openwrt/package/linux/kernel-source/include/bcmendian.h

   1 /*
   2  * local version of endian.h - byte order defines
   3  *
   4  * Copyright 2004, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   8  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   9  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  10  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  11  *
  12  *  $Id$
  13 */
  14
  15 #ifndef _BCMENDIAN_H_
  16 #define _BCMENDIAN_H_
  17
  18 #include <typedefs.h>
  19
  20 /* Byte swap a 16 bit value */
  21 #define BCMSWAP16(val) \
  22         ((uint16)( \
  23                 (((uint16)(val) & (uint16)0x00ffU) << 8) | \
  24                 (((uint16)(val) & (uint16)0xff00U) >> 8) ))
  25
  26 /* Byte swap a 32 bit value */
  27 #define BCMSWAP32(val) \
  28         ((uint32)( \
  29                 (((uint32)(val) & (uint32)0x000000ffUL) << 24) | \
  30                 (((uint32)(val) & (uint32)0x0000ff00UL) <<  8) | \
  31                 (((uint32)(val) & (uint32)0x00ff0000UL) >>  8) | \
  32                 (((uint32)(val) & (uint32)0xff000000UL) >> 24) ))
  33
  34 static INLINE uint16
  35 bcmswap16(uint16 val)
  36 {
  37         return BCMSWAP16(val);
  38 }
  39
  40 static INLINE uint32
  41 bcmswap32(uint32 val)
  42 {
  43         return BCMSWAP32(val);
  44 }
  45
  46 /* buf  - start of buffer of shorts to swap */
  47 /* len  - byte length of buffer */
  48 static INLINE void
  49 bcmswap16_buf(uint16 *buf, uint len)
  50 {
  51         len = len/2;
  52
  53         while(len--){
  54                 *buf = bcmswap16(*buf);
  55                 buf++;
  56         }
  57 }
  58
  59 #ifndef hton16
  60 #ifndef IL_BIGENDIAN
  61 #define HTON16(i) BCMSWAP16(i)
  62 #define hton16(i) bcmswap16(i)
  63 #define hton32(i) bcmswap32(i)
  64 #define ntoh16(i) bcmswap16(i)
  65 #define ntoh32(i) bcmswap32(i)
  66 #define ltoh16(i) (i)
  67 #define ltoh32(i) (i)
  68 #define htol16(i) (i)
  69 #define htol32(i) (i)
  70 #else
  71 #define HTON16(i) (i)
  72 #define hton16(i) (i)
  73 #define hton32(i) (i)
  74 #define ntoh16(i) (i)
  75 #define ntoh32(i) (i)
  76 #define ltoh16(i) bcmswap16(i)
  77 #define ltoh32(i) bcmswap32(i)
  78 #define htol16(i) bcmswap16(i)
  79 #define htol32(i) bcmswap32(i)
  80 #endif
  81 #endif
  82
  83 #ifndef IL_BIGENDIAN
  84 #define ltoh16_buf(buf, i)
  85 #define htol16_buf(buf, i)
  86 #else
  87 #define ltoh16_buf(buf, i) bcmswap16_buf((uint16*)buf, i)
  88 #define htol16_buf(buf, i) bcmswap16_buf((uint16*)buf, i)
  89 #endif
  90
  91 /*
  92 * load 16-bit value from unaligned little endian byte array.
  93 */
  94 static INLINE uint16
  95 ltoh16_ua(uint8 *bytes)
  96 {
  97         return (bytes[1]<<8)+bytes[0];
  98 }
  99
 100 /*
 101 * load 32-bit value from unaligned little endian byte array.
 102 */
 103 static INLINE uint32
 104 ltoh32_ua(uint8 *bytes)
 105 {
 106         return (bytes[3]<<24)+(bytes[2]<<16)+(bytes[1]<<8)+bytes[0];
 107 }
 108
 109 /*
 110 * load 16-bit value from unaligned big(network) endian byte array.
 111 */
 112 static INLINE uint16
 113 ntoh16_ua(uint8 *bytes)
 114 {
 115         return (bytes[0]<<8)+bytes[1];
 116 }
 117
 118 /*
 119 * load 32-bit value from unaligned big(network) endian byte array.
 120 */
 121 static INLINE uint32
 122 ntoh32_ua(uint8 *bytes)
 123 {
 124         return (bytes[0]<<24)+(bytes[1]<<16)+(bytes[2]<<8)+bytes[3];
 125 }
 126
 127 #endif /* _BCMENDIAN_H_ */