[mirror_edk2.git] / MdePkg / Library / UefiLib / UefiNotTiano.c

/** @file\r
  Library functions that abstract areas of conflict between framework and UEFI 2.0.\r
\r
  Help Port Framework code that has conflicts with UEFI 2.0 by hiding the\r
  old conflicts with library functions and supporting implementations of the old\r
  (EDK/EFI 1.10) and new (EDK II/UEFI 2.0) way. This module is a DXE driver as\r
  it contains DXE enum extensions for EFI event services.\r
\r
Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
All rights reserved. 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
\r
\r
#include "UefiLibInternal.h"\r
\r
/**\r
  An empty function to pass error checking of CreateEventEx ().\r
\r
  This empty function ensures that EVT_NOTIFY_SIGNAL_ALL is error\r
  checked correctly since it is now mapped into CreateEventEx() in UEFI 2.0.\r
 \r
  @param  Event                 Event whose notification function is being invoked.\r
  @param  Context               Pointer to the notification function's context,\r
                                which is implementation-dependent.\r
\r
**/\r
VOID\r
EFIAPI\r
InternalEmptyFuntion (\r
  IN EFI_EVENT                Event,\r
  IN VOID                     *Context\r
  )\r
{\r
  return;\r
}\r
\r
/**\r
  Create a Legacy Boot Event.\r
\r
  Tiano extended the CreateEvent Type enum to add a legacy boot event type.\r
  This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was\r
  added and now it's possible to not voilate the UEFI specification by\r
  declaring a GUID for the legacy boot event class. This library supports\r
  the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to\r
  work both ways.\r
\r
  @param  LegacyBootEvent   Returns the EFI event returned from gBS->CreateEvent(Ex).\r
\r
  @retval EFI_SUCCESS       Event was created.\r
  @retval Other             Event was not created.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
EfiCreateEventLegacyBoot (\r
  OUT EFI_EVENT  *LegacyBootEvent\r
  )\r
{\r
  return EfiCreateEventLegacyBootEx (\r
           TPL_CALLBACK,\r
           InternalEmptyFuntion,\r
           NULL,\r
           LegacyBootEvent\r
           );\r
}\r
\r
/**\r
  Create an EFI event in the Legacy Boot Event Group and allows\r
  the caller to specify a notification function.\r
\r
  This function abstracts the creation of the Legacy Boot Event.\r
  The Framework moved from a proprietary to UEFI 2.0 based mechanism.\r
  This library abstracts the caller from how this event is created to prevent\r
  to code form having to change with the version of the specification supported.\r
  If LegacyBootEvent is NULL, then ASSERT().\r
\r
  @param  NotifyTpl         The task priority level of the event.\r
  @param  NotifyFunction    The notification function to call when the event is signaled.\r
  @param  NotifyContext     The content to pass to NotifyFunction when the event is signaled.\r
  @param  LegacyBootEvent   Returns the EFI event returned from gBS->CreateEvent(Ex).\r
\r
  @retval EFI_SUCCESS       Event was created.\r
  @retval Other             Event was not created.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
EfiCreateEventLegacyBootEx (\r
  IN  EFI_TPL           NotifyTpl,\r
  IN  EFI_EVENT_NOTIFY  NotifyFunction,  OPTIONAL\r
  IN  VOID              *NotifyContext,  OPTIONAL\r
  OUT EFI_EVENT         *LegacyBootEvent\r
  )\r
{\r
  EFI_STATUS    Status;\r
\r
  ASSERT (LegacyBootEvent != NULL);\r
\r
  if (gST->Hdr.Revision < EFI_2_00_SYSTEM_TABLE_REVISION) {\r
    DEBUG ((EFI_D_ERROR, "EFI1.1 can't support LegacyBootEvent!"));\r
    ASSERT (FALSE);\r
\r
    return EFI_UNSUPPORTED;\r
  } else {\r
    //\r
    // For UEFI 2.0 and the future use an Event Group\r
