b,00000000b
db 00111111b,00000000b,00000000b
db 00111111b,00000000b,00000000b
db 00110110b,00000000b,00000000b
db 00100011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL TWO *******************************
; screen mask
AlignClip279:
db 11001111b,11111111b,11111111b
db 11000111b,11111111b,11111111b
db 11000011b,11111111b,11111111b
db 11000001b,11111111b,11111111b
db 11000000b,11111111b,11111111b
db 11000000b,11111111b,11111111b
db 11000000b,11111111b,11111111b
db 11000000b,11111111b,11111111b
db 11000000b,11111111b,11111111b
db 11000000b,11111111b,11111111b
db 11000000b,11111111b,11111111b
db 11000100b,11111111b,11111111b
db 11001100b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00010000b,00000000b,00000000b
db 00011000b,00000000b,00000000b
db 00011100b,00000000b,00000000b
db 00011110b,00000000b,00000000b
db 00011111b,00000000b,00000000b
db 00011111b,00000000b,00000000b
db 00011111b,00000000b,00000000b
db 00011111b,00000000b,00000000b
db 00011111b,00000000b,00000000b
db 00011011b,00000000b,00000000b
db 00010001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL THREE *******************************
; screen mask
AlignClip379:
db 11100111b,11111111b,11111111b
db 11100011b,11111111b,11111111b
db 11100001b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100000b,11111111b,11111111b
db 11100010b,11111111b,11111111b
db 11100110b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00001000b,00000000b,00000000b
db 00001100b,00000000b,00000000b
db 00001110b,00000000b,00000000b
db 00001111b,00000000b,00000000b
db 00001111b,00000000b,00000000b
db 00001111b,00000000b,00000000b
db 00001111b,00000000b,00000000b
db 00001111b,00000000b,00000000b
db 00001111b,00000000b,00000000b
db 00001101b,00000000b,00000000b
db 00001000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FOUR *******************************
; screen mask
AlignClip479:
db 11110011b,11111111b,11111111b
db 11110001b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110000b,11111111b,11111111b
db 11110001b,11111111b,11111111b
db 11110011b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000100b,00000000b,00000000b
db 00000110b,00000000b,00000000b
db 00000111b,00000000b,00000000b
db 00000111b,00000000b,00000000b
db 00000111b,00000000b,00000000b
db 00000111b,00000000b,00000000b
db 00000111b,00000000b,00000000b
db 00000111b,00000000b,00000000b
db 00000111b,00000000b,00000000b
db 00000110b,00000000b,00000000b
db 00000100b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL FIVE *******************************
; screen mask
AlignClip579:
db 11111001b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111000b,11111111b,11111111b
db 11111001b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000010b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000011b,00000000b,00000000b
db 00000010b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SIX *******************************
; screen mask
AlignClip679:
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111100b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000001b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
;****************** ALIGNED FOR PIXEL SEVEN *******************************
; screen mask
AlignClip779:
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111110b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
db 11111111b,11111111b,11111111b
; cursor mask
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
db 00000000b,00000000b,00000000b
CursorOffsetLUT dw current_cursor
dw AlignData1
dw AlignData2
dw AlignData3
dw AlignData4
dw AlignData5
dw AlignData6
dw AlignData7
ClipOffsetLUT78 dw clip_cursor78
dw AlignClip178
dw AlignClip278
dw AlignClip378
dw AlignClip478
dw AlignClip578
dw AlignClip678
dw AlignClip778
ClipOffsetLUT79 dw clip_cursor79
dw AlignClip179
dw AlignClip279
dw AlignClip379
dw AlignClip479
dw AlignClip579
dw AlignClip679
dw AlignClip779
; pointer to the current look up table set for the pointer image.
; The LUTs are swapped when the pointer enters bytes 78 and 79
; along a scanline to prevent the pointer wrapping around the screen.
PointerLUT label word
dw offset CursorOffsetLUT
;;;;;;;;;;;;;;;;;;;;;;;
;;;; End of what should be an include for pointer.inc
;;;;;;;;;;;;;;;;;;;;;;;
even
clrgend dw 06e41h,07964h,05720h,07461h,06f73h,0f36eh
hiresylut dw 350,350,480,480
;============================================================================
; Surprisingly, a look up table multiply is much faster than
; the shift - add instruction sequence for multiplying by 80.
; So it would be silly not to use it eh? Times by 80 is needed
; to convert a raster location (1 raster = 80 bytes) in pixel
; y coordinates into a video buffer byte index
; Note: Multiply by 80 is also used for text mode calculations
; now! Andy on the 9/3/93
;============================================================================
even
mult80lut label word
mulsum=0
REPT 480 ; number of VGA scanlines for mode 12h
dw mulsum
mulsum=mulsum+80
ENDM
;============================================================================
; A table to do a multiply by 320. This is used for converting number of
; rasters into video buffer offsets for mode 13h (256 VGA colour mode).
;============================================================================
even
mult320lut label word
mulsum=0
REPT 200 ; number of VGA scanlines for mode 13h
dw mulsum
mulsum=mulsum+320
ENDM
even
;============================================================================
; Look up table for use with modes 10h and 12h. This table provides the means
; for the selection of a clipped or unclipped pointer image depending on the
; current x position of the pointer.
;============================================================================
ChooseImageLUT label word
REPT 624
dw offset CursorOffsetLUT
ENDM
REPT 8
dw offset ClipOffsetLUT78
ENDM
REPT 8
dw offset ClipOffsetLUT79
ENDM
;============================================================================
; Buffer arranged for 4 plane EGA video modes. The screen where
; the pointer is going to be drawn is scanned plane by plane and
; saved as bitplane separations.
;============================================================================
even ; make sure that this data is word aligned
behindcursor dw 24 dup(?) ; Plane 0
dw 24 dup(?) ; Plane 1
dw 24 dup(?) ; Plane 2
dw 24 dup(?) ; Plane 3
;============================================================================
; a table of the video buffer segment for the supported
; BIOS text and graphics modes.
;============================================================================
even ; make sure that this data is word aligned
videomodetable dw 0b800h,0b800h ; modes 0,1
dw 0b800h,0b800h ; modes 2,3
dw 0b800h,0b800h ; modes 4,5
dw 0b800h,0b000h ; modes 6,7
dw 0ffffh,0ffffh ; n/a
dw 0ffffh,0ffffh ; n/a
dw 0ffffh,0a000h ; n/a,mode 0dh
dw 0a000h,0a000h ; modes 0eh,0fh
dw 0a000h,0a000h ; modes 10h,11h
dw 0a000h,0a000h ; modes 12h,13h
videobufferseg dw ?
even ; make sure that this data is word aligned
hotspot dw 2 dup(0)
VRAMlasttextcelloff label word ; last text offset in VRAM
VRAMlastbyteoff dw ? ; Last offset in VRAM
VRAMlastbitoff dw ? ; LSB: Where pointer is in byte
; MSB: ODD/EVEN of the pointer
; first scan line
LastXCounters dw ? ; last X looping counter
LastYCounters dw ? ; last Y looping counter
; ODD in LSB and EVEN in MSB
lasttextimage dw ? ; text cell from last time
background dw NOTSTORED ; STORED if data in buffer
current_position_x dw ?
current_position_y dw ?
vidbytealigned dw ?
lastmaskrotate dw ?
lastvidmode db 0ffh ; the video mode during the last int.
internalCF db 0ffh ; the mouse driver keeps a flag called
; the internal cursor flag. If the flag
; = 0, then int 33h f1 will display the
; pointer, -1 = default value.
; 32 bit code writes to this area on a hardware interrupt and
; when an app does an int 33h function 3, it reads the data
; directly from here.
; Data format is: word 0 -> button status
; word 1 -> x virtual coordinate
; word 2 -> y virtual coordinate
function3data dw 3 dup(?)
conditional_off db 0 ;!= 0 if conditional off is on
;
;=============================================================================
; Data to determine the address of where the latches should be saved in the
; video buffer for the current video mode.
; latchcache contains the value looked up by saveVGAregisters and used by
; restoreVGAregisters.
;=============================================================================
latchcache dw ? ; location of latch cache in VRAM
even
latchhomeLUT label word
dw ? ; mode 0
dw ? ; mode 1
dw ? ; mode 2
dw ? ; mode 3
dw ? ; mode 4
dw ? ; mode 5
dw ? ; mode 6
dw ? ; mode 7
dw ? ; mode 8
dw ? ; mode 9
dw ? ; mode a
dw ? ; mode b
dw ? ; mode c
dw ? ; mode d
dw 80*200+78 ; mode e
dw 80*350+78 ; mode f
dw 80*350+78 ; mode 10
dw 80*480+78 ; mode 11
dw 80*480+78 ; mode 12
;=============================================================================
; CGA video mode 4 is a 2 bit per pixel graphics mode. The pointer images
; received from the application (or the default images for that matter) are
; described by a one bit per pixel map. This look up table provides the means
; of conversion from one to two bits per pixel.
;=============================================================================
even
LUT1to2bit label word
dw 00000h,00003h,0000Ch,0000Fh,00030h,00033h,0003Ch,0003Fh
dw 000C0h,000C3h,000CCh,000CFh,000F0h,000F3h,000FCh,000FFh
dw 00300h,00303h,0030Ch,0030Fh,00330h,00333h,0033Ch,0033Fh
dw 003C0h,003C3h,003CCh,003CFh,003F0h,003F3h,003FCh,003FFh
dw 00C00h,00C03h,00C0Ch,00C0Fh,00C30h,00C33h,00C3Ch,00C3Fh
dw 00CC0h,00CC3h,00CCCh,00CCFh,00CF0h,00CF3h,00CFCh,00CFFh
dw 00F00h,00F03h,00F0Ch,00F0Fh,00F30h,00F33h,00F3Ch,00F3Fh
dw 00FC0h,00FC3h,00FCCh,00FCFh,00FF0h,00FF3h,00FFCh,00FFFh
dw 03000h,03003h,0300Ch,0300Fh,03030h,03033h,0303Ch,0303Fh
dw 030C0h,030C3h,030CCh,030CFh,030F0h,030F3h,030FCh,030FFh
dw 03300h,03303h,0330Ch,0330Fh,03330h,03333h,0333Ch,0333Fh
dw 033C0h,033C3h,033CCh,033CFh,033F0h,033F3h,033FCh,033FFh
dw 03C00h,03C03h,03C0Ch,03C0Fh,03C30h,03C33h,03C3Ch,03C3Fh
dw 03CC0h,03CC3h,03CCCh,03CCFh,03CF0h,03CF3h,03CFCh,03CFFh
dw 03F00h,03F03h,03F0Ch,03F0Fh,03F30h,03F33h,03F3Ch,03F3Fh
dw 03FC0h,03FC3h,03FCCh,03FCFh,03FF0h,03FF3h,03FFCh,03FFFh
dw 0C000h,0C003h,0C00Ch,0C00Fh,0C030h,0C033h,0C03Ch,0C03Fh
dw 0C0C0h,0C0C3h,0C0CCh,0C0CFh,0C0F0h,0C0F3h,0C0FCh,0C0FFh
dw 0C300h,0C303h,0C30Ch,0C30Fh,0C330h,0C333h,0C33Ch,0C33Fh
dw 0C3C0h,0C3C3h,0C3CCh,0C3CFh,0C3F0h,0C3F3h,0C3FCh,0C3FFh
dw 0CC00h,0CC03h,0CC0Ch,0CC0Fh,0CC30h,0CC33h,0CC3Ch,0CC3Fh
dw 0CCC0h,0CCC3h,0CCCCh,0CCCFh,0CCF0h,0CCF3h,0CCFCh,0CCFFh
dw 0CF00h,0CF03h,0CF0Ch,0CF0Fh,0CF30h,0CF33h,0CF3Ch,0CF3Fh
dw 0CFC0h,0CFC3h,0CFCCh,0CFCFh,0CFF0h,0CFF3h,0CFFCh,0CFFFh
dw 0F000h,0F003h,0F00Ch,0F00Fh,0F030h,0F033h,0F03Ch,0F03Fh
dw 0F0C0h,0F0C3h,0F0CCh,0F0CFh,0F0F0h,0F0F3h,0F0FCh,0F0FFh
dw 0F300h,0F303h,0F30Ch,0F30Fh,0F330h,0F333h,0F33Ch,0F33Fh
dw 0F3C0h,0F3C3h,0F3CCh,0F3CFh,0F3F0h,0F3F3h,0F3FCh,0F3FFh
dw 0FC00h,0FC03h,0FC0Ch,0FC0Fh,0FC30h,0FC33h,0FC3Ch,0FC3Fh
dw 0FCC0h,0FCC3h,0FCCCh,0FCCFh,0FCF0h,0FCF3h,0FCFCh,0FCFFh
dw 0FF00h,0FF03h,0FF0Ch,0FF0Fh,0FF30h,0FF33h,0FF3Ch,0FF3Fh
dw 0FFC0h,0FFC3h,0FFCCh,0FFCFh,0FFF0h,0FFF3h,0FFFCh,0FFFFh
;============================================================================
; Table for selection of the correct pointer image for the current location
; in the video buffer, when using video BIOS mode 4.
;============================================================================
mode4pointerLUT label word
REPT 76 ; for the first 76 bytes of scanline, use these
dw current_cursor
dw AlignData1
dw AlignData2
dw AlignData3
ENDM
dw clip_cursor78
dw AlignClip178
dw AlignClip278
dw AlignClip378
dw AlignClip478
dw AlignClip578
dw AlignClip678
dw AlignClip778
dw clip_cursor79
dw AlignClip179
dw AlignClip279
dw AlignClip379
dw AlignClip479
dw AlignClip579
dw AlignClip679
dw AlignClip779
;============================================================================
; Look up table to adjust CX on clipping in mode 4. This allows the mode4
; pointer drawing algorithm to use the modes 10h/12h clipped pointer data
; without having to modify it. The problem is that mode 10/12 expects the
; data to be 4 bits per pixel and aligned to a word, whereas mode 4 is 2 bits
; per pixel and aligns to a byte.
;============================================================================
mode4clipCXadjustLUT label word
adjtemp=0 ; data for pixel x-coordinates 0 -> 307
REPT 77
dw 4 dup(adjtemp)
adjtemp=adjtemp+1
ENDM
dw 4 dup(76) ; data for pixels 308 -> 311
dw 8 dup(78) ; data for pixels 312 -> 319
;============================================================================
; The CGA buffer is split at 2000h. Therefore if the pointer starts writing
; below scanline 199 on the video display, the odd scanline video buffer
; will become corrupted. In these cases, the pointer should be clipped to
; display scanline 199. The look up table below maps loop counters to a
; display scanline for this purpose.
