diff options
Diffstat (limited to 'bootloader.cpp')
| -rw-r--r-- | bootloader.cpp | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/bootloader.cpp b/bootloader.cpp new file mode 100644 index 000000000..baaddc55f --- /dev/null +++ b/bootloader.cpp @@ -0,0 +1,202 @@ +/* + * 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 == NULL) { + LOGE("Cannot load volume /misc!\n"); + return -1; + } + 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; +} + +int set_bootloader_message(const struct bootloader_message *in) { + Volume* v = volume_for_path("/misc"); + if (v == NULL) { + LOGE("Cannot load volume /misc!\n"); + return -1; + } + 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; +} + +// ------------------------------ +// 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; +} |