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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/sys/io.h


$ cat -n /usr/include/x86_64-linux-gnu/sys/io.h

     1	/* Copyright (C) 1996-2024 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 */