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  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  *  bswap.c - Endian Swapping functions.
  24  *
  25  *  Copyright (c) 2000 Apple Computer, Inc.
  26  *
  27  *  DRI: Josh de Cesare
  28  */
  29
  30 #include <libclite.h>
  31
  32 int16_t bswap16(int16_t data)
  33 {
  34   int16_t tmpData;
  35
  36   __asm__ volatile("sthbrx %0, 0, %1" : : "r" (data), "r" (&tmpData));
  37
  38   return tmpData;
  39 }
  40
  41 int32_t bswap32(int32_t data)
  42 {
  43   int32_t tmpData;
  44
  45   __asm__ volatile("stwbrx %0, 0, %1" : : "r" (data), "r" (&tmpData));
  46
  47   return tmpData;
  48 }