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1005 lines
37 KiB
1005 lines
37 KiB
/* 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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/* APIs provided by firmware to vboot_reference.
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*
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* General notes:
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*
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* All verified boot functions now start with "Vb" for namespace clarity. This
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* fixes the problem where uboot and vboot both defined assert().
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*
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* Verified boot APIs to be implemented by the calling firmware and exported to
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* vboot_reference start with "VbEx".
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*
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* TODO: split this file into a vboot_entry_points.h file which contains the
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* entry points for the firmware to call vboot_reference, and a
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* vboot_firmware_exports.h which contains the APIs to be implemented by the
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* calling firmware and exported to vboot_reference.
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*/
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#ifndef VBOOT_REFERENCE_VBOOT_API_H_
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#define VBOOT_REFERENCE_VBOOT_API_H_
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#include <stdint.h>
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#include <stdlib.h>
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/*****************************************************************************/
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/* Error codes */
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/*
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* Functions which return an error all return this type. This is a 32-bit
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* value rather than an int so it's consistent across UEFI, which is 32-bit
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* during PEI and 64-bit during DXE/BDS.
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*/
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typedef uint32_t VbError_t;
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/*
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* Predefined error numbers. Success is 0. Errors are non-zero, but differ
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* between functions. For example, the TPM functions may pass through TPM
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* error codes, some of which may be recoverable.
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*/
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enum VbErrorPredefined_t {
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/* No error; function completed successfully. */
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VBERROR_SUCCESS = 0,
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/*
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* The verified boot entry points VbInit(), VbSelectFirmware(),
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* VbSelectAndLoadKernel() may return the following errors.
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*/
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/* Unknown error */
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VBERROR_UNKNOWN = 0x10000,
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/* Unable to initialize shared data */
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VBERROR_INIT_SHARED_DATA = 0x10001,
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/* Error resuming TPM during a S3 resume */
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VBERROR_TPM_S3_RESUME = 0x10002,
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/* VbSelectFirmware() failed to find a valid firmware */
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VBERROR_LOAD_FIRMWARE = 0x10003,
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/* Unable to write firmware versions to TPM */
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VBERROR_TPM_WRITE_FIRMWARE = 0x10004,
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/* Unable to lock firmware versions in TPM */
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VBERROR_TPM_LOCK_FIRMWARE = 0x10005,
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/* Unable to set boot mode state in TPM */
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VBERROR_TPM_SET_BOOT_MODE_STATE = 0x10006,
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/* TPM requires reboot */
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VBERROR_TPM_REBOOT_REQUIRED = 0x10007,
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/* Unable to set up TPM */
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VBERROR_TPM_FIRMWARE_SETUP = 0x10008,
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/* Unable to read kernel versions from TPM */
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VBERROR_TPM_READ_KERNEL = 0x10009,
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/* Attempt to load developer-only firmware with developer switch off */
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VBERROR_DEV_FIRMWARE_SWITCH_MISMATCH = 0x1000A,
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/* Unable to write kernel versions to TPM */
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VBERROR_TPM_WRITE_KERNEL = 0x1000B,
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/* Unable to lock kernel versions in TPM */
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VBERROR_TPM_LOCK_KERNEL = 0x1000C,
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/* Calling firmware requested shutdown via VbExIsShutdownRequested() */
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VBERROR_SHUTDOWN_REQUESTED = 0x1000D,
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/* Unable to find a boot device on which to look for a kernel */
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VBERROR_NO_DISK_FOUND = 0x1000E,
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/* No OS kernel found on any boot device */
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VBERROR_NO_KERNEL_FOUND = 0x1000F,
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/* All OS kernels found were invalid (corrupt, improperly signed...) */
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VBERROR_INVALID_KERNEL_FOUND = 0x10010,
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/* VbSelectAndLoadKernel() requested recovery mode */
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VBERROR_LOAD_KERNEL_RECOVERY = 0x10011,
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/* Other error inside VbSelectAndLoadKernel() */
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VBERROR_LOAD_KERNEL = 0x10012,
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/* Invalid Google binary block */
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VBERROR_INVALID_GBB = 0x10013,
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/* Invalid bitmap volume */
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VBERROR_INVALID_BMPFV = 0x10014,
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/* Invalid screen index */
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VBERROR_INVALID_SCREEN_INDEX = 0x10015,
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/* Simulated (test) error */
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VBERROR_SIMULATED = 0x10016,
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/* Invalid parameter */
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VBERROR_INVALID_PARAMETER = 0x10017,
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/* VbExBeep() can't make sounds at all */
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VBERROR_NO_SOUND = 0x10018,
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/* VbExBeep() can't make sound in the background */
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VBERROR_NO_BACKGROUND_SOUND = 0x10019,
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/* Developer has requested a BIOS shell */
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VBERROR_BIOS_SHELL_REQUESTED = 0x10020,
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/* Need VGA and don't have it, or vice-versa */
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VBERROR_VGA_OPROM_MISMATCH = 0x10021,
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/* Need EC to reboot to read-only code */
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VBERROR_EC_REBOOT_TO_RO_REQUIRED = 0x10022,
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/* Invalid region read parameters */
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VBERROR_REGION_READ_INVALID = 0x10023,
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/* Cannot read from region */
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VBERROR_REGION_READ_FAILED = 0x10024,
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/* Unsupported region type */
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VBERROR_UNSUPPORTED_REGION = 0x10025,
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/* No image present (returned from VbGbbReadImage() for missing image) */
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VBERROR_NO_IMAGE_PRESENT = 0x10026,
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/* VbExEcGetExpectedRWHash() may return the following codes */
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/* Compute expected RW hash from the EC image; BIOS doesn't have it */
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VBERROR_EC_GET_EXPECTED_HASH_FROM_IMAGE = 0x20000,
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};
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/*****************************************************************************/
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/* Main entry points from firmware into vboot_reference */
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/*
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* Minimum and recommended size of shared_data_blob in bytes. Shared data blob
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* is used to communicate data between calls to VbInit(), VbSelectFirmware(),
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* the OS. Minimum size is enough to hold all required data for verified boot
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* but may not be able to hold debug output.
