1 /* 2 * Copyright (c) 2014, STMicroelectronics International N.V. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 #ifndef UTIL_H 28 #define UTIL_H 29 30 #include <stdint.h> 31 32 #ifndef MAX 33 #define MAX(a, b) \ 34 (__extension__({ __typeof__(a) _a = (a); \ 35 __typeof__(b) _b = (b); \ 36 _a > _b ? _a : _b; })) 37 38 #define MIN(a, b) \ 39 (__extension__({ __typeof__(a) _a = (a); \ 40 __typeof__(b) _b = (b); \ 41 _a < _b ? _a : _b; })) 42 #endif 43 44 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 45 46 /* Round up the even multiple of size, size has to be a multiple of 2 */ 47 #define ROUNDUP(v, size) (((v) + ((__typeof__(v))(size) - 1)) & \ 48 ~((__typeof__(v))(size) - 1)) 49 50 /* Round down the even multiple of size, size has to be a multiple of 2 */ 51 #define ROUNDDOWN(v, size) ((v) & ~((__typeof__(v))(size) - 1)) 52 53 /* x has to be of an unsigned type */ 54 #define IS_POWER_OF_TWO(x) (((x) != 0) && (((x) & (~(x) + 1)) == (x))) 55 56 #define ALIGNMENT_IS_OK(p, type) \ 57 (((uintptr_t)(p) & (__alignof__(type) - 1)) == 0) 58 59 #define TO_STR(x) _TO_STR(x) 60 #define _TO_STR(x) #x 61 62 #define container_of(ptr, type, member) \ 63 (__extension__({ \ 64 const typeof(((type *)0)->member) *__ptr = (ptr); \ 65 (type *)((unsigned long)(__ptr) - offsetof(type, member)); \ 66 })) 67 68 #define MEMBER_SIZE(type, member) sizeof(((type *)0)->member) 69 70 #ifdef ASM 71 #define BIT32(nr) (1 << (nr)) 72 #define BIT64(nr) (1 << (nr)) 73 #define SHIFT_U32(v, shift) ((v) << (shift)) 74 #define SHIFT_U64(v, shift) ((v) << (shift)) 75 #else 76 #define BIT32(nr) (UINT32_C(1) << (nr)) 77 #define BIT64(nr) (UINT64_C(1) << (nr)) 78 #define SHIFT_U32(v, shift) ((uint32_t)(v) << (shift)) 79 #define SHIFT_U64(v, shift) ((uint64_t)(v) << (shift)) 80 #endif 81 #define BIT(nr) BIT32(nr) 82 83 /* 84 * Create a contiguous bitmask starting at bit position @l and ending at 85 * position @h. For example 86 * GENMASK_64(39, 21) gives us the 64bit vector 0x000000ffffe00000. 87 */ 88 #define GENMASK_32(h, l) \ 89 (((~UINT32_C(0)) << (l)) & (~UINT32_C(0) >> (32 - 1 - (h)))) 90 91 #define GENMASK_64(h, l) \ 92 (((~UINT64_C(0)) << (l)) & (~UINT64_C(0) >> (64 - 1 - (h)))) 93 94 #endif /*UTIL_H*/ 95