mbr.h

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/*
 * Copyright (C) 2020 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.
 */
#pragma once
 
#include <stdint.h>
 
namespace cuttlefish {
 
inline constexpr int kSectorSizeShift = 9;
inline constexpr int kSectorSize = 1 << kSectorSizeShift;
 
struct __attribute__((packed)) MbrPartitionEntry {
  uint8_t status;
  uint8_t begin_chs[3];
  uint8_t partition_type;
  uint8_t end_chs[3];
  uint32_t first_lba;
  uint32_t num_sectors;
};
 
struct __attribute__((packed)) MasterBootRecord {
  uint8_t bootstrap_code[446];
  MbrPartitionEntry partitions[4];
  uint8_t boot_signature[2];
};
 
static_assert(sizeof(MasterBootRecord) == kSectorSize);
 
MasterBootRecord ProtectiveMbr(uint64_t size);
 
}  // namespace cuttlefish