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*/
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#define VB_SHARED_DATA_MIN_SIZE 3072
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#define VB_SHARED_DATA_REC_SIZE 16384
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/*
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* Data passed by firmware to VbInit(), VbSelectFirmware() and
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* VbSelectAndLoadKernel().
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*
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* Note that in UEFI, these are called by different phases in different
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* processor modes (VbInit() and VbSelectFirmware() = 32-bit PEI,
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* VbSelectAndLoadKernel() = 64-bit BDS), so the data may be at a different
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* location between calls.
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*/
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typedef struct VbCommonParams {
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/* Pointer to GBB data */
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void *gbb_data;
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/* Size of GBB data in bytes */
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uint32_t gbb_size;
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/*
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* Shared data blob for data shared between verified boot entry points.
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* This should be at least VB_SHARED_DATA_MIN_SIZE bytes long, and
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* ideally is VB_SHARED_DATA_REC_SIZE bytes long.
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*/
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/* Pointer to shared data blob buffer */
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void *shared_data_blob;
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/*
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* On input, set to size of shared data blob buffer, in bytes. On
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* output, this will contain the actual data size placed into the
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* buffer.
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*/
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uint32_t shared_data_size;
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/*
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* Internal context/data for verified boot, to maintain state during
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* calls to other API functions such as VbExHashFirmwareBody().
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* Allocated and freed inside the entry point; firmware should not look
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* at this.
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*/
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void *vboot_context;
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/*
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* Internal context/data for firmware / VbExHashFirmwareBody(). Needed
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* because the PEI phase of UEFI boot runs out of ROM and thus can't
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* modify global variables; everything needs to get passed around on
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* the stack.
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*/
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void *caller_context;
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/* For internal use of Vboot - do not examine or modify! */
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struct GoogleBinaryBlockHeader *gbb;
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struct BmpBlockHeader *bmp;
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} VbCommonParams;
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/* Flags for VbInitParams.flags */
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/* Developer switch was on at boot time. */
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#define VB_INIT_FLAG_DEV_SWITCH_ON 0x00000001
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/* Recovery button was pressed at boot time. */
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#define VB_INIT_FLAG_REC_BUTTON_PRESSED 0x00000002
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/* Hardware write protect was enabled at boot time. */
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#define VB_INIT_FLAG_WP_ENABLED 0x00000004
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/* This is a S3 resume, not a normal boot. */
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#define VB_INIT_FLAG_S3_RESUME 0x00000008
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/*
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* Previous boot attempt failed for reasons external to verified boot (RAM
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* init failure, SSD missing, etc.).
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*
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* TODO: add a field to VbInitParams which holds a reason code, and report
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* that via VbSharedData.
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*/
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#define VB_INIT_FLAG_PREVIOUS_BOOT_FAIL 0x00000010
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/*
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* Calling firmware supports read only firmware for normal/developer boot path.
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*/
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#define VB_INIT_FLAG_RO_NORMAL_SUPPORT 0x00000020
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/*
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* This platform does not have a physical dev-switch, so we must rely on a
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* virtual switch (kept in the TPM) instead. When this flag is set,
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* VB_INIT_FLAG_DEV_SWITCH_ON is ignored.
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*/
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#define VB_INIT_FLAG_VIRTUAL_DEV_SWITCH 0x00000040
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/* Set when the VGA Option ROM has been loaded already. */
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#define VB_INIT_FLAG_OPROM_LOADED 0x00000080
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/* Set if we care about the VGA Option ROM - some platforms don't. */
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#define VB_INIT_FLAG_OPROM_MATTERS 0x00000100
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/* EC on this platform supports EC software sync. */
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#define VB_INIT_FLAG_EC_SOFTWARE_SYNC 0x00000200
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/* EC on this platform is slow to update. */
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#define VB_INIT_FLAG_EC_SLOW_UPDATE 0x00000400
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/*
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* Software write protect was enabled at boot time. This is separate from the
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* HW write protect. Both must be set for flash write protection to work.
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*/
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#define VB_INIT_FLAG_SW_WP_ENABLED 0x00000800
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/*
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* This platform does not have a physical recovery switch which, when present,
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* can (and should) be used for additional physical presence checks.
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*/
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#define VB_INIT_FLAG_VIRTUAL_REC_SWITCH 0x00001000
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/* Set when we are calling VbInit() before loading Option ROMs */
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#define VB_INIT_FLAG_BEFORE_OPROM_LOAD 0x00002000
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/*
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* Output flags for VbInitParams.out_flags. Used to indicate potential boot
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* paths and configuration to the calling firmware early in the boot process,
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* so that it can properly configure itself for the capabilities subsequently
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* required by VbSelectFirmware() and VbSelectAndLoadKernel().
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*/
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/*
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* Enable recovery path. Do not rely on any rewritable data (cached RAM
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* timings, etc.). Reliable operation is more important than boot speed.
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*/
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#define VB_INIT_OUT_ENABLE_RECOVERY 0x00000001
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/* RAM must be cleared before calling VbSelectFirmware(). */
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#define VB_INIT_OUT_CLEAR_RAM 0x00000002
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/*
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* Load display drivers; VbExDisplay*() functions may be called. If this flag
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* is not present, VbExDisplay*() functions will not be called this boot.
