[mirror_edk2.git] / OvmfPkg / XenPvBlkDxe / BlockIo.c

/** @file\r
  BlockIo implementation for Xen PV Block driver.\r
\r
  This file is implementing the interface between the actual driver in\r
  BlockFront.c to the BlockIo protocol.\r
\r
  Copyright (C) 2014, Citrix Ltd.\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "XenPvBlkDxe.h"\r
\r
#include "BlockFront.h"\r
\r
///\r
/// Block I/O Media structure\r
///\r
GLOBAL_REMOVE_IF_UNREFERENCED\r
EFI_BLOCK_IO_MEDIA  gXenPvBlkDxeBlockIoMedia = {\r
  0,      // MediaId\r
  FALSE,  // RemovableMedia\r
  FALSE,  // MediaPresent\r
  FALSE,  // LogicalPartition\r
  TRUE,   // ReadOnly\r
  FALSE,  // WriteCaching\r
  512,    // BlockSize\r
  512,    // IoAlign, BlockFront does not support less than 512 bits-aligned.\r
  0,      // LastBlock\r
  0,      // LowestAlignedLba\r
  0,      // LogicalBlocksPerPhysicalBlock\r
  0       // OptimalTransferLengthGranularity\r
};\r
\r
///\r
/// Block I/O Protocol instance\r
///\r
GLOBAL_REMOVE_IF_UNREFERENCED\r
EFI_BLOCK_IO_PROTOCOL  gXenPvBlkDxeBlockIo = {\r
  EFI_BLOCK_IO_PROTOCOL_REVISION3,          // Revision\r
  &gXenPvBlkDxeBlockIoMedia,                // Media\r
  XenPvBlkDxeBlockIoReset,                  // Reset\r
  XenPvBlkDxeBlockIoReadBlocks,             // ReadBlocks\r
  XenPvBlkDxeBlockIoWriteBlocks,            // WriteBlocks\r
  XenPvBlkDxeBlockIoFlushBlocks             // FlushBlocks\r
};\r
\r
\r
\r
\r
/**\r
  Read/Write BufferSize bytes from Lba into Buffer.\r
\r
  This function is common to XenPvBlkDxeBlockIoReadBlocks and\r
  XenPvBlkDxeBlockIoWriteBlocks.\r
\r
  @param  This       Indicates a pointer to the calling context.\r
  @param  MediaId    Id of the media, changes every time the media is replaced.\r
  @param  Lba        The starting Logical Block Address to read from/write to.\r
  @param  BufferSize Size of Buffer, must be a multiple of device block size.\r
  @param  Buffer     A pointer to the destination/source buffer for the data.\r
  @param  IsWrite    Indicate if the operation is write or read.\r
\r
  @return See description of XenPvBlkDxeBlockIoReadBlocks and\r
          XenPvBlkDxeBlockIoWriteBlocks.\r
**/\r
STATIC\r
EFI_STATUS\r
XenPvBlkDxeBlockIoReadWriteBlocks (\r
  IN     EFI_BLOCK_IO_PROTOCOL  *This,\r
  IN     UINT32                 MediaId,\r
  IN     EFI_LBA                Lba,\r
  IN     UINTN                  BufferSize,\r
  IN OUT VOID                   *Buffer,\r
  IN     BOOLEAN                IsWrite\r
  )\r
{\r
  XEN_BLOCK_FRONT_IO IoData;\r
  EFI_BLOCK_IO_MEDIA *Media = This->Media;\r
  UINTN Sector;\r
  EFI_STATUS Status;\r
\r
  if (Buffer == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
  if (BufferSize == 0) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  if (BufferSize % Media->BlockSize != 0) {\r
    DEBUG ((EFI_D_ERROR, "XenPvBlkDxe: Bad buffer size: 0x%Lx\n",\r
      (UINT64)BufferSize));\r
    return EFI_BAD_BUFFER_SIZE;\r
  }\r
\r
  if (Lba > Media->LastBlock ||\r
      (BufferSize / Media->BlockSize) - 1 > Media->LastBlock - Lba) {\r
    DEBUG ((EFI_D_ERROR,\r
      "XenPvBlkDxe: %a with invalid LBA: 0x%Lx, size: 0x%Lx\n",\r