;
; table arrangement (odd scanline data, even scanline data)
;
;============================================================================
mode4clipDXLUT label word
db 200-15 dup(8,8) ; scanlines 0 -> 184
db 8,7 ; scanline 185
db 7,7 ; scanline 186
db 7,6 ; scanline 187
db 6,6 ; scanline 188
db 6,5 ; scanline 189
db 5,5 ; scanline 190
db 5,4 ; scanline 191
db 4,4 ; scanline 192
db 4,3 ; scanline 193
db 3,3 ; scanline 194
db 3,2 ; scanline 195
db 2,2 ; scanline 196
db 2,1 ; scanline 197
db 1,1 ; scanline 198
db 1,0 ; scanline 199
mode4SelectedPointer label word
dw ?
;==========================================================================
; Some space into which the Medium resolution graphics pointer background
; gets stored. Note that the 256 colour mode buffer encroaches on that of
; mode 4.
;==========================================================================
bkgrnd256 label byte ; 256 colour buffer = 24*16 @ 1 byte/pix
db 384-64 dup(?) ; share the CGA buffer(=64 bytes)
CGAbackgrnd label byte
db 24/4*16 dup(?) ; 24 pixels/row @ 4 pixels/byte for 16
; rows.
;===========================================================================
; Jump table to redirect the code flow according to the current video mode.
; Used in the 32 bit entry point procedure.
; Pointer drawing routines.
;===========================================================================
even
drawpointerJMPT label word
dw offset not_supported ; mode 0
dw offset not_supported ; mode 1
IFDEF SIXTEENBIT
dw offset drawTextPointer ; mode 2
dw offset drawTextPointer ; mode 3
ELSE
dw offset not_supported ; mode 2
dw offset not_supported ; mode 3
ENDIF
dw offset drawMediumResPointer ; mode 4
dw offset drawMediumResPointer ; mode 5
dw offset not_supported ; mode 6
IFDEF SIXTEENBIT
dw offset drawTextPointer ; mode 7
ELSE
dw offset not_supported ; mode 7
ENDIF
dw offset not_supported ; mode 8
dw offset not_supported ; mode 9
dw offset not_supported ; mode a
dw offset not_supported ; mode b
dw offset not_supported ; mode c
dw offset not_supported ; mode d
dw offset not_supported ; mode e
dw offset drawHiResPointer ; mode f
dw offset drawHiResPointer ; mode 10
dw offset drawHiResPointer ; mode 11
dw offset drawHiResPointer ; mode 12
dw offset drawC256pointer ; mode 13
;===========================================================================
; Jump table to redirect the code flow according to the current video mode.
; Used in the 32 bit entry point procedure.
; INT 33h Function 1 support modules.
;===========================================================================
even
int33function1JMPT label word
dw offset not_supported ; mode 0
dw offset not_supported ; mode 1
IFDEF SIXTEENBIT
dw offset TextInt33Function1 ; mode 2
dw offset TextInt33Function1 ; mode 3
ELSE
dw offset not_supported ; mode 2
dw offset not_supported ; mode 3
ENDIF
dw offset MediumResInt33Function1 ; mode 4
dw offset MediumResInt33Function1 ; mode 5
dw offset not_supported ; mode 6
IFDEF SIXTEENBIT
dw offset TextInt33Function1 ; mode 7
ELSE
dw offset not_supported ; mode 7
ENDIF
dw offset not_supported ; mode 8
dw offset not_supported ; mode 9
dw offset not_supported ; mode a
dw offset not_supported ; mode b
dw offset not_supported ; mode c
dw offset not_supported ; mode d
dw offset not_supported ; mode e
dw offset HiResInt33Function1 ; mode f
dw offset HiResInt33Function1 ; mode 10
dw offset HiResInt33Function1 ; mode 11
dw offset HiResInt33Function1 ; mode 12
dw offset C256Int33Function1 ; mode 13
;===========================================================================
; Jump table to redirect the code flow according to the current video mode.
; Used in the 32 bit entry point procedure.
; INT 33h Function 2 support modules.
;===========================================================================
even
int33function2JMPT label word
dw offset not_supported ; mode 0
dw offset not_supported ; mode 1
IFDEF SIXTEENBIT
dw offset TextInt33Function2 ; mode 2
dw offset TextInt33Function2 ; mode 3
ELSE
dw offset not_supported ; mode 2
dw offset not_supported ; mode 3
ENDIF
dw offset MediumResInt33Function2 ; mode 4
dw offset MediumResInt33Function2 ; mode 5
dw offset not_supported ; mode 6
IFDEF SIXTEENBIT
dw offset TextInt33Function2 ; mode 7
ELSE
dw offset not_supported ; mode 7
ENDIF
dw offset not_supported ; mode 8
dw offset not_supported ; mode 9
dw offset not_supported ; mode a
dw offset not_supported ; mode b
dw offset not_supported ; mode c
dw offset not_supported ; mode d
dw offset not_supported ; mode e
dw offset HiResInt33Function2 ; mode f
dw offset HiResInt33Function2 ; mode 10
dw offset HiResInt33Function2 ; mode 11
dw offset HiResInt33Function2 ; mode 12
dw offset C256Int33Function2 ; mode 13
;==========================================================================
; Some storage space for the critical VGA registers.
;==========================================================================
;Sequencer Registers
seqregs label byte
db 4 dup(?) ; N.B. sequencer reset reg doesn't
; get saved.
; Graphics Controller Registers
GCregs label byte
db 9 dup(?)
;==========================================================================
; The mouse driver's very own stack. To prevent unnecessary tears,
; particulary from the application running in DOS land, a stack is
; maintained by the driver. This prevents the driver routines from
; blowing a very full stack elsewhere.
; N.B. on leaving the driver, the stack should be empty!
;==========================================================================
even
mouse_stack dw STACKSIZE dup(?)
top_of_stack label word
dw ? ; this is where the stack starts
;===========================================================================
; The memory variable below is incremented on entry to the 16 bit code
; and on exit, decremented. If an interrupt occurs during the execution of
; this 16 bit code, the flag is incremented again, and thus greater than zero
; so it is known that the code has been reentered and the stack must be
; maintained accordingly.
;===========================================================================
reentrant dw -1
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;
; END OF DATA
;
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;================================================================
; code to redirect the flow of control from the segment:offset for
; the mouse interrupt (33h) as indicated in the IVT (the IVT entry
; has been set to point to here) to the Insignia mouse driver code.
;================================================================
int33h_vector:
jmp short skip
; High level language entry point.
lvector db 0EAh ; far jump opcode
loffset dw ? ; destination offset
lseg dw ? ; destination segment
; The pointer set to our interrupt 33h handler
skip:
;
; Let's just jump to the C mouse_io_interrupt code for
; RISC and bypass the ROM like 4.0 does.
;
bop 0BDh
iret
db 0EAh ; far jump opcode
moff dw ? ; will be filled in by the driver code from the IVT
mseg dw ? ; as before
DOCLI:
FCLI
ret
DOSTI:
FSTI
ret
DOIRET:
FIRET
;================================================================
; Functions moved out of ROM - real ROMS mapped in
;================================================================
unexp_int:
bop UNEXP_BOP
jmp DOIRET
mouse_io:
;
; INT 33h entry point
;
jmp mio_hack
nop
mouse_io_lang: ; entry point for HLL
pushf ; check ASAP if redundant show/hide cursor
push di ; save di,
mov di, [di+14] ; get first parameter (mouse function),
; then duplicate mio_hack below.
; this has to be done to preserve
; compatibility between both ways to
; call the mouse.
jz lbop ; F0
cmp di,2
jg lbop ; >F2
je miol_2
miol_1:
mov conditional_off, 0 ; disable conditonal off
cmp [internalCF],0 ; is the flag already zero?
je miol_12_quit ; if so, do nothing
inc [internalCF] ; increment it
jz lbop
miol_12_quit:
pop di
popf
jmp DOIRET
miol_2:
dec [internalCF] ; decrement the pointer internal flag
cmp [internalCF], 0ffh; currently displayed?
jne miol_12_quit
lbop:
pop ax
popf
bop IO_LANG_BOP
retf 8
mio_hack: ; int 33h handler
pushf ; save up the flags
cmp ax,1 ; mouse show cursor.
je mio_1
cmp ax,2 ; mouse hide cursor.
je mio_2
cmp ax,3 ; get button status and mouse position.
je mio_3
cmp ax,9 ; set graphics cursor
je mio_9
cmp ax,10 ; set text cursor - not supported
je mio_quit ; return straight back to app.
jmp short hack1bop ; none of the above, so goto 32 bit land
mio_1:
mov conditional_off, 0 ; disable conditional off
cmp [internalCF],0 ; is the flag already zero?
je mio_quit ; if so, do nothing
inc [internalCF] ; increment it
jz hack1bop ; just turned zero, so turn pointer on
; via the 32 bit code.
mio_quit:
popf
jmp DOIRET
mio_2:
dec [internalCF] ; decrement the pointer internal flag
cmp [internalCF], 0ffh; currently displayed?
jne mio_quit ; Already turned off, so quit
hack1bop:
popf
bop IO_INTR_BOP ; BOP to the 32 bit part of the handler
jmp DOIRET ; return back after the BOP to caller
mio_9:
call int33function9 ; change the shape of the graphics pointer
popf ; restore the flag state
jmp DOIRET ; back to the caller
mio_3:
mov bx,[function3data] ; return button status
mov cx,[function3data+2] ; return x coordinate
mov dx,[function3data+4] ; return x coordinate
popf ; return back to the application
jmp DOIRET ; via an iret.
IFDEF MOUSE_VIDEO_BIOS
mouse_video_io:
pushf
or ah,ah
jne mvio1
jmp do_bop
mvio1:
cmp ax,6f05h
jne mvio2
jmp do_bop
mvio2:
cmp ah,4
jne mvio3
jmp do_bop
mvio3:
;=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
; Microsoft EGA.LIB function support
; input: AH = the function required
cmp ah,0f0h ; is function F0 or greater?
jge mvio4 ; YES, so check to see if less than or == F7
jmp go_rom ; NO, so do rom stuff
mvio4:
cmp ah,0f7h ; is it greater than F7
jg mvio5 ; YES, so test for == FA
jmp ega_lib ; NO, but in range F0 to F7, so do EGALIB emm
mvio5:
cmp ah,0fah
jne mvio6
jmp egaFA
mvio6:
jmp go_rom
; to get here, must want to do mouse video functions 0f0h to 0f7h or
; function 0fah.
jmp ega_lib
; data area for EGA.LIB function support
; Notice that the sequencer register buffer only has space
; for four entrys even though it actually has five addressable
; registers. The Sequencer RESET status is not stored, so the buffer
; is arranged thus:
; buffer offset 0 1 2 3
; register index 1 2 3 4
;
even
ega_current_crtc db 25 dup(?) ; driver's copy of CRTC regs
ega_current_seq db 4 dup(?) ; driver's copy of Seq regs
ega_current_graph db 9 dup(?) ; driver's copy of GC regs
ega_current_attr db 20 dup(?) ; driver's copy of AC regs
ega_current_misc db ? ; driver's copy of misc reg
dirty_crtc db 25 dup(?)
dirty_seq db 4 dup(?)
dirty_graph db 9 dup(?)
dirty_attr db 20 dup(?)
ega_default_crtc db 25 dup(?) ; default EGA register values
ega_default_seq db 4 dup(?) ; as set by the application
ega_default_graph db 9 dup(?) ; through a call to F7
ega_default_attr db 20 dup(?)
ega_default_misc db ?
