[mirror_edk2.git] / MdeModulePkg / Universal / Disk / RamDiskDxe / RamDiskProtocol.c

/** @file\r
  The realization of EFI_RAM_DISK_PROTOCOL.\r
\r
  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\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 "RamDiskImpl.h"\r
\r
RAM_DISK_PRIVATE_DATA mRamDiskPrivateDataTemplate = {\r
  RAM_DISK_PRIVATE_DATA_SIGNATURE,\r
  NULL\r
};\r
\r
MEDIA_RAM_DISK_DEVICE_PATH  mRamDiskDeviceNodeTemplate = {\r
  {\r
    MEDIA_DEVICE_PATH,\r
    MEDIA_RAM_DISK_DP,\r
    {\r
      (UINT8) (sizeof (MEDIA_RAM_DISK_DEVICE_PATH)),\r
      (UINT8) ((sizeof (MEDIA_RAM_DISK_DEVICE_PATH)) >> 8)\r
    }\r
  }\r
};\r
\r
\r
/**\r
  Initialize the RAM disk device node.\r
\r
  @param[in]      PrivateData     Points to RAM disk private data.\r
  @param[in, out] RamDiskDevNode  Points to the RAM disk device node.\r
\r
**/\r
VOID\r
RamDiskInitDeviceNode (\r
  IN     RAM_DISK_PRIVATE_DATA         *PrivateData,\r
  IN OUT MEDIA_RAM_DISK_DEVICE_PATH    *RamDiskDevNode\r
  )\r
{\r
  WriteUnaligned64 (\r
    (UINT64 *) &(RamDiskDevNode->StartingAddr[0]),\r
    (UINT64) PrivateData->StartingAddr\r
    );\r
  WriteUnaligned64 (\r
    (UINT64 *) &(RamDiskDevNode->EndingAddr[0]),\r
    (UINT64) PrivateData->StartingAddr + PrivateData->Size\r
    );\r
  CopyGuid (&RamDiskDevNode->TypeGuid, &PrivateData->TypeGuid);\r
  RamDiskDevNode->Instance = PrivateData->InstanceNumber;\r
}\r
\r
\r
/**\r
  Register a RAM disk with specified address, size and type.\r
\r
  @param[in]  RamDiskBase    The base address of registered RAM disk.\r
  @param[in]  RamDiskSize    The size of registered RAM disk.\r
  @param[in]  RamDiskType    The type of registered RAM disk. The GUID can be\r
                             any of the values defined in section 9.3.6.9, or a\r
                             vendor defined GUID.\r
  @param[in]  ParentDevicePath\r
                             Pointer to the parent device path. If there is no\r
                             parent device path then ParentDevicePath is NULL.\r
  @param[out] DevicePath     On return, points to a pointer to the device path\r
                             of the RAM disk device.\r
                             If ParentDevicePath is not NULL, the returned\r
                             DevicePath is created by appending a RAM disk node\r
                             to the parent device path. If ParentDevicePath is\r
                             NULL, the returned DevicePath is a RAM disk device\r
                             path without appending. This function is\r
                             responsible for allocating the buffer DevicePath\r
                             with the boot service AllocatePool().\r
\r
  @retval EFI_SUCCESS             The RAM disk is registered successfully.\r
  @retval EFI_INVALID_PARAMETER   DevicePath or RamDiskType is NULL.\r
                                  RamDiskSize is 0.\r
  @retval EFI_ALREADY_STARTED     A Device Path Protocol instance to be created\r
                                  is already present in the handle database.\r
  @retval EFI_OUT_OF_RESOURCES    The RAM disk register operation fails due to\r
                                  resource limitation.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
