1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * erofs-utils/include/erofs/defs.h
4 *
5 * Copyright (C) 2018 HUAWEI, Inc.
6 * http://www.huawei.com/
7 * Created by Li Guifu <bluce.liguifu@huawei.com>
8 * Modified by Gao Xiang <gaoxiang25@huawei.com>
9 */
10 #ifndef __EROFS_DEFS_H
11 #define __EROFS_DEFS_H
12
13 #include <stddef.h>
14 #include <stdint.h>
15 #include <assert.h>
16 #include <inttypes.h>
17 #include <limits.h>
18 #include <stdbool.h>
19
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23
24 #ifdef HAVE_LINUX_TYPES_H
25 #include <linux/types.h>
26 #endif
27
28 /*
29 * container_of - cast a member of a structure out to the containing structure
30 * @ptr: the pointer to the member.
31 * @type: the type of the container struct this is embedded in.
32 * @member: the name of the member within the struct.
33 */
34 #define container_of(ptr, type, member) ({ \
35 const typeof(((type *)0)->member) *__mptr = (ptr); \
36 (type *)((char *)__mptr - offsetof(type, member)); })
37
38 typedef uint8_t u8;
39 typedef uint16_t u16;
40 typedef uint32_t u32;
41 typedef uint64_t u64;
42
43 #ifndef HAVE_LINUX_TYPES_H
44 typedef u8 __u8;
45 typedef u16 __u16;
46 typedef u32 __u32;
47 typedef u64 __u64;
48 typedef u16 __le16;
49 typedef u32 __le32;
50 typedef u64 __le64;
51 typedef u16 __be16;
52 typedef u32 __be32;
53 typedef u64 __be64;
54 #endif
55
56 typedef int8_t s8;
57 typedef int16_t s16;
58 typedef int32_t s32;
59 typedef int64_t s64;
60
61
62 #if __BYTE_ORDER == __LITTLE_ENDIAN
63 /*
64 * The host byte order is the same as network byte order,
65 * so these functions are all just identity.
66 */
67 #define cpu_to_le16(x) ((__u16)(x))
68 #define cpu_to_le32(x) ((__u32)(x))
69 #define cpu_to_le64(x) ((__u64)(x))
70 #define le16_to_cpu(x) ((__u16)(x))
71 #define le32_to_cpu(x) ((__u32)(x))
72 #define le64_to_cpu(x) ((__u64)(x))
73
74 #else
75 #if __BYTE_ORDER == __BIG_ENDIAN
76 #define cpu_to_le16(x) (__builtin_bswap16(x))
77 #define cpu_to_le32(x) (__builtin_bswap32(x))
78 #define cpu_to_le64(x) (__builtin_bswap64(x))
79 #define le16_to_cpu(x) (__builtin_bswap16(x))
80 #define le32_to_cpu(x) (__builtin_bswap32(x))
81 #define le64_to_cpu(x) (__builtin_bswap64(x))
82 #else
83 #pragma error
84 #endif
85 #endif
86
87 #ifndef __OPTIMIZE__
88 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2 * !!(condition)]))
89 #else
90 #define BUILD_BUG_ON(condition) assert(condition)
91 #endif
92
93 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
94
95 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
96 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
97 #define round_down(x, y) ((x) & ~__round_mask(x, y))
98
99 /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
100 #define roundup(x, y) ( \
101 { \
102 const typeof(y) __y = y; \
103 (((x) + (__y - 1)) / __y) * __y; \
104 } \
105 )
106 #define rounddown(x, y) ( \
107 { \
108 typeof(x) __x = (x); \
109 __x - (__x % (y)); \
110 } \
111 )
112
113 #define min(x, y) ({ \
114 typeof(x) _min1 = (x); \
115 typeof(y) _min2 = (y); \
116 (void) (&_min1 == &_min2); \
117 _min1 < _min2 ? _min1 : _min2; })
118
119 #define max(x, y) ({ \
120 typeof(x) _max1 = (x); \
121 typeof(y) _max2 = (y); \
122 (void) (&_max1 == &_max2); \
123 _max1 > _max2 ? _max1 : _max2; })
124
125 /*
126 * ..and if you can't take the strict types, you can specify one yourself.
127 * Or don't use min/max at all, of course.
128 */
129 #define min_t(type, x, y) ({ \
130 type __min1 = (x); \
131 type __min2 = (y); \
132 __min1 < __min2 ? __min1: __min2; })
133
134 #define max_t(type, x, y) ({ \
135 type __max1 = (x); \
136 type __max2 = (y); \
137 __max1 > __max2 ? __max1: __max2; })
138
139 #define cmpsgn(x, y) ({ \
140 typeof(x) _x = (x); \
141 typeof(y) _y = (y); \
142 (_x > _y) - (_x < _y); })
143
144 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
145
146 #define BIT(nr) (1UL << (nr))
147 #define BIT_ULL(nr) (1ULL << (nr))
148 #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
149 #define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
150 #define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG))
151 #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
152 #define BITS_PER_BYTE 8
153 #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
154
155 #ifdef __SIZEOF_LONG__
156 #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
157 #else
158 #define BITS_PER_LONG __WORDSIZE
159 #endif
160
161 #define BUG_ON(cond) assert(!(cond))
162
163 #ifdef NDEBUG
164 #define DBG_BUGON(condition) ((void)(condition))
165 #else
166 #define DBG_BUGON(condition) BUG_ON(condition)
167 #endif
168
169 #ifndef __maybe_unused
170 #define __maybe_unused __attribute__((__unused__))
171 #endif
172
get_unaligned_le32(const u8 * p)173 static inline u32 get_unaligned_le32(const u8 *p)
174 {
175 return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
176 }
177
178 #endif
179
180