[mirror_edk2.git] / ArmPkg / Library / ArmDmaLib / ArmDmaLib.c

/** @file\r
  Generic ARM implementation of DmaLib.h\r
\r
  Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r
  \r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <PiDxe.h>\r
#include <Library/DebugLib.h>\r
#include <Library/DmaLib.h>\r
#include <Library/DxeServicesTableLib.h>\r
#include <Library/MemoryAllocationLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/UncachedMemoryAllocationLib.h>\r
#include <Library/IoLib.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/ArmLib.h>\r
\r
#include <Protocol/Cpu.h>\r
\r
typedef struct {\r
  EFI_PHYSICAL_ADDRESS      HostAddress;\r
  EFI_PHYSICAL_ADDRESS      DeviceAddress;\r
  UINTN                     NumberOfBytes;\r
  DMA_MAP_OPERATION         Operation;\r
  BOOLEAN                   DoubleBuffer;\r
} MAP_INFO_INSTANCE;\r
\r
\r
\r
EFI_CPU_ARCH_PROTOCOL      *gCpu;\r
UINTN                      gCacheAlignment = 0;\r
\r
/**                                                                 \r
  Provides the DMA controller-specific addresses needed to access system memory.\r
  \r
  Operation is relative to the DMA bus master.\r
            \r
  @param  Operation             Indicates if the bus master is going to read or write to system memory.\r
  @param  HostAddress           The system memory address to map to the DMA controller.\r
  @param  NumberOfBytes         On input the number of bytes to map. On output the number of bytes\r
                                that were mapped.                                                 \r
  @param  DeviceAddress         The resulting map address for the bus master controller to use to\r
                                access the hosts HostAddress.                                        \r
  @param  Mapping               A resulting value to pass to Unmap().\r
                                  \r
  @retval EFI_SUCCESS           The range was mapped for the returned NumberOfBytes.\r
  @retval EFI_UNSUPPORTED       The HostAddress cannot be mapped as a common buffer.                                \r
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r
  @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack of resources.\r
  @retval EFI_DEVICE_ERROR      The system hardware could not map the requested address.\r
                                   \r
**/\r
EFI_STATUS\r
EFIAPI\r
DmaMap (\r
  IN     DMA_MAP_OPERATION              Operation,\r
  IN     VOID                           *HostAddress,\r
  IN OUT UINTN                          *NumberOfBytes,\r
  OUT    PHYSICAL_ADDRESS               *DeviceAddress,\r
  OUT    VOID                           **Mapping\r
  )\r
{\r
  EFI_STATUS                      Status;\r
  MAP_INFO_INSTANCE               *Map;\r
  VOID                            *Buffer;\r
  EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;\r
\r
  if (HostAddress == NULL || NumberOfBytes == NULL || DeviceAddress == NULL || Mapping == NULL ) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  if (Operation >= MapOperationMaximum) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  *DeviceAddress = ConvertToPhysicalAddress (HostAddress);\r
\r
  // Remember range so we can flush on the other side\r
  Map = AllocatePool (sizeof (MAP_INFO_INSTANCE));\r
  if (Map == NULL) {\r