    //\r
    Status = gBS->CreateEventEx (\r
                    EVT_NOTIFY_SIGNAL,\r
                    NotifyTpl,\r
                    NotifyFunction,\r
                    NotifyContext,\r
                    &gEfiEventLegacyBootGuid,\r
                    LegacyBootEvent\r
                    );\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Create a "Ready to Boot" Event.\r
\r
  Tiano extended the CreateEvent Type enum to add a ready to boot event type.\r
  This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was\r
  added and now it's possible to not voilate the UEFI specification and use\r
  the ready to boot event class defined in UEFI 2.0. This library supports\r
  the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to\r
  work both ways.\r
\r
  @param  ReadyToBootEvent  Returns the EFI event returned from gBS->CreateEvent(Ex).\r
\r
  @retval EFI_SUCCESS       Event was created.\r
  @retval Other             Event was not created.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
EfiCreateEventReadyToBoot (\r
  OUT EFI_EVENT  *ReadyToBootEvent\r
  )\r
{\r
  return EfiCreateEventReadyToBootEx (\r
           TPL_CALLBACK,\r
           InternalEmptyFuntion,\r
           NULL,\r
           ReadyToBootEvent\r
           );\r
}\r
\r
/**\r
  Create an EFI event in the Ready To Boot Event Group and allows\r
  the caller to specify a notification function.\r
\r
  This function abstracts the creation of the Ready to Boot Event.\r
  The Framework moved from a proprietary to UEFI 2.0 based mechanism.\r
  This library abstracts the caller from how this event is created to prevent\r
  to code form having to change with the version of the specification supported.\r
  If ReadyToBootEvent is NULL, then ASSERT().\r
\r
  @param  NotifyTpl         The task priority level of the event.\r
  @param  NotifyFunction    The notification function to call when the event is signaled.\r
  @param  NotifyContext     The content to pass to NotifyFunction when the event is signaled.\r
  @param  ReadyToBootEvent  Returns the EFI event returned from gBS->CreateEvent(Ex).\r
\r
  @retval EFI_SUCCESS       Event was created.\r
  @retval Other             Event was not created.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
EfiCreateEventReadyToBootEx (\r
  IN  EFI_TPL           NotifyTpl,\r
  IN  EFI_EVENT_NOTIFY  NotifyFunction,  OPTIONAL\r
  IN  VOID              *NotifyContext,  OPTIONAL\r
  OUT EFI_EVENT         *ReadyToBootEvent\r
  )\r
{\r
  EFI_STATUS    Status;\r
\r
  ASSERT (ReadyToBootEvent != NULL);\r
\r
  if (gST->Hdr.Revision < EFI_2_00_SYSTEM_TABLE_REVISION) {\r
    DEBUG ((EFI_D_ERROR, "EFI1.1 can't support ReadyToBootEvent!"));\r
    ASSERT (FALSE);\r
\r
    return EFI_UNSUPPORTED;\r
  } else {\r
    //\r
    // For UEFI 2.0 and the future use an Event Group\r
    //\r
    Status = gBS->CreateEventEx (\r
                    EVT_NOTIFY_SIGNAL,\r
                    NotifyTpl,\r
                    NotifyFunction,\r
                    NotifyContext,\r
                    &gEfiEventReadyToBootGuid,\r
                    ReadyToBootEvent\r
                    );\r
  }\r
\r
  return Status;\r
}\r
\r
\r
/**\r
  Signal a Ready to Boot Event.\r
\r
  Create a Ready to Boot Event. Signal it and close it. This causes other\r
  events of the same event group to be signaled in other modules.\r
\r
**/\r
VOID\r
EFIAPI\r
EfiSignalEventReadyToBoot (\r
  VOID\r
  )\r
{\r
  EFI_STATUS    Status;\r
  EFI_EVENT     ReadyToBootEvent;\r
\r
  Status = EfiCreateEventReadyToBoot (&ReadyToBootEvent);\r
  if (!EFI_ERROR (Status)) {\r
    gBS->SignalEvent (ReadyToBootEvent);\r
    gBS->CloseEvent (ReadyToBootEvent);\r
  }\r
}\r
\r
