908 lines
17 KiB
NASM
908 lines
17 KiB
NASM
|
;******************************************************************************
|
||
|
|
;
|
||
|
|
; Simulator 16
|
||
|
|
;
|
||
|
|
; Author : Chandan Chauhan
|
||
|
|
;
|
||
|
|
; Date : 1/28/91
|
||
|
|
;
|
||
|
|
;******************************************************************************
|
||
|
|
|
||
|
|
include incs.inc ; segment definitions
|
||
|
|
|
||
|
|
|
||
|
|
MAXSIZE EQU 1024 ; 1k length
|
||
|
|
|
||
|
|
Arg1 EQU [bp+6]
|
||
|
|
Arg2 EQU [bp+8]
|
||
|
|
|
||
|
|
WOW32_Buffer EQU [bp+6] ; buffer address
|
||
|
|
WOW32_Size EQU [bp+8] ; length of VDM memory
|
||
|
|
WOW32_Off EQU [bp+10] ; off of VDM memory
|
||
|
|
WOW32_Sel EQU [bp+12] ; sel of VDM memory
|
||
|
|
WOWStackNP EQU [bp+6] ; WOWStack
|
||
|
|
WOWStackOff EQU [bp+6]
|
||
|
|
WOWStackSel EQU [bp+8]
|
||
|
|
|
||
|
|
extrn Initialize:near
|
||
|
|
|
||
|
|
MAIN_DATA SEGMENT
|
||
|
|
PUBLIC TransmitPkt, ReceivePkt, ReceivePktPtr, RespPkt, ToWOW32Pkt
|
||
|
|
PUBLIC ACKPkt, NAKPkt, GetMemPkt, SetMemPkt, WAKEUPPkt
|
||
|
|
PUBLIC fReceive, fRxCount, fRxError, RxPktLen
|
||
|
|
PUBLIC fTxCount, fTransmitting
|
||
|
|
PUBLIC fInitTime
|
||
|
|
PUBLIC VDMAddress
|
||
|
|
PUBLIC WOWStack, WOW32Buffer
|
||
|
|
|
||
|
|
Reserved DB 16 DUP (0) ; reserved
|
||
|
|
|
||
|
|
TransmitPkt DD -1 ; packet being transmitted
|
||
|
|
TransmitPktLen DW 0 ; packet being transmitted
|
||
|
|
TransmitPktPtr DW 0 ; byte to Tx
|
||
|
|
|
||
|
|
ReceivePkt DB MAXSIZE DUP (0FFh) ; packet being received
|
||
|
|
ReceivePktPtr DW 0 ; packet being received
|
||
|
|
|
||
|
|
RespPkt DB MAXSIZE DUP (0FFh) ; packet being transmitted
|
||
|
|
|
||
|
|
ToWOW32Pkt DB 9 DUP (?) ; ToWOW32 packet
|
||
|
|
DB 0
|
||
|
|
|
||
|
|
WAKEUPPkt DB 9 DUP (0) ; WAKEUP packet
|
||
|
|
DB 0
|
||
|
|
|
||
|
|
ACKPkt DB 5 DUP (?) ; ACK packet
|
||
|
|
DB 0
|
||
|
|
|
||
|
|
NAKPkt DB 5 DUP (?) ; NAK packet
|
||
|
|
DB 0
|
||
|
|
|
||
|
|
GetMemPkt DB MAXSIZE DUP (?) ;***************
|
||
|
|
SetMemPkt DB MAXSIZE DUP (?) ;***************
|
||
|
|
|
||
|
|
|
||
|
|
VDMAddress DD -1 ; stores VDM sel:off
|
||
|
|
VDMLength DW -1 ; number of bytes
|
||
|
|
|
||
|
|
WOW32Buffer DD -1 ; ptr caller's buffer
|
||
|
|
WOWStack DD -1 ; ptr to caller's WOWStack
|
||
|
|
|
||
|
|
fTxCount DW 0
|
||
|
|
fTransmitting DW 0
|
||
|
|
|
||
|
|
fReceive DW 0
|
||
|
|
fRxCount DW 0
|
||
|
|
fRxError DW 0
|
||
|
|
|
||
|
|
fInitTime DW 0
|
||
|
|
fInitDLL DW 0
|
||
|
|
|
||
|
|
RxPktLen DW 0
|
||
|
|
|
||
|
|
Stack DW 256 DUP (?)
