1 /*
2 * Copyright (c) 2008-2014 Travis Geiselbrecht
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files
6 * (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23 #ifndef __LK_MACROS_H
24 #define __LK_MACROS_H
25
26 #include <stddef.h>
27 #include <stdint.h>
28
29 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
30 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
31
32 __attribute__((no_sanitize("unsigned-integer-overflow")))
round_up(uintptr_t val,size_t alignment)33 static inline uintptr_t round_up(uintptr_t val, size_t alignment) {
34 return (val + (alignment - 1)) & ~(alignment - 1);
35 }
36
round_down(uintptr_t val,size_t alignment)37 static inline uintptr_t round_down(uintptr_t val, size_t alignment) {
38 return val & ~(alignment - 1);
39 }
40
41 #define ROUND_UP(n, d) (((n) + (size_t)(d) - 1) & ~((size_t)(d) - 1))
42 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
43
align(uintptr_t ptr,size_t alignment)44 static inline uintptr_t align(uintptr_t ptr, size_t alignment) {
45 return round_up(ptr, alignment);
46 }
47
48 #define IS_ALIGNED(a, b) (!(((uintptr_t)(a)) & (((uintptr_t)(b))-1)))
49
50 #define containerof(ptr, type, member) \
51 ((type *)((uintptr_t)(ptr) - offsetof(type, member)))
52
53 #define containerof_null_safe(ptr, type, member) ({ \
54 __typeof__(ptr) __ptr = ptr;\
55 type *__t;\
56 if(__ptr)\
57 __t = containerof(__ptr, type, member);\
58 else\
59 __t = (type *)0;\
60 __t;\
61 })
62
63 #endif
64
65