2019-09-10 23:38:52 +02:00
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; Register a interrupt handler (21h AH=25h)
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; in: AL interrupt number
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; DS:DX far ptr
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isr_intr_register:
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; backup previous stos ptr
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push es
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push di
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; DI = AL * 4
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mov ah, 4
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mul ah
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mov di, ax
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; ES = 0
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xor ax, ax
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mov es, ax
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; store offset
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mov ax, dx
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stosw
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; store segment
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mov ax, ds
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stosw
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; restore previous stos ptr
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pop di
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pop es
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iret
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