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https://github.com/Telecominfraproject/OpenCellular.git
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1d3c804b6b
At present reading data from storage in Vboot is a little fragmented. For the firmware image, we expect the boot loader to handle this. For the disk we have a block-level API. For the GBB (which also sits in the firmware image) we expect the entire thing to be read before Vboot is called. Add the concept of a region, and an API to read from a region. At present, and most pressing, is reading from a GBB region. In the future this could be extended to other parts of the firmware or even the disk. Move all access to the GBB into this API so that the boot loader can provide either a GBB region in one large contiguous chunk, or a function to deal with read requests from vboot. The call to VbExRegionRead() is behind a flag since not all boot loaders support it yet. The main change for boot loaders which don't support this new API is that vboot will do more behind the scenes. For example, it will allocate memory for chunks of data that it reads from the GBB, rather than just accessing it directly. This approach is considerably simpler than trying to pass char ** everywhere and have vboot decide whether something needs to be allocated or not. The tests are updated, mainly to include setting up a GBB structure accessible from VbCommonParams, which is now required by the firmware and kernel functions. In normal operation this is set up at the start of VbLoadFIrmware() and VbSelectAndLoadKernel() but for tests which call children of these functions directly, the GBB structure must be set up manually by the test. BUG=chrome-os-partner:21115 BRANCH=none TEST=manual FEATURES=test sudo -E emerge vboot_reference Change-Id: I2c19e9dc2ed602d0642bbf4f7d27f79fe9fad873 Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/63336 Reviewed-by: Randall Spangler <rspangler@chromium.org>
137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* High-level firmware wrapper API - entry points for init, firmware selection
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*/
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#include "sysincludes.h"
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#include "gbb_access.h"
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#include "gbb_header.h"
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#include "load_firmware_fw.h"
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#include "rollback_index.h"
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#include "tpm_bootmode.h"
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#include "utility.h"
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#include "vboot_api.h"
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#include "vboot_common.h"
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#include "vboot_nvstorage.h"
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VbError_t VbSelectFirmware(VbCommonParams *cparams,
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VbSelectFirmwareParams *fparams)
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{
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VbSharedDataHeader *shared =
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(VbSharedDataHeader *)cparams->shared_data_blob;
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VbNvContext vnc;
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VbError_t retval = VBERROR_UNKNOWN; /* Default to error */
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int is_rec = (shared->recovery_reason ? 1 : 0);
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int is_dev = (shared->flags & VBSD_BOOT_DEV_SWITCH_ON ? 1 : 0);
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uint32_t tpm_status = 0;
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cparams->gbb = NULL;
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cparams->bmp = NULL;
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/* Start timer */
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shared->timer_vb_select_firmware_enter = VbExGetTimer();
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/* Load NV storage */
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VbExNvStorageRead(vnc.raw);
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VbNvSetup(&vnc);
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if (is_rec) {
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/*
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* Recovery is requested; go straight to recovery without
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* checking the RW firmware.
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*/
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VBDEBUG(("VbSelectFirmware() detected recovery request\n"));
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/* Go directly to recovery mode */
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fparams->selected_firmware = VB_SELECT_FIRMWARE_RECOVERY;
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} else {
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cparams->gbb = VbExMalloc(sizeof(*cparams->gbb));
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retval = VbGbbReadHeader_static(cparams, cparams->gbb);
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if (VBERROR_SUCCESS != retval)
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goto VbSelectFirmware_exit;
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/* Chain to LoadFirmware() */
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retval = LoadFirmware(cparams, fparams, &vnc);
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/* Exit if we failed to find an acceptable firmware */
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if (VBERROR_SUCCESS != retval)
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goto VbSelectFirmware_exit;
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/* Translate the selected firmware path */
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if (shared->flags & VBSD_LF_USE_RO_NORMAL) {
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/* Request the read-only normal/dev code path */
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fparams->selected_firmware =
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VB_SELECT_FIRMWARE_READONLY;
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} else if (0 == shared->firmware_index)
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fparams->selected_firmware = VB_SELECT_FIRMWARE_A;
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else {
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fparams->selected_firmware = VB_SELECT_FIRMWARE_B;
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}
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/* Update TPM if necessary */
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if (shared->fw_version_tpm_start < shared->fw_version_tpm) {
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tpm_status =
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RollbackFirmwareWrite(shared->fw_version_tpm);
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if (0 != tpm_status) {
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VBDEBUG(("Can't write FW version to TPM.\n"));
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VbNvSet(&vnc, VBNV_RECOVERY_REQUEST,
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VBNV_RECOVERY_RO_TPM_W_ERROR);
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retval = VBERROR_TPM_WRITE_FIRMWARE;
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goto VbSelectFirmware_exit;
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}
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}
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/* Lock firmware versions in TPM */
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tpm_status = RollbackFirmwareLock();
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if (0 != tpm_status) {
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VBDEBUG(("Unable to lock firmware version in TPM.\n"));
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VbNvSet(&vnc, VBNV_RECOVERY_REQUEST,
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VBNV_RECOVERY_RO_TPM_L_ERROR);
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retval = VBERROR_TPM_LOCK_FIRMWARE;
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goto VbSelectFirmware_exit;
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}
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}
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/*
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* At this point, we have a good idea of how we are going to
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* boot. Update the TPM with this state information.
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*/
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tpm_status = SetTPMBootModeState(is_dev, is_rec,
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shared->fw_keyblock_flags);
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if (0 != tpm_status) {
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VBDEBUG(("Can't update the TPM with boot mode information.\n"));
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if (!is_rec) {
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VbNvSet(&vnc, VBNV_RECOVERY_REQUEST,
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VBNV_RECOVERY_RO_TPM_U_ERROR);
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retval = VBERROR_TPM_SET_BOOT_MODE_STATE;
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goto VbSelectFirmware_exit;
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}
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}
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/* Success! */
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retval = VBERROR_SUCCESS;
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VbSelectFirmware_exit:
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if (cparams->gbb) {
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VbExFree(cparams->gbb);
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cparams->gbb = NULL;
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}
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/* Save NV storage */
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VbNvTeardown(&vnc);
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if (vnc.raw_changed)
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VbExNvStorageWrite(vnc.raw);
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/* Stop timer */
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shared->timer_vb_select_firmware_exit = VbExGetTimer();
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/* Should always have a known error code */
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VbAssert(VBERROR_UNKNOWN != retval);
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return retval;
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}
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