1 /* 2 * Copyright (C) 2015 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 #ifndef BOOTINFO_H_ 18 #define BOOTINFO_H_ 19 20 #include <stdint.h> 21 #include <stdbool.h> 22 23 typedef struct BrilloSlotInfo { 24 uint8_t bootable : 1; 25 uint8_t reserved[3]; 26 } BrilloSlotInfo; 27 28 typedef struct BrilloBootInfo { 29 // Used by fs_mgr. Must be NUL terminated. 30 char bootctrl_suffix[4]; 31 32 // Magic for identification - must be 'B', 'C', 'c' (short for 33 // "boot_control copy" implementation). 34 uint8_t magic[3]; 35 36 // Version of BrilloBootInfo struct, must be 0 or larger. 37 uint8_t version; 38 39 // Currently active slot. 40 uint8_t active_slot; 41 42 // Information about each slot. 43 BrilloSlotInfo slot_info[2]; 44 45 uint8_t reserved[15]; 46 } BrilloBootInfo; 47 48 // Loading and saving BrillBootInfo instances. 49 bool boot_info_load(BrilloBootInfo *out_info); 50 bool boot_info_save(BrilloBootInfo *info); 51 52 // Returns non-zero if valid. 53 bool boot_info_validate(BrilloBootInfo* info); 54 void boot_info_reset(BrilloBootInfo* info); 55 56 // Opens partition by |name|, e.g. "misc" or "boot_a" with |flags| 57 // (e.g. O_RDONLY or O_RDWR) passed directly to open(2). Returns fd on 58 // success and -1 on error. 59 int boot_info_open_partition(const char *name, uint64_t *out_size, int flags); 60 61 #if defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 6 62 _Static_assert(sizeof(BrilloBootInfo) == 32, "BrilloBootInfo has wrong size"); 63 #endif 64 65 #endif // BOOTINFO_H 66