RamDiskRegister (\r
  IN UINT64                       RamDiskBase,\r
  IN UINT64                       RamDiskSize,\r
  IN EFI_GUID                     *RamDiskType,\r
  IN EFI_DEVICE_PATH              *ParentDevicePath     OPTIONAL,\r
  OUT EFI_DEVICE_PATH_PROTOCOL    **DevicePath\r
  )\r
{\r
  EFI_STATUS                      Status;\r
  RAM_DISK_PRIVATE_DATA           *PrivateData;\r
  RAM_DISK_PRIVATE_DATA           *RegisteredPrivateData;\r
  MEDIA_RAM_DISK_DEVICE_PATH      *RamDiskDevNode;\r
  UINTN                           DevicePathSize;\r
  LIST_ENTRY                      *Entry;\r
  EFI_TPL                         OldTpl;\r
\r
  if ((0 == RamDiskSize) || (NULL == RamDiskType) || (NULL == DevicePath)) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  //\r
  // Add check to prevent data read across the memory boundary\r
  //\r
  if (RamDiskBase + RamDiskSize > ((UINTN) -1) - RAM_DISK_BLOCK_SIZE + 1) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  RamDiskDevNode = NULL;\r
\r
  //\r
  // Create a new RAM disk instance and initialize its private data\r
  //\r
  PrivateData = AllocateCopyPool (\r
                  sizeof (RAM_DISK_PRIVATE_DATA),\r
                  &mRamDiskPrivateDataTemplate\r
                  );\r
  if (NULL == PrivateData) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  PrivateData->StartingAddr = RamDiskBase;\r
  PrivateData->Size         = RamDiskSize;\r
  CopyGuid (&PrivateData->TypeGuid, RamDiskType);\r
  InitializeListHead (&PrivateData->ThisInstance);\r
\r
  //\r
  // Generate device path information for the registered RAM disk\r
  //\r
  RamDiskDevNode = AllocateCopyPool (\r
                     sizeof (MEDIA_RAM_DISK_DEVICE_PATH),\r
                     &mRamDiskDeviceNodeTemplate\r
                     );\r
  if (NULL == RamDiskDevNode) {\r
    Status = EFI_OUT_OF_RESOURCES;\r
    goto ErrorExit;\r
  }\r
\r
  RamDiskInitDeviceNode (PrivateData, RamDiskDevNode);\r
\r
  *DevicePath = AppendDevicePathNode (\r
                  ParentDevicePath,\r
                  (EFI_DEVICE_PATH_PROTOCOL *) RamDiskDevNode\r
                  );\r
  if (NULL == *DevicePath) {\r
    Status = EFI_OUT_OF_RESOURCES;\r
    goto ErrorExit;\r
  }\r
\r
  PrivateData->DevicePath = *DevicePath;\r
\r
  //\r
  // Check whether the created device path is already present in the handle\r
  // database\r
  //\r
  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);\r
  if (!IsListEmpty(&RegisteredRamDisks)) {\r
    DevicePathSize = GetDevicePathSize (PrivateData->DevicePath);\r
\r
    EFI_LIST_FOR_EACH (Entry, &RegisteredRamDisks) {\r
      RegisteredPrivateData = RAM_DISK_PRIVATE_FROM_THIS (Entry);\r
      if (DevicePathSize == GetDevicePathSize (RegisteredPrivateData->DevicePath)) {\r
        //\r
        // Compare device path\r
        //\r
        if ((CompareMem (\r
               PrivateData->DevicePath,\r
               RegisteredPrivateData->DevicePath,\r
               DevicePathSize)) == 0) {\r
          *DevicePath = NULL;\r
          Status      = EFI_ALREADY_STARTED;\r
          goto ErrorExit;\r
        }\r
      }\r
    }\r
  }\r
  gBS->RestoreTPL (OldTpl);\r
\r
  //\r
