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 */ 186
