blob: da4e1ca09f6d87c6bc077c7e8d96d56e6655625f (
plain)
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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 The ChromiumOS Authors. All rights reserved.
*
* 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.
*/
#include <assert.h>
#include <cbmem.h>
#include <reset.h>
#include <string.h>
#include <vb2_api.h>
#include <security/vboot/misc.h>
#include <security/vboot/symbols.h>
#include <security/vboot/vboot_common.h>
struct selected_region {
uint32_t offset;
uint32_t size;
};
/*
* this is placed at the start of the vboot work buffer. selected_region is used
* for the verstage to return the location of the selected slot. buffer is used
* by the vboot2 core. Keep the struct CPU architecture agnostic as it crosses
* stage boundaries.
*/
struct vb2_working_data {
struct selected_region selected_region;
/* offset of the buffer from the start of this struct */
uint32_t buffer_offset;
uint32_t buffer_size;
};
static const size_t vb_work_buf_size = 16 * KiB;
static struct vb2_working_data * const vboot_get_working_data(void)
{
if (IS_ENABLED(CONFIG_VBOOT_STARTS_IN_ROMSTAGE))
/* cbmem_add() does a cbmem_find() first. */
return cbmem_add(CBMEM_ID_VBOOT_WORKBUF, vb_work_buf_size);
else
return (struct vb2_working_data *)_vboot2_work;
}
static size_t vb2_working_data_size(void)
{
if (IS_ENABLED(CONFIG_VBOOT_STARTS_IN_ROMSTAGE))
return vb_work_buf_size;
else
return REGION_SIZE(vboot2_work);
}
static struct selected_region *vb2_selected_region(void)
{
struct selected_region *sel_reg = NULL;
/* Ramstage and postcar always uses cbmem as a source of truth. */
if (ENV_RAMSTAGE || ENV_POSTCAR)
sel_reg = cbmem_find(CBMEM_ID_VBOOT_SEL_REG);
else if (ENV_ROMSTAGE) {
/* Try cbmem first. Fall back on working data if not found. */
sel_reg = cbmem_find(CBMEM_ID_VBOOT_SEL_REG);
if (sel_reg == NULL) {
struct vb2_working_data *wd = vboot_get_working_data();
sel_reg = &wd->selected_region;
}
} else {
/* Stages such as bootblock and verstage use working data. */
struct vb2_working_data *wd = vboot_get_working_data();
sel_reg = &wd->selected_region;
}
return sel_reg;
}
void vb2_init_work_context(struct vb2_context *ctx)
{
struct vb2_working_data *wd;
size_t work_size;
/* First initialize the working data region. */
work_size = vb2_working_data_size();
wd = vboot_get_working_data();
memset(wd, 0, work_size);
/*
* vboot prefers 16-byte alignment. This takes away 16 bytes
* from the VBOOT2_WORK region, but the vboot devs said that's okay.
*/
wd->buffer_offset = ALIGN_UP(sizeof(*wd), 16);
wd->buffer_size = work_size - wd->buffer_offset;
/* Initialize the vb2_context. */
memset(ctx, 0, sizeof(*ctx));
ctx->workbuf = (void *)vb2_get_shared_data();
ctx->workbuf_size = wd->buffer_size;
}
struct vb2_shared_data *vb2_get_shared_data(void)
{
struct vb2_working_data *wd = vboot_get_working_data();
return (void *)((uintptr_t)wd + wd->buffer_offset);
}
int vb2_get_selected_region(struct region *region)
{
const struct selected_region *reg = vb2_selected_region();
if (reg == NULL)
return -1;
if (reg->offset == 0 && reg->size == 0)
return -1;
region->offset = reg->offset;
region->size = reg->size;
return 0;
}
void vb2_set_selected_region(const struct region *region)
{
struct selected_region *reg = vb2_selected_region();
assert(reg != NULL);
reg->offset = region_offset(region);
reg->size = region_sz(region);
}
int vb2_is_slot_selected(void)
{
const struct selected_region *reg = vb2_selected_region();
assert(reg != NULL);
return reg->size > 0;
}
void vb2_store_selected_region(void)
{
const struct vb2_working_data *wd;
struct selected_region *sel_reg;
/* Always use the working data in this path since it's the object
* which has the result.. */
wd = vboot_get_working_data();
sel_reg = cbmem_add(CBMEM_ID_VBOOT_SEL_REG, sizeof(*sel_reg));
assert(sel_reg != NULL);
sel_reg->offset = wd->selected_region.offset;
sel_reg->size = wd->selected_region.size;
}
/*
* For platforms that employ VBOOT_STARTS_IN_ROMSTAGE, the vboot
* verification doesn't happen until after cbmem is brought online.
* Therefore, the selected region contents would not be initialized
* so don't automatically add results when cbmem comes online.
*/
#if !IS_ENABLED(CONFIG_VBOOT_STARTS_IN_ROMSTAGE)
static void vb2_store_selected_region_cbmem(int unused)
{
vb2_store_selected_region();
}
ROMSTAGE_CBMEM_INIT_HOOK(vb2_store_selected_region_cbmem)
#endif
|
