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      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