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/** @file
This file defines the EFI RAM Disk Protocol.
Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Revision Reference:
This Protocol is introduced in UEFI Specification 2.6
**/
#ifndef __RAM_DISK_PROTOCOL_H__
#define __RAM_DISK_PROTOCOL_H__
//
// EFI RAM Disk Protocol GUID value
//
#define EFI_RAM_DISK_PROTOCOL_GUID \
{ 0xab38a0df, 0x6873, 0x44a9, { 0x87, 0xe6, 0xd4, 0xeb, 0x56, 0x14, 0x84, 0x49 }};
//
// Forward reference for pure ANSI compatability
//
typedef struct _EFI_RAM_DISK_PROTOCOL EFI_RAM_DISK_PROTOCOL;
/**
Register a RAM disk with specified address, size and type.
@param[in] RamDiskBase The base address of registered RAM disk.
@param[in] RamDiskSize The size of registered RAM disk.
@param[in] RamDiskType The type of registered RAM disk. The GUID can be
any of the values defined in section 9.3.6.9, or a
vendor defined GUID.
@param[in] ParentDevicePath
Pointer to the parent device path. If there is no
parent device path then ParentDevicePath is NULL.
@param[out] DevicePath On return, points to a pointer to the device path
of the RAM disk device.
If ParentDevicePath is not NULL, the returned
DevicePath is created by appending a RAM disk node
to the parent device path. If ParentDevicePath is
NULL, the returned DevicePath is a RAM disk device
path without appending. This function is
responsible for allocating the buffer DevicePath
with the boot service AllocatePool().
@retval EFI_SUCCESS The RAM disk is registered successfully.
@retval EFI_INVALID_PARAMETER DevicePath or RamDiskType is NULL.
RamDiskSize is 0.
@retval EFI_ALREADY_STARTED A Device Path Protocol instance to be created
is already present in the handle database.
@retval EFI_OUT_OF_RESOURCES The RAM disk register operation fails due to
resource limitation.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_RAM_DISK_REGISTER_RAMDISK)(
IN UINT64 RamDiskBase,
IN UINT64 RamDiskSize,
IN EFI_GUID *RamDiskType,
IN EFI_DEVICE_PATH *ParentDevicePath OPTIONAL,
OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath
);
/**
Unregister a RAM disk specified by DevicePath.
@param[in] DevicePath A pointer to the device path that describes a RAM
Disk device.
@retval EFI_SUCCESS The RAM disk is unregistered successfully.
@retval EFI_INVALID_PARAMETER DevicePath is NULL.
@retval EFI_UNSUPPORTED The device specified by DevicePath is not a
valid ramdisk device path and not supported
by the driver.
@retval EFI_NOT_FOUND The RAM disk pointed by DevicePath doesn't
exist.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_RAM_DISK_UNREGISTER_RAMDISK)(
IN EFI_DEVICE_PATH_PROTOCOL *DevicePath
);
///
/// RAM Disk Protocol structure.
///
struct _EFI_RAM_DISK_PROTOCOL {
EFI_RAM_DISK_REGISTER_RAMDISK Register;
EFI_RAM_DISK_UNREGISTER_RAMDISK Unregister;
};
///
/// RAM Disk Protocol GUID variable.
///
extern EFI_GUID gEfiRamDiskProtocolGuid;
#endif
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