sysdeps/unix/sysv/linux/x86/sys/io.h

   1 /* Copyright (C) 1996-2021 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _SYS_IO_H
  19 #define _SYS_IO_H       1
  20
  21 #include <features.h>
  22
  23 __BEGIN_DECLS
  24
  25 /* If TURN_ON is TRUE, request for permission to do direct i/o on the
  26    port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
  27    permission off for that range.  This call requires root privileges.
  28
  29    Portability note: not all Linux platforms support this call.  Most
  30    platforms based on the PC I/O architecture probably will, however.
  31    E.g., Linux/Alpha for Alpha PCs supports this.  */
  32 extern int ioperm (unsigned long int __from, unsigned long int __num,
  33                    int __turn_on) __THROW;
  34
  35 /* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
  36    access any I/O port is granted.  This call requires root
  37    privileges. */
  38 extern int iopl (int __level) __THROW;
  39
  40 #if defined __GNUC__ && __GNUC__ >= 2
  41
  42 static __inline unsigned char
  43 inb (unsigned short int __port)
  44 {
  45   unsigned char _v;
  46
  47   __asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"Nd" (__port));
  48   return _v;
  49 }
  50
  51 static __inline unsigned char
  52 inb_p (unsigned short int __port)
  53 {
  54   unsigned char _v;
  55
  56   __asm__ __volatile__ ("inb %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));
  57   return _v;
  58 }
  59
  60 static __inline unsigned short int
  61 inw (unsigned short int __port)
  62 {
  63   unsigned short _v;
  64
  65   __asm__ __volatile__ ("inw %w1,%0":"=a" (_v):"Nd" (__port));
  66   return _v;
  67 }
  68
  69 static __inline unsigned short int
  70 inw_p (unsigned short int __port)
  71 {
  72   unsigned short int _v;
  73
  74   __asm__ __volatile__ ("inw %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));
  75   return _v;
  76 }
  77
  78 static __inline unsigned int
  79 inl (unsigned short int __port)
  80 {
  81   unsigned int _v;
  82
  83   __asm__ __volatile__ ("inl %w1,%0":"=a" (_v):"Nd" (__port));
  84   return _v;
  85 }
  86
  87 static __inline unsigned int
  88 inl_p (unsigned short int __port)
  89 {
  90   unsigned int _v;
  91   __asm__ __volatile__ ("inl %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (__port));
  92   return _v;
  93 }
  94
  95 static __inline void
  96 outb (unsigned char __value, unsigned short int __port)
  97 {
  98   __asm__ __volatile__ ("outb %b0,%w1": :"a" (__value), "Nd" (__port));
  99 }
 100
 101 static __inline void
 102 outb_p (unsigned char __value, unsigned short int __port)
 103 {
 104   __asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80": :"a" (__value),
 105                         "Nd" (__port));
 106 }
 107
 108 static __inline void
 109 outw (unsigned short int __value, unsigned short int __port)
 110 {
 111   __asm__ __volatile__ ("outw %w0,%w1": :"a" (__value), "Nd" (__port));
 112
 113 }
 114
 115 static __inline void
 116 outw_p (unsigned short int __value, unsigned short int __port)
 117 {
 118   __asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80": :"a" (__value),
 119                         "Nd" (__port));
 120 }
 121
 122 static __inline void
 123 outl (unsigned int __value, unsigned short int __port)
 124 {
 125   __asm__ __volatile__ ("outl %0,%w1": :"a" (__value), "Nd" (__port));
 126 }
 127
 128 static __inline void
 129 outl_p (unsigned int __value, unsigned short int __port)
 130 {
 131   __asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80": :"a" (__value),
 132                         "Nd" (__port));
 133 }
 134
 135 static __inline void
 136 insb (unsigned short int __port, void *__addr, unsigned long int __count)
 137 {
 138   __asm__ __volatile__ ("cld ; rep ; insb":"=D" (__addr), "=c" (__count)
 139                         :"d" (__port), "0" (__addr), "1" (__count));
 140 }
 141
 142 static __inline void
 143 insw (unsigned short int __port, void *__addr, unsigned long int __count)
 144 {
 145   __asm__ __volatile__ ("cld ; rep ; insw":"=D" (__addr), "=c" (__count)
 146                         :"d" (__port), "0" (__addr), "1" (__count));
 147 }
 148
 149 static __inline void
 150 insl (unsigned short int __port, void *__addr, unsigned long int __count)
 151 {
 152   __asm__ __volatile__ ("cld ; rep ; insl":"=D" (__addr), "=c" (__count)
 153                         :"d" (__port), "0" (__addr), "1" (__count));
 154 }
 155
 156 static __inline void
 157 outsb (unsigned short int __port, const void *__addr,
 158        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,
 166        unsigned long int __count)
 167 {
 168   __asm__ __volatile__ ("cld ; rep ; outsw":"=S" (__addr), "=c" (__count)
 169                         :"d" (__port), "0" (__addr), "1" (__count));
 170 }
 171
 172 static __inline void
 173 outsl (unsigned short int __port, const void *__addr,
 174        unsigned long int __count)
 175 {
 176   __asm__ __volatile__ ("cld ; rep ; outsl":"=S" (__addr), "=c" (__count)
 177                         :"d" (__port), "0" (__addr), "1" (__count));
 178 }
 179
 180 #endif  /* GNU C */
 181
 182 __END_DECLS
 183 #endif /* _SYS_IO_H */