      IsWrite ? "Write" : "Read", Lba, (UINT64)BufferSize));\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  if (IsWrite && Media->ReadOnly) {\r
    return EFI_WRITE_PROTECTED;\r
  }\r
\r
  if ((Media->IoAlign > 1) && (UINTN)Buffer & (Media->IoAlign - 1)) {\r
    //\r
    // Grub2 does not appear to respect IoAlign of 512, so reallocate the\r
    // buffer here.\r
    //\r
    VOID *NewBuffer;\r
\r
    //\r
    // Try again with a properly aligned buffer.\r
    //\r
    NewBuffer = AllocateAlignedPages((BufferSize + EFI_PAGE_SIZE) / EFI_PAGE_SIZE,\r
                                     Media->IoAlign);\r
    if (!IsWrite) {\r
      Status = XenPvBlkDxeBlockIoReadBlocks (This, MediaId,\r
                                             Lba, BufferSize, NewBuffer);\r
      CopyMem (Buffer, NewBuffer, BufferSize);\r
    } else {\r
      CopyMem (NewBuffer, Buffer, BufferSize);\r
      Status = XenPvBlkDxeBlockIoWriteBlocks (This, MediaId,\r
                                              Lba, BufferSize, NewBuffer);\r
    }\r
    FreeAlignedPages (NewBuffer, (BufferSize + EFI_PAGE_SIZE) / EFI_PAGE_SIZE);\r
    return Status;\r
  }\r
\r
  IoData.Dev = XEN_BLOCK_FRONT_FROM_BLOCK_IO (This);\r
  Sector = (UINTN)MultU64x32 (Lba, Media->BlockSize / 512);\r
\r
  while (BufferSize > 0) {\r
    if (((UINTN)Buffer & EFI_PAGE_MASK) == 0) {\r
      IoData.Size = MIN (BLKIF_MAX_SEGMENTS_PER_REQUEST * EFI_PAGE_SIZE,\r
                         BufferSize);\r
    } else {\r
      IoData.Size = MIN ((BLKIF_MAX_SEGMENTS_PER_REQUEST - 1) * EFI_PAGE_SIZE,\r
                         BufferSize);\r
    }\r
\r
    IoData.Buffer = Buffer;\r
    IoData.Sector = Sector;\r
    BufferSize -= IoData.Size;\r
    Buffer = (VOID*) ((UINTN) Buffer + IoData.Size);\r
    Sector += IoData.Size / 512;\r
    Status = XenPvBlockIo (&IoData, IsWrite);\r
    if (EFI_ERROR (Status)) {\r
      DEBUG ((EFI_D_ERROR, "XenPvBlkDxe: Error during %a operation.\n",\r
              IsWrite ? "write" : "read"));\r
      return Status;\r
    }\r
  }\r
  return EFI_SUCCESS;\r
}\r
\r
\r
/**\r
  Read BufferSize bytes from Lba into Buffer.\r
\r
  @param  This       Indicates a pointer to the calling context.\r
  @param  MediaId    Id of the media, changes every time the media is replaced.\r
  @param  Lba        The starting Logical Block Address to read from\r
  @param  BufferSize Size of Buffer, must be a multiple of device block size.\r
  @param  Buffer     A pointer to the destination buffer for the data. The caller is\r
                     responsible for either having implicit or explicit ownership of the buffer.\r
\r
  @retval EFI_SUCCESS           The data was read correctly from the device.\r
  @retval EFI_DEVICE_ERROR      The device reported an error while performing the read.\r
  @retval EFI_NO_MEDIA          There is no media in the device.\r
  @retval EFI_MEDIA_CHANGED     The MediaId does not match the current device.\r
  @retval EFI_BAD_BUFFER_SIZE   The Buffer was not a multiple of the block size of the device.\r
  @retval EFI_INVALID_PARAMETER The read request contains LBAs that are not valid,\r
