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1 /* Copyright (c) 2011 The Chromium OS Authors. All rights reserved. | 1 /* Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
2 * Use of this source code is governed by a BSD-style license that can be | 2 * Use of this source code is governed by a BSD-style license that can be |
3 * found in the LICENSE file. | 3 * found in the LICENSE file. |
4 */ | 4 */ |
5 | 5 |
6 /* Non-volatile storage routines. | 6 /* Non-volatile storage routines. |
7 */ | 7 */ |
8 | 8 |
9 #include "utility.h" | 9 #include "utility.h" |
10 #include "vboot_common.h" | 10 #include "vboot_common.h" |
11 #include "vboot_nvstorage.h" | 11 #include "vboot_nvstorage.h" |
12 | 12 |
13 /* Constants for NV storage. We use this rather than structs and | 13 /* Constants for NV storage. We use this rather than structs and |
14 * bitfields so the data format is consistent across platforms and | 14 * bitfields so the data format is consistent across platforms and |
15 * compilers. */ | 15 * compilers. */ |
16 #define HEADER_OFFSET 0 | 16 #define HEADER_OFFSET 0 |
17 #define HEADER_MASK 0xC0 | 17 #define HEADER_MASK 0xC0 |
18 #define HEADER_SIGNATURE 0x40 | 18 #define HEADER_SIGNATURE 0x40 |
19 #define HEADER_FIRMWARE_SETTINGS_RESET 0x20 | 19 #define HEADER_FIRMWARE_SETTINGS_RESET 0x20 |
20 #define HEADER_KERNEL_SETTINGS_RESET 0x10 | 20 #define HEADER_KERNEL_SETTINGS_RESET 0x10 |
21 | 21 |
22 #define BOOT_OFFSET 1 | 22 #define BOOT_OFFSET 1 |
23 #define BOOT_DEBUG_RESET_MODE 0x80 | 23 #define BOOT_DEBUG_RESET_MODE 0x80 |
24 #define BOOT_TRY_B_COUNT_MASK 0x0F | 24 #define BOOT_TRY_B_COUNT_MASK 0x0F |
25 | 25 |
26 #define RECOVERY_OFFSET 2 | 26 #define RECOVERY_OFFSET 2 |
27 #define LOCALIZATION_OFFSET 3 | 27 #define LOCALIZATION_OFFSET 3 |
28 | 28 |
29 #define FIRMWARE_FLAGS_OFFSET 5 | 29 #define FIRMWARE_FLAGS_OFFSET 5 |
30 #define FIRMWARE_TRIED_FIRMWARE_B 0x80 | 30 #define FIRMWARE_TEST_ERR_FUNC_MASK 0x38 |
31 #define FIRMWARE_FW_VERIFIED_KERNEL_KEY 0x40 | 31 #define FIRMWARE_TEST_ERR_FUNC_SHIFT 3 |
| 32 #define FIRMWARE_TEST_ERR_NUM_MASK 0x07 |
32 | 33 |
33 #define KERNEL_FIELD_OFFSET 11 | 34 #define KERNEL_FIELD_OFFSET 11 |
34 #define CRC_OFFSET 15 | 35 #define CRC_OFFSET 15 |
35 | 36 |
36 | 37 |
37 /* Return CRC-8 of the data, using x^8 + x^2 + x + 1 polynomial. A | 38 /* Return CRC-8 of the data, using x^8 + x^2 + x + 1 polynomial. A |
38 * table-based algorithm would be faster, but for only 15 bytes isn't | 39 * table-based algorithm would be faster, but for only 15 bytes isn't |
39 * worth the code size. */ | 40 * worth the code size. */ |
40 static uint8_t Crc8(const uint8_t* data, int len) { | 41 static uint8_t Crc8(const uint8_t* data, int len) { |
41 unsigned crc = 0; | 42 unsigned crc = 0; |
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118 *dest = raw[LOCALIZATION_OFFSET]; | 119 *dest = raw[LOCALIZATION_OFFSET]; |
119 return 0; | 120 return 0; |
120 | 121 |
121 case VBNV_KERNEL_FIELD: | 122 case VBNV_KERNEL_FIELD: |
122 *dest = (raw[KERNEL_FIELD_OFFSET] | 123 *dest = (raw[KERNEL_FIELD_OFFSET] |
123 | (raw[KERNEL_FIELD_OFFSET + 1] << 8) | 124 | (raw[KERNEL_FIELD_OFFSET + 1] << 8) |
