221 lines
4.7 KiB
PHP
221 lines
4.7 KiB
PHP
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DOSDATA Segment
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;
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; first and second DOS patches
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; Non-console device read/write (system calls 3Fh and 40h)
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;
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; Code in disk.asm, 2 locations, one for read, one for write
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; DVRDLP:
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; DVWRTLP:
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;
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;
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; 036h lds si,SS:[????] ; ThisSFT
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; lds si,si+7 ; sf_devptr
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; 0E8h call ???? <- "simulate" int28 event ; DSKSTATCHK
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;
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;
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DOSP1_ID db 036h,0C5h,036h
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DOSP1_THISSFT db 036h,005h,0C5h,074h,007h,0E8h
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DOSP1_ID_LEN equ $-DOSP1_ID
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db 90h, 90h
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DOSP12_ID db 036h,0C5h,036h
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DOSP12_THISSFT db 036h,005h,0C5h,074h,007h,0E8h
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DOSP12_ID_LEN equ $-DOSP1_ID
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;
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; Third/Fourth DOS patch - System call 3Fh (Read) from console
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;
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; Code in disk.asm, 1 location
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; GETBUF:
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;
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; 051h push cx <- begin special int28 mode
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; push es
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; push di
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; mov dx,???? ; offset dosgroup:CONBUF
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; call ???? ; $STD_CON_STRING_INPUT
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; pop di
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; pop es
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; 059h pop cx <- end special int28 mode
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;
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DOSP3_ID db 051h,006h,057h,0BAh
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DOSP3_CONBUF db 029h,002h,0E8h
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DOSP3_ID_LEN equ $-DOSP3_ID
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db 09Ah,0E3h,05Fh,007h ; ???? , pop di, pop es
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DOSP4_ID db 059h ; pop cx
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DOSP4_ID_OFF equ (DOSP4_ID - DOSP3_ID)
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;
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; Fifth DOS patch - System call 40h (Write) to console
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;
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;
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; Code in disk.asm, 1 location
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;
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; push cx
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; WRCONLP: lodsb
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; cmp al,1Ah
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; jz ????
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; call ???? <- "simulate" int28 event
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; loop WRCONLP
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; CONEOF: pop ax
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;
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DOSP5_ID db 051h ; push cx
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db 0ACh,03Ch,01Ah,074h,005h
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db 0E8h ; call
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DOSP5_ID_LEN equ $-DOSP5_ID
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;
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; Seventh DOS patch - System call entry, patch USER_ID with VMid for share
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;
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; Code in disp.asm, 1 location
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;
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;
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; mov [SaveDS],ds
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; mov [SaveBX],bx
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; mov bx,cs
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; mov ds,bx
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; inc [indos]
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; xor ax,ax
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; mov [USER_ID],AX <- Patch to set USER_ID to VMID
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;
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;
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DOSP7_ID db 02Eh,08Ch,01Eh
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DOSP7_SAVEDS db 07Eh,05h ; mov [SaveDS],ds
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db 02Eh,089h,01Eh
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DOSP7_SAVEBX db 07Ch,05h ; mov [SaveBX],bx
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db 08Ch,0CBh ; mov bx,cs
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db 08Eh,0DBh ; mov ds,bx
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db 0FEh,006h
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DOSP7_INDOS db 0CFh,002h ; inc [indos]
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db 033h,0C0h ; xor ax,ax
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DOSP7_ID_LEN equ $-DOSP7_ID
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;
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; Eighth DOS patch - OWNER check in handle calls. For share, need to NOP test
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;
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; Code in handle.asm, 1 location in routine CheckOwner
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;
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;
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;
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; push ax
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; mov ax,ss:[USER_ID] <- patch to XOR AX,AX to set zero
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; cmp ax,es:[di.sf_UID] <- NOP
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; pop ax
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; jz ????
