android/android_bootable_recovery
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
1e2da51172
android_bootable_recovery/bootloader.c
Koushik Dutta 0df56f4db4 wip
2011-11-16 16:00:35 -08:00

353 lines
11 KiB
C
Raw Blame History

/*
* Copyright (C) 2008 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 "bootloader.h"
#include "common.h"
#include "mtdutils/mtdutils.h"
#include "roots.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
static int get_bootloader_message_mtd(struct bootloader_message *out, const Volume* v);
static int set_bootloader_message_mtd(const struct bootloader_message *in, const Volume* v);
static int get_bootloader_message_block(struct bootloader_message *out, const Volume* v);
static int set_bootloader_message_block(const struct bootloader_message *in, const Volume* v);
int get_bootloader_message(struct bootloader_message *out) {
Volume* v = volume_for_path("/misc");
if(v)
{
if (strcmp(v->fs_type, "mtd") == 0) {
return get_bootloader_message_mtd(out, v);
} else if (strcmp(v->fs_type, "emmc") == 0) {
return get_bootloader_message_block(out, v);
}
LOGE("unknown misc partition fs_type \"%s\"\n", v->fs_type);
return -1;
}
return -1;
}
int set_bootloader_message(const struct bootloader_message *in) {
Volume* v = volume_for_path("/misc");
if(v)
{
if (strcmp(v->fs_type, "mtd") == 0) {
return set_bootloader_message_mtd(in, v);
} else if (strcmp(v->fs_type, "emmc") == 0) {
return set_bootloader_message_block(in, v);
}
LOGE("unknown misc partition fs_type \"%s\"\n", v->fs_type);
return -1;
}
return -1;
}
// ------------------------------
// for misc partitions on MTD
// ------------------------------
static const int MISC_PAGES = 3; // number of pages to save
static const int MISC_COMMAND_PAGE = 1; // bootloader command is this page
static int get_bootloader_message_mtd(struct bootloader_message *out,
const Volume* v) {
size_t write_size;
mtd_scan_partitions();
const MtdPartition *part = mtd_find_partition_by_name(v->device);
if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
LOGE("Can't find %s\n", v->device);
return -1;
}
MtdReadContext *read = mtd_read_partition(part);
if (read == NULL) {
LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
const ssize_t size = write_size * MISC_PAGES;
char data[size];
ssize_t r = mtd_read_data(read, data, size);
if (r != size) LOGE("Can't read %s\n(%s)\n", v->device, strerror(errno));
mtd_read_close(read);
if (r != size) return -1;
memcpy(out, &data[write_size * MISC_COMMAND_PAGE], sizeof(*out));
return 0;
}
static int set_bootloader_message_mtd(const struct bootloader_message *in,
const Volume* v) {
size_t write_size;
mtd_scan_partitions();
const MtdPartition *part = mtd_find_partition_by_name(v->device);
if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
LOGE("Can't find %s\n", v->device);
return -1;
}
MtdReadContext *read = mtd_read_partition(part);
if (read == NULL) {
LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
ssize_t size = write_size * MISC_PAGES;
char data[size];
ssize_t r = mtd_read_data(read, data, size);
if (r != size) LOGE("Can't read %s\n(%s)\n", v->device, strerror(errno));
mtd_read_close(read);
if (r != size) return -1;
memcpy(&data[write_size * MISC_COMMAND_PAGE], in, sizeof(*in));
MtdWriteContext *write = mtd_write_partition(part);
if (write == NULL) {
LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
if (mtd_write_data(write, data, size) != size) {
LOGE("Can't write %s\n(%s)\n", v->device, strerror(errno));
mtd_write_close(write);
return -1;
}
if (mtd_write_close(write)) {
LOGE("Can't finish %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
LOGI("Set boot command \"%s\"\n", in->command[0] != 255 ? in->command : "");
return 0;
}
// ------------------------------------
// for misc partitions on block devices
// ------------------------------------
static void wait_for_device(const char* fn) {
int tries = 0;
int ret;
struct stat buf;
do {
++tries;
ret = stat(fn, &buf);
if (ret) {
printf("stat %s try %d: %s\n", fn, tries, strerror(errno));
sleep(1);
}
} while (ret && tries < 10);
if (ret) {
printf("failed to stat %s\n", fn);
}
}
static int get_bootloader_message_block(struct bootloader_message *out,
const Volume* v) {
wait_for_device(v->device);
FILE* f = fopen(v->device, "rb");
if (f == NULL) {
LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
struct bootloader_message temp;
int count = fread(&temp, sizeof(temp), 1, f);
if (count != 1) {
LOGE("Failed reading %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
if (fclose(f) != 0) {
LOGE("Failed closing %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
memcpy(out, &temp, sizeof(temp));
return 0;
}
static int set_bootloader_message_block(const struct bootloader_message *in,
