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78 lines
1.3 KiB
78 lines
1.3 KiB
page ,132
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title outp - output from ports
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;***
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;outp.asm - _outp, _outpw and _outpd 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 write-to-a-port functions: _outp(), _outpw() and outpd().
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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 _outp(port, databyte) - write byte from port
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;unsigned short _outpw(port, dataword) - write word from port
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;unsigned long _outpd(port, datadword) - write dword from port
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;
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;Purpose:
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; Write single byte/word/dword to the specified port.
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;
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;Entry:
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; unsigned short port - port to write to
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;
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;Exit:
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; returns value written.
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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 _outp, _outpw, _outpd
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_outp proc
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xor eax,eax
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mov dx,word ptr [esp + 4]
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mov al,byte ptr [esp + 8]
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out dx,al
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ret
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_outp endp
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_outpw proc
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mov dx,word ptr [esp + 4]
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mov ax,word ptr [esp + 8]
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out dx,ax
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ret
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_outpw endp
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_outpd proc
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mov dx,word ptr [esp + 4]
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mov eax,[esp + 8]
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out dx,eax
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ret
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_outpd endp
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end
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