| /* |
| * Copyright 2013 Google Inc. |
| * |
| * See file CREDITS for list of people who contributed to this |
| * 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; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <libpayload.h> |
| |
| #include "drivers/flash/flash.h" |
| #include "image/fmap.h" |
| #include "image/index.h" |
| |
| const SectionIndex *index_from_fmap(const FmapArea *area) |
| { |
| if (area->size < sizeof(uint32_t)) { |
| printf("FMAP section too small.\n"); |
| return NULL; |
| } |
| SectionIndex *index = flash_read(area->offset, sizeof(uint32_t)); |
| |
| uint32_t index_size = (index->count * 2 + 1) * sizeof(uint32_t); |
| if (area->size < index_size) { |
| printf("FMAP section too small.\n"); |
| return NULL; |
| } |
| return flash_read(area->offset, index_size); |
| } |
| |
| const void *index_subsection(const FmapArea *area, const int entry, |
| uint32_t *entry_size) |
| { |
| const SectionIndex *index = index_from_fmap(area); |
| if (index->count <= entry) { |
| printf("Asked for index entry %d, but there are only %d.\n", |
| entry, index->count); |
| return NULL; |
| } |
| uint32_t offset = index->entries[entry].offset; |
| uint32_t size = index->entries[entry].size; |
| if (offset >= area->size || offset + size > area->size) { |
| printf("Index entry %d beyond end of FMAP section.\n", entry); |
| return NULL; |
| } |
| if (entry_size) |
| *entry_size = size; |
| return flash_read(area->offset + offset, size); |
| } |