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The LXR Cross Referencer for SOS

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001 /* Copyright (C) 2004  All GPL'ed OS
002    Copyright (C) 1999  Free Software Foundation, Inc.
003 
004    This program is free software; you can redistribute it and/or
005    modify it under the terms of the GNU General Public License
006    as published by the Free Software Foundation; either version 2
007    of the License, or (at your option) any later version.
008    
009    This program is distributed in the hope that it will be useful,
010    but WITHOUT ANY WARRANTY; without even the implied warranty of
011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012    GNU General Public License for more details.
013    
014    You should have received a copy of the GNU General Public License
015    along with this program; if not, write to the Free Software
016    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
017    USA. 
018 */
019 #ifndef _SOS_IOPORTS_H_
020 #define _SOS_IOPORTS_H_
021 
022 /**
023  * @ioports.h
024  *
025  * Intel-specific I/O space access routines.
026  */
027 
028 /* This macro allows to write to an I/O port */
029 #define outb(value, port)                                       \
030   __asm__ volatile (                                            \
031         "outb %b0,%w1"                                          \
032         ::"a" (value),"Nd" (port)                               \
033         )                                                       \
034 
035 // read one byte from port
036 #define inb(port)                                               \
037 ({                                                              \
038   unsigned char _v;                                             \
039   __asm__ volatile (                                            \
040         "inb %w1,%0"                                            \
041         :"=a" (_v)                                              \
042         :"Nd" (port)                                            \
043         );                                                      \
044   _v;                                                           \
045 })
046 
047 #endif /* _SOS_IOPORTS_H_ */

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