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3dcf9dce04
Also includes part of LoadKernel(), which I'll split into a separate CL. With some hacks, gets into VerifyKernel() before dying because I'm not passing in the right key blob. cgptlib is now pretty stable, and worth looking at. LoadKernel() less so. Thanks, Randall Review URL: http://codereview.chromium.org/2438005
112 lines
4.3 KiB
C
112 lines
4.3 KiB
C
/* Copyright (c) 2010 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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#ifndef VBOOT_REFERENCE_CGPTLIB_H_
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#define VBOOT_REFERENCE_CGPTLIB_H_
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#include <stdint.h>
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enum {
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GPT_SUCCESS = 0,
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GPT_ERROR_NO_VALID_KERNEL,
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GPT_ERROR_INVALID_HEADERS,
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GPT_ERROR_INVALID_ENTRIES,
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GPT_ERROR_INVALID_SECTOR_SIZE,
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GPT_ERROR_INVALID_SECTOR_NUMBER,
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GPT_ERROR_INVALID_UPDATE_TYPE,
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};
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/* Bit masks for GptData.modified field. */
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#define GPT_MODIFIED_HEADER1 0x01
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#define GPT_MODIFIED_HEADER2 0x02
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#define GPT_MODIFIED_ENTRIES1 0x04
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#define GPT_MODIFIED_ENTRIES2 0x08
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/* The 'update_type' of GptUpdateKernelEntry()
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* We expose TRY and BAD only because those are what verified boot needs.
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* For more precise control on GPT attribute bits, please refer to
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* gpt_internal.h */
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enum {
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GPT_UPDATE_ENTRY_TRY = 1,
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/* System will be trying to boot the currently selected kernel partition.
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* Update its try count if necessary. */
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GPT_UPDATE_ENTRY_BAD = 2,
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/* The currently selected kernel partition failed validation. Mark entry as
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* invalid. */
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};
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typedef struct {
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/* Fill in the following fields before calling GptInit() */
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uint8_t *primary_header; /* GPT primary header, from sector 1 of disk
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* (size: 512 bytes) */
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uint8_t *secondary_header; /* GPT secondary header, from last sector of
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* disk (size: 512 bytes) */
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uint8_t *primary_entries; /* primary GPT table, follows primary header
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* (size: 16 KB) */
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uint8_t *secondary_entries; /* secondary GPT table, precedes secondary
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* header (size: 16 KB) */
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uint32_t sector_bytes; /* Size of a LBA sector, in bytes */
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uint64_t drive_sectors; /* Size of drive in LBA sectors, in sectors */
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/* Outputs */
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uint8_t modified; /* Which inputs have been modified?
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* 0x01 = header1
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* 0x02 = header2
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* 0x04 = table1
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* 0x08 = table2 */
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int current_kernel; /* the current chromeos kernel index in partition table.
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* -1 means not found on drive. */
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/* Internal variables */
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uint32_t valid_headers, valid_entries;
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int current_priority;
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} GptData;
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int GptInit(GptData* gpt);
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/* Initializes the GPT data structure's internal state. The following fields
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* must be filled before calling this function:
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*
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* primary_header
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* secondary_header
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* primary_entries
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* secondary_entries
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* sector_bytes
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* drive_sectors
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*
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* On return the modified field may be set, if the GPT data has been modified
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* and should be written to disk.
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*
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* Returns GPT_SUCCESS if successful, non-zero if error:
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* GPT_ERROR_INVALID_HEADERS, both partition table headers are invalid, enters
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* recovery mode,
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* GPT_ERROR_INVALID_ENTRIES, both partition table entries are invalid, enters
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* recovery mode,
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* GPT_ERROR_INVALID_SECTOR_SIZE, size of a sector is not supported,
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* GPT_ERROR_INVALID_SECTOR_NUMBER, number of sectors in drive is invalid (too
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* small) */
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int GptNextKernelEntry(GptData* gpt, uint64_t* start_sector, uint64_t* size);
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/* Provides the location of the next kernel partition, in order of decreasing
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* priority. On return the start_sector parameter contains the LBA sector
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* for the start of the kernel partition, and the size parameter contains the
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* size of the kernel partition in LBA sectors. gpt.current_kernel contains
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* the partition index of the current chromeos kernel partition.
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*
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* Returns GPT_SUCCESS if successful, else
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* GPT_ERROR_NO_VALID_KERNEL, no avaliable kernel, enters recovery mode */
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int GptUpdateKernelEntry(GptData* gpt, uint32_t update_type);
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/* Updates the kernel entry with the specified index, using the specified type
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* of update (GPT_UPDATE_ENTRY_*).
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*
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* On return the modified field may be set, if the GPT data has been modified
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* and should be written to disk.
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*
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* Returns GPT_SUCCESS if successful, else
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* GPT_ERROR_INVALID_UPDATE_TYPE, invalid 'update_type' is given.
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*/
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#endif /* VBOOT_REFERENCE_CGPTLIB_H_ */
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