  // Fill Block IO protocol informations for the RAM disk\r
  //\r
  RamDiskInitBlockIo (PrivateData);\r
\r
  //\r
  // Install EFI_DEVICE_PATH_PROTOCOL & EFI_BLOCK_IO(2)_PROTOCOL on a new\r
  // handle\r
  //\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &PrivateData->Handle,\r
                  &gEfiBlockIoProtocolGuid,\r
                  &PrivateData->BlockIo,\r
                  &gEfiBlockIo2ProtocolGuid,\r
                  &PrivateData->BlockIo2,\r
                  &gEfiDevicePathProtocolGuid,\r
                  PrivateData->DevicePath,\r
                  NULL\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    goto ErrorExit;\r
  }\r
\r
  //\r
  // Insert the newly created one to the registered RAM disk list\r
  //\r
  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);\r
  InsertTailList (&RegisteredRamDisks, &PrivateData->ThisInstance);\r
  ListEntryNum++;\r
  gBS->RestoreTPL (OldTpl);\r
\r
  gBS->ConnectController (PrivateData->Handle, NULL, NULL, TRUE);\r
\r
  FreePool (RamDiskDevNode);\r
\r
  return EFI_SUCCESS;\r
\r
ErrorExit:\r
  if (RamDiskDevNode != NULL) {\r
    FreePool (RamDiskDevNode);\r
  }\r
\r
  if (PrivateData != NULL) {\r
    if (PrivateData->DevicePath) {\r
      FreePool (PrivateData->DevicePath);\r
    }\r
\r
    FreePool (PrivateData);\r
  }\r
\r
  return Status;\r
}\r
\r
\r
/**\r
  Unregister a RAM disk specified by DevicePath.\r
\r
  @param[in] DevicePath      A pointer to the device path that describes a RAM\r
                             Disk device.\r
\r
  @retval EFI_SUCCESS             The RAM disk is unregistered successfully.\r
  @retval EFI_INVALID_PARAMETER   DevicePath is NULL.\r
  @retval EFI_UNSUPPORTED         The device specified by DevicePath is not a\r
                                  valid ramdisk device path and not supported\r
                                  by the driver.\r
  @retval EFI_NOT_FOUND           The RAM disk pointed by DevicePath doesn't\r
                                  exist.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
RamDiskUnregister (\r
  IN  EFI_DEVICE_PATH_PROTOCOL    *DevicePath\r
  )\r
{\r
  LIST_ENTRY                      *Entry;\r
  LIST_ENTRY                      *NextEntry;\r
  BOOLEAN                         Found;\r
  UINT64                          StartingAddr;\r
  UINT64                          EndingAddr;\r
  EFI_DEVICE_PATH_PROTOCOL        *Header;\r
  MEDIA_RAM_DISK_DEVICE_PATH      *RamDiskDevNode;\r
  RAM_DISK_PRIVATE_DATA           *PrivateData;\r
  EFI_TPL                         OldTpl;\r
\r
  if (NULL == DevicePath) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  //\r
  // Locate the RAM disk device node.\r
  //\r
  RamDiskDevNode = NULL;\r
  Header         = DevicePath;\r
  do {\r
    //\r
    // Test if the current device node is a RAM disk.\r
    //\r
    if ((MEDIA_DEVICE_PATH == Header->Type) &&\r
      (MEDIA_RAM_DISK_DP == Header->SubType)) {\r
      RamDiskDevNode = (MEDIA_RAM_DISK_DEVICE_PATH *) Header;\r
\r
      break;\r
    }\r
\r
    Header = NextDevicePathNode (Header);\r
  } while ((Header->Type != END_DEVICE_PATH_TYPE));\r
\r
  if (NULL == RamDiskDevNode) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  Found          = FALSE;\r
