1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 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.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <string.h>
#include <console/console.h>
#include <cbfs.h>
#include <ip_checksum.h>
#include <device/device.h>
#include <cbmem.h>
#include "pei_data.h"
#include "sandybridge.h"
#include <spi.h>
#include <spi_flash.h>
struct mrc_data_container *next_mrc_block(struct mrc_data_container *mrc_cache)
{
/* MRC data blocks are aligned within the region */
u32 mrc_size = sizeof(*mrc_cache) + mrc_cache->mrc_data_size;
if (mrc_size & (MRC_DATA_ALIGN - 1UL)) {
mrc_size &= ~(MRC_DATA_ALIGN - 1UL);
mrc_size += MRC_DATA_ALIGN;
}
u8 *region_ptr = (u8*)mrc_cache;
region_ptr += mrc_size;
return (struct mrc_data_container *)region_ptr;
}
int is_mrc_cache(struct mrc_data_container *mrc_cache)
{
return (!!mrc_cache) && (mrc_cache->mrc_signature == MRC_DATA_SIGNATURE);
}
/* Right now, the offsets for the MRC cache area are hard-coded in the
* northbridge Kconfig. In order to make this more flexible, there are
* a number of options:
* - Have each mainboard Kconfig supply a hard-coded offset
* - For ChromeOS devices: implement native FMAP
* - For non-ChromeOS devices: use CBFS
*/
u32 get_mrc_cache_region(struct mrc_data_container **mrc_region_ptr)
{
u32 region_size = CONFIG_MRC_CACHE_SIZE;
*mrc_region_ptr = (struct mrc_data_container *)
(CONFIG_MRC_CACHE_BASE + CONFIG_MRC_CACHE_LOCATION);
return region_size;
}
/* find the first empty field in the MRC cache area. If there's none, return
* the first region. By testing for emptiness caller can detect if flash
* needs to be erased.
*
* FIXME: that interface is crap
*/
struct mrc_data_container *find_next_mrc_cache(void)
{
u32 entry_id = 0;
struct mrc_data_container *mrc_cache = NULL;
u32 region_size = get_mrc_cache_region(&mrc_cache);
void *mrc_region = (void*)mrc_cache;
if (mrc_cache == NULL) {
printk(BIOS_ERR, "%s: could not find mrc cache area\n", __func__);
return NULL;
}
/* Search for the first empty entry in the region */
while (is_mrc_cache(mrc_cache)) {
entry_id++;
mrc_cache = next_mrc_block(mrc_cache);
/* If we exceed the defined area, move to front */
if ((void*)mrc_cache >= (void*)(mrc_region + region_size)) {
mrc_cache = (struct mrc_data_container *)mrc_region;
break;
}
}
printk(BIOS_DEBUG, "picked entry %u from cache block when looking for empty block\n", entry_id);
return mrc_cache;
}
struct mrc_data_container *find_current_mrc_cache(void)
{
u32 entry_id = 0;
struct mrc_data_container *mrc_next, *mrc_cache = NULL;
u32 region_size = get_mrc_cache_region(&mrc_cache);
void *mrc_region = (void*)mrc_cache;
mrc_next = mrc_cache;
if (mrc_cache == NULL) {
printk(BIOS_ERR, "%s: could not find mrc cache area\n", __func__);
return NULL;
}
if (mrc_cache->mrc_data_size == -1UL) {
printk(BIOS_ERR, "%s: MRC cache not initialized?\n", __func__);
/* return non-initialized cache, so we can discern this
* from having no cache area at all
*/
return mrc_cache;
}
/* Search for the last filled entry in the region */
while (is_mrc_cache(mrc_next)) {
entry_id++;
mrc_cache = mrc_next;
mrc_next = next_mrc_block(mrc_cache);
/* Stay in the mrc data region */
if ((void*)mrc_next >= (void*)(mrc_region + region_size))
break;
}
entry_id--;
if (entry_id == -1) {
printk(BIOS_ERR, "%s: No valid MRC cache found.\n", __func__);
return NULL;
}
/* Verify checksum */
if (mrc_cache->mrc_checksum !=
compute_ip_checksum(mrc_cache->mrc_data,
mrc_cache->mrc_data_size)) {
printk(BIOS_ERR, "%s: MRC cache checksum mismatch\n", __func__);
return NULL;
}
printk(BIOS_DEBUG, "picked entry %u from cache block\n", entry_id);
return mrc_cache;
}
/* SPI code needs malloc/free.
* Also unknown if writing flash from XIP-flash code is a good idea
*/
#if !defined(__PRE_RAM__)
void update_mrc_cache(void)
{
printk(BIOS_DEBUG, "Updating MRC cache data.\n");
struct mrc_data_container *current = cbmem_find(CBMEM_ID_MRCDATA);
if (!current) {
printk(BIOS_ERR, "No MRC cache in cbmem. Can't update flash.\n");
return;
}
if (current->mrc_data_size == -1) {
printk(BIOS_ERR, "MRC cache data in cbmem invalid.\n");
return;
}
/*
* we need to:
*/
// 0. compare MRC data to last mrc-cache block (exit if same)
struct mrc_data_container *cache;
if ((cache = find_current_mrc_cache()) == NULL) {
printk(BIOS_DEBUG, "Failure looking for current last block.\n");
return;
}
if ((cache->mrc_data_size == current->mrc_data_size) &&
(memcmp(cache, current, cache->mrc_data_size) == 0)) {
printk(BIOS_DEBUG,
"MRC data in flash is up to date. No update.\n");
return;
}
// 1. use spi_flash_probe() to find the flash, then
spi_init();
struct spi_flash *flash = spi_flash_probe(0, 0, 1000000, SPI_MODE_3);
if (!flash) {
printk(BIOS_DEBUG, "Could not find SPI device\n");
return;
}
// 2. look up the first unused block
cache = find_next_mrc_cache();
if (!cache) {
printk(BIOS_DEBUG, "Could not find MRC cache area\n");
return;
}
// 3. if no such place exists, erase entire mrc-cache range & use block 0
if (cache->mrc_data_size != -1) {
printk(BIOS_DEBUG, "We need to erase the MRC cache region\n");
flash->erase(flash, CONFIG_MRC_CACHE_LOCATION, CONFIG_MRC_CACHE_SIZE);
/* we know we can start at the beginning again */
get_mrc_cache_region(&cache);
}
// 4. write mrc data with flash->write()
printk(BIOS_DEBUG, "Finally: write MRC cache update to flash\n");
flash->write(flash, (u32)(((void*)cache)-CONFIG_MRC_CACHE_BASE), current->mrc_data_size + sizeof(*current), current);
}
#endif
|