|
||
|
|
StackTop DW ?
|
||
|
|
OldSS DW ?
|
||
|
|
OldSP DW ?
|
||
|
|
Scratch DW ?
|
||
|
|
fStackUse DW -1
|
||
|
|
|
||
|
|
IntRoutines LABEL WORD
|
||
|
|
DW COMISR_MSR
|
||
|
|
DW COMISR_Transmit
|
||
|
|
DW COMISR_Receive
|
||
|
|
DW COMISR_LSR
|
||
|
|
|
||
|
|
HelloString DB cr, lf, 'WOW Simulator *****', cr, lf, lf
|
||
|
|
DB 'Hello, this is a test string !!!!!!!!!!', cr, lf
|
||
|
|
HelloStringLen EQU $ - HelloString
|
||
|
|
|
||
|
|
MAIN_DATA ENDS
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
MAIN_CODE SEGMENT
|
||
|
|
ASSUME CS:MAIN_CODE, DS:MAIN_DATA, ES:NOTHING
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
; S I M U L A T O R L A Y E R
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; Sim32SendSim16
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
;***************
|
||
|
|
|
||
|
|
PROCEDURE Sim32SendSim16 PUBLIC, FAR
|
||
|
|
|
||
|
|
push bp ; save stack frame
|
||
|
|
mov bp, sp
|
||
|
|
|
||
|
|
pusha ; temps...
|
||
|
|
push ds ; temps...
|
||
|
|
push es ; temps...
|
||
|
|
|
||
|
|
mov bx, ds
|
||
|
|
|
||
|
|
mov ax, SEG MAIN_DATA
|
||
|
|
mov ds, ax
|
||
|
|
mov si, OFFSET WAKEUPPkt ; DS:SI -> WAKEUP packet
|
||
|
|
|
||
|
|
|
||
|
|
mov ax, WOWStackNP
|
||
|
|
mov WOWStack._off, ax
|
||
|
|
mov WOWStack._sel, bx
|
||
|
|
|
||
|
|
cmp fInitTime, 0
|
||
|
|
je Sim32SendSim16_Init
|
||
|
|
|
||
|
|
|
||
|
|
les bx, WOWStack ; ES:BX -> SS:SP of WOW VDM task
|
||
|
|
mov ax, es:[bx]._off ; get SP
|
||
|
|
mov [si].MEM_OFF, ax
|
||
|
|
mov ax, es:[bx]._sel ; get SS
|
||
|
|
mov [si].MEM_SEL, ax
|
||
|
|
|
||
|
|
call Xceive
|
||
|
|
|
||
|
|
Sim32SendSim16_Ret:
|
||
|
|
les bx, WOWStack ; ES:BX -> SS:SP of WOW VDM task
|
||
|
|
mov di, OFFSET ReceivePkt
|
||
|
|
mov ax, [di].ToWOW32_OFF
|
||
|
|
mov es:[bx]._off, ax
|
||
|
|
mov ax, [di].ToWOW32_SEL
|
||
|
|
mov es:[bx]._sel, ax
|
||
|
|
|
||
|
|
|
||
|
|
pop es ; temps...
|
||
|
|
pop ds ; temps...
|
||
|
|
popa ; temps...
|
||
|
|
|
||
|
|
mov sp, bp
|
||
|
|
pop bp
|
||
|
|
|
||
|
|
ret 2
|
||
|
|
|
||
|
|
Sim32SendSim16_Init:
|
||
|
|
call Receive
|
||
|
|
inc fInitTime
|
||
|
|
call Initialize
|
||
|
|
jmp SHORT Sim32SendSim16_Ret
|
||
|
|
|
||
|
|
|
||
|
|
Sim32SendSim16 ENDP
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; Sim32GetVDMMemory
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
;***************
|
||
|
|
|
||
|
|
PROCEDURE Sim32GetVDMMemory PUBLIC, FAR
|
||
|
|
|
||
|
|
push bp ; save stack frame
|
||
|
|
mov bp, sp
|
||
|
|
|
||
|
|
pusha ; temps...