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*/
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#define VB_INIT_OUT_ENABLE_DISPLAY 0x00000004
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/*
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* Load USB storage drivers; VbExDisk*() functions may be called with the
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* VB_DISK_FLAG_REMOVABLE flag. If this flag is not present, VbExDisk*()
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* functions will only be called for fixed disks.
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*/
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#define VB_INIT_OUT_ENABLE_USB_STORAGE 0x00000008
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/* If this is a S3 resume, do a debug reset boot instead */
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#define VB_INIT_OUT_S3_DEBUG_BOOT 0x00000010
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/* BIOS should load any PCI option ROMs it finds, not just internal video */
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#define VB_INIT_OUT_ENABLE_OPROM 0x00000020
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/* BIOS may be asked to boot something other than ChromeOS */
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#define VB_INIT_OUT_ENABLE_ALTERNATE_OS 0x00000040
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/* Enable developer path. */
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#define VB_INIT_OUT_ENABLE_DEVELOPER 0x00000080
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/* Data only used by VbInit() */
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typedef struct VbInitParams {
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/* Inputs to VbInit() */
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/* Flags (see VB_INIT_FLAG_*) */
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uint32_t flags;
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/* Outputs from VbInit(); valid only if it returns success. */
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/* Output flags for firmware; see VB_INIT_OUT_*) */
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uint32_t out_flags;
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} VbInitParams;
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/*
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* Firmware types for VbHashFirmwareBody() and
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* VbSelectFirmwareParams.selected_firmware. Note that we store these in a
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* uint32_t because enum maps to int, which isn't fixed-size.
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*/
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enum VbSelectFirmware_t {
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/* Recovery mode */
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VB_SELECT_FIRMWARE_RECOVERY = 0,
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/* Rewritable firmware A/B for normal or developer path */
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VB_SELECT_FIRMWARE_A = 1,
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VB_SELECT_FIRMWARE_B = 2,
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/* Read only firmware for normal or developer path. */
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VB_SELECT_FIRMWARE_READONLY = 3,
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VB_SELECT_FIRMWARE_COUNT,
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};
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/* Data only used by VbSelectFirmware() */
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typedef struct VbSelectFirmwareParams {
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/* Inputs to VbSelectFirmware() */
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/* Key block + preamble for firmware A */
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void *verification_block_A;
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/* Key block + preamble for firmware B */
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void *verification_block_B;
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/* Verification block A size in bytes */
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uint32_t verification_size_A;
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/* Verification block B size in bytes */
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uint32_t verification_size_B;
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/* Outputs from VbSelectFirmware(); valid only if it returns success. */
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/* Main firmware to run; see VB_SELECT_FIRMWARE_*. */
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uint32_t selected_firmware;
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} VbSelectFirmwareParams;
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/*
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* We use disk handles rather than indices. Using indices causes problems if
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* a disk is removed/inserted in the middle of processing.
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*/
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typedef void *VbExDiskHandle_t;
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/* Data used only by VbSelectAndLoadKernel() */
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typedef struct VbSelectAndLoadKernelParams {
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/* Inputs to VbSelectAndLoadKernel() */
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/* Destination buffer for kernel (normally at 0x100000 on x86) */
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void *kernel_buffer;
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/* Size of kernel buffer in bytes */
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uint32_t kernel_buffer_size;
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/*
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* Outputs from VbSelectAndLoadKernel(); valid only if it returns
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* success.
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*/
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/* Handle of disk containing loaded kernel */
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VbExDiskHandle_t disk_handle;
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/* Partition number on disk to boot (1...M) */
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uint32_t partition_number;
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/* Address of bootloader image in RAM */
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uint64_t bootloader_address;
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/* Size of bootloader image in bytes */
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uint32_t bootloader_size;
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/* UniquePartitionGuid for boot partition */
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uint8_t partition_guid[16];
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/* Flags passed in by signer */
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uint32_t flags;
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/*
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* TODO: in H2C, all that pretty much just gets passed to the
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* bootloader as KernelBootloaderOptions, though the disk handle is
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* passed as an index instead of a handle. Is that used anymore now
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* that we're passing partition_guid?
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*/
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} VbSelectAndLoadKernelParams;
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/**
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* Initialize the verified boot library.
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*
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* Returns VBERROR_SUCCESS if success, non-zero if error; on error,
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* caller should reboot.
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*/
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VbError_t VbInit(VbCommonParams *cparams, VbInitParams *iparams);
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/**
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* Select the main firmware.
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*
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* Returns VBERROR_SUCCESS if success, non-zero if error; on error,
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* caller should reboot.
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*
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* NOTE: This is now called in all modes, including recovery. Previously,
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* LoadFirmware() was not called in recovery mode, which meant that
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* LoadKernel() needed to duplicate the TPM and VbSharedData initialization
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* code.
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*/
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VbError_t VbSelectFirmware(VbCommonParams *cparams,
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VbSelectFirmwareParams *fparams);
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/**
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* Update the data hash for the current firmware image, extending it by [size]
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* bytes stored in [*data]. This function must only be called inside
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* VbExHashFirmwareBody(), which is in turn called by VbSelectFirmware().
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*/
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void VbUpdateFirmwareBodyHash(VbCommonParams *cparams,
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uint8_t *data, uint32_t size);
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/**
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* Select and loads the kernel.
