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/*
* 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 <fmap.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>
static struct vb2_context *vboot_ctx;
static void *vboot_get_workbuf(void)
{
void *wb = NULL;
if (cbmem_possibly_online())
wb = cbmem_find(CBMEM_ID_VBOOT_WORKBUF);
if (wb == NULL && CONFIG(VBOOT_STARTS_IN_BOOTBLOCK) &&
preram_symbols_available())
wb = _vboot2_work;
assert(wb != NULL);
return wb;
}
struct vb2_context *vboot_get_context(void)
{
void *wb;
/* Return if context has already been initialized/restored. */
if (vboot_ctx)
return vboot_ctx;
wb = vboot_get_workbuf();
/* Restore context from a previous stage. */
if (vboot_logic_executed()) {
assert(vb2api_reinit(wb, &vboot_ctx) == VB2_SUCCESS);
return vboot_ctx;
}
assert(verification_should_run());
/* Initialize vb2_shared_data and friends. */
assert(vb2api_init(wb, VB2_FIRMWARE_WORKBUF_RECOMMENDED_SIZE,
&vboot_ctx) == VB2_SUCCESS);
return vboot_ctx;
}
int vboot_locate_firmware(struct vb2_context *ctx, struct region_device *fw)
{
const char *name;
if (vboot_is_firmware_slot_a(ctx))
name = "FW_MAIN_A";
else
name = "FW_MAIN_B";
int ret = fmap_locate_area_as_rdev(name, fw);
if (ret)
return ret;
/* Truncate area to the size that was actually signed by vboot. */
return rdev_chain(fw, fw, 0, vb2api_get_firmware_size(ctx));
}
static void vboot_setup_cbmem(int unused)
{
const size_t cbmem_size = VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE;
void *wb_cbmem = cbmem_add(CBMEM_ID_VBOOT_WORKBUF, cbmem_size);
assert(wb_cbmem != NULL);
/*
* For platforms where VBOOT_STARTS_IN_BOOTBLOCK, vboot verification
* occurs before CBMEM is brought online, using pre-RAM. In order to
* make vboot data structures available downstream, copy vboot workbuf
* from SRAM/CAR into CBMEM.
*/
if (CONFIG(VBOOT_STARTS_IN_BOOTBLOCK))
assert(vb2api_relocate(wb_cbmem, _vboot2_work, cbmem_size,
&vboot_ctx) == VB2_SUCCESS);
}
ROMSTAGE_CBMEM_INIT_HOOK(vboot_setup_cbmem)
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