lib/lzo/lzodefs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  lzodefs.h -- architecture, OS and compiler specific defines
   4  *
   5  *  Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
   6  *
   7  *  The full LZO package can be found at:
   8  *  http://www.oberhumer.com/opensource/lzo/
   9  *
  10  *  Changed for Linux kernel use by:
  11  *  Nitin Gupta <nitingupta910@gmail.com>
  12  *  Richard Purdie <rpurdie@openedhand.com>
  13  */
  14
  15
  16 #define COPY4(dst, src) \
  17                 put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
  18 #if defined(__x86_64__)
  19 #define COPY8(dst, src) \
  20                 put_unaligned(get_unaligned((const u64 *)(src)), (u64 *)(dst))
  21 #else
  22 #define COPY8(dst, src) \
  23                 COPY4(dst, src); COPY4((dst) + 4, (src) + 4)
  24 #endif
  25
  26 #if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN)
  27 #error "conflicting endian definitions"
  28 #elif defined(__x86_64__)
  29 #define LZO_USE_CTZ64   1
  30 #define LZO_USE_CTZ32   1
  31 #elif defined(__i386__) || defined(__powerpc__)
  32 #define LZO_USE_CTZ32   1
  33 #elif defined(__arm__) && (__LINUX_ARM_ARCH__ >= 5)
  34 #define LZO_USE_CTZ32   1
  35 #endif
  36
  37 #define M1_MAX_OFFSET   0x0400
  38 #define M2_MAX_OFFSET   0x0800
  39 #define M3_MAX_OFFSET   0x4000
  40 #define M4_MAX_OFFSET   0xbfff
  41
  42 #define M1_MIN_LEN      2
  43 #define M1_MAX_LEN      2
  44 #define M2_MIN_LEN      3
  45 #define M2_MAX_LEN      8
  46 #define M3_MIN_LEN      3
  47 #define M3_MAX_LEN      33
  48 #define M4_MIN_LEN      3
  49 #define M4_MAX_LEN      9
  50
  51 #define M1_MARKER       0
  52 #define M2_MARKER       64
  53 #define M3_MARKER       32
  54 #define M4_MARKER       16
  55
  56 #define lzo_dict_t      unsigned short
  57 #define D_BITS          13
  58 #define D_SIZE          (1u << D_BITS)
  59 #define D_MASK          (D_SIZE - 1)
  60 #define D_HIGH          ((D_MASK >> 1) + 1)