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*
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* Returns VBERROR_SUCCESS if success, non-zero if error; on error, caller
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* should reboot. */
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VbError_t VbSelectAndLoadKernel(VbCommonParams *cparams,
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VbSelectAndLoadKernelParams *kparams);
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/*****************************************************************************/
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/* Debug output (from utility.h) */
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/**
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* Output an error message and quit. Does not return. Supports
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* printf()-style formatting.
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*/
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void VbExError(const char *format, ...);
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/**
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* Output a debug message. Supports printf()-style formatting.
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*/
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void VbExDebug(const char *format, ...)
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__attribute__ ((format (__printf__, 1, 2)));
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/*****************************************************************************/
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/* Memory (from utility.h) */
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/**
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* Allocate [size] bytes and return a pointer to the allocated memory. Abort
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* on error; this always either returns a good pointer or never returns.
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*
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* If any of the firmware API implementations require aligned data (for
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* example, disk access on ARM), all pointers returned by VbExMalloc() must
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* also be aligned.
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*/
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void *VbExMalloc(size_t size);
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/**
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* Free memory pointed to by [ptr] previously allocated by VbExMalloc().
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*/
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void VbExFree(void *ptr);
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/*****************************************************************************/
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/* Timer and delay (first two from utility.h) */
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/**
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* Read a high-resolution timer. Returns the current timer value in arbitrary
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* units.
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*
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* This is intended for benchmarking, so this call MUST be fast. The timer
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* frequency must be >1 KHz (preferably >1 MHz), and the timer must not wrap
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* around for at least 10 minutes. It is preferable (but not required) that
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* the timer be initialized to 0 at boot.
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*
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* It is assumed that the firmware has some other way of communicating the
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* timer frequency to the OS. For example, on x86 we use TSC, and the OS
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* kernel reports the initial TSC value at kernel-start and calculates the
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* frequency. */
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uint64_t VbExGetTimer(void);
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/**
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* Delay for at least the specified number of milliseconds. Should be accurate
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* to within 10% (a requested delay of 1000 ms should result in an actual delay
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* of between 1000 - 1100 ms).
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*/
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void VbExSleepMs(uint32_t msec);
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/**
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* Play a beep tone of the specified frequency in Hz and duration in msec.
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* This is effectively a VbSleep() variant that makes noise.
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*
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* If the audio codec can run in the background, then:
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* zero frequency means OFF, non-zero frequency means ON
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* zero msec means return immediately, non-zero msec means delay (and
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* then OFF if needed)
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* otherwise,
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* non-zero msec and non-zero frequency means ON, delay, OFF, return
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* zero msec or zero frequency means do nothing and return immediately
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*
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* The return value is used by the caller to determine the capabilities. The
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* implementation should always do the best it can if it cannot fully support
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* all features - for example, beeping at a fixed frequency if frequency
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* support is not available. At a minimum, it must delay for the specified
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* non-zero duration.
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*/
|
|
VbError_t VbExBeep(uint32_t msec, uint32_t frequency);
|
|
|
|
/*****************************************************************************/
|
|
/* TPM (from tlcl_stub.h) */
|
|
|
|
/**
|
|
* Initialize the stub library. */
|
|
VbError_t VbExTpmInit(void);
|
|
|
|
/**
|
|
* Close and open the device. This is needed for running more complex commands
|
|
* at user level, such as TPM_TakeOwnership, since the TPM device can be opened
|
|
* only by one process at a time.
|
|
*/
|
|
VbError_t VbExTpmClose(void);
|
|
VbError_t VbExTpmOpen(void);
|
|
|
|
/**
|
|
* Send a request_length-byte request to the TPM and receive a response. On
|
|
* input, response_length is the size of the response buffer in bytes. On
|
|
* exit, response_length is set to the actual received response length in
|
|
* bytes. */
|
|
VbError_t VbExTpmSendReceive(const uint8_t *request, uint32_t request_length,
|
|
uint8_t *response, uint32_t *response_length);
|
|
|
|
/*****************************************************************************/
|
|
/* Non-volatile storage */
|
|
|
|
#define VBNV_BLOCK_SIZE 16 /* Size of NV storage block in bytes */
|
|
|
|
/**
|
|
* Read the VBNV_BLOCK_SIZE-byte non-volatile storage into buf.
|
|
*/
|
|
VbError_t VbExNvStorageRead(uint8_t *buf);
|
|
|
|
/**
|
|
* Write the VBNV_BLOCK_SIZE-byte non-volatile storage from buf.
|
|
*/
|
|
VbError_t VbExNvStorageWrite(const uint8_t *buf);
|
|
|
|
/*****************************************************************************/
|
|
/* Firmware / EEPROM access (previously in load_firmware_fw.h) */
|
|
|
|
/**
|
|
* Calculate the hash of the firmware body data for [firmware_index], which is
|
|
* either VB_SELECT_FIRMWARE_A or VB_SELECT_FIRMWARE B.
|
|
*
|
|
* This function must call VbUpdateFirmwareBodyHash() before returning, to
|
|
* update the secure hash for the firmware image. For best performance, the
|
|
* implementation should call VbUpdateFirmwareBodyHash() periodically during
|
|
* the read, so that updating the hash can be pipelined with the read. If the
|
|
* reader cannot update the hash during the read process, it should call
|
|
* VbUpdateFirmwareBodyHash() on the entire firmware data after the read,
|
|
* before returning.
|
|
*
|
|
* It is recommended that the firmware use this call to copy the requested
|
|
* firmware body from EEPROM into RAM, so that it doesn't need to do a second
|
|
* slow copy from EEPROM to RAM if this firmware body is selected.
