/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "bootloader.h"
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#include "common.h"
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#include "mtdutils/mtdutils.h"
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#include "roots.h"
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#include "rktools.h"
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static int get_bootloader_message_mtd(struct bootloader_message *out);
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static int set_bootloader_message_mtd(const struct bootloader_message *in);
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static int get_bootloader_message_block(struct bootloader_message *out);
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static int set_bootloader_message_block(const struct bootloader_message *in);
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int get_bootloader_message(struct bootloader_message *out) {
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if (isMtdDevice())
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return get_bootloader_message_mtd(out);
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return get_bootloader_message_block(out);
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}
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int set_bootloader_message(const struct bootloader_message *in) {
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if (isMtdDevice())
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return set_bootloader_message_mtd(in);
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return set_bootloader_message_block(in);
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}
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// ------------------------------
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// for misc partitions on MTD
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// ------------------------------
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// The Bootloader message is at 16K(0x4000) offset, we gonna to read/write 20KB
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#define MISC_SIZE ((16 + 4) << 10)
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#define CMD_OFFSET (16 << 10)
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#define MISC_NAME "misc"
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static int get_bootloader_message_mtd(struct bootloader_message *out) {
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size_t write_size;
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mtd_scan_partitions();
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const MtdPartition *part = mtd_find_partition_by_name(MISC_NAME);
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if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
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LOGE("Can't find %s\n", MISC_NAME);
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return -1;
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}
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MtdReadContext *read = mtd_read_partition(part);
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if (read == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_NAME, strerror(errno));
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return -1;
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}
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char data[MISC_SIZE];
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//to be align with write_size
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const ssize_t size = (MISC_SIZE / write_size) * write_size;
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ssize_t r = mtd_read_data(read, data, size);
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if (r != size) LOGE("Can't read %s\n(%s)\n", MISC_NAME, strerror(errno));
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mtd_read_close(read);
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if (r != size) return -1;
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memcpy(out, &data[CMD_OFFSET], sizeof(*out));
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printf("out->command = %s.\n", out->command);
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printf("out->status = %s.\n", out->status);
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printf("out->recovery = %s.\n", out->recovery);
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printf("out->systemFlag = %s.\n", out->systemFlag);
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return 0;
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}
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static int set_bootloader_message_mtd(const struct bootloader_message *in) {
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size_t write_size;
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mtd_scan_partitions();
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const MtdPartition *part = mtd_find_partition_by_name(MISC_NAME);
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if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
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LOGE("Can't find %s\n", MISC_NAME);
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return -1;
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}
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MtdReadContext *read = mtd_read_partition(part);
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if (read == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_NAME, strerror(errno));
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return -1;
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}
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char data[MISC_SIZE];
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//to be align with write_size
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const ssize_t size = (MISC_SIZE / write_size) * write_size;
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ssize_t r = mtd_read_data(read, data, size);
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if (r != size) LOGE("Can't read %s\n(%s)\n", MISC_NAME, strerror(errno));
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mtd_read_close(read);
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if (r != size) return -1;
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memcpy(&data[CMD_OFFSET], in, sizeof(*in));
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MtdWriteContext *write = mtd_write_partition(part);
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if (write == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_NAME, strerror(errno));
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return -1;
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}
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if (mtd_write_data(write, data, size) != size) {
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LOGE("Can't write %s\n(%s)\n", MISC_NAME, strerror(errno));
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mtd_write_close(write);
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return -1;
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}
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if (mtd_write_close(write)) {
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LOGE("Can't finish %s\n(%s)\n", MISC_NAME, strerror(errno));
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return -1;
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}
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LOGI("Set boot command \"%s\"\n", in->command[0] != 255 ? in->command : "");
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return 0;
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}
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// ------------------------------------
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// for misc partitions on block devices
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// ------------------------------------
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static void wait_for_device(const char* fn) {
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int tries = 0;
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int ret;
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struct stat buf;
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do {
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++tries;
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ret = stat(fn, &buf);
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if (ret) {
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printf("stat %s try %d: %s\n", fn, tries, strerror(errno));
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sleep(1);
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}
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} while (ret && tries < 10);
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if (ret) {
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printf("failed to stat %s\n", fn);
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}
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}
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static int get_bootloader_message_block(struct bootloader_message *out) {
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wait_for_device(MISC_PARTITION_NAME_BLOCK);
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FILE* f = fopen(MISC_PARTITION_NAME_BLOCK, "rb");
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if (f == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
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}
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struct bootloader_message temp;
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fseek(f, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, SEEK_SET);
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int count = fread(&temp, sizeof(temp), 1, f);
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if (count != 1) {
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LOGE("Failed reading %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
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}
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if (fclose(f) != 0) {
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LOGE("Failed closing %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
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}
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memcpy(out, &temp, sizeof(temp));
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return 0;
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}
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static int set_bootloader_message_block(const struct bootloader_message *in) {
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FILE* f = fopen(MISC_PARTITION_NAME_BLOCK, "wb");
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if (f == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
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}
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fseek(f, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, SEEK_SET);
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int count = fwrite(in, sizeof(*in), 1, f);
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if (count != 1) {
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LOGE("Failed writing %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
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}
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if (fclose(f) != 0) {
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LOGE("Failed closing %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
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}
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return 0;
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}
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