    return  EFI_OUT_OF_RESOURCES;\r
  }\r
  \r
  *Mapping = Map;\r
\r
  if ((((UINTN)HostAddress & (gCacheAlignment - 1)) != 0) ||\r
      ((*NumberOfBytes % gCacheAlignment) != 0)) {\r
\r
    // Get the cacheability of the region\r
    Status = gDS->GetMemorySpaceDescriptor (*DeviceAddress, &GcdDescriptor);\r
    if (EFI_ERROR(Status)) {\r
      return Status;\r
    }\r
\r
    // If the mapped buffer is not an uncached buffer\r
    if (GcdDescriptor.Attributes != EFI_MEMORY_UC) {\r
      //\r
      // If the buffer does not fill entire cache lines we must double buffer into\r
      // uncached memory. Device (PCI) address becomes uncached page.\r
      //\r
      Map->DoubleBuffer  = TRUE;\r
      Status = DmaAllocateBuffer (EfiBootServicesData, EFI_SIZE_TO_PAGES (*NumberOfBytes), &Buffer);\r
      if (EFI_ERROR (Status)) {\r
        return Status;\r
      }\r
\r
      if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {\r
        CopyMem (Buffer, HostAddress, *NumberOfBytes);\r
      }\r
\r
      *DeviceAddress = (PHYSICAL_ADDRESS)(UINTN)Buffer;\r
    } else {\r
      Map->DoubleBuffer  = FALSE;\r
    }\r
  } else {\r
    Map->DoubleBuffer  = FALSE;\r
\r
    // Flush the Data Cache (should not have any effect if the memory region is uncached)\r
    gCpu->FlushDataCache (gCpu, *DeviceAddress, *NumberOfBytes, EfiCpuFlushTypeWriteBackInvalidate);\r
\r
    if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {\r
      // In case the buffer is used for instance to send command to a PCI controller, we must ensure the memory is uncached\r
      Status = gDS->SetMemorySpaceAttributes (ALIGN_VALUE(*DeviceAddress - BASE_4KB - 1,BASE_4KB), ALIGN_VALUE(*NumberOfBytes,BASE_4KB), EFI_MEMORY_UC);\r
      ASSERT_EFI_ERROR (Status);\r
    }\r
  }\r
\r
  Map->HostAddress   = (UINTN)HostAddress;\r
  Map->DeviceAddress = *DeviceAddress;\r
  Map->NumberOfBytes = *NumberOfBytes;\r
  Map->Operation     = Operation;\r
\r
  return EFI_SUCCESS;\r
}\r
\r
\r
/**                                                                 \r
  Completes the DmaMapBusMasterRead(), DmaMapBusMasterWrite(), or DmaMapBusMasterCommonBuffer()\r
  operation and releases any corresponding resources.\r
            \r
  @param  Mapping               The mapping value returned from DmaMap*().\r
                                  \r
  @retval EFI_SUCCESS           The range was unmapped.\r
  @retval EFI_DEVICE_ERROR      The data was not committed to the target system memory.\r
                                   \r
**/\r
EFI_STATUS\r
EFIAPI\r
DmaUnmap (\r
  IN  VOID                         *Mapping\r
  )\r
{\r
  MAP_INFO_INSTANCE *Map;\r
  \r
  if (Mapping == NULL) {\r
    ASSERT (FALSE);\r
    return EFI_INVALID_PARAMETER;\r
  }\r
  \r
  Map = (MAP_INFO_INSTANCE *)Mapping;\r
  \r
  if (Map->DoubleBuffer) {\r
    if ((Map->Operation == MapOperationBusMasterWrite) || (Map->Operation == MapOperationBusMasterCommonBuffer)) {\r
      CopyMem ((VOID *)(UINTN)Map->HostAddress, (VOID *)(UINTN)Map->DeviceAddress, Map->NumberOfBytes);\r
    }\r
    \r
    DmaFreeBuffer (EFI_SIZE_TO_PAGES (Map->NumberOfBytes), (VOID *)(UINTN)Map->DeviceAddress);\r
  \r
  } else {\r
    if (Map->Operation == MapOperationBusMasterWrite) {\r
      //\r
      // Make sure we read buffer from uncached memory and not the cache\r
