1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef __UTIL_H 18 #define __UTIL_H 19 #include <plat/inc/plat.h> 20 #include "toolchain.h" 21 #include <limits.h> 22 #include <stdbool.h> 23 #include <stddef.h> 24 25 #define ARRAY_SIZE(a) (sizeof((a)) / sizeof((a)[0])) 26 27 #define UNUSED_PARAM(param) (void) (param) 28 29 #ifndef alignof 30 #define alignof(type) offsetof(struct { char x; type field; }, field) 31 #endif 32 33 #define container_of(addr, struct_name, field_name) \ 34 ((struct_name *)((char *)(addr) - offsetof(struct_name, field_name))) 35 36 static inline bool IS_POWER_OF_TWO(unsigned int n) 37 { 38 return !(n & (n - 1)); 39 } 40 41 static inline int LOG2_FLOOR(unsigned int n) 42 { 43 if (UNLIKELY(n == 0)) 44 return INT_MIN; 45 46 // floor(log2(n)) = MSB(n) = (# of bits) - (# of leading zeros) - 1 47 return 8 * sizeof(n) - CLZ(n) - 1; 48 } 49 50 static inline int LOG2_CEIL(unsigned int n) 51 { 52 return IS_POWER_OF_TWO(n) ? LOG2_FLOOR(n) : LOG2_FLOOR(n) + 1; 53 } 54 55 #ifdef SYSCALL_VARARGS_PARAMS_PASSED_AS_PTRS 56 #define VA_LIST_TO_INTEGER(__vl) ((uintptr_t)(&__vl)) 57 #define INTEGER_TO_VA_LIST(__ptr) (*(va_list*)(__ptr)) 58 #else 59 #define VA_LIST_TO_INTEGER(__vl) (*(uintptr_t*)(&__vl)) 60 #define INTEGER_TO_VA_LIST(__ptr) ({uintptr_t tmp = __ptr; (*(va_list*)(&tmp)); }) 61 #endif 62 63 #endif /* __UTIL_H */ 64
