libkern/libkern/ppc/OSByteOrder.h

   1 /*
   2  * Copyright (c) 2000 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  * Copyright (c) 1999 Apple Computer, Inc.  All rights reserved.
  30  *
  31  * HISTORY
  32  *
  33  */
  34
  35
  36 #ifndef _OS_OSBYTEORDERPPC_H
  37 #define _OS_OSBYTEORDERPPC_H
  38
  39 #include <stdint.h>
  40
  41 #if !defined(OS_INLINE)
  42 #        define OS_INLINE static inline
  43 #endif
  44
  45 /* Functions for byte reversed loads. */
  46
  47 OS_INLINE
  48 uint16_t
  49 OSReadSwapInt16(
  50     const volatile void               * base,
  51     uintptr_t                          offset
  52 )
  53 {
  54     uint16_t result;
  55     __asm__ volatile("lhbrx %0, %1, %2"
  56                      : "=r" (result)
  57                      : "b%"  (base), "r" (offset)
  58                      : "memory");
  59     return result;
  60 }
  61
  62 OS_INLINE
  63 uint32_t
  64 OSReadSwapInt32(
  65     const volatile void               * base,
  66     uintptr_t                          offset
  67 )
  68 {
  69     uint32_t result;
  70     __asm__ volatile("lwbrx %0, %1, %2"
  71                      : "=r" (result)
  72                      : "b%"  (base), "r" (offset)
  73                      : "memory");
  74     return result;
  75 }
  76
  77 OS_INLINE
  78 uint64_t
  79 OSReadSwapInt64(
  80     const volatile void               * base,
  81     uintptr_t                          offset
  82 )
  83 {
  84     const volatile uint64_t * inp;
  85     union ullc {
  86         uint64_t     ull;
  87         uint32_t     ul[2];
  88     } outv;
  89
  90     inp = (const volatile uint64_t *)base;
  91     outv.ul[0] = OSReadSwapInt32(inp, offset + 4);
  92     outv.ul[1] = OSReadSwapInt32(inp, offset);
  93     return outv.ull;
  94 }
  95
  96 /* Functions for byte reversed stores. */
  97
  98 OS_INLINE
  99 void
 100 OSWriteSwapInt16(
 101     volatile void               * base,
 102     uintptr_t                          offset,
 103     uint16_t                        data
 104 )
 105 {
 106     __asm__ volatile("sthbrx %0, %1, %2"
 107                      :
 108                      : "r" (data), "b%" (base), "r" (offset)
 109                      : "memory");
 110 }
 111
 112 OS_INLINE
 113 void
 114 OSWriteSwapInt32(
 115     volatile void               * base,
 116     uintptr_t                          offset,
 117     uint32_t                        data
 118 )
 119 {
 120     __asm__ volatile("stwbrx %0, %1, %2"
 121                      :
 122                      : "r" (data), "b%" (base), "r" (offset)
 123                      : "memory" );
 124 }
 125
 126 OS_INLINE
 127 void
 128 OSWriteSwapInt64(
 129     volatile void               * base,
 130     uintptr_t                          offset,
 131     uint64_t                        data
 132 )
 133 {
 134     volatile uint64_t * outp;
 135     volatile union ullc {
 136         uint64_t     ull;
 137         uint32_t     ul[2];
 138     } *inp;
 139
 140     outp = (volatile uint64_t *)base;
 141     inp  = (volatile union ullc *)&data;
 142     OSWriteSwapInt32(outp, offset, inp->ul[1]);
 143     OSWriteSwapInt32(outp, offset + 4, inp->ul[0]);
 144 }
 145
 146 /* Generic byte swapping functions. */
 147
 148 OS_INLINE
 149 uint16_t
 150 _OSSwapInt16(
 151     uint16_t                        data
 152 )
 153 {
 154     uint16_t temp = data;
 155     return OSReadSwapInt16(&temp, 0);
 156 }
 157
 158 OS_INLINE
 159 uint32_t
 160 _OSSwapInt32(
 161     uint32_t                        data
 162 )
 163 {
 164     uint32_t temp = data;
 165     return OSReadSwapInt32(&temp, 0);
 166 }
 167
 168 OS_INLINE
 169 uint64_t
 170 _OSSwapInt64(
 171     uint64_t                        data
 172 )
 173 {
 174     uint64_t temp = data;
 175     return OSReadSwapInt64(&temp, 0);
 176 }
 177
 178 #endif /* ! _OS_OSBYTEORDERPPC_H */