page ,132
title inp - input from ports
;***
;inp.asm - _inp, _inpw and _inpd routines
;
; Copyright (c) 1993-1997, Microsoft Corporation. All rights reserved.
;
;Purpose:
; Defines the read-from-a-port functions: _inp(), _inpw() and inpd().
;
;*******************************************************************************
.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
