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 */ 182