124 | (raw[KERNEL_FIELD_OFFSET + 2] << 16) | 125 | (raw[KERNEL_FIELD_OFFSET + 2] << 16) |
125 | (raw[KERNEL_FIELD_OFFSET + 3] << 24)); | 126 | (raw[KERNEL_FIELD_OFFSET + 3] << 24)); |
126 return 0; | 127 return 0; |
127 | 128 |
128 case VBNV_TRIED_FIRMWARE_B: | 129 case VBNV_TEST_ERROR_FUNC: |
129 *dest = (raw[FIRMWARE_FLAGS_OFFSET] & FIRMWARE_TRIED_FIRMWARE_B ? 1 : 0); | 130 *dest = (raw[FIRMWARE_FLAGS_OFFSET] & FIRMWARE_TEST_ERR_FUNC_MASK) |
| 131 >> FIRMWARE_TEST_ERR_FUNC_SHIFT; |
130 return 0; | 132 return 0; |
131 | 133 |
132 case VBNV_FW_VERIFIED_KERNEL_KEY: | 134 case VBNV_TEST_ERROR_NUM: |
133 *dest = (raw[FIRMWARE_FLAGS_OFFSET] & FIRMWARE_FW_VERIFIED_KERNEL_KEY ? | 135 *dest = raw[FIRMWARE_FLAGS_OFFSET] & FIRMWARE_TEST_ERR_NUM_MASK; |
134 1 : 0); | |
135 return 0; | 136 return 0; |
136 | 137 |
137 default: | 138 default: |
138 return 1; | 139 return 1; |
139 } | 140 } |
140 } | 141 } |
141 | 142 |
142 | 143 |
143 int VbNvSet(VbNvContext* context, VbNvParam param, uint32_t value) { | 144 int VbNvSet(VbNvContext* context, VbNvParam param, uint32_t value) { |
144 uint8_t* raw = context->raw; | 145 uint8_t* raw = context->raw; |
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194 raw[LOCALIZATION_OFFSET] = (uint8_t)value; | 195 raw[LOCALIZATION_OFFSET] = (uint8_t)value; |
195 break; | 196 break; |
196 | 197 |
197 case VBNV_KERNEL_FIELD: | 198 case VBNV_KERNEL_FIELD: |
198 raw[KERNEL_FIELD_OFFSET] = (uint8_t)(value); | 199 raw[KERNEL_FIELD_OFFSET] = (uint8_t)(value); |
199 raw[KERNEL_FIELD_OFFSET + 1] = (uint8_t)(value >> 8); | 200 raw[KERNEL_FIELD_OFFSET + 1] = (uint8_t)(value >> 8); |
200 raw[KERNEL_FIELD_OFFSET + 2] = (uint8_t)(value >> 16); | 201 raw[KERNEL_FIELD_OFFSET + 2] = (uint8_t)(value >> 16); |
201 raw[KERNEL_FIELD_OFFSET + 3] = (uint8_t)(value >> 24); | 202 raw[KERNEL_FIELD_OFFSET + 3] = (uint8_t)(value >> 24); |
202 break; | 203 break; |
203 | 204 |
204 case VBNV_TRIED_FIRMWARE_B: | 205 case VBNV_TEST_ERROR_FUNC: |
205 if (value) | 206 raw[FIRMWARE_FLAGS_OFFSET] &= ~FIRMWARE_TEST_ERR_FUNC_MASK; |
206 raw[FIRMWARE_FLAGS_OFFSET] |= FIRMWARE_TRIED_FIRMWARE_B; | 207 raw[FIRMWARE_FLAGS_OFFSET] |= (value << FIRMWARE_TEST_ERR_FUNC_SHIFT) |
207 else | 208 & FIRMWARE_TEST_ERR_FUNC_MASK; |
208 raw[FIRMWARE_FLAGS_OFFSET] &= ~FIRMWARE_TRIED_FIRMWARE_B; | |
209 break; | 209 break; |
210 | 210 |
211 case VBNV_FW_VERIFIED_KERNEL_KEY: | 211 case VBNV_TEST_ERROR_NUM: |
212 if (value) | 212 raw[FIRMWARE_FLAGS_OFFSET] &= ~FIRMWARE_TEST_ERR_NUM_MASK; |
213 raw[FIRMWARE_FLAGS_OFFSET] |= FIRMWARE_FW_VERIFIED_KERNEL_KEY; | 213 raw[FIRMWARE_FLAGS_OFFSET] |= (value & FIRMWARE_TEST_ERR_NUM_MASK); |
214 else | |
215 raw[FIRMWARE_FLAGS_OFFSET] &= ~FIRMWARE_FW_VERIFIED_KERNEL_KEY; | |
216 break; | 214 break; |
217 | 215 |
218 default: | 216 default: |
219 return 1; | 217 return 1; |
220 } | 218 } |
221 | 219 |
222 /* Need to regenerate CRC, since the value changed. */ | 220 /* Need to regenerate CRC, since the value changed. */ |
223 context->regenerate_crc = 1; | 221 context->regenerate_crc = 1; |
224 return 0; | 222 return 0; |
225 } | 223 } |
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