bootloader.cpp - platform/bootable/recovery - Git at Google

 /*
  * 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 <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>

 #include <fs_mgr.h>

 #include "bootloader.h"
 #include "common.h"
 #include "mtdutils/mtdutils.h"
 #include "roots.h"
 #include "unique_fd.h"

 static int get_bootloader_message_mtd(bootloader_message* out, const Volume* v);
 static int set_bootloader_message_mtd(const bootloader_message* in, const Volume* v);
 static int get_bootloader_message_block(bootloader_message* out, const Volume* v);
 static int set_bootloader_message_block(const bootloader_message* in, const Volume* v);

 int get_bootloader_message(bootloader_message* out) {
     Volume* v = volume_for_path("/misc");
     if (v == nullptr) {
         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 bootloader_message* in) {
     Volume* v = volume_for_path("/misc");
     if (v == nullptr) {
         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(bootloader_message* out,
                                       const Volume* v) {
     size_t write_size;
     mtd_scan_partitions();
     const MtdPartition* part = mtd_find_partition_by_name(v->blk_device);
     if (part == nullptr || mtd_partition_info(part, nullptr, nullptr, &write_size)) {
         LOGE("failed to find \"%s\"\n", v->blk_device);
         return -1;
     }

     MtdReadContext* read = mtd_read_partition(part);
     if (read == nullptr) {
         LOGE("failed to open \"%s\": %s\n", v->blk_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("failed to read \"%s\": %s\n", v->blk_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 bootloader_message* in,
                                       const Volume* v) {
     size_t write_size;
     mtd_scan_partitions();
     const MtdPartition* part = mtd_find_partition_by_name(v->blk_device);
     if (part == nullptr || mtd_partition_info(part, nullptr, nullptr, &write_size)) {
         LOGE("failed to find \"%s\"\n", v->blk_device);
         return -1;
     }

     MtdReadContext* read = mtd_read_partition(part);
     if (read == nullptr) {
         LOGE("failed to open \"%s\": %s\n", v->blk_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("failed to read \"%s\": %s\n", v->blk_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 == nullptr) {
         LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
         return -1;
     }
     if (mtd_write_data(write, data, size) != size) {
         LOGE("failed to write \"%s\": %s\n", v->blk_device, strerror(errno));
         mtd_write_close(write);
         return -1;
     }
     if (mtd_write_close(write)) {
         LOGE("failed to finish \"%s\": %s\n", v->blk_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;
     do {
         ++tries;
         struct stat buf;
         ret = stat(fn, &buf);
         if (ret == -1) {
             printf("failed to 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(bootloader_message* out,
                                         const Volume* v) {
     wait_for_device(v->blk_device);
     FILE* f = fopen(v->blk_device, "rb");
     if (f == nullptr) {
         LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
         return -1;
     }
     bootloader_message temp;
     int count = fread(&temp, sizeof(temp), 1, f);
     if (count != 1) {
         LOGE("failed to read \"%s\": %s\n", v->blk_device, strerror(errno));
         return -1;
     }
     if (fclose(f) != 0) {
         LOGE("failed to close \"%s\": %s\n", v->blk_device, strerror(errno));
         return -1;
     }
     memcpy(out, &temp, sizeof(temp));
     return 0;
 }

 static int set_bootloader_message_block(const bootloader_message* in,
                                         const Volume* v) {
     wait_for_device(v->blk_device);
     unique_fd fd(open(v->blk_device, O_WRONLY | O_SYNC));
     if (fd.get() == -1) {
         LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
         return -1;
     }

     size_t written = 0;
     const uint8_t* start = reinterpret_cast<const uint8_t*>(in);
     size_t total = sizeof(*in);
     while (written < total) {
         ssize_t wrote = TEMP_FAILURE_RETRY(write(fd.get(), start + written, total - written));
         if (wrote == -1) {
             LOGE("failed to write %" PRId64 " bytes: %s\n",
                  static_cast<off64_t>(written), strerror(errno));
             return -1;
         }
         written += wrote;
     }

     if (fsync(fd.get()) == -1) {
         LOGE("failed to fsync \"%s\": %s\n", v->blk_device, strerror(errno));
         return -1;
     }
     return 0;
 }
	/*
	* 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 <errno.h>
	#include <fcntl.h>
	#include <inttypes.h>
	#include <stdio.h>
	#include <string.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <unistd.h>