relnum label word
release_major db MAJOR_RELEASE_NUMBER
release_minor db MINOR_RELEASE_NUMBER
even
egalibjmp label word ; crafty jump table to replace a base
; switch
dw egaF0 ; 0F0h - read one EGA register
dw egaF1 ; 0F1h - write one EGA register
dw egaF2 ; 0F2h - read register range
dw egaF3 ; 0F3h - write register range
dw egaF4 ; 0F4h - read register set
dw egaF5 ; 0F5h - write register set
dw egaF6 ; 0F6h - revert to default regs
dw egaF7 ; 0F7h - define deflt reg table
dw noint ; 0F8h is not a valid function
dw noint ; 0F9h is not a valid function
dw egaFA ; 0FAh - interrogate driver
ega_lib:
xor al,al
sub ax,0f0h ; create a jump table index
shl ax,1 ; remember that a word pointer is reqd
mov si,ax
jmp [egalibjmp+si] ; get the relavent jump address
egaF0: ;--- Read an EGA register ----------------------------------------------
pusha
and bx,0ffh ; just want the lower byte (BL)
F00:
cmp dx,0
jne F08
mov bl,byte ptr [ega_current_crtc+bx]
popa
jmp noint
F08:
cmp dx,8
jne F010
dec bx ; note that RESET is not stored
mov bl,byte ptr [ega_current_seq+bx]
popa
jmp noint
F010:
cmp dx,010h
jne F018
mov bl,byte ptr [ega_current_graph+bx]
popa
jmp noint
F018:
cmp dx,018h
jne F020
mov bl,byte ptr [ega_current_attr+bx]
popa
jmp noint
F020:
cmp dx,020h
jne F028
mov bl,byte ptr [ega_current_misc]
F028: ; do nothing for this case
F0quit:
popa
jmp noint
egaF1: ;--- Write an EGA register --------------------------------------------
F10:
pusha
cmp dx,0
jne F18
mov dx,03d4h ; write to the CRTC index register
mov ax,bx ; values to write to ports 3d4/3d5
out dx,ax ; do the write
mov di,bx ; save the written values to memory
and di,0ffh ; get just the lower 8 bits
mov byte ptr [ega_current_crtc+di],bh
mov byte ptr [dirty_crtc+di],1
popa
jmp noint
F18:
cmp dx,8
jne F110
mov dx,03c4h ; write to the Sequencer index register
mov ax,bx ; values to write to ports 3c4/3c5
out dx,ax ; do the write
cmp bl,0 ; Cannot index reset because it its
jle F18bra1 ; not stored. range = 1->4
and bx,0ffh ; just want BL
dec bx ; actually, one less than that
mov byte ptr [ega_current_seq+bx],ah
mov byte ptr [dirty_seq+bx],1
F18bra1:
popa
jmp noint
F110:
cmp dx,010h
jne F118
mov dx,03ceh ; write to the Graphics controller
mov ax,bx ; values to write to ports 3ce/3cf
out dx,ax ; do the write
mov di,bx ; save the written values to memory
and di,0ffh ; get just the lower 8 bits
mov byte ptr [ega_current_graph+di],bh
mov byte ptr [dirty_graph+di],1
popa
jmp noint
F118:
cmp dx,018h
jne F120
mov dx,03dah ; clear attribute controller index
in al,dx ; the read clears this register
mov ax,bx ; need to write BX to the ports
mov dx,03c0h ; Attribute Controller index register
out dx,ax ; do the write
inc dx
mov al,020h ; EGA palette enable
out dx,al ; enable the palette
mov di,bx ; save the written values to memory
and di,0ffh ; get just the lower 8 bits
mov byte ptr [ega_current_graph+di],bh
mov byte ptr [dirty_graph+di],1
popa
jmp noint
F120:
cmp dx,020h
jne F128
mov dx,03c2h ; EGA miscellaneous register
mov al,bl
out dx,al ; write to the register
mov [ega_current_misc],bl
popa
jmp noint
F128:
cmp dx,028h
jne F128
mov dx,03dah ; EGA feature register
mov al,bl
out dx,al
F1quit:
popa
jmp noint
egaF2: ;--- Read a register range ---------------------------------------------
pusha
cmp dx,0
jne F28
F20:
lea si,ega_current_crtc ; get the address of this buffer
mov dx,cx ; save this value
xchg ch,cl ; create an index with CH
and cx,0ffh ; only need CH (now CL)
add si,cx ; SOURCE adjust the address
xor dh,dh ; only want the old CL value
mov cx,dx ; restore CX
mov di,bx ; DESTINATION got from the application
rep movsb ; copy to the app's register block
popa
jmp noint
F28:
cmp dx,8
jne F210
lea si,ega_current_seq ; get the address of this buffer
mov dx,cx ; save this value
xchg ch,cl ; create an index with CH
and cx,0ffh ; only need CH (now CL)
dec cx ; RESET is not stored, so index-1
add si,cx ; SOURCE adjust the address
xor dh,dh ; only want the old CL value
mov cx,dx ; restore CX
mov di,bx ; DESTINATION got from the application
rep movsb ; copy to the app's register block
popa
jmp noint
F210:
cmp dx,010h
jne F218
lea si,ega_current_graph ; get the address of this buffer
mov dx,cx ; save this value
xchg ch,cl ; create an index with CH
and cx,0ffh ; only need CH (now CL)
add si,cx ; SOURCE adjust the address
xor dh,dh ; only want the old CL value
mov cx,dx ; restore CX
mov di,bx ; DESTINATION got from the application
rep movsb ; copy to the app's register block
popa
jmp noint
F218:
cmp dx,018h
jne F2quit
lea si,ega_current_attr ; get the address of this buffer
mov dx,cx ; save this value
xchg ch,cl ; create an index with CH
and cx,0ffh ; only need CH (now CL)
add si,cx ; SOURCE adjust the address
xor dh,dh ; only want the old CL value
mov cx,dx ; restore CX
mov di,bx ; DESTINATION got from the application
rep movsb ; copy the application's register block
F2quit:
popa
jmp noint
egaF3: ;--- Write a register range to the EGA adapter ------------------------
pusha
push ds
push es
F31:
cmp dx,0
jne F38
lea di,ega_current_crtc ; write the application data here
mov al,ch ; adjust the write position as required
cbw
add di,ax ; DESTINATION specified address
mov si,bx ; SOURCE from the application
lea bx,dirty_crtc ; need to write some data into here
add bx,ax ; well, at this offset anyway
mov ax,es ; The application is the source
mov ds,ax ; so point to its segment
mov dx,03d4h ; CRTC index register
mov ah,ch ; CRTC register to start at
xor ch,ch ; CX is now the loop counter
assume ds:nothing
F31cp:
mov byte ptr cs:[bx],1 ; fill in the dirty_crtc array
inc bx
movsb ; get the value from the app to write
; and write to the internal buffer
out dx,ax ; write to the EGA adapter
loop F31cp
jmp F3quit
F38:
cmp dx,8
jne F310
lea di,ega_current_seq ; write the application data here
mov al,ch ; adjust the write position as required
cbw
add di,ax ; DESTINATION specified address
dec di ; RESET is not stored, so index-1
mov si,bx ; SOURCE from the application
lea bx,dirty_seq ; need to write some data into here
add bx,ax ; well, at this offset anyway
inc bx
mov ax,es ; The application is the source
mov ds,ax ; so point to its segment
mov dx,03c4h ; Sequencer index register
mov ah,ch ; Sequencer register to start at
inc ah
xor ch,ch ; CX is now the loop counter
assume ds:nothing
F38cp:
mov byte ptr cs:[bx],1 ; fill in the dirty_seq array
inc bx
movsb ; get the value from the app to write
; and write to the internal buffer
out dx,ax ; write to the EGA adapter
loop F38cp
assume ds:SpcMseSeg
jmp F3quit
F310:
cmp dx,010h
jne F318
lea di,ega_current_graph ; write the application data here
mov al,ch ; adjust the write position as required
cbw
add di,ax ; DESTINATION specified address
mov si,bx ; SOURCE from the application
lea bx,dirty_graph ; need to write some data into here
add bx,ax ; well, at this offset anyway
mov ax,es ; The application is the source
mov ds,ax ; so point to its segment
mov dx,03ceh ; Graphics Controller index register
mov ah,ch ; GC register to start at
xor ch,ch ; CX is now the loop counter
assume ds:nothing
F310cp:
mov byte ptr cs:[bx],1 ; fill in the dirty_graph array
inc bx
movsb ; get the value from the app to write
; and write to the internal buffer
out dx,ax ; write to the EGA adapter
loop F310cp
assume ds:SpcMseSeg
jmp short F3quit
F318:
cmp dx,018h
jne F3quit
mov dx,03dah ; clear attribute controller index
in al,dx ; the read clears this register
lea di,ega_current_attr ; write the application data here
mov al,ch ; adjust the write position as required
cbw
add di,ax ; DESTINATION specified address
mov si,bx ; SOURCE from the application
lea bx,dirty_attr ; need to write some data into here
add bx,ax ; well, at this offset anyway
mov ax,es ; The application is the source
mov ds,ax ; so point to its segment
mov dx,03c0h ; Attribute Controller index register
mov ah,ch ; AC register to start at
xor ch,ch ; CX is now the loop counter
assume ds:nothing
F318cp:
mov byte ptr cs:[bx],1 ; fill in the dirty_attr array
inc bx
movsb ; get the value from the app to write
; and write to the internal buffer
out dx,ax ; write to the EGA adapter
loop F318cp
assume ds:SpcMseSeg
F3quit:
pop es
pop ds
popa
jmp noint
egaF4: ;--- Read EGA register set -------------------------------------------
;
; note that the incoming/outgoing data is structured thus:
;
; from application --> db Port number
; --> db must be zero
; --> db pointer value
; to application <-- db data read from register
pusha
F4lp:
mov al,byte ptr es:[bx] ; get the type of the next EGA register
mov dl,byte ptr es:[bx+2] ; load up the offset required
xor dh,dh ; convert DL to a word (DX)
add bx,3 ; point to where the data should
; be written for the application
F40:
cmp al,0
jne F48
lea di,ega_current_crtc ; point to the internal CRTC reg. buffer
add di,dx ; index into the buffer
mov al,byte ptr [di] ; get the register value from the driver
mov byte ptr es:[bx],al ; store the register value
jmp short F4lp2 ; do the next loop iteration
F48:
cmp al,8
jne F410
lea di,ega_current_seq ; point to the internal Sequencer buffer
add di,dx ; index into the buffer
dec di ; RESET is not stored, so index off 1
mov al,byte ptr [di] ; get the register value from the driver
mov byte ptr es:[bx],al ; store the register value
jmp short F4lp2 ; do the next loop iteration
F410:
cmp al,010h
jne F418
lea di,ega_current_graph ; point to the internal GC reg. buffer
add di,dx ; index into the buffer
mov al,byte ptr [di] ; get the register value from the driver
mov byte ptr es:[bx],al ; store the register value
jmp short F4lp2 ; do the next loop iteration
F418:
cmp al,018h
jne F420
lea di,ega_current_attr ; point to the interal AC reg. buffer
add di,dx ; index into the buffer
mov al,byte ptr [di] ; get the register value from the driver
mov byte ptr es:[bx],al ; store the register value
jmp short F4lp2 ; do the next loop iteration
F420:
cmp al,020h
jne F4lp2
mov al,[ega_current_misc] ; load contents of miscellaneous reg
mov byte ptr[di],al ; store the register value
; the C code actually loads BL here but I don't know why!
F4lp2:
inc bx ; point to the next 'record'
loop F4lp
popa
jmp noint
egaF5: ;--- Write EGA register set -------------------------------------------
;
; note that the incoming data is structured thus:
;
; from application --> db Port number
; --> db must be zero
; --> db pointer value
; --> db data read from register
pusha
F5lp:
mov al,byte ptr es:[bx] ; get the type of the next EGA register
mov dl,byte ptr es:[bx+2] ; load up the offset required
xor dh,dh ; turn from 8 bit to a word quantity
mov si,dx ; need this when accessing buffers
add bx,3 ; point to where the data should
; be written for the application
mov ah,byte ptr es:[bx] ; load data to send to the port
inc bx ; point to the next 'record'
F50:
cmp al,0
jne F58
mov al,dl ; also the port offset to access
mov dx,03d4h ; index register for CRTC
out dx,ax ; write to the specified port
mov byte ptr [ega_current_crtc+si],ah
mov byte ptr [dirty_crtc+si],1
jmp short F5lp2
F58:
cmp al,8
jne F510
mov al,dl ; also the port offset to access
mov dx,03c4h ; index register for Sequencer
out dx,ax ; write to the specified port
dec si ; RESET is not stored, so index off 1
mov byte ptr [ega_current_seq+si],ah
mov byte ptr [dirty_seq+si],1
jmp short F5lp2
F510:
cmp al,010h
jne F518
mov al,dl ; also the port offset to access
mov dx,03ceh ; index register for GC
out dx,ax ; write to the specified port
mov byte ptr [ega_current_graph+si],ah
mov byte ptr [dirty_graph+si],1
jmp short F5lp2
F518:
cmp al,018h
jne F520
mov dx,03dah ; clear attribute controller index
in al,dx ; the read clears this register
lea di,ega_current_attr ; write the application data here
mov al,dl ; also the port offset to access
mov dx,03c0h ; index register for AC
out dx,ax ; write to the specified port
mov al,020h ; EGA palette enable
out dx,al ; reenable the video
mov byte ptr [ega_current_attr+si],ah
mov byte ptr [dirty_attr+si],1
jmp short F5lp2
F520:
cmp al,020h
jne F528
mov byte ptr [ega_current_misc],ah
mov dx,03c2h ; Miscellaneous output register
xchg ah,al
out dx,al ; write one byte
jmp short F5lp2
F528:
xchg ah,al
mov dx,03dah ; EGA feature register
out dx,al
F5lp2:
dec cx
cmp cx,0
jz F5quit
jmp F5lp
F5quit:
popa
jmp noint
egaF6: ;--- Restore the EGA default register values --------------------------
pusha
push es
; copy the default EGA register sets to the driver's internal cache
mov ax,ds
mov es,ax
mov cx,25
lea di,ega_current_crtc
lea si,ega_default_crtc
rep movsb
mov cx,4
lea di,ega_current_seq
lea si,ega_default_seq
rep movsb
mov cx,9
lea di,ega_current_graph
lea si,ega_default_graph
rep movsb
mov cx,20
lea di,ega_current_attr
lea si,ega_default_attr
rep movsb
mov al,[ega_default_misc]
mov [ega_current_misc],al
; Set up the Sequencer defaults
mov dx,03c4h ; Sequencer index register
mov ax,0100h ; Synchronous reset
out dx,ax ; do the work
xor bx,bx ; do the four non reset registers
inc al ; point to the next Sequencer register
F6lp1:
cmp [dirty_seq+bx],1 ; has the dirty bit been set?
jne F6ne1
mov ah,[ega_default_seq+bx] ; default value to send to the register
out dx,ax ; do the work
F6ne1:
inc bx ; point to the next buffer location
inc al ; point to the next Sequencer register
cmp bx,3 ; copy elements 0->3 to ports
jl F6lp1
mov ax,0300h ; Clear synchronous reset
out dx,ax ; do the work
; Set up the default Miscellaneous Output Register value.
mov dx,03c2h ; Miscellaneous o/p register address
mov al,[ega_default_misc] ; the default value
out dx,al ; write to the EGA/VGA
; Set up the Cathode Ray Tube Controller in the default fashion
mov dx,03d4h ; Index to the CRTC
xor bx,bx ; clear an index register
F6lp2:
cmp [dirty_crtc+bx],1 ; has the dirty bit been set?
jne F6ne2
mov ax,bx ; index for the CRTC index register
mov ah,[ega_default_crtc+bx] ; default value for the selected reg.
out dx,ax
F6ne2:
inc bx ; point to the next location
cmp bx,25 ; 25 registers to copy
jl F6lp2
; Set up the Attribute Controller default values
; Remember that this is a funny beast which uses a flip-flop
; off just one address/data port
mov dx,03dah ; CRT status register
in al,dx ; set the AC flip-flop
mov dx,03c0h ; Attibute controller address/data regs
xor bx,bx ; clear an index register
F6lp3:
cmp [dirty_attr+bx],1 ; has the dirty bit been set?
jne F6ne3
mov ax,bx ; index for the CRTC index register
mov ah,[ega_default_attr+bx] ; default value for the selected reg.
out dx,al ; index the register, then flip the flop
xchg al,ah ; get the default data for this register
out dx,al ; write the data out
F6ne3:
inc bx ; point to the next location
cmp bx,20 ; 20 registers to copy
; Set the Graphics Controller default values
mov dx,03ceh ; Index to the GC
xor bx,bx ; clear an index register
F6lp4:
cmp [dirty_graph+bx],1 ; has the dirty bit been set?
jne F6ne4
mov ax,bx ; index for the GC index register
mov ah,[ega_default_graph+bx] ; default value for the selected reg.
