xref: /linux/lib/lzo/lzodefs.h (revision 597473720f4dc69749542bfcfed4a927a43d935e)
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 /* Version
17  * 0: original lzo version
18  * 1: lzo with support for RLE
19  */
20 #define LZO_VERSION 1
21 
22 #define COPY4(dst, src)	\
23 		put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
24 #if defined(CONFIG_X86_64) || defined(CONFIG_ARM64)
25 #define COPY8(dst, src)	\
26 		put_unaligned(get_unaligned((const u64 *)(src)), (u64 *)(dst))
27 #else
28 #define COPY8(dst, src)	\
29 		COPY4(dst, src); COPY4((dst) + 4, (src) + 4)
30 #endif
31 
32 #if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN)
33 #error "conflicting endian definitions"
34 #elif defined(CONFIG_X86_64) || defined(CONFIG_ARM64)
35 #define LZO_USE_CTZ64	1
36 #define LZO_USE_CTZ32	1
37 #define LZO_FAST_64BIT_MEMORY_ACCESS
38 #elif defined(CONFIG_X86) || defined(CONFIG_PPC)
39 #define LZO_USE_CTZ32	1
40 #elif defined(CONFIG_ARM) && (__LINUX_ARM_ARCH__ >= 5)
41 #define LZO_USE_CTZ32	1
42 #endif
43 
44 #define M1_MAX_OFFSET	0x0400
45 #define M2_MAX_OFFSET	0x0800
46 #define M3_MAX_OFFSET	0x4000
47 #define M4_MAX_OFFSET_V0	0xbfff
48 #define M4_MAX_OFFSET_V1	0xbffe
49 
50 #define M1_MIN_LEN	2
51 #define M1_MAX_LEN	2
52 #define M2_MIN_LEN	3
53 #define M2_MAX_LEN	8
54 #define M3_MIN_LEN	3
55 #define M3_MAX_LEN	33
56 #define M4_MIN_LEN	3
57 #define M4_MAX_LEN	9
58 
59 #define M1_MARKER	0
60 #define M2_MARKER	64
61 #define M3_MARKER	32
62 #define M4_MARKER	16
63 
64 #define MIN_ZERO_RUN_LENGTH	4
65 #define MAX_ZERO_RUN_LENGTH	(2047 + MIN_ZERO_RUN_LENGTH)
66 
67 #define lzo_dict_t      unsigned short
68 #define D_BITS		13
69 #define D_SIZE		(1u << D_BITS)
70 #define D_MASK		(D_SIZE - 1)
71 #define D_HIGH		((D_MASK >> 1) + 1)
72