From: Brijesh Singh <brijesh.singh@amd.com>
Import DxeBmDmaLib package in OvmfPkg, we need to modify the package to
include SEV support.
The BmDmaLib is proposed by Leo Duran
https://lists.01.org/pipermail/edk2-devel/2017-March/008109.html
NOTE: This patch is still under discussion and have not been accepted
upstream.
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
OvmfPkg/OvmfPkgIa32.dsc | 2 +-
OvmfPkg/OvmfPkgIa32X64.dsc | 2 +-
OvmfPkg/OvmfPkgX64.dsc | 2 +-
OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf | 41 +++
OvmfPkg/Include/Library/BmDmaLib.h | 161 +++++++++
OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.c | 351 ++++++++++++++++++++
6 files changed, 556 insertions(+), 3 deletions(-)
diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 04e7e0fe948f..0475e10e484a 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -91,7 +91,7 @@ [LibraryClasses]
UefiHiiServicesLib|MdeModulePkg/Library/UefiHiiServicesLib/UefiHiiServicesLib.inf
HiiLib|MdeModulePkg/Library/UefiHiiLib/UefiHiiLib.inf
SortLib|MdeModulePkg/Library/UefiSortLib/UefiSortLib.inf
- BmDmaLib|MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
+ BmDmaLib|OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
UefiBootManagerLib|MdeModulePkg/Library/UefiBootManagerLib/UefiBootManagerLib.inf
BootLogoLib|MdeModulePkg/Library/BootLogoLib/BootLogoLib.inf
FileExplorerLib|MdeModulePkg/Library/FileExplorerLib/FileExplorerLib.inf
diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index 882dc8daacc8..408ab37e4a88 100644
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -96,7 +96,7 @@ [LibraryClasses]
UefiHiiServicesLib|MdeModulePkg/Library/UefiHiiServicesLib/UefiHiiServicesLib.inf
HiiLib|MdeModulePkg/Library/UefiHiiLib/UefiHiiLib.inf
SortLib|MdeModulePkg/Library/UefiSortLib/UefiSortLib.inf
- BmDmaLib|MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
+ BmDmaLib|OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
UefiBootManagerLib|MdeModulePkg/Library/UefiBootManagerLib/UefiBootManagerLib.inf
BootLogoLib|MdeModulePkg/Library/BootLogoLib/BootLogoLib.inf
FileExplorerLib|MdeModulePkg/Library/FileExplorerLib/FileExplorerLib.inf
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 3cfd09a3f260..dd3674a5d6dc 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -96,7 +96,7 @@ [LibraryClasses]
UefiHiiServicesLib|MdeModulePkg/Library/UefiHiiServicesLib/UefiHiiServicesLib.inf
HiiLib|MdeModulePkg/Library/UefiHiiLib/UefiHiiLib.inf
SortLib|MdeModulePkg/Library/UefiSortLib/UefiSortLib.inf
- BmDmaLib|MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
+ BmDmaLib|OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
UefiBootManagerLib|MdeModulePkg/Library/UefiBootManagerLib/UefiBootManagerLib.inf
BootLogoLib|MdeModulePkg/Library/BootLogoLib/BootLogoLib.inf
FileExplorerLib|MdeModulePkg/Library/FileExplorerLib/FileExplorerLib.inf
diff --git a/OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf b/OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
new file mode 100644
index 000000000000..4ddb27d578bc
--- /dev/null
+++ b/OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
@@ -0,0 +1,41 @@
+## @file
+#
+# DMA abstraction library APIs. Based on PCI IO protocol DMA abstractions.
+#
+# Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
+# Copyright (c) 2017, AMD Inc. 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.
