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Black Box 4
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dosutils
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bootany.arj
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BOOTIO.ASM
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Assembly Source File
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1990-10-28
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1KB
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45 lines
page 61,132
TITLE bootio.c
_DATA SEGMENT WORD PUBLIC 'DATA'
_DATA ENDS
DGROUP GROUP _DATA
ASSUME DS: DGROUP, SS: DGROUP
_TEXT SEGMENT WORD PUBLIC 'CODE'
ASSUME CS: _TEXT
PUBLIC _BOOTIO
_BOOTIO PROC NEAR
;
; Semantics int bootio(int iotype, char *buffer)
;
push BP
mov BP,SP ; Save stack pointer
push ES
push SS
pop ES
push BX
push CX
push DX
mov AX,WORD PTR [BP+4] ; Get iotype
mov AH,AL ; Move to correct byte
mov AL,1 ; Read 1 track
mov BX,WORD PTR [BP+6] ; Get buffer address
mov DX,80h ; Head 0, Drive C
mov CX,1 ; Cylinder 0, sector 1
int 13h ; perform I/O
jc error
xor AX, AX ; show good status
jmp SHORT goback
error:
mov AX, -1 ; show bad status
goback:
pop DX
pop CX
pop BX
pop ES
mov SP,BP
pop BP
ret
_BOOTIO ENDP
_TEXT ENDS
END