|
|
*
|
|
* Note this function doesn't actually pass the firmware body data to verified
|
|
* boot, because verified boot doesn't actually need the firmware body, just
|
|
* its hash. This is important on x86, where the firmware is stored
|
|
* compressed. We hash the compressed data, but the BIOS decompresses it
|
|
* during read. Simply updating a hash is compatible with the x86
|
|
* read-and-decompress pipeline.
|
|
*/
|
|
VbError_t VbExHashFirmwareBody(VbCommonParams *cparams,
|
|
uint32_t firmware_index);
|
|
|
|
/*****************************************************************************/
|
|
/* Disk access (previously in boot_device.h) */
|
|
|
|
/* Flags for VbDisk APIs */
|
|
/* Disk is removable. Example removable disks: SD cards, USB keys. */
|
|
#define VB_DISK_FLAG_REMOVABLE 0x00000001
|
|
/*
|
|
* Disk is fixed. If this flag is present, disk is internal to the system and
|
|
* not removable. Example fixed disks: internal SATA SSD, eMMC.
|
|
*/
|
|
#define VB_DISK_FLAG_FIXED 0x00000002
|
|
/*
|
|
* Note that VB_DISK_FLAG_REMOVABLE and VB_DISK_FLAG_FIXED are
|
|
* mutually-exclusive for a single disk. VbExDiskGetInfo() may specify both
|
|
* flags to request disks of both types in a single call.
|
|
*
|
|
* At some point we could specify additional flags, but we don't currently
|
|
* have a way to make use of these:
|
|
*
|
|
* USB Device is known to be attached to USB. Note that the SD
|
|
* card reader inside x86 systems is attached to USB so this
|
|
* isn't super useful.
|
|
* SD Device is known to be a SD card. Note that external card
|
|
* readers might not return this information, so also of
|
|
* questionable use.
|
|
* READ_ONLY Device is known to be read-only. Could be used by recovery
|
|
* when processing read-only recovery image.
|
|
*/
|
|
|
|
/*
|
|
* Disks are used in two ways:
|
|
* - As a random-access device to read and write the GPT
|
|
* - As a streaming device to read the kernel
|
|
* These are implemented differently on raw NAND vs eMMC/SATA/USB
|
|
* - On eMMC/SATA/USB, both of these refer to the same underlying
|
|
* storage, so they have the same size and LBA size. In this case,
|
|
* the GPT should not point to the same address as itself.
|
|
* - On raw NAND, the GPT is held on a portion of the SPI flash.
|
|
* Random access GPT operations refer to the SPI and streaming
|
|
* operations refer to NAND. The GPT may therefore point into
|
|
* the same offsets as itself.
|
|
* These types are distinguished by the following flag and VbDiskInfo
|
|
* has separate fields to describe the random-access ("GPT") and
|
|
* streaming aspects of the disk. If a disk is random-access (i.e.
|
|
* not raw NAND) then these fields are equal.
|
|
*/
|
|
#define VB_DISK_FLAG_EXTERNAL_GPT 0x00000004
|
|
|
|
/* Information on a single disk */
|
|
typedef struct VbDiskInfo {
|
|
/* Disk handle */
|
|
VbExDiskHandle_t handle;
|
|
/* Size of a random-access LBA sector in bytes */
|
|
uint64_t bytes_per_lba;
|
|
/* Number of random-access LBA sectors on the device.
|
|
* If streaming_lba_count is 0, this stands in for the size of the
|
|
* randomly accessed portion as well as the streaming portion.
|
|
* Otherwise, this is only the randomly-accessed portion. */
|
|
uint64_t lba_count;
|
|
/* Number of streaming sectors on the device */
|
|
uint64_t streaming_lba_count;
|
|
/* Flags (see VB_DISK_FLAG_* constants) */
|
|
uint32_t flags;
|
|
/*
|
|
* Optional name string, for use in debugging. May be empty or null if
|
|
* not available.
|
|
*/
|
|
const char *name;
|
|
} VbDiskInfo;
|
|
|
|
/**
|
|
* Store information into [info] for all disks (storage devices) attached to
|
|
* the system which match all of the disk_flags.
|
|
*
|
|
* On output, count indicates how many disks are present, and [infos_ptr]
|
|
* points to a [count]-sized array of VbDiskInfo structs with the information
|
|
* on those disks; this pointer must be freed by calling VbExDiskFreeInfo().
|
|
* If count=0, infos_ptr may point to NULL. If [infos_ptr] points to NULL
|
|
* because count=0 or error, it is not necessary to call VbExDiskFreeInfo().
|
|
*
|
|
* A multi-function device (such as a 4-in-1 card reader) should provide
|
|
* multiple disk handles.
|
|
*
|
|
* The firmware must not alter or free the list pointed to by [infos_ptr] until
|
|
* VbExDiskFreeInfo() is called.
|
|
*/
|
|
VbError_t VbExDiskGetInfo(VbDiskInfo **infos_ptr, uint32_t *count,
|
|
uint32_t disk_flags);
|
|
|
|
/**
|
|
* Free a disk information list [infos] previously returned by
|
|
* VbExDiskGetInfo(). If [preserve_handle] != NULL, the firmware must ensure
|
|
* that handle remains valid after this call; all other handles from the info
|
|
* list need not remain valid after this call.
|
|
*/
|
|
VbError_t VbExDiskFreeInfo(VbDiskInfo *infos,
|
|
VbExDiskHandle_t preserve_handle);
|
|
|
|
/**
|
|
* Read lba_count LBA sectors, starting at sector lba_start, from the disk,
|
|
* into the buffer.
|
|
*
|
|
* This is used for random access to the GPT. It is not for the partition
|
|
* contents. The upper limit is lba_count.
