mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 10:56:40 +00:00
dea5c24a14
These identifiers are bogus. The interested architectures should define HAVE_EFFICIENT_UNALIGNED_ACCESS whenever relevant to do so. If this isn't true for some arch, it should be fixed in the arch definition. Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
/*
|
|
* lz4defs.h -- architecture specific defines
|
|
*
|
|
* Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
/*
|
|
* Detects 64 bits mode
|
|
*/
|
|
#if defined(CONFIG_64BIT)
|
|
#define LZ4_ARCH64 1
|
|
#else
|
|
#define LZ4_ARCH64 0
|
|
#endif
|
|
|
|
/*
|
|
* Architecture-specific macros
|
|
*/
|
|
#define BYTE u8
|
|
typedef struct _U16_S { u16 v; } U16_S;
|
|
typedef struct _U32_S { u32 v; } U32_S;
|
|
typedef struct _U64_S { u64 v; } U64_S;
|
|
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
|
|
|
|
#define A16(x) (((U16_S *)(x))->v)
|
|
#define A32(x) (((U32_S *)(x))->v)
|
|
#define A64(x) (((U64_S *)(x))->v)
|
|
|
|
#define PUT4(s, d) (A32(d) = A32(s))
|
|
#define PUT8(s, d) (A64(d) = A64(s))
|
|
|
|
#define LZ4_READ_LITTLEENDIAN_16(d, s, p) \
|
|
(d = s - A16(p))
|
|
|
|
#define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
|
|
do { \
|
|
A16(p) = v; \
|
|
p += 2; \
|
|
} while (0)
|
|
#else /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */
|
|
|
|
#define A64(x) get_unaligned((u64 *)&(((U16_S *)(x))->v))
|
|
#define A32(x) get_unaligned((u32 *)&(((U16_S *)(x))->v))
|
|
#define A16(x) get_unaligned((u16 *)&(((U16_S *)(x))->v))
|
|
|
|
#define PUT4(s, d) \
|
|
put_unaligned(get_unaligned((const u32 *) s), (u32 *) d)
|
|
#define PUT8(s, d) \
|
|
put_unaligned(get_unaligned((const u64 *) s), (u64 *) d)
|
|
|
|
#define LZ4_READ_LITTLEENDIAN_16(d, s, p) \
|
|
(d = s - get_unaligned_le16(p))
|
|
|
|
#define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
|
|
do { \
|
|
put_unaligned_le16(v, (u16 *)(p)); \
|
|
p += 2; \
|
|
} while (0)
|
|
#endif
|
|
|
|
#define COPYLENGTH 8
|
|
#define ML_BITS 4
|
|
#define ML_MASK ((1U << ML_BITS) - 1)
|
|
#define RUN_BITS (8 - ML_BITS)
|
|
#define RUN_MASK ((1U << RUN_BITS) - 1)
|
|
#define MEMORY_USAGE 14
|
|
#define MINMATCH 4
|
|
#define SKIPSTRENGTH 6
|
|
#define LASTLITERALS 5
|
|
#define MFLIMIT (COPYLENGTH + MINMATCH)
|
|
#define MINLENGTH (MFLIMIT + 1)
|
|
#define MAXD_LOG 16
|
|
#define MAXD (1 << MAXD_LOG)
|
|
#define MAXD_MASK (u32)(MAXD - 1)
|
|
#define MAX_DISTANCE (MAXD - 1)
|
|
#define HASH_LOG (MAXD_LOG - 1)
|
|
#define HASHTABLESIZE (1 << HASH_LOG)
|
|
#define MAX_NB_ATTEMPTS 256
|
|
#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
|
|
#define LZ4_64KLIMIT ((1<<16) + (MFLIMIT - 1))
|
|
#define HASHLOG64K ((MEMORY_USAGE - 2) + 1)
|
|
#define HASH64KTABLESIZE (1U << HASHLOG64K)
|
|
#define LZ4_HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
|
|
((MINMATCH * 8) - (MEMORY_USAGE-2)))
|
|
#define LZ4_HASH64K_VALUE(p) (((A32(p)) * 2654435761U) >> \
|
|
((MINMATCH * 8) - HASHLOG64K))
|
|
#define HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
|
|
((MINMATCH * 8) - HASH_LOG))
|
|
|
|
#if LZ4_ARCH64/* 64-bit */
|
|
#define STEPSIZE 8
|
|
|
|
#define LZ4_COPYSTEP(s, d) \
|
|
do { \
|
|
PUT8(s, d); \
|
|
d += 8; \
|
|
s += 8; \
|
|
} while (0)
|
|
|
|
#define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d)
|
|
|
|
#define LZ4_SECURECOPY(s, d, e) \
|
|
do { \
|
|
if (d < e) { \
|
|
LZ4_WILDCOPY(s, d, e); \
|
|
} \
|
|
} while (0)
|
|
#define HTYPE u32
|
|
|
|
#ifdef __BIG_ENDIAN
|
|
#define LZ4_NBCOMMONBYTES(val) (__builtin_clzll(val) >> 3)
|
|
#else
|
|
#define LZ4_NBCOMMONBYTES(val) (__builtin_ctzll(val) >> 3)
|
|
#endif
|
|
|
|
#else /* 32-bit */
|
|
#define STEPSIZE 4
|
|
|
|
#define LZ4_COPYSTEP(s, d) \
|
|
do { \
|
|
PUT4(s, d); \
|
|
d += 4; \
|
|
s += 4; \
|
|
} while (0)
|
|
|
|
#define LZ4_COPYPACKET(s, d) \
|
|
do { \
|
|
LZ4_COPYSTEP(s, d); \
|
|
LZ4_COPYSTEP(s, d); \
|
|
} while (0)
|
|
|
|
#define LZ4_SECURECOPY LZ4_WILDCOPY
|
|
#define HTYPE const u8*
|
|
|
|
#ifdef __BIG_ENDIAN
|
|
#define LZ4_NBCOMMONBYTES(val) (__builtin_clz(val) >> 3)
|
|
#else
|
|
#define LZ4_NBCOMMONBYTES(val) (__builtin_ctz(val) >> 3)
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#define LZ4_WILDCOPY(s, d, e) \
|
|
do { \
|
|
LZ4_COPYPACKET(s, d); \
|
|
} while (d < e)
|
|
|
|
#define LZ4_BLINDCOPY(s, d, l) \
|
|
do { \
|
|
u8 *e = (d) + l; \
|
|
LZ4_WILDCOPY(s, d, e); \
|
|
d = e; \
|
|
} while (0)
|