out dx,ax
F6ne4:
inc bx ; point to the next location
cmp bx,9 ; 9 registers to copy
jl F6lp2
; Reenable the video
mov dx,03c0h ; index register for AC
mov al,020h ; EGA palette enable
out dx,al ; reenable the video
; Clean out the dirty register arrays
xor al,al ; put a nice zero in all the dirty
; registers
mov cx,25+4+9+20 ; do the CRTC, SEQ, GC and AC in
mov di,offset dirty_crtc ; one go
rep stosb
pop es
popa
jmp noint
egaF7: ;---Define default register table -------------------------------------
pusha
push es
push ds
; Load a new set of default registers for a particular EGA/VGA component
mov si,bx ; SOURCE of the incoming data from the app
mov ax,es ; save the SOURCE segment register
mov bx,ds ; save the DESTINATION offset
mov ds,ax ; DS is now the SOURCE segment in the app
mov es,bx ; ES is now the DESTINATION segment in the dvr
assume ds:nothing, es:SpcMseSeg
F70: ; Set the default CRTC registers
cmp dx,0
jne F78
mov cx,25 ; copy 25 register entries
mov di,offset ega_default_crtc
rep movsb ; do the copy
jmp short F7dirty
F78: ; Set the default Sequencer registers
cmp dx,8
jne F710
mov cx,4 ; copy 4 register entries
mov di,offset ega_default_seq
rep movsb ; do the copy
jmp short F7dirty
F710: ; Set the default Graphic Controller registers
cmp dx,10
jne F718
mov cx,9 ; copy 9 register entries
mov di,offset ega_default_graph
rep movsb ; do the copy
jmp short F7dirty
F718: ; Set the default Attribute Controller registers
cmp dx,18
jne F720
mov cx,20 ; copy 20 register entries
mov di,offset ega_default_attr
rep movsb ; do the copy
jmp short F7dirty
F720: ; Set the default Miscellaneous Output register
cmp dx,20
jne F7quit
mov word ptr cs:[ega_default_misc],si
F7dirty:
; Set all the dirty register arrays
mov al,1 ; put a nice one in all the dirty
; registers
mov cx,25+4+9+20 ; dirty all the registers in one go
mov di,offset dirty_crtc
rep stosb
F7quit:
pop ds ; need to restore the segment registers
pop es
assume ds:SpcMseSeg, es:nothing
popa
jmp noint
egaFA: ;--- Interrogate driver -----------------------------------------------
; The real Microsoft mouse driver gets this wrong (release 7.03)
push ax
mov ax,cs
mov es,ax
mov bx,offset relnum ; return the address of the mouse
; driver version number
pop ax
jmp noint
;=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
ENDIF ; MOUSE_VIDEO_BIOS
do_bop:
bop VIDEO_IO_BOP ;BOP BE
nop
nop
jnc noint
go_rom:
popf
db 0EAh ; this is a far jump
old_vid_int dd ? ; far pointer to the old int 10h vector
jmp DOIRET
noint:
popf
jmp DOIRET
mouse_int1:
bop INT1_BOP
jmp DOIRET
mouse_version:
dw 04242h
dw 0000h
mouse_copyright:
db "Windows NT MS-DOS subsystem Mouse Driver"
video_io:
int VIDEO
bop UNSIMULATE_BOP
mouse_int2:
bop INT2_BOP
jmp DOIRET
mouseINB:
in al,dx
bop 0feh
mouseOUTB:
out dx,al
bop 0feh
mouseOUTW:
out dx,ax
bop 0feh
;+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;
;16 BIT ENTRY POINT 16 BIT ENTRY POINT 16 BIT ENTRY POINT 16 BIT ENTRY POINT
;
;+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================
; Procedure that provides the driver interface to 32 bit land. This is
; the entry point to the Intel 16 bit driver from the mouse interrupt
; handler in the host mouse code.
;
; This procedure determines the current video mode from the BIOS data
; area, and depending on this branches to the correct display routines
; for this mode.
;
; N.B. This function MUST NOT modify CX and DX because the next level
; of functions in the driver heirarchy requires the values passed in
; them from 32 bit land.
;========================================================================
assume ds:SpcMseSeg
entry_point_from_32bit proc near
make_stack ; use the driver's own stack
push ds
push ax
push bx
mov ax,cs
mov ds,ax
call getBIOSvideomode; read the BIOS data area
xor bx,bx ; clear the jump table index
shl al,1 ; create a table index for word sized entries
mov bl,al ; move into a base register
call [drawpointerJMPT+bx] ; jump to the correct routine
pop bx
pop ax
pop ds
kill_stack ; return to the previous stack
bop 0FEh ; return to the 32 bit side
entry_point_from_32bit endp
;========================================================================
; Procedure to set the cursor draw flag to DO DRAW. This is called from
; SoftPC code via a host_simulate(). This routine is called when the
; application does an INT 33h, function 1.
;
; In accordance with the Microsoft Programmer's Reference, the internal
; cursor flag (internalCF) has a default value of -1. If intenalCF = 0
; then the cursor is drawn. If the flag is already 0, then this function
; does nothing.
;
; Note: with calls to int 33h AX = 2, it is legal to
; make internalCF less than -1.
;========================================================================
int33function1 proc near
make_stack ; use the driver's own stack
push ax
push bx
push ds
mov ax,cs
mov ds,ax
;; do not allow mouse int comes in while we are updating the cursor.
;; call DOCLI
; check to see if the pointer should be drawn
; cmp [internalCF],0 ; is the flag already zero?
; jz fn1quit ; if so, do nothing
; pointer is not ON, so increment the flag to try to turn it ON
; inc [internalCF] ; increment the pointer internal flag
; cmp [internalCF],0 ; if 0, then the pointer can be drawn
; jl fn1quit ; it is < 0, so don't draw the pointer.
; The internal cursor flag hits zero for the first time, so
; draw the pointer.
call getBIOSvideomode; read the BIOS data area
xor bx,bx ; clear the jump table index
shl al,1 ; create a table index for word sized entries
mov bl,al ; move into a base register
call [Int33function1JMPT+bx] ; do the correct function 1 handler
fn1quit:
;; call DOSTI
pop ds
pop bx
pop ax
kill_stack ; return to the previous stack
bop 0FEh ; back to jolly old 32 bit land
int33function1 endp
;========================================================================
; Procedure to set the cursor draw flag to DONT DRAW. This is called from
; SoftPC code via a host_simulate(). This routine is called when the
; application does an INT 33h, function 2
;
; Note: with calls to int 33h AX = 2, it is legal to
; make internalCF less than -1.
;========================================================================
int33function2 proc near
make_stack ; use the driver's own stack
push ax
push bx
push ds
mov ax,cs
mov ds,ax
;; do not allow mouse int comes in while we are updating the cursor.
;; call DOCLI
; dec [internalCF] ; decrement the pointer internal flag
; if the internal cursor flag is less than -1, then do not try
; do remove the pointer from the screen because this has already
; been done.
; cmp [internalCF],0ffh
; jl fn2quit ; do nothing if < -1
; Internal flag hits -1, so remove the pointer from the screen.
call getBIOSvideomode; read the BIOS data area
xor bx,bx ; clear the jump table index
shl al,1 ; create a table index for word sized entries
mov bl,al ; move into a base register
call [Int33function2JMPT+bx] ; do the correct function 1 handler
fn2quit:
;; call DOSTI
pop ds
pop bx
pop ax
kill_stack ; return to the previous stack
bop 0feh
int33function2 endp
;========================================================================
; Procedure to return straight back to cloud 32. This is needed if an
; unsupported video mode is found in the BIOS data area.
;========================================================================
not_supported proc near
ret ; cant't BOP 0feh here or the stack will die
; (out of balance with CS:IP stored from call)
not_supported endp
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;
; END 16 BIT ENTRY END 16 BIT ENTRY END 16 BIT ENTRY END 16 BIT ENTRY
;
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================
; Procedure to draw a cursor on the fullscreen X86 graphics display for
; high resolution graphics modes.
; This procedure saves the area about to be written over, blts the
; pointer image onto the screen and restores the background from whence
; cursor has just come.
;
; Input: CX = x-coordinate
; DX = y-coordinate
; Output: None
;========================================================================
drawHiResPointer proc near
; save the video card's read/write context
;; call DOCLI
pusha
push ds
mov ax,cs ; make sure that DS points to the
mov ds,ax ; right segment
call saveVGAregisters
call check_for_mode_change
mov bx,cx ; get X coordinate into a base register
shl bx,1 ; calculate a word index
mov ax,[ChooseImageLUT+bx] ; select the right image LUT
mov [PointerLUT],ax ; store the LUT address
xor ax,ax ; assume carry clear after the next call
call determineboundary
jnc detcont ; pointer in buonds if carry clear
not ax ; carry was set, so set AX non zero
detcont:
; Coordinates are now transformed from Cartesian to physical VRAM
; memory byte and bit offsets.
mov di,dx ; store DX for later
; internalCF = the current pointer status
; background = indicates if a background has been stored or not
;
; if(internalCF == Zero && background == STORED)
; The normal cursor ON condition
cmp [internalCF],0
jnz end_the_if ; request to turn pointer on
cmp [background],STORED
jne end_the_if
mov si,cx
mov di,dx
mov dx,[VRAMlastbyteoff]
mov cx,[VRAMlastbitoff]
call restore_background
cmp ax,0 ; should the pointer be drawn?
jnz end_the_if ; if the pointer has gone off the edge of
; the screen, then quit
mov [VRAMlastbyteoff],di ; save the current position
mov [VRAMlastbitoff],si
mov cx,si
mov dx,di
call save_background
mov cx,si
mov dx,di
call drawEGApointer
end_the_if:
call restoreVGAregisters
pop ds
popa
;; call DOSTI
ret
drawHiResPointer endp
;========================================================================
; Procedure to draw a cursor on the fullscreen X86 graphics display.for
; medium resolution graphics modes.
; This procedure saves the area about to be written over, blts the
; pointer image onto the screen and restores the background from whence
; cursor has just come.
;
; Input: CX = x-coordinate
; DX = y-coordinate
; Output: None
;========================================================================
drawMediumResPointer proc near
pusha
;; call DOCLI
shr cx,1 ; map from 640 virtual to 320 real
; CX,DX = x,y cartesian coordinates here.
call check_for_mode_change
; internalCF = the current pointer status
; background = indicates if a background has been stored or not
;
; if(internalCF == Zero && background == STORED)
; The normal cursor ON condition
cmp [internalCF],0
jnz cant_draw_ptr ; request to turn pointer on
cmp [background],STORED
jne cant_draw_ptr
mov si, cx ; save new cursor position
mov di, dx
mov dx,[VRAMlastbyteoff] ;
mov cx,[VRAMlastbitoff]
mov bp,[LastYCounters] ; Y looping counter
call restorebkgrndmode4
mov cx, si ; restore new cursor position
mov dx, di
call detboundmode4 ; calculate new byte offset
jc cant_draw_ptr ; don't draw new cursor of out of scrn
mov [VRAMlastbyteoff], dx ; byte offset
mov [VRAMlastbitoff], cx ; MSB = 0FFh if start with ODD line
; LSB = bit offset
mov [LastYCounters], bp ; MSB: even counter, LSB for odd
call savebkgrndmode4
call drawmode4pointer
cant_draw_ptr:
;; call DOSTI
popa
ret
drawMediumResPointer endp
;========================================================================
; Procedure to draw a cursor on the fullscreen X86 graphics display for
; medium resolution, 256 colour graphics mode. (video bios mode 13h).
; This procedure saves the area about to be written over, blts the
; pointer image onto the screen and restores the background from whence
; cursor has just come.
;
; Input: CX = x-coordinate
; DX = y-coordinate
; Output: None
;========================================================================
drawC256Pointer proc near
pusha
;; call DOCLI
shr cx,1 ; map from 640 virtual to 320 real x
; CX,DX = x,y cartesian coordinates here.
call check_for_mode_change
; internalCF = the current pointer status
; background = indicates if a background has been stored or not
;
; if(internalCF == Zero && background == STORED)
; The normal cursor ON condition
cmp [internalCF],0
jnz cant_draw_256ptr ; request to turn pointer on
cmp [background],STORED
jne cant_draw_256ptr
mov si,cx
mov di,dx
mov dx,[VRAMlastbyteoff]
mov cx,[LastXCounters]
mov bp,[LastYCounters]
call restorebkgrndmode13
mov cx, si
mov dx, di
call detboundmode13
jc cant_draw_256ptr
mov [VRAMlastbyteoff],dx ; save the current position
mov [LastXCounters],cx
mov [LastYCounters], bp
call savebkgrndmode13
call draw256pointer
cant_draw_256ptr:
;; call DOSTI
popa
ret
drawC256Pointer endp
;========================================================================
; Procedure to draw a pointer on the fullscreen X86 text display for
; BIOS modes 3 and 7.
; This procedure saves the area about to be written over, XORs the
; pointer image onto the screen and restores the background from whence
; cursor has just come.
;
; Input: CX = x-coordinate
; DX = y-coordinate
; Output: None
;========================================================================
IFDEF SIXTEENBIT
drawTextPointer proc near
pusha
push es
; CX,DX = x,y virtual pixel coordinates here.
; 0 <= x < 640
; 0 <= y < 200 for 25 line mode
; 0 <= y < 344 for 43 line mode
; 0 <= y < 400 for 50 line mode
; The virtual character size is always 8x8 virtual pixels.
call check_for_mode_change
; internalCF = the current pointer status
; background = indicates if a background has been stored or not
;
; if(internalCF == Zero && background == STORED)
; The normal cursor ON condition
cmp [internalCF],0
jnz cant_draw_text_ptr ; request to turn pointer on
cmp [background],STORED
jne cant_draw_text_ptr
; Calculate the current cell location as an offset
; into the text buffer segment starting at B800:0
; Note: The following kinky shifts allow for the fact that the text
; video buffer consists of word elements of the form char:attr.
; So, if a row = 80 characters wide on the screen, it is 160
; bytes wide in VRAM.
mov bx,dx ; create a word table index
shr bx,3 ; virtual char height = 8, but 160 bytes
; per text row, so save some shifts.
shl bx,1 ; make a word table index
mov di,[mult80lut+bx] ; multiply by 80 words per text row.
shl di,1
shr cx,3 ; divide the x virtual pixel coordinate
; by 8 = virtual char width and mult
; by 2 to get word offset in text row.
shl cx,1
add di,cx ; full VRAM location now in DI
; Restore the text cell previously overwritten.
mov si,[VRAMlasttextcelloff]; address of last modified text cell
mov [VRAMlasttextcelloff],di; store the current cell location
mov ax,0b800h ; the text buffer segment
mov es,ax ; ES now points there
; The text pointer uses the same magic as the graphics code
; to place a pointer on the screen.
mov bx,07700h ; the magic cursor mask for pointer
mov cx,077ffh ; the magic screen mask for pointer
assume es:nothing
mov ax,[lasttextimage] ; restore the background
mov es:[si],ax ; from last time
mov ax,es:[di] ; load the cell to be modifyed
mov [lasttextimage],ax ; save this cell for next time
and ax,cx ; apply the screen mask
xor ax,bx ; apply the cursor mask
mov es:[di],ax ; and write back
assume es:SpcMseSeg
cant_draw_text_ptr:
pop es
popa
ret
drawTextPointer endp
ENDIF ;; SIXTEENBIT
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;
; Interrupt 33h support functions.
; These functions are called via a jump table from the 16 bit entry
; point code.
;
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================
; Procedure to set the cursor draw flag to DO DRAW. This is called from
; SoftPC code via a host_simulate(). This routine is called when the
; application does an INT 33h, function 1
;========================================================================
int33function0 proc near
make_stack ; use the driver's own stack
push ds
push es
pusha
; sort out the segments
mov ax,cs
mov ds,ax
mov ax,cs
mov es,ax
;; do not allow mouse int comes in while we are updating the cursor.
;; call DOCLI
; set the internal pointer flag to its default value.
mov [internalCF],0ffh
; set the default hotspot location = (0,0)
xor ax,ax
mov [hotspot],ax
mov [hotspot+2],ax
; copy the default pointer to the working pointer buffer
lea si,default_cursor
lea di,current_cursor
call copy_pointer_to_current
; clear the pointer enabled flag, turn the pointer off by restoring
; the background.
mov [background],NOTSTORED ; there is no stored background now
;; call DOSTI
popa
pop es
pop ds
kill_stack ; restore the previous stack
bop 0FEh
int33function0 endp
;========================================================================
; Procedure to accept a cursor bit image from the current application
; at ES:DX. This is stored as the current pointer image for use by
; the driver.
