Gabe Black | 396b072 | 2013-09-26 16:22:09 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
Aaron Durbin | c6588c5 | 2015-05-15 13:15:34 -0500 | [diff] [blame] | 4 | * Copyright 2015 Google Inc. |
Gabe Black | 396b072 | 2013-09-26 16:22:09 -0700 | [diff] [blame] | 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. |
Gabe Black | 396b072 | 2013-09-26 16:22:09 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
Aaron Durbin | c6588c5 | 2015-05-15 13:15:34 -0500 | [diff] [blame] | 16 | #include <boot_device.h> |
Aaron Durbin | 899d13d | 2015-05-15 23:39:23 -0500 | [diff] [blame] | 17 | #include <cbfs.h> |
| 18 | #include <endian.h> |
| 19 | #include <stdlib.h> |
Gabe Black | 396b072 | 2013-09-26 16:22:09 -0700 | [diff] [blame] | 20 | |
Aaron Durbin | c6588c5 | 2015-05-15 13:15:34 -0500 | [diff] [blame] | 21 | /* The ROM is memory mapped just below 4GiB. Form a pointer for the base. */ |
Stefan Reinauer | fb82ebe | 2015-08-04 11:14:17 -0700 | [diff] [blame] | 22 | #define rom_base ((void *)(uintptr_t)(0x100000000ULL-CONFIG_ROM_SIZE)) |
Gabe Black | 396b072 | 2013-09-26 16:22:09 -0700 | [diff] [blame] | 23 | |
Aaron Durbin | c6588c5 | 2015-05-15 13:15:34 -0500 | [diff] [blame] | 24 | static const struct mem_region_device boot_dev = |
| 25 | MEM_REGION_DEV_INIT(rom_base, CONFIG_ROM_SIZE); |
| 26 | |
| 27 | const struct region_device *boot_device_ro(void) |
Gabe Black | 396b072 | 2013-09-26 16:22:09 -0700 | [diff] [blame] | 28 | { |
Aaron Durbin | c6588c5 | 2015-05-15 13:15:34 -0500 | [diff] [blame] | 29 | return &boot_dev.rdev; |
Gabe Black | 396b072 | 2013-09-26 16:22:09 -0700 | [diff] [blame] | 30 | } |
Aaron Durbin | 899d13d | 2015-05-15 23:39:23 -0500 | [diff] [blame] | 31 | |
Aaron Durbin | 6d720f3 | 2015-12-08 17:00:23 -0600 | [diff] [blame] | 32 | static int cbfs_master_header_props(struct cbfs_props *props) |
Aaron Durbin | 899d13d | 2015-05-15 23:39:23 -0500 | [diff] [blame] | 33 | { |
| 34 | struct cbfs_header header; |
| 35 | int32_t offset; |
| 36 | const struct region_device *bdev; |
| 37 | |
| 38 | bdev = boot_device_ro(); |
| 39 | |
| 40 | rdev_readat(bdev, &offset, CONFIG_ROM_SIZE - sizeof(offset), |
| 41 | sizeof(offset)); |
| 42 | |
| 43 | /* The offset is relative to the end of the media. */ |
| 44 | offset += CONFIG_ROM_SIZE; |
| 45 | |
| 46 | rdev_readat(bdev, &header , offset, sizeof(header)); |
| 47 | |
| 48 | header.magic = ntohl(header.magic); |
| 49 | header.romsize = ntohl(header.romsize); |
| 50 | header.bootblocksize = ntohl(header.bootblocksize); |
Aaron Durbin | 899d13d | 2015-05-15 23:39:23 -0500 | [diff] [blame] | 51 | header.offset = ntohl(header.offset); |
| 52 | |
| 53 | if (header.magic != CBFS_HEADER_MAGIC) |
| 54 | return -1; |
| 55 | |
Aaron Durbin | 899d13d | 2015-05-15 23:39:23 -0500 | [diff] [blame] | 56 | props->offset = header.offset; |
| 57 | if (CONFIG_ROM_SIZE != header.romsize) |
Nico Huber | 65e33c0 | 2015-12-28 20:17:13 +0100 | [diff] [blame] | 58 | props->offset += CONFIG_ROM_SIZE - header.romsize; |
| 59 | props->size = CONFIG_ROM_SIZE; |
Aaron Durbin | 899d13d | 2015-05-15 23:39:23 -0500 | [diff] [blame] | 60 | props->size -= props->offset; |
| 61 | props->size -= header.bootblocksize; |
Patrick Georgi | 4d3e4c4 | 2015-07-14 22:28:27 +0200 | [diff] [blame] | 62 | props->size = ALIGN_DOWN(props->size, 64); |
Aaron Durbin | 899d13d | 2015-05-15 23:39:23 -0500 | [diff] [blame] | 63 | |
Aaron Durbin | 899d13d | 2015-05-15 23:39:23 -0500 | [diff] [blame] | 64 | return 0; |
| 65 | } |
Aaron Durbin | 6d720f3 | 2015-12-08 17:00:23 -0600 | [diff] [blame] | 66 | |
| 67 | const struct cbfs_locator cbfs_master_header_locator = { |
| 68 | .name = "Master Header Locator", |
| 69 | .locate = cbfs_master_header_props, |
| 70 | }; |