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = DxeBmDmaLib
+ FILE_GUID = daa403e0-071d-44ef-95cf-7f2472e4a4d5
+ MODULE_TYPE = DXE_DRIVER
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = BmDmaLib|DXE_DRIVER
+
+[Sources.common]
+ DxeBmDmaLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ MdeModulePkg/MdeModulePkg.dec
+
+[LibraryClasses]
+ BaseLib
+ BaseMemoryLib
+ DebugLib
+ DxeServicesTableLib
+ MemoryAllocationLib
+ UefiBootServicesTableLib
+
+
diff --git a/OvmfPkg/Include/Library/BmDmaLib.h b/OvmfPkg/Include/Library/BmDmaLib.h
new file mode 100644
index 000000000000..070340c9cca8
--- /dev/null
+++ b/OvmfPkg/Include/Library/BmDmaLib.h
@@ -0,0 +1,161 @@
+/** @file
+ DMA abstraction library APIs. Based on PCI IO protocol DMA abstractions.
+
+ Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
+ Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
+
+ DMA Bus Master Read Operation:
+ Call BmDmaMap() for DmaOperationBusMasterRead.
+ Program the DMA Bus Master with the DeviceAddress returned by BmDmaMap().
+ Start the DMA Bus Master.
+ Wait for DMA Bus Master to complete the read operation.
+ Call BmDmaUnmap().
+
+ DMA Bus Master Write Operation:
+ Call BmDmaMap() for DmaOperationBusMasterWrite.
+ Program the DMA Bus Master with the DeviceAddress returned by BmDmaMap().
+ Start the DMA Bus Master.
+ Wait for DMA Bus Master to complete the write operation.
+ Call BmDmaUnmap().
+
+ DMA Bus Master Common Buffer Operation:
+ Call BmDmaAllocateBuffer() to allocate a common buffer.
+ Call BmDmaMap() for DmaOperationBusMasterCommonBuffer.
+ Program the DMA Bus Master with the DeviceAddress returned by BmDmaMap().
+ The common buffer can now be accessed equally by the processor and the DMA bus master.
+ Call BmDmaUnmap().
+ Call BmDmaFreeBuffer().
+
+ 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.
+
+ Derived from:
+ EmbeddedPkg/Include/Library/DmaLib.h
+
+**/
+
+#ifndef __BM_DMA_LIB_H__
+#define __BM_DMA_LIB_H__
+
+
+typedef enum {
+ ///
+ /// A read operation from system memory by a bus master.
+ ///
+ DmaOperationBusMasterRead,
+ ///
+ /// A write operation from system memory by a bus master.
+ ///
+ DmaOperationBusMasterWrite,
+ ///
+ /// Provides both read and write access to system memory by both the processor and a
+ /// bus master. The buffer is coherent from both the processor's and the bus master's point of view.
+ ///
+ DmaOperationBusMasterCommonBuffer,
+ DmaOperationBusMasterMaximum
+} BM_DMA_OPERATION;
+
+
+/**
+ Provides the DMA controller-specific addresses needed to access system memory.
+
+ Operation is relative to the DMA bus master.
+
+ @param DmaAbove4GB Indicates capability of DMA operations above 4GB.
+ @param Operation Indicates if the bus master is going to read or write to system memory.
+ @param HostAddress The system memory address to map to the DMA controller.
+ @param NumberOfBytes On input the number of bytes to map. On output the number of bytes
+ that were mapped.
+ @param DeviceAddress The resulting map address for the bus master controller to use to
+ access the hosts HostAddress.
+ @param Mapping A resulting value to pass to BmDmaUnmap().
+
+ @retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
+ @retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
+ @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
+ @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
+ @retval EFI_DEVICE_ERROR The system hardware could not map the requested address.
+
+**/
+EFI_STATUS
+EFIAPI
+BmDmaMap (
+ IN BOOLEAN DmaAbove4GB,
+ IN BM_DMA_OPERATION Operation,
+ IN VOID *HostAddress,
+ IN OUT UINTN *NumberOfBytes,
+ OUT PHYSICAL_ADDRESS *DeviceAddress,
+ OUT VOID **Mapping
+ );
+
+
+/**
+ Completes the DmaOperationBusMasterRead/Write/CommonBuffer operation
+ and releases any corresponding resources.
+
+ @param Mapping The mapping value returned from BmDmaMap().
+
+ @retval EFI_SUCCESS The range was unmapped.
+ @retval EFI_DEVICE_ERROR The data was not committed to the target system memory.