|
||
|
|
push ds ; temps...
|
||
|
|
push es ; temps...
|
||
|
|
|
||
|
|
mov bx, ds
|
||
|
|
|
||
|
|
mov ax, SEG MAIN_DATA
|
||
|
|
mov ds, ax
|
||
|
|
mov si, OFFSET GetMemPkt ; DS:SI -> ToWOW32 packet
|
||
|
|
|
||
|
|
mov ax, WOW32_Buffer ; get buffer's address
|
||
|
|
mov WOW32Buffer._off, ax
|
||
|
|
mov ax, bx
|
||
|
|
mov WOW32Buffer._sel, ax
|
||
|
|
|
||
|
|
mov ax, WOW32_Off
|
||
|
|
mov [si].MEM_OFF, ax
|
||
|
|
|
||
|
|
mov ax, WOW32_Sel
|
||
|
|
mov [si].MEM_SEL, ax
|
||
|
|
|
||
|
|
mov cx, WOW32_Size ; get the length
|
||
|
|
|
||
|
|
cmp cx, 3B6h
|
||
|
|
jg Sim32GetMem_Error
|
||
|
|
|
||
|
|
mov [si].MEM_LENGTH, cx
|
||
|
|
|
||
|
|
call Xceive ; send GetMem packet and pickup
|
||
|
|
; the response
|
||
|
|
mov cx, WOW32_Size
|
||
|
|
|
||
|
|
les di, WOW32Buffer ; ES:DI -> WOW32 buffer
|
||
|
|
mov si, OFFSET ReceivePkt+4
|
||
|
|
|
||
|
|
rep movsb
|
||
|
|
|
||
|
|
pop es ; temps...
|
||
|
|
pop ds ; temps...
|
||
|
|
popa ; temps...
|
||
|
|
|
||
|
|
mov sp, bp
|
||
|
|
pop bp
|
||
|
|
|
||
|
|
ret 8
|
||
|
|
|
||
|
|
|
||
|
|
Sim32GetMem_Error:
|
||
|
|
int 3
|
||
|
|
|
||
|
|
Sim32GetVDMMemory ENDP
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; Sim32SetVDMMemory
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
;***************
|
||
|
|
|
||
|
|
PROCEDURE Sim32SetVDMMemory PUBLIC, FAR
|
||
|
|
|
||
|
|
push bp ; save stack frame
|
||
|
|
mov bp, sp
|
||
|
|
|
||
|
|
pusha ; temps...
|
||
|
|
push ds ; temps...
|
||
|
|
push es ; temps...
|
||
|
|
|
||
|
|
mov bx, ds
|
||
|
|
|
||
|
|
mov ax, SEG MAIN_DATA
|
||
|
|
mov ds, ax
|
||
|
|
mov di, OFFSET SetMemPkt ; DS:DI -> SetMem packet
|
||
|
|
|
||
|
|
mov ax, WOW32_Buffer ; get buffer's address
|
||
|
|
mov WOW32Buffer._off, ax
|
||
|
|
mov ax, bx
|
||
|
|
mov WOW32Buffer._sel, ax
|
||
|
|
|
||
|
|
mov ax, WOW32_Off
|
||
|
|
mov [di].MEM_OFF, ax
|
||
|
|
|
||
|
|
mov ax, WOW32_Sel
|
||
|
|
mov [di].MEM_SEL, ax
|
||
|
|
|
||
|
|
mov cx, WOW32_Size
|
||
|
|
|
||
|
|
cmp cx, 3B6h
|
||
|
|
jg Sim32SetMem_Error
|
||
|
|
|
||
|
|
mov [di].MEM_LENGTH, cx
|
||
|
|
mov bx, 11
|
||
|
|
add bx, cx
|
||
|
|
mov [di].Len, bx
|
||
|
|
add di, 0Ah
|
||
|
|
mov bx, ds
|
||
|
|
mov es, bx
|
||
|
|
|
||
|
|
lds si, WOW32Buffer ; DS:SI -> Buffer
|
||
|
|
rep movsb
|
||
|
|
mov BYTE PTR es:[di], EOT
|
||
|
|
|
||
|
|
mov ds, bx
|
||
|
|
mov si, OFFSET SetMemPkt ; DS:SI -> SetMem packet
|
||
|
|
|
||
|
|
call Xceive
|
||
|
|
|
||
|
|
pop es ; temps...
