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- /*
- * This file is part of the coreboot project.
- *
- * Copyright 2015 Google Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
- #ifndef _MEM_POOL_H_
- #define _MEM_POOL_H_
-
- #include <stddef.h>
- #include <stdint.h>
-
- /*
- * The memory pool allows one to allocate memory from a fixed size buffer
- * that also allows freeing semantics for reuse. However, the current
- * limitation is that the most recent allocation is the only one that
- * can be freed. If one tries to free any allocation that isn't the
- * most recently allocated it will result in a leak within the memory pool.
- *
- * The memory returned by allocations are at least 8 byte aligned. Note
- * that this requires the backing buffer to start on at least an 8 byte
- * alignment.
- */
-
- struct mem_pool {
- uint8_t *buf;
- size_t size;
- uint8_t *last_alloc;
- size_t free_offset;
- };
-
- #define MEM_POOL_INIT(buf_, size_) \
- { \
- .buf = (buf_), \
- .size = (size_), \
- .last_alloc = NULL, \
- .free_offset = 0, \
- }
-
- static inline void mem_pool_reset(struct mem_pool *mp)
- {
- mp->last_alloc = NULL;
- mp->free_offset = 0;
- }
-
- /* Initialize a memory pool. */
- static inline void mem_pool_init(struct mem_pool *mp, void *buf, size_t sz)
- {
- mp->buf = buf;
- mp->size = sz;
- mem_pool_reset(mp);
- }
-
- /* Allocate requested size from the memory pool. NULL returned on error. */
- void *mem_pool_alloc(struct mem_pool *mp, size_t sz);
-
- /* Free allocation from memory pool. */
- void mem_pool_free(struct mem_pool *mp, void *alloc);
-
- #endif /* _MEM_POOL_H_ */
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