| /* |
| * 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 "firmware.h" |
| #include "roots.h" |
| |
| #include <errno.h> |
| #include <string.h> |
| #include <sys/reboot.h> |
| |
| static const char *update_type = NULL; |
| static const char *update_data = NULL; |
| static int update_length = 0; |
| |
| int remember_firmware_update(const char *type, const char *data, int length) { |
| if (update_type != NULL || update_data != NULL) { |
| LOGE("Multiple firmware images\n"); |
| return -1; |
| } |
| |
| update_type = type; |
| update_data = data; |
| update_length = length; |
| return 0; |
| } |
| |
| // Return true if there is a firmware update pending. |
| int firmware_update_pending() { |
| return update_data != NULL && update_length > 0; |
| } |
| |
| /* Bootloader / Recovery Flow |
| * |
| * On every boot, the bootloader will read the bootloader_message |
| * from flash and check the command field. The bootloader should |
| * deal with the command field not having a 0 terminator correctly |
| * (so as to not crash if the block is invalid or corrupt). |
| * |
| * The bootloader will have to publish the partition that contains |
| * the bootloader_message to the linux kernel so it can update it. |
| * |
| * if command == "boot-recovery" -> boot recovery.img |
| * else if command == "update-radio" -> update radio image (below) |
| * else if command == "update-hboot" -> update hboot image (below) |
| * else -> boot boot.img (normal boot) |
| * |
| * Radio/Hboot Update Flow |
| * 1. the bootloader will attempt to load and validate the header |
| * 2. if the header is invalid, status="invalid-update", goto #8 |
| * 3. display the busy image on-screen |
| * 4. if the update image is invalid, status="invalid-radio-image", goto #8 |
| * 5. attempt to update the firmware (depending on the command) |
| * 6. if successful, status="okay", goto #8 |
| * 7. if failed, and the old image can still boot, status="failed-update" |
| * 8. write the bootloader_message, leaving the recovery field |
| * unchanged, updating status, and setting command to |
| * "boot-recovery" |
| * 9. reboot |
| * |
| * The bootloader will not modify or erase the cache partition. |
| * It is recovery's responsibility to clean up the mess afterwards. |
| */ |
| |
| int maybe_install_firmware_update(const char *send_intent, |
| const char *log_filename) { |
| if (update_data == NULL || update_length == 0) return 0; |
| |
| /* We destroy the cache partition to pass the update image to the |
| * bootloader, so all we can really do afterwards is wipe cache and reboot. |
| * Set up this instruction now, in case we're interrupted while writing. |
| */ |
| |
| struct bootloader_message boot; |
| memset(&boot, 0, sizeof(boot)); |
| strlcpy(boot.command, "boot-recovery", sizeof(boot.command)); |
| strlcpy(boot.recovery, "recovery\n--wipe_cache\n", sizeof(boot.command)); |
| if (send_intent != NULL) { |
| strlcat(boot.recovery, "--send_intent=", sizeof(boot.recovery)); |
| strlcat(boot.recovery, send_intent, sizeof(boot.recovery)); |
| strlcat(boot.recovery, "\n", sizeof(boot.recovery)); |
| } |
| if (set_bootloader_message(&boot)) return -1; |
| |
| int width = 0, height = 0, bpp = 0; |
| char *busy_image = ui_copy_image( |
| BACKGROUND_ICON_FIRMWARE_INSTALLING, &width, &height, &bpp); |
| char *fail_image = ui_copy_image( |
| BACKGROUND_ICON_FIRMWARE_ERROR, &width, &height, &bpp); |
| |
| ui_print("Writing %s image...\n", update_type); |
| if (write_update_for_bootloader( |
| update_data, update_length, |
| width, height, bpp, busy_image, fail_image, log_filename)) { |
| LOGE("Can't write %s image\n(%s)\n", update_type, strerror(errno)); |
| format_root_device("CACHE:"); // Attempt to clean cache up, at least. |
| return -1; |
| } |
| |
| free(busy_image); |
| free(fail_image); |
| |
| /* The update image is fully written, so now we can instruct the bootloader |
| * to install it. (After doing so, it will come back here, and we will |
| * wipe the cache and reboot into the system.) |
| */ |
| snprintf(boot.command, sizeof(boot.command), "update-%s", update_type); |
| strlcat(boot.recovery, "--recover_log\n", sizeof(boot.recovery)); |
| if (set_bootloader_message(&boot)) { |
| format_root_device("CACHE:"); |
| return -1; |
| } |
| |
| reboot(RB_AUTOBOOT); |
| |
| // Can't reboot? WTF? |
| LOGE("Can't reboot\n"); |
| return -1; |
| } |