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 /* 12 * Detects 64 bits mode 13 */ 14 #if (defined(__x86_64__) || defined(__x86_64) || defined(__amd64__) \ 15 || defined(__ppc64__) || defined(__LP64__)) 16 #define LZ4_ARCH64 1 17 #else 18 #define LZ4_ARCH64 0 19 #endif 20 21 /* 22 * Architecture-specific macros 23 */ 24 #define BYTE u8 25 typedef struct _U16_S { u16 v; } U16_S; 26 typedef struct _U32_S { u32 v; } U32_S; 27 typedef struct _U64_S { u64 v; } U64_S; 28 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) \ 29 || defined(CONFIG_ARM) && __LINUX_ARM_ARCH__ >= 6 \ 30 && defined(ARM_EFFICIENT_UNALIGNED_ACCESS) 31 32 #define A16(x) (((U16_S *)(x))->v) 33 #define A32(x) (((U32_S *)(x))->v) 34 #define A64(x) (((U64_S *)(x))->v) 35 36 #define PUT4(s, d) (A32(d) = A32(s)) 37 #define PUT8(s, d) (A64(d) = A64(s)) 38 #define LZ4_WRITE_LITTLEENDIAN_16(p, v) \ 39 do { \ 40 A16(p) = v; \ 41 p += 2; \ 42 } while (0) 43 #else /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */ 44 45 #define A64(x) get_unaligned((u64 *)&(((U16_S *)(x))->v)) 46 #define A32(x) get_unaligned((u32 *)&(((U16_S *)(x))->v)) 47 #define A16(x) get_unaligned((u16 *)&(((U16_S *)(x))->v)) 48 49 #define PUT4(s, d) \ 50 put_unaligned(get_unaligned((const u32 *) s), (u32 *) d) 51 #define PUT8(s, d) \ 52 put_unaligned(get_unaligned((const u64 *) s), (u64 *) d) 53 54 #define LZ4_WRITE_LITTLEENDIAN_16(p, v) \ 55 do { \ 56 put_unaligned(v, (u16 *)(p)); \ 57 p += 2; \ 58 } while (0) 59 #endif 60 61 #define COPYLENGTH 8 62 #define ML_BITS 4 63 #define ML_MASK ((1U << ML_BITS) - 1) 64 #define RUN_BITS (8 - ML_BITS) 65 #define RUN_MASK ((1U << RUN_BITS) - 1) 66 #define MEMORY_USAGE 14 67 #define MINMATCH 4 68 #define SKIPSTRENGTH 6 69 #define LASTLITERALS 5 70 #define MFLIMIT (COPYLENGTH + MINMATCH) 71 #define MINLENGTH (MFLIMIT + 1) 72 #define MAXD_LOG 16 73 #define MAXD (1 << MAXD_LOG) 74 #define MAXD_MASK (u32)(MAXD - 1) 75 #define MAX_DISTANCE (MAXD - 1) 76 #define HASH_LOG (MAXD_LOG - 1) 77 #define HASHTABLESIZE (1 << HASH_LOG) 78 #define MAX_NB_ATTEMPTS 256 79 #define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH) 80 #define LZ4_64KLIMIT ((1<<16) + (MFLIMIT - 1)) 81 #define HASHLOG64K ((MEMORY_USAGE - 2) + 1) 82 #define HASH64KTABLESIZE (1U << HASHLOG64K) 83 #define LZ4_HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \ 84 ((MINMATCH * 8) - (MEMORY_USAGE-2))) 85 #define LZ4_HASH64K_VALUE(p) (((A32(p)) * 2654435761U) >> \ 86 ((MINMATCH * 8) - HASHLOG64K)) 87 #define HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \ 88 ((MINMATCH * 8) - HASH_LOG)) 89 90 #if LZ4_ARCH64/* 64-bit */ 91 #define STEPSIZE 8 92 93 #define LZ4_COPYSTEP(s, d) \ 94 do { \ 95 PUT8(s, d); \ 96 d += 8; \ 97 s += 8; \ 98 } while (0) 99 100 #define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d) 101 102 #define LZ4_SECURECOPY(s, d, e) \ 103 do { \ 104 if (d < e) { \ 105 LZ4_WILDCOPY(s, d, e); \ 106 } \ 107 } while (0) 108 #define HTYPE u32 109 110 #ifdef __BIG_ENDIAN 111 #define LZ4_NBCOMMONBYTES(val) (__builtin_clzll(val) >> 3) 112 #else 113 #define LZ4_NBCOMMONBYTES(val) (__builtin_ctzll(val) >> 3) 114 #endif 115 116 #else /* 32-bit */ 117 #define STEPSIZE 4 118 119 #define LZ4_COPYSTEP(s, d) \ 120 do { \ 121 PUT4(s, d); \ 122 d += 4; \ 123 s += 4; \ 124 } while (0) 125 126 #define LZ4_COPYPACKET(s, d) \ 127 do { \ 128 LZ4_COPYSTEP(s, d); \ 129 LZ4_COPYSTEP(s, d); \ 130 } while (0) 131 132 #define LZ4_SECURECOPY LZ4_WILDCOPY 133 #define HTYPE const u8* 134 135 #ifdef __BIG_ENDIAN 136 #define LZ4_NBCOMMONBYTES(val) (__builtin_clz(val) >> 3) 137 #else 138 #define LZ4_NBCOMMONBYTES(val) (__builtin_ctz(val) >> 3) 139 #endif 140 141 #endif 142 143 #define LZ4_READ_LITTLEENDIAN_16(d, s, p) \ 144 (d = s - get_unaligned_le16(p)) 145 146 #define LZ4_WILDCOPY(s, d, e) \ 147 do { \ 148 LZ4_COPYPACKET(s, d); \ 149 } while (d < e) 150 151 #define LZ4_BLINDCOPY(s, d, l) \ 152 do { \ 153 u8 *e = (d) + l; \ 154 LZ4_WILDCOPY(s, d, e); \ 155 d = e; \ 156 } while (0) 157