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