42 lines
567 B
NASM
42 lines
567 B
NASM
; out ds:si copy of interrupt table
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ivt_backup:
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push ax
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push cx
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push di ; backup original value
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push ds
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mov ax, 0x80
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call malloc
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push di
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mov cx, 0x80
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mov ax, cs
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mov es, ax
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mov si, 0x0000
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mov ds, si
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rep movsb
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pop si ; this was di after malloc
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pop ds
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pop di ; restore original di
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pop cx
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pop ax
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ret
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; set item in interrupt vector table
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; in: bx interrupt number
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; ds:dx new handler address
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ivt_set:
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push es
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push ax
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xor ax,ax
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mov es,ax
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sal bx,1
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sal bx,1
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mov [es:bx], dx
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mov [es:bx+2], ds
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pop ax
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pop es
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ret
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