                                or the buffer is not on proper alignment.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
XenPvBlkDxeBlockIoReadBlocks (\r
  IN  EFI_BLOCK_IO_PROTOCOL         *This,\r
  IN  UINT32                        MediaId,\r
  IN  EFI_LBA                       Lba,\r
  IN  UINTN                         BufferSize,\r
  OUT VOID                          *Buffer\r
  )\r
{\r
  return XenPvBlkDxeBlockIoReadWriteBlocks (This,\r
      MediaId, Lba, BufferSize, Buffer, FALSE);\r
}\r
\r
/**\r
  Write BufferSize bytes from Lba into Buffer.\r
\r
  @param  This       Indicates a pointer to the calling context.\r
  @param  MediaId    The media ID that the write request is for.\r
  @param  Lba        The starting logical block address to be written. The caller is\r
                     responsible for writing to only legitimate locations.\r
  @param  BufferSize Size of Buffer, must be a multiple of device block size.\r
  @param  Buffer     A pointer to the source buffer for the data.\r
\r
  @retval EFI_SUCCESS           The data was written correctly to the device.\r
  @retval EFI_WRITE_PROTECTED   The device can not be written to.\r
  @retval EFI_DEVICE_ERROR      The device reported an error while performing the write.\r
  @retval EFI_NO_MEDIA          There is no media in the device.\r
  @retval EFI_MEDIA_CHANGED     The MediaId does not match the current device.\r
  @retval EFI_BAD_BUFFER_SIZE   The Buffer was not a multiple of the block size of the device.\r
  @retval EFI_INVALID_PARAMETER The write request contains LBAs that are not valid,\r
                                or the buffer is not on proper alignment.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
XenPvBlkDxeBlockIoWriteBlocks (\r
  IN EFI_BLOCK_IO_PROTOCOL          *This,\r
  IN UINT32                         MediaId,\r
  IN EFI_LBA                        Lba,\r
  IN UINTN                          BufferSize,\r
  IN VOID                           *Buffer\r
  )\r
{\r
  return XenPvBlkDxeBlockIoReadWriteBlocks (This,\r
      MediaId, Lba, BufferSize, Buffer, TRUE);\r
}\r
\r
/**\r
  Flush the Block Device.\r
\r
  @param  This              Indicates a pointer to the calling context.\r
\r
  @retval EFI_SUCCESS       All outstanding data was written to the device\r
  @retval EFI_DEVICE_ERROR  The device reported an error while writing back the data\r
  @retval EFI_NO_MEDIA      There is no media in the device.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
XenPvBlkDxeBlockIoFlushBlocks (\r
  IN EFI_BLOCK_IO_PROTOCOL  *This\r
  )\r
{\r
  XenPvBlockSync (XEN_BLOCK_FRONT_FROM_BLOCK_IO (This));\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Reset the block device hardware.\r
\r
  @param[in]  This                 Indicates a pointer to the calling context.\r
  @param[in]  ExtendedVerification Not used.\r
\r
  @retval EFI_SUCCESS          The device was reset.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
XenPvBlkDxeBlockIoReset (\r
  IN EFI_BLOCK_IO_PROTOCOL   *This,\r
  IN BOOLEAN                 ExtendedVerification\r
  )\r
{\r
  //\r
  // Since the initialization of the devices is done, then the device is\r
