Leaked source code of windows server 2003
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page ,132 title inp - input from ports;***;inp.asm - _inp, _inpw and _inpd routines;; Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved.;;Purpose:; Defines the read-from-a-port functions: _inp(), _inpw() and inpd().;;Revision History:; 04-09-93 GJF Resurrected.; 04-13-93 GJF Arg/ret types changed slightly.;;*******************************************************************************
.xlist include cruntime.inc .list
page;***;int _inp(port) - read byte from port;unsigned short _inpw(port) - read word from port;unsigned long _inpd(port) - read dword from port;;Purpose:; Read single byte/word/dword from the specified port.;;Entry:; unsigned short port - port to read from;;Exit:; returns value read.;;Uses:; EAX, EDX;;Exceptions:;;*******************************************************************************
CODESEG
public _inp, _inpw, _inpd
_inp proc
xor eax,eax mov dx,word ptr [esp + 4] in al,dx ret
_inp endp
_inpw proc
mov dx,word ptr [esp + 4] in ax,dx ret
_inpw endp
_inpd proc
mov dx,word ptr [esp + 4] in eax,dx ret
_inpd endp
end
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