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coreboot-kgpe-d16/src/commonlib/mem_pool.c

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coreboot: add memory pool infrastructure The memory pool infrastructure provides an allocator with very simple free()ing semantics: only the most recent allocation can be freed from the pool. However, it can be reset and when not used any longer providing the entire region for future allocations. Change-Id: I5ae9ab35bb769d78bbc2866c5ae3b5ce2cdce5fa Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/9129 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2015-03-26 18:29:12 +01:00
/*
* 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.
*/
coreboot: introduce commonlib Instead of reaching into src/include and re-writing code allow for cleaner code sharing within coreboot and its utilities. The additional thing needed at this point is for the utilities to provide a printk() declaration within a <console/console.h> file. That way code which uses printk() can than be mapped properly to verbosity of utility parameters. Change-Id: I9e46a279569733336bc0a018aed96bc924c07cdd Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/11592 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2015-09-08 20:34:43 +02:00
#include <commonlib/mem_pool.h>
coreboot: add memory pool infrastructure The memory pool infrastructure provides an allocator with very simple free()ing semantics: only the most recent allocation can be freed from the pool. However, it can be reset and when not used any longer providing the entire region for future allocations. Change-Id: I5ae9ab35bb769d78bbc2866c5ae3b5ce2cdce5fa Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/9129 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2015-03-26 18:29:12 +01:00
#include <stdlib.h>
void *mem_pool_alloc(struct mem_pool *mp, size_t sz)
{
void *p;
/* Make all allocations be at least 8 byte aligned. */
sz = ALIGN_UP(sz, 8);
/* Determine if any space available. */
if ((mp->size - mp->free_offset) < sz)
return NULL;
p = &mp->buf[mp->free_offset];
mp->free_offset += sz;
mp->last_alloc = p;
return p;
}
void mem_pool_free(struct mem_pool *mp, void *p)
{
/* Determine if p was the most recent allocation. */
if (p == NULL || mp->last_alloc != p)
return;
mp->free_offset = mp->last_alloc - mp->buf;
/* No way to track allocation before this one. */
mp->last_alloc = NULL;
}