  StartingAddr   = ReadUnaligned64 ((UINT64 *) &(RamDiskDevNode->StartingAddr[0]));\r
  EndingAddr     = ReadUnaligned64 ((UINT64 *) &(RamDiskDevNode->EndingAddr[0]));\r
\r
  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);\r
  if (!IsListEmpty(&RegisteredRamDisks)) {\r
    EFI_LIST_FOR_EACH_SAFE (Entry, NextEntry, &RegisteredRamDisks) {\r
      PrivateData = RAM_DISK_PRIVATE_FROM_THIS (Entry);\r
\r
      //\r
      // Unregister the RAM disk given by its starting address, ending address\r
      // and type guid.\r
      //\r
      if ((StartingAddr == PrivateData->StartingAddr) &&\r
          (EndingAddr == PrivateData->StartingAddr + PrivateData->Size) &&\r
          (CompareGuid (&RamDiskDevNode->TypeGuid, &PrivateData->TypeGuid))) {\r
        //\r
        // Uninstall the EFI_DEVICE_PATH_PROTOCOL & EFI_BLOCK_IO(2)_PROTOCOL\r
        //\r
        gBS->UninstallMultipleProtocolInterfaces (\r
               PrivateData->Handle,\r
               &gEfiBlockIoProtocolGuid,\r
               &PrivateData->BlockIo,\r
               &gEfiBlockIo2ProtocolGuid,\r
               &PrivateData->BlockIo2,\r
               &gEfiDevicePathProtocolGuid,\r
               DevicePath,\r
               NULL\r
               );\r
\r
        RemoveEntryList (&PrivateData->ThisInstance);\r
\r
        if (RamDiskCreateHii == PrivateData->CreateMethod) {\r
          //\r
          // If a RAM disk is created within HII, then the RamDiskDxe driver\r
          // driver is responsible for freeing the allocated memory for the\r
          // RAM disk.\r
          //\r
          FreePool ((VOID *)(UINTN) PrivateData->StartingAddr);\r
        }\r
\r
        FreePool (PrivateData->DevicePath);\r
        FreePool (PrivateData);\r
        ListEntryNum--;\r
        Found = TRUE;\r
\r
        break;\r
      }\r
    }\r
  }\r
  gBS->RestoreTPL (OldTpl);\r
\r
  if (TRUE == Found) {\r
    return EFI_SUCCESS;\r
  } else {\r
    return EFI_NOT_FOUND;\r
  }\r
}\r
Commit	Line	Data
20752cb8 HW	1	/** @file\r
	2	The realization of EFI_RAM_DISK_PROTOCOL.\r
	3	\r
	4	Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\r
	5	This program and the accompanying materials\r
	6	are licensed and made available under the terms and conditions of the BSD License\r
	7	which accompanies this distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
	15	#include "RamDiskImpl.h"\r
	16	\r
	17	RAM_DISK_PRIVATE_DATA mRamDiskPrivateDataTemplate = {\r
	18	RAM_DISK_PRIVATE_DATA_SIGNATURE,\r
	19	NULL\r
	20	};\r
	21	\r
	22	MEDIA_RAM_DISK_DEVICE_PATH mRamDiskDeviceNodeTemplate = {\r
	23	{\r
	24	MEDIA_DEVICE_PATH,\r
	25	MEDIA_RAM_DISK_DP,\r
	26	{\r
	27	(UINT8) (sizeof (MEDIA_RAM_DISK_DEVICE_PATH)),\r
	28	(UINT8) ((sizeof (MEDIA_RAM_DISK_DEVICE_PATH)) >> 8)\r
	29	}\r
	30	}\r
	31	};\r
	32	\r
	33	\r
	34	/**\r
	35	Initialize the RAM disk device node.\r
	36	\r
	37	@param[in] PrivateData Points to RAM disk private data.\r
	38	@param[in, out] RamDiskDevNode Points to the RAM disk device node.\r
	39	\r
	40	**/\r
	41	VOID\r
	42	RamDiskInitDeviceNode (\r
	43	IN RAM_DISK_PRIVATE_DATA *PrivateData,\r
	44	IN OUT MEDIA_RAM_DISK_DEVICE_PATH *RamDiskDevNode\r
	45	)\r
	46	{\r
	47	WriteUnaligned64 (\r
