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
|
/*
* 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 <console/console.h>
#include <stdint.h>
#include <string.h>
#include <symbols.h>
#include <vb2_api.h>
#include <security/vboot/misc.h>
#include <security/vboot/symbols.h>
#include <security/vboot/vboot_common.h>
struct vboot_working_data * const vboot_get_working_data(void)
{
struct vboot_working_data *wd = NULL;
if (cbmem_possibly_online())
wd = cbmem_find(CBMEM_ID_VBOOT_WORKBUF);
if (wd == NULL && CONFIG(VBOOT_STARTS_IN_BOOTBLOCK) &&
preram_symbols_available())
wd = (struct vboot_working_data *)_vboot2_work;
assert(wd != NULL);
return wd;
}
void vboot_init_work_context(struct vb2_context *ctx)
{
struct vboot_working_data *wd;
/* First initialize the working data region. */
wd = vboot_get_working_data();
memset(wd, 0, VB2_FIRMWARE_WORKBUF_RECOMMENDED_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 = VB2_FIRMWARE_WORKBUF_RECOMMENDED_SIZE
- wd->buffer_offset;
/* Initialize the vb2_context. */
memset(ctx, 0, sizeof(*ctx));
ctx->workbuf = (void *)vboot_get_shared_data();
ctx->workbuf_size = wd->buffer_size;
}
void vboot_finalize_work_context(struct vb2_context *ctx)
{
/*
* Shrink buffer_size so that vboot_migrate_cbmem knows how
* much of vboot_working_data needs to be copied into CBMEM
* (if applicable), and so that downstream users know how much
* of the workbuf is currently used.
*/
vboot_get_working_data()->buffer_size = ctx->workbuf_used;
}
struct vb2_shared_data *vboot_get_shared_data(void)
{
struct vboot_working_data *wd = vboot_get_working_data();
return (void *)((uintptr_t)wd + wd->buffer_offset);
}
int vboot_get_selected_region(struct region *region)
{
const struct selected_region *reg =
&vboot_get_working_data()->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 vboot_set_selected_region(const struct region *region)
{
struct selected_region *reg =
&vboot_get_working_data()->selected_region;
assert(reg != NULL);
reg->offset = region_offset(region);
reg->size = region_sz(region);
}
int vboot_is_slot_selected(void)
{
struct selected_region *reg =
&vboot_get_working_data()->selected_region;
assert(reg != NULL);
return reg->size > 0;
}
#if CONFIG(VBOOT_MIGRATE_WORKING_DATA)
/*
* For platforms that do not employ VBOOT_STARTS_IN_ROMSTAGE, vboot
* verification occurs before CBMEM is brought online, using pre-RAM.
* In order to make vboot data structures available downstream, copy
* vboot_working_data from SRAM/CAR into CBMEM on platforms where this
* memory later becomes unavailable.
*/
static void vboot_migrate_cbmem(int unused)
{
const struct vboot_working_data *wd_preram =
(struct vboot_working_data *)_vboot2_work;
size_t cbmem_size = wd_preram->buffer_offset + wd_preram->buffer_size;
struct vboot_working_data *wd_cbmem =
cbmem_add(CBMEM_ID_VBOOT_WORKBUF, cbmem_size);
assert(wd_cbmem != NULL);
printk(BIOS_DEBUG,
"VBOOT: copying vboot_working_data (%zu bytes) to CBMEM...\n",
cbmem_size);
memcpy(wd_cbmem, wd_preram, cbmem_size);
}
ROMSTAGE_CBMEM_INIT_HOOK(vboot_migrate_cbmem)
#elif CONFIG(VBOOT_STARTS_IN_ROMSTAGE)
static void vboot_setup_cbmem(int unused)
{
struct vboot_working_data *wd_cbmem =
cbmem_add(CBMEM_ID_VBOOT_WORKBUF,
VB2_FIRMWARE_WORKBUF_RECOMMENDED_SIZE);
assert(wd_cbmem != NULL);
}
ROMSTAGE_CBMEM_INIT_HOOK(vboot_setup_cbmem)
#endif
|