/**\r
  Signal a Legacy Boot Event.\r
\r
  Create a legacy Boot Event. Signal it and close it. This causes other\r
  events of the same event group to be signaled in other modules.\r
\r
**/\r
VOID\r
EFIAPI\r
EfiSignalEventLegacyBoot (\r
  VOID\r
  )\r
{\r
  EFI_STATUS    Status;\r
  EFI_EVENT     LegacyBootEvent;\r
\r
  Status = EfiCreateEventLegacyBoot (&LegacyBootEvent);\r
  if (!EFI_ERROR (Status)) {\r
    gBS->SignalEvent (LegacyBootEvent);\r
    gBS->CloseEvent (LegacyBootEvent);\r
  }\r
}\r
\r
\r
/**\r
  Check to see if the Firmware Volume (FV) Media Device Path is valid\r
\r
  Tiano extended the EFI 1.10 device path nodes. Tiano does not own this enum\r
  so as we move to UEFI 2.0 support we must use a mechanism that conforms with\r
  the UEFI 2.0 specification to define the FV device path. An UEFI GUIDed\r
  device path is defined for Tiano extensions of device path. If the code\r
  is compiled to conform with the UEFI 2.0 specification use the new device path\r
  else use the old form for backwards compatability. The return value to this\r
  function points to a location in FvDevicePathNode and it does not allocate\r
  new memory for the GUID pointer that is returned.\r
  If FvDevicePathNode is NULL, then ASSERT().\r
  \r
  @param  FvFileDevicePathNode  Pointer to FV device path to check.\r
\r
  @retval NULL              FvDevicePathNode is not valid.\r
  @retval Other             FvDevicePathNode is valid and pointer to NameGuid was returned.\r
\r
**/\r
EFI_GUID*\r
EFIAPI\r
EfiGetNameGuidFromFwVolDevicePathNode (\r
  IN CONST MEDIA_FW_VOL_FILEPATH_DEVICE_PATH  *FvFileDevicePathNode\r
  )\r
{\r
  ASSERT (FvFileDevicePathNode != NULL);\r
\r
  if (DevicePathType (&FvFileDevicePathNode->Header) == MEDIA_DEVICE_PATH &&\r
      DevicePathSubType (&FvFileDevicePathNode->Header) == MEDIA_PIWG_FW_FILE_DP) {\r
    return (EFI_GUID *) &FvFileDevicePathNode->FvFileName;\r
  }\r
\r
  return NULL;\r
}\r
\r
\r
/**\r
  Initialize a Firmware Volume (FV) Media Device Path node.\r
\r
  Tiano extended the EFI 1.10 device path nodes. Tiano does not own this enum\r
  so as we move to UEFI 2.0 support we must use a mechanism that conforms with\r
  the UEFI 2.0 specification to define the FV device path. An UEFI GUIDed\r
  device path is defined for Tiano extensions of device path. If the code\r
  is compiled to conform with the UEFI 2.0 specification use the new device path\r
  else use the old form for backwards compatability.\r
  If FvDevicePathNode is NULL, then ASSERT().\r
  If NameGuid is NULL, then ASSERT().\r
\r
  @param  FvFileDevicePathNode  Pointer to a FV device path node to initialize\r
  @param  NameGuid          FV file name to use in FvDevicePathNode\r
\r
**/\r
VOID\r
EFIAPI\r
EfiInitializeFwVolDevicepathNode (\r
  IN OUT    MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *FvFileDevicePathNode,\r
  IN CONST  EFI_GUID                          *NameGuid\r
  )\r
{\r
  ASSERT (FvFileDevicePathNode  != NULL);\r
  ASSERT (NameGuid          != NULL);\r
\r
  //\r
  // Use the new Device path that does not conflict with the UEFI\r
  //\r
  FvFileDevicePathNode->Header.Type     = MEDIA_DEVICE_PATH;\r
  FvFileDevicePathNode->Header.SubType  = MEDIA_PIWG_FW_FILE_DP;\r
  SetDevicePathNodeLength (&FvFileDevicePathNode->Header, sizeof (MEDIA_FW_VOL_FILEPATH_DEVICE_PATH));\r
\r
  CopyGuid (&FvFileDevicePathNode->FvFileName, NameGuid);\r
}\r
\r
Commit	Line	Data
	1	/** @file\r
	2	Library functions that abstract areas of conflict between framework and UEFI 2.0.\r
	3	\r
	4	Help Port Framework code that has conflicts with UEFI 2.0 by hiding the\r
	5	old conflicts with library functions and supporting implementations of the old\r
