i386/libsaio/io_inline.h

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