libkern/libkern/ppc/OSByteOrder.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * Copyright (c) 1999 Apple Computer, Inc.  All rights reserved.
  32  *
  33  * HISTORY
  34  *
  35  */
  36
  37
  38 #ifndef _OS_OSBYTEORDERPPC_H
  39 #define _OS_OSBYTEORDERPPC_H
  40
  41 #include <stdint.h>
  42
  43 #if !defined(OS_INLINE)
  44 #        define OS_INLINE static inline
  45 #endif
  46
  47 /* Functions for byte reversed loads. */
  48
  49 OS_INLINE
  50 uint16_t
  51 OSReadSwapInt16(
  52     const volatile void               * base,
  53     uintptr_t                          offset
  54 )
  55 {
  56     uint16_t result;
  57     __asm__ volatile("lhbrx %0, %1, %2"
  58                      : "=r" (result)
  59                      : "b%"  (base), "r" (offset)
  60                      : "memory");
  61     return result;
  62 }
  63
  64 OS_INLINE
  65 uint32_t
  66 OSReadSwapInt32(
  67     const volatile void               * base,
  68     uintptr_t                          offset
  69 )
  70 {
  71     uint32_t result;
  72     __asm__ volatile("lwbrx %0, %1, %2"
  73                      : "=r" (result)
  74                      : "b%"  (base), "r" (offset)
  75                      : "memory");
  76     return result;
  77 }
  78
  79 OS_INLINE
  80 uint64_t
  81 OSReadSwapInt64(
  82     const volatile void               * base,
  83     uintptr_t                          offset
  84 )
  85 {
  86     const volatile uint64_t * inp;
  87     union ullc {
  88         uint64_t     ull;
  89         uint32_t     ul[2];
  90     } outv;
  91
  92     inp = (const volatile uint64_t *)base;
  93     outv.ul[0] = OSReadSwapInt32(inp, offset + 4);
  94     outv.ul[1] = OSReadSwapInt32(inp, offset);
  95     return outv.ull;
  96 }
  97
  98 /* Functions for byte reversed stores. */
  99
 100 OS_INLINE
 101 void
 102 OSWriteSwapInt16(
 103     volatile void               * base,
 104     uintptr_t                          offset,
 105     uint16_t                        data
 106 )
 107 {
 108     __asm__ volatile("sthbrx %0, %1, %2"
 109                      :
 110                      : "r" (data), "b%" (base), "r" (offset)
 111                      : "memory");
 112 }
 113
 114 OS_INLINE
 115 void
 116 OSWriteSwapInt32(
 117     volatile void               * base,
 118     uintptr_t                          offset,
 119     uint32_t                        data
 120 )
 121 {
 122     __asm__ volatile("stwbrx %0, %1, %2"
 123                      :
 124                      : "r" (data), "b%" (base), "r" (offset)
 125                      : "memory" );
 126 }
 127
 128 OS_INLINE
 129 void
 130 OSWriteSwapInt64(
 131     volatile void               * base,
 132     uintptr_t                          offset,
 133     uint64_t                        data
 134 )
 135 {
 136     volatile uint64_t * outp;
 137     volatile union ullc {
 138         uint64_t     ull;
 139         uint32_t     ul[2];
 140     } *inp;
 141
 142     outp = (volatile uint64_t *)base;
 143     inp  = (volatile union ullc *)&data;
 144     OSWriteSwapInt32(outp, offset, inp->ul[1]);
 145     OSWriteSwapInt32(outp, offset + 4, inp->ul[0]);
 146 }
 147
 148 /* Generic byte swapping functions. */
 149
 150 OS_INLINE
 151 uint16_t
 152 _OSSwapInt16(
 153     uint16_t                        data
 154 )
 155 {
 156     uint16_t temp = data;
 157     return OSReadSwapInt16(&temp, 0);
 158 }
 159
 160 OS_INLINE
 161 uint32_t
 162 _OSSwapInt32(
 163     uint32_t                        data
 164 )
 165 {
 166     uint32_t temp = data;
 167     return OSReadSwapInt32(&temp, 0);
 168 }
 169
 170 OS_INLINE
 171 uint64_t
 172 _OSSwapInt64(
 173     uint64_t                        data
 174 )
 175 {
 176     uint64_t temp = data;
 177     return OSReadSwapInt64(&temp, 0);
 178 }
 179
 180 #endif /* ! _OS_OSBYTEORDERPPC_H */