|
|
*
|
|
* If the disk handle is invalid (for example, the handle refers to a disk
|
|
* which as been removed), the function must return error but must not
|
|
* crash.
|
|
*/
|
|
VbError_t VbExDiskRead(VbExDiskHandle_t handle, uint64_t lba_start,
|
|
uint64_t lba_count, void *buffer);
|
|
|
|
/**
|
|
* Write lba_count LBA sectors, starting at sector lba_start, to the disk, from
|
|
* the buffer.
|
|
*
|
|
* This is used for random access to the GPT. It does not (necessarily) access
|
|
* the streaming portion of the device.
|
|
*
|
|
* If the disk handle is invalid (for example, the handle refers to a disk
|
|
* which as been removed), the function must return error but must not
|
|
* crash.
|
|
*/
|
|
VbError_t VbExDiskWrite(VbExDiskHandle_t handle, uint64_t lba_start,
|
|
uint64_t lba_count, const void *buffer);
|
|
|
|
/* Streaming read interface */
|
|
typedef void *VbExStream_t;
|
|
|
|
/**
|
|
* Open a stream on a disk
|
|
*
|
|
* @param handle Disk to open the stream against
|
|
* @param lba_start Starting sector offset within the disk to stream from
|
|
* @param lba_count Maximum extent of the stream in sectors
|
|
* @param stream out-paramter for the generated stream
|
|
*
|
|
* @return Error code, or VBERROR_SUCCESS.
|
|
*
|
|
* This is used for access to the contents of the actual partitions on the
|
|
* device. It is not used to access the GPT. The size of the content addressed
|
|
* is within streaming_lba_count.
|
|
*/
|
|
VbError_t VbExStreamOpen(VbExDiskHandle_t handle, uint64_t lba_start,
|
|
uint64_t lba_count, VbExStream_t *stream_ptr);
|
|
|
|
/**
|
|
* Read from a stream on a disk
|
|
*
|
|
* @param stream Stream to read from
|
|
* @param bytes Number of bytes to read
|
|
* @param buffer Destination to read into
|
|
*
|
|
* @return Error code, or VBERROR_SUCCESS. Failure to read as much data as
|
|
* requested is an error.
|
|
*
|
|
* This is used for access to the contents of the actual partitions on the
|
|
* device. It is not used to access the GPT.
|
|
*/
|
|
VbError_t VbExStreamRead(VbExStream_t stream, uint32_t bytes, void *buffer);
|
|
|
|
/**
|
|
* Close a stream
|
|
*
|
|
* @param stream Stream to close
|
|
*/
|
|
void VbExStreamClose(VbExStream_t stream);
|
|
|
|
|
|
/*****************************************************************************/
|
|
/* Display */
|
|
|
|
/* Predefined (default) screens for VbExDisplayScreen(). */
|
|
enum VbScreenType_t {
|
|
/* Blank (clear) screen */
|
|
VB_SCREEN_BLANK = 0,
|
|
/* Developer - warning */
|
|
VB_SCREEN_DEVELOPER_WARNING = 0x101,
|
|
/* Developer - easter egg */
|
|
VB_SCREEN_DEVELOPER_EGG = 0x102,
|
|
/* Recovery - remove inserted devices */
|
|
VB_SCREEN_RECOVERY_REMOVE = 0x201,
|
|
/* Recovery - insert recovery image */
|
|
VB_SCREEN_RECOVERY_INSERT = 0x202,
|
|
/* Recovery - inserted image invalid */
|
|
VB_SCREEN_RECOVERY_NO_GOOD = 0x203,
|
|
/* Recovery - confirm dev mode */
|
|
VB_SCREEN_RECOVERY_TO_DEV = 0x204,
|
|
/* Developer - confirm normal mode */
|
|
VB_SCREEN_DEVELOPER_TO_NORM = 0x205,
|
|
/* Please wait - programming EC */
|
|
VB_SCREEN_WAIT = 0x206,
|
|
/* Confirm after DEVELOPER_TO_NORM */
|
|
VB_SCREEN_TO_NORM_CONFIRMED = 0x207,
|
|
};
|
|
|
|
/**
|
|
* Initialize and clear the display. Set width and height to the screen
|
|
* dimensions in pixels.
|
|
*/
|
|
VbError_t VbExDisplayInit(uint32_t *width, uint32_t *height);
|
|
|
|
/**
|
|
* Enable (enable!=0) or disable (enable=0) the display backlight.
|
|
*/
|
|
VbError_t VbExDisplayBacklight(uint8_t enable);
|
|
|
|
/**
|
|
* Sets the logical dimension to display.
|
|
*
|
|
* If the physical display is larger or smaller than given dimension, display
|
|
* provider may decide to scale or shift images (from VbExDisplayImage)to proper
|
|
* location.
|
|
*/
|
|
VbError_t VbExDisplaySetDimension(uint32_t width, uint32_t height);
|
|
|
|
/**
|
|
* Display a predefined screen; see VB_SCREEN_* for valid screens.
|
|
*
|
|
* This is a backup method of screen display, intended for use if the GBB does
|
|
* not contain a full set of bitmaps. It is acceptable for the backup screen
|
|
* to be simple ASCII text such as "NO GOOD" or "INSERT"; these screens should
|
|
* only be seen during development.
|
|
*/
|
|
VbError_t VbExDisplayScreen(uint32_t screen_type);
|
|
|
|
/**
|
|
* Write an image to the display, with the upper left corner at the specified
|
|
* pixel coordinates. The bitmap buffer is a pointer to the platform-dependent
|
|
* uncompressed binary blob with dimensions and format specified internally
|
|
* (for example, a raw BMP, GIF, PNG, whatever). We pass the size just for
|
|
* convenience.
