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/** @file
The definition for DMA access Library.
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#ifndef __DMA_ACCESS_LIB_H__
#define __DMA_ACCESS_LIB_H__
typedef struct {
UINT8 HostAddressWidth;
UINTN VTdEngineCount;
UINT64 VTdEngineAddress[1];
} VTD_INFO;
/**
Set DMA protected region.
@param EngineMask The mask of the VTd engine to be accessed.
@param LowMemoryBase The protected low memory region base.
@param LowMemoryLength The protected low memory region length.
@param HighMemoryBase The protected high memory region base.
@param HighMemoryLength The protected high memory region length.
@retval EFI_SUCCESS The DMA protection is set.
@retval EFI_UNSUPPORTED The DMA protection is not set.
**/
EFI_STATUS
SetDmaProtectedRange (
IN UINT64 EngineMask,
IN UINT32 LowMemoryBase,
IN UINT32 LowMemoryLength,
IN UINT64 HighMemoryBase,
IN UINT64 HighMemoryLength
);
/**
Diable DMA protection.
@param EngineMask The mask of the VTd engine to be accessed.
@retval DMA protection is disabled.
**/
EFI_STATUS
DisableDmaProtection (
IN UINT64 EngineMask
);
/**
Get protected low memory alignment.
@param EngineMask The mask of the VTd engine to be accessed.
@return protected low memory alignment.
**/
UINT32
GetLowMemoryAlignment (
IN UINT64 EngineMask
);
/**
Get protected high memory alignment.
@param EngineMask The mask of the VTd engine to be accessed.
@return protected high memory alignment.
**/
UINT64
GetHighMemoryAlignment (
IN UINT64 EngineMask
);
#endif
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