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/*
* This file is part of the coreboot project.
*
* Copyright 2014 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 <arch/stages.h>
#include <cbfs.h>
#include <console/console.h>
#include <string.h>
#include "chromeos.h"
static struct vb2_working_data *init_vb2_working_data(void)
{
struct vb2_working_data *wd;
wd = vboot_get_working_data();
memset(wd, 0, CONFIG_VBOOT_WORK_BUFFER_SIZE);
/* 8-byte alignment for ARMv7 */
wd->buffer = ALIGN_UP((uintptr_t)&wd[1], 8);
wd->buffer_size = CONFIG_VBOOT_WORK_BUFFER_SIZE + (uintptr_t)wd
- (uintptr_t)wd->buffer;
return wd;
}
/**
* Verify a slot and jump to the next stage
*
* This could be either part of the (1) bootblock or the (2) verstage, depending
* on CONFIG_RETURN_FROM_VERSTAGE.
*
* 1) It jumps to the verstage and comes back, then, loads the romstage over the
* verstage space and exits to it. (note the cbfs cache is trashed on return
* from the verstage.)
*
* 2) We're already in the verstage. Verify firmware, then load the romstage and
* exits to it.
*/
void vboot2_verify_firmware(void)
{
void *entry;
struct vb2_working_data *wd;
wd = init_vb2_working_data();
#if CONFIG_RETURN_FROM_VERSTAGE
/* load verstage from RO */
entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
CONFIG_CBFS_PREFIX "/verstage");
if (entry == (void *)-1)
die("failed to load verstage");
/* verify and select a slot */
stage_exit(entry);
#else
verstage_main();
#endif /* CONFIG_RETURN_FROM_VERSTAGE */
/* jump to the selected slot */
entry = NULL;
if (vboot_is_slot_selected(wd)) {
/* RW A or B */
struct vboot_region fw_main;
struct vboot_components *fw_info;
vb2_get_selected_region(wd, &fw_main);
fw_info = vboot_locate_components(&fw_main);
if (fw_info == NULL)
die("failed to locate firmware components\n");
entry = vboot_load_stage(CONFIG_VBOOT_ROMSTAGE_INDEX,
&fw_main, fw_info);
} else if (vboot_is_readonly_path(wd)) {
/* RO */
entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
CONFIG_CBFS_PREFIX "/romstage");
}
if (entry != NULL && entry != (void *)-1)
stage_exit(entry);
die("failed to exit from stage\n");
}
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