blob: 52496000cf724aebaf0eef239be89a511f8718f7 [file] [log] [blame]
 /* * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #ifndef __UTILS_DEF_H__ #define __UTILS_DEF_H__ /* Compute the number of elements in the given array */ #define ARRAY_SIZE(a) \ (sizeof(a) / sizeof((a)[0])) #define IS_POWER_OF_TWO(x) \ (((x) & ((x) - 1)) == 0) #define SIZE_FROM_LOG2_WORDS(n) (4 << (n)) #define BIT(nr) (1UL << (nr)) #define MIN(x, y) __extension__ ({ \ __typeof__(x) _x = (x); \ __typeof__(y) _y = (y); \ (void)(&_x == &_y); \ _x < _y ? _x : _y; \ }) #define MAX(x, y) __extension__ ({ \ __typeof__(x) _x = (x); \ __typeof__(y) _y = (y); \ (void)(&_x == &_y); \ _x > _y ? _x : _y; \ }) /* * The round_up() macro rounds up a value to the given boundary in a * type-agnostic yet type-safe manner. The boundary must be a power of two. * In other words, it computes the smallest multiple of boundary which is * greater than or equal to value. * * round_down() is similar but rounds the value down instead. */ #define round_boundary(value, boundary) \ ((__typeof__(value))((boundary) - 1)) #define round_up(value, boundary) \ ((((value) - 1) | round_boundary(value, boundary)) + 1) #define round_down(value, boundary) \ ((value) & ~round_boundary(value, boundary)) /* * Evaluates to 1 if (ptr + inc) overflows, 0 otherwise. * Both arguments must be unsigned pointer values (i.e. uintptr_t). */ #define check_uptr_overflow(ptr, inc) \ (((ptr) > UINTPTR_MAX - (inc)) ? 1 : 0) /* * For those constants to be shared between C and other sources, apply a 'u' * or 'ull' suffix to the argument only in C, to avoid undefined or unintended * behaviour. * * The GNU assembler and linker do not support the 'u' and 'ull' suffix (it * causes the build process to fail) therefore the suffix is omitted when used * in linker scripts and assembler files. */ #if defined(__LINKER__) || defined(__ASSEMBLY__) # define U(_x) (_x) # define ULL(_x) (_x) #else # define U(_x) (_x##u) # define ULL(_x) (_x##ull) #endif #endif /* __UTILS_DEF_H__ */