	6	(EDK/EFI 1.10) and new (EDK II/UEFI 2.0) way. This module is a DXE driver as\r
	7	it contains DXE enum extensions for EFI event services.\r
	8	\r
	9	Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
	10	All rights reserved. This program and the accompanying materials\r
	11	are licensed and made available under the terms and conditions of the BSD License\r
	12	which accompanies this distribution. The full text of the license may be found at\r
	13	http://opensource.org/licenses/bsd-license.php\r
	14	\r
	15	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	16	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	17	\r
	18	**/\r
	19	\r
	20	\r
	21	\r
	22	#include "UefiLibInternal.h"\r
	23	\r
	24	/**\r
	25	An empty function to pass error checking of CreateEventEx ().\r
	26	\r
	27	This empty function ensures that EVT_NOTIFY_SIGNAL_ALL is error\r
	28	checked correctly since it is now mapped into CreateEventEx() in UEFI 2.0.\r
	29	\r
	30	@param Event Event whose notification function is being invoked.\r
	31	@param Context Pointer to the notification function's context,\r
	32	which is implementation-dependent.\r
	33	\r
	34	**/\r
	35	VOID\r
	36	EFIAPI\r
	37	InternalEmptyFuntion (\r
	38	IN EFI_EVENT Event,\r
	39	IN VOID *Context\r
	40	)\r
	41	{\r
	42	return;\r
	43	}\r
	44	\r
	45	/**\r
	46	Create a Legacy Boot Event.\r
	47	\r
	48	Tiano extended the CreateEvent Type enum to add a legacy boot event type.\r
	49	This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was\r
	50	added and now it's possible to not voilate the UEFI specification by\r
	51	declaring a GUID for the legacy boot event class. This library supports\r
	52	the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to\r
	53	work both ways.\r
	54	\r
	55	@param LegacyBootEvent Returns the EFI event returned from gBS->CreateEvent(Ex).\r
	56	\r
	57	@retval EFI_SUCCESS Event was created.\r
	58	@retval Other Event was not created.\r
	59	\r
	60	**/\r
	61	EFI_STATUS\r
	62	EFIAPI\r
	63	EfiCreateEventLegacyBoot (\r
	64	OUT EFI_EVENT *LegacyBootEvent\r
	65	)\r
	66	{\r
	67	return EfiCreateEventLegacyBootEx (\r
	68	TPL_CALLBACK,\r
	69	InternalEmptyFuntion,\r
	70	NULL,\r
	71	LegacyBootEvent\r
	72	);\r
	73	}\r
	74	\r
	75	/**\r
	76	Create an EFI event in the Legacy Boot Event Group and allows\r
	77	the caller to specify a notification function.\r
	78	\r
	79	This function abstracts the creation of the Legacy Boot Event.\r
	80	The Framework moved from a proprietary to UEFI 2.0 based mechanism.\r
	81	This library abstracts the caller from how this event is created to prevent\r
	82	to code form having to change with the version of the specification supported.\r
	83	If LegacyBootEvent is NULL, then ASSERT().\r
	84	\r
	85	@param NotifyTpl The task priority level of the event.\r
	86	@param NotifyFunction The notification function to call when the event is signaled.\r
	87	@param NotifyContext The content to pass to NotifyFunction when the event is signaled.\r
	88	@param LegacyBootEvent Returns the EFI event returned from gBS->CreateEvent(Ex).\r
	89	\r
	90	@retval EFI_SUCCESS Event was created.\r
	91	@retval Other Event was not created.\r
	92	\r
	93	**/\r
	94	EFI_STATUS\r
	95	EFIAPI\r
	96	EfiCreateEventLegacyBootEx (\r
	97	IN EFI_TPL NotifyTpl,\r
	98	IN EFI_EVENT_NOTIFY NotifyFunction, OPTIONAL\r
	99	IN VOID *NotifyContext, OPTIONAL\r
	100	OUT EFI_EVENT *LegacyBootEvent\r
	101	)\r
	102	{\r
	103	EFI_STATUS Status;\r
	104	\r
	105	ASSERT (LegacyBootEvent != NULL);\r
	106	\r
	107	if (gST->Hdr.Revision < EFI_2_00_SYSTEM_TABLE_REVISION) {\r
	108	DEBUG ((EFI_D_ERROR, "EFI1.1 can't support LegacyBootEvent!"));\r
	109	ASSERT (FALSE);\r
	110	\r
	111	return EFI_UNSUPPORTED;\r
	112	} else {\r
	113	//\r