      //\r
      gCpu->FlushDataCache (gCpu, Map->HostAddress, Map->NumberOfBytes, EfiCpuFlushTypeInvalidate);\r
    }\r
  }\r
  \r
  FreePool (Map);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**                                                                 \r
  Allocates pages that are suitable for an DmaMap() of type MapOperationBusMasterCommonBuffer.\r
  mapping.                                                                       \r
            \r
  @param  MemoryType            The type of memory to allocate, EfiBootServicesData or\r
                                EfiRuntimeServicesData.                               \r
  @param  Pages                 The number of pages to allocate.                                \r
  @param  HostAddress           A pointer to store the base system memory address of the\r
                                allocated range.                                        \r
\r
                                @retval EFI_SUCCESS           The requested memory pages were allocated.\r
  @retval EFI_UNSUPPORTED       Attributes is unsupported. The only legal attribute bits are\r
                                MEMORY_WRITE_COMBINE and MEMORY_CACHED.                     \r
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r
  @retval EFI_OUT_OF_RESOURCES  The memory pages could not be allocated.  \r
                                   \r
**/\r
EFI_STATUS\r
EFIAPI\r
DmaAllocateBuffer (\r
  IN  EFI_MEMORY_TYPE              MemoryType,\r
  IN  UINTN                        Pages,\r
  OUT VOID                         **HostAddress\r
  )\r
{\r
  if (HostAddress == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  //\r
  // The only valid memory types are EfiBootServicesData and EfiRuntimeServicesData\r
  //\r
  // We used uncached memory to keep coherency\r
  //\r
  if (MemoryType == EfiBootServicesData) {\r
    *HostAddress = UncachedAllocatePages (Pages);\r
  } else if (MemoryType == EfiRuntimeServicesData) {\r
    *HostAddress = UncachedAllocateRuntimePages (Pages);\r
  } else {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
\r
/**                                                                 \r
  Frees memory that was allocated with DmaAllocateBuffer().\r
            \r
  @param  Pages                 The number of pages to free.                                \r
  @param  HostAddress           The base system memory address of the allocated range.                                    \r
                                  \r
  @retval EFI_SUCCESS           The requested memory pages were freed.\r
  @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages\r
                                was not allocated with DmaAllocateBuffer().\r
                                     \r
**/\r
EFI_STATUS\r
EFIAPI\r
DmaFreeBuffer (\r
  IN  UINTN                        Pages,\r
  IN  VOID                         *HostAddress\r
  )\r
{\r
  if (HostAddress == NULL) {\r
     return EFI_INVALID_PARAMETER;\r
  } \r
  \r
  UncachedFreePages (HostAddress, Pages);\r
  return EFI_SUCCESS;\r
}\r
\r
\r
EFI_STATUS\r
EFIAPI\r
ArmDmaLibConstructor (\r
  IN EFI_HANDLE       ImageHandle,\r
  IN EFI_SYSTEM_TABLE *SystemTable\r
  )\r
{\r
  EFI_STATUS              Status;\r
\r
  // Get the Cpu protocol for later use\r
  Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&gCpu);\r
  ASSERT_EFI_ERROR(Status);\r
\r
  gCacheAlignment = ArmDataCacheLineLength ();\r
  \r
  return Status;\r
}\r
\r
Commit	Line	Data
938f46b4	1	/** @file\r
	2	Generic ARM implementation of DmaLib.h\r
	3	\r
	4	Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r
	5	\r
	6	This program and the accompanying materials\r
	7	are licensed and made available under the terms and conditions of the BSD License\r
	8	which accompanies this distribution. The full text of the license may be found at\r
	9	http://opensource.org/licenses/bsd-license.php\r
	10	\r
	11	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	12	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	13	\r
	14	**/\r
	15	\r
e6d572ba	16	#include <PiDxe.h>\r
938f46b4	17	#include <Library/DebugLib.h>\r
938f46b4	18	#include <Library/DmaLib.h>\r
e6d572ba	19	#include <Library/DxeServicesTableLib.h>\r
938f46b4	20	#include <Library/MemoryAllocationLib.h>\r
	21	#include <Library/UefiBootServicesTableLib.h>\r
	22	#include <Library/UncachedMemoryAllocationLib.h>\r
	23	#include <Library/IoLib.h>\r
	24	#include <Library/BaseMemoryLib.h>\r
	25	#include <Library/ArmLib.h>\r
	26	\r
	27	#include <Protocol/Cpu.h>\r
	28	\r
	29	typedef struct {\r
	30	EFI_PHYSICAL_ADDRESS HostAddress;\r
	31	EFI_PHYSICAL_ADDRESS DeviceAddress;\r
	32	UINTN NumberOfBytes;\r
	33	DMA_MAP_OPERATION Operation;\r
	34	BOOLEAN DoubleBuffer;\r
	35	} MAP_INFO_INSTANCE;\r
	36	\r
	37	\r
	38	\r
	39	EFI_CPU_ARCH_PROTOCOL *gCpu;\r
	40	UINTN gCacheAlignment = 0;\r
	41	\r
938f46b4	42	/** \r
	43	Provides the DMA controller-specific addresses needed to access system memory.\r
	44	\r
	45	Operation is relative to the DMA bus master.\r
	46	\r
	47	@param Operation Indicates if the bus master is going to read or write to system memory.\r
	48	@param HostAddress The system memory address to map to the DMA controller.\r
	49	@param NumberOfBytes On input the number of bytes to map. On output the number of bytes\r
	50	that were mapped. \r
	51	@param DeviceAddress The resulting map address for the bus master controller to use to\r
	52	access the hosts HostAddress. \r
	53	@param Mapping A resulting value to pass to Unmap().\r
	54	\r
	55	@retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.\r
	56	@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer. \r
	57	@retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r
	58	@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.\r
	59	@retval EFI_DEVICE_ERROR The system hardware could not map the requested address.\r
	60	\r
	61	**/\r
	62	EFI_STATUS\r
	63	EFIAPI\r
	64	DmaMap (\r
	65	IN DMA_MAP_OPERATION Operation,\r
	66	IN VOID *HostAddress,\r
	67	IN OUT UINTN *NumberOfBytes,\r
	68	OUT PHYSICAL_ADDRESS *DeviceAddress,\r
	69	OUT VOID **Mapping\r
	70	)\r
	71	{\r
e6d572ba	72	EFI_STATUS Status;\r
	73	MAP_INFO_INSTANCE *Map;\r
	74	VOID *Buffer;\r
	75	EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;\r
938f46b4	76	\r
e6d572ba	77	if (HostAddress == NULL \|\| NumberOfBytes == NULL \|\| DeviceAddress == NULL \|\| Mapping == NULL ) {\r
938f46b4	78	return EFI_INVALID_PARAMETER;\r
938f46b4	79	}\r
938f46b4	80	\r
	81	if (Operation >= MapOperationMaximum) {\r
	82	return EFI_INVALID_PARAMETER;\r
	83	}\r
	84	\r
	85	*DeviceAddress = ConvertToPhysicalAddress (HostAddress);\r
