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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* High-level firmware wrapper API - entry points for init, firmware selection
*/
#include "gbb_header.h"
#include "load_firmware_fw.h"
#include "rollback_index.h"
#include "utility.h"
#include "vboot_api.h"
#include "vboot_common.h"
#include "vboot_nvstorage.h"
VbError_t VbInit(VbCommonParams* cparams, VbInitParams* iparams) {
VbSharedDataHeader* shared = (VbSharedDataHeader*)cparams->shared_data_blob;
GoogleBinaryBlockHeader* gbb = (GoogleBinaryBlockHeader*)cparams->gbb_data;
VbNvContext vnc;
VbError_t retval = VBERROR_SUCCESS;
uint32_t recovery = VBNV_RECOVERY_NOT_REQUESTED;
int is_s3_resume = 0;
uint32_t s3_debug_boot = 0;
uint32_t require_official_os = 0;
uint32_t tpm_version = 0;
uint32_t tpm_status = 0;
int has_virt_dev_switch = 0;
int is_hw_dev = 0;
int is_virt_dev = 0;
uint32_t disable_dev_request = 0;
int is_dev = 0;
VBDEBUG(("VbInit() input flags 0x%x\n", iparams->flags));
/* Initialize output flags */
iparams->out_flags = 0;
/* Set up NV storage */
VbExNvStorageRead(vnc.raw);
VbNvSetup(&vnc);
/* Initialize shared data structure */
if (0 != VbSharedDataInit(shared, cparams->shared_data_size)) {
VBDEBUG(("Shared data init error\n"));
return VBERROR_INIT_SHARED_DATA;
}
shared->timer_vb_init_enter = VbExGetTimer();
/* Copy some boot switch flags */
shared->flags = 0;
if (iparams->flags & VB_INIT_FLAG_REC_BUTTON_PRESSED)
shared->flags |= VBSD_BOOT_REC_SWITCH_ON;
if (iparams->flags & VB_INIT_FLAG_WP_ENABLED)
shared->flags |= VBSD_BOOT_FIRMWARE_WP_ENABLED;
if (iparams->flags & VB_INIT_FLAG_S3_RESUME)
shared->flags |= VBSD_BOOT_S3_RESUME;
if (iparams->flags & VB_INIT_FLAG_RO_NORMAL_SUPPORT)
shared->flags |= VBSD_BOOT_RO_NORMAL_SUPPORT;
if (iparams->flags & VB_INIT_FLAG_OPROM_LOADED)
shared->flags |= VBSD_BOOT_OPROM_LOADED;
is_s3_resume = (iparams->flags & VB_INIT_FLAG_S3_RESUME ? 1 : 0);
/* Check if the OS is requesting a debug S3 reset */
VbNvGet(&vnc, VBNV_DEBUG_RESET_MODE, &s3_debug_boot);
if (s3_debug_boot) {
if (is_s3_resume) {
VBDEBUG(("VbInit() requesting S3 debug boot\n"));
iparams->out_flags |= VB_INIT_OUT_S3_DEBUG_BOOT;
is_s3_resume = 0; /* Proceed as if this is a normal boot */
}
/* Clear the request even if this is a normal boot, since we don't
* want the NEXT S3 resume to be a debug reset unless the OS
* asserts the request again. */
VbNvSet(&vnc, VBNV_DEBUG_RESET_MODE, 0);
}
/* If this isn't a S3 resume, read the current recovery request, then clear
* it so we don't get stuck in recovery mode. */
if (!is_s3_resume) {
VbNvGet(&vnc, VBNV_RECOVERY_REQUEST, &recovery);
VBDEBUG(("VbInit sees recovery request = %d\n", recovery));
if (VBNV_RECOVERY_NOT_REQUESTED != recovery)
VbNvSet(&vnc, VBNV_RECOVERY_REQUEST, VBNV_RECOVERY_NOT_REQUESTED);
}
/* If the previous boot failed in the firmware somewhere outside of verified
* boot, and recovery is not requested for our own reasons, request recovery
* mode. This gives the calling firmware a way to request recovery if it
* finds something terribly wrong. */
if (VBNV_RECOVERY_NOT_REQUESTED == recovery &&
iparams->flags & VB_INIT_FLAG_PREVIOUS_BOOT_FAIL) {
recovery = VBNV_RECOVERY_RO_FIRMWARE;
}
/* If recovery button is pressed, override recovery reason. Note that we
* do this in the S3 resume path also. */
if (iparams->flags & VB_INIT_FLAG_REC_BUTTON_PRESSED)
recovery = VBNV_RECOVERY_RO_MANUAL;
/* Copy current recovery reason to shared data. If we fail later on, it
* won't matter, since we'll just reboot. */
shared->recovery_reason = (uint8_t)recovery;
VBDEBUG(("VbInit now sets shared->recovery_reason = %d\n", recovery));
/* If this is a S3 resume, resume the TPM. */
/* FIXME: I think U-Boot won't ever ask us to do this. Can we remove it? */
if (is_s3_resume) {
if (TPM_SUCCESS != RollbackS3Resume()) {
