libkern/libkern/i386/OSByteOrder.h

   1 /*
   2  * Copyright (c) 1999-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef _OS_OSBYTEORDERI386_H
  30 #define _OS_OSBYTEORDERI386_H
  31
  32 #include <stdint.h>
  33 #include <libkern/i386/_OSByteOrder.h>
  34
  35 #if !defined(OS_INLINE)
  36 #define OS_INLINE       __DARWIN_OS_INLINE
  37 #endif
  38
  39 /* Functions for byte reversed loads. */
  40
  41 OS_INLINE
  42 uint16_t
  43 OSReadSwapInt16(
  44     const volatile void   * base,
  45     uintptr_t       byteOffset
  46 )
  47 {
  48     uint16_t result;
  49
  50     result = *(volatile uint16_t *)((uintptr_t)base + byteOffset);
  51     return _OSSwapInt16(result);
  52 }
  53
  54 OS_INLINE
  55 uint32_t
  56 OSReadSwapInt32(
  57     const volatile void   * base,
  58     uintptr_t       byteOffset
  59 )
  60 {
  61     uint32_t result;
  62
  63     result = *(volatile uint32_t *)((uintptr_t)base + byteOffset);
  64     return _OSSwapInt32(result);
  65 }
  66
  67 OS_INLINE
  68 uint64_t
  69 OSReadSwapInt64(
  70     const volatile void   * base,
  71     uintptr_t       byteOffset
  72 )
  73 {
  74     uint64_t result;
  75
  76     result = *(volatile uint64_t *)((uintptr_t)base + byteOffset);
  77     return _OSSwapInt64(result);
  78 }
  79
  80 /* Functions for byte reversed stores. */
  81
  82 OS_INLINE
  83 void
  84 OSWriteSwapInt16(
  85     volatile void   * base,
  86     uintptr_t       byteOffset,
  87     uint16_t        data
  88 )
  89 {
  90     *(volatile uint16_t *)((uintptr_t)base + byteOffset) = _OSSwapInt16(data);
  91 }
  92
  93 OS_INLINE
  94 void
  95 OSWriteSwapInt32(
  96     volatile void   * base,
  97     uintptr_t       byteOffset,
  98     uint32_t        data
  99 )
 100 {
 101     *(volatile uint32_t *)((uintptr_t)base + byteOffset) = _OSSwapInt32(data);
 102 }
 103
 104 OS_INLINE
 105 void
 106 OSWriteSwapInt64(
 107     volatile void    * base,
 108     uintptr_t        byteOffset,
 109     uint64_t         data
 110 )
 111 {
 112     *(volatile uint64_t *)((uintptr_t)base + byteOffset) = _OSSwapInt64(data);
 113 }
 114
 115 #endif /* ! _OS_OSBYTEORDERI386_H */