|
||
|
|
pop ds ; temps...
|
||
|
|
popa ; temps...
|
||
|
|
|
||
|
|
mov sp, bp
|
||
|
|
pop bp
|
||
|
|
|
||
|
|
ret 8
|
||
|
|
|
||
|
|
Sim32SetMem_Error:
|
||
|
|
int 3
|
||
|
|
|
||
|
|
Sim32SetVDMMemory ENDP
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; Sim16SendSim32
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PROCEDURE Sim16SendSim32 PUBLIC, FAR
|
||
|
|
|
||
|
|
push bp ; save stack frame
|
||
|
|
mov bp, sp
|
||
|
|
|
||
|
|
pusha ; temps...
|
||
|
|
push ds ; temps...
|
||
|
|
push es ; temps...
|
||
|
|
|
||
|
|
mov bx, ds
|
||
|
|
mov ax, SEG MAIN_DATA
|
||
|
|
mov ds, ax
|
||
|
|
mov si, OFFSET ToWOW32Pkt ; DS:SI -> ToWOW32 packet
|
||
|
|
|
||
|
|
cmp fInitDLL, 0
|
||
|
|
jne @f
|
||
|
|
|
||
|
|
pusha
|
||
|
|
call Initialize
|
||
|
|
popa
|
||
|
|
|
||
|
|
inc fInitDLL
|
||
|
|
|
||
|
|
@@:
|
||
|
|
|
||
|
|
; prepare ToWOW32 packet
|
||
|
|
|
||
|
|
mov ax, WOWStackOff
|
||
|
|
mov [si].ToWOW32_OFF, ax ;
|
||
|
|
mov ax, WOWStackSel
|
||
|
|
mov [si].ToWOW32_SEL, ax ;
|
||
|
|
|
||
|
|
; send it
|
||
|
|
|
||
|
|
call Xceive ; send ToWOW32 packet and pick up
|
||
|
|
; the response
|
||
|
|
|
||
|
|
Sim16SendSim32_Loop:
|
||
|
|
|
||
|
|
mov di, OFFSET Receivepkt
|
||
|
|
mov ax, [di].MEM_OFF ; get sel:off and length from
|
||
|
|
mov VDMAddress._off, ax ; packet
|
||
|
|
mov ax, [di].MEM_SEL
|
||
|
|
mov VDMAddress._sel, ax
|
||
|
|
mov ax, [di].MEM_LENGTH
|
||
|
|
mov VDMLength, ax
|
||
|
|
|
||
|
|
|
||
|
|
Sim16SendSim32_GetMem:
|
||
|
|
|
||
|
|
cmp [di].Command, GETMEM
|
||
|
|
jne Sim16SendSim32_SetMem
|
||
|
|
|
||
|
|
call GetVDMMemory ; get vdm memory
|
||
|
|
|
||
|
|
call Xceive ; send response and get next packet
|
||
|
|
|
||
|
|
jmp SHORT Sim16SendSim32_Loop
|
||
|
|
|
||
|
|
|
||
|
|
Sim16SendSim32_SetMem:
|
||
|
|
|
||
|
|
cmp [di].Command, SETMEM
|
||
|
|
jne Sim16SendSim32_PszLen
|
||
|
|
|
||
|
|
call SetVDMMemory ; get vdm memory
|
||
|
|
|
||
|
|
call Xceive ; send response and get next packet
|
||
|
|
|
||
|
|
jmp SHORT Sim16SendSim32_Loop
|
||
|
|
|
||
|
|
|
||
|
|
Sim16SendSim32_PszLen:
|
||
|
|
|
||
|
|
cmp [di].Command, PSZ
|
||
|
|
jne Sim16SendSim32_WakeUp
|
||
|
|
|
||
|
|
call PszLen
|
||
|
|
|
||
|
|
call Xceive ; send response and get next packet
|
||
|
|
|
||
|
|
jmp SHORT Sim16SendSim32_Loop
|
||
|
|
|
||
|
|
|
||
|
|
Sim16SendSim32_WakeUp:
|
||
|
|
|
||
|
|
cmp [di].Command, WAKEUP
|
||
|
|
jne Sim16SendSim32_Error
|
||
|
|
|
||
|
|
|
||
|
|
Sim16SendSim32_Done:
|
||
|
|
|
||
|
|
pop es ; temps...