+
+**/
+EFI_STATUS
+EFIAPI
+BmDmaUnmap (
+ IN VOID *Mapping
+ );
+
+
+/**
+ Allocates pages that are suitable for a BmDmaMap() of type DmaOperationBusMasterCommonBuffer.
+
+ @param DmaAbove4GB Indicates capability of DMA operations above 4GB.
+ @param MemoryType The type of memory to allocate: EfiBootServicesData or
+ EfiRuntimeServicesData.
+ @param Pages The number of pages to allocate.
+ @param HostAddress A pointer to store the base system memory address of the
+ allocated range.
+
+ @retval EFI_SUCCESS The requested memory pages were allocated.
+ @retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
+ MEMORY_WRITE_COMBINE and MEMORY_CACHED.
+ @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
+ @retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
+
+**/
+EFI_STATUS
+EFIAPI
+BmDmaAllocateBuffer (
+ IN BOOLEAN DmaAbove4GB,
+ IN EFI_MEMORY_TYPE MemoryType,
+ IN UINTN Pages,
+ OUT VOID **HostAddress
+ );
+
+
+/**
+ Frees memory that was allocated with BmDmaAllocateBuffer().
+
+ @param HostAddress The base system memory address of the allocated range.
+ @param Pages The number of pages to free.
+
+ @retval EFI_SUCCESS The requested memory pages were freed.
+ @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
+ was not allocated with BmDmaAllocateBuffer().
+
+**/
+EFI_STATUS
+EFIAPI
+BmDmaFreeBuffer (
+ IN VOID *HostAddress,
+ IN UINTN Pages
+ );
+
+
+#endif
+
diff --git a/OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.c b/OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.c
new file mode 100644
index 000000000000..4a6a704f9aa5
--- /dev/null
+++ b/OvmfPkg/Library/DxeBmDmaLib/DxeBmDmaLib.c
@@ -0,0 +1,351 @@
+/** @file
+ DMA abstraction library APIs. Based on PCI IO protocol DMA abstractions.
+
+ Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
+ Copyright (c) 2017, AMD Inc. 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.
+
+ Derived from:
+ MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciRootBridgeIo.c
+
+**/
+
+#include <PiDxe.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/BmDmaLib.h>
+
+
+#define FORCE_BELOW_4GB_TRUE TRUE
+#define FORCE_BELOW_4GB_FALSE FALSE
+#define NO_MAPPING (VOID *) (UINTN) -1
+
+
+typedef struct {
+ BM_DMA_OPERATION Operation;
+ UINTN NumberOfBytes;
+ UINTN NumberOfPages;
+ EFI_PHYSICAL_ADDRESS HostAddress;
+ EFI_PHYSICAL_ADDRESS MappedHostAddress;
+} MAP_INFO;
+
+
+EFI_STATUS
+AllocateBounceBuffer (
+ IN BOOLEAN ForceBelow4GB,
+ IN BM_DMA_OPERATION Operation,
+ IN EFI_PHYSICAL_ADDRESS HostAddress,
+ IN OUT UINTN *NumberOfBytes,
+ OUT PHYSICAL_ADDRESS *DeviceAddress,
+ OUT VOID **Mapping
+ )
+{
+ EFI_STATUS Status;
+ MAP_INFO *MapInfo;
+ EFI_ALLOCATE_TYPE AllocateType;
+
+ //
+ // Allocate a MAP_INFO structure to remember the mapping when Unmap() is
+ // called later.
+ //
+ MapInfo = AllocatePool (sizeof (MAP_INFO));
+ if (MapInfo == NULL) {
+ *NumberOfBytes = 0;
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ //
+ // Initialize the MAP_INFO structure
+ //
+ MapInfo->Operation = Operation;
+ MapInfo->NumberOfBytes = *NumberOfBytes;
+ MapInfo->NumberOfPages = EFI_SIZE_TO_PAGES (MapInfo->NumberOfBytes);
+ MapInfo->HostAddress = HostAddress;
+
+ if (ForceBelow4GB) {
+ //
+ // Limit allocations to memory below 4GB
+ //
+ AllocateType = AllocateMaxAddress;
+ MapInfo->MappedHostAddress = SIZE_4GB - 1;
+ } else {
+ AllocateType = AllocateAnyPages;
+ }
+
+ //
+ // Allocate DMA bounce buffer
+ //
+ Status = gBS->AllocatePages (
+ AllocateType,
+ EfiBootServicesData,
+ MapInfo->NumberOfPages,
+ &MapInfo->MappedHostAddress
+ );
+
+ if (EFI_ERROR (Status)) {
+ FreePool (MapInfo);
+ *NumberOfBytes = 0;
+ return Status;
+ }
+
+ //
+ // If this is a read operation from the Bus Master's point of view,
+ // then copy the contents of the real buffer into the mapped buffer
+ // so the Bus Master can read the contents of the real buffer.