|
|
*/
|
|
VbError_t VbExDisplayImage(uint32_t x, uint32_t y,
|
|
void *buffer, uint32_t buffersize);
|
|
|
|
/**
|
|
* Display a string containing debug information on the screen, rendered in a
|
|
* platform-dependent font. Should be able to handle newlines '\n' in the
|
|
* string. Firmware must support displaying at least 20 lines of text, where
|
|
* each line may be at least 80 characters long. If the firmware has its own
|
|
* debug state, it may display it to the screen below this information.
|
|
*
|
|
* NOTE: This is what we currently display when TAB is pressed. Some
|
|
* information (HWID, recovery reason) is ours; some (CMOS breadcrumbs) is
|
|
* platform-specific. If we decide to soft-render the HWID string
|
|
* (chrome-os-partner:3693), we'll need to maintain our own fonts, so we'll
|
|
* likely display it via VbExDisplayImage() above.
|
|
*/
|
|
VbError_t VbExDisplayDebugInfo(const char *info_str);
|
|
|
|
/*****************************************************************************/
|
|
/* Keyboard and switches */
|
|
|
|
/* Key codes for required non-printable-ASCII characters. */
|
|
enum VbKeyCode_t {
|
|
VB_KEY_UP = 0x100,
|
|
VB_KEY_DOWN = 0x101,
|
|
VB_KEY_LEFT = 0x102,
|
|
VB_KEY_RIGHT = 0x103,
|
|
VB_KEY_CTRL_ENTER = 0x104,
|
|
};
|
|
|
|
/* Flags for additional information.
|
|
* TODO(semenzato): consider adding flags for modifiers instead of
|
|
* making up some of the key codes above.
|
|
*/
|
|
enum VbKeyFlags_t {
|
|
VB_KEY_FLAG_TRUSTED_KEYBOARD = 1 << 0,
|
|
};
|
|
|
|
/**
|
|
* Read the next keypress from the keyboard buffer.
|
|
*
|
|
* Returns the keypress, or zero if no keypress is pending or error.
|
|
*
|
|
* The following keys must be returned as ASCII character codes:
|
|
* 0x08 Backspace
|
|
* 0x09 Tab
|
|
* 0x0D Enter (carriage return)
|
|
* 0x01 - 0x1A Ctrl+A - Ctrl+Z (yes, those alias with backspace/tab/enter)
|
|
* 0x1B Esc
|
|
* 0x20 Space
|
|
* 0x30 - 0x39 '0' - '9'
|
|
* 0x60 - 0x7A 'a' - 'z'
|
|
*
|
|
* Some extended keys must also be supported; see the VB_KEY_* defines above.
|
|
*
|
|
* Keys ('/') or key-chords (Fn+Q) not defined above may be handled in any of
|
|
* the following ways:
|
|
* 1. Filter (don't report anything if one of these keys is pressed).
|
|
* 2. Report as ASCII (if a well-defined ASCII value exists for the key).
|
|
* 3. Report as any other value in the range 0x200 - 0x2FF.
|
|
* It is not permitted to report a key as a multi-byte code (for example,
|
|
* sending an arrow key as the sequence of keys '\x1b', '[', '1', 'A'). */
|
|
uint32_t VbExKeyboardRead(void);
|
|
|
|
/**
|
|
* Same as VbExKeyboardRead(), but return extra information.
|
|
*/
|
|
uint32_t VbExKeyboardReadWithFlags(uint32_t *flags_ptr);
|
|
|
|
/**
|
|
* Return the current state of the switches specified in request_mask
|
|
*/
|
|
uint32_t VbExGetSwitches(uint32_t request_mask);
|
|
|
|
/*****************************************************************************/
|
|
/* Embedded controller (EC) */
|
|
|
|
/*
|
|
* All these functions take a devidx parameter, which indicates which embedded
|
|
* processor the call applies to. At present, only devidx=0 is valid, but
|
|
* upcoming CLs will add support for multiple devices.
|
|
*/
|
|
|
|
/**
|
|
* This is called only if the system implements a keyboard-based (virtual)
|
|
* developer switch. It must return true only if the system has an embedded
|
|
* controller which is provably running in its RO firmware at the time the
|
|
* function is called.
|
|
*/
|
|
int VbExTrustEC(int devidx);
|
|
|
|
/**
|
|
* Check if the EC is currently running rewritable code.
|
|
*
|
|
* If the EC is in RO code, sets *in_rw=0.
|
|
* If the EC is in RW code, sets *in_rw non-zero.
|
|
* If the current EC image is unknown, returns error. */
|
|
VbError_t VbExEcRunningRW(int devidx, int *in_rw);
|
|
|
|
/**
|
|
* Request the EC jump to its rewritable code. If successful, returns when the
|
|
* EC has booting its RW code far enough to respond to subsequent commands.
|
|
* Does nothing if the EC is already in its rewritable code.
|
|
*/
|
|
VbError_t VbExEcJumpToRW(int devidx);
|
|
|
|
/**
|
|
* Tell the EC to refuse another jump until it reboots. Subsequent calls to
|
|
* VbExEcJumpToRW() in this boot will fail.
|
|
*/
|
|
VbError_t VbExEcDisableJump(int devidx);
|
|
|
|
/**
|
|
* Read the SHA-256 hash of the rewriteable EC image.
|
|
*/
|
|
VbError_t VbExEcHashRW(int devidx, const uint8_t **hash, int *hash_size);
|
|
|
|
/**
|
|
* Get the expected contents of the EC image associated with the main firmware
|
|
* specified by the "select" argument.
