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