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91 lines
3.5 KiB
C
91 lines
3.5 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_CGPT_H_
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#define VBOOT_REFERENCE_CGPT_H_
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#include <stdint.h>
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enum {
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GPT_ERROR_NO_VALID_KERNEL = 1,
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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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};
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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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#define 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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#define 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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struct GPTData {
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/* Fill in the following fields before calling GPTInit() */
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uint8_t *header1; /* GPT primary header, from sector 1 of disk
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* (size: 512 bytes) */
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uint8_t *header2; /* GPT secondary header, from last sector of
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* disk (size: 512 bytes) */
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uint8_t *entries1; /* primary GPT table, follows primary header
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* (size: 16 KB) */
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uint8_t *entries2; /* 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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/* Internal state */
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uint8_t current_kernel; // the current kernel index
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};
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typedef struct GPTData GPTData_t;
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int GPTInit(GPTData_t *gpt);
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/* Initializes the GPT data structure's internal state. The header1, header2,
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* table1, table2, and drive_size fields should be filled in first.
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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 0 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_t *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.
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*
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* Returns 0 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_t *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 0 if successful, 1 if error. */
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#endif /* VBOOT_REFERENCE_CGPT_H_ */
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