|
|
*/
|
|
VbError_t VbExEcGetExpectedRW(int devidx, enum VbSelectFirmware_t select,
|
|
const uint8_t **image, int *image_size);
|
|
|
|
/**
|
|
* Read the SHA-256 hash of the expected contents of the EC image associated
|
|
* with the main firmware specified by the "select" argument.
|
|
*/
|
|
VbError_t VbExEcGetExpectedRWHash(int devidx, enum VbSelectFirmware_t select,
|
|
const uint8_t **hash, int *hash_size);
|
|
|
|
/**
|
|
* Update the EC rewritable image.
|
|
*/
|
|
VbError_t VbExEcUpdateRW(int devidx, const uint8_t *image, int image_size);
|
|
|
|
/**
|
|
* Lock the EC code to prevent updates until the EC is rebooted.
|
|
* Subsequent calls to VbExEcUpdateRW() this boot will fail.
|
|
*/
|
|
VbError_t VbExEcProtectRW(int devidx);
|
|
|
|
/**
|
|
* Info the EC of the boot mode selected by the AP.
|
|
* mode: Normal, Developer, or Recovery
|
|
*/
|
|
enum VbEcBootMode_t {VB_EC_NORMAL, VB_EC_DEVELOPER, VB_EC_RECOVERY };
|
|
VbError_t VbExEcEnteringMode(int devidx, enum VbEcBootMode_t mode);
|
|
|
|
/*****************************************************************************/
|
|
/* Misc */
|
|
|
|
/* Args to VbExProtectFlash() */
|
|
enum VbProtectFlash_t { VBPROTECT_RW_A, VBPROTECT_RW_B, VBPROTECT_RW_DEVKEY };
|
|
|
|
/**
|
|
* Lock a section of the BIOS flash address space to prevent updates until the
|
|
* host is rebooted. Subsequent attempts to erase or modify the specified BIOS
|
|
* image will fail. If this function is called more than once each call should
|
|
* be cumulative.
|
|
*/
|
|
VbError_t VbExProtectFlash(enum VbProtectFlash_t region);
|
|
|
|
/**
|
|
* Check if the firmware needs to shut down the system.
|
|
*
|
|
* Returns a non-zero VB_SHUTDOWN_REQUEST mask indicating the reason(s) for
|
|
* shutdown if a shutdown is being requested (see VB_SHUTDOWN_REQUEST_*), or 0
|
|
* if a shutdown is not being requested.
|
|
*
|
|
* NOTE: When we're displaying a screen, pressing the power button should shut
|
|
* down the computer. We need a way to break out of our control loop so this
|
|
* can occur cleanly.
|
|
*/
|
|
uint32_t VbExIsShutdownRequested(void);
|
|
|
|
/*
|
|
* Shutdown requested for a reason which is not defined among other
|
|
* VB_SHUTDOWN_REQUEST_* values. This must be defined as 1 for backward
|
|
* compatibility with old versions of the API.
|
|
*/
|
|
#define VB_SHUTDOWN_REQUEST_OTHER 0x00000001
|
|
/* Shutdown requested due to a lid switch being closed. */
|
|
#define VB_SHUTDOWN_REQUEST_LID_CLOSED 0x00000002
|
|
/* Shutdown requested due to a power button being pressed. */
|
|
#define VB_SHUTDOWN_REQUEST_POWER_BUTTON 0x00000004
|
|
|
|
/**
|
|
* Expose the BIOS' built-in decompression routine to the vboot wrapper. The
|
|
* caller must know how large the uncompressed data will be and must manage
|
|
* that memory. The decompression routine just puts the uncompressed data into
|
|
* the specified buffer. We pass in the size of the outbuf, and get back the
|
|
* actual size used.
|
|
*/
|
|
VbError_t VbExDecompress(void *inbuf, uint32_t in_size,
|
|
uint32_t compression_type,
|
|
void *outbuf, uint32_t *out_size);
|
|
|
|
/* Constants for compression_type */
|
|
enum {
|
|
COMPRESS_NONE = 0,
|
|
COMPRESS_EFIv1, /* The x86 BIOS only supports this */
|
|
COMPRESS_LZMA1, /* The ARM BIOS supports LZMA1 */
|
|
MAX_COMPRESS,
|
|
};
|
|
|
|
/**
|
|
* Execute legacy boot option.
|
|
*/
|
|
int VbExLegacy(void);
|
|
|
|
/* Regions for VbExRegionRead() */
|
|
enum vb_firmware_region {
|
|
VB_REGION_GBB, /* Google Binary Block - see gbbheader.h */
|
|
|
|
VB_REGION_COUNT,
|
|
};
|
|
|
|
/**
|
|
* Read data from a region of the firmware image
|
|
*
|
|
* Vboot wants access to a region, to read data from it. This function
|
|
* reads it (typically from the firmware image such as SPI flash) and
|
|
* returns the data.
|
|
*
|
|
* cparams is passed so that the boot loader has some context for the
|
|
* operation.
|
|
*
|
|
* @param cparams Common parameters, e.g. use member caller_context
|
|
* to point to useful context data
|
|
* @param region Firmware region to read
|
|
* @param offset Start offset within region
|
|
* @param size Number of bytes to read
|
|
* @param buf Place to put data
|
|
* @return VBERROR_... error, VBERROR_SUCCESS on success,
|
|
*/
|
|
VbError_t VbExRegionRead(VbCommonParams *cparams,
|
|
enum vb_firmware_region region, uint32_t offset,
|
|
uint32_t size, void *buf);
|
|
|
|
#endif /* VBOOT_REFERENCE_VBOOT_API_H_ */
|