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/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* High-level firmware wrapper API - entry points for init, firmware selection
*/
#include "gbb_header.h"
#include "load_firmware_fw.h"
#include "rollback_index.h"
#include "tpm_bootmode.h"
#include "utility.h"
#include "vboot_api.h"
#include "vboot_common.h"
#include "vboot_nvstorage.h"
/* Set recovery request */
static void VbSfRequestRecovery(VbNvContext *vnc, uint32_t recovery_request) {
VBDEBUG(("VbSfRequestRecovery(%d)\n", (int)recovery_request));
VbNvSet(vnc, VBNV_RECOVERY_REQUEST, recovery_request);
}
VbError_t VbSelectFirmware(VbCommonParams* cparams,
VbSelectFirmwareParams* fparams) {
VbSharedDataHeader* shared = (VbSharedDataHeader*)cparams->shared_data_blob;
VbNvContext vnc;
VbError_t retval = VBERROR_UNKNOWN; /* Assume error until proven successful */
int is_rec = (shared->recovery_reason ? 1 : 0);
int is_dev = (shared->flags & VBSD_BOOT_DEV_SWITCH_ON ? 1 : 0);
uint32_t tpm_version = 0;
uint32_t tpm_status = 0;
/* Start timer */
shared->timer_vb_select_firmware_enter = VbExGetTimer();
/* Load NV storage */
VbExNvStorageRead(vnc.raw);
VbNvSetup(&vnc);
/* Initialize the TPM */
VBPERFSTART("VB_TPMI");
tpm_status = RollbackFirmwareSetup(is_rec, is_dev, &tpm_version);
VBPERFEND("VB_TPMI");
if (0 != tpm_status) {
VBDEBUG(("Unable to setup TPM and read firmware version.\n"));
if (TPM_E_MUST_REBOOT == tpm_status) {
/* TPM wants to reboot into the same mode we're in now */
VBDEBUG(("TPM requires a reboot.\n"));
if (!is_rec) {
/* Not recovery mode. Just reboot (not into recovery). */
retval = VBERROR_TPM_REBOOT_REQUIRED;
goto VbSelectFirmware_exit;
} else if (VBNV_RECOVERY_RO_TPM_REBOOT != shared->recovery_reason) {
/* In recovery mode now, and we haven't requested a TPM reboot yet,
* so request one. */
VbSfRequestRecovery(&vnc, VBNV_RECOVERY_RO_TPM_REBOOT);
retval = VBERROR_TPM_REBOOT_REQUIRED;
goto VbSelectFirmware_exit;
}
}
if (!is_rec) {
VbSfRequestRecovery(&vnc, VBNV_RECOVERY_RO_TPM_ERROR);
retval = VBERROR_TPM_FIRMWARE_SETUP;
goto VbSelectFirmware_exit;
}
}
shared->fw_version_tpm_start = tpm_version;
shared->fw_version_tpm = tpm_version;
if (is_rec) {
/* Recovery is requested; go straight to recovery without checking the
* RW firmware. */
VBDEBUG(("VbSelectFirmware() detected recovery request, reason=%d.\n",
(int)shared->recovery_reason));
/* Go directly to recovery mode */
fparams->selected_firmware = VB_SELECT_FIRMWARE_RECOVERY;
} else {
/* Chain to LoadFirmware() */
retval = LoadFirmware(cparams, fparams, &vnc);
/* Exit if we failed to find an acceptable firmware */
if (VBERROR_SUCCESS != retval)
goto VbSelectFirmware_exit;
/* Translate the selected firmware path */
if (shared->flags & VBSD_LF_USE_RO_NORMAL) {
/* Request the read-only normal/dev code path */
fparams->selected_firmware = VB_SELECT_FIRMWARE_READONLY;
} else if (0 == shared->firmware_index)
fparams->selected_firmware = VB_SELECT_FIRMWARE_A;
else
fparams->selected_firmware = VB_SELECT_FIRMWARE_B;
/* Update TPM if necessary */
if (shared->fw_version_tpm_start < shared->fw_version_tpm) {
VBPERFSTART("VB_TPMU");
tpm_status = RollbackFirmwareWrite(shared->fw_version_tpm);
VBPERFEND("VB_TPMU");
if (0 != tpm_status) {
VBDEBUG(("Unable to write firmware version to TPM.\n"));
VbSfRequestRecovery(&vnc, VBNV_RECOVERY_RO_TPM_ERROR);
retval = VBERROR_TPM_WRITE_FIRMWARE;
goto VbSelectFirmware_exit;
}
}
/* Lock firmware versions in TPM */
VBPERFSTART("VB_TPML");
tpm_status = RollbackFirmwareLock();
VBPERFEND("VB_TPML");
if (0 != tpm_status) {
VBDEBUG(("Unable to lock firmware version in TPM.\n"));
VbSfRequestRecovery(&vnc, VBNV_RECOVERY_RO_TPM_ERROR);
retval = VBERROR_TPM_LOCK_FIRMWARE;
goto VbSelectFirmware_exit;
}
}
/* At this point, we have a good idea of how we are going to
* boot. Update the TPM with this state information. */
tpm_status = SetTPMBootModeState(is_dev, is_rec, shared->fw_keyblock_flags);
if (0 != tpm_status) {
VBDEBUG(("Unable to update the TPM with boot mode information.\n"));
if (!is_rec) {
VbSfRequestRecovery(&vnc, VBNV_RECOVERY_RO_TPM_ERROR);
retval = VBERROR_TPM_SET_BOOT_MODE_STATE;
goto VbSelectFirmware_exit;
}
}
/* Success! */
retval = VBERROR_SUCCESS;
VbSelectFirmware_exit:
/* Save NV storage */
VbNvTeardown(&vnc);
if (vnc.raw_changed)
VbExNvStorageWrite(vnc.raw);
/* Stop timer */
shared->timer_vb_select_firmware_exit = VbExGetTimer();
/* Should always have a known error code */
VbAssert(VBERROR_UNKNOWN != retval);
return retval;
}
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