  // working correctly.\r
  //\r
  return EFI_SUCCESS;\r
}\r
Commit	Line	Data
5de8a35c AP	1	/** @file\r
	2	BlockIo implementation for Xen PV Block driver.\r
	3	\r
	4	This file is implementing the interface between the actual driver in\r
	5	BlockFront.c to the BlockIo protocol.\r
	6	\r
	7	Copyright (C) 2014, Citrix Ltd.\r
	8	\r
b26f0cf9	9	SPDX-License-Identifier: BSD-2-Clause-Patent\r
5de8a35c AP	10	\r
	11	**/\r
	12	\r
	13	#include "XenPvBlkDxe.h"\r
	14	\r
	15	#include "BlockFront.h"\r
	16	\r
	17	///\r
	18	/// Block I/O Media structure\r
	19	///\r
	20	GLOBAL_REMOVE_IF_UNREFERENCED\r
	21	EFI_BLOCK_IO_MEDIA gXenPvBlkDxeBlockIoMedia = {\r
	22	0, // MediaId\r
	23	FALSE, // RemovableMedia\r
	24	FALSE, // MediaPresent\r
	25	FALSE, // LogicalPartition\r
	26	TRUE, // ReadOnly\r
	27	FALSE, // WriteCaching\r
	28	512, // BlockSize\r
	29	512, // IoAlign, BlockFront does not support less than 512 bits-aligned.\r
	30	0, // LastBlock\r
	31	0, // LowestAlignedLba\r
	32	0, // LogicalBlocksPerPhysicalBlock\r
	33	0 // OptimalTransferLengthGranularity\r
	34	};\r
	35	\r
	36	///\r
	37	/// Block I/O Protocol instance\r
	38	///\r
	39	GLOBAL_REMOVE_IF_UNREFERENCED\r
	40	EFI_BLOCK_IO_PROTOCOL gXenPvBlkDxeBlockIo = {\r
	41	EFI_BLOCK_IO_PROTOCOL_REVISION3, // Revision\r
	42	&gXenPvBlkDxeBlockIoMedia, // Media\r
	43	XenPvBlkDxeBlockIoReset, // Reset\r
	44	XenPvBlkDxeBlockIoReadBlocks, // ReadBlocks\r
	45	XenPvBlkDxeBlockIoWriteBlocks, // WriteBlocks\r
	46	XenPvBlkDxeBlockIoFlushBlocks // FlushBlocks\r
	47	};\r
	48	\r
	49	\r
	50	\r
	51	\r
	52	/**\r
	53	Read/Write BufferSize bytes from Lba into Buffer.\r
	54	\r
493dde94	55	This function is common to XenPvBlkDxeBlockIoReadBlocks and\r
5de8a35c AP	56	XenPvBlkDxeBlockIoWriteBlocks.\r
	57	\r
	58	@param This Indicates a pointer to the calling context.\r
	59	@param MediaId Id of the media, changes every time the media is replaced.\r
	60	@param Lba The starting Logical Block Address to read from/write to.\r
	61	@param BufferSize Size of Buffer, must be a multiple of device block size.\r
	62	@param Buffer A pointer to the destination/source buffer for the data.\r
	63	@param IsWrite Indicate if the operation is write or read.\r
	64	\r
	65	@return See description of XenPvBlkDxeBlockIoReadBlocks and\r
	66	XenPvBlkDxeBlockIoWriteBlocks.\r
	67	**/\r
	68	STATIC\r
	69	EFI_STATUS\r
	70	XenPvBlkDxeBlockIoReadWriteBlocks (\r
	71	IN EFI_BLOCK_IO_PROTOCOL *This,\r
	72	IN UINT32 MediaId,\r
	73	IN EFI_LBA Lba,\r
	74	IN UINTN BufferSize,\r
	75	IN OUT VOID *Buffer,\r
	76	IN BOOLEAN IsWrite\r
	77	)\r
	78	{\r
	79	XEN_BLOCK_FRONT_IO IoData;\r
	80	EFI_BLOCK_IO_MEDIA *Media = This->Media;\r
	81	UINTN Sector;\r
	82	EFI_STATUS Status;\r
	83	\r
	84	if (Buffer == NULL) {\r
	85	return EFI_INVALID_PARAMETER;\r
	86	}\r
	87	if (BufferSize == 0) {\r
	88	return EFI_SUCCESS;\r
	89	}\r
	90	\r
	91	if (BufferSize % Media->BlockSize != 0) {\r
6394c35a LE	92	DEBUG ((EFI_D_ERROR, "XenPvBlkDxe: Bad buffer size: 0x%Lx\n",\r
6394c35a LE	93	(UINT64)BufferSize));\r
5de8a35c AP	94	return EFI_BAD_BUFFER_SIZE;\r
	95	}\r
	96	\r
	97	if (Lba > Media->LastBlock \|\|\r