	86	\r
	87	// Remember range so we can flush on the other side\r
	88	Map = AllocatePool (sizeof (MAP_INFO_INSTANCE));\r
	89	if (Map == NULL) {\r
	90	return EFI_OUT_OF_RESOURCES;\r
	91	}\r
	92	\r
	93	*Mapping = Map;\r
	94	\r
3ea3ff88	95	if ((((UINTN)HostAddress & (gCacheAlignment - 1)) != 0) \|\|\r
3ea3ff88	96	((*NumberOfBytes % gCacheAlignment) != 0)) {\r
e6d572ba	97	\r
e6d572ba	98	// Get the cacheability of the region\r
151acec6	99	Status = gDS->GetMemorySpaceDescriptor (*DeviceAddress, &GcdDescriptor);\r
e6d572ba	100	if (EFI_ERROR(Status)) {\r
938f46b4	101	return Status;\r
938f46b4	102	}\r
e6d572ba	103	\r
	104	// If the mapped buffer is not an uncached buffer\r
	105	if (GcdDescriptor.Attributes != EFI_MEMORY_UC) {\r
	106	//\r
	107	// If the buffer does not fill entire cache lines we must double buffer into\r
	108	// uncached memory. Device (PCI) address becomes uncached page.\r
	109	//\r
	110	Map->DoubleBuffer = TRUE;\r
	111	Status = DmaAllocateBuffer (EfiBootServicesData, EFI_SIZE_TO_PAGES (*NumberOfBytes), &Buffer);\r
	112	if (EFI_ERROR (Status)) {\r
	113	return Status;\r
	114	}\r
	115	\r
	116	if ((Operation == MapOperationBusMasterRead) \|\| (Operation == MapOperationBusMasterCommonBuffer)) {\r
	117	CopyMem (Buffer, HostAddress, *NumberOfBytes);\r
	118	}\r
	119	\r
	120	*DeviceAddress = (PHYSICAL_ADDRESS)(UINTN)Buffer;\r
	121	} else {\r
	122	Map->DoubleBuffer = FALSE;\r
	123	}\r
938f46b4	124	} else {\r
938f46b4	125	Map->DoubleBuffer = FALSE;\r
e6d572ba	126	\r
	127	// Flush the Data Cache (should not have any effect if the memory region is uncached)\r
	128	gCpu->FlushDataCache (gCpu, DeviceAddress, NumberOfBytes, EfiCpuFlushTypeWriteBackInvalidate);\r
	129	\r
	130	if ((Operation == MapOperationBusMasterRead) \|\| (Operation == MapOperationBusMasterCommonBuffer)) {\r
	131	// In case the buffer is used for instance to send command to a PCI controller, we must ensure the memory is uncached\r
	132	Status = gDS->SetMemorySpaceAttributes (ALIGN_VALUE(DeviceAddress - BASE_4KB - 1,BASE_4KB), ALIGN_VALUE(NumberOfBytes,BASE_4KB), EFI_MEMORY_UC);\r
	133	ASSERT_EFI_ERROR (Status);\r
	134	}\r
938f46b4	135	}\r
938f46b4	136	\r
938f46b4	137	Map->HostAddress = (UINTN)HostAddress;\r
	138	Map->DeviceAddress = *DeviceAddress;\r
	139	Map->NumberOfBytes = *NumberOfBytes;\r
	140	Map->Operation = Operation;\r
	141	\r
938f46b4	142	return EFI_SUCCESS;\r
	143	}\r
	144	\r
	145	\r
	146	/** \r
	147	Completes the DmaMapBusMasterRead(), DmaMapBusMasterWrite(), or DmaMapBusMasterCommonBuffer()\r
	148	operation and releases any corresponding resources.\r
	149	\r
	150	@param Mapping The mapping value returned from DmaMap*().\r
	151	\r
	152	@retval EFI_SUCCESS The range was unmapped.\r
	153	@retval EFI_DEVICE_ERROR The data was not committed to the target system memory.\r
	154	\r
	155	**/\r
	156	EFI_STATUS\r
	157	EFIAPI\r
	158	DmaUnmap (\r
	159	IN VOID *Mapping\r
	160	)\r
	161	{\r
	162	MAP_INFO_INSTANCE *Map;\r
	163	\r
	164	if (Mapping == NULL) {\r
	165	ASSERT (FALSE);\r
	166	return EFI_INVALID_PARAMETER;\r
	167	}\r
	168	\r
	169	Map = (MAP_INFO_INSTANCE *)Mapping;\r
	170	\r
	171	if (Map->DoubleBuffer) {\r
e6d572ba	172	if ((Map->Operation == MapOperationBusMasterWrite) \|\| (Map->Operation == MapOperationBusMasterCommonBuffer)) {\r