;========================================================================
assume es:nothing
int33function9 proc near
call DOCLI
make_stack ; use the driver's own stack
push ds
push es
pusha
mov ax,cs ; point at the driver data segment
mov ds,ax
;; do not allow mouse int comes in while we are updating the cursor.
;; call DOCLI
; Read in the hotspot cartesian coordinate values for the
; new pointer image. If the hotspot values are out of range
; i.e. >127 | < -128, then reset to the boundary value
; Now using kinky non modRM short forms by clever use of AX
mov ax,127 ; load accumulator with 127
mov bp,ax ; store this constant in a register
cmp ax,bx ; compare X value of hotspot with 127
jg test_low_x ; if 127 > BX, BX is within upper limit
xchg ax,bx ; BX > 127, so set to 127
jmp short check_y_hotspot ; now test the Y values
test_low_x:
not ax ; change accumulator from 127 to -128
cmp ax,bx ; compare X value of hotspot with -128
jl check_y_hotspot ; if -128 < BX, BX is within lower lim.
xchg ax,bx ; BX < -128, so set it to -128
check_y_hotspot:
mov ax,bp ; reload AX with 127
cmp ax,cx ; compare Y value of hotspot with 127
jg test_low_y ; if 127 > CX, Cx is within upper limit
xchg ax,cx ; CX > 127, so set CX to 127
jmp short done_hotspot_check; both hotspot coords tested, so save
test_low_y:
not ax ; change accumulator from 127 to -128
cmp ax,cx ; compare Y value of hotspot with -128
jl done_hotspot_check ; if -128 < CX, CX is within lower lim.
xchg ax,cx ; CX < -128, so set it to -128
done_hotspot_check:
mov [hotspot],bx ; save the hotspot x,y
mov [hotspot+2],cx ; y component of the hotspot
; DESTINATION: the driver current pointer buffer
; Note: the SOURCE is already being pointed at by DX
lea di,current_cursor ; this is the bit that must change
mov si,dx
; copy in the new application pointer
mov ax,es
mov ds,ax ; DS now points to where ES points
mov ax,cs
mov ax,es ; ES points to our data area now
call copy_pointer_to_current ; Copy the pointer image appropriately
popa
pop es
pop ds
kill_stack ; restore the previous stack
call DOSTI
ret ; this code is called from within this
; 16 bit driver, so don't BOP
int33function9 endp
;============================================================================
; Procedure to display the pointer image in HIRES graphics modes
;============================================================================
HiResInt33Function1 proc near
pusha
call check_for_mode_change
call saveVGAregisters
mov cx,[current_position_x] ; get the last known cursor position
mov dx,[current_position_y] ; from the OS via the event loop
call determineboundary ; convert to VRAM coordinates
jc end_function1 ; if the pointer has gone off the edge
; of the screen, then quit
mov [VRAMlastbyteoff],dx ; save the restore background location
mov [VRAMlastbitoff],cx
mov si,cx
mov di,dx
call save_background
mov cx,si
mov dx,di
call drawEGApointer
mov [background],STORED
end_function1:
call restoreVGAregisters
popa
ret ; return to driver surface manager code
HiResInt33Function1 endp
;============================================================================
; Procedure to display the pointer image in MEDIUMRES graphics modes
; Note that this function does a conversion from virtual pixel coordinates
; to real screen coordinates as required if the stored values in the
; current_position memory locations are greater than 320 for X or 200
; for Y.
;============================================================================
MediumResInt33Function1 proc near
pusha
call check_for_mode_change
mov cx,[current_position_x] ; get the last known cursor position
mov dx,[current_position_y] ; from the OS via the event loop
shr cx,1 ; virtual coor -> screen coor
call detboundmode4 ; convert to VRAM coordinates
jc MediumResFunction1_exit
mov [VRAMlastbyteoff],dx ; save the restore background location
mov [VRAMlastbitoff],cx
mov [LastYCounters], bp
call savebkgrndmode4
call drawmode4pointer
mov [background],STORED
MediumResFunction1_exit:
popa
ret
MediumResInt33Function1 endp
;============================================================================
; Procedure to display the pointer image in VGA 256 colour graphics modes
;============================================================================
C256Int33Function1 proc near
pusha
call check_for_mode_change
call modifyentry255 ; make sure that DAC entry 255 is white
mov cx,[current_position_x] ; get the last known cursor position
mov dx,[current_position_y]
shr cx, 1 ; virtual coor -> screen coord
call detboundmode13 ; convert to VRAM coordinates
jc C256Function1_exit
mov [VRAMlastbyteoff],dx ; save the restore background location
mov [LastXCounters],cx ; X loop counter
mov [LastYCounters], bp ; Y loop counter
call savebkgrndmode13
call draw256pointer
mov [background],STORED
C256Function1_exit:
popa
ret ; return to driver surface manager code
C256Int33Function1 endp
;============================================================================
; Procedure to show the TEXT pointer
;============================================================================
IFDEF SIXTEENBIT
TextInt33Function1 proc near
pusha
push es
mov [background],STORED
call check_for_mode_change
mov cx,[current_position_x] ; get the last known cursor position
mov bx,[current_position_y] ; from the OS via the event loop
shr bx,3 ; virtual char height = 8, but 160 bytes
; per text row.
shl bx,1 ; make a word table index
mov di,[mult80lut+bx] ; multiply by 80 words per text row.
shl di,1 ; remember 160 bytes NOT 80 in a row
shr cx,3 ; divide the x virtual pixel coordinate
; by 8 = virtual char width and mult
; by 2 to get word offset in text row.
shl cx,1
add di,cx ; full VRAM location now in DI
mov [VRAMlasttextcelloff],di; store the current cell location
mov ax,0b800h ; the text buffer segment
mov es,ax ; DS now points there
mov bx,07700h ; the magic cursor mask for pointer
mov cx,077ffh ; the magic screen mask for pointer
assume es:nothing
mov ax,es:[di] ; load the cell to be modifyed
mov [lasttextimage],ax ; save this cell for next time
and ax,cx ; apply the screen mask
xor ax,bx ; apply the cursor mask
mov es:[di],ax ; and write back
assume es:SpcMseSeg
pop es
popa
ret ; return to driver surface manager code
TextInt33Function1 endp
ENDIF ;; SIXTEENBIT
;============================================================================
; Procedure to remove the pointer image in HIRES graphics modes
;============================================================================
HiResInt33Function2 proc near
push cx
push dx
call saveVGAregisters
call check_for_mode_change
cmp [background],STORED ; is there some stored background?
jne no_background_stored ; no, so don't restore it
mov dx,[VRAMlastbyteoff]
mov cx,[VRAMlastbitoff]
call restore_background ; restored the background at correct
mov [background],NOTSTORED ; place. Set buffer cleared Flag
no_background_stored:
call restoreVGAregisters
pop dx
pop cx
ret
HiResInt33Function2 endp
;============================================================================
; Procedure to remove the pointer image in MEDIUMRES graphics modes
;============================================================================
MediumResInt33Function2 proc near
push cx
push dx
push bp
call check_for_mode_change
cmp [background],STORED ; is there some stored background?
jne nobkgrndstored ; no, so don't restore it
mov dx,[VRAMlastbyteoff]
cmp dx,80*100 ; mustn't be greater than buffer size
jl vidoffok ; it's OK, so do nothing
mov dx,80*10-1 ; modify DX to fit in the buffer
vidoffok:
mov cx,[VRAMlastbitoff] ; CL = bit offset
; CH = odd/even flag
and cl,3 ; cannot be greater than bit 3( 2bits/p)
mov bp, [LastYCounters]
call restorebkgrndmode4 ; restored the background at correct
mov [background],NOTSTORED ; place. Set buffer cleared Flag
nobkgrndstored:
pop bp
pop dx
pop cx
ret
MediumResInt33Function2 endp
;============================================================================
; Procedure to remove the pointer image in MEDIUMRES graphics modes
;============================================================================
C256Int33Function2 proc near
push cx
push dx
push bp
call check_for_mode_change
cmp [background],STORED ; is there some stored background?
jne nobkgrndstored256 ; no, so don't restore it
mov dx,[VRAMlastbyteoff]
mov cx,[LastXCounters]
mov bp,[LastYCounters]
call restorebkgrndmode13 ; restored the background at correct
mov [background],NOTSTORED ; place. Set buffer cleared Flag
nobkgrndstored256:
pop bp
pop dx
pop cx
ret
C256Int33Function2 endp
;============================================================================
; Procedure to remove the pointer image in TEXT modes
;============================================================================
IFDEF SIXTEENBIT
TextInt33Function2 proc near
push ax
push si
push es
call check_for_mode_change
cmp [background],STORED ; is there some stored background?
jne no_text_background_stored ; no, so don't restore it
mov [background],NOTSTORED ; place. Set buffer cleared Flag
; Restore the text cell previously overwritten.
mov si,[VRAMlasttextcelloff]; address of last modified text cell
mov ax,0b800h ; the text buffer segment
mov es,ax ; DS now points there
assume es:nothing
mov ax,[lasttextimage] ; restore the background
mov es:[si],ax ; from last time
no_text_background_stored:
assume es:SpcMseSeg
pop es
pop si
pop ax
ret
TextInt33Function2 endp
ENDIF ;; SIXTEENBIT
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;
; End of Interrupt 33h support functions.
;
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;
; Mouse driver general support functions
;
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================
; Procedure to determine if the application has changed video modes since
; the last mouse interrupt. If it has, then the image that is saved in the
; background restore buffer is invalid and should not be drawn.
;========================================================================
check_for_mode_change proc near
push ax
call getBIOSvideomode; peek at the BIOS data area for video mode
cmp al,[lastvidmode]; compare with the last mode value
; from the preceding interrupt
jnz mode_change ; a mode change has occurred
pop ax ; no mode change, so quit
ret
mode_change:
mov [background],NOTSTORED
mov byte ptr [lastvidmode],al ; store the new mode
pop ax
ret
check_for_mode_change endp
;========================================================================
; Procedure to read the BIOS data area and get the current video mode
; Output: AL = BIOS video mode
; Modifies: memory variable -> currentvidmode, puts the video found in
; the BIOS data area in this memory location.
;========================================================================
getBIOSvideomode proc near
push es
push bx
mov ax,40h ; BIOS data area segment
mov es,ax
mov al,es:[49h] ; get the BIOS video mode data
mov bl,al ; copy the video mode value
xor bh,bh
shl bx,1 ; create a word table index
mov bx,[latchhomeLUT+bx] ; get the latch hiding place for this
; video mode
mov [latchcache],bx ; save in memory for use in save and restore
; vga registers.
pop bx
pop es ; restore the 'normal' data segment
ret
getBIOSvideomode endp
;=========================================================================
; Function to modify the 256th palette entry for 256 colour mode. The
; driver requires white to be set in this DAC register triple.
;=========================================================================
modifyentry255 proc near
push ax
push dx
mov dx,03c8h
mov al,0ffh
out dx,al
inc dx
out dx,al
out dx,al
out dx,al
pop dx
pop ax
ret
modifyentry255 endp
;========================================================================
; Procedure to copy the required pointer image to the snapshot
; buffers. Each buffer holds a different instance of the mouse
; pointer for each possible alignment of the pointer image in
; a VRAM byte.
;
; INPUT DS:SI = pointer to the source image
;
;========================================================================
assume ds:nothing
copy_pointer_to_current proc near
push ds
push es
pusha
; Set up the destination for the copy
mov ax,cs ; point ES to this segment
mov es,ax
lea di,current_cursor ; this is the bit that must change
mov bx,di ; save this address for a while
mov bp,si ; save the application source address
; Fill the AND buffer with 1s and then fill the XOR buffer with
; 0s for the byte aligned pointer condition. This is done so that
; the last byte in the 3byte scanline sequence is set to the correct
; value to prevent image loss from the screen.
cld ; move low mem -> high mem
mov ax,24 ; avoid doing a modRM load of immediate
mov cx,ax ; 24 words to fill.
mov dx,ax ; store this for a while
xor ax,ax ; clear AX (AX = 0)
not ax ; AX = 0ffffh -> fill AND mask with it.
rep stosw ; fill the screen mask (AND mask)
mov cx,dx ; do the next 24 words (XOR mask)
not ax ; AX = 0h -> fill XOR mask with it
rep stosw ; Fill the cursor mask
; Now fill the prepared 48 word buffer with the user defined
; AND and XOR masks
; Note that the image passed in from the application is little-endian.
; To write to the VGA planes byte by byte, the image has to be reversed
; to big-endian for the purpose of quick drawing since the VGA can only
; read and write one byte from/to its latches.
mov di,bx ; point to the top of the buffer again
mov si,bp ; point to the new pointer image
mov cx,32
norept1:
lodsw ; read in the required image word
xchg al,ah ; convert little endian to big endian
stosw ; write into local buffer
inc di ; remember local buffer in 3 bytes wide
dec cx
jnz norept1
; Now, the aligned mask must be rotated, then copied into each of
; the seven unaligned image buffers.
mov ax,cs
mov ds,ax ; return to the default data segment
mov bp,1000000000000000b ; a mask for the MSBit
lea di,AlignData1 ; point to the buffer for 1 bit offset
mov si,bx ; source = byte aligned pointer image
push bx
mov bx,32*7
norept2:
lodsw ; load the word from 3 byte sequence
xchg al,ah ; put into little-endian format
mov cl,byte ptr [si] ; load the remaining byte
shr ax,1 ; LSB now stored in CF
rcr cl,1 ; CF into MSB, lsb into CF
jnc $+4 ; CF=0 -> don't need to do anything
or ax,bp ; OR in the carried bit from CF
xchg al,ah ; return to bitstream format
stosw ; write the rotated data
mov byte ptr[di],cl
inc si ; point to the next source scanline
inc di ; point to the next dest scanline
dec bx
jnz norept2
pop bx
; Just to do a little bit more work, the rotated buffers created
; above must be copied to the instances for byte 78 and byte 79
; of the scanline. These images are then cunningly clipped in the
; process to the edge of the screen!
mov si,bx ; BX points to the top of current buffer
; Note DI points to clip_cursor78 now
; may as well use the nice string functions now that I don't
; have to XCHG bytes. (how space and cycle efficient
xor al,al ; constant for putting in masks
; there are 8 instances for bits 0 to 7
mov bx,8
norept3:
; Do the AND mask modifications for byte 78
not al ; AL = 11111111b
REPT 16 ; 16 scanlines
movsw ; copy contents of AND word
stosb ; Nice clear AND mask = 11111111b
inc si ; point to the first image byte in
; the next scanline
ENDM
; Do the XOR mask modifications for byte 78
not al ; AL = 00000000b
REPT 16 ; 16 scanlines
movsw ; copy contents of XOR word
stosb ; Nice clear XOR mask = 00000000b
inc si ; point to the first image byte in
; the next scanline
ENDM
dec bx
jnz norept3
; prepare the BYTE 79 instances
; SI and DI should be in the right place
xor ax,ax ; constant for putting in masks
mov bx,2 ; constant for addressing source
; there are 8 instances for bits 0 to 7
mov cx,8
norept4:
; Do the AND mask modifications for byte 79
not ax ; AX = 0ffffh
REPT 16 ; 16 scanlines
movsb ; copy contents of AND byte
stosw ; Nice clear AND mask (=0ffffh)
add si,bx ; point to the first image byte in
; the next scanline
ENDM
; Do the XOR mask modifications for byte 79
not ax ; AX = 0h
REPT 16 ; 16 scanlines
movsb ; copy contents of XOR byte
stosw ; Nice clear XOR mask
add si,bx ; point to the first image byte in
; the next scanline
ENDM
dec cx
jz norept4quit
jmp norept4
norept4quit:
popa
pop es
pop ds
ret
copy_pointer_to_current endp
;========================================================================
; Procedure to determine the segment of the video buffer for
; the current display mode.
