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The Android Open Source Projectc24a8e62009-03-03 19:28:42 -08001/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "bootloader.h"
18#include "common.h"
19#include "mtdutils/mtdutils.h"
20#include "roots.h"
21
22#include <errno.h>
23#include <stdio.h>
24#include <string.h>
25
Doug Zongkerd4208f92010-09-20 12:16:13 -070026static int get_bootloader_message_mtd(struct bootloader_message *out, const Volume* v);
27static int set_bootloader_message_mtd(const struct bootloader_message *in, const Volume* v);
28static int get_bootloader_message_block(struct bootloader_message *out, const Volume* v);
29static int set_bootloader_message_block(const struct bootloader_message *in, const Volume* v);
30
31int get_bootloader_message(struct bootloader_message *out) {
32 Volume* v = volume_for_path("/misc");
33 if (strcmp(v->fs_type, "mtd") == 0) {
34 return get_bootloader_message_mtd(out, v);
Doug Zongker93ca4fc2010-09-21 14:28:11 -070035 } else if (strcmp(v->fs_type, "emmc") == 0) {
Doug Zongkerd4208f92010-09-20 12:16:13 -070036 return get_bootloader_message_block(out, v);
37 }
38 LOGE("unknown misc partition fs_type \"%s\"\n", v->fs_type);
39 return -1;
40}
41
42int set_bootloader_message(const struct bootloader_message *in) {
43 Volume* v = volume_for_path("/misc");
44 if (strcmp(v->fs_type, "mtd") == 0) {
45 return set_bootloader_message_mtd(in, v);
Doug Zongker93ca4fc2010-09-21 14:28:11 -070046 } else if (strcmp(v->fs_type, "emmc") == 0) {
Doug Zongkerd4208f92010-09-20 12:16:13 -070047 return set_bootloader_message_block(in, v);
48 }
49 LOGE("unknown misc partition fs_type \"%s\"\n", v->fs_type);
50 return -1;
51}
52
53// ------------------------------
54// for misc partitions on MTD
55// ------------------------------
56
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080057static const int MISC_PAGES = 3; // number of pages to save
58static const int MISC_COMMAND_PAGE = 1; // bootloader command is this page
59
Doug Zongkerd4208f92010-09-20 12:16:13 -070060static int get_bootloader_message_mtd(struct bootloader_message *out,
61 const Volume* v) {
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080062 size_t write_size;
Doug Zongkerd4208f92010-09-20 12:16:13 -070063 mtd_scan_partitions();
64 const MtdPartition *part = mtd_find_partition_by_name(v->device);
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080065 if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
Doug Zongkerd4208f92010-09-20 12:16:13 -070066 LOGE("Can't find %s\n", v->device);
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080067 return -1;
68 }
69
70 MtdReadContext *read = mtd_read_partition(part);
71 if (read == NULL) {
Doug Zongkerd4208f92010-09-20 12:16:13 -070072 LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080073 return -1;
74 }
75
76 const ssize_t size = write_size * MISC_PAGES;
77 char data[size];
78 ssize_t r = mtd_read_data(read, data, size);
Doug Zongkerd4208f92010-09-20 12:16:13 -070079 if (r != size) LOGE("Can't read %s\n(%s)\n", v->device, strerror(errno));
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080080 mtd_read_close(read);
81 if (r != size) return -1;
82
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080083 memcpy(out, &data[write_size * MISC_COMMAND_PAGE], sizeof(*out));
84 return 0;
85}
Doug Zongkerd4208f92010-09-20 12:16:13 -070086static int set_bootloader_message_mtd(const struct bootloader_message *in,
87 const Volume* v) {
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080088 size_t write_size;
Doug Zongkerd4208f92010-09-20 12:16:13 -070089 mtd_scan_partitions();
90 const MtdPartition *part = mtd_find_partition_by_name(v->device);
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080091 if (part == NULL || mtd_partition_info(part, NULL, NULL, &write_size)) {
Doug Zongkerd4208f92010-09-20 12:16:13 -070092 LOGE("Can't find %s\n", v->device);
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080093 return -1;
94 }
95
96 MtdReadContext *read = mtd_read_partition(part);
97 if (read == NULL) {
Doug Zongkerd4208f92010-09-20 12:16:13 -070098 LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080099 return -1;
100 }
101
102 ssize_t size = write_size * MISC_PAGES;
103 char data[size];
104 ssize_t r = mtd_read_data(read, data, size);
Doug Zongkerd4208f92010-09-20 12:16:13 -0700105 if (r != size) LOGE("Can't read %s\n(%s)\n", v->device, strerror(errno));
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -0800106 mtd_read_close(read);
107 if (r != size) return -1;
108
109 memcpy(&data[write_size * MISC_COMMAND_PAGE], in, sizeof(*in));
110
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -0800111 MtdWriteContext *write = mtd_write_partition(part);
112 if (write == NULL) {
Doug Zongkerd4208f92010-09-20 12:16:13 -0700113 LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -0800114 return -1;
115 }
116 if (mtd_write_data(write, data, size) != size) {
Doug Zongkerd4208f92010-09-20 12:16:13 -0700117 LOGE("Can't write %s\n(%s)\n", v->device, strerror(errno));
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -0800118 mtd_write_close(write);
119 return -1;
120 }
121 if (mtd_write_close(write)) {
Doug Zongkerd4208f92010-09-20 12:16:13 -0700122 LOGE("Can't finish %s\n(%s)\n", v->device, strerror(errno));
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -0800123 return -1;
124 }
125
126 LOGI("Set boot command \"%s\"\n", in->command[0] != 255 ? in->command : "");
127 return 0;
128}
Doug Zongkerd4208f92010-09-20 12:16:13 -0700129
130
131// ------------------------------------
132// for misc partitions on block devices
133// ------------------------------------
134
135static int get_bootloader_message_block(struct bootloader_message *out,
136 const Volume* v) {
137 FILE* f = fopen(v->device, "rb");
138 if (f == NULL) {
139 LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
140 return -1;
141 }
142 struct bootloader_message temp;
143 int count = fread(&temp, sizeof(temp), 1, f);
144 if (count != 1) {
145 LOGE("Failed reading %s\n(%s)\n", v->device, strerror(errno));
146 return -1;
147 }
148 if (fclose(f) != 0) {
149 LOGE("Failed closing %s\n(%s)\n", v->device, strerror(errno));
150 return -1;
151 }
152 memcpy(out, &temp, sizeof(temp));
153 return 0;
154}
155
156static int set_bootloader_message_block(const struct bootloader_message *in,
157 const Volume* v) {
158 FILE* f = fopen(v->device, "wb");
159 if (f == NULL) {
160 LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
161 return -1;
162 }
163 int count = fwrite(in, sizeof(*in), 1, f);
164 if (count != 1) {
165 LOGE("Failed writing %s\n(%s)\n", v->device, strerror(errno));
166 return -1;
167 }
168 if (fclose(f) != 0) {
169 LOGE("Failed closing %s\n(%s)\n", v->device, strerror(errno));
170 return -1;
171 }
172 return 0;
173}