1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * Copyright (c) 2014, STMicroelectronics International N.V. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright notice, 13 * this list of conditions and the following disclaimer in the documentation 14 * and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 #ifndef UTIL_H 29 #define UTIL_H 30 31 #include <compiler.h> 32 #include <stdint.h> 33 34 #define SIZE_4K UINTPTR_C(0x1000) 35 #define SIZE_1M UINTPTR_C(0x100000) 36 #define SIZE_2M UINTPTR_C(0x200000) 37 #define SIZE_4M UINTPTR_C(0x400000) 38 #define SIZE_8M UINTPTR_C(0x800000) 39 #define SIZE_2G UINTPTR_C(0x80000000) 40 41 #ifndef MAX 42 #define MAX(a, b) \ 43 (__extension__({ __typeof__(a) _a = (a); \ 44 __typeof__(b) _b = (b); \ 45 _a > _b ? _a : _b; })) 46 47 #define MIN(a, b) \ 48 (__extension__({ __typeof__(a) _a = (a); \ 49 __typeof__(b) _b = (b); \ 50 _a < _b ? _a : _b; })) 51 #endif 52 53 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 54 55 #ifndef ASM 56 /* Round up the even multiple of size, size has to be a multiple of 2 */ 57 #define ROUNDUP(v, size) (((v) + ((__typeof__(v))(size) - 1)) & \ 58 ~((__typeof__(v))(size) - 1)) 59 60 /* Round down the even multiple of size, size has to be a multiple of 2 */ 61 #define ROUNDDOWN(v, size) ((v) & ~((__typeof__(v))(size) - 1)) 62 #else 63 #define ROUNDUP(x, y) ((((x) + (y) - 1) / (y)) * (y)) 64 #define ROUNDDOWN(x, y) (((x) / (y)) * (y)) 65 #endif 66 67 /* x has to be of an unsigned type */ 68 #define IS_POWER_OF_TWO(x) (((x) != 0) && (((x) & (~(x) + 1)) == (x))) 69 70 #define ALIGNMENT_IS_OK(p, type) \ 71 (((uintptr_t)(p) & (__alignof__(type) - 1)) == 0) 72 73 #define TO_STR(x) _TO_STR(x) 74 #define _TO_STR(x) #x 75 76 #define container_of(ptr, type, member) \ 77 (__extension__({ \ 78 const typeof(((type *)0)->member) *__ptr = (ptr); \ 79 (type *)((unsigned long)(__ptr) - offsetof(type, member)); \ 80 })) 81 82 #define MEMBER_SIZE(type, member) sizeof(((type *)0)->member) 83 84 #ifdef ASM 85 #define BIT32(nr) (1 << (nr)) 86 #define BIT64(nr) (1 << (nr)) 87 #define SHIFT_U32(v, shift) ((v) << (shift)) 88 #define SHIFT_U64(v, shift) ((v) << (shift)) 89 #else 90 #define BIT32(nr) (UINT32_C(1) << (nr)) 91 #define BIT64(nr) (UINT64_C(1) << (nr)) 92 #define SHIFT_U32(v, shift) ((uint32_t)(v) << (shift)) 93 #define SHIFT_U64(v, shift) ((uint64_t)(v) << (shift)) 94 #endif 95 #define BIT(nr) BIT32(nr) 96 97 /* 98 * Create a contiguous bitmask starting at bit position @l and ending at 99 * position @h. For example 100 * GENMASK_64(39, 21) gives us the 64bit vector 0x000000ffffe00000. 101 */ 102 #define GENMASK_32(h, l) \ 103 (((~UINT32_C(0)) << (l)) & (~UINT32_C(0) >> (32 - 1 - (h)))) 104 105 #define GENMASK_64(h, l) \ 106 (((~UINT64_C(0)) << (l)) & (~UINT64_C(0) >> (64 - 1 - (h)))) 107 108 /* 109 * Checking overflow for addition, subtraction and multiplication. Result 110 * of operation is stored in res which is a pointer to some kind of 111 * integer. 112 * 113 * The macros return true if an overflow occurred and *res is undefined. 114 */ 115 #define ADD_OVERFLOW(a, b, res) __compiler_add_overflow((a), (b), (res)) 116 #define SUB_OVERFLOW(a, b, res) __compiler_sub_overflow((a), (b), (res)) 117 #define MUL_OVERFLOW(a, b, res) __compiler_mul_overflow((a), (b), (res)) 118 119 /* Return a signed +1, 0 or -1 value based on data comparison */ 120 #define CMP_TRILEAN(a, b) \ 121 (__extension__({ \ 122 __typeof__(a) _a = (a); \ 123 __typeof__(b) _b = (b); \ 124 \ 125 _a > _b ? 1 : _a < _b ? -1 : 0; \ 126 })) 127 128 #endif /*UTIL_H*/ 129