+ //
+ if (Operation == DmaOperationBusMasterRead) {
+ CopyMem (
+ (VOID *) (UINTN) MapInfo->MappedHostAddress,
+ (VOID *) (UINTN) MapInfo->HostAddress,
+ MapInfo->NumberOfBytes
+ );
+ }
+
+ //
+ // The DeviceAddress is the address of the mapped buffer
+ //
+ *DeviceAddress = MapInfo->MappedHostAddress;
+
+ //
+ // Return a pointer to the MAP_INFO structure in Mapping
+ //
+ *Mapping = MapInfo;
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Provides the DMA controller-specific addresses needed to access system memory.
+
+ Operation is relative to the DMA bus master.
+
+ @param DmaAbove4GB Indicates capability of DMA operations above 4GB.
+ @param Operation Indicates if the bus master is going to read or write to system memory.
+ @param HostAddress The system memory address to map to the DMA controller.
+ @param NumberOfBytes On input the number of bytes to map. On output the number of bytes
+ that were mapped.
+ @param DeviceAddress The resulting map address for the bus master controller to use to
+ access the hosts HostAddress.
+ @param Mapping A resulting value to pass to BmDmaUnmap().
+
+ @retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
+ @retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
+ @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
+ @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
+ @retval EFI_DEVICE_ERROR The system hardware could not map the requested address.
+
+**/
+EFI_STATUS
+EFIAPI
+BmDmaMap (
+ IN BOOLEAN DmaAbove4GB,
+ IN BM_DMA_OPERATION Operation,
+ IN VOID *HostAddress,
+ IN OUT UINTN *NumberOfBytes,
+ OUT PHYSICAL_ADDRESS *DeviceAddress,
+ OUT VOID **Mapping
+ )
+{
+ EFI_PHYSICAL_ADDRESS PhysicalAddress;
+
+ //
+ // Check for invalid inputs
+ //
+ if (HostAddress == NULL || NumberOfBytes == NULL || DeviceAddress == NULL ||
+ Mapping == NULL || (UINT32) Operation >= DmaOperationBusMasterMaximum) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ PhysicalAddress = (EFI_PHYSICAL_ADDRESS) (UINTN) HostAddress;
+ if (DmaAbove4GB || (PhysicalAddress + *NumberOfBytes) <= SIZE_4GB) {
+ //
+ // If we CAN handle DMA above 4GB or the transfer is below 4GB,
+ // the DeviceAddress is simply the HostAddress
+ //
+ *DeviceAddress = PhysicalAddress;
+ *Mapping = NO_MAPPING;
+
+ return EFI_SUCCESS;
+ }
+
+ //
+ // If we cannot handle DMA above 4GB and any part of the DMA transfer
+ // being is above 4GB, then map the DMA transfer to a buffer below 4GB.
+ //
+ if (Operation == DmaOperationBusMasterCommonBuffer) {
+ //
+ // Common Buffer operations cannot be remapped, so return an error.
+ //
+ return EFI_UNSUPPORTED;
+ }
+
+ return AllocateBounceBuffer (
+ FORCE_BELOW_4GB_TRUE,
+ Operation,
+ PhysicalAddress,
+ NumberOfBytes,
+ DeviceAddress,
+ Mapping
+ );
+}
+
+
+/**
+ Completes the DmaOperationBusMasterRead/Write/CommonBuffer operation
+ and releases any corresponding resources.
+
+ @param Mapping The mapping value returned from BmDmaMap().
