8e9da4ba3c
In order to support PEI graphic, we let VTdPmrPei driver parse DMAR table RMRR entry and allow the UMA access. If a system has no PEI IGD, no RMRR is needed. The behavior is unchanged. If a system has PEI IGD, it must report RMRR in PEI phase. The PeiVTdPrm will program the IGD VTd engine to skip the RMRR region, and program the rest PCI VTd engine to skip the another DMA buffer allocated in PEI phase for other device driver. Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/** @file
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The definition for DMA access Library.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef __DMA_ACCESS_LIB_H__
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#define __DMA_ACCESS_LIB_H__
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typedef struct {
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UINT8 HostAddressWidth;
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UINTN VTdEngineCount;
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UINT64 VTdEngineAddress[1];
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} VTD_INFO;
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/**
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Set DMA protected region.
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@param EngineMask The mask of the VTd engine to be accessed.
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@param LowMemoryBase The protected low memory region base.
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@param LowMemoryLength The protected low memory region length.
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@param HighMemoryBase The protected high memory region base.
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@param HighMemoryLength The protected high memory region length.
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@retval EFI_SUCCESS The DMA protection is set.
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@retval EFI_UNSUPPORTED The DMA protection is not set.
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**/
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EFI_STATUS
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SetDmaProtectedRange (
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IN UINT64 EngineMask,
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IN UINT32 LowMemoryBase,
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IN UINT32 LowMemoryLength,
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IN UINT64 HighMemoryBase,
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IN UINT64 HighMemoryLength
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);
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/**
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Diable DMA protection.
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@param EngineMask The mask of the VTd engine to be accessed.
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@retval DMA protection is disabled.
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**/
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EFI_STATUS
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DisableDmaProtection (
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IN UINT64 EngineMask
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);
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/**
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Get protected low memory alignment.
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@param EngineMask The mask of the VTd engine to be accessed.
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@return protected low memory alignment.
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**/
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UINT32
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GetLowMemoryAlignment (
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IN UINT64 EngineMask
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);
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/**
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Get protected high memory alignment.
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@param EngineMask The mask of the VTd engine to be accessed.
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@return protected high memory alignment.
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**/
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UINT64
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GetHighMemoryAlignment (
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IN UINT64 EngineMask
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);
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#endif
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