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/*
* This file is part of the coreboot project.
*
* Copyright 2016 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.
*/
#include <assert.h>
#include <rules.h>
#include <string.h>
#include <vb2_api.h>
#include "misc.h"
#include "../vboot_common.h"
static int vb2_get_recovery_reason_shared_data(void)
{
/* Shared data does not exist for Ramstage and Post-CAR stage. */
if (ENV_RAMSTAGE || ENV_POSTCAR)
return 0;
struct vb2_shared_data *sd = vb2_get_shared_data();
assert(sd);
return sd->recovery_reason;
}
/*
* Returns 0 for the stages where we know that cbmem does not come online.
* Even if this function returns 1 for romstage, depending upon the point in
* bootup, cbmem might not actually be online.
*/
static int cbmem_possibly_online(void)
{
if (ENV_BOOTBLOCK)
return 0;
if (ENV_VERSTAGE && IS_ENABLED(CONFIG_VBOOT_STARTS_IN_BOOTBLOCK))
return 0;
return 1;
}
/*
* Returns 1 if vboot is being used and currently in a stage which might have
* already executed vboot verification.
*/
static int vboot_possibly_executed(void)
{
if (!IS_ENABLED(CONFIG_VBOOT_VERIFY_FIRMWARE))
return 0;
if (IS_ENABLED(CONFIG_VBOOT_STARTS_IN_BOOTBLOCK)) {
if (ENV_BOOTBLOCK && IS_ENABLED(CONFIG_SEPARATE_VERSTAGE))
return 0;
return 1;
}
if (IS_ENABLED(CONFIG_VBOOT_STARTS_IN_ROMSTAGE)) {
if (ENV_BOOTBLOCK)
return 0;
return 1;
}
return 0;
}
/*
* vb2_check_recovery_request looks up different components to identify if there
* is a recovery request and returns appropriate reason code:
* 1. Checks if recovery mode is initiated by EC. If yes, returns
* VB2_RECOVERY_RO_MANUAL.
* 2. Checks if recovery request is present in VBNV and returns the code read
* from it.
* 3. Checks recovery request in handoff for stages post-cbmem.
* 4. For non-CBMEM stages, check if vboot verification is done and look-up
* selected region to identify if vboot_refence library has requested recovery
* path. If yes, return the reason code from shared data.
* 5. If nothing applies, return 0 indicating no recovery request.
*/
int vboot_check_recovery_request(void)
{
int reason = 0;
/* EC-initiated recovery. */
if (get_recovery_mode_switch())
return VB2_RECOVERY_RO_MANUAL;
/* Recovery request in VBNV. */
if ((reason = get_recovery_mode_from_vbnv()) != 0)
return reason;
/*
* Check recovery flag in vboot_handoff for stages post CBMEM coming
* online. Since for some stages there is no way to know if cbmem has
* already come online, try looking up handoff anyways. If it fails,
* flow will fallback to looking up shared data.
*/
if (cbmem_possibly_online() &&
((reason = vboot_handoff_get_recovery_reason()) != 0))
return reason;
/*
* For stages where CBMEM might not be online, identify if vboot
* verification is already complete and no slot was selected
* i.e. recovery path was requested.
*/
if (vboot_possibly_executed() && vb2_logic_executed() &&
!vb2_is_slot_selected())
return vb2_get_recovery_reason_shared_data();
return 0;
}
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