	98	(BufferSize / Media->BlockSize) - 1 > Media->LastBlock - Lba) {\r
6394c35a LE	99	DEBUG ((EFI_D_ERROR,\r
	100	"XenPvBlkDxe: %a with invalid LBA: 0x%Lx, size: 0x%Lx\n",\r
	101	IsWrite ? "Write" : "Read", Lba, (UINT64)BufferSize));\r
5de8a35c AP	102	return EFI_INVALID_PARAMETER;\r
	103	}\r
	104	\r
	105	if (IsWrite && Media->ReadOnly) {\r
	106	return EFI_WRITE_PROTECTED;\r
	107	}\r
	108	\r
	109	if ((Media->IoAlign > 1) && (UINTN)Buffer & (Media->IoAlign - 1)) {\r
	110	//\r
	111	// Grub2 does not appear to respect IoAlign of 512, so reallocate the\r
	112	// buffer here.\r
	113	//\r
	114	VOID *NewBuffer;\r
	115	\r
	116	//\r
	117	// Try again with a properly aligned buffer.\r
	118	//\r
	119	NewBuffer = AllocateAlignedPages((BufferSize + EFI_PAGE_SIZE) / EFI_PAGE_SIZE,\r
	120	Media->IoAlign);\r
	121	if (!IsWrite) {\r
	122	Status = XenPvBlkDxeBlockIoReadBlocks (This, MediaId,\r
	123	Lba, BufferSize, NewBuffer);\r
	124	CopyMem (Buffer, NewBuffer, BufferSize);\r
	125	} else {\r
	126	CopyMem (NewBuffer, Buffer, BufferSize);\r
	127	Status = XenPvBlkDxeBlockIoWriteBlocks (This, MediaId,\r
	128	Lba, BufferSize, NewBuffer);\r
	129	}\r
	130	FreeAlignedPages (NewBuffer, (BufferSize + EFI_PAGE_SIZE) / EFI_PAGE_SIZE);\r
	131	return Status;\r
	132	}\r
	133	\r
	134	IoData.Dev = XEN_BLOCK_FRONT_FROM_BLOCK_IO (This);\r
860088f2	135	Sector = (UINTN)MultU64x32 (Lba, Media->BlockSize / 512);\r
5de8a35c AP	136	\r
	137	while (BufferSize > 0) {\r
	138	if (((UINTN)Buffer & EFI_PAGE_MASK) == 0) {\r
	139	IoData.Size = MIN (BLKIF_MAX_SEGMENTS_PER_REQUEST * EFI_PAGE_SIZE,\r
	140	BufferSize);\r
	141	} else {\r
	142	IoData.Size = MIN ((BLKIF_MAX_SEGMENTS_PER_REQUEST - 1) * EFI_PAGE_SIZE,\r
	143	BufferSize);\r
	144	}\r
	145	\r
	146	IoData.Buffer = Buffer;\r
	147	IoData.Sector = Sector;\r
	148	BufferSize -= IoData.Size;\r
	149	Buffer = (VOID*) ((UINTN) Buffer + IoData.Size);\r
	150	Sector += IoData.Size / 512;\r
	151	Status = XenPvBlockIo (&IoData, IsWrite);\r
	152	if (EFI_ERROR (Status)) {\r
8c0b0b34	153	DEBUG ((EFI_D_ERROR, "XenPvBlkDxe: Error during %a operation.\n",\r
5de8a35c AP	154	IsWrite ? "write" : "read"));\r
	155	return Status;\r
	156	}\r
	157	}\r
	158	return EFI_SUCCESS;\r
	159	}\r
	160	\r
	161	\r
	162	/**\r
	163	Read BufferSize bytes from Lba into Buffer.\r
	164	\r
	165	@param This Indicates a pointer to the calling context.\r
	166	@param MediaId Id of the media, changes every time the media is replaced.\r
	167	@param Lba The starting Logical Block Address to read from\r
	168	@param BufferSize Size of Buffer, must be a multiple of device block size.\r
	169	@param Buffer A pointer to the destination buffer for the data. The caller is\r
	170	responsible for either having implicit or explicit ownership of the buffer.\r
	171	\r
	172	@retval EFI_SUCCESS The data was read correctly from the device.\r
	173	@retval EFI_DEVICE_ERROR The device reported an error while performing the read.\r
	174	@retval EFI_NO_MEDIA There is no media in the device.\r
493dde94	175	@retval EFI_MEDIA_CHANGED The MediaId does not match the current device.\r
5de8a35c AP	176	@retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.\r