/* If we can't resume, just do a full reboot. No need to go to recovery
* mode here, since if the TPM is really broken we'll catch it on the
* next boot. */
retval = VBERROR_TPM_S3_RESUME;
}
} else {
/* Should we pay attention to the TPM's virtual dev-switch? */
if (iparams->flags & VB_INIT_FLAG_VIRTUAL_DEV_SWITCH) {
shared->flags |= VBSD_HONOR_VIRT_DEV_SWITCH;
has_virt_dev_switch = 1;
}
/* We always believe the HW dev-switch, since there's one attached to servo
* which may be active even on systems without a physical switch. The EC
* may also implement a fake dev-switch for testing. */
if (iparams->flags & VB_INIT_FLAG_DEV_SWITCH_ON)
is_hw_dev = 1;
/* We may be asked to clear the virtual dev-switch at boot. */
VbNvGet(&vnc, VBNV_DISABLE_DEV_REQUEST, &disable_dev_request);
/* Allow GBB flag to override dev switch */
if (gbb->flags & GBB_FLAG_FORCE_DEV_SWITCH_ON)
is_hw_dev = 1;
VBPERFSTART("VB_TPMI");
/* Initialize the TPM. If the developer mode state has changed since the
* last boot, we need to clear TPM ownership. If the TPM space is
* initialized by this call, the virtual dev-switch will be disabled by
* default) */
tpm_status = RollbackFirmwareSetup(recovery, is_hw_dev, disable_dev_request,
/* two outputs on success */
&is_virt_dev, &tpm_version);
VBPERFEND("VB_TPMI");
if (0 != tpm_status) {
VBDEBUG(("Unable to setup TPM and read firmware version.\n"));
if (TPM_E_MUST_REBOOT == tpm_status) {
/* TPM wants to reboot into the same mode we're in now */
VBDEBUG(("TPM requires a reboot.\n"));
if (!recovery) {
/* Not recovery mode. Just reboot (not into recovery). */
retval = VBERROR_TPM_REBOOT_REQUIRED;
goto VbInit_exit;
} else if (VBNV_RECOVERY_RO_TPM_REBOOT != shared->recovery_reason) {
/* In recovery mode now, and we haven't requested a TPM reboot yet,
* so request one. */
VbNvSet(&vnc, VBNV_RECOVERY_REQUEST, VBNV_RECOVERY_RO_TPM_REBOOT);
retval = VBERROR_TPM_REBOOT_REQUIRED;
goto VbInit_exit;
}
}
if (!recovery) {
VbNvSet(&vnc, VBNV_RECOVERY_REQUEST, VBNV_RECOVERY_RO_TPM_ERROR);
retval = VBERROR_TPM_FIRMWARE_SETUP;
goto VbInit_exit;
}
}
/* TPM setup succeeded. What did we learn? */
shared->fw_version_tpm_start = tpm_version;
shared->fw_version_tpm = tpm_version;
if (is_hw_dev || (has_virt_dev_switch && is_virt_dev)) {
is_dev = 1;
shared->flags |= VBSD_BOOT_DEV_SWITCH_ON;
}
if (disable_dev_request && !is_virt_dev)
VbNvSet(&vnc, VBNV_DISABLE_DEV_REQUEST, 0);
}
/* Allow BIOS to load arbitrary option ROMs? */
if (gbb->flags & GBB_FLAG_LOAD_OPTION_ROMS)
iparams->out_flags |= VB_INIT_OUT_ENABLE_OPROM;
/* The factory may need to boot custom OSes whenever the dev-switch is on */
if (is_dev && (gbb->flags & GBB_FLAG_ENABLE_ALTERNATE_OS))
iparams->out_flags |= VB_INIT_OUT_ENABLE_ALTERNATE_OS;
/* Set output flags */
if (VBNV_RECOVERY_NOT_REQUESTED != recovery) {
/* Requesting recovery mode */
iparams->out_flags |= (VB_INIT_OUT_ENABLE_RECOVERY |
VB_INIT_OUT_CLEAR_RAM |
VB_INIT_OUT_ENABLE_DISPLAY |
VB_INIT_OUT_ENABLE_USB_STORAGE);
}
else if (is_dev) {
/* Developer switch is on, so need to support dev mode */
iparams->out_flags |= (VB_INIT_OUT_CLEAR_RAM |
VB_INIT_OUT_ENABLE_DISPLAY |
VB_INIT_OUT_ENABLE_USB_STORAGE);
/* ... which may or may not include custom OSes */
VbNvGet(&vnc, VBNV_DEV_BOOT_SIGNED_ONLY, &require_official_os);
if (!require_official_os)
iparams->out_flags |= VB_INIT_OUT_ENABLE_ALTERNATE_OS;
} else {
/* Normal mode, so disable dev_boot_* flags. This ensures they will be
* initially disabled if the user later transitions back into developer
* mode. */
VbNvSet(&vnc, VBNV_DEV_BOOT_USB, 0);
VbNvSet(&vnc, VBNV_DEV_BOOT_SIGNED_ONLY, 0);
}
VbInit_exit:
/* Tear down NV storage */
VbNvTeardown(&vnc);
if (vnc.raw_changed)
VbExNvStorageWrite(vnc.raw);
VBDEBUG(("VbInit() output flags 0x%x\n", iparams->out_flags));
shared->timer_vb_init_exit = VbExGetTimer();
VBDEBUG(("VbInit() returning 0x%x\n", retval));
return retval;
}
|