LXR uboot/include/linux/bitrev.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_BITREV_H
   3#define _LINUX_BITREV_H
   4
   5#include <linux/types.h>
   6
   7#ifdef CONFIG_HAVE_ARCH_BITREVERSE
   8#include <asm/bitrev.h>
   9
  10#define __bitrev32 __arch_bitrev32
  11#define __bitrev16 __arch_bitrev16
  12#define __bitrev8 __arch_bitrev8
  13
  14#else
  15extern u8 const byte_rev_table[256];
  16static inline u8 __bitrev8(u8 byte)
  17{
  18        return byte_rev_table[byte];
  19}
  20
  21static inline u16 __bitrev16(u16 x)
  22{
  23        return (__bitrev8(x & 0xff) << 8) | __bitrev8(x >> 8);
  24}
  25
  26static inline u32 __bitrev32(u32 x)
  27{
  28        return (__bitrev16(x & 0xffff) << 16) | __bitrev16(x >> 16);
  29}
  30
  31#endif /* CONFIG_HAVE_ARCH_BITREVERSE */
  32
  33#define __bitrev8x4(x)  (__bitrev32(swab32(x)))
  34
  35#define __constant_bitrev32(x)          \
  36({                                      \
  37        u32 __x = x;                    \
  38        __x = (__x >> 16) | (__x << 16);\
  39        __x = ((__x & (u32)0xFF00FF00UL) >> 8) | ((__x & (u32)0x00FF00FFUL) << 8);      \
  40        __x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4);      \
  41        __x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2);      \
  42        __x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1);      \
  43        __x;                            \
  44})
  45
  46#define __constant_bitrev16(x)          \
  47({                                      \
  48        u16 __x = x;                    \
  49        __x = (__x >> 8) | (__x << 8);  \
  50        __x = ((__x & (u16)0xF0F0U) >> 4) | ((__x & (u16)0x0F0FU) << 4); \
  51        __x = ((__x & (u16)0xCCCCU) >> 2) | ((__x & (u16)0x3333U) << 2); \
  52        __x = ((__x & (u16)0xAAAAU) >> 1) | ((__x & (u16)0x5555U) << 1); \
  53        __x;                            \
  54})
  55
  56#define __constant_bitrev8x4(x)         \
  57({                                      \
  58        u32 __x = x;                    \
  59        __x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4);      \
  60        __x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2);      \
  61        __x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1);      \
  62        __x;                            \
  63})
  64
  65#define __constant_bitrev8(x)           \
  66({                                      \
  67        u8 __x = x;                     \
  68        __x = (__x >> 4) | (__x << 4);  \
  69        __x = ((__x & (u8)0xCCU) >> 2) | ((__x & (u8)0x33U) << 2);      \
  70        __x = ((__x & (u8)0xAAU) >> 1) | ((__x & (u8)0x55U) << 1);      \
  71        __x;                            \
  72})
  73
  74#define bitrev32(x)                     \
  75({                                      \
  76        u32 __x = x;                    \
  77        __builtin_constant_p(__x) ?     \
  78        __constant_bitrev32(__x) :      \
  79        __bitrev32(__x);                \
  80})
  81
  82#define bitrev16(x)                     \
  83({                                      \
  84        u16 __x = x;                    \
  85        __builtin_constant_p(__x) ?     \
  86        __constant_bitrev16(__x) :      \
  87        __bitrev16(__x);                \
  88})
  89
  90#define bitrev8x4(x)                    \
  91({                                      \
  92        u32 __x = x;                    \
  93        __builtin_constant_p(__x) ?     \
  94        __constant_bitrev8x4(__x) :     \
  95        __bitrev8x4(__x);               \
  96})
  97
  98#define bitrev8(x)                      \
  99({                                      \
 100        u8 __x = x;                     \
 101        __builtin_constant_p(__x) ?     \
 102        __constant_bitrev8(__x) :       \
 103        __bitrev8(__x)  ;               \
 104})
 105#endif /* _LINUX_BITREV_H */
 106