	48	(UINT64 *) &(RamDiskDevNode->StartingAddr[0]),\r
	49	(UINT64) PrivateData->StartingAddr\r
	50	);\r
	51	WriteUnaligned64 (\r
	52	(UINT64 *) &(RamDiskDevNode->EndingAddr[0]),\r
	53	(UINT64) PrivateData->StartingAddr + PrivateData->Size\r
	54	);\r
	55	CopyGuid (&RamDiskDevNode->TypeGuid, &PrivateData->TypeGuid);\r
	56	RamDiskDevNode->Instance = PrivateData->InstanceNumber;\r
	57	}\r
	58	\r
	59	\r
	60	/**\r
	61	Register a RAM disk with specified address, size and type.\r
	62	\r
	63	@param[in] RamDiskBase The base address of registered RAM disk.\r
	64	@param[in] RamDiskSize The size of registered RAM disk.\r
65	@param[in] RamDiskType The type of registered RAM disk. The GUID can be\r
66	any of the values defined in section 9.3.6.9, or a\r
67	vendor defined GUID.\r
68	@param[in] ParentDevicePath\r
69	Pointer to the parent device path. If there is no\r
70	parent device path then ParentDevicePath is NULL.\r
71	@param[out] DevicePath On return, points to a pointer to the device path\r
72	of the RAM disk device.\r
73	If ParentDevicePath is not NULL, the returned\r
74	DevicePath is created by appending a RAM disk node\r
75	to the parent device path. If ParentDevicePath is\r
76	NULL, the returned DevicePath is a RAM disk device\r
77	path without appending. This function is\r
78	responsible for allocating the buffer DevicePath\r
79	with the boot service AllocatePool().\r
80	\r
81	@retval EFI_SUCCESS The RAM disk is registered successfully.\r
82	@retval EFI_INVALID_PARAMETER DevicePath or RamDiskType is NULL.\r
83	RamDiskSize is 0.\r
84	@retval EFI_ALREADY_STARTED A Device Path Protocol instance to be created\r
85	is already present in the handle database.\r
86	@retval EFI_OUT_OF_RESOURCES The RAM disk register operation fails due to\r
87	resource limitation.\r
88	\r
89	**/\r
90	EFI_STATUS\r
91	EFIAPI\r
92	RamDiskRegister (\r
93	IN UINT64 RamDiskBase,\r
94	IN UINT64 RamDiskSize,\r
95	IN EFI_GUID *RamDiskType,\r
96	IN EFI_DEVICE_PATH *ParentDevicePath OPTIONAL,\r
97	OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath\r
98	)\r
99	{\r
100	EFI_STATUS Status;\r
101	RAM_DISK_PRIVATE_DATA *PrivateData;\r
102	RAM_DISK_PRIVATE_DATA *RegisteredPrivateData;\r
103	MEDIA_RAM_DISK_DEVICE_PATH *RamDiskDevNode;\r
104	UINTN DevicePathSize;\r
105	LIST_ENTRY *Entry;\r
106	EFI_TPL OldTpl;\r
107	\r
108	if ((0 == RamDiskSize) \|\| (NULL == RamDiskType) \|\| (NULL == DevicePath)) {\r
109	return EFI_INVALID_PARAMETER;\r
110	}\r
111	\r
112	//\r
113	// Add check to prevent data read across the memory boundary\r
114	//\r
115	if (RamDiskBase + RamDiskSize > ((UINTN) -1) - RAM_DISK_BLOCK_SIZE + 1) {\r
116	return EFI_INVALID_PARAMETER;\r
117	}\r
118	\r
119	RamDiskDevNode = NULL;\r
120	\r
121	//\r
122	// Create a new RAM disk instance and initialize its private data\r
123	//\r
124	PrivateData = AllocateCopyPool (\r
125	sizeof (RAM_DISK_PRIVATE_DATA),\r
126	&mRamDiskPrivateDataTemplate\r
127	);\r
128	if (NULL == PrivateData) {\r
129	return EFI_OUT_OF_RESOURCES;\r
130	}\r
131	\r
132	PrivateData->StartingAddr = RamDiskBase;\r
133	PrivateData->Size = RamDiskSize;\r
134	CopyGuid (&PrivateData->TypeGuid, RamDiskType);\r
135	InitializeListHead (&PrivateData->ThisInstance);\r
136	\r
137	//\r