938f46b4	173	CopyMem ((VOID )(UINTN)Map->HostAddress, (VOID )(UINTN)Map->DeviceAddress, Map->NumberOfBytes);\r
	174	}\r
	175	\r
	176	DmaFreeBuffer (EFI_SIZE_TO_PAGES (Map->NumberOfBytes), (VOID *)(UINTN)Map->DeviceAddress);\r
	177	\r
	178	} else {\r
	179	if (Map->Operation == MapOperationBusMasterWrite) {\r
	180	//\r
	181	// Make sure we read buffer from uncached memory and not the cache\r
	182	//\r
	183	gCpu->FlushDataCache (gCpu, Map->HostAddress, Map->NumberOfBytes, EfiCpuFlushTypeInvalidate);\r
	184	}\r
	185	}\r
	186	\r
	187	FreePool (Map);\r
	188	\r
	189	return EFI_SUCCESS;\r
	190	}\r
	191	\r
	192	/** \r
	193	Allocates pages that are suitable for an DmaMap() of type MapOperationBusMasterCommonBuffer.\r
	194	mapping. \r
	195	\r
	196	@param MemoryType The type of memory to allocate, EfiBootServicesData or\r
	197	EfiRuntimeServicesData. \r
	198	@param Pages The number of pages to allocate. \r
	199	@param HostAddress A pointer to store the base system memory address of the\r
	200	allocated range. \r
	201	\r
	202	@retval EFI_SUCCESS The requested memory pages were allocated.\r
	203	@retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are\r
	204	MEMORY_WRITE_COMBINE and MEMORY_CACHED. \r
	205	@retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r
	206	@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated. \r
	207	\r
	208	**/\r
	209	EFI_STATUS\r
	210	EFIAPI\r
	211	DmaAllocateBuffer (\r
	212	IN EFI_MEMORY_TYPE MemoryType,\r
	213	IN UINTN Pages,\r
	214	OUT VOID **HostAddress\r
	215	)\r
	216	{\r
	217	if (HostAddress == NULL) {\r
	218	return EFI_INVALID_PARAMETER;\r
	219	}\r
	220	\r
	221	//\r
	222	// The only valid memory types are EfiBootServicesData and EfiRuntimeServicesData\r
	223	//\r
	224	// We used uncached memory to keep coherency\r
	225	//\r
	226	if (MemoryType == EfiBootServicesData) {\r
	227	*HostAddress = UncachedAllocatePages (Pages);\r
1bfda055	228	} else if (MemoryType == EfiRuntimeServicesData) {\r
938f46b4	229	*HostAddress = UncachedAllocateRuntimePages (Pages);\r
	230	} else {\r
	231	return EFI_INVALID_PARAMETER;\r
	232	}\r
	233	\r
	234	return EFI_SUCCESS;\r
	235	}\r
	236	\r
	237	\r
	238	/** \r
	239	Frees memory that was allocated with DmaAllocateBuffer().\r
	240	\r
	241	@param Pages The number of pages to free. \r
	242	@param HostAddress The base system memory address of the allocated range. \r
	243	\r
	244	@retval EFI_SUCCESS The requested memory pages were freed.\r
	245	@retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages\r
	246	was not allocated with DmaAllocateBuffer().\r
	247	\r
	248	**/\r
	249	EFI_STATUS\r
	250	EFIAPI\r
	251	DmaFreeBuffer (\r
	252	IN UINTN Pages,\r
	253	IN VOID *HostAddress\r
	254	)\r
	255	{\r
	256	if (HostAddress == NULL) {\r
	257	return EFI_INVALID_PARAMETER;\r
	258	} \r
	259	\r
	260	UncachedFreePages (HostAddress, Pages);\r
	261	return EFI_SUCCESS;\r
	262	}\r
	263	\r
	264	\r
	265	EFI_STATUS\r
	266	EFIAPI\r
	267	ArmDmaLibConstructor (\r
	268	IN EFI_HANDLE ImageHandle,\r
	269	IN EFI_SYSTEM_TABLE *SystemTable\r
	270	)\r
	271	{\r
	272	EFI_STATUS Status;\r
	273	\r
	274	// Get the Cpu protocol for later use\r
	275	Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&gCpu);\r
	276	ASSERT_EFI_ERROR(Status);\r
	277	\r
	278	gCacheAlignment = ArmDataCacheLineLength ();\r
	279	\r
	280	return Status;\r
	281	}\r
	282	\r