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// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string.h>
#include "cgpt.h"
#include "cgptlib_internal.h"
#include "vboot_host.h"
static int GptCreate(struct drive *drive, CgptCreateParams *params) {
// Erase the data
memset(drive->gpt.primary_header, 0,
drive->gpt.sector_bytes * GPT_HEADER_SECTORS);
memset(drive->gpt.secondary_header, 0,
drive->gpt.sector_bytes * GPT_HEADER_SECTORS);
memset(drive->gpt.primary_entries, 0,
drive->gpt.sector_bytes * GPT_ENTRIES_SECTORS);
memset(drive->gpt.secondary_entries, 0,
drive->gpt.sector_bytes * GPT_ENTRIES_SECTORS);
drive->gpt.modified |= (GPT_MODIFIED_HEADER1 | GPT_MODIFIED_ENTRIES1 |
GPT_MODIFIED_HEADER2 | GPT_MODIFIED_ENTRIES2);
// Initialize a blank set
if (!params->zap) {
GptHeader *h = (GptHeader *)drive->gpt.primary_header;
memcpy(h->signature, GPT_HEADER_SIGNATURE, GPT_HEADER_SIGNATURE_SIZE);
h->revision = GPT_HEADER_REVISION;
h->size = sizeof(GptHeader);
h->my_lba = GPT_PMBR_SECTORS; /* The second sector on drive. */
h->alternate_lba = drive->gpt.drive_sectors - GPT_HEADER_SECTORS;
h->entries_lba = h->my_lba + GPT_HEADER_SECTORS + params->padding;
h->first_usable_lba = h->entries_lba + GPT_ENTRIES_SECTORS;
h->last_usable_lba = (drive->gpt.drive_sectors - GPT_HEADER_SECTORS -
GPT_ENTRIES_SECTORS - 1);
if (CGPT_OK != GenerateGuid(&h->disk_uuid)) {
Error("Unable to generate new GUID.\n");
return -1;
}
h->number_of_entries = 128;
h->size_of_entry = sizeof(GptEntry);
// Copy to secondary
RepairHeader(&drive->gpt, MASK_PRIMARY);
UpdateCrc(&drive->gpt);
}
return 0;
}
static int MtdCreate(struct drive *drive, CgptCreateParams *params) {
MtdDiskLayout *h = &drive->mtd.primary;
memset(h, 0, sizeof(*h));
drive->mtd.modified = 1;
if (!params->zap) {
// Prep basic parameters
memcpy(h->signature, MTD_DRIVE_SIGNATURE, sizeof(h->signature));
h->size = sizeof(*h);
h->first_offset = 0;
h->last_offset = (drive->mtd.drive_sectors * drive->mtd.sector_bytes) - 1;
h->crc32 = MtdHeaderCrc(h);
}
if (params->size) {
h->last_offset = params->size - 1;
drive->size = params->size;
drive->mtd.drive_sectors = drive->size / drive->mtd.sector_bytes;
} else if (!drive->mtd.drive_sectors) {
Error("MTD create with params->size == 0 && drive->mtd.drive_sectors == 0");
return -1;
}
return 0;
}
int CgptCreate(CgptCreateParams *params) {
struct drive drive;
if (params == NULL)
return CGPT_FAILED;
if (CGPT_OK != DriveOpen(params->drive_name, &drive, O_RDWR))
return CGPT_FAILED;
if (drive.is_mtd) {
if (MtdCreate(&drive, params))
goto bad;
} else {
if (GptCreate(&drive, params))
goto bad;
}
// Write it all out
return DriveClose(&drive, 1);
bad:
DriveClose(&drive, 0);
return CGPT_FAILED;
}
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