;========================================================================
assume ds:SpcMseSeg
getvideobuffer proc near
push ax
push si
; determine the current video mode from the BIOS and save it.
; Use this value to determine the video buffer segment address.
mov ah,0fh ; use the bios to get the video mode
int 10h
cbw ; create a table index
shl ax,1 ; word sized table entries
mov si,ax
mov ax,[videomodetable+si] ; use video mode to index the table
mov [videobufferseg],ax
pop si
pop ax
ret
getvideobuffer endp
IFDEF DEBUGMOUSE
;=========================================================================
; Code to provide 32 bit side with a dump of the VGA registers on request.
;=========================================================================
VGAregs db 9+5+25 dup(?) ; enough room for sequencer, GC and CTRC
dumpVGAregs proc near
call DOCLI
pusha
push ds
mov ax,cs
mov ds,ax
assume ds:SpcMseSeg
; Save the Graphics Controller registers
xor bx,bx ; Index into the G.C. register saving array
mov dx,03ceh ; Graphics Controller index register
xor ax,ax
mov cx,9 ; save 9 G.C. registers
norept5:
mov al,ah
out dx,al ; Select it
inc dx ; Address the register
in al,dx ; Get the register contents
mov [VGAregs+bx],al ; Save the register
inc bx ; index to next array entry
inc ah
dec dx ; Sequencer index register
dec cx
jnz norept5
; Save the Sequencer registers
mov dx,03c4h ; Sequencer index register
xor ax,ax
mov cx,5 ; save 5 sequencer registers
norept6:
mov al,ah
out dx,al ; Select it
inc dx ; Address the register
in al,dx ; Get the register contents
mov [VGAregs+bx],al ; Save the register
inc bx ; index to next array entry
inc ah
dec dx ; Sequencer index register
dec cx
jnz norept6
; Save the CRTC registers
mov dx,03d4h ; CRTC index register
xor ax,ax
mov cx,25 ; save 25 sequencer registers
norept7:
mov al,ah
out dx,al ; Select it
inc dx ; Address the register
in al,dx ; Get the register contents
mov [VGAregs+bx],al ; Save the register
inc bx ; index to next array entry
inc ah
dec dx ; CRTC index register
dec cx
jnz norept7
pop ds
popa
call DOSTI
bop 0feh ; return to 32 bit land
dumpVGAregs endp
ENDIF ; DEBUGMOUSE
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;
; End of Mouse driver general support functions
;
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;========================================================================
; Procedure to draw an EGA pointer image on the graphics screen at a
; specified bit location.
;
; Input: CX = pointer offset in the current VRAM byte.
; DX = offset in the video buffer to pointer
; Output: None
; Modifies: AX,BX,CX,DX,BP,SI,DI
;========================================================================
assume ds:SpcMseSeg
.286
even
drawEGApointer proc near
push es
push ds
mov ax,cs
mov ds,ax
cld ; index from low memory to high for LODSB
; point to the video buffer
mov ax,0a000h
mov es,ax
mov bp,dx ; save the byte offset in VRAM for the XOR code
; Select the Graphics Controller
mov dx,03ceh
;************ AND MASK OPERATION **************************
; use the bit position to select the relavent pointer image
shl cx,1 ; need a word offset into LUT
mov di,cx ; need an index register
mov bx,[PointerLUT]
mov si,[bx+di] ; Point to the screen (AND) mask
mov di,bp ; point to the byte offset in VRAM
mov ax,0803h ; Index the data rotate register and select AND
out dx,ax ; do it
mov ax,80-2 ; Avoid modRM loading of CX
mov cx,ax ; A constant handily kept in a register
; The pointer contains 16 words of information
push bx
mov bx,16
norept8:
lodsw ; Load 2 bytes from the AND mask into AL and AH
xchg al,es:[di] ; Latch the 8 pixels for updating.
; and write them back out with new data
inc di ; point to the next byte in VRAM
xchg ah,es:[di] ; Latch the 8 pixels for updating.
; and write them back out with new data
inc di ; point to the next byte in VRAM
lodsb ; Load a byte from the AND mask into AL
xchg al,es:[di] ; Latch the 8 pixels for updating.
; and write them back out with new data
add di,cx ; point to the next byte in VRAM on the next scan
; line to write to. CX contains 80-2
dec bx
jnz norept8
pop bx
;************ XOR MASK OPERATION **************************
; Note: SI points to current_cursor+48 now, automatically
; i.e. at the start of the XOR mask.
mov di,bp ; point to the byte offset in VRAM
mov ax,1803h ; Index the DATA ROTATE REGISTER and
; Select the XOR function to XOR CPU data in
out dx,ax ; Do the deed
push bx
mov bx,16
norept9:
lodsw ; Load 2 bytes from the AND mask into AL and AH
xchg al,es:[di] ; Latch the 8 pixels for updating.
; and write them back out with new data
inc di ; point to the next byte in VRAM
xchg ah,es:[di] ; Latch the 8 pixels for updating.
; and write them back out with new data
inc di ; point to the next byte in VRAM
lodsb ; Load a byte from the XOR mask into AL
xchg al,es:[di] ; Latch the 8 pixels for updating.
; and write them back out with new data
add di,cx ; point to the next byte in VRAM on the next scan
; line to write to. CX contains 80-2
dec bx
jnz norept9
pop bx
pop ds
pop es
ret
drawEGApointer endp
;========================================================================
; Procedure to determine what the byte and bit offset is, in the current
; VGA buffer for the top left hand corner of the pointer bitmap.
; The X,Y value is modified for hotspot in this routine. A flag is set,
; also, to relay whether or not the cursor bitmap is byte aligned or not.
;
; INPUT: CX,DX = pointer x,y coordinates
; OUT : DX = byte offset to top left hand pointer pixel
; CX = bit offset in the byte
; CF = set if it is not possible to draw the pointer on the
; screen because of the hotspot adjustment. (Usually a
; negative hotspot value will cause clipping and wrapping
; problems at the right and bottom screen boundaries.
;========================================================================
determineboundary proc near
push ax
push bx
push es
; do the adjustment in x,y for pointer hotspot
; Also test for top or left screen boundary problems
; and zero the coordinate if it goes negative.
sub cx,[hotspot] ; adjust the x cartesian coord for hotspot
jns dont_zero_x ; if x goes negative, assume zero
xor cx,cx
dont_zero_x:
sub dx,[hotspot+2] ; adjust the y cartesian coord for the hotspot
jns dont_zero_y ; if y goes negative, assume zero
xor dx,dx
dont_zero_y:
; Now check the right and bottom bounds to prevent the pointer
; image wrapping if the hotspot adjustment forces either of
; the coordinates to exceed the screen bounds.
; First, for all video modes that this function handles, the
; X bound is always x < 640 ... check this first.
cmp cx,640
jl didntexceedX
stc ; Oh oh - failed, so set carry flag.
jmp short quitdet ; bye bye.
didntexceedX:
; Now check out the y value by finding the maximum extent from
; a lut based on the current BIOS video mode.
mov ax,40h ; B.D.A. segment
mov es,ax ; and ES points to it.
mov al,byte ptr es:[49h]
sub al,0fh ; table is normalized. mode f is in entry
; zero.
xor ah,ah ; create a look up table index
shl ax,1 ; for a table with word sized elements.
xchg bx,ax ; use a suitable register as index
cmp dx,[hiresylut+bx] ; get the extent and compare y coord.
jl didntexceedY
stc ; Oh oh - failed, so set carry flag.
jmp short quitdet ; bye bye.
didntexceedY:
; determine the byte offset from the start of the video buffer
; for the modified coordinates. First calculate how many bytes
; there are for the number of scanlines -1 to where the pointer
; is.
mov ax,dx ; copy Y position into AX
shl ax,1 ; create a word table index
xchg ax,bx ; copy table index into a base register
mov dx,[mult80lut+bx] ; do a fast LUT multiply by 80
; determine the byte position of the pixel in question
mov ax,cx ; save the x-coordinate displacement
and ax,7 ; do a modulus 8 to find the pixel position
; in the byte. The bit number is in DX.
; add the whole number of bytes in the current row to the number
; of complete-row bytes
shr cx,3 ; divide pixels by 8 to get bytes
add dx,cx ; DX hold the complete byte offset.
xchg ax,cx ; CX = bit offset in the byte.
; the pointer has not exceeded the screen buonds, so clear
; the carry flag to signify this.
clc
; Wind up the routine and return with the carry flag:
; SET if cursor exceeded screen bounds.
; CLEAR otherwise.
quitdet:
pop es
pop bx
pop ax
ret
determineboundary endp
;========================================================================
; Procedure to buffer up the data over which the cursor will next be
; drawn. This data will be used to replace the cursor at a later point
; when the cursor position has changed and for generating a cursor image
; To prevent having separate routines for aligned and unaligned pointer
; saves, this routine saves a pixel block 24 x 16 deep in all cases. The
; start offset is a byte location into VRAM in which the pointer TLHC lives.
;
; Input: DX = VRAM byte
; Modifies: AX,BX,DI,CX,DX,ES
;
;========================================================================
assume ds:SpcMseSeg
even
save_background proc near
push ds
push es
pusha
mov ax,cs ; point DS briefly at the driver data
mov ds,ax
mov es,ax ; point ES to the driver segment
lea di,behindcursor ; DESTINATION: a nice, safe place in the
; driver segment
mov ax,0a000h ; point DS at VRAM
mov ds,ax
assume ds:nothing
mov bp,dx ; save DX=VRAM byte offset for later use
mov dx,03ceh ; VGA GC index register
mov al,4 ; select the read map select reg
out dx,al ; Index in the map select register
inc dx ; DX holds port address to map select register
xor al,al ; plane 0 will be selected first
cld ; make sure to address forward in memory
mov ah,3 ; number of bytes to copy per pointer scanline
xor cx,cx ; counter for the REP MOVSB
mov bx,80-3 ; another handy constant: move to next scanline
; byte.
REPT 4 ; read the 4 EGA planes individually
mov si,bp ; SOURCE: somewhere in VRAM
out dx,al ; do the plane selection
inc al ; select the next plane to latch
; note that only one byte at a time may be read from the latches
; do 16 scanlines for each plane
push dx
mov dx,16
@@:
mov cl,ah ; CX now contains 3
rep movsb ; copy 3 bytes from VRAM to data segment
add si,bx ; move down to the first byte in next scanline
dec dx
jnz @B ; norept10
pop dx
ENDM
popa
pop es
pop ds
ret
save_background endp
;========================================================================
; Procedure to restore the area of the screen that was behind the cursor
; before it had moved.
;
; Note. Currently (2/12/92) this is the only routine that modifies the
; VGA sequencer. Therefore, the code from save and restore vga registers
; that maintain the sequencer registers has been moved to here for
; centralisation purposes.
;
; Input: DX = VRAM byte
; Output: None
; Modifies: AX,BX,CX,DX,DI,SI
;========================================================================
assume ds:SpcMseSeg
even
restore_background proc near
push ds
push es
pusha
;; call DOCLI ; turn off interrupts
mov ax,cs
mov ds,ax ; point at the driver data segment
mov ax,0a000h ; videobufferseg
mov es,ax ; point ES at VRAM segment
mov bp,dx ; save the pointer for later
mov si,offset behindcursor ; SOURCE: point at the stored planes
; set up the Graphic Controller for the restore.
mov dx,03ceh ; VGA GC index register
mov ax,0003h ; Select copy into latches function
out dx,ax ; i.e. data rotate -> replace
mov ax,0ff08h ; bitmask register reset
out dx,ax
; do the 4 plane restore.
mov cx,80-2 ; point to the first byte in image on next line
cld ; write forward in memory
mov bx,0102h ; BH = initial plane mask value
; plane 0 is selected with a 1
; BL = map mask register offset
mov dx,03c4h ; index register for sequencer
mov al,bl ; point to the map mask register in sequencer
out dx,al ; index the register into 03c5h
inc dx ; point to the data register
in al,dx ; read the data register value in
dec dx ; restore DX to 03c4h
mov [seqregs],al ; save the map mask register value
REPT 4 ; 4 planes to restore
mov di,bp ; DESTINATION: pointer into VRAM
mov ax,bx ; select the plane to mask and map mask register
out dx,ax ; do the mask
shl bh,1 ; point to the mask for the next iteration
push dx
mov dx,16
@@:
lodsw ; load the old background data (ONE WORD)
xchg al,es:[di] ; latch the VRAM data and swap with the
inc di ; point to next byte to replace
xchg ah,es:[di] ; latch the VRAM data and swap with the
inc di ; point to next byte to replace
lodsb ; load the old background data (ONE BYTE)
xchg al,es:[di] ; latch the VRAM data and swap with the
add di,cx ; point to the first byte in image on next line
dec dx
jnz @B ; norept11
pop dx
ENDM
mov ah,[seqregs] ; the old map mask value
mov al,bl ; need to restore the map mask register
out dx,ax ; do the restore
;; call DOSTI ; reenable interrupts.
popa
pop es
pop ds
ret
restore_background endp
;==========================================================================
; Procedure to save the register state of the VGA card on receiving a
; mouse pointer update interrupt. This procedure also sets up the following
; VGA registers to nice values for the driver.
