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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
117 lines
3.7 KiB
C
117 lines
3.7 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_INTERNAL_H_
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#define VBOOT_REFERENCE_CGPTLIB_INTERNAL_H_
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#include <stdint.h>
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#include "cgptlib.h"
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#include "gpt.h"
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/* If gpt->current_kernel is this value, means either:
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* 1. an initial value before scanning GPT entries,
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* 2. after scanning, no any valid kernel is found.
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*/
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#define CGPT_KERNEL_ENTRY_NOT_FOUND (-1)
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/* Bit definitions and masks for GPT attributes.
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*
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* 63 -- do not automounting
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* 62 -- hidden
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* 60 -- read-only
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* :
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* 56 -- success
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* 55,52 -- tries
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* 51,48 -- priority
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* 0 -- system partition
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*/
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#define CGPT_ATTRIBUTE_SUCCESSFUL_OFFSET 56
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#define CGPT_ATTRIBUTE_MAX_SUCCESSFUL (1ULL)
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#define CGPT_ATTRIBUTE_SUCCESSFUL_MASK (CGPT_ATTRIBUTE_MAX_SUCCESSFUL << \
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CGPT_ATTRIBUTE_SUCCESSFUL_OFFSET)
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#define CGPT_ATTRIBUTE_TRIES_OFFSET 52
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#define CGPT_ATTRIBUTE_MAX_TRIES (15ULL)
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#define CGPT_ATTRIBUTE_TRIES_MASK (CGPT_ATTRIBUTE_MAX_TRIES << \
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CGPT_ATTRIBUTE_TRIES_OFFSET)
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#define CGPT_ATTRIBUTE_PRIORITY_OFFSET 48
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#define CGPT_ATTRIBUTE_MAX_PRIORITY (15ULL)
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#define CGPT_ATTRIBUTE_PRIORITY_MASK (CGPT_ATTRIBUTE_MAX_PRIORITY << \
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CGPT_ATTRIBUTE_PRIORITY_OFFSET)
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/* Defines ChromeOS-specific limitation on GPT */
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/* TODO: Move these to cgptlib_internal.h */
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#define MIN_SIZE_OF_HEADER 92
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#define MAX_SIZE_OF_HEADER 512
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#define MIN_SIZE_OF_ENTRY 128
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#define MAX_SIZE_OF_ENTRY 512
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#define SIZE_OF_ENTRY_MULTIPLE 8
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#define MIN_NUMBER_OF_ENTRIES 32
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#define MAX_NUMBER_OF_ENTRIES 512
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#define TOTAL_ENTRIES_SIZE 16384 /* usual case is 128 bytes * 128 entries */
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/* Defines GPT sizes */
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#define GPT_PMBR_SECTOR 1 /* size (in sectors) of PMBR */
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#define GPT_HEADER_SECTOR 1
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#define GPT_ENTRIES_SECTORS 32 /* assume sector size if 512 bytes, then
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* (TOTAL_ENTRIES_SIZE / 512) = 32 */
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/* alias name of index in internal array for primary and secondary header and
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* entries. */
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enum {
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PRIMARY = 0,
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SECONDARY = 1,
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MASK_NONE = 0,
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MASK_PRIMARY = 1,
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MASK_SECONDARY = 2,
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MASK_BOTH = 3,
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};
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/* Verify GptData parameters are sane. */
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int CheckParameters(GptData* gpt);
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/* Check header fields.
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*
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* Returns 0 if header is valid, 1 if invalid. */
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int CheckHeader(GptHeader* h, int is_secondary, uint64_t drive_sectors);
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/* Calculate and return the header CRC. */
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uint32_t HeaderCrc(GptHeader* h);
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/* Check entries.
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*
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* Returns 0 if entries are valid, 1 if invalid. */
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int CheckEntries(GptEntry* entries, GptHeader* h, uint64_t drive_sectors);
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/* Check GptData, headers, entries.
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*
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* If successful, sets gpt->valid_headers and gpt->valid_entries and returns
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* GPT_SUCCESS.
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*
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* On error, returns a GPT_ERROR_* return code. */
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int GptSanityCheck(GptData* gpt);
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/* Repairs GPT data by copying from one set of valid headers/entries to the
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* other. Assumes GptSanityCheck() has been run to determine which headers
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* and/or entries are already valid. */
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void GptRepair(GptData* gpt);
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/* Getters and setters for partition attribute fields. */
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int GetEntrySuccessful(const GptEntry* e);
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int GetEntryPriority(const GptEntry* e);
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int GetEntryTries(const GptEntry* e);
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void SetEntrySuccessful(GptEntry* e, int successful);
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void SetEntryPriority(GptEntry* e, int priority);
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void SetEntryTries(GptEntry* e, int tries);
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/* Return 1 if the entry is unused, 0 if it is used. */
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int IsUnusedEntry(const GptEntry* e);
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/* Returns 1 if the entry is a Chrome OS kernel partition, else 0. */
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int IsKernelEntry(const GptEntry* e);
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#endif /* VBOOT_REFERENCE_CGPTLIB_INTERNAL_H_ */
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