bootx.tproj/libclite.subproj/bswap.c

   1 /*
   2  * Copyright (c) 2000 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  *  bswap.c - Endian Swapping functions.
  27  *
  28  *  Copyright (c) 2000 Apple Computer, Inc.
  29  *
  30  *  DRI: Josh de Cesare
  31  */
  32
  33 #include <libclite.h>
  34
  35 int16_t bswap16(int16_t data)
  36 {
  37   int16_t tmpData;
  38
  39   __asm__ volatile("sthbrx %0, 0, %1" : : "r" (data), "r" (&tmpData));
  40
  41   return tmpData;
  42 }
  43
  44 int32_t bswap32(int32_t data)
  45 {
  46   int32_t tmpData;
  47
  48   __asm__ volatile("stwbrx %0, 0, %1" : : "r" (data), "r" (&tmpData));
  49
  50   return tmpData;
  51 }