;
; mode register <write mode 0, read mode 0>
; data rotate register <do not rotate, no logical ops>
; enable set/reset register <disable set/reset>
;
;==========================================================================
even
assume ds:SpcMseSeg
saveVGAregisters proc near
push dx
push di
push es
; Save the Graphics Controller registers that the
; Driver uses
xor bx,bx ; Index into the G.C. register saving array
mov dx,03ceh ; Graphics Controller index register
xor al,al
push cx
mov cx,9 ; save 9 G.C. registers
norept12:
out dx,al ; Select it
inc dx ; Address the register
in al,dx ; Get the register contents
mov [GCregs+bx],al ; Save the register
inc bx ; index to next array entry
mov al,bl
dec dx ; G.C. index register
dec cx
jnz norept12
pop cx
; save the latches to location in a bit of video buffer
; off the screen.
mov ax,0a000h ; point to the video buffer
mov es,ax
assume es:nothing
mov ax,0105h ; select write mode 1 to squirt latches out
out dx,ax ; do the selection
mov di,[latchcache] ; 1 byte over the last location
mov es:[di],al ; write the latches out to the planes
; disable the enable set/reset register
mov ax,01h ; select enable set/reset register and clear it
out dx,ax
; clear the data rotate register (no logical operations).
inc ax
inc ax ; select data rotate register and clear it
out dx,ax ; AX = 3 therefore points to the DRR
; set write mode 0 for the graphics display
; conveniently, this also sets read mode to 0 which is needed too!
inc ax
inc ax ; select write mode 0
out dx,ax ; AX = 5, i.e. the mode register
; color don't care. don't care for all planes
inc ax ;register 7, color don't care
inc ax
out dx, ax
; bit mask register. enable all planes
;
inc ax ;register 8, bit mask
not ah
out dx, ax
pop es
pop di
pop dx
ret
saveVGAregisters endp
;==========================================================================
; Procedure to restore the register state of the VGA card after dealing
; with mouse pointer update interrupt.
;==========================================================================
restoreVGAregisters proc near
assume ds:SpcMseSeg
push es
push di
push bx
; restore the latches that where saved in the video planes
mov ax,0a000h ; point to the video buffer
mov es,ax
assume es:nothing
mov di,[latchcache] ; the byte just off the end of the buffer
mov al,es:[di] ; read in the latches
; Restore the Graphics Controller registers that the
; Driver uses
xor ax,ax ; create an index
xor bx,bx ; Index into the G.C. register saving array
mov dx,03ceh ; Graphics Controller index register
norept13:
mov ah,[GCregs+bx] ; restore the register
out dx,ax ; Select it
inc al ; index for the next register
inc bx ; index to next array entry
cmp al,9
jne norept13
pop bx
pop di
pop es
ret
restoreVGAregisters endp
;=======================================================================
; Procedure to draw a BIOS Mode 4 graphics pointer to the display.
; Input: DX = byte offset
; CL = bit offset in the byte
; CH = 0FFh if ODD, 0 if EVEN
; BP = Y loop counter, ODD in LSB, EVEN in MSB
;=======================================================================
drawmode4pointer proc near
pusha
push es
cld
xchg dx, bp ;
mov di, bp ; bp = di = byte offset, dx = y counters
mov ax,0b800h ; point a segment register to
mov es,ax ; the CGA video buffer.
or ch, ch ;
je drawonevenscanline ;
jmp drawonoddscanline ; otherwise do an ODD job
; ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN ANDEVEN
drawonevenscanline:
mov si,[mode4SelectedPointer]
; Load a word of the pointer image, convert it to two bits per
; pixel and write to the screen for even scanlines
xor cx, cx
mov cl, dh ; number of even scanlines to draw
push dx
evensl1:
mov dx,3
norept14:
lodsb ; load 8 pixels from pointer bitmap
xor bh,bh ; want a zero extended 16 bit value
mov bl,al ; copy into a base register
shl bx,1 ; create a word address
mov ax,[LUT1to2bit+bx] ; get the byte to word conversion
xchg al,ah ; little-endianise
mov bx,es:[di] ; get the current displayed 8 pixels
and ax,bx ; AND the AND mask in
stosw ; write to the video buffer
dec dx
jnz norept14
add si,3
add di,80-6
loop evensl1
pop dx
; Load a word of the pointer image, convert it to two bits per
; pixel and write to the screen for odd scanlines
mov si,[mode4SelectedPointer]
add si,3
mov di,bp
add di,02000h ; offset into video buffer
; the video buffer
mov cl,dl ; number of odd scanlines to draw
push dx
oddsl1:
mov dx,3
norept15:
lodsb ; load 8 pixels from bitmap
xor bh,bh
mov bl,al ; copy into a base register
shl bx,1 ; create a word address
mov ax,[LUT1to2bit+bx] ; get the byte to word conversion
xchg al,ah
mov bx,es:[di] ; get the current displayed 8 pixels
and ax,bx ; AND the AND mask in
stosw ; write to the video buffer
dec dx
jnz norept15
add si,3
add di,80-6
loop oddsl1
pop dx
; XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN XOREVEN
mov si,[mode4SelectedPointer]
add si,48
mov di,bp ; offset into video buffer
; Load a word of the pointer image, convert it to two bits per
; pixel and write to the screen for even scanlines
mov cl,dh ; number of even scanlines to draw
push dx
evensl2:
mov dx,3
norept16:
lodsb ; load 8 pixels from bitmap
xor bh,bh
mov bl,al ; copy into a base register
shl bx,1 ; create a word address
mov ax,[LUT1to2bit+bx] ; get the byte to word conversion
xchg al,ah
mov bx,es:[di] ; get the current displayed 8 pixels
xor ax,bx ; XOR the XOR mask in
stosw ; write to the video buffer
dec dx
jnz norept16
add si,3
add di,80-6
loop evensl2
pop dx
; Load a word of the pointer image, convert it to two bits per
; pixel and write to the screen for odd scanlines
mov si,[mode4SelectedPointer]
add si,48+3
mov di,bp
add di,02000h ; offset into video buffer
; the video buffer
mov cl,dl ; number of odd scanlines to draw
oddsl2:
mov dx,3
norept17:
lodsb ; load 8 pixels from bitmap
xor bh,bh
mov bl,al ; copy into a base register
shl bx,1 ; create a word address
mov ax,[LUT1to2bit+bx] ; get the byte to word conversion
xchg al,ah
mov bx,es:[di] ; get the current displayed 8 pixels
xor ax,bx ; XOR the XOR mask in
stosw ; write to the video buffer
dec dx
jnz norept17
add si,3
add di,80-6
loop oddsl2
pop es
popa
ret
; ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD ANDODD
;
; This part of the code draws the pointer on an odd numbered scanline
; of the video display. Since the video buffer is split, 0000 to 1fff
; containing even scanlines and 2000 to 3fff containing odd, the data
; must be manipulated in a subtly different fashion than that of the
; even display scanline code.
; The even scanline code display arrangement falls through naturally,
; with an even scanline drawing thus:
; buffer 0: scanline 0
; buffer 1: scanline 0
; buffer 0: scanline 1
; buffer 1: scanline 1
; buffer 0: scanline 2
; buffer 1: scanline 2 etc.
; whereas in the odd case:
; buffer 1: scanline 0
; buffer 0: scanline 0
; buffer 1: scanline 1
; buffer 0: scanline 1
; buffer 1: scanline 2
; buffer 0: scanline 2 etc.
; and this requires that the odd image scanlines must be placed
; one scanline lower in the even buffer than the even image scanlines
; do in the odd buffer
drawonoddscanline:
; Load a word of the pointer image, convert it to two bits per
; pixel and write to the screen for odd scanlines
mov si,[mode4SelectedPointer]
add di,02000h ; offset into video buffer
; the video buffer
xor cx,cx
mov cl,dl ; number of odd scanlines to draw
push dx
oddsl3:
mov dx,3
norept18:
lodsb ; load 8 pixels from bitmap
xor bh,bh
mov bl,al ; copy into a base register
shl bx,1 ; create a word address
mov ax,[LUT1to2bit+bx] ; get the byte to word conversion
xchg al,ah
mov bx,es:[di] ; get the current displayed 8 pixels
and ax,bx ; AND the AND mask in
stosw ; write to the video buffer
dec dx
jnz norept18
add si,3
add di,80-6
loop oddsl3
pop dx
; Load a word of the pointer image, convert it to two bits per
; pixel and write to the screen for even scanlines
and dh,dh
jz dontdothis1 ; can't do the loop 0 times
mov si,[mode4SelectedPointer]
add si,3
mov di,bp
add di,6 ; This is required to align the
; even and odd scanlines together
mov cl,dh ; number of even scanlines to draw
push dx
evensl3:
add di,80-6 ; remember even BELOW odd
mov dx,3
norept19:
lodsb ; load 8 pixels from bitmap
xor bh,bh
mov bl,al ; copy into a base register
shl bx,1 ; create a word address
mov ax,[LUT1to2bit+bx] ; get the byte to word conversion
xchg al,ah
mov bx,es:[di] ; get the current displayed 8 pixels
and ax,bx ; AND the AND mask in
stosw ; write to the video buffer
dec dx
jnz norept19
add si,3
loop evensl3
pop dx
dontdothis1:
; XORODD XORODD XORODD XORODD XORODD XORODD XORODD XORODD XORODD XORODD XORODD
mov si,[mode4SelectedPointer]
add si,48
mov di,bp ; offset into video buffer
add di,02000h ; offset into video buffer
; the video buffer
; Load a word of the pointer image, convert it to two bits per
; pixel and write to the screen for odd scanlines
mov cl,dl ; number of odd scanlines to draw
push dx
oddsl4:
mov dx,3
norept20:
lodsb ; load 8 pixels from bitmap
xor bh,bh
mov bl,al ; copy into a base register
shl bx,1 ; create a word address
mov ax,[LUT1to2bit+bx] ; get the byte to word conversion
xchg al,ah
mov bx,es:[di] ; get the current displayed 8 pixels
xor ax,bx ; XOR the XOR mask in
stosw ; write to the video buffer
dec dx
jnz norept20
add si,3
add di,80-6
loop oddsl4
pop dx
; Load a word of the pointer image, convert it to two bits per
; pixel and write to the screen for even scanlines
and dh,dh ; can't do a loop 0 times
jz dontdothis2
mov si,[mode4SelectedPointer]
add si,48+3
mov di,bp
add di,6
mov cl,dh ; number of even scanlines to draw
evensl4:
add di,80-6
mov dx,3
norept21:
lodsb ; load 8 pixels from bitmap
xor bh,bh
mov bl,al ; copy into a base register
shl bx,1 ; create a word address
mov ax,[LUT1to2bit+bx] ; get the byte to word conversion
xchg al,ah
mov bx,es:[di] ; get the current displayed 8 pixels
xor ax,bx ; XOR the XOR mask in
stosw ; write to the video buffer
dec dx
jnz norept21
add si,3
loop evensl4
dontdothis2:
; XORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXORXOR
pop es
popa
ret
drawmode4pointer endp
;========================================================================
; Procedure to determine what the byte and bit offset is, in the current
; VGA buffer for the top left hand corner of the pointer bitmap.
; The X,Y value is modified for hotspot in this routine.
; Y looping counter(ODD and EVEN) are also returned
; The CGA buffer is interleaved, and runs from B800:0000 to B800:1999 for
; odd scanlines and from B800:2000 for even scanlines.
;
; INPUT: CX,DX = pointer x,y coordinates
; OUT :
; carry set if either X or Y is out of screen
; DX = byte offset to top left hand pointer pixel of the pointer
; CL = bit offset in the byte
; CH = 0FFh if ODD, 0 if EVEN
; BP = Y loop counter(ODD in LSB and EVEN in MSB)
;========================================================================
detboundmode4 proc near
push ax
push bx
push ds
mov ax,cs
mov ds,ax
assume ds:SpcMseSeg
; do the adjustment in x,y for pointer hotspot
; modify the raw X,Y values for hotspot
sub cx,[hotspot] ; adjust the x cartesian coord for hotspot
jns dont_zero_xmode4; if x goes negative, assume zero
xor cx,cx
dont_zero_xmode4:
sub dx,[hotspot+2] ; adjust the y cartesian coord for the hotspot
jns dont_zero_ymode4; if y goes negative, assume zero
xor dx,dx
dont_zero_ymode4:
cmp cx, 320 ;
jae detboundmode4_exit ; CY is cleared
cmp dx, 200
jae detboundmode4_exit ; CY is cleared
; determine the byte offset from the start of the video buffer
; for the modified coordinates. First calculate how many bytes
; there are for the number of scanlines -1 to where the pointer
; is. Also if the pointer starts on a odd scanline, set CF, else
; clear CF.
mov ax,dx ; copy Y position into AX
mov bp,dx ; copy Y position into BP for use later
; CGA video buffer is split in two. Therefore, screen scanline 0 maps
; to video buffer scanline 0 and screen scanline 1 maps to video
; buffer+2000h, scanline 0
and ax,0fffeh ; do the mapping 0->0, 1->0, 2->1, 3->1 etc.
; and create a word table index
mov bx, ax ; copy table index into a base register
; 2bits/pixel -> 4 pixels/byte
; sine x total is 320, we have 80bytes
; so a shl bx, 1 will be wrong.
mov dx,[mult80lut+bx] ; do a fast LUT multiply by 80
; determine the byte position of the pixel in question
mov ax,cx ; save the x-coordinate displacement
and ax,3 ; do a modulus 4 to find the pixel position
; in the byte. The byte number will be in DX.
; add the whole number of bytes in the current row to the number
; of complete-row bytes. Note that mode 4 is 2bits per pixel, so
; there are four pixels represented by one byte.
mov bx,cx ; Save in a base reg. to create a table index
shl bx,1 ; Create a table index for word sized entries
add dx,[mode4clipCXadjustLUT+bx]; DX hold the complete byte offset.
mov cx, ax ; CX = bit offset in the byte.
mov ax, [mode4pointerLUT + bx] ; select appropriate pointer
mov [mode4SelectedPointer], ax
; Odd or Even scanline? note BP contains y cartesian coordinate
mov bx, bp ; y coordinate
shr bp, 1 ; shift right to determine if odd or even
; CF if odd, or 0 if even.
sbb ch, ch ; CH = 0FFh if ODD, 0 if EVEN
shl bx, 1
mov bp, [mode4clipDXLUT + bx] ;the Y counters
stc ; we are fine, set the CY so we will return
; CY cleared.
detboundmode4_exit:
cmc ; revese the CY
pop ds
pop bx
pop ax
ret
detboundmode4 endp
;=============================================================================
; Procedure to save the area of CGA video buffer into which the pointer will
; be drawn. The memory buffer in which this data is stored is arranged odd
; scanlines first, then even. So, the first 48 bytes are the odd scanline
; data.
