[mirror_edk2.git] / IntelFrameworkPkg / Include / Protocol / SmmBase.h

/** @file\r
  This file declares SMM Base abstraction protocol.\r
  This is the base level of compatiblity for SMM drivers.\r
\r
  Copyright (c) 2007, Intel Corporation\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
  Module Name:  SmmBase.h\r
\r
  @par Revision Reference:\r
  This Protocol is defined in Framework of EFI SMM Core Interface Spec\r
  Version 0.9.\r
\r
**/\r
\r
#ifndef _SMM_BASE_H_\r
#define _SMM_BASE_H_\r
\r
#include <FrameworkSmm.h>\r
\r
#define EFI_SMM_BASE_PROTOCOL_GUID \\r
  { \\r
    0x1390954D, 0xda95, 0x4227, {0x93, 0x28, 0x72, 0x82, 0xc2, 0x17, 0xda, 0xa8 } \\r
  }\r
\r
typedef struct _EFI_SMM_BASE_PROTOCOL             EFI_SMM_BASE_PROTOCOL;\r
\r
//\r
// SMM Handler Definition\r
//\r
#define EFI_HANDLER_SUCCESS         0x0000\r
#define EFI_HANDLER_CRITICAL_EXIT   0x0001\r
#define EFI_HANDLER_SOURCE_QUIESCED 0x0002\r
#define EFI_HANDLER_SOURCE_PENDING  0x0003\r
\r
/**\r
  Entry Point to Callback service\r
\r
  @param  SmmImageHandle        A handle allocated by the SMM infrastructure code\r
                                to uniquely designate a specific DXE SMM driver.\r
  @param  CommunicationBuffer   A pointer to a collection of data in memory\r
                                that will be conveyed from a non-SMM environment into an SMM environment.\r
                                The buffer must be contiguous, physically mapped, and be a physical address.\r
  @param  SourceSize            The size of the CommunicationBuffer.\r
\r
  @return Status code\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_CALLBACK_ENTRY_POINT) (\r
  IN EFI_HANDLE             SmmImageHandle,\r
  IN OUT VOID               *CommunicationBuffer OPTIONAL,\r
  IN OUT UINTN              *SourceSize OPTIONAL\r
  );\r
\r
//\r
// SMM Base Protocol Definition\r
//\r
/**\r
  Register a given driver into SMRAM.This is the equivalent of performing\r
  the LoadImage/StartImage into System Management Mode.\r
\r
  @param  This                  Protocol instance pointer.\r
  @param  FilePath              Location of the image to be installed as the handler.\r
  @param  SourceBuffer          Optional source buffer in case of the image file\r
                                being in memory.\r
  @param  SourceSize            Size of the source image file, if in memory.\r
  @param  ImageHandle           Pointer to the handle that reflects the driver\r
                                loaded into SMM.\r
  @param  LegacyIA32Binary      The binary image to load is legacy 16 bit code.\r
\r
  @retval EFI_SUCCESS           The operation was successful.\r
  @retval EFI_OUT_OF_RESOURCES  There were no additional SMRAM resources to load the handler\r
  @retval EFI_UNSUPPORTED       This platform does not support 16-bit handlers.\r
  @retval EFI_UNSUPPORTED       In runtime.\r
  @retval EFI_INVALID_PARAMETER The handlers was not the correct image type\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_REGISTER_HANDLER) (\r
  IN EFI_SMM_BASE_PROTOCOL                           *This,\r
  IN  EFI_DEVICE_PATH_PROTOCOL                       *FilePath,\r
  IN  VOID                                           *SourceBuffer OPTIONAL,\r
  IN  UINTN                                          SourceSize,\r
  OUT EFI_HANDLE                                     *ImageHandle,\r
  IN  BOOLEAN                                        LegacyIA32Binary OPTIONAL\r
  )\r
;\r
\r
/**\r
  Remove a given driver SMRAM.  This is the equivalent of performing\r
  the UnloadImage System Management Mode.\r
\r
  @param  This                  Protocol instance pointer.\r
  @param  ImageHandle           Pointer to the handle that reflects the driver\r
                                loaded into SMM.\r
\r
  @retval EFI_SUCCESS           The operation was successful\r
  @retval EFI_INVALID_PARAMETER The handler did not exist\r
  @retval EFI_UNSUPPORTED       In runtime.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_UNREGISTER_HANDLER) (\r
  IN EFI_SMM_BASE_PROTOCOL          *This,\r
  IN EFI_HANDLE                     ImageHandle\r
  )\r
;\r
\r
/**\r
  The SMM Inter-module Communicate Service Communicate() function\r
  provides a services to send/received messages from a registered\r
  EFI service.  The BASE protocol driver is responsible for doing\r
  any of the copies such that the data lives in boot-service accessible RAM.\r
\r
  @param  This                  Protocol instance pointer.\r
  @param  ImageHandle           Pointer to the handle that reflects the driver\r
                                loaded into SMM.\r
  @param  CommunicationBuffer   Pointer to the buffer to convey into SMRAM.\r
  @param  SourceSize            Size of the contents of buffer..\r
\r
  @retval EFI_SUCCESS           The message was successfully posted\r
  @retval EFI_INVALID_PARAMETER The buffer was NULL\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_COMMUNICATE) (\r
  IN EFI_SMM_BASE_PROTOCOL          *This,\r
  IN EFI_HANDLE                     ImageHandle,\r
  IN OUT VOID                       *CommunicationBuffer,\r
  IN OUT UINTN                      *SourceSize\r
  )\r
;\r
\r
/**\r
  Register a callback to execute within SMM.\r
