1/* SPDX-License-Identifier: MIT */
2/*
3 * Common definitions for libfsverity and the 'fsverity' program
4 *
5 * Copyright 2018 Google LLC
6 *
7 * Use of this source code is governed by an MIT-style
8 * license that can be found in the LICENSE file or at
9 * https://opensource.org/licenses/MIT.
10 */
11#ifndef COMMON_COMMON_DEFS_H
12#define COMMON_COMMON_DEFS_H
13
14#include <stdbool.h>
15#include <stddef.h>
16#include <stdint.h>
17
18#include "win32_defs.h"
19
20typedef uint8_t u8;
21typedef uint16_t u16;
22typedef uint32_t u32;
23typedef uint64_t u64;
24
25#ifndef __force
26#  ifdef __CHECKER__
27#    define __force	__attribute__((force))
28#  else
29#    define __force
30#  endif
31#endif
32
33#ifndef __printf
34#  define __printf(fmt_idx, vargs_idx) \
35	__attribute__((format(printf, fmt_idx, vargs_idx)))
36#endif
37
38#ifndef __noreturn
39#  define __noreturn	__attribute__((noreturn))
40#endif
41
42#ifndef __cold
43#  define __cold	__attribute__((cold))
44#endif
45
46#define min(a, b) ({			\
47	__typeof__(a) _a = (a);		\
48	__typeof__(b) _b = (b);		\
49	_a < _b ? _a : _b;		\
50})
51
52#define max(a, b) ({			\
53	__typeof__(a) _a = (a);		\
54	__typeof__(b) _b = (b);		\
55	_a > _b ? _a : _b;		\
56})
57
58#define roundup(x, y) ({		\
59	__typeof__(y) _y = (y);		\
60	(((x) + _y - 1) / _y) * _y;	\
61})
62
63#define ARRAY_SIZE(A)		(sizeof(A) / sizeof((A)[0]))
64
65#define DIV_ROUND_UP(n, d)	(((n) + (d) - 1) / (d))
66
67static inline bool is_power_of_2(unsigned long n)
68{
69	return n != 0 && ((n & (n - 1)) == 0);
70}
71
72static inline int ilog2(unsigned long n)
73{
74	return (8 * sizeof(n) - 1) - __builtin_clzl(n);
75}
76
77/* ========== Endianness conversion ========== */
78
79#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
80#  define cpu_to_le16(v)	((__force __le16)(u16)(v))
81#  define le16_to_cpu(v)	((__force u16)(__le16)(v))
82#  define cpu_to_le32(v)	((__force __le32)(u32)(v))
83#  define le32_to_cpu(v)	((__force u32)(__le32)(v))
84#  define cpu_to_le64(v)	((__force __le64)(u64)(v))
85#  define le64_to_cpu(v)	((__force u64)(__le64)(v))
86#else
87#  define cpu_to_le16(v)	((__force __le16)__builtin_bswap16(v))
88#  define le16_to_cpu(v)	(__builtin_bswap16((__force u16)(v)))
89#  define cpu_to_le32(v)	((__force __le32)__builtin_bswap32(v))
90#  define le32_to_cpu(v)	(__builtin_bswap32((__force u32)(v)))
91#  define cpu_to_le64(v)	((__force __le64)__builtin_bswap64(v))
92#  define le64_to_cpu(v)	(__builtin_bswap64((__force u64)(v)))
93#endif
94
95#endif /* COMMON_COMMON_DEFS_H */
96