98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/*
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* Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __UTILS_DEF_H__
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#define __UTILS_DEF_H__
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/* Compute the number of elements in the given array */
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#define ARRAY_SIZE(a) \
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(sizeof(a) / sizeof((a)[0]))
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#define IS_POWER_OF_TWO(x) \
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(((x) & ((x) - 1)) == 0)
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#define SIZE_FROM_LOG2_WORDS(n) (4 << (n))
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#define BIT(nr) (1UL << (nr))
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#define MIN(x, y) __extension__ ({ \
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__typeof__(x) _x = (x); \
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__typeof__(y) _y = (y); \
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(void)(&_x == &_y); \
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_x < _y ? _x : _y; \
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})
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#define MAX(x, y) __extension__ ({ \
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__typeof__(x) _x = (x); \
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__typeof__(y) _y = (y); \
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(void)(&_x == &_y); \
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_x > _y ? _x : _y; \
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})
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/*
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* The round_up() macro rounds up a value to the given boundary in a
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* type-agnostic yet type-safe manner. The boundary must be a power of two.
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* In other words, it computes the smallest multiple of boundary which is
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* greater than or equal to value.
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*
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* round_down() is similar but rounds the value down instead.
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*/
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#define round_boundary(value, boundary) \
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((__typeof__(value))((boundary) - 1))
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#define round_up(value, boundary) \
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((((value) - 1) | round_boundary(value, boundary)) + 1)
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#define round_down(value, boundary) \
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((value) & ~round_boundary(value, boundary))
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/*
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* Evaluates to 1 if (ptr + inc) overflows, 0 otherwise.
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* Both arguments must be unsigned pointer values (i.e. uintptr_t).
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*/
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#define check_uptr_overflow(ptr, inc) \
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(((ptr) > UINTPTR_MAX - (inc)) ? 1 : 0)
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/*
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* For those constants to be shared between C and other sources, apply a 'ull'
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* suffix to the argument only in C, to avoid undefined or unintended behaviour.
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*
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* The GNU assembler and linker do not support the 'ull' suffix (it causes the
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* build process to fail) therefore the suffix is omitted when used in linker
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* scripts and assembler files.
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*/
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#if defined(__LINKER__) || defined(__ASSEMBLY__)
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# define ULL(_x) (_x)
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#else
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# define ULL(_x) (_x##ull)
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#endif
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#endif /* __UTILS_DEF_H__ */
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