;
; Input: DX = byte offset
; CL = bit offset in the byte
; CH = 0FFh if ODD, 0 if EVEN
; BP = Y loop counter, ODD in LSB, EVEN in MSB
;
;=============================================================================
savebkgrndmode4 proc near
pusha
push es
push ds
; set up the segment registers as required
mov ax,ds
mov es,ax
mov ax,0b800h
mov ds,ax
assume ds:nothing, es:SpcMseSeg
mov si,dx ; start the save.
or ch, ch
je svbkeven ; check the returned carry flag
; the image's first scanline is odd
mov di,offset CGAbackgrnd ; where the background will be saved
mov bx,bp ; set the loop counter up
xor bh,bh ; don't want unwanted mess in MSB
add si,2000h ; odd part of buffer starts at 2000h
svodd1:
mov cx,3 ; copy six bytes
rep movsw ; do the image scanline save
add si,80-6 ; point to the next scanline
dec bx ; decrement the loop counter
jnz svodd1 ; do more scanlines if necessary
; save some even scanlines if need be.
mov si,dx ; offset into CGA buffer
add si, 80
mov bx,bp ; set up the loop counter
xchg bl,bh ; get the even part of loop counter
xor bh,bh ; trash the top end trash
and bx,bx ; check for a zero loop
jz misseven ; can't have a loop which execs 0 times
mov di,offset CGAbackgrnd+48; where the background will be saved
sveven1:
mov cx,3 ; copy six bytes = 24 pixels
rep movsw ; do the scanline save
add si,80-6 ; point to the next scanline
dec bx ; decrement the loop counter
jnz sveven1 ; do more scanlines if necessary
misseven: ; jump to here if there are no even scanlines to draw
jmp short endsavemode4
svbkeven: ; the image's first scanline is even
mov di,offset CGAbackgrnd+48; where the background will be saved
mov bx,bp ; get the loop counter
xchg bl,bh ; rearrage to get the even part
xor bh,bh ; clear out the trash
sveven2:
mov cx,3 ; copy six bytes
rep movsw ; do the copy
add si,80-6 ; point to the next scanline
dec bx ; decrement the loop counter
jnz sveven2 ; do more scanlines if necessary
mov si,dx ; offset into CGA buffer
add si,2000h ; odd part of the video buffer
mov di,offset CGAbackgrnd ; where to save the odd scanlines
mov bx,bp ; get the loop counter
xor bh,bh ; clear out the unwanted trash
svodd2:
mov cx,3 ; copy six bytes
rep movsw ; do the copy
add si,80-6 ; point to the next scanline
dec bx ; decrement the loop counter
jnz svodd2 ; do more scanlines if necessary
endsavemode4:
assume ds:SpcMseSeg, es:nothing
pop ds
pop es
popa
ret
savebkgrndmode4 endp
;=============================================================================
; Procedure to restore the area of CGA video buffer into which the pointer
; was drawn. The memory buffer in which this data is stored is arranged
; odd scanlines first, then even. So, the first 48 bytes are the odd scanline
; data.
;
; Input:
; DX = byte offset to top left hand pointer pixel of the pointer
; CL = bit offset in the byte
; CH = 0FFh if ODD, 0 if EVEN
; BP = Y loop counter(ODD in LSB and EVEN in MSB)
;
;=============================================================================
restorebkgrndmode4 proc near
pusha
push es
; set up the segment registers as required
mov ax,0b800h
mov es,ax
mov di,dx ; restore background
or ch, ch
je rsbkeven ; check the returned carry flag
; the image's first scanline is odd. The CGA buffer is translated
; so that a scanline (row N) from the even part of the buffer appears
; on the screen at raster I. The scanline at position N from the
; odd part of the video buffer maps to screen position I+1. If the
; 1st. scanline is odd, then this is drawn at raster A and the
; following algorithm draws the 1st. even row at raster A+1 to
; compensate for the video buffer arrangement.
mov si,offset CGAbackgrnd ; where the background is be saved
add di,2000h ; do the odd buffer
mov bx,bp ; set the loop counter up
xor bh,bh ; clear out the MSB trash
rsodd1:
mov cx,3 ; copy six bytes
rep movsw ; do the restore
add di,80-6 ; point to the next odd scanline
dec bx ; decrement the loop counter
jnz rsodd1 ; restore more even scanlines if needed
mov bx,bp ; let the loop counter
xchg bl,bh ; get the even part
xor bh,bh ; clear out the MSB trash
and bx,bx ; test for zero even scanlines
jz misseven1rs ; can't have a zero execute loop
mov di,dx ; offset into CGA buffer
add di,80 ; get the odd/even scanlines instep
mov si,offset CGAbackgrnd+48; where the background is be saved
rseven1:
mov cx,3 ; restore six bytes
rep movsw ; do the restore
add di,80-6 ; point to the next even scanline
dec bx ; decrement the loop counter
jnz rseven1 ; restore more even scanlines if needed
misseven1rs: ; jump to here if there are no even scanlines to be restored.
jmp short endrestoremode4
rsbkeven: ; the image's first scanline is even
mov si,offset CGAbackgrnd+48; where the background will be saved
mov bx,bp ; get the loop counter
xchg bl,bh ; get the even part of the loop counter
xor bh,bh ; scrap the MSB trash
rseven2:
mov cx,3 ; restore six bytes
rep movsw ; do the restore
add di,80-6 ; point to the next even scanline
dec bx ; decrement the loop counter
jnz rseven2 ; do more even scanlines if needed
mov di,dx ; offset into CGA buffer
add di,2000h ; do the odd buffer
mov si,offset CGAbackgrnd ; where to save the odd scanlines
mov bx,bp ; set the loop counter up
xor bh,bh ; scrap the MSB trash
rsodd2:
mov cx,3 ; restore six bytes
rep movsw ; do the restore
add di,80-6 ; point to the next odd scanline
dec bx ; decrement the loop counter
jnz rsodd2 ; restore more odd scanlines if needed
endrestoremode4:
assume ds:SpcMseSeg, es:nothing
pop es
popa
ret
restorebkgrndmode4 endp
;============================================================================
; Procedure to draw the pointer image into the video buffer for mode 13h
; VGA graphics.
;
; Input:
; DX = byte offset
; BP = Y loop counter
; CX = X loop counter
;
;============================================================================
draw256pointer proc near
pusha
push es
push ds
mov ax,0a000h ; point to the 256 colour mode video buffer
mov es,ax
mov ax,cs
mov ds,ax
assume ds:SpcMseSeg, es:nothing
cld ; write forward through the buffer
; DX = TLHC pixel offset in the video buffer.
mov di,dx ; point DI at the video buffer location of fun
mov si, offset current_cursor ; we only use this cursor shape
; because every pixel is on byte
; boundary. The X counter would
; take care of X clipping
y_256:
push cx
lodsw ;and mask
mov dx, [si + 48 - 2] ;xor mask
inc si ;we don't need the third byte
xchg al, ah ; byte sequence
xchg dh, dl ;
x_256:
shl ax, 1 ;AND mask bit
sbb bl, bl ; bl = 0FFf if CY, 0 if not CY
and bl, es:[di] ;and the target and save the result
shl dx, 1 ;XOR mask bit
sbb bh, bh ;
xor bl, bh ;xor with the save result
mov es:[di], bl ;update the target
inc di ;next pixel
loop x_256 ;until this scan line is done
pop cx ;recovery X loop counter
add di, 320 ;target address to next scan line
sub di, cx
dec bp ;Y counter
jne y_256
pop ds
pop es
popa
ret
draw256pointer endp
;=============================================================================
; Procedure to save the area of 256 colour mode video buffer into which the
; pointer will be drawn. The memory buffer in which this data is stored is
; arranged odd scanlines first, then even. So, the first 48 bytes are the odd
; scanline data.
;
; Input:
; DX = byte offset
; BP = Y loop counter
; CX = X loop counter
;
;=============================================================================
savebkgrndmode13 proc near
pusha
push es
push ds
mov di,offset bkgrnd256 ; point to the area in which backgound
; data will be saved
mov si,dx ; SOURCE: the video buffer at x,y
mov ax,0a000h
mov ds,ax
mov ax,cs
mov es,ax
mov bx, cx ;x counter
mov dx, 320
sub dx, bx
assume ds:nothing, es:SpcMseSeg
cld
save_256_loop:
mov cx, bx
shr cx, 1
rep movsw
adc cl, 0
rep movsb
add si, dx ; next scan line offset
dec bp ; until Y counter is done
jne save_256_loop
pop ds
pop es
assume es:nothing, ds:SpcMseSeg
popa
ret
savebkgrndmode13 endp
;=============================================================================
; Procedure to replace an existing pointer image in the 256 colour video
; buffer with the data that was there previous to the pointer draw operation.
; The data is stored in an internal (to the driver) buffer.
;
; Input:
; DX = byte offset
; BP = Y loop counter
; CX = X loop counter
;
;=============================================================================
restorebkgrndmode13 proc near
pusha
push es
mov di,dx ; DESTINATION: in the VRAM
mov ax,0a000h ; point a segment register at video buffer
mov es,ax
assume es:nothing
mov bx, cx
mov si,offset bkgrnd256 ; where the data is saved
mov dx, 320
sub dx, bx
cld ; write forward in memory
restore_256_loop:
mov cx, bx
shr cx, 1
rep movsw
adc cl, 0
rep movsb
add di, dx
dec bp
jne restore_256_loop
pop es
popa
ret
restorebkgrndmode13 endp
;========================================================================
; Procedure to determine what the byte offset is, in the current
; VGA buffer for the top left hand corner of the pointer bitmap.
; The X,Y value is modified for hotspot in this routine. X and Y looping
; counters are also returned.
;
; INPUT: CX,DX = pointer x,y coordinates
; OUT :
; carry set if either X or Y is out of screen
; DX = byte offset to top left hand pointer pixel of the pointer
; CX = X counter
; BP = Y counter
;========================================================================
detboundmode13 proc near
push ax
push bx
push ds
mov ax,cs
mov ds,ax
assume ds:SpcMseSeg
; do the adjustment in x,y for pointer hotspot
; modify the raw X,Y values for hotspot
sub cx,[hotspot] ; adjust the x cartesian coord for hotspot
jns dont_zero_xmode13; if x goes negative, assume zero
xor cx,cx
dont_zero_xmode13:
sub dx,[hotspot+2] ; adjust the y cartesian coord for the hotspot
jns dont_zero_ymode13; if y goes negative, assume zero
xor dx,dx
dont_zero_ymode13:
cmp cx, 320
jae detboundmode13_exit ; CY is cleared
cmp dx, 200 ;
jae detboundmode13_exit ; CY is cleared
; CX and DX are now validated for the following section: buffer
; offset determination. Note, unlike other video modes, mode 13
; provides a direct mapping of the video display to video buffer.
; in other words; 1 byte represents 1 pixel. From this, it is not
; necessary to provide byte alignment data.
mov bx,dx ; save in a base register
shl bx,1 ; create a word table index
mov dx,[mult320LUT+bx] ; do the multiply by 320
; add in the offset along the current raster.
add dx,cx ; cx contains the byte offset from
mov ax,[mode4clipDXLUT + bx]; get Y loop counter from table
add al, ah ; the table has ODD/EVEN counters
cbw
mov bp, ax ; the final Y counter
; column 0.
mov ax, 320 ; calculate X loop counter
sub ax, cx
cmp ax, 16 ;
jl set_new_x_counter
mov ax, 16
set_new_x_counter:
mov cx, ax ; X counter
stc ; everything is fine, set CY
; so we will return CY cleared
detboundmode13_exit:
cmc ; complement the CY
pop ds
pop bx
pop ax
ret
detboundmode13 endp
public SpcMseEnd
SpcMseEnd label byte
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;
; Installation Code From Here Downwards
;
;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
; segment:offset table for redirected mouse functions for real rom version.
mio_table dw 38 dup(?)
assume cs:SpcMseSeg,ds:nothing,es:nothing
public InstSpcMse
;
; InstSpcMse - Installs the softpc mouse driver code
;
; Inputs: ds == Resident location of SpcMseSeg
; Outputs: None
;
InstSpcMse proc near
;;;;;;;;;;;;;;;;do ret to use old mouse driver;;; ret
pusha
; save old int 10 vector
xor ax,ax
mov es,ax
mov ax,es:[40h]
mov si,offset old_vid_int
mov word ptr ds:[si],ax
mov ax,es:[42h]
mov word ptr ds:[si+2],ax
mov bx,ds
mov si,offset sysinitgrp:mio_table
push ds
push cs
pop ds
mov word ptr ds:[si], offset mouse_io
mov word ptr ds:[si+2],bx
IFDEF MOUSE_VIDEO_BIOS
mov word ptr ds:[si+4],offset mouse_video_io
mov word ptr ds:[si+6],bx
ENDIF ; MOUSE_VIDEO_BIOS
mov word ptr ds:[si+8],offset mouse_int1
mov word ptr ds:[si+10],bx
mov word ptr ds:[si+12], offset mouse_version
mov word ptr ds:[si+14],bx
mov word ptr ds:[si+16],offset mouse_copyright
mov word ptr ds:[si+18],bx
mov word ptr ds:[si+20],offset video_io
mov word ptr ds:[si+22],bx
mov word ptr ds:[si+24],offset mouse_int2
mov word ptr ds:[si+26],bx
mov word ptr ds:[si+28],offset entry_point_from_32bit
mov word ptr ds:[si+30],bx
mov word ptr ds:[si+32],offset int33function0
mov word ptr ds:[si+34],bx
mov word ptr ds:[si+36],offset int33function1
mov word ptr ds:[si+38],bx
mov word ptr ds:[si+40],offset int33function2
mov word ptr ds:[si+42],bx
mov word ptr ds:[si+44],offset int33function9
mov word ptr ds:[si+46],bx
mov word ptr ds:[si+48],offset current_position_x
mov word ptr ds:[si+50],bx
mov word ptr ds:[si+52],offset current_position_y
mov word ptr ds:[si+54],bx
mov word ptr ds:[si+56],offset mouseINB
mov word ptr ds:[si+58],bx
mov word ptr ds:[si+60],offset mouseOUTB
mov word ptr ds:[si+62],bx
mov word ptr ds:[si+64],offset mouseOUTW
mov word ptr ds:[si+66],bx
mov word ptr ds:[si+68],offset VRAMlasttextcelloff
mov word ptr ds:[si+70],bx
mov word ptr ds:[si+72],offset internalCF
mov word ptr ds:[si+74],bx
mov word ptr ds:[si+76],offset function3data
mov word ptr ds:[si+78],bx
mov word ptr ds:[si+80],offset conditional_off
mov word ptr ds:[si+82],bx
pop ds
mov bx, offset sysinitgrp:mio_table
bop 0C8h ; Host mouse installer BOP
; get the freshly written int 33h vector from IVT
; write the vector segment:offset data to the jump patch
xor ax,ax
mov es,ax
mov ax,es:[33h*4]
mov bx,es:[(33h*4)+2]
mov si,offset moff
mov word ptr ds:[si],ax
mov word ptr ds:[si+2],bx
add ax,2 ; HLL entry point
mov si,offset loffset
mov word ptr ds:[si],ax
mov word ptr ds:[si+2],bx
; write the new value to the IVT
call DOCLI
mov bx, offset int33h_vector
mov word ptr es:[33h*4], bx
mov bx, ds
mov word ptr es:[(33h*4)+2], bx
call DOSTI
popa
ret
InstSpcMse endp
SpcMseSeg ends
end
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