sysdeps/unix/sysv/linux/i386/sys/io.h

   1 /* Copyright (C) 1996, 2000, 2009 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _SYS_IO_H
  20 #define _SYS_IO_H       1
  21
  22 #include <features.h>
  23
  24 __BEGIN_DECLS
  25
  26 /* If TURN_ON is TRUE, request for permission to do direct i/o on the
  27    port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
  28    permission off for that range.  This call requires root privileges.
  29
  30    Portability note: not all Linux platforms support this call.  Most
  31    platforms based on the PC I/O architecture probably will, however.
  32    E.g., Linux/Alpha for Alpha PCs supports this.  */
  33 extern int ioperm (unsigned long int __from, unsigned long int __num,
  34                    int __turn_on) __THROW;
  35
  36 /* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
  37    access any I/O port is granted.  This call requires root
  38    privileges. */
  39 extern int iopl (int __level) __THROW;
  40
  41 #if defined __GNUC__ && __GNUC__ >= 2
  42
  43 static __inline unsigned char
  44 inb (unsigned short int __port)
  45 {
  46   unsigned char _v;
  47
  48   __asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"Nd" (__port));
  49   return _v;
  50 }
  51
  52 static __inline unsigned char
  53 inb_p (unsigned short int __port)
  54 {
  55   unsigned char _v;
  56
  57   __asm__ __volatile__ ("inb %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));
  58   return _v;
  59 }
  60
  61 static __inline unsigned short int
  62 inw (unsigned short int __port)
  63 {
  64   unsigned short _v;
  65
  66   __asm__ __volatile__ ("inw %w1,%0":"=a" (_v):"Nd" (__port));
  67   return _v;
  68 }
  69
  70 static __inline unsigned short int
  71 inw_p (unsigned short int __port)
  72 {
  73   unsigned short int _v;
  74
  75   __asm__ __volatile__ ("inw %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));
  76   return _v;
  77 }
  78
  79 static __inline unsigned int
  80 inl (unsigned short int __port)
  81 {
  82   unsigned int _v;
  83
  84   __asm__ __volatile__ ("inl %w1,%0":"=a" (_v):"Nd" (__port));
  85   return _v;
  86 }
  87
  88 static __inline unsigned int
  89 inl_p (unsigned short int __port)
  90 {
  91   unsigned int _v;
  92   __asm__ __volatile__ ("inl %w1,%0\noutb %%al,$0x80":"=a" (_v)
  93                         :"Nd" (__port));
  94   return _v;
  95 }
  96
  97 static __inline void
  98 outb (unsigned char value, unsigned short int __port)
  99 {
 100   __asm__ __volatile__ ("outb %b0,%w1": :"a" (value), "Nd" (__port));
 101 }
 102
 103 static __inline void
 104 outb_p (unsigned char value, unsigned short int __port)
 105 {
 106   __asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80": :"a" (value),
 107                         "Nd" (__port));
 108 }
 109
 110 static __inline void
 111 outw (unsigned short int value, unsigned short int __port)
 112 {
 113   __asm__ __volatile__ ("outw %w0,%w1": :"a" (value), "Nd" (__port));
 114
 115 }
 116
 117 static __inline void
 118 outw_p (unsigned short int value, unsigned short int __port)
 119 {
 120   __asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80": :"a" (value),
 121                         "Nd" (__port));
 122 }
 123
 124 static __inline void
 125 outl (unsigned int value, unsigned short int __port)
 126 {
 127   __asm__ __volatile__ ("outl %0,%w1": :"a" (value), "Nd" (__port));
 128 }
 129
 130 static __inline void
 131 outl_p (unsigned int value, unsigned short int __port)
 132 {
 133   __asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80": :"a" (value),
 134                         "Nd" (__port));
 135 }
 136
 137 static __inline void
 138 insb (unsigned short int __port, void *__addr, unsigned long int __count)
 139 {
 140   __asm__ __volatile__ ("cld ; rep ; insb":"=D" (__addr), "=c" (__count)
 141                         :"d" (__port), "0" (__addr), "1" (__count));
 142 }
 143
 144 static __inline void
 145 insw (unsigned short int __port, void *__addr, unsigned long int __count)
 146 {
 147   __asm__ __volatile__ ("cld ; rep ; insw":"=D" (__addr), "=c" (__count)
 148                         :"d" (__port), "0" (__addr), "1" (__count));
 149 }
 150
 151 static __inline void
 152 insl (unsigned short int __port, void *__addr, unsigned long int __count)
 153 {
 154   __asm__ __volatile__ ("cld ; rep ; insl":"=D" (__addr), "=c" (__count)
 155                         :"d" (__port), "0" (__addr), "1" (__count));
 156 }
 157
 158 static __inline void
 159 outsb (unsigned short int __port, const void *__addr,
 160        unsigned long int __count)
 161 {
 162   __asm__ __volatile__ ("cld ; rep ; outsb":"=S" (__addr), "=c" (__count)
 163                         :"d" (__port), "0" (__addr), "1" (__count));
 164 }
 165
 166 static __inline void
 167 outsw (unsigned short int __port, const void *__addr,
 168        unsigned long int __count)
 169 {
 170   __asm__ __volatile__ ("cld ; rep ; outsw":"=S" (__addr), "=c" (__count)
 171                         :"d" (__port), "0" (__addr), "1" (__count));
 172 }
 173
 174 static __inline void
 175 outsl (unsigned short int __port, const void *__addr,
 176        unsigned long int __count)
 177 {
 178   __asm__ __volatile__ ("cld ; rep ; outsl":"=S" (__addr), "=c" (__count)
 179                         :"d" (__port), "0" (__addr), "1" (__count));
 180 }
 181
 182 #endif  /* GNU C */
 183
 184 __END_DECLS
 185 #endif /* _SYS_IO_H */