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126 lines
4.3 KiB
126 lines
4.3 KiB
// Copyright (c) 2012 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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#include <string.h>
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#include "cgpt.h"
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#include "cgptlib_internal.h"
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#include "vboot_host.h"
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static void AllocAndClear(uint8_t **buf, uint64_t size) {
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if (*buf) {
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memset(*buf, 0, size);
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} else {
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*buf = calloc(1, size);
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if (!*buf) {
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Error("Cannot allocate %lu bytes.\n", size);
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abort();
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}
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}
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}
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static int GptCreate(struct drive *drive, CgptCreateParams *params) {
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// Allocate and/or erase the data.
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// We cannot assume the GPT headers or entry arrays have been allocated
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// by GptLoad() because those fields might have failed validation checks.
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AllocAndClear(&drive->gpt.primary_header,
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drive->gpt.sector_bytes * GPT_HEADER_SECTORS);
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AllocAndClear(&drive->gpt.secondary_header,
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drive->gpt.sector_bytes * GPT_HEADER_SECTORS);
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drive->gpt.modified |= (GPT_MODIFIED_HEADER1 | GPT_MODIFIED_ENTRIES1 |
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GPT_MODIFIED_HEADER2 | GPT_MODIFIED_ENTRIES2);
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// Initialize a blank set
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if (!params->zap) {
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GptHeader *h = (GptHeader *)drive->gpt.primary_header;
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memcpy(h->signature, GPT_HEADER_SIGNATURE, GPT_HEADER_SIGNATURE_SIZE);
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h->revision = GPT_HEADER_REVISION;
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h->size = sizeof(GptHeader);
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h->my_lba = GPT_PMBR_SECTORS; /* The second sector on drive. */
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h->alternate_lba = drive->gpt.gpt_drive_sectors - GPT_HEADER_SECTORS;
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if (CGPT_OK != GenerateGuid(&h->disk_uuid)) {
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Error("Unable to generate new GUID.\n");
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return -1;
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}
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/* Calculate number of entries */
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h->size_of_entry = sizeof(GptEntry);
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h->number_of_entries = MAX_NUMBER_OF_ENTRIES;
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if (drive->gpt.flags & GPT_FLAG_EXTERNAL) {
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// We might have smaller space for the GPT table. Scale accordingly.
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//
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// +------+------------+---------------+-----+--------------+-----------+
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// | PMBR | Prim. Head | Prim. Entries | ... | Sec. Entries | Sec. Head |
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// +------+------------+---------------+-----+--------------+-----------+
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//
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// Half the size of gpt_drive_sectors must be big enough to hold PMBR +
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// GPT Header + Entries Table, though the secondary structures do not
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// contain PMBR.
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size_t required_headers_size =
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(GPT_PMBR_SECTORS + GPT_HEADER_SECTORS) * drive->gpt.sector_bytes;
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size_t min_entries_size = MIN_NUMBER_OF_ENTRIES * h->size_of_entry;
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size_t required_min_size = required_headers_size + min_entries_size;
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size_t half_size =
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(drive->gpt.gpt_drive_sectors / 2) * drive->gpt.sector_bytes;
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if (half_size < required_min_size) {
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Error("Not enough space to store GPT structures. Required %d bytes.\n",
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required_min_size * 2);
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return -1;
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}
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size_t max_entries =
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(half_size - required_headers_size) / h->size_of_entry;
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if (h->number_of_entries > max_entries) {
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h->number_of_entries = max_entries;
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}
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}
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/* Then use number of entries to calculate entries_lba. */
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h->entries_lba = h->my_lba + GPT_HEADER_SECTORS;
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if (!(drive->gpt.flags & GPT_FLAG_EXTERNAL)) {
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h->entries_lba += params->padding;
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h->first_usable_lba = h->entries_lba + CalculateEntriesSectors(h);
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h->last_usable_lba = (drive->gpt.streaming_drive_sectors - GPT_HEADER_SECTORS -
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CalculateEntriesSectors(h) - 1);
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} else {
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h->first_usable_lba = params->padding;
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h->last_usable_lba = (drive->gpt.streaming_drive_sectors - 1);
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}
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size_t entries_size = h->number_of_entries * h->size_of_entry;
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AllocAndClear(&drive->gpt.primary_entries, entries_size);
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AllocAndClear(&drive->gpt.secondary_entries, entries_size);
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// Copy to secondary
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RepairHeader(&drive->gpt, MASK_PRIMARY);
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UpdateCrc(&drive->gpt);
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}
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return 0;
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}
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int CgptCreate(CgptCreateParams *params) {
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struct drive drive;
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if (params == NULL)
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return CGPT_FAILED;
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if (CGPT_OK != DriveOpen(params->drive_name, &drive, O_RDWR,
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params->drive_size))
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return CGPT_FAILED;
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if (GptCreate(&drive, params))
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goto bad;
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// Write it all out
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return DriveClose(&drive, 1);
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bad:
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DriveClose(&drive, 0);
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return CGPT_FAILED;
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}
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