/*
* 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 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 (strcmp(v->fs_type, "mtd") == 0) {
return get_bootloader_message_mtd(out, v);
} else if (strcmp(v->fs_type, "block") == 0) {
return get_bootloader_message_block(out, v);
}
LOGE("unknown misc partition fs_type \"%s\"\n", v->fs_type);
return -1;
}
int set_bootloader_message(const struct bootloader_message *in) {
Volume* v = volume_for_path("/misc");
if (strcmp(v->fs_type, "mtd") == 0) {
return set_bootloader_message_mtd(in, v);
} else if (strcmp(v->fs_type, "block") == 0) {
return set_bootloader_message_block(in, v);
}
LOGE("unknown misc partition fs_type \"%s\"\n", v->fs_type);
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 int get_bootloader_message_block(struct bootloader_message *out,
const Volume* v) {
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) {
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;
}
