| Aaron Durbin | 127525c | 2015-03-26 12:29:12 -0500 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2015 Google Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc. |
| 18 | */ |
| 19 | |
| 20 | #include <mem_pool.h> |
| 21 | #include <stdlib.h> |
| 22 | |
| 23 | void *mem_pool_alloc(struct mem_pool *mp, size_t sz) |
| 24 | { |
| 25 | void *p; |
| 26 | |
| 27 | /* Make all allocations be at least 8 byte aligned. */ |
| 28 | sz = ALIGN_UP(sz, 8); |
| 29 | |
| 30 | /* Determine if any space available. */ |
| 31 | if ((mp->size - mp->free_offset) < sz) |
| 32 | return NULL; |
| 33 | |
| 34 | p = &mp->buf[mp->free_offset]; |
| 35 | |
| 36 | mp->free_offset += sz; |
| 37 | mp->last_alloc = p; |
| 38 | |
| 39 | return p; |
| 40 | } |
| 41 | |
| 42 | void mem_pool_free(struct mem_pool *mp, void *p) |
| 43 | { |
| 44 | /* Determine if p was the most recent allocation. */ |
| 45 | if (p == NULL || mp->last_alloc != p) |
| 46 | return; |
| 47 | |
| 48 | mp->free_offset = mp->last_alloc - mp->buf; |
| 49 | /* No way to track allocation before this one. */ |
| 50 | mp->last_alloc = NULL; |
| 51 | } |