i386/libsaio/io_inline.h

   1 /*
   2  * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 2.0 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1992 NeXT Computer, Inc.
  26  *
  27  * Inlines for io space access.
  28  *
  29  * HISTORY
  30  *
  31  * 20 May 1992 ? at NeXT
  32  *      Created.
  33  */
  34
  35 #ifndef __LIBSAIO_IO_INLINE_H
  36 #define __LIBSAIO_IO_INLINE_H
  37
  38 /*
  39  *############################################################################
  40  *
  41  * x86 IN/OUT I/O inline functions.
  42  *
  43  * IN :  inb, inw, inl
  44  *       IN(port)
  45  *
  46  * OUT:  outb, outw, outl
  47  *       OUT(port, data)
  48  *
  49  *############################################################################
  50  */
  51
  52 #define __IN(s, u)                            \
  53 static inline unsigned u                      \
  54 in##s(unsigned short port)                    \
  55 {                                             \
  56     unsigned u data;                          \
  57     asm volatile (                            \
  58         "in" #s " %1,%0"                      \
  59                 : "=a" (data)                         \
  60                 : "d" (port));                        \
  61     return (data);                            \
  62 }
  63
  64 #define __OUT(s, u)                           \
  65 static inline void                            \
  66 out##s(unsigned short port, unsigned u data)  \
  67 {                                             \
  68     asm volatile (                            \
  69         "out" #s " %1,%0"                     \
  70                 :                                     \
  71                 : "d" (port), "a" (data));            \
  72 }
  73
  74 __IN(b, char)    /* inb() */
  75 __IN(w, short)   /* inw() */
  76 __IN(l, long)    /* inl() */
  77
  78 __OUT(b, char)   /* outb() */
  79 __OUT(w, short)  /* outw() */
  80 __OUT(l, long)   /* outl() */
  81
  82 #endif /* !__LIBSAIO_IO_INLINE_H */