	114	// For UEFI 2.0 and the future use an Event Group\r
	115	//\r
	116	Status = gBS->CreateEventEx (\r
	117	EVT_NOTIFY_SIGNAL,\r
	118	NotifyTpl,\r
	119	NotifyFunction,\r
	120	NotifyContext,\r
	121	&gEfiEventLegacyBootGuid,\r
	122	LegacyBootEvent\r
	123	);\r
	124	}\r
	125	\r
	126	return Status;\r
	127	}\r
	128	\r
	129	/**\r
	130	Create a "Ready to Boot" Event.\r
	131	\r
	132	Tiano extended the CreateEvent Type enum to add a ready to boot event type.\r
	133	This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was\r
	134	added and now it's possible to not voilate the UEFI specification and use\r
	135	the ready to boot event class defined in UEFI 2.0. This library supports\r
	136	the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to\r
	137	work both ways.\r
	138	\r
	139	@param ReadyToBootEvent Returns the EFI event returned from gBS->CreateEvent(Ex).\r
	140	\r
	141	@retval EFI_SUCCESS Event was created.\r
	142	@retval Other Event was not created.\r
	143	\r
	144	**/\r
	145	EFI_STATUS\r
	146	EFIAPI\r
	147	EfiCreateEventReadyToBoot (\r
	148	OUT EFI_EVENT *ReadyToBootEvent\r
	149	)\r
	150	{\r
	151	return EfiCreateEventReadyToBootEx (\r
	152	TPL_CALLBACK,\r
	153	InternalEmptyFuntion,\r
	154	NULL,\r
	155	ReadyToBootEvent\r
	156	);\r
	157	}\r
	158	\r
	159	/**\r
	160	Create an EFI event in the Ready To Boot Event Group and allows\r
	161	the caller to specify a notification function.\r
	162	\r
	163	This function abstracts the creation of the Ready to Boot Event.\r
	164	The Framework moved from a proprietary to UEFI 2.0 based mechanism.\r
	165	This library abstracts the caller from how this event is created to prevent\r
	166	to code form having to change with the version of the specification supported.\r
	167	If ReadyToBootEvent is NULL, then ASSERT().\r
	168	\r
	169	@param NotifyTpl The task priority level of the event.\r
	170	@param NotifyFunction The notification function to call when the event is signaled.\r
	171	@param NotifyContext The content to pass to NotifyFunction when the event is signaled.\r
	172	@param ReadyToBootEvent Returns the EFI event returned from gBS->CreateEvent(Ex).\r
	173	\r
	174	@retval EFI_SUCCESS Event was created.\r
	175	@retval Other Event was not created.\r
	176	\r
	177	**/\r
	178	EFI_STATUS\r
	179	EFIAPI\r
	180	EfiCreateEventReadyToBootEx (\r
	181	IN EFI_TPL NotifyTpl,\r
	182	IN EFI_EVENT_NOTIFY NotifyFunction, OPTIONAL\r
	183	IN VOID *NotifyContext, OPTIONAL\r
	184	OUT EFI_EVENT *ReadyToBootEvent\r
	185	)\r
	186	{\r
	187	EFI_STATUS Status;\r
	188	\r
	189	ASSERT (ReadyToBootEvent != NULL);\r
	190	\r
	191	if (gST->Hdr.Revision < EFI_2_00_SYSTEM_TABLE_REVISION) {\r
	192	DEBUG ((EFI_D_ERROR, "EFI1.1 can't support ReadyToBootEvent!"));\r
	193	ASSERT (FALSE);\r
	194	\r
	195	return EFI_UNSUPPORTED;\r
	196	} else {\r
	197	//\r
	198	// For UEFI 2.0 and the future use an Event Group\r
	199	//\r
	200	Status = gBS->CreateEventEx (\r
	201	EVT_NOTIFY_SIGNAL,\r
	202	NotifyTpl,\r
	203	NotifyFunction,\r
	204	NotifyContext,\r
	205	&gEfiEventReadyToBootGuid,\r
	206	ReadyToBootEvent\r
	207	);\r
	208	}\r
	209	\r
	210	return Status;\r
	211	}\r
	212	\r
	213	\r
	214	/**\r
	215	Signal a Ready to Boot Event.\r
	216	\r
	217	Create a Ready to Boot Event. Signal it and close it. This causes other\r
	218	events of the same event group to be signaled in other modules.\r
	219	\r
	220	**/\r
	221	VOID\r
	222	EFIAPI\r
	223	EfiSignalEventReadyToBoot (\r
	224	VOID\r
	225	)\r
	226	{\r
	227	EFI_STATUS Status;\r
	228	EFI_EVENT ReadyToBootEvent;\r
	229	\r
	230	Status = EfiCreateEventReadyToBoot (&ReadyToBootEvent);\r
	231	if (!EFI_ERROR (Status)) {\r
	232	gBS->SignalEvent (ReadyToBootEvent);\r
	233	gBS->CloseEvent (ReadyToBootEvent);\r
	234	}\r