138	// Generate device path information for the registered RAM disk\r
139	//\r
140	RamDiskDevNode = AllocateCopyPool (\r
141	sizeof (MEDIA_RAM_DISK_DEVICE_PATH),\r
142	&mRamDiskDeviceNodeTemplate\r
143	);\r
144	if (NULL == RamDiskDevNode) {\r
145	Status = EFI_OUT_OF_RESOURCES;\r
146	goto ErrorExit;\r
147	}\r
148	\r
149	RamDiskInitDeviceNode (PrivateData, RamDiskDevNode);\r
150	\r
151	*DevicePath = AppendDevicePathNode (\r
152	ParentDevicePath,\r
153	(EFI_DEVICE_PATH_PROTOCOL *) RamDiskDevNode\r
154	);\r
155	if (NULL == *DevicePath) {\r
156	Status = EFI_OUT_OF_RESOURCES;\r
157	goto ErrorExit;\r
158	}\r
159	\r
160	PrivateData->DevicePath = *DevicePath;\r
161	\r
162	//\r
163	// Check whether the created device path is already present in the handle\r
164	// database\r
165	//\r
166	OldTpl = gBS->RaiseTPL (TPL_NOTIFY);\r
167	if (!IsListEmpty(&RegisteredRamDisks)) {\r
168	DevicePathSize = GetDevicePathSize (PrivateData->DevicePath);\r
169	\r
170	EFI_LIST_FOR_EACH (Entry, &RegisteredRamDisks) {\r
171	RegisteredPrivateData = RAM_DISK_PRIVATE_FROM_THIS (Entry);\r
172	if (DevicePathSize == GetDevicePathSize (RegisteredPrivateData->DevicePath)) {\r
173	//\r
174	// Compare device path\r
175	//\r
176	if ((CompareMem (\r
177	PrivateData->DevicePath,\r
178	RegisteredPrivateData->DevicePath,\r
179	DevicePathSize)) == 0) {\r
180	*DevicePath = NULL;\r
181	Status = EFI_ALREADY_STARTED;\r
182	goto ErrorExit;\r
183	}\r
184	}\r
185	}\r
186	}\r
187	gBS->RestoreTPL (OldTpl);\r
188	\r
189	//\r
190	// Fill Block IO protocol informations for the RAM disk\r
191	//\r
192	RamDiskInitBlockIo (PrivateData);\r
193	\r
194	//\r
216fefa3	195	// Install EFI_DEVICE_PATH_PROTOCOL & EFI_BLOCK_IO(2)_PROTOCOL on a new\r
20752cb8 HW	196	// handle\r
	197	//\r
	198	Status = gBS->InstallMultipleProtocolInterfaces (\r
	199	&PrivateData->Handle,\r
	200	&gEfiBlockIoProtocolGuid,\r
	201	&PrivateData->BlockIo,\r
216fefa3 HW	202	&gEfiBlockIo2ProtocolGuid,\r
216fefa3 HW	203	&PrivateData->BlockIo2,\r
20752cb8 HW	204	&gEfiDevicePathProtocolGuid,\r
	205	PrivateData->DevicePath,\r
	206	NULL\r
	207	);\r
	208	if (EFI_ERROR (Status)) {\r
	209	goto ErrorExit;\r
	210	}\r
	211	\r
	212	//\r
	213	// Insert the newly created one to the registered RAM disk list\r
	214	//\r
	215	OldTpl = gBS->RaiseTPL (TPL_NOTIFY);\r
	216	InsertTailList (&RegisteredRamDisks, &PrivateData->ThisInstance);\r
	217	ListEntryNum++;\r
	218	gBS->RestoreTPL (OldTpl);\r
	219	\r
	220	gBS->ConnectController (PrivateData->Handle, NULL, NULL, TRUE);\r
	221	\r
	222	FreePool (RamDiskDevNode);\r
	223	\r
	224	return EFI_SUCCESS;\r
	225	\r
	226	ErrorExit:\r
	227	if (RamDiskDevNode != NULL) {\r
	228	FreePool (RamDiskDevNode);\r
	229	}\r
	230	\r
	231	if (PrivateData != NULL) {\r
	232	if (PrivateData->DevicePath) {\r
	233	FreePool (PrivateData->DevicePath);\r
	234	}\r
	235	\r
	236	FreePool (PrivateData);\r
	237	}\r
	238	\r
	239	return Status;\r
	240	}\r
	241	\r
	242	\r
	243	/**\r
	244	Unregister a RAM disk specified by DevicePath.\r
	245	\r
	246	@param[in] DevicePath A pointer to the device path that describes a RAM\r
	247	Disk device.\r
	248	\r
	249	@retval EFI_SUCCESS The RAM disk is unregistered successfully.\r
	250	@retval EFI_INVALID_PARAMETER DevicePath is NULL.\r