+
+ @retval EFI_SUCCESS The range was unmapped.
+ @retval EFI_DEVICE_ERROR The data was not committed to the target system memory.
+
+**/
+EFI_STATUS
+EFIAPI
+BmDmaUnmap (
+ IN VOID *Mapping
+ )
+{
+ MAP_INFO *MapInfo;
+
+ //
+ // Check for invalid inputs
+ //
+ if (Mapping == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // See if the Map() operation associated with this Unmap() required a mapping
+ // buffer. If a mapping buffer was not required, then this function simply
+ // returns EFI_SUCCESS.
+ //
+ if (Mapping == NO_MAPPING) {
+ return EFI_SUCCESS;
+ }
+
+ //
+ // If this is a write operation from the Bus Master's point of view,
+ // then copy the contents of the mapped buffer into the real buffer
+ // so the processor can read the contents of the real buffer.
+ //
+ MapInfo = (MAP_INFO *)Mapping;
+ if (MapInfo->Operation == DmaOperationBusMasterWrite) {
+ CopyMem (
+ (VOID *) (UINTN) MapInfo->HostAddress,
+ (VOID *) (UINTN) MapInfo->MappedHostAddress,
+ MapInfo->NumberOfBytes
+ );
+ }
+
+ //
+ // Free the mapped buffer and the MAP_INFO structure.
+ //
+ gBS->FreePages (MapInfo->MappedHostAddress, MapInfo->NumberOfPages);
+ FreePool (Mapping);
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Allocates pages that are suitable for a BmDmaMap() of type DmaOperationBusMasterCommonBuffer.
+
+ @param DmaAbove4GB Indicates capability of DMA operations above 4GB.
+ @param MemoryType The type of memory to allocate: EfiBootServicesData or
+ EfiRuntimeServicesData.
+ @param Pages The number of pages to allocate.
+ @param HostAddress A pointer to store the base system memory address of the
+ allocated range.
+
+ @retval EFI_SUCCESS The requested memory pages were allocated.
+ @retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
+ MEMORY_WRITE_COMBINE and MEMORY_CACHED.
+ @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
+ @retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
+
+**/
+EFI_STATUS
+EFIAPI
+BmDmaAllocateBuffer (
+ IN BOOLEAN DmaAbove4GB,
+ IN EFI_MEMORY_TYPE MemoryType,
+ IN UINTN Pages,
+ OUT VOID **HostAddress
+ )
+{
+ EFI_STATUS Status;
+ EFI_PHYSICAL_ADDRESS PhysicalAddress;
+ EFI_ALLOCATE_TYPE AllocateType;
+
+ //
+ // Check for invalid inputs
+ //
+ if (HostAddress == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // The only valid memory types are EfiBootServicesData and
+ // EfiRuntimeServicesData
+ //
+ if (MemoryType != EfiBootServicesData &&
+ MemoryType != EfiRuntimeServicesData) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (DmaAbove4GB) {
+ AllocateType = AllocateAnyPages;
+ } else {
+ //
+ // Limit allocations to memory below 4GB
+ //
+ AllocateType = AllocateMaxAddress;
+ PhysicalAddress = (EFI_PHYSICAL_ADDRESS) (SIZE_4GB - 1);
+ }
+ Status = gBS->AllocatePages (
+ AllocateType,
+ MemoryType,
+ Pages,
+ &PhysicalAddress
+ );
+ if (!EFI_ERROR (Status)) {
+ *HostAddress = (VOID *) (UINTN) PhysicalAddress;
+ }
+
+ return Status;
+}
+
+
+/**
+ Frees memory that was allocated with BmDmaAllocateBuffer().
+
+ @param HostAddress The base system memory address of the allocated range.
+ @param Pages The number of pages to free.
+
+ @retval EFI_SUCCESS The requested memory pages were freed.
+ @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
+ was not allocated with BmDmaAllocateBuffer().
+
+**/
+EFI_STATUS
+EFIAPI
+BmDmaFreeBuffer (
+ IN VOID *HostAddress,
+ IN UINTN Pages
+ )
+{
+ return gBS->FreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) HostAddress, Pages);
+}
+
--
2.7.4
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