zircon/kernel/lib/efi/include/efi/protocol/device-path.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_DEVICE_PATH_H_
#define ZIRCON_KERNEL_LIB_EFI_INCLUDE_EFI_PROTOCOL_DEVICE_PATH_H_

#include <efi/types.h>

#define EFI_DEVICE_PATH_PROTOCOL_GUID                                              \
  {                                                                                \
    0x09576e91, 0x6d3f, 0x11d2, { 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
  }
extern efi_guid DevicePathProtocol;

typedef struct efi_device_path_protocol {
  uint8_t Type;
  uint8_t SubType;
  uint8_t Length[2];
} efi_device_path_protocol;

#define DEVICE_PATH_HARDWARE 0x01
#define DEVICE_PATH_ACPI 0x02
#define DEVICE_PATH_MESSAGING 0x03
#define DEVICE_PATH_MEDIA 0x04
#define DEVICE_PATH_BIOS_BOOT_SPEC 0x05
#define DEVICE_PATH_END 0x7f

#define DEVICE_PATH_INSTANCE_END 0x01
#define DEVICE_PATH_ENTIRE_END 0xff

#define DEVICE_PATH_HW_PCI 0x01
#define DEVICE_PATH_HW_PCCARD 0x02
#define DEVICE_PATH_HW_MEMMAP 0x03
#define DEVICE_PATH_HW_VENDOR 0x04
#define DEVICE_PATH_HW_CONTROLLER 0x05
#define DEVICE_PATH_HW_BMC 0x06

// TODO: sub-types for other types (ACPI, etc)

// TODO: move this to another header? would break circular dependencies between
// boot-services.h and this header, for efi_memory_type
typedef struct {
  efi_device_path_protocol Header;
  efi_memory_type MemoryType;
  efi_physical_addr StartAddress;
  efi_physical_addr EndAddress;
} efi_device_path_hw_memmap;

#endif  // ZIRCON_KERNEL_LIB_EFI_INCLUDE_EFI_PROTOCOL_DEVICE_PATH_H_