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;
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;
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;
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DOSP8_ID db 050h ; push ax
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db 036h,0A1h
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DOSP8_USER_ID db 0EAh,002h ; mov ax,ss:[USER_ID]
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db 026h,03Bh,045h ; cmp ax,es:[di+2F]
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DOSP8_ID_LEN equ $-DOSP8_ID
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db 02Fh,058h ; pop ax
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;
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; 10th, 11th, 12th DOS patch - System call 3Fh (Read) in raw mode
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;
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; Take RAW read to STDIN SFT and turn it into a polling loop doing
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; a yeild when a character is not ready to be read.
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;
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; Code in disk.asm, 3 locations
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;
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; DVRDRAW:
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; PUSH ES
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; POP DS
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; ReadRawRetry: <- Patch 10
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; MOV BX,DI
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; XOR AX,AX <- Reenter #2
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; MOV DX,AX
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; call SETREAD
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; PUSH DS <- Reenter #1
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; LDS SI,[THISSFT]
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; call DEVIOCALL
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; MOV DX,DI
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; MOV AH,86H
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; MOV DI,[DEVCALL.REQSTAT]
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; TEST DI,STERR
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; JZ CRDROK
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; call CHARHARD
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; MOV DI,DX
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; OR AL,AL
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; JZ CRDROK
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; CMP AL,3
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; JZ CRDFERR
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; POP DS
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; JMP ReadRawRetry
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;
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; CRDFERR:
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; POP DI <- Patch 11
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; DEVIOFERR:
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; LES DI,[THISSFT]
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; jmp SET_ACC_ERR_DS
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;
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; CRDROK:
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; POP DI <- Patch 12
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; MOV DI,DX
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; ADD DI,[CALLSCNT]
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; JMP SHORT ENDRDDEVJ3
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;
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;
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DOSP10_ID db 006H,01FH
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DOSP10_LOC_OFFSET equ $-DOSP10_ID
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DOSP10_LOC db 08BH,0DFH
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DOSP10_REENT2_OFFSET equ $-DOSP10_LOC
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db 033H,0C0H,08BH,0D0H,0E8H
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DOSP10_ID_LEN equ $-DOSP10_ID
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db 0DFH,00EH
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DOSP10_REENT1_OFFSET equ $-DOSP10_LOC
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db 01EH,036H,0C5H,036H,036H,005H,0E8H,0AFH,00EH
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db 08BH,0D7H,0B4H,086H,036H,08BH,03EH
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DOSP10_PACKVAL_OFFSET equ $-DOSP10_ID
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db 009H,003H
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db 0F7H,0C7H,000H,080H,074H,019H,0E8H,047H,017H
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db 08BH,0FAH,00AH,0C0H,074H,010H,03CH,003H,074H,003H
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db 01FH,0EBH,0CFH
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DOSP11_LOC_OFFSET equ $-DOSP10_ID
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db 05FH
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DOSP11_REENT_OFFSET equ $-DOSP10_LOC
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db 036H,0C4H,03EH,036H,005H,0E9H,0A1H,004H
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DOSP12_LOC_OFFSET equ $-DOSP10_ID
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db 05FH,08BH,0FAH
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;
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; 13th DOS patch - Actually a SYSINIT patch. Patches the stack fault code
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; which prints the fatal stack fault error on DOS >= 3.20.
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;
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; Sets focus to current VM so user can see fatal message.
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;
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;
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; l0: lodsb <- Setfocus here
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; cmp al, '$'
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; je l1
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; mov bl, 7
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; mov ah, 0Eh
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; int 10h
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; jmp l0
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; l1: jmp $
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;
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;
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;
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DOSP13_ID db 0ACh ; l0: lodsb
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db 03Ch,024h ; cmp al, '$'
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db 074h,008h ; je l1
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db 0B3h,007h ; mov bl, 7
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db 0B4h,00Eh ; mov ah, 0Eh
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db 0CDh,010h ; int 10h
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db 0EBh,0F3h ; jmp l0
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db 0EBh,0FEh ; l1: jmp $
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DOSP13_ID_LEN equ $-DOSP13_ID
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DOSDATA ends
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