cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bitrev.h (2594B)

      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 */