75 lines
1.1 KiB
NASM
75 lines
1.1 KiB
NASM
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page ,132
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title inp - input from ports
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;***
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;inp.asm - _inp, _inpw and _inpd routines
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;
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; Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved.
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;
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;Purpose:
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; Defines the read-from-a-port functions: _inp(), _inpw() and inpd().
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;
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;Revision History:
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; 04-09-93 GJF Resurrected.
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; 04-13-93 GJF Arg/ret types changed slightly.
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;
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;*******************************************************************************
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.xlist
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include cruntime.inc
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.list
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page
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;***
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;int _inp(port) - read byte from port
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;unsigned short _inpw(port) - read word from port
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;unsigned long _inpd(port) - read dword from port
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;
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;Purpose:
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; Read single byte/word/dword from the specified port.
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;
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;Entry:
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; unsigned short port - port to read from
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;
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;Exit:
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; returns value read.
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;
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;Uses:
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; EAX, EDX
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;
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;Exceptions:
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;
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;*******************************************************************************
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CODESEG
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public _inp, _inpw, _inpd
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_inp proc
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xor eax,eax
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mov dx,word ptr [esp + 4]
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in al,dx
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ret
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_inp endp
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_inpw proc
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mov dx,word ptr [esp + 4]
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in ax,dx
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ret
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_inpw endp
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_inpd proc
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mov dx,word ptr [esp + 4]
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in eax,dx
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ret
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_inpd endp
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end
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