|
||
|
|
pop ds ; temps...
|
||
|
|
popa ; temps...
|
||
|
|
|
||
|
|
IFDEF STACKSWITCH
|
||
|
|
cli
|
||
|
|
mov sp, VDMAddress._off
|
||
|
|
mov ss, VDMAddress._sel ; could be a task switch !
|
||
|
|
sub sp, 8
|
||
|
|
sti
|
||
|
|
ENDIF
|
||
|
|
|
||
|
|
pop bp
|
||
|
|
|
||
|
|
ret 4
|
||
|
|
|
||
|
|
Sim16SendSim32_Error:
|
||
|
|
|
||
|
|
int 3
|
||
|
|
mov si, OFFSET NAKPkt
|
||
|
|
call Xceive
|
||
|
|
jmp SHORT Sim16SendSim32_Loop
|
||
|
|
|
||
|
|
Sim16SendSim32 ENDP
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; GetVDMMemory
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PROCEDURE GetVDMMemory, PUBLIC
|
||
|
|
ASSUME CS:MAIN_CODE, DS:DGROUP
|
||
|
|
|
||
|
|
push di
|
||
|
|
push es
|
||
|
|
push ds
|
||
|
|
|
||
|
|
mov ax, ds
|
||
|
|
mov es, ax
|
||
|
|
|
||
|
|
mov di, OFFSET RespPkt+4 ; ES:DI -> Response Packet
|
||
|
|
|
||
|
|
mov cx, VDMLength
|
||
|
|
lds si, VDMAddress ; DS:SI -> memory to get
|
||
|
|
|
||
|
|
rep movsb
|
||
|
|
|
||
|
|
pop ds
|
||
|
|
pop es
|
||
|
|
pop di
|
||
|
|
|
||
|
|
mov si, OFFSET RespPkt ; DS:SI -> Resp packet
|
||
|
|
mov ax, si
|
||
|
|
|
||
|
|
mov cx, VDMLength
|
||
|
|
add cx, 5
|
||
|
|
mov [si].Len, cx
|
||
|
|
add si, cx
|
||
|
|
dec si
|
||
|
|
mov [si], BYTE PTR EOT
|
||
|
|
|
||
|
|
mov si, ax ; DS:SI -> Resp packet
|
||
|
|
|
||
|
|
ret
|
||
|
|
|
||
|
|
GetVDMMemory ENDP
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; SetVDMMemory
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PROCEDURE SetVDMMemory, PUBLIC
|
||
|
|
ASSUME CS:MAIN_CODE, DS:DGROUP
|
||
|
|
|
||
|
|
push di
|
||
|
|
push es
|
||
|
|
|
||
|
|
lea si, ReceivePkt.DataM ; DS:SI -> Data to set
|
||
|
|
|
||
|
|
mov cx, VDMLength
|
||
|
|
les di, VDMAddress ; DS:SI -> memory to set
|
||
|
|
|
||
|
|
rep movsb
|
||
|
|
|
||
|
|
mov si, OFFSET RespPkt ; DS:DI -> Response Packet
|
||
|
|
|
||
|
|
mov [si].Len, 7
|
||
|
|
mov [si].MEM_OFF, 0AAh
|
||
|
|
mov BYTE PTR [si].MEM_SEL, EOT
|
||
|
|
|
||
|
|
pop es
|
||
|
|
pop di
|
||
|
|
|
||
|
|
ret
|
||
|
|
|
||
|
|
SetVDMMemory ENDP
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; PszLen
|
||
|
|
;
|
||
|
|
; This routine returns the length of the null terminated string
|
||
|
|
; address specified by VDMAddress.
