sysdeps/unix/sysv/linux/x86_64/sys/io.h

   1 /* Copyright (C) 1996, 2000, 2002, 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):"Nd" (__port));
  93   return _v;
  94 }
  95
  96 static __inline void
  97 outb (unsigned char __value, unsigned short int __port)
  98 {
  99   __asm__ __volatile__ ("outb %b0,%w1": :"a" (__value), "Nd" (__port));
 100 }
 101
 102 static __inline void
 103 outb_p (unsigned char __value, unsigned short int __port)
 104 {
 105   __asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80": :"a" (__value),
 106                         "Nd" (__port));
 107 }
 108
 109 static __inline void
 110 outw (unsigned short int __value, unsigned short int __port)
 111 {
 112   __asm__ __volatile__ ("outw %w0,%w1": :"a" (__value), "Nd" (__port));
 113
 114 }
 115
 116 static __inline void
 117 outw_p (unsigned short int __value, unsigned short int __port)
 118 {
 119   __asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80": :"a" (__value),
 120                         "Nd" (__port));
 121 }
 122
 123 static __inline void
 124 outl (unsigned int __value, unsigned short int __port)
 125 {
 126   __asm__ __volatile__ ("outl %0,%w1": :"a" (__value), "Nd" (__port));
 127 }
 128
 129 static __inline void
 130 outl_p (unsigned int __value, unsigned short int __port)
 131 {
 132   __asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80": :"a" (__value),
 133                         "Nd" (__port));
 134 }
 135
 136 static __inline void
 137 insb (unsigned short int __port, void *addr, unsigned long int __count)
 138 {
 139   __asm__ __volatile__ ("cld ; rep ; insb":"=D" (addr), "=c" (__count)
 140                         :"d" (__port), "0" (addr), "1" (__count));
 141 }
 142
 143 static __inline void
 144 insw (unsigned short int __port, void *addr, unsigned long int __count)
 145 {
 146   __asm__ __volatile__ ("cld ; rep ; insw":"=D" (addr), "=c" (__count)
 147                         :"d" (__port), "0" (addr), "1" (__count));
 148 }
 149
 150 static __inline void
 151 insl (unsigned short int __port, void *addr, unsigned long int __count)
 152 {
 153   __asm__ __volatile__ ("cld ; rep ; insl":"=D" (addr), "=c" (__count)
 154                         :"d" (__port), "0" (addr), "1" (__count));
 155 }
 156
 157 static __inline void
 158 outsb (unsigned short int __port, const void *addr, unsigned long int __count)
 159 {
 160   __asm__ __volatile__ ("cld ; rep ; outsb":"=S" (addr), "=c" (__count)
 161                         :"d" (__port), "0" (addr), "1" (__count));
 162 }
 163
 164 static __inline void
 165 outsw (unsigned short int __port, const void *addr, unsigned long int __count)
 166 {
 167   __asm__ __volatile__ ("cld ; rep ; outsw":"=S" (addr), "=c" (__count)
 168                         :"d" (__port), "0" (addr), "1" (__count));
 169 }
 170
 171 static __inline void
 172 outsl (unsigned short int __port, const void *addr, unsigned long int __count)
 173 {
 174   __asm__ __volatile__ ("cld ; rep ; outsl":"=S" (addr), "=c" (__count)
 175                         :"d" (__port), "0" (addr), "1" (__count));
 176 }
 177
 178 #endif  /* GNU C */
 179
 180 __END_DECLS
 181 #endif /* _SYS_IO_H */