Signed-off-by: Bin Meng <bmeng...@gmail.com>
---
include/linux/bitrev.h | 102 ++++++++++++++++++++++++++++++++++++++++++++-----
lib/bitrev.c | 28 ++++----------
2 files changed, 101 insertions(+), 29 deletions(-)
diff --git a/include/linux/bitrev.h b/include/linux/bitrev.h
index cc5abd7..50fb0de 100644
--- a/include/linux/bitrev.h
+++ b/include/linux/bitrev.h
@@ -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>
+
+#define __bitrev32 __arch_bitrev32
+#define __bitrev16 __arch_bitrev16
+#define __bitrev8 __arch_bitrev8
-static inline u8 bitrev8(u8 byte)
+#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 */
diff --git a/lib/bitrev.c b/lib/bitrev.c
index 4d494e1..beef6c8 100644
--- a/lib/bitrev.c
+++ b/lib/bitrev.c
@@ -1,13 +1,12 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- *
- * Based on bitrev from the Linux kernel, by Akinobu Mita
- */
-
-
+#ifndef CONFIG_HAVE_ARCH_BITREVERSE
#include <linux/types.h>
+#include <linux/compat.h>
#include <linux/bitrev.h>
+MODULE_AUTHOR("Akinobu Mita <akinobu.m...@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 +41,6 @@ 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 */
--
2.7.4
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