| /* |
| * This file is part of the coreboot project. |
| * |
| * 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. |
| */ |
| |
| #include <stdlib.h> |
| #include <cbmem.h> |
| |
| #if CONFIG(CBMEM_TOP_BACKUP) |
| |
| void *cbmem_top(void) |
| { |
| static void *cbmem_top_backup; |
| void *top_backup; |
| |
| if (ENV_RAMSTAGE && cbmem_top_backup != NULL) |
| return cbmem_top_backup; |
| |
| /* Top of CBMEM is at highest usable DRAM address below 4GiB. */ |
| top_backup = (void *)restore_top_of_low_cacheable(); |
| |
| if (ENV_RAMSTAGE) |
| cbmem_top_backup = top_backup; |
| |
| return top_backup; |
| } |
| |
| #endif /* CBMEM_TOP_BACKUP */ |