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PROCEDURE PszLen, PUBLIC
|
||
|
|
ASSUME CS:MAIN_CODE, DS:DGROUP
|
||
|
|
|
||
|
|
push di
|
||
|
|
push es
|
||
|
|
|
||
|
|
les di, VDMAddress ; ES:DI -> String
|
||
|
|
mov cx, 0FFFFh
|
||
|
|
|
||
|
|
sub ax, ax ; look for null
|
||
|
|
repne scasb
|
||
|
|
jnz PszLen_Notfound
|
||
|
|
|
||
|
|
xor cx, 0FFFFh ; CX = length of string
|
||
|
|
mov si, OFFSET RespPkt ; DS:DI -> Response Packet
|
||
|
|
|
||
|
|
mov [si].Len, 7
|
||
|
|
mov [si].MEM_OFF, cx
|
||
|
|
mov BYTE PTR [si].MEM_SEL, EOT
|
||
|
|
|
||
|
|
pop es
|
||
|
|
pop di
|
||
|
|
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
PszLen_Notfound:
|
||
|
|
|
||
|
|
int 3
|
||
|
|
|
||
|
|
pop es
|
||
|
|
pop di
|
||
|
|
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
PszLen ENDP
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
; T R A N S P O R T L A Y E R
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; Xceive - TransCeive
|
||
|
|
;
|
||
|
|
; DS:SI -> Packet to be transmitted
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PROCEDURE Xceive, PUBLIC
|
||
|
|
ASSUME CS:MAIN_CODE, DS:DGROUP
|
||
|
|
|
||
|
|
mov RxPktLen, -1
|
||
|
|
mov ReceivePktPtr, 0
|
||
|
|
mov fReceive, 0
|
||
|
|
mov fRxCount, 0
|
||
|
|
mov fRxError, 0
|
||
|
|
|
||
|
|
call StartTransmitter
|
||
|
|
|
||
|
|
Xceive_Loop:
|
||
|
|
cmp fReceive, 0
|
||
|
|
je Xceive_Loop
|
||
|
|
|
||
|
|
mov fReceive, 0
|
||
|
|
|
||
|
|
cmp fRxError, 0
|
||
|
|
jne Xceive_NAK
|
||
|
|
|
||
|
|
cmp ReceivePkt, SOH
|
||
|
|
jne Xceive_NAK
|
||
|
|
|
||
|
|
mov bx, ReceivePkt.Len
|
||
|
|
dec bx
|
||
|
|
|
||
|
|
cmp ReceivePkt.[bx], EOT
|
||
|
|
jne Xceive_NAK
|
||
|
|
|
||
|
|
xor ax, ax
|
||
|
|
ret
|
||
|
|
|
||
|
|
Xceive_NAK:
|
||
|
|
cmp fRxCount, MAXCOUNT
|
||
|
|
jg Xceive_Error
|
||
|
|
|
||
|
|
inc fRxCount
|
||
|
|
|
||
|
|
mov si, OFFSET NAKPkt
|
||
|
|
|
||
|
|
jmp SHORT Xceive_Loop
|
||
|
|
|
||
|
|
Xceive_Error:
|
||
|
|
|
||
|
|
int 3
|
||
|
|
mov ax, 1
|
||
|
|
ret
|
||
|
|
|
||
|
|
Xceive ENDP
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; Receive
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PROCEDURE Receive, PUBLIC
|
||
|
|
ASSUME CS:MAIN_CODE, DS:DGROUP
|
||
|
|
|
||
|
|
mov RxPktLen, -1
|
||
|
|
mov ReceivePktPtr, 0
|
||
|
|
mov fReceive, 0
|
||
|
|
mov fRxCount, 0
|
||
|
|
|
||
|
|
Receive_Loop:
|
||
|
|
cmp fReceive, 0
|
||
|
|
je Receive_Loop
|
||
|
|
|
||
|
|
mov fReceive, 0
|
||
|
|
|
||
|
|
cmp fRxError, 0
|
||
|
|
jne Receive_NAK
|
||
|
|
|
||
|
|
xor ax, ax
|
||
|
|
ret
|
||
|
|
|
||
|
|
Receive_NAK:
|
||
|
|
|
||
|
|
cmp fRxCount, MAXCOUNT
|
||
|
|
jg Receive_Error
|
