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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>
#include "bootloader.h"
#define SECTOR_SIZE 512
#define NUM_SECONDARY_GPT_SECTORS 34
#define PIT_PARTITION_TABLE_SIZE 0x1000 // 4KB
#define BOOT_PART_LEN 0x20000 // 128KB
#define SBL_OFFSET (PIT_PARTITION_TABLE_SIZE + (BOOT_PART_LEN * 4))
#define SMALL_BUFFER_SIZE 0x20
// A combination of these defines the specification of the device.
#define OMAP4460 0x1
#define OMAP4430 0x2
#define CHIP_HS 0x4
#define CHIP_EMU 0x8
#define MSV_PROD 0x10
// Location of the PIT partition table in EMMC
#define PIT_PARTITION_TABLE_LOCATION 0x4400
static const char* FAMILY_LOCATION = "/sys/board_properties/soc/family";
static const char* TYPE_LOCATION = "/sys/board_properties/soc/type";
static const char* MSV_LOCATION = "/sys/board_properties/soc/msv";
static const char* MMC_LOCATION = "/dev/block/mmcblk0";
/* pit structure = header + (pit partition info * n) */
struct pit_header {
unsigned int magic;
int count; /* onenand + mmc partitions */
int dummy[5];
} __attribute__((packed));
struct pit_partinfo {
int binary; /* BINARY_TYPE_ */
int device; /* PARTITION_DEV_TYPE_ */
int id; /* partition id */
int attribute; /* PARTITION_ATTR_ */
int update; /* PARTITION_UPDATE_ATTR_ - dedicated. */
unsigned int blksize; /* mmc start sector */
unsigned int blklen; /* sector count */
unsigned int offset; /* file offset (in TAR) */
unsigned int filesize; /* file size */
char name[32]; /* partition name */
char filename[32]; /* file name */
char deltaname[32]; /* delta file name - dedicated. */
} __attribute__((packed));
unsigned int read_whole_file(const char* fname, char* buffer,
int buffer_size) {
memset(buffer, 0, buffer_size);
FILE* f = fopen(fname, "rb");
if (f == NULL) {
fprintf(stderr, "Cannot open %s!\n", fname);
return -1;
}
int read_byte_count = fread(buffer, 1, buffer_size - 1, f);
fclose(f);
if (read_byte_count < 0) {
fprintf(stderr, "Couldn't read %s\n", fname);
return -1;
}
// Remove any newlines at the end.
while (buffer[read_byte_count - 1] == '\n') {
buffer[--read_byte_count] = 0;
}
return 0;
}
// Get the specifications for this device
int get_specification() {
int spec = 0;
char file_data[SMALL_BUFFER_SIZE];
if (read_whole_file(FAMILY_LOCATION, file_data, SMALL_BUFFER_SIZE) == 0) {
if (strcmp(file_data, "OMAP4430") == 0) {
spec |= OMAP4430;
} else if (strcmp(file_data, "OMAP4460") == 0) {
spec |= OMAP4460;
} else {
fprintf(stderr, "Unknown family: %s\n", file_data);
return -1;
}
} else {
fprintf(stderr, "No family\n");
return -1;
}
if (read_whole_file(TYPE_LOCATION, file_data, SMALL_BUFFER_SIZE) == 0) {
if (strcmp(file_data, "HS") == 0) {
spec |= CHIP_HS;
} else if (strcmp(file_data, "EMU") == 0) {
spec |= CHIP_EMU;
} else {
fprintf(stderr, "Unknown chip type: %s\n", file_data);
return -1;
}
} else {
fprintf(stderr, "No chip type\n");
return -1;
}
// MSV is either prod (non-zero) or eng (zero). Default to eng.
if (read_whole_file(MSV_LOCATION, file_data, SMALL_BUFFER_SIZE) == 0) {
if (strtoul(file_data, NULL, 16) != 0) {
spec |= MSV_PROD;
}
} else {
fprintf(stderr, "No msv\n");
}
return spec;
}
// Four different xloaders are supported by bootloader.img:
// 4460 EMU, 4460 HS (eng), 4460 HS (prod), 4430 HS.