const Volume* v) {
wait_for_device(v->device);
FILE* f = fopen(v->device, "wb");
if (f == NULL) {
LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
int count = fwrite(in, sizeof(*in), 1, f);
if (count != 1) {
LOGE("Failed writing %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
if (fclose(f) != 0) {
LOGE("Failed closing %s\n(%s)\n", v->device, strerror(errno));
return -1;
}
return 0;
}
/* Update Image
*
* - will be stored in the "cache" partition
* - bad blocks will be ignored, like boot.img and recovery.img
* - the first block will be the image header (described below)
* - the size is in BYTES, inclusive of the header
* - offsets are in BYTES from the start of the update header
* - two raw bitmaps will be included, the "busy" and "fail" bitmaps
* - for dream, the bitmaps will be 320x480x16bpp RGB565
*/
#define UPDATE_MAGIC "MSM-RADIO-UPDATE"
#define UPDATE_MAGIC_SIZE 16
#define UPDATE_VERSION 0x00010000
struct update_header {
unsigned char MAGIC[UPDATE_MAGIC_SIZE];
unsigned version;
unsigned size;
unsigned image_offset;
unsigned image_length;
unsigned bitmap_width;
unsigned bitmap_height;
unsigned bitmap_bpp;
unsigned busy_bitmap_offset;
unsigned busy_bitmap_length;
unsigned fail_bitmap_offset;
unsigned fail_bitmap_length;
};
int write_update_for_bootloader(
const char *update, int update_length,
int bitmap_width, int bitmap_height, int bitmap_bpp,
const char *busy_bitmap, const char *fail_bitmap) {
if (ensure_path_unmounted("/cache")) {
LOGE("Can't unmount /cache\n");
return -1;
}
const MtdPartition *part = mtd_find_partition_by_name("cache");
if (part == NULL) {
LOGE("Can't find cache\n");
return -1;
}
MtdWriteContext *write = mtd_write_partition(part);
if (write == NULL) {
LOGE("Can't open cache\n(%s)\n", strerror(errno));
return -1;
}
/* Write an invalid (zero) header first, to disable any previous
* update and any other structured contents (like a filesystem),
* and as a placeholder for the amount of space required.
*/
struct update_header header;
memset(&header, 0, sizeof(header));
const ssize_t header_size = sizeof(header);
if (mtd_write_data(write, (char*) &header, header_size) != header_size) {
LOGE("Can't write header to cache\n(%s)\n", strerror(errno));
mtd_write_close(write);
return -1;
}
/* Write each section individually block-aligned, so we can write
* each block independently without complicated buffering.
*/
memcpy(&header.MAGIC, UPDATE_MAGIC, UPDATE_MAGIC_SIZE);
header.version = UPDATE_VERSION;
header.size = header_size;
off_t image_start_pos = mtd_erase_blocks(write, 0);
header.image_length = update_length;
if ((int) header.image_offset == -1 ||
mtd_write_data(write, update, update_length) != update_length) {
LOGE("Can't write update to cache\n(%s)\n", strerror(errno));
mtd_write_close(write);
return -1;
}
off_t busy_start_pos = mtd_erase_blocks(write, 0);
header.image_offset = mtd_find_write_start(write, image_start_pos);
header.bitmap_width = bitmap_width;
header.bitmap_height = bitmap_height;
header.bitmap_bpp = bitmap_bpp;
int bitmap_length = (bitmap_bpp + 7) / 8 * bitmap_width * bitmap_height;
header.busy_bitmap_length = busy_bitmap != NULL ? bitmap_length : 0;
if ((int) header.busy_bitmap_offset == -1 ||
mtd_write_data(write, busy_bitmap, bitmap_length) != bitmap_length) {
LOGE("Can't write bitmap to cache\n(%s)\n", strerror(errno));
mtd_write_close(write);
return -1;
}
off_t fail_start_pos = mtd_erase_blocks(write, 0);
header.busy_bitmap_offset = mtd_find_write_start(write, busy_start_pos);
header.fail_bitmap_length = fail_bitmap != NULL ? bitmap_length : 0;
if ((int) header.fail_bitmap_offset == -1 ||
mtd_write_data(write, fail_bitmap, bitmap_length) != bitmap_length) {
LOGE("Can't write bitmap to cache\n(%s)\n", strerror(errno));
mtd_write_close(write);
return -1;
}
mtd_erase_blocks(write, 0);
header.fail_bitmap_offset = mtd_find_write_start(write, fail_start_pos);
/* Write the header last, after all the blocks it refers to, so that
* when the magic number is installed everything is valid.
*/
if (mtd_write_close(write)) {
LOGE("Can't finish writing cache\n(%s)\n", strerror(errno));
return -1;
}
write = mtd_write_partition(part);
if (write == NULL) {
LOGE("Can't reopen cache\n(%s)\n", strerror(errno));
return -1;
}
if (mtd_write_data(write, (char*) &header, header_size) != header_size) {
LOGE("Can't rewrite header to cache\n(%s)\n", strerror(errno));
mtd_write_close(write);
return -1;
}
if (mtd_erase_blocks(write, 0) != image_start_pos) {
LOGE("Misalignment rewriting cache\n(%s)\n", strerror(errno));
mtd_write_close(write);
return -1;
}
if (mtd_write_close(write)) {
LOGE("Can't finish header of cache\n(%s)\n", strerror(errno));
return -1;
}
return 0;
}
Reference in New Issue View Git Blame Copy Permalink