| /* |
| * 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. |
| */ |
| |
| #define NEED_VB20_INTERNALS /* Peeking into vb2_shared_data */ |
| |
| #include <assert.h> |
| #include <bootmode.h> |
| #include <bootstate.h> |
| #include <cbmem.h> |
| #include <vb2_api.h> |
| #include <security/vboot/misc.h> |
| #include <security/vboot/vbnv.h> |
| #include <security/vboot/vboot_common.h> |
| |
| static int vboot_get_recovery_reason_shared_data(void) |
| { |
| struct vb2_shared_data *sd = vb2_get_sd(vboot_get_context()); |
| assert(sd); |
| return sd->recovery_reason; |
| } |
| |
| void vboot_save_recovery_reason_vbnv(void) |
| { |
| if (!CONFIG(VBOOT_SAVE_RECOVERY_REASON_ON_REBOOT)) |
| return; |
| |
| int reason = vboot_get_recovery_reason_shared_data(); |
| if (!reason) |
| return; |
| |
| set_recovery_mode_into_vbnv(reason); |
| } |
| |
| static void vboot_clear_recovery_reason_vbnv(void *unused) |
| { |
| if (!CONFIG(VBOOT_SAVE_RECOVERY_REASON_ON_REBOOT)) |
| return; |
| |
| set_recovery_mode_into_vbnv(0); |
| } |
| |
| /* |
| * Recovery reason stored in VBNV needs to be cleared before the state of VBNV |
| * is backed-up anywhere or jumping to the payload (whichever occurs |
| * first). Currently, vbnv_cmos.c backs up VBNV on POST_DEVICE. Thus, we need to |
| * make sure that the stored recovery reason is cleared off before that |
| * happens. |
| * IMPORTANT: Any reboot occurring after BS_DEV_INIT state will cause loss of |
| * recovery reason on reboot. Until now, we have seen reboots occurring on x86 |
| * only in FSP stages which run before BS_DEV_INIT. |
| */ |
| BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_EXIT, |
| vboot_clear_recovery_reason_vbnv, NULL); |
| |
| /* |
| * 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 if vboot verification is done. If yes, return the reason code from |
| * shared data. |
| * 4. 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; |
| |
| /* Identify if vboot verification is already complete. */ |
| if (vboot_logic_executed()) |
| return vboot_get_recovery_reason_shared_data(); |
| |
| return 0; |
| } |
| |
| int vboot_recovery_mode_enabled(void) |
| { |
| return !!vboot_check_recovery_request(); |
| } |
| |
| int __weak clear_recovery_mode_switch(void) |
| { |
| // Weak implementation. Nothing to do. |
| return 0; |
| } |
| |
| void __weak log_recovery_mode_switch(void) |
| { |
| // Weak implementation. Nothing to do. |
| } |
| |
| int __weak get_recovery_mode_retrain_switch(void) |
| { |
| return 0; |
| } |
| |
| int vboot_recovery_mode_memory_retrain(void) |
| { |
| return get_recovery_mode_retrain_switch(); |
| } |
| |
| int vboot_developer_mode_enabled(void) |
| { |
| return vboot_logic_executed() && |
| vboot_get_context()->flags & VB2_CONTEXT_DEVELOPER_MODE; |
| } |
| |
| #if CONFIG(VBOOT_NO_BOARD_SUPPORT) |
| /** |
| * TODO: Create flash protection interface which implements get_write_protect_state. |
| * get_recovery_mode_switch should be implemented as default function. |
| */ |
| int __weak get_write_protect_state(void) |
| { |
| return 0; |
| } |
| |
| int __weak get_recovery_mode_switch(void) |
| { |
| return 0; |
| } |
| |
| #endif |