81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
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/* -*- Mode: C; c-basic-offset: 3 -*-
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*
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* io.h - Simple IA32 I/O macros
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*
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* This file is part of Metalkit, a simple collection of modules for
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* writing software that runs on the bare metal. Get the latest code
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* at http://svn.navi.cx/misc/trunk/metalkit/
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*
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* Copyright (c) 2008-2009 Micah Dowty
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __IO_H__
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#define __IO_H__
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#include "types.h"
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static __inline__ void
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IO_Out8(uint16 port, uint8 value)
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{
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__asm__ __volatile__ ("outb %0, %1" : :"a" (value), "d" (port));
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}
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static __inline__ void
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IO_Out16(uint16 port, uint16 value)
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{
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__asm__ __volatile__ ("outw %0, %1" : :"a" (value), "d" (port));
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}
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static __inline__ void
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IO_Out32(uint16 port, uint32 value)
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{
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__asm__ __volatile__ ("outl %0, %1" : :"a" (value), "d" (port));
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}
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static __inline__ uint8
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IO_In8(uint16 port)
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{
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uint8 value;
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__asm__ __volatile__ ("inb %1, %0" :"=a" (value) :"d" (port));
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return value;
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}
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static __inline__ uint16
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IO_In16(uint16 port)
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{
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uint16 value;
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__asm__ __volatile__ ("inw %1, %0" :"=a" (value) :"d" (port));
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return value;
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}
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static __inline__ uint32
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IO_In32(uint16 port)
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{
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uint32 value;
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__asm__ __volatile__ ("inl %1, %0" :"=a" (value) :"d" (port));
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return value;
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}
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#endif /* __IO_H__ */
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