	251	@retval EFI_UNSUPPORTED The device specified by DevicePath is not a\r
	252	valid ramdisk device path and not supported\r
	253	by the driver.\r
	254	@retval EFI_NOT_FOUND The RAM disk pointed by DevicePath doesn't\r
	255	exist.\r
	256	\r
	257	**/\r
	258	EFI_STATUS\r
	259	EFIAPI\r
	260	RamDiskUnregister (\r
	261	IN EFI_DEVICE_PATH_PROTOCOL *DevicePath\r
	262	)\r
	263	{\r
	264	LIST_ENTRY *Entry;\r
	265	LIST_ENTRY *NextEntry;\r
	266	BOOLEAN Found;\r
	267	UINT64 StartingAddr;\r
268	UINT64 EndingAddr;\r
269	EFI_DEVICE_PATH_PROTOCOL *Header;\r
270	MEDIA_RAM_DISK_DEVICE_PATH *RamDiskDevNode;\r
271	RAM_DISK_PRIVATE_DATA *PrivateData;\r
272	EFI_TPL OldTpl;\r
273	\r
274	if (NULL == DevicePath) {\r
275	return EFI_INVALID_PARAMETER;\r
276	}\r
277	\r
278	//\r
279	// Locate the RAM disk device node.\r
280	//\r
281	RamDiskDevNode = NULL;\r
282	Header = DevicePath;\r
283	do {\r
284	//\r
285	// Test if the current device node is a RAM disk.\r
286	//\r
287	if ((MEDIA_DEVICE_PATH == Header->Type) &&\r
288	(MEDIA_RAM_DISK_DP == Header->SubType)) {\r
289	RamDiskDevNode = (MEDIA_RAM_DISK_DEVICE_PATH *) Header;\r
290	\r
291	break;\r
292	}\r
293	\r
294	Header = NextDevicePathNode (Header);\r
295	} while ((Header->Type != END_DEVICE_PATH_TYPE));\r
296	\r
297	if (NULL == RamDiskDevNode) {\r
298	return EFI_UNSUPPORTED;\r
299	}\r
300	\r
301	Found = FALSE;\r
302	StartingAddr = ReadUnaligned64 ((UINT64 *) &(RamDiskDevNode->StartingAddr[0]));\r
303	EndingAddr = ReadUnaligned64 ((UINT64 *) &(RamDiskDevNode->EndingAddr[0]));\r
304	\r
305	OldTpl = gBS->RaiseTPL (TPL_NOTIFY);\r
306	if (!IsListEmpty(&RegisteredRamDisks)) {\r
307	EFI_LIST_FOR_EACH_SAFE (Entry, NextEntry, &RegisteredRamDisks) {\r
308	PrivateData = RAM_DISK_PRIVATE_FROM_THIS (Entry);\r
309	\r
310	//\r
311	// Unregister the RAM disk given by its starting address, ending address\r
312	// and type guid.\r
313	//\r
314	if ((StartingAddr == PrivateData->StartingAddr) &&\r
315	(EndingAddr == PrivateData->StartingAddr + PrivateData->Size) &&\r
316	(CompareGuid (&RamDiskDevNode->TypeGuid, &PrivateData->TypeGuid))) {\r
317	//\r
216fefa3	318	// Uninstall the EFI_DEVICE_PATH_PROTOCOL & EFI_BLOCK_IO(2)_PROTOCOL\r
20752cb8 HW	319	//\r
	320	gBS->UninstallMultipleProtocolInterfaces (\r
	321	PrivateData->Handle,\r
	322	&gEfiBlockIoProtocolGuid,\r
	323	&PrivateData->BlockIo,\r
216fefa3 HW	324	&gEfiBlockIo2ProtocolGuid,\r
216fefa3 HW	325	&PrivateData->BlockIo2,\r
20752cb8 HW	326	&gEfiDevicePathProtocolGuid,\r
	327	DevicePath,\r
	328	NULL\r
	329	);\r
	330	\r
	331	RemoveEntryList (&PrivateData->ThisInstance);\r
	332	\r
	333	if (RamDiskCreateHii == PrivateData->CreateMethod) {\r
	334	//\r
	335	// If a RAM disk is created within HII, then the RamDiskDxe driver\r
	336	// driver is responsible for freeing the allocated memory for the\r
	337	// RAM disk.\r
	338	//\r
	339	FreePool ((VOID *)(UINTN) PrivateData->StartingAddr);\r
	340	}\r
	341	\r
20752cb8 HW	342	FreePool (PrivateData->DevicePath);\r
	343	FreePool (PrivateData);\r
	344	ListEntryNum--;\r
	345	Found = TRUE;\r
	346	\r
	347	break;\r
	348	}\r
	349	}\r
	350	}\r
	351	gBS->RestoreTPL (OldTpl);\r
	352	\r
	353	if (TRUE == Found) {\r
	354	return EFI_SUCCESS;\r
	355	} else {\r
	356	return EFI_NOT_FOUND;\r
	357	}\r
	358	}\r