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Length: 3323 (0xcfb)
Types: TextFile
Notes: UNIX file
Names: »chanint.asm«
└─⟦0cfe73749⟧ Bits:30004154/config.imd SW95707I VP/ix MS-DOS emulator Rel. 1.1
└─⟦0cfe73749⟧ UNIX Filesystem
└─⟦this⟧ »vc/new/usr/vpix/src/channels/chanint.asm«
;=============================================================================\r
; Interrupt-handler for channels test program\r
;=============================================================================\r
\r
\r
;=============================================================================\r
; Declarations\r
;=============================================================================\r
\r
; declare the UNIX buffer\r
\r
extrn _unixbuff:byte ; UNIX->DOS comm buffer\r
\r
; definitions for printing the UNIX message\r
\r
DOS_SYSCALL equ 21H ; DOS syscall interrupt number\r
DOS_PUTCHAR equ 2 ; DOS output char syscall code\r
CR equ 0DH ; ASCII carriage return\r
LF equ 0AH ; ASCII line feed\r
\r
\r
;=============================================================================\r
; Data\r
;=============================================================================\r
\r
\r
DGROUP group _DATA\r
_DATA segment word public 'DATA'\r
assume ds:DGROUP\r
\r
_DATA ends\r
\r
\r
;=============================================================================\r
; Code\r
;=============================================================================\r
\r
assume cs:_TEXT\r
\r
_TEXT segment public byte 'CODE'\r
\r
\r
;============================================================================\r
; interrupt handler - print the message from the UNIX->DOS buffer\r
;============================================================================\r
\r
public _inthdl\r
\r
_inthdl proc far\r
\r
; disable interrupts\r
\r
cli\r
\r
; save flags and registers\r
\r
pushf\r
push ax\r
push bx\r
push cx\r
push dx\r
push ds\r
push es\r
push di\r
push si\r
push bp\r
\r
; point DS:SI at the UNIX->DOS communication buffer\r
\r
mov ax, seg _unixbuff\r
mov ds, ax\r
mov ax, offset _unixbuff\r
mov si, ax\r
\r
; print contents of the buffer\r
\r
cld ; set up for string moves\r
print1: lodsb ; get the character\r
or al, al ; is it end of string?\r
jz done ; yes - exit loop\r
cmp al, LF ; is it end of line?\r
jne print2 ; no - output character as is\r
mov dl, CR ; get carriage return character\r
mov ah, DOS_PUTCHAR ; DOS output char system call number\r
int DOS_SYSCALL ; DOS system call to output char\r
mov al, LF ; set line feed character back in AL\r
print2: mov dl, al ; get character\r
mov ah, DOS_PUTCHAR ; DOS output char system call number\r
int DOS_SYSCALL ; DOS system call to output char\r
jmp print1 ; check for more characters\r
\r
done:\r
; restore registers and flags\r
\r
pop bp\r
pop si\r
pop di\r
pop es\r
pop ds\r
pop dx\r
pop cx\r
pop bx\r
pop ax\r
popf\r
\r
; re-enable interrupts and return\r
\r
sti\r
iret\r
\r
_inthdl endp\r
\r
_TEXT ends\r
\r
end\r
\r