	#include <fs_mgr.h>

	#include "bootloader.h"
	#include "common.h"
	#include "mtdutils/mtdutils.h"
	#include "roots.h"
	#include "unique_fd.h"

	static int get_bootloader_message_mtd(bootloader_message* out, const Volume* v);
	static int set_bootloader_message_mtd(const bootloader_message* in, const Volume* v);
	static int get_bootloader_message_block(bootloader_message* out, const Volume* v);
	static int set_bootloader_message_block(const bootloader_message* in, const Volume* v);

	int get_bootloader_message(bootloader_message* out) {
	Volume* v = volume_for_path("/misc");
	if (v == nullptr) {
	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 bootloader_message* in) {
	Volume* v = volume_for_path("/misc");
	if (v == nullptr) {
	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(bootloader_message* out,
	const Volume* v) {
	size_t write_size;
	mtd_scan_partitions();
	const MtdPartition* part = mtd_find_partition_by_name(v->blk_device);
	if (part == nullptr \|\| mtd_partition_info(part, nullptr, nullptr, &write_size)) {
	LOGE("failed to find \"%s\"\n", v->blk_device);
	return -1;
	}

	MtdReadContext* read = mtd_read_partition(part);
	if (read == nullptr) {
	LOGE("failed to open \"%s\": %s\n", v->blk_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("failed to read \"%s\": %s\n", v->blk_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 bootloader_message* in,
	const Volume* v) {
	size_t write_size;
	mtd_scan_partitions();
	const MtdPartition* part = mtd_find_partition_by_name(v->blk_device);
	if (part == nullptr \|\| mtd_partition_info(part, nullptr, nullptr, &write_size)) {
	LOGE("failed to find \"%s\"\n", v->blk_device);
	return -1;
	}

	MtdReadContext* read = mtd_read_partition(part);
	if (read == nullptr) {
	LOGE("failed to open \"%s\": %s\n", v->blk_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("failed to read \"%s\": %s\n", v->blk_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 == nullptr) {
	LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
	return -1;
	}
	if (mtd_write_data(write, data, size) != size) {
	LOGE("failed to write \"%s\": %s\n", v->blk_device, strerror(errno));
	mtd_write_close(write);
	return -1;
	}
	if (mtd_write_close(write)) {
	LOGE("failed to finish \"%s\": %s\n", v->blk_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;
	do {
	++tries;
	struct stat buf;
	ret = stat(fn, &buf);
	if (ret == -1) {
	printf("failed to 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(bootloader_message* out,
	const Volume* v) {
	wait_for_device(v->blk_device);
	FILE* f = fopen(v->blk_device, "rb");
	if (f == nullptr) {
	LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
	return -1;
	}
	bootloader_message temp;
	int count = fread(&temp, sizeof(temp), 1, f);
	if (count != 1) {
	LOGE("failed to read \"%s\": %s\n", v->blk_device, strerror(errno));
	return -1;
	}
	if (fclose(f) != 0) {
	LOGE("failed to close \"%s\": %s\n", v->blk_device, strerror(errno));
	return -1;
	}
	memcpy(out, &temp, sizeof(temp));
	return 0;
	}

	static int set_bootloader_message_block(const bootloader_message* in,
	const Volume* v) {
	wait_for_device(v->blk_device);
	unique_fd fd(open(v->blk_device, O_WRONLY \| O_SYNC));
	if (fd.get() == -1) {
	LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
	return -1;
	}

	size_t written = 0;
	const uint8_t* start = reinterpret_cast<const uint8_t*>(in);
	size_t total = sizeof(*in);
	while (written < total) {
	ssize_t wrote = TEMP_FAILURE_RETRY(write(fd.get(), start + written, total - written));
	if (wrote == -1) {
	LOGE("failed to write %" PRId64 " bytes: %s\n",
	static_cast<off64_t>(written), strerror(errno));
	return -1;
	}
	written += wrote;
	}

	if (fsync(fd.get()) == -1) {
	LOGE("failed to fsync \"%s\": %s\n", v->blk_device, strerror(errno));
	return -1;
	}
	return 0;
	}