blob: aa439a7e1efd5508b599df06332741fb89d1512b
| 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person |
| 5 | * obtaining a copy of this software and associated documentation |
| 6 | * files (the "Software"), to deal in the Software without |
| 7 | * restriction, including without limitation the rights to use, copy, |
| 8 | * modify, merge, publish, distribute, sublicense, and/or sell copies |
| 9 | * of the Software, and to permit persons to whom the Software is |
| 10 | * furnished to do so, subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be |
| 13 | * included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 16 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 17 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 18 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 19 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 20 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 21 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
| 24 | #define LOG_TAG "control_avb" |
| 25 | |
| 26 | #include <log/log.h> |
| 27 | |
| 28 | #include <errno.h> |
| 29 | #include <string.h> |
| 30 | |
| 31 | #include <cutils/properties.h> |
| 32 | #include <hardware/boot_control.h> |
| 33 | #include <hardware/hardware.h> |
| 34 | |
| 35 | #include <libavb_user/libavb_user.h> |
| 36 | |
| 37 | static AvbOps* ops = NULL; |
| 38 | |
| 39 | static void module_init(boot_control_module_t* module) { |
| 40 | if (ops != NULL) { |
| 41 | return; |
| 42 | } |
| 43 | |
| 44 | ops = avb_ops_user_new(); |
| 45 | if (ops == NULL) { |
| 46 | ALOGE("Unable to allocate AvbOps instance.\n"); |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | static unsigned int module_getNumberSlots(boot_control_module_t* module) { |
| 51 | return 2; |
| 52 | } |
| 53 | |
| 54 | static unsigned int module_getCurrentSlot(boot_control_module_t* module) { |
| 55 | char propbuf[PROPERTY_VALUE_MAX]; |
| 56 | |
| 57 | property_get("ro.boot.slot_suffix", propbuf, ""); |
| 58 | |
| 59 | ALOGE("module_getCurrentSlot slot suffix: %s", propbuf); |
| 60 | |
| 61 | if (strcmp(propbuf, "_a") == 0) { |
| 62 | return 0; |
| 63 | } else if (strcmp(propbuf, "_b") == 0) { |
| 64 | return 1; |
| 65 | } else { |
| 66 | ALOGE("Unexpected slot suffix: %s", propbuf); |
| 67 | return 0; |
| 68 | } |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static int module_markBootSuccessful(boot_control_module_t* module) { |
| 73 | AvbIOResult ret; |
| 74 | ret = avb_ab_mark_slot_successful(ops->ab_ops, module_getCurrentSlot(module)); |
| 75 | if (ret == AVB_IO_RESULT_OK) { |
| 76 | return 0; |
| 77 | } else if (ret == AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION) { |
| 78 | return -1; |
| 79 | } else { |
| 80 | return -EIO; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | static int module_setActiveBootSlot(boot_control_module_t* module, |
| 85 | unsigned int slot) { |
| 86 | if (avb_ab_mark_slot_active(ops->ab_ops, slot) == AVB_IO_RESULT_OK) { |
| 87 | return 0; |
| 88 | } else { |
| 89 | return -EIO; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static int module_setSlotAsUnbootable(struct boot_control_module* module, |
| 94 | unsigned int slot) { |
| 95 | if (avb_ab_mark_slot_unbootable(ops->ab_ops, slot) == AVB_IO_RESULT_OK) { |
| 96 | return 0; |
| 97 | } else { |
| 98 | return -EIO; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | static int module_isSlotBootable(struct boot_control_module* module, |
| 103 | unsigned int slot) { |
| 104 | AvbABData ab_data; |
| 105 | bool is_bootable; |
| 106 | if (slot >= 2) { |
| 107 | return -1; |
| 108 | } |
| 109 | |
| 110 | if (avb_ab_data_read(ops->ab_ops, &ab_data) != AVB_IO_RESULT_OK) { |
| 111 | return -EIO; |
| 112 | } |
| 113 | |
| 114 | is_bootable = (ab_data.slots[slot].priority > 0) && |
| 115 | (ab_data.slots[slot].successful_boot || |
| 116 | (ab_data.slots[slot].tries_remaining > 0)); |
| 117 | |
| 118 | return is_bootable ? 1 : 0; |
| 119 | } |
| 120 | |
| 121 | static int module_isSlotMarkedSuccessful(struct boot_control_module* module, |
| 122 | unsigned int slot) { |
| 123 | AvbABData ab_data; |
| 124 | bool is_marked_successful; |
| 125 | if (slot >= 2) { |
| 126 | return -1; |
| 127 | } |
| 128 | |
| 129 | if (avb_ab_data_read(ops->ab_ops, &ab_data) != AVB_IO_RESULT_OK) { |
| 130 | return -EIO; |
| 131 | } |
| 132 | |
| 133 | is_marked_successful = ab_data.slots[slot].successful_boot; |
| 134 | |
| 135 | return is_marked_successful ? 1 : 0; |
| 136 | } |
| 137 | |
| 138 | static const char* module_getSuffix(boot_control_module_t* module, |
| 139 | unsigned int slot) { |
| 140 | static const char* suffix[2] = {"_a", "_b"}; |
| 141 | if (slot >= 2) { |
| 142 | return NULL; |
| 143 | } |
| 144 | return suffix[slot]; |
| 145 | } |
| 146 | |
| 147 | static struct hw_module_methods_t module_methods = { |
| 148 | .open = NULL, |
| 149 | }; |
| 150 | |
| 151 | boot_control_module_t HAL_MODULE_INFO_SYM = { |
| 152 | .common = |
| 153 | { |
| 154 | .tag = HARDWARE_MODULE_TAG, |
| 155 | .module_api_version = BOOT_CONTROL_MODULE_API_VERSION_0_1, |
| 156 | .hal_api_version = HARDWARE_HAL_API_VERSION, |
| 157 | .id = BOOT_CONTROL_HARDWARE_MODULE_ID, |
| 158 | .name = "AVB implementation of boot_control HAL", |
| 159 | .author = "The Android Open Source Project", |
| 160 | .methods = &module_methods, |
| 161 | }, |
| 162 | .init = module_init, |
| 163 | .getNumberSlots = module_getNumberSlots, |
| 164 | .getCurrentSlot = module_getCurrentSlot, |
| 165 | .markBootSuccessful = module_markBootSuccessful, |
| 166 | .setActiveBootSlot = module_setActiveBootSlot, |
| 167 | .setSlotAsUnbootable = module_setSlotAsUnbootable, |
| 168 | .isSlotBootable = module_isSlotBootable, |
| 169 | .getSuffix = module_getSuffix, |
| 170 | .isSlotMarkedSuccessful = module_isSlotMarkedSuccessful, |
| 171 | }; |
| 172 |