1 /*
2 * lz4defs.h -- architecture specific defines
3 *
4 * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #ifndef COMMON_LZ4_DEFS_H
12 #define COMMON_LZ4_DEFS_H
13
14 #ifdef __XEN__
15 #include <asm/byteorder.h>
16 #include <xen/unaligned.h>
17 #else
18
get_unaligned_le16(const void * p)19 static inline u16 get_unaligned_le16(const void *p)
20 {
21 return le16_to_cpup(p);
22 }
23
24 #endif
25
26 /*
27 * Detects 64 bits mode
28 */
29 #if (defined(__x86_64__) || defined(__x86_64) || defined(__amd64__) \
30 || defined(__ppc64__) || defined(__LP64__))
31 #define LZ4_ARCH64 1
32 #else
33 #define LZ4_ARCH64 0
34 #endif
35
36 /*
37 * Architecture-specific macros
38 */
39 #define BYTE u8
40 typedef struct _U16_S { u16 v; } U16_S;
41 typedef struct _U32_S { u32 v; } U32_S;
42 typedef struct _U64_S { u64 v; } U64_S;
43 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) \
44 || defined(CONFIG_ARM) && __LINUX_ARM_ARCH__ >= 6 \
45 && defined(ARM_EFFICIENT_UNALIGNED_ACCESS)
46
47 #define A16(x) (((U16_S *)(x))->v)
48 #define A32(x) (((U32_S *)(x))->v)
49 #define A64(x) (((U64_S *)(x))->v)
50
51 #define PUT4(s, d) (A32(d) = A32(s))
52 #define PUT8(s, d) (A64(d) = A64(s))
53 #define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
54 do { \
55 A16(p) = v; \
56 p += 2; \
57 } while (0)
58 #else /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */
59
60 #define A64(x) get_unaligned((u64 *)&(((U16_S *)(x))->v))
61 #define A32(x) get_unaligned((u32 *)&(((U16_S *)(x))->v))
62 #define A16(x) get_unaligned((u16 *)&(((U16_S *)(x))->v))
63
64 #define PUT4(s, d) \
65 put_unaligned(get_unaligned((const u32 *) s), (u32 *) d)
66 #define PUT8(s, d) \
67 put_unaligned(get_unaligned((const u64 *) s), (u64 *) d)
68
69 #define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
70 do { \
71 put_unaligned(v, (u16 *)(p)); \
72 p += 2; \
73 } while (0)
74 #endif
75
76 #define COPYLENGTH 8
77 #define ML_BITS 4
78 #define ML_MASK ((1U << ML_BITS) - 1)
79 #define RUN_BITS (8 - ML_BITS)
80 #define RUN_MASK ((1U << RUN_BITS) - 1)
81 #define MEMORY_USAGE 14
82 #define MINMATCH 4
83 #define SKIPSTRENGTH 6
84 #define LASTLITERALS 5
85 #define MFLIMIT (COPYLENGTH + MINMATCH)
86 #define MINLENGTH (MFLIMIT + 1)
87 #define MAXD_LOG 16
88 #define MAXD (1 << MAXD_LOG)
89 #define MAXD_MASK (u32)(MAXD - 1)
90 #define MAX_DISTANCE (MAXD - 1)
91 #define HASH_LOG (MAXD_LOG - 1)
92 #define HASHTABLESIZE (1 << HASH_LOG)
93 #define MAX_NB_ATTEMPTS 256
94 #define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
95 #define LZ4_64KLIMIT ((1<<16) + (MFLIMIT - 1))
96 #define HASHLOG64K ((MEMORY_USAGE - 2) + 1)
97 #define HASH64KTABLESIZE (1U << HASHLOG64K)
98 #define LZ4_HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
99 ((MINMATCH * 8) - (MEMORY_USAGE-2)))
100 #define LZ4_HASH64K_VALUE(p) (((A32(p)) * 2654435761U) >> \
101 ((MINMATCH * 8) - HASHLOG64K))
102 #define HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
103 ((MINMATCH * 8) - HASH_LOG))
104
105 #if LZ4_ARCH64/* 64-bit */
106 #define STEPSIZE 8
107
108 #define LZ4_COPYSTEP(s, d) \
109 do { \
110 PUT8(s, d); \
111 d += 8; \
112 s += 8; \
113 } while (0)
114
115 #define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d)
116
117 #define LZ4_SECURECOPY(s, d, e) \
118 do { \
119 if (d < e) { \
120 LZ4_WILDCOPY(s, d, e); \
121 } \
122 } while (0)
123 #define HTYPE u32
124
125 #ifdef __BIG_ENDIAN
126 #define LZ4_NBCOMMONBYTES(val) (__builtin_clzll(val) >> 3)
127 #else
128 #define LZ4_NBCOMMONBYTES(val) (__builtin_ctzll(val) >> 3)
129 #endif
130
131 #else /* 32-bit */
132 #define STEPSIZE 4
133
134 #define LZ4_COPYSTEP(s, d) \
135 do { \
136 PUT4(s, d); \
137 d += 4; \
138 s += 4; \
139 } while (0)
140
141 #define LZ4_COPYPACKET(s, d) \
142 do { \
143 LZ4_COPYSTEP(s, d); \
144 LZ4_COPYSTEP(s, d); \
145 } while (0)
146
147 #define LZ4_SECURECOPY LZ4_WILDCOPY
148 #define HTYPE const u8*
149
150 #ifdef __BIG_ENDIAN
151 #define LZ4_NBCOMMONBYTES(val) (__builtin_clz(val) >> 3)
152 #else
153 #define LZ4_NBCOMMONBYTES(val) (__builtin_ctz(val) >> 3)
154 #endif
155
156 #endif
157
158 #define LZ4_READ_LITTLEENDIAN_16(d, s, p) \
159 (d = s - get_unaligned_le16(p))
160
161 #define LZ4_WILDCOPY(s, d, e) \
162 do { \
163 LZ4_COPYPACKET(s, d); \
164 } while (d < e)
165
166 #define LZ4_BLINDCOPY(s, d, l) \
167 do { \
168 u8 *e = (d) + l; \
169 LZ4_WILDCOPY(s, d, e); \
170 d = e; \
171 } while (0)
172
173 #endif /* COMMON_LZ4_DEFS_H */
174