DmaMem.c File Reference

#include "EhcPeim.h"

Go to the source code of this file.

Functions
EFI_STATUS	IoMmuMap (IN EDKII_IOMMU_PPI *IoMmu, IN EDKII_IOMMU_OPERATION Operation, IN VOID *HostAddress, IN OUT UINTN *NumberOfBytes, OUT EFI_PHYSICAL_ADDRESS *DeviceAddress, OUT VOID **Mapping)
VOID	IoMmuUnmap (IN EDKII_IOMMU_PPI *IoMmu, IN VOID *Mapping)
EFI_STATUS	IoMmuAllocateBuffer (IN EDKII_IOMMU_PPI *IoMmu, IN UINTN Pages, OUT VOID **HostAddress, OUT EFI_PHYSICAL_ADDRESS *DeviceAddress, OUT VOID **Mapping)
VOID	IoMmuFreeBuffer (IN EDKII_IOMMU_PPI *IoMmu, IN UINTN Pages, IN VOID *HostAddress, IN VOID *Mapping)
VOID	IoMmuInit (OUT EDKII_IOMMU_PPI **IoMmu)

Detailed Description

The DMA memory help functions.

Copyright (c) 2017, Intel Corporation. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file DmaMem.c.

Function Documentation

IoMmuAllocateBuffer()

EFI_STATUS IoMmuAllocateBuffer	(	IN EDKII_IOMMU_PPI *	IoMmu,
		IN UINTN	Pages,
		OUT VOID **	HostAddress,
		OUT EFI_PHYSICAL_ADDRESS *	DeviceAddress,
		OUT VOID **	Mapping
	)

Allocates pages that are suitable for an OperationBusMasterCommonBuffer or OperationBusMasterCommonBuffer64 mapping.

Parameters

IoMmu	Pointer to IOMMU PPI.
Pages	The number of pages to allocate.
HostAddress	A pointer to store the base system memory address of the allocated range.
DeviceAddress	The resulting map address for the bus master PCI controller to use to access the hosts HostAddress.
Mapping	A resulting value to pass to Unmap().

Return values

EFI_SUCCESS	The requested memory pages were allocated.
EFI_UNSUPPORTED	Attributes is unsupported. The only legal attribute bits are MEMORY_WRITE_COMBINE and MEMORY_CACHED.
EFI_INVALID_PARAMETER	One or more parameters are invalid.
EFI_OUT_OF_RESOURCES	The memory pages could not be allocated.

Definition at line 134 of file DmaMem.c.

IoMmuFreeBuffer()

VOID IoMmuFreeBuffer	(	IN EDKII_IOMMU_PPI *	IoMmu,
		IN UINTN	Pages,
		IN VOID *	HostAddress,
		IN VOID *	Mapping
	)

Frees memory that was allocated with AllocateBuffer().

Parameters

IoMmu	Pointer to IOMMU PPI.
Pages	The number of pages to free.
HostAddress	The base system memory address of the allocated range.
Mapping	The mapping value returned from Map().

Definition at line 217 of file DmaMem.c.

IoMmuInit()

VOID IoMmuInit

(

OUT EDKII_IOMMU_PPI **

IoMmu

)

Initialize IOMMU.

Parameters

IoMmu

Pointer to pointer to IOMMU PPI.

Definition at line 238 of file DmaMem.c.

IoMmuMap()

EFI_STATUS IoMmuMap	(	IN EDKII_IOMMU_PPI *	IoMmu,
		IN EDKII_IOMMU_OPERATION	Operation,
		IN VOID *	HostAddress,
		IN OUT UINTN *	NumberOfBytes,
		OUT EFI_PHYSICAL_ADDRESS *	DeviceAddress,
		OUT VOID **	Mapping
	)

Provides the controller-specific addresses required to access system memory from a DMA bus master.

Parameters

IoMmu	Pointer to IOMMU PPI.
Operation	Indicates if the bus master is going to read or write to system memory.
HostAddress	The system memory address to map to the PCI controller.
NumberOfBytes	On input the number of bytes to map. On output the number of bytes that were mapped.
DeviceAddress	The resulting map address for the bus master PCI controller to use to access the hosts HostAddress.
Mapping	A resulting value to pass to Unmap().

Return values

EFI_SUCCESS	The range was mapped for the returned NumberOfBytes.
EFI_UNSUPPORTED	The HostAddress cannot be mapped as a common buffer.
EFI_INVALID_PARAMETER	One or more parameters are invalid.
EFI_OUT_OF_RESOURCES	The request could not be completed due to a lack of resources.
EFI_DEVICE_ERROR	The system hardware could not map the requested address.

Definition at line 33 of file DmaMem.c.

IoMmuUnmap()

VOID IoMmuUnmap	(	IN EDKII_IOMMU_PPI *	IoMmu,
		IN VOID *	Mapping
	)

Completes the Map() operation and releases any corresponding resources.

Parameters

IoMmu	Pointer to IOMMU PPI.
Mapping	The mapping value returned from Map().

Definition at line 103 of file DmaMem.c.