/*
* 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>
static const int MISC_PAGES = 3; // number of pages to save
static const int MISC_COMMAND_PAGE = 1; // bootloader command is this page
#undef LOGE
#define LOGE(...) fprintf(stderr, "E:" __VA_ARGS__)
#ifdef LOG_VERBOSE
static void dump_data(const char *data, int len) {
int pos;
for (pos = 0; pos < len; ) {
printf("%05x: %02x", pos, data[pos]);
for (++pos; pos < len && (pos % 24) != 0; ++pos) {
printf(" %02x", data[pos]);
}
printf("\n");
}
}
#endif
int get_bootloader_message(struct bootloader_message *out) {
size_t write_size;
const MtdPartition *part = mtd_find_partition_by_name(MISC_NAME);
if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
LOGE("Can't find %s\n", MISC_NAME);
return -1;
}
MtdReadContext *read = mtd_read_partition(part);
if (read == NULL) {
LOGE("Can't open %s\n(%s)\n", MISC_NAME, 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", MISC_NAME, strerror(errno));
mtd_read_close(read);
if (r != size) return -1;
#ifdef LOG_VERBOSE
printf("\n--- get_bootloader_message ---\n");
dump_data(data, size);
printf("\n");
#endif
memcpy(out, &data[write_size * MISC_COMMAND_PAGE], sizeof(*out));
return 0;
}
int set_bootloader_message(const struct bootloader_message *in) {
size_t write_size;
const MtdPartition *part = mtd_find_partition_by_name(MISC_NAME);
if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
LOGE("Can't find %s\n", MISC_NAME);
return -1;
}
MtdReadContext *read = mtd_read_partition(part);
if (read == NULL) {
LOGE("Can't open %s\n(%s)\n", MISC_NAME, 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", MISC_NAME, strerror(errno));
mtd_read_close(read);
if (r != size) return -1;
memcpy(&data[write_size * MISC_COMMAND_PAGE], in, sizeof(*in));
#ifdef LOG_VERBOSE
printf("\n--- set_bootloader_message ---\n");
dump_data(data, size);
printf("\n");
#endif
MtdWriteContext *write = mtd_write_partition(part);
if (write == NULL) {
LOGE("Can't open %s\n(%s)\n", MISC_NAME, strerror(errno));
return -1;
}
if (mtd_write_data(write, data, size) != size) {
LOGE("Can't write %s\n(%s)\n", MISC_NAME, strerror(errno));
mtd_write_close(write);
return -1;
}
if (mtd_write_close(write)) {
LOGE("Can't finish %s\n(%s)\n", MISC_NAME, strerror(errno));
return -1;
}
LOGI("Set boot command \"%s\"\n", in->command[0] != 255 ? in->command : "");
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
*/
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,
const char *log_filename) {
const MtdPartition *part = mtd_find_partition_by_name(CACHE_NAME);
if (part == NULL) {
LOGE("Can't find %s\n", CACHE_NAME);
return -1;
}
MtdWriteContext *write = mtd_write_partition(part);
if (write == NULL) {
LOGE("Can't open %s\n(%s)\n", CACHE_NAME, 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 %s\n(%s)\n", CACHE_NAME, 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;
if (log_filename != NULL) {
// Write 1 byte into the following block, then fill to the end
// in order to reserve that block. We'll use the block to
// send a copy of the log through to the next invocation of
// recovery. We write the log as late as possible in order to
// capture any messages emitted by this function.
mtd_erase_blocks(write, 0);
if (mtd_write_data(write, (char*) &header, 1) != 1) {
LOGE("Can't write log block to %s\n(%s)\n",
CACHE_NAME, strerror(errno));
mtd_write_close(write);
return -1;
}
}
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 %s\n(%s)\n", CACHE_NAME, 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;
LOGE("writing busy bitmap\n");
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 %s\n(%s)\n", CACHE_NAME, strerror(errno));
mtd_write_close(write);
return -1;
}
LOGE("busy bitmap written\n");
off_t fail_start_pos = mtd_erase_blocks(write, 0);
LOGE("block padded\n");
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 %s\n(%s)\n", CACHE_NAME, strerror(errno));
mtd_write_close(write);
return -1;
}
LOGE("finishing block\n");
mtd_erase_blocks(write, 0);
LOGE("finished block\n");
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 %s\n(%s)\n", CACHE_NAME, strerror(errno));
return -1;
}
write = mtd_write_partition(part);
if (write == NULL) {
LOGE("Can't reopen %s\n(%s)\n", CACHE_NAME, strerror(errno));
return -1;
}
if (mtd_write_data(write, (char*) &header, header_size) != header_size) {
LOGE("Can't rewrite header to %s\n(%s)\n", CACHE_NAME, strerror(errno));
mtd_write_close(write);
return -1;
}
if (log_filename != NULL) {
LOGE("writing log\n");
size_t erase_size;
if (mtd_partition_info(part, NULL, &erase_size, NULL) != 0) {
LOGE("Error reading block size\n(%s)\n", strerror(errno));
mtd_write_close(write);
return -1;
}
mtd_erase_blocks(write, 0);
if (erase_size > 0) {
char* log = malloc(erase_size);
FILE* f = fopen(log_filename, "rb");
// The fseek() may fail if it tries to go before the
// beginning of the log, but that's okay because we want
// to be positioned at the start anyway.
fseek(f, -(erase_size-sizeof(size_t)-LOG_MAGIC_SIZE), SEEK_END);
memcpy(log, LOG_MAGIC, LOG_MAGIC_SIZE);
size_t read = fread(log+sizeof(size_t)+LOG_MAGIC_SIZE,
1, erase_size-sizeof(size_t)-LOG_MAGIC_SIZE, f);
LOGI("read %d bytes from log\n", (int)read);
*(size_t *)(log + LOG_MAGIC_SIZE) = read;
fclose(f);
if (mtd_write_data(write, log, erase_size) != erase_size) {
LOGE("failed to store log in cache partition\n(%s)\n",
strerror(errno));
mtd_write_close(write);
}
free(log);
}
}
if (mtd_erase_blocks(write, 0) != image_start_pos) {
LOGE("Misalignment rewriting %s\n(%s)\n", CACHE_NAME, strerror(errno));
mtd_write_close(write);
return -1;
}
LOGE("closing partition\n");
if (mtd_write_close(write)) {
LOGE("Can't finish header of %s\n(%s)\n", CACHE_NAME, strerror(errno));
return -1;
}
return 0;
}