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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 "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) {
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)) {
LOGE("Can't write %s image\n(%s)\n", update_type, strerror(errno));
format_volume("/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);
if (set_bootloader_message(&boot)) {
format_volume("/cache");
return -1;
}
reboot(RB_AUTOBOOT);
// Can't reboot? WTF?
LOGE("Can't reboot\n");
return -1;
}
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