| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * erofs-utils/include/erofs/defs.h |
| * |
| * Copyright (C) 2018 HUAWEI, Inc. |
| * http://www.huawei.com/ |
| * Created by Li Guifu <bluce.liguifu@huawei.com> |
| * Modified by Gao Xiang <gaoxiang25@huawei.com> |
| */ |
| #ifndef __EROFS_DEFS_H |
| #define __EROFS_DEFS_H |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <assert.h> |
| #include <inttypes.h> |
| #include <limits.h> |
| #include <stdbool.h> |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #ifdef HAVE_LINUX_TYPES_H |
| #include <linux/types.h> |
| #endif |
| |
| /* |
| * container_of - cast a member of a structure out to the containing structure |
| * @ptr: the pointer to the member. |
| * @type: the type of the container struct this is embedded in. |
| * @member: the name of the member within the struct. |
| */ |
| #define container_of(ptr, type, member) ({ \ |
| const typeof(((type *)0)->member) *__mptr = (ptr); \ |
| (type *)((char *)__mptr - offsetof(type, member)); }) |
| |
| typedef uint8_t u8; |
| typedef uint16_t u16; |
| typedef uint32_t u32; |
| typedef uint64_t u64; |
| |
| #ifndef HAVE_LINUX_TYPES_H |
| typedef u8 __u8; |
| typedef u16 __u16; |
| typedef u32 __u32; |
| typedef u64 __u64; |
| typedef u16 __le16; |
| typedef u32 __le32; |
| typedef u64 __le64; |
| typedef u16 __be16; |
| typedef u32 __be32; |
| typedef u64 __be64; |
| #endif |
| |
| typedef int8_t s8; |
| typedef int16_t s16; |
| typedef int32_t s32; |
| typedef int64_t s64; |
| |
| |
| #if __BYTE_ORDER == __LITTLE_ENDIAN |
| /* |
| * The host byte order is the same as network byte order, |
| * so these functions are all just identity. |
| */ |
| #define cpu_to_le16(x) ((__u16)(x)) |
| #define cpu_to_le32(x) ((__u32)(x)) |
| #define cpu_to_le64(x) ((__u64)(x)) |
| #define le16_to_cpu(x) ((__u16)(x)) |
| #define le32_to_cpu(x) ((__u32)(x)) |
| #define le64_to_cpu(x) ((__u64)(x)) |
| |
| #else |
| #if __BYTE_ORDER == __BIG_ENDIAN |
| #define cpu_to_le16(x) (__builtin_bswap16(x)) |
| #define cpu_to_le32(x) (__builtin_bswap32(x)) |
| #define cpu_to_le64(x) (__builtin_bswap64(x)) |
| #define le16_to_cpu(x) (__builtin_bswap16(x)) |
| #define le32_to_cpu(x) (__builtin_bswap32(x)) |
| #define le64_to_cpu(x) (__builtin_bswap64(x)) |
| #else |
| #pragma error |
| #endif |
| #endif |
| |
| #ifndef __OPTIMIZE__ |
| #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2 * !!(condition)])) |
| #else |
| #define BUILD_BUG_ON(condition) assert(condition) |
| #endif |
| |
| #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) |
| |
| #define __round_mask(x, y) ((__typeof__(x))((y)-1)) |
| #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) |
| #define round_down(x, y) ((x) & ~__round_mask(x, y)) |
| |
| /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ |
| #define roundup(x, y) ( \ |
| { \ |
| const typeof(y) __y = y; \ |
| (((x) + (__y - 1)) / __y) * __y; \ |
| } \ |
| ) |
| #define rounddown(x, y) ( \ |
| { \ |
| typeof(x) __x = (x); \ |
| __x - (__x % (y)); \ |
| } \ |
| ) |
| |
| #define min(x, y) ({ \ |
| typeof(x) _min1 = (x); \ |
| typeof(y) _min2 = (y); \ |
| (void) (&_min1 == &_min2); \ |
| _min1 < _min2 ? _min1 : _min2; }) |
| |
| #define max(x, y) ({ \ |
| typeof(x) _max1 = (x); \ |
| typeof(y) _max2 = (y); \ |
| (void) (&_max1 == &_max2); \ |
| _max1 > _max2 ? _max1 : _max2; }) |
| |
| /* |
| * ..and if you can't take the strict types, you can specify one yourself. |
| * Or don't use min/max at all, of course. |
| */ |
| #define min_t(type, x, y) ({ \ |
| type __min1 = (x); \ |
| type __min2 = (y); \ |
| __min1 < __min2 ? __min1: __min2; }) |
| |
| #define max_t(type, x, y) ({ \ |
| type __max1 = (x); \ |
| type __max2 = (y); \ |
| __max1 > __max2 ? __max1: __max2; }) |
| |
| #define cmpsgn(x, y) ({ \ |
| typeof(x) _x = (x); \ |
| typeof(y) _y = (y); \ |
| (_x > _y) - (_x < _y); }) |
| |
| #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) |
| |
| #define BIT(nr) (1UL << (nr)) |
| #define BIT_ULL(nr) (1ULL << (nr)) |
| #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
| #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
| #define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG)) |
| #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) |
| #define BITS_PER_BYTE 8 |
| #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) |
| |
| #ifdef __SIZEOF_LONG__ |
| #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__) |
| #else |
| #define BITS_PER_LONG __WORDSIZE |
| #endif |
| |
| #define BUG_ON(cond) assert(!(cond)) |
| |
| #ifdef NDEBUG |
| #define DBG_BUGON(condition) ((void)(condition)) |
| #else |
| #define DBG_BUGON(condition) BUG_ON(condition) |
| #endif |
| |
| #ifndef __maybe_unused |
| #define __maybe_unused __attribute__((__unused__)) |
| #endif |
| |
| #endif |
| |