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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 <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "cgpt.h"
#include "cgptlib_internal.h"
#include "cgpt_params.h"
#include "vboot_host.h"
int CgptGetBootPartitionNumber(CgptBootParams *params) {
struct drive drive;
int gpt_retval= 0;
int retval;
if (params == NULL)
return CGPT_FAILED;
if (CGPT_OK != DriveOpen(params->drive_name, &drive, O_RDONLY,
params->drive_size))
return CGPT_FAILED;
if (GPT_SUCCESS != (gpt_retval = GptValidityCheck(&drive.gpt))) {
Error("GptValidityCheck() returned %d: %s\n",
gpt_retval, GptError(gpt_retval));
retval = CGPT_FAILED;
goto done;
}
if (CGPT_OK != ReadPMBR(&drive)) {
Error("Unable to read PMBR\n");
retval = CGPT_FAILED;
goto done;
}
char buf[GUID_STRLEN];
GuidToStr(&drive.pmbr.boot_guid, buf, sizeof(buf));
int numEntries = GetNumberOfEntries(&drive);
int i;
for(i = 0; i < numEntries; i++) {
GptEntry *entry = GetEntry(&drive.gpt, ANY_VALID, i);
if (GuidEqual(&entry->unique, &drive.pmbr.boot_guid)) {
params->partition = i + 1;
retval = CGPT_OK;
goto done;
}
}
Error("Didn't find any boot partition\n");
params->partition = 0;
retval = CGPT_FAILED;
done:
(void) DriveClose(&drive, 1);
return retval;
}
int CgptBoot(CgptBootParams *params) {
struct drive drive;
int retval = 1;
int gpt_retval= 0;
int mode = O_RDONLY;
if (params == NULL)
return CGPT_FAILED;
if (params->create_pmbr || params->partition || params->bootfile)
mode = O_RDWR;
if (CGPT_OK != DriveOpen(params->drive_name, &drive, mode,
params->drive_size)) {
return CGPT_FAILED;
}
if (CGPT_OK != ReadPMBR(&drive)) {
Error("Unable to read PMBR\n");
goto done;
}
if (params->create_pmbr) {
drive.pmbr.magic[0] = 0x1d;
drive.pmbr.magic[1] = 0x9a;
drive.pmbr.sig[0] = 0x55;
drive.pmbr.sig[1] = 0xaa;
memset(&drive.pmbr.part, 0, sizeof(drive.pmbr.part));
drive.pmbr.part[0].f_head = 0x00;
drive.pmbr.part[0].f_sect = 0x02;
drive.pmbr.part[0].f_cyl = 0x00;
drive.pmbr.part[0].type = 0xee;
drive.pmbr.part[0].l_head = 0xff;
drive.pmbr.part[0].l_sect = 0xff;
drive.pmbr.part[0].l_cyl = 0xff;
drive.pmbr.part[0].f_lba = htole32(1);
uint32_t max = 0xffffffff;
if (drive.gpt.streaming_drive_sectors < 0xffffffff)
max = drive.gpt.streaming_drive_sectors - 1;
drive.pmbr.part[0].num_sect = htole32(max);
}
if (params->partition) {
if (GPT_SUCCESS != (gpt_retval = GptValidityCheck(&drive.gpt))) {
Error("GptValidityCheck() returned %d: %s\n",
gpt_retval, GptError(gpt_retval));
goto done;
}
if (params->partition > GetNumberOfEntries(&drive)) {
Error("invalid partition number: %d\n", params->partition);
goto done;
}
uint32_t index = params->partition - 1;
GptEntry *entry = GetEntry(&drive.gpt, ANY_VALID, index);
memcpy(&drive.pmbr.boot_guid, &entry->unique, sizeof(Guid));
}
if (params->bootfile) {
int fd = open(params->bootfile, O_RDONLY);
if (fd < 0) {
Error("Can't read %s: %s\n", params->bootfile, strerror(errno));
goto done;
}
int n = read(fd, drive.pmbr.bootcode, sizeof(drive.pmbr.bootcode));
if (n < 1) {
Error("problem reading %s: %s\n", params->bootfile, strerror(errno));
close(fd);
goto done;
}
close(fd);
}
char buf[GUID_STRLEN];
GuidToStr(&drive.pmbr.boot_guid, buf, sizeof(buf));
printf("%s\n", buf);
// Write it all out, if needed.
if (mode == O_RDONLY || CGPT_OK == WritePMBR(&drive))
retval = 0;
done:
(void) DriveClose(&drive, 1);
return retval;
}
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