// The layout of the bootloader.img is:
//
// PIT Partition table (4KB)
// 4460 EMU xloader (128KB)
// 4460 HS (eng) xloader (128KB)
// 4460 HS (prod) xloader (128KB)
// 4430 HS xloader(128KB)
// sbl (the rest)
int get_xloader_offset() {
int spec = get_specification();
if (spec < 0) {
return -1;
}
if (spec & OMAP4460 &&
spec & CHIP_EMU) {
return 0;
} else if (spec & OMAP4460 &&
spec & CHIP_HS &&
!(spec & MSV_PROD)) {
return BOOT_PART_LEN;
} else if (spec & OMAP4460 &&
spec & CHIP_HS &&
spec & MSV_PROD) {
return BOOT_PART_LEN * 2;
} else if (spec & OMAP4430 &&
spec & CHIP_HS) {
return BOOT_PART_LEN * 3;
}
fprintf(stderr, "Unsupported spec for bootloader.img: %d", spec);
return -1;
}
int write_pit_partition_table(const char* image_data,
size_t image_size) {
int written = 0;
int close_status = 0;
int to_write;
const char* curr;
int mmcfd = open(MMC_LOCATION, O_RDWR);
if (mmcfd < 0) {
fprintf(stderr, "Could not open %s\n", MMC_LOCATION);
return -1;
}
// zero out gpt magic field
if (lseek(mmcfd, SECTOR_SIZE, SEEK_SET) < 0) {
fprintf(stderr, "Couldn't seek to the start of sector 1\n");
close(mmcfd);
return -1;
}
char buf[SECTOR_SIZE];
if (read(mmcfd, buf, SECTOR_SIZE) != SECTOR_SIZE) {
fprintf(stderr, "Failed to read sector 1\n");
close(mmcfd);
return -1;
}
memset(buf, 0, 8);
if (lseek(mmcfd, SECTOR_SIZE, SEEK_SET) < 0) {
fprintf(stderr, "Couldn't seek to the start of sector 1, part 2\n");
close(mmcfd);
return -1;
}
to_write = SECTOR_SIZE;
curr = buf;
while (to_write > 0) {
written = write(mmcfd, curr, to_write);
if (written < 0 && errno != EINTR) {
fprintf(stderr, "Couldn't overwrite sector 1\n");
close(mmcfd);
return -1;
}
if (written > 0) {
to_write -= written;
curr += written;
}
}
// modify the pit partition info to reflect userdata size
// before writing the pit partition table
char pit_partition_copy[PIT_PARTITION_TABLE_SIZE];
memcpy(pit_partition_copy, image_data, PIT_PARTITION_TABLE_SIZE);
struct pit_header* hd = (struct pit_header*) pit_partition_copy;
int i;
for (i = 0; i < hd->count; i++) {
struct pit_partinfo* pi = (struct pit_partinfo*)
(pit_partition_copy + sizeof(*hd) + sizeof(*pi) * i);
if (strcmp(pi->name, "userdata") == 0) {
unsigned int num_sectors;
if (ioctl(mmcfd, BLKGETSIZE, &num_sectors) < 0) {
fprintf(stderr, "Couldn't get sector count\n");
close(mmcfd);
return -1;
}
// There are NUM_SECONDARY_GPT_SECTORS sectors reserved at the end of the
// device to hold a backup copy of the GPT, so we subtract that number.
pi->blklen = num_sectors - pi->blksize - NUM_SECONDARY_GPT_SECTORS;
break;
}
}
if (i == hd->count) {
fprintf(stderr, "No userdata partition found\n");
close(mmcfd);
return -1;
}
// copy the modified pit partition table data to the correct location
if (lseek(mmcfd, PIT_PARTITION_TABLE_LOCATION, SEEK_SET) < 0) {
fprintf(stderr, "Couldn't seek to the pit partition table location\n");
close(mmcfd);
return -1;
}
to_write = PIT_PARTITION_TABLE_SIZE;
curr = pit_partition_copy;
while (to_write > 0) {
written = write(mmcfd, curr, to_write);
if (written < 0 && errno != EINTR) {
fprintf(stderr, "Failed writing pit partition table\n");
close(mmcfd);
return -1;
}
if (written > 0) {
to_write -= written;
curr += written;
}
}
if (close(mmcfd) != 0) {
fprintf(stderr, "Failed to close file\n");
return -1;
}
return 0;
}
int write_xloader(const char* image_data,
size_t image_size,
const char* xloader_loc) {
int xloader_offset = get_xloader_offset();
if (xloader_offset < 0) {
return -1;
}
// The offsets into xloader part of the bootloader image
xloader_offset += PIT_PARTITION_TABLE_SIZE;
FILE* xloader = fopen(xloader_loc, "r+b");
if (xloader == NULL) {
fprintf(stderr, "Could not open %s\n", xloader_loc);
return -1;
}
// index into the correct xloader offset
int written = fwrite(image_data+xloader_offset, 1, BOOT_PART_LEN, xloader);
int close_status = fclose(xloader);
if (written != BOOT_PART_LEN || close_status != 0) {
fprintf(stderr, "Failed writing to /xloader\n");
return -1;
}
return 0;
}
int write_sbl(const char* image_data,
size_t image_size,
const char* sbl_loc) {
unsigned int sbl_size = image_size - SBL_OFFSET;
FILE* sbl = fopen(sbl_loc, "r+b");
if (sbl == NULL) {
fprintf(stderr, "Could not open %s\n", sbl_loc);
return -1;
}
int written = fwrite(image_data+SBL_OFFSET, 1, sbl_size, sbl);
int close_status = fclose(sbl);
if (written != sbl_size || close_status != 0) {
fprintf(stderr, "Failed writing to /sbl\n");
return -1;
}
return 0;
}
int update_bootloader(const char* image_data,
size_t image_size,
const char* xloader_loc,
const char* sbl_loc) {
if (image_size < SBL_OFFSET) {
fprintf(stderr, "image size %d is too small\n", image_size);
return -1;
}
if (write_pit_partition_table(image_data, image_size) < 0) {
return -1;
}
if (write_xloader(image_data, image_size, xloader_loc) < 0) {
return -1;
}
if (write_sbl(image_data, image_size, sbl_loc) < 0) {
return -1;
}
return 0;
}
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