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