	235	}\r
	236	\r
	237	/**\r
	238	Signal a Legacy Boot Event.\r
	239	\r
	240	Create a legacy Boot Event. Signal it and close it. This causes other\r
	241	events of the same event group to be signaled in other modules.\r
	242	\r
	243	**/\r
	244	VOID\r
	245	EFIAPI\r
	246	EfiSignalEventLegacyBoot (\r
	247	VOID\r
	248	)\r
	249	{\r
	250	EFI_STATUS Status;\r
	251	EFI_EVENT LegacyBootEvent;\r
	252	\r
	253	Status = EfiCreateEventLegacyBoot (&LegacyBootEvent);\r
	254	if (!EFI_ERROR (Status)) {\r
	255	gBS->SignalEvent (LegacyBootEvent);\r
	256	gBS->CloseEvent (LegacyBootEvent);\r
	257	}\r
	258	}\r
	259	\r
	260	\r
	261	/**\r
	262	Check to see if the Firmware Volume (FV) Media Device Path is valid\r
	263	\r
	264	Tiano extended the EFI 1.10 device path nodes. Tiano does not own this enum\r
	265	so as we move to UEFI 2.0 support we must use a mechanism that conforms with\r
	266	the UEFI 2.0 specification to define the FV device path. An UEFI GUIDed\r
	267	device path is defined for Tiano extensions of device path. If the code\r
	268	is compiled to conform with the UEFI 2.0 specification use the new device path\r
	269	else use the old form for backwards compatability. The return value to this\r
	270	function points to a location in FvDevicePathNode and it does not allocate\r
	271	new memory for the GUID pointer that is returned.\r
	272	If FvDevicePathNode is NULL, then ASSERT().\r
	273	\r
	274	@param FvFileDevicePathNode Pointer to FV device path to check.\r
	275	\r
	276	@retval NULL FvDevicePathNode is not valid.\r
	277	@retval Other FvDevicePathNode is valid and pointer to NameGuid was returned.\r
	278	\r
	279	**/\r
	280	EFI_GUID*\r
	281	EFIAPI\r
	282	EfiGetNameGuidFromFwVolDevicePathNode (\r
	283	IN CONST MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *FvFileDevicePathNode\r
	284	)\r
	285	{\r
	286	ASSERT (FvFileDevicePathNode != NULL);\r
	287	\r
	288	if (DevicePathType (&FvFileDevicePathNode->Header) == MEDIA_DEVICE_PATH &&\r
	289	DevicePathSubType (&FvFileDevicePathNode->Header) == MEDIA_PIWG_FW_FILE_DP) {\r
	290	return (EFI_GUID *) &FvFileDevicePathNode->FvFileName;\r
	291	}\r
	292	\r
	293	return NULL;\r
	294	}\r
	295	\r
	296	\r
	297	/**\r
	298	Initialize a Firmware Volume (FV) Media Device Path node.\r
	299	\r
	300	Tiano extended the EFI 1.10 device path nodes. Tiano does not own this enum\r
	301	so as we move to UEFI 2.0 support we must use a mechanism that conforms with\r
	302	the UEFI 2.0 specification to define the FV device path. An UEFI GUIDed\r
	303	device path is defined for Tiano extensions of device path. If the code\r
	304	is compiled to conform with the UEFI 2.0 specification use the new device path\r
	305	else use the old form for backwards compatability.\r
	306	If FvDevicePathNode is NULL, then ASSERT().\r
	307	If NameGuid is NULL, then ASSERT().\r
	308	\r
	309	@param FvFileDevicePathNode Pointer to a FV device path node to initialize\r
	310	@param NameGuid FV file name to use in FvDevicePathNode\r
	311	\r
	312	**/\r
	313	VOID\r
	314	EFIAPI\r
	315	EfiInitializeFwVolDevicepathNode (\r
	316	IN OUT MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *FvFileDevicePathNode,\r
	317	IN CONST EFI_GUID *NameGuid\r
	318	)\r
	319	{\r
	320	ASSERT (FvFileDevicePathNode != NULL);\r
	321	ASSERT (NameGuid != NULL);\r
	322	\r
	323	//\r
	324	// Use the new Device path that does not conflict with the UEFI\r
	325	//\r
	326	FvFileDevicePathNode->Header.Type = MEDIA_DEVICE_PATH;\r
	327	FvFileDevicePathNode->Header.SubType = MEDIA_PIWG_FW_FILE_DP;\r
	328	SetDevicePathNodeLength (&FvFileDevicePathNode->Header, sizeof (MEDIA_FW_VOL_FILEPATH_DEVICE_PATH));\r
	329	\r
	330	CopyGuid (&FvFileDevicePathNode->FvFileName, NameGuid);\r
	331	}\r
	332	\r