||
|
|
|
||
|
|
inc fRxCount
|
||
|
|
|
||
|
|
mov si, OFFSET NAKPkt
|
||
|
|
|
||
|
|
call StartTransmitter
|
||
|
|
|
||
|
|
jmp SHORT Receive
|
||
|
|
|
||
|
|
Receive_Error:
|
||
|
|
|
||
|
|
int 3
|
||
|
|
mov ax, 1
|
||
|
|
ret
|
||
|
|
|
||
|
|
Receive ENDP
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
; S E R I A L D R I V E R
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; Start Transmitter
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PROCEDURE StartTransmitter, PUBLIC
|
||
|
|
ASSUME CS:MAIN_CODE, DS:DGROUP
|
||
|
|
|
||
|
|
StartTransmitter_Loop:
|
||
|
|
cmp fTransmitting, 1
|
||
|
|
je StartTransmitter_Loop
|
||
|
|
|
||
|
|
mov TransmitPkt._sel, ds
|
||
|
|
mov TransmitPkt._off, si
|
||
|
|
mov ax, [si].Len ; get packet length
|
||
|
|
mov TransmitPktLen, ax
|
||
|
|
mov TransmitPktPtr, 0
|
||
|
|
|
||
|
|
mov fTransmitting, 1
|
||
|
|
|
||
|
|
cmp TransmitPktLen, 0
|
||
|
|
je StartTransmitter_Ret
|
||
|
|
|
||
|
|
mov dx, SERIALPORT ; COM1 or COM2
|
||
|
|
mov dl, IER ; turn on interrupts on 8250
|
||
|
|
in al, dx
|
||
|
|
DELAY
|
||
|
|
|
||
|
|
or al, TxInt
|
||
|
|
out dx, al
|
||
|
|
DELAY
|
||
|
|
|
||
|
|
StartTransmitter_Ret:
|
||
|
|
ret
|
||
|
|
|
||
|
|
StartTransmitter ENDP
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; Interrupt Routine
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PUBLIC COMISR, COMISR_LSR, COMISR_Receive, COMISR_Transmit, COMISR_MSR
|
||
|
|
|
||
|
|
COMISR:
|
||
|
|
push ax
|
||
|
|
push ds
|
||
|
|
|
||
|
|
mov ax, SEG DGROUP
|
||
|
|
mov ds, ax
|
||
|
|
|
||
|
|
DISABLE
|
||
|
|
|
||
|
|
call NewStack
|
||
|
|
|
||
|
|
pusha
|
||
|
|
push es
|
||
|
|
|
||
|
|
COMISR_More:
|
||
|
|
mov dx, SERIALPORT
|
||
|
|
mov dl, IIR
|
||
|
|
in al, dx
|
||
|
|
test al, IntPending ; is int pending ?
|
||
|
|
jnz COMISR_Ret ; no int is pending
|
||
|
|
|
||
|
|
xor ah, ah
|
||
|
|
mov di, ax
|
||
|
|
shr di, 1
|
||
|
|
add di, di
|
||
|
|
jmp [di].IntRoutines ; service int
|
||
|
|
|
||
|
|
|
||
|
|
COMISR_LSR:
|
||
|
|
INT3
|
||
|
|
mov fRxError, 1
|
||
|
|
mov dx, SERIALPORT
|
||
|
|
mov dl, LSR
|
||
|
|
in al, dx
|
||
|
|
DELAY
|
||
|
|
|
||
|
|
jmp SHORT COMISR_More
|
||
|
|
|
||
|
|
COMISR_Receive:
|
||
|
|
mov dx, SERIALPORT
|
||
|
|
in al, dx
|
||
|
|
DELAY
|
||
|
|
|
||
|
|
mov bx, ReceivePktPtr
|
||
|
|
mov [bx].ReceivePkt, al
|
||
|
|
inc ReceivePktPtr
|
||
|
|
|
||
|
|
cmp bx, 03
|
||
|
|
jne COMISR_ReceiveNext
|
||
|
|
|
||
|
|
mov ax, WORD PTR ReceivePkt+2
|
||
|
|
dec ax
|
||
|
|
mov RxPktLen, ax
|
||
|
|
|
||
|
|
COMISR_ReceiveNext:
|
||
|
|
cmp bx, RxPktLen
|
||
|
|
jne @f
|
||
|
|
|
||
|
|
mov fReceive, 1 ; receive Done !
