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75 lines
2.3 KiB
75 lines
2.3 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __UTIL_H
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#define __UTIL_H
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#include <plat/plat.h>
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#include "toolchain.h"
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#include <limits.h>
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#include <stdbool.h>
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#include <stddef.h>
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#define ARRAY_SIZE(a) (sizeof((a)) / sizeof((a)[0]))
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#define UNUSED_PARAM(param) (void) (param)
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#ifndef alignof
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#define alignof(type) offsetof(struct { char x; type field; }, field)
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#endif
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/*
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* this macro does not consume bytes from any segment; if condition is true it is a zero-sized array;
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* if some compilers do try to allocate space for them we create a special section for those checks
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* and discard this section at link time
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*/
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#define C_STATIC_ASSERT(name, condition) \
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static const char __attribute__((used, section(".static_assert"))) \
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static_assert_check_ ## name [(condition) ? 0 : -1] = {}
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#define unlikely(x) (x)
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#define likely(x) (x)
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#define container_of(addr, struct_name, field_name) \
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((struct_name *)((char *)(addr) - offsetof(struct_name, field_name)))
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static inline bool IS_POWER_OF_TWO(unsigned int n)
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{
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return !(n & (n - 1));
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}
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static inline int LOG2_FLOOR(unsigned int n)
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{
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if (UNLIKELY(n == 0))
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return INT_MIN;
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// floor(log2(n)) = MSB(n) = (# of bits) - (# of leading zeros) - 1
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return 8 * sizeof(n) - CLZ(n) - 1;
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}
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static inline int LOG2_CEIL(unsigned int n)
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{
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return IS_POWER_OF_TWO(n) ? LOG2_FLOOR(n) : LOG2_FLOOR(n) + 1;
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}
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#ifdef SYSCALL_VARARGS_PARAMS_PASSED_AS_PTRS
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#define VA_LIST_TO_INTEGER(__vl) ((uintptr_t)(&__vl))
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#define INTEGER_TO_VA_LIST(__ptr) (*(va_list*)(__ptr))
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#else
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#define VA_LIST_TO_INTEGER(__vl) (*(uintptr_t*)(&__vl))
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#define INTEGER_TO_VA_LIST(__ptr) ({uintptr_t tmp = __ptr; (*(va_list*)(&tmp)); })
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#endif
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#endif /* __UTIL_H */
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