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-rw-r--r--twbootloader.cpp213
1 files changed, 213 insertions, 0 deletions
diff --git a/twbootloader.cpp b/twbootloader.cpp
new file mode 100644
index 000000000..d0e49e0cd
--- /dev/null
+++ b/twbootloader.cpp
@@ -0,0 +1,213 @@
+/*
+ * 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"
+extern "C" {
+#include "mtdutils/mtdutils.h"
+}
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "partitions.hpp"
+
+static int get_bootloader_message_mtd(struct bootloader_message *out, const TWPartition* Partition);
+static int set_bootloader_message_mtd(const struct bootloader_message *in, const TWPartition* Partition);
+static int get_bootloader_message_block(struct bootloader_message *out, const TWPartition* Partition);
+static int set_bootloader_message_block(const struct bootloader_message *in, const TWPartition* Partition);
+
+int get_bootloader_message(struct bootloader_message *out) {
+ TWPartition* Part = PartitionManager.Find_Partition_By_Path("/misc");
+ if (Part == NULL) {
+ //LOGE("Cannot load volume /misc!\n");
+ return -1;
+ }
+
+ if (Part->Current_File_System == "mtd")
+ return get_bootloader_message_mtd(out, Part);
+ else if (Part->Current_File_System == "emmc")
+ return get_bootloader_message_block(out, Part);
+
+ LOGE("unknown misc partition fs_type \"%s\"\n", Part->Current_File_System.c_str());
+ return -1;
+}
+
+int set_bootloader_message(const struct bootloader_message *in) {
+ TWPartition* Part = PartitionManager.Find_Partition_By_Path("/misc");
+ if (Part == NULL) {
+ //LOGE("Cannot load volume /misc!\n");
+ return -1;
+ }
+
+ if (Part->Current_File_System == "mtd")
+ return set_bootloader_message_mtd(in, Part);
+ else if (Part->Current_File_System == "emmc")
+ return set_bootloader_message_block(in, Part);
+
+ LOGE("unknown misc partition fs_type \"%s\"\n", Part->Current_File_System.c_str());
+ 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 TWPartition* Partition) {
+ size_t write_size;
+ mtd_scan_partitions();
+ const MtdPartition *part = mtd_find_partition_by_name(Partition->MTD_Name.c_str());
+ if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
+ LOGE("Can't find %s\n", Partition->MTD_Name.c_str());
+ return -1;
+ }
+
+ MtdReadContext *read = mtd_read_partition(part);
+ if (read == NULL) {
+ LOGE("Can't open %s\n(%s)\n", Partition->MTD_Name.c_str(), 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", Partition->MTD_Name.c_str(), 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 TWPartition* Partition) {
+ size_t write_size;
+ mtd_scan_partitions();
+ const MtdPartition *part = mtd_find_partition_by_name(Partition->MTD_Name.c_str());
+ if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
+ LOGE("Can't find %s\n", Partition->MTD_Name.c_str());
+ return -1;
+ }
+
+ MtdReadContext *read = mtd_read_partition(part);
+ if (read == NULL) {
+ LOGE("Can't open %s\n(%s)\n", Partition->MTD_Name.c_str(), 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", Partition->MTD_Name.c_str(), 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", Partition->MTD_Name.c_str(), strerror(errno));
+ return -1;
+ }
+ if (mtd_write_data(write, data, size) != size) {
+ LOGE("Can't write %s\n(%s)\n", Partition->MTD_Name.c_str(), strerror(errno));
+ mtd_write_close(write);
+ return -1;
+ }
+ if (mtd_write_close(write)) {
+ LOGE("Can't finish %s\n(%s)\n", Partition->MTD_Name.c_str(), 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 TWPartition* Partition) {
+ wait_for_device(Partition->Actual_Block_Device.c_str());
+
+ FILE* f = fopen(Partition->Actual_Block_Device.c_str(), "rb");
+ if (f == NULL) {
+ LOGE("Can't open %s\n(%s)\n", Partition->Actual_Block_Device.c_str(), 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", Partition->Actual_Block_Device.c_str(), strerror(errno));
+ return -1;
+ }
+
+ if (fclose(f) != 0) {
+ LOGE("Failed closing %s\n(%s)\n", Partition->Actual_Block_Device.c_str(), strerror(errno));
+ return -1;
+ }
+
+ memcpy(out, &temp, sizeof(temp));
+ return 0;
+}
+
+static int set_bootloader_message_block(const struct bootloader_message *in,
+ const TWPartition* Partition) {
+ wait_for_device(Partition->Actual_Block_Device.c_str());
+
+ FILE* f = fopen(Partition->Actual_Block_Device.c_str(), "wb");
+ if (f == NULL) {
+ LOGE("Can't open %s\n(%s)\n", Partition->Actual_Block_Device.c_str(), strerror(errno));
+ return -1;
+ }
+
+ int count = fwrite(in, sizeof(*in), 1, f);
+ if (count != 1) {
+ LOGE("Failed writing %s\n(%s)\n", Partition->Actual_Block_Device.c_str(), strerror(errno));
+ return -1;
+ }
+
+ if (fclose(f) != 0) {
+ LOGE("Failed closing %s\n(%s)\n", Partition->Actual_Block_Device.c_str(), strerror(errno));
+ return -1;
+ }
+ return 0;
+}
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