|
||
|
|
@@:
|
||
|
|
jmp SHORT COMISR_More
|
||
|
|
|
||
|
|
|
||
|
|
COMISR_Transmit:
|
||
|
|
cmp TransmitPktLen, 0
|
||
|
|
jne COMISR_Send
|
||
|
|
|
||
|
|
mov dx, SERIALPORT
|
||
|
|
mov dl, IER ; turn off interrupts on 8250
|
||
|
|
in al, dx
|
||
|
|
DELAY
|
||
|
|
|
||
|
|
and al, NOT TxInt
|
||
|
|
out dx, al
|
||
|
|
DELAY
|
||
|
|
|
||
|
|
mov fTransmitting, 0
|
||
|
|
|
||
|
|
jmp SHORT COMISR_More
|
||
|
|
|
||
|
|
COMISR_Send:
|
||
|
|
les bx, DWORD PTR TransmitPkt
|
||
|
|
mov di, TransmitPktPtr
|
||
|
|
mov al, BYTE PTR es:[bx][di]
|
||
|
|
mov dx, SERIALPORT
|
||
|
|
out dx, al
|
||
|
|
DELAY
|
||
|
|
inc TransmitPktPtr
|
||
|
|
dec TransmitPktLen
|
||
|
|
|
||
|
|
jmp COMISR_More
|
||
|
|
|
||
|
|
|
||
|
|
COMISR_MSR:
|
||
|
|
INT3
|
||
|
|
mov fRxError, 1
|
||
|
|
mov dx, SERIALPORT
|
||
|
|
mov dl, MSR
|
||
|
|
in al, dx
|
||
|
|
DELAY
|
||
|
|
|
||
|
|
jmp COMISR_More
|
||
|
|
|
||
|
|
|
||
|
|
COMISR_Ret:
|
||
|
|
DELAY
|
||
|
|
|
||
|
|
pop es
|
||
|
|
popa
|
||
|
|
|
||
|
|
call OldStack
|
||
|
|
|
||
|
|
DISABLE
|
||
|
|
|
||
|
|
mov al, EOI
|
||
|
|
out PIC, al
|
||
|
|
pop ds
|
||
|
|
pop ax
|
||
|
|
iret
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; New Stack
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PROCEDURE NewStack, PUBLIC
|
||
|
|
ASSUME CS:MAIN_CODE, DS:DGROUP
|
||
|
|
|
||
|
|
inc fStackUse
|
||
|
|
jnz NewStack_Ret
|
||
|
|
|
||
|
|
pop Scratch
|
||
|
|
mov OldSS, ss
|
||
|
|
mov OldSP, sp
|
||
|
|
push ds
|
||
|
|
pop ss
|
||
|
|
mov sp, OFFSET StackTop
|
||
|
|
push Scratch
|
||
|
|
|
||
|
|
NewStack_Ret:
|
||
|
|
ret
|
||
|
|
|
||
|
|
NewStack ENDP
|
||
|
|
|
||
|
|
|
||
|
|
;*****************************************************************************
|
||
|
|
;
|
||
|
|
; Old Stack
|
||
|
|
;
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
PROCEDURE OldStack, PUBLIC
|
||
|
|
ASSUME CS:MAIN_CODE, DS:DGROUP
|
||
|
|
|
||
|
|
DISABLE
|
||
|
|
cmp fStackUse, 0
|
||
|
|
jne OldStack_Ret
|
||
|
|
|
||
|
|
pop Scratch
|
||
|
|
mov ss, OldSS
|
||
|
|
mov sp, OldSP
|
||
|
|
push Scratch
|
||
|
|
|
||
|
|
OldStack_Ret:
|
||
|
|
dec fStackUse
|
||
|
|
ENABLE
|
||
|
|
ret
|
||
|
|
|
||
|
|
OldStack ENDP
|
||
|
|
|
||
|
|
|
||
|
|
MAIN_CODE ENDS
|
||
|
|
|
||
|
|
END
|