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lib: bitrev: Sync with Linux kernel v4.17

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Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2018-08-02 23:58:02 -07:00 committed by Simon Glass
parent e599c4e7d8
commit 9c2cb97e22
2 changed files with 102 additions and 28 deletions
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102
include/linux/bitrev.h
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@ -1,21 +1,105 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Based on bitrev from the Linux kernel, by Akinobu Mita
*/
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_BITREV_H
#define _LINUX_BITREV_H
#include <linux/types.h>
extern u8 const byte_rev_table[256];
#ifdef CONFIG_HAVE_ARCH_BITREVERSE
#include <asm/bitrev.h>
static inline u8 bitrev8(u8 byte)
#define __bitrev32 __arch_bitrev32
#define __bitrev16 __arch_bitrev16
#define __bitrev8 __arch_bitrev8
#else
extern u8 const byte_rev_table[256];
static inline u8 __bitrev8(u8 byte)
{
return byte_rev_table[byte];
}
u16 bitrev16(u16 in);
u32 bitrev32(u32 in);
static inline u16 __bitrev16(u16 x)
{
return (__bitrev8(x & 0xff) << 8) | __bitrev8(x >> 8);
}
static inline u32 __bitrev32(u32 x)
{
return (__bitrev16(x & 0xffff) << 16) | __bitrev16(x >> 16);
}
#endif /* CONFIG_HAVE_ARCH_BITREVERSE */
#define __bitrev8x4(x) (__bitrev32(swab32(x)))
#define __constant_bitrev32(x) \
({ \
u32 __x = x; \
__x = (__x >> 16) | (__x << 16);\
__x = ((__x & (u32)0xFF00FF00UL) >> 8) | ((__x & (u32)0x00FF00FFUL) << 8); \
__x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4); \
__x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2); \
__x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1); \
__x; \
})
#define __constant_bitrev16(x) \
({ \
u16 __x = x; \
__x = (__x >> 8) | (__x << 8); \
__x = ((__x & (u16)0xF0F0U) >> 4) | ((__x & (u16)0x0F0FU) << 4); \
__x = ((__x & (u16)0xCCCCU) >> 2) | ((__x & (u16)0x3333U) << 2); \
__x = ((__x & (u16)0xAAAAU) >> 1) | ((__x & (u16)0x5555U) << 1); \
__x; \
})
#define __constant_bitrev8x4(x) \
({ \
u32 __x = x; \
__x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4); \
__x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2); \
__x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1); \
__x; \
})
#define __constant_bitrev8(x) \
({ \
u8 __x = x; \
__x = (__x >> 4) | (__x << 4); \
__x = ((__x & (u8)0xCCU) >> 2) | ((__x & (u8)0x33U) << 2); \
__x = ((__x & (u8)0xAAU) >> 1) | ((__x & (u8)0x55U) << 1); \
__x; \
})
#define bitrev32(x) \
({ \
u32 __x = x; \
__builtin_constant_p(__x) ? \
__constant_bitrev32(__x) : \
__bitrev32(__x); \
})
#define bitrev16(x) \
({ \
u16 __x = x; \
__builtin_constant_p(__x) ? \
__constant_bitrev16(__x) : \
__bitrev16(__x); \
})
#define bitrev8x4(x) \
({ \
u32 __x = x; \
__builtin_constant_p(__x) ? \
__constant_bitrev8x4(__x) : \
__bitrev8x4(__x); \
})
#define bitrev8(x) \
({ \
u8 __x = x; \
__builtin_constant_p(__x) ? \
__constant_bitrev8(__x) : \
__bitrev8(__x) ; \
})
#endif /* _LINUX_BITREV_H */

28
lib/bitrev.c
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@ -1,13 +1,14 @@
// SPDX-License-Identifier: GPL-2.0+
/*
*
* Based on bitrev from the Linux kernel, by Akinobu Mita
*/
// SPDX-License-Identifier: GPL-2.0
#ifndef CONFIG_HAVE_ARCH_BITREVERSE
#include <linux/types.h>
#include <linux/compat.h>
#include <linux/bitrev.h>
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
MODULE_DESCRIPTION("Bit ordering reversal functions");
MODULE_LICENSE("GPL");
const u8 byte_rev_table[256] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
@ -42,17 +43,6 @@ const u8 byte_rev_table[256] = {
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
};
EXPORT_SYMBOL_GPL(byte_rev_table);
u16 bitrev16(u16 x)
{
return (bitrev8(x & 0xff) << 8) | bitrev8(x >> 8);
}
/**
* bitrev32 - reverse the order of bits in a u32 value
* @x: value to be bit-reversed
*/
u32 bitrev32(u32 x)
{
return (bitrev16(x & 0xffff) << 16) | bitrev16(x >> 16);
}
#endif /* CONFIG_HAVE_ARCH_BITREVERSE */