lib/lzo/lzodefs.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  *  lzodefs.h -- architecture, OS and compiler specific defines
0004  *
0005  *  Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
0006  *
0007  *  The full LZO package can be found at:
0008  *  http://www.oberhumer.com/opensource/lzo/
0009  *
0010  *  Changed for Linux kernel use by:
0011  *  Nitin Gupta <nitingupta910@gmail.com>
0012  *  Richard Purdie <rpurdie@openedhand.com>
0013  */
0014
0015
0016 /* Version
0017  * 0: original lzo version
0018  * 1: lzo with support for RLE
0019  */
0020 #define LZO_VERSION 1
0021
0022 #define COPY4(dst, src) \
0023         put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
0024 #if defined(CONFIG_X86_64) || defined(CONFIG_ARM64)
0025 #define COPY8(dst, src) \
0026         put_unaligned(get_unaligned((const u64 *)(src)), (u64 *)(dst))
0027 #else
0028 #define COPY8(dst, src) \
0029         COPY4(dst, src); COPY4((dst) + 4, (src) + 4)
0030 #endif
0031
0032 #if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN)
0033 #error "conflicting endian definitions"
0034 #elif defined(CONFIG_X86_64) || defined(CONFIG_ARM64)
0035 #define LZO_USE_CTZ64   1
0036 #define LZO_USE_CTZ32   1
0037 #define LZO_FAST_64BIT_MEMORY_ACCESS
0038 #elif defined(CONFIG_X86) || defined(CONFIG_PPC)
0039 #define LZO_USE_CTZ32   1
0040 #elif defined(CONFIG_ARM) && (__LINUX_ARM_ARCH__ >= 5)
0041 #define LZO_USE_CTZ32   1
0042 #endif
0043
0044 #define M1_MAX_OFFSET   0x0400
0045 #define M2_MAX_OFFSET   0x0800
0046 #define M3_MAX_OFFSET   0x4000
0047 #define M4_MAX_OFFSET_V0    0xbfff
0048 #define M4_MAX_OFFSET_V1    0xbffe
0049
0050 #define M1_MIN_LEN  2
0051 #define M1_MAX_LEN  2
0052 #define M2_MIN_LEN  3
0053 #define M2_MAX_LEN  8
0054 #define M3_MIN_LEN  3
0055 #define M3_MAX_LEN  33
0056 #define M4_MIN_LEN  3
0057 #define M4_MAX_LEN  9
0058
0059 #define M1_MARKER   0
0060 #define M2_MARKER   64
0061 #define M3_MARKER   32
0062 #define M4_MARKER   16
0063
0064 #define MIN_ZERO_RUN_LENGTH 4
0065 #define MAX_ZERO_RUN_LENGTH (2047 + MIN_ZERO_RUN_LENGTH)
0066
0067 #define lzo_dict_t      unsigned short
0068 #define D_BITS      13
0069 #define D_SIZE      (1u << D_BITS)
0070 #define D_MASK      (D_SIZE - 1)
0071 #define D_HIGH      ((D_MASK >> 1) + 1)