	177	@retval EFI_INVALID_PARAMETER The read request contains LBAs that are not valid,\r
	178	or the buffer is not on proper alignment.\r
	179	\r
	180	**/\r
	181	EFI_STATUS\r
	182	EFIAPI\r
	183	XenPvBlkDxeBlockIoReadBlocks (\r
	184	IN EFI_BLOCK_IO_PROTOCOL *This,\r
	185	IN UINT32 MediaId,\r
	186	IN EFI_LBA Lba,\r
	187	IN UINTN BufferSize,\r
	188	OUT VOID *Buffer\r
	189	)\r
	190	{\r
	191	return XenPvBlkDxeBlockIoReadWriteBlocks (This,\r
	192	MediaId, Lba, BufferSize, Buffer, FALSE);\r
	193	}\r
	194	\r
	195	/**\r
	196	Write BufferSize bytes from Lba into Buffer.\r
	197	\r
	198	@param This Indicates a pointer to the calling context.\r
	199	@param MediaId The media ID that the write request is for.\r
	200	@param Lba The starting logical block address to be written. The caller is\r
	201	responsible for writing to only legitimate locations.\r
	202	@param BufferSize Size of Buffer, must be a multiple of device block size.\r
	203	@param Buffer A pointer to the source buffer for the data.\r
	204	\r
	205	@retval EFI_SUCCESS The data was written correctly to the device.\r
	206	@retval EFI_WRITE_PROTECTED The device can not be written to.\r
	207	@retval EFI_DEVICE_ERROR The device reported an error while performing the write.\r
	208	@retval EFI_NO_MEDIA There is no media in the device.\r
493dde94	209	@retval EFI_MEDIA_CHANGED The MediaId does not match the current device.\r
5de8a35c AP	210	@retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.\r
	211	@retval EFI_INVALID_PARAMETER The write request contains LBAs that are not valid,\r
	212	or the buffer is not on proper alignment.\r
	213	\r
	214	**/\r
	215	EFI_STATUS\r
	216	EFIAPI\r
	217	XenPvBlkDxeBlockIoWriteBlocks (\r
	218	IN EFI_BLOCK_IO_PROTOCOL *This,\r
	219	IN UINT32 MediaId,\r
	220	IN EFI_LBA Lba,\r
	221	IN UINTN BufferSize,\r
	222	IN VOID *Buffer\r
	223	)\r
	224	{\r
	225	return XenPvBlkDxeBlockIoReadWriteBlocks (This,\r
	226	MediaId, Lba, BufferSize, Buffer, TRUE);\r
	227	}\r
	228	\r
	229	/**\r
	230	Flush the Block Device.\r
	231	\r
	232	@param This Indicates a pointer to the calling context.\r
	233	\r
	234	@retval EFI_SUCCESS All outstanding data was written to the device\r
493dde94	235	@retval EFI_DEVICE_ERROR The device reported an error while writing back the data\r
5de8a35c AP	236	@retval EFI_NO_MEDIA There is no media in the device.\r
	237	\r
	238	**/\r
	239	EFI_STATUS\r
	240	EFIAPI\r
	241	XenPvBlkDxeBlockIoFlushBlocks (\r
	242	IN EFI_BLOCK_IO_PROTOCOL *This\r
	243	)\r
	244	{\r
	245	XenPvBlockSync (XEN_BLOCK_FRONT_FROM_BLOCK_IO (This));\r
	246	return EFI_SUCCESS;\r
	247	}\r
	248	\r
	249	/**\r
	250	Reset the block device hardware.\r
	251	\r
	252	@param[in] This Indicates a pointer to the calling context.\r
	253	@param[in] ExtendedVerification Not used.\r
	254	\r
	255	@retval EFI_SUCCESS The device was reset.\r
	256	\r
	257	**/\r
	258	EFI_STATUS\r
	259	EFIAPI\r
	260	XenPvBlkDxeBlockIoReset (\r
	261	IN EFI_BLOCK_IO_PROTOCOL *This,\r
	262	IN BOOLEAN ExtendedVerification\r
	263	)\r
	264	{\r
	265	//\r
	266	// Since the initialization of the devices is done, then the device is\r
	267	// working correctly.\r
	268	//\r
	269	return EFI_SUCCESS;\r
	270	}\r