zircon/kernel/lib/efi/include/efi/protocol/block-io.h

// Copyright 2016 The Fuchsia Authors
//
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT

#ifndef ZIRCON_KERNEL_LIB_EFI_INCLUDE_EFI_PROTOCOL_BLOCK_IO_H_
#define ZIRCON_KERNEL_LIB_EFI_INCLUDE_EFI_PROTOCOL_BLOCK_IO_H_

#include <efi/boot-services.h>
#include <efi/runtime-services.h>
#include <efi/types.h>

#define EFI_BLOCK_IO_PROTOCOL_GUID                                                 \
  {                                                                                \
    0x964e5b21, 0x6459, 0x11d2, { 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
  }

extern efi_guid BlockIoProtocol;

#define EFI_BLOCK_IO_PROTOCOL_REVISION2 0x00020001
#define EFI_BLOCK_IO_PROTOCOL_REVISION3 0x00020031

typedef struct efi_block_io_media efi_block_io_media;
typedef struct efi_block_io_protocol efi_block_io_protocol;

struct efi_block_io_protocol {
  uint64_t Revision;
  efi_block_io_media* Media;
  efi_status (*Reset)(efi_block_io_protocol* self, bool ExtendedVerification) EFIAPI;
  efi_status (*ReadBlocks)(efi_block_io_protocol* self, uint32_t MediaId, uint64_t LBA,
                           uint64_t BufferSize, void* Buffer) EFIAPI;
  efi_status (*WriteBlocks)(efi_block_io_protocol* self, uint32_t MediaId, uint64_t LBA,
                            uint64_t BufferSize, const void* Buffer) EFIAPI;
  efi_status (*FlushBlocks)(efi_block_io_protocol* self);
};

struct efi_block_io_media {
  // present in rev1
  uint32_t MediaId;
  bool RemovableMedia;
  bool MediaPresent;
  bool LogicalPartition;
  bool ReadOnly;
  bool WriteCaching;
  uint32_t BlockSize;
  uint32_t IoAlign;
  uint64_t LastBlock;

  // present in rev2
  uint64_t LowestAlignedLba;
  uint32_t LogicalBlocksPerPhysicalBlock;

  // present in rev3
  uint32_t OptimalTransferLengthGranularity;
};

#endif  // ZIRCON_KERNEL_LIB_EFI_INCLUDE_EFI_PROTOCOL_BLOCK_IO_H_