| /* |
| * Copyright (c) 2011-2014, Wind River Systems, Inc. |
| * |
| * 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. |
| */ |
| |
| /** |
| * @file |
| * @brief Misc utilities |
| * |
| * Misc utilities usable by nanokernel, microkernel, and application code. |
| */ |
| |
| #ifndef _UTIL__H_ |
| #define _UTIL__H_ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifndef _ASMLANGUAGE |
| |
| /* Helper to pass a int as a pointer or vice-versa. |
| * Those are available for 32 bits architectures: |
| */ |
| #define POINTER_TO_UINT(x) ((uint32_t) (x)) |
| #define UINT_TO_POINTER(x) ((void *) (x)) |
| #define POINTER_TO_INT(x) ((int32_t) (x)) |
| #define INT_TO_POINTER(x) ((void *) (x)) |
| |
| #define ARRAY_SIZE(array) ((unsigned long)(sizeof(array) / sizeof((array)[0]))) |
| #define CONTAINER_OF(ptr, type, field) \ |
| ((type *)(((char *)(ptr)) - offsetof(type, field))) |
| |
| /* round "x" up/down to next multiple of "align" (which must be a power of 2) */ |
| #define ROUND_UP(x, align) \ |
| (((unsigned long)(x) + ((unsigned long)align - 1)) & \ |
| ~((unsigned long)align - 1)) |
| #define ROUND_DOWN(x, align) ((unsigned long)(x) & ~((unsigned long)align - 1)) |
| |
| #ifdef INLINED |
| #define INLINE inline |
| #else |
| #define INLINE |
| #endif |
| |
| #ifndef max |
| #define max(a, b) (((a) > (b)) ? (a) : (b)) |
| #endif |
| |
| #ifndef min |
| #define min(a, b) (((a) < (b)) ? (a) : (b)) |
| #endif |
| |
| static inline int is_power_of_two(unsigned int x) |
| { |
| return (x != 0) && !(x & (x - 1)); |
| } |
| #endif /* !_ASMLANGUAGE */ |
| |
| /* KB, MB, GB */ |
| #define KB(x) ((x) << 10) |
| #define MB(x) (KB(x) << 10) |
| #define GB(x) (MB(x) << 10) |
| |
| /* KHZ, MHZ */ |
| #define KHZ(x) ((x) * 1000) |
| #define MHZ(x) (KHZ(x) * 1000) |
| |
| #define BIT(n) (1UL << (n)) |
| |
| #define BIT_MASK(n) (BIT(n) - 1) |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _UTIL__H_ */ |