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/*
* 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 char *CACHE_NAME = "CACHE:";
static const char *MISC_NAME = "MISC:";
#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
#ifdef USE_EXT4
// Strictly speaking this doesn't have anything to do with ext4; we
// really just mean "misc is an emmc partition". We should have a
// more configurable way have describing partitions, filesystems, etc.
static const char* MISC_PARTITION =
"/dev/block/platform/sdhci-tegra.3/by-name/misc";
int get_bootloader_message(struct bootloader_message* out) {
FILE* f = fopen(MISC_PARTITION, "rb");
if (f == NULL) {
LOGE("Can't open %s\n(%s)\n", MISC_PARTITION, 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", MISC_PARTITION, strerror(errno));
return -1;
}
if (fclose(f) != 0) {
LOGE("Failed closing %s\n(%s)\n", MISC_PARTITION, strerror(errno));
return -1;
}
memcpy(out, &temp, sizeof(temp));
return 0;
}
int set_bootloader_message(const struct bootloader_message* in) {
FILE* f = fopen(MISC_PARTITION, "wb");
if (f == NULL) {
LOGE("Can't open %s\n(%s)\n", MISC_PARTITION, strerror(errno));
return -1;
}
int count = fwrite(in, sizeof(*in), 1, f);
if (count != 1) {
LOGE("Failed writing %s\n(%s)\n", MISC_PARTITION, strerror(errno));
return -1;
}
if (fclose(f) != 0) {
LOGE("Failed closing %s\n(%s)\n", MISC_PARTITION, strerror(errno));
return -1;
}
return 0;
}
#else // MTD partitions
static const int MISC_PAGES = 3; // number of pages to save
static const int MISC_COMMAND_PAGE = 1; // bootloader command is this page
int get_bootloader_message(struct bootloader_message *out) {
size_t write_size;
const MtdPartition *part = get_root_mtd_partition(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 = get_root_mtd_partition(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;
}
#endif
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