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Differences between /hwcore/ioports.h (Article 6) and /hwcore/ioports.h (Article 7)


001 /* Copyright (C) 2004  All GPL'ed OS              001 /* Copyright (C) 2004  All GPL'ed OS
002    Copyright (C) 1999  Free Software Foundatio << 
003                                                   002 
004    This program is free software; you can redi    003    This program is free software; you can redistribute it and/or
005    modify it under the terms of the GNU Genera    004    modify it under the terms of the GNU General Public License
006    as published by the Free Software Foundatio    005    as published by the Free Software Foundation; either version 2
007    of the License, or (at your option) any lat    006    of the License, or (at your option) any later version.
008                                                   007    
009    This program is distributed in the hope tha    008    This program is distributed in the hope that it will be useful,
010    but WITHOUT ANY WARRANTY; without even the     009    but WITHOUT ANY WARRANTY; without even the implied warranty of
011    MERCHANTABILITY or FITNESS FOR A PARTICULAR    010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012    GNU General Public License for more details    011    GNU General Public License for more details.
013                                                   012    
014    You should have received a copy of the GNU     013    You should have received a copy of the GNU General Public License
015    along with this program; if not, write to t    014    along with this program; if not, write to the Free Software
016    Foundation, Inc., 59 Temple Place - Suite 3    015    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
017    USA.                                           016    USA. 
018 */                                                017 */
019 #ifndef _SOS_IOPORTS_H_                           018 #ifndef _SOS_IOPORTS_H_
020 #define _SOS_IOPORTS_H_                           019 #define _SOS_IOPORTS_H_
021                                                   020 
022 /**                                               021 /**
023  * @ioports.h                                     022  * @ioports.h
024  *                                                023  *
025  * Intel-specific I/O space access routines.      024  * Intel-specific I/O space access routines.
026  */                                               025  */
027                                                   026 
028 /* This macro allows to write to an I/O port *    027 /* This macro allows to write to an I/O port */
029 #define outb(value, port)                         028 #define outb(value, port)                                       \
030   __asm__ volatile (                              029   __asm__ volatile (                                            \
031         "outb %b0,%w1"                            030         "outb %b0,%w1"                                          \
032         ::"a" (value),"Nd" (port)                 031         ::"a" (value),"Nd" (port)                               \
033         )                                         032         )                                                       \
034                                                   033 
035 // read one byte from port                        034 // read one byte from port
036 #define inb(port)                                 035 #define inb(port)                                               \
037 ({                                                036 ({                                                              \
038   unsigned char _v;                               037   unsigned char _v;                                             \
039   __asm__ volatile (                              038   __asm__ volatile (                                            \
040         "inb %w1,%0"                              039         "inb %w1,%0"                                            \
041         :"=a" (_v)                                040         :"=a" (_v)                                              \
042         :"Nd" (port)                              041         :"Nd" (port)                                            \
043         );                                        042         );                                                      \
044   _v;                                             043   _v;                                                           \
045 })                                                044 })
046                                                   045 
047 #endif /* _SOS_IOPORTS_H_ */                      046 #endif /* _SOS_IOPORTS_H_ */
                                                      

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