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cefe12c105
No code changes, just reformatting. BUG=none BRANCH=none TEST=make runtests Change-Id: Ib8748df93c64395c88e1f789805393fcfe3ac419 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/42397 Reviewed-by: Bill Richardson <wfrichar@chromium.org>
139 lines
4.3 KiB
C
139 lines
4.3 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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#ifndef VBOOT_REFERENCE_CGPTLIB_H_
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#define VBOOT_REFERENCE_CGPTLIB_H_
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#include "sysincludes.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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GPT_ERROR_CRC_CORRUPTED,
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GPT_ERROR_OUT_OF_REGION,
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GPT_ERROR_START_LBA_OVERLAP,
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GPT_ERROR_END_LBA_OVERLAP,
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GPT_ERROR_DUP_GUID,
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/* Number of errors */
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GPT_ERROR_COUNT
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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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/*
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* Size of GptData.primary_entries and secondary_entries: 128 bytes/entry * 128
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* entries.
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*/
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#define TOTAL_ENTRIES_SIZE 16384
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/*
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* The 'update_type' of GptUpdateKernelEntry(). We expose TRY and BAD only
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* because those are what verified boot needs. For more precise control on GPT
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* attribute bits, please refer to gpt_internal.h.
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*/
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enum {
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/*
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* System will be trying to boot the currently selected kernel
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* partition. Update its try count if necessary.
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*/
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GPT_UPDATE_ENTRY_TRY = 1,
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/*
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* The currently selected kernel partition failed validation. Mark
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* entry as invalid.
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*/
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GPT_UPDATE_ENTRY_BAD = 2,
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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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/* GPT primary header, from sector 1 of disk (size: 512 bytes) */
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uint8_t *primary_header;
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/* GPT secondary header, from last sector of disk (size: 512 bytes) */
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uint8_t *secondary_header;
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/* Primary GPT table, follows primary header (size: 16 KB) */
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uint8_t *primary_entries;
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/* Secondary GPT table, precedes secondary header (size: 16 KB) */
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uint8_t *secondary_entries;
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/* Size of a LBA sector, in bytes */
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uint32_t sector_bytes;
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/* Size of drive in LBA sectors, in sectors */
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uint64_t drive_sectors;
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/* Outputs */
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/* Which inputs have been modified? GPT_MODIFIED_* */
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uint8_t modified;
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/*
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* The current chromeos kernel index in partition table. -1 means not
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* found on drive. Note that GPT partition numbers are traditionally
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* 1-based, but we're using a zero-based index here.
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*/
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int current_kernel;
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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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/**
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* Initializes the GPT data structure's internal state.
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*
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* The following fields 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 GptInit(GptData *gpt);
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/**
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* Provides the location of the next kernel partition, in order of decreasing
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* priority.
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*
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* On return the start_sector parameter contains the LBA sector for the start
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* of the kernel partition, and the size parameter contains the size of the
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* kernel partition in LBA sectors. gpt.current_kernel contains the partition
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* 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 GptNextKernelEntry(GptData *gpt, uint64_t *start_sector, uint64_t *size);
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/**
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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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int GptUpdateKernelEntry(GptData *gpt, uint32_t update_type);
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#endif /* VBOOT_REFERENCE_CGPTLIB_H_ */
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