  This allows receipt of messages created with the Boot Service COMMUNICATE.\r
\r
  @param  This                  Protocol instance pointer.\r
  @param  CallbackAddress       Address of the callback service\r
  @param  MakeFirst             If present, will stipulate that the handler is posted\r
                                to be the first module executed in the dispatch table.\r
  @param  MakeLast              If present, will stipulate that the handler is posted\r
                                to be last executed in the dispatch table.\r
  @param  FloatingPointSave     This is an optional parameter which informs the\r
                                EFI_SMM_ACCESS_PROTOCOL Driver core if it needs to save\r
                                the floating point register state. If any of the handlers\r
                                require this, then the state will be saved for all of the handlers.\r
\r
  @retval EFI_SUCCESS           The operation was successful\r
  @retval EFI_OUT_OF_RESOURCES  Not enough space in the dispatch queue\r
  @retval EFI_UNSUPPORTED       In runtime.\r
  @retval EFI_UNSUPPORTED       Not in SMM.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_CALLBACK_SERVICE) (\r
  IN EFI_SMM_BASE_PROTOCOL                            *This,\r
  IN EFI_HANDLE                                       SmmImageHandle,\r
  IN EFI_SMM_CALLBACK_ENTRY_POINT                     CallbackAddress,\r
  IN BOOLEAN                                          MakeLast OPTIONAL,\r
  IN BOOLEAN                                          FloatingPointSave OPTIONAL\r
  )\r
;\r
\r
/**\r
  The SmmAllocatePool() function allocates a memory region of Size bytes from memory of\r
  type PoolType and returns the address of the allocated memory in the location referenced\r
  by Buffer.  This function allocates pages from EFI SMRAM Memory as needed to grow the\r
  requested pool type.  All allocations are eight-byte aligned.\r
\r
  @param  This                  Protocol instance pointer.\r
  @param  PoolType              The type of pool to allocate.\r
                                The only supported type is EfiRuntimeServicesData;\r
                                the interface will internally map this runtime request to SMRAM.\r
  @param  Size                  The number of bytes to allocate from the pool.\r
  @param  Buffer                A pointer to a pointer to the allocated buffer if the call\r
                                succeeds; undefined otherwise.\r
\r
  @retval EFI_SUCCESS           The requested number of bytes was allocated.\r
  @retval EFI_OUT_OF_RESOURCES  The pool requested could not be allocated.\r
  @retval EFI_INVALID_PARAMETER PoolType was invalid.\r
  @retval EFI_UNSUPPORTED       In runtime.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_ALLOCATE_POOL) (\r
  IN EFI_SMM_BASE_PROTOCOL          *This,\r
  IN EFI_MEMORY_TYPE                PoolType,\r
  IN UINTN                          Size,\r
  OUT VOID                          **Buffer\r
  )\r
;\r
\r
/**\r
  The SmmFreePool() function returns the memory specified by Buffer to the system.\r
  On return, the memory's type is EFI SMRAM Memory.  The Buffer that is freed must\r
  have been allocated by SmmAllocatePool().\r
\r
  @param  This                  Protocol instance pointer.\r
  @param  Buffer                Pointer to the buffer allocation.\r
\r
  @retval EFI_SUCCESS           The memory was returned to the system.\r
  @retval EFI_INVALID_PARAMETER Buffer was invalid.\r
  @retval EFI_UNSUPPORTED       In runtime.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_FREE_POOL) (\r
  IN EFI_SMM_BASE_PROTOCOL          *This,\r
  IN VOID                           *Buffer\r
  )\r
;\r
\r
/**\r
  This routine tells caller if execution context is SMM or not.\r
\r
  @param  This                  Protocol instance pointer.\r
  @param  InSmm                 Whether the caller is inside SMM for IA-32 or servicing a PMI for the Itanium processor family.\r
\r
  @retval EFI_SUCCESS           The operation was successful\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_INSIDE_OUT) (\r
  IN EFI_SMM_BASE_PROTOCOL          *This,\r
  OUT BOOLEAN                       *InSmm\r
  )\r
;\r
\r
/**\r
  The GetSmstLocation() function returns the locatin of the System Management\r
  Service Table.  The use of the API is such that a driver can discover the\r
  location of the SMST in its entry point and then cache it in some driver\r
  global variable so that the SMST can be invoked in subsequent callbacks.\r
\r
  @param  This                  Protocol instance pointer.\r
  @param  Smst                  Pointer to the SMST.\r
\r
  @retval EFI_SUCCESS           The operation was successful\r
  @retval EFI_INVALID_PARAMETER Smst was invalid.\r
  @retval EFI_UNSUPPORTED       Not in SMM.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_GET_SMST_LOCATION) (\r
  IN EFI_SMM_BASE_PROTOCOL          *This,\r
  IN OUT EFI_SMM_SYSTEM_TABLE       **Smst\r
  )\r
;\r
\r
/**\r
  @par Protocol Description:\r
  This protocol is used to install SMM handlers for support of subsequent SMI/PMI\r
  activations. This protocol is available on both IA-32 and Itanium-based systems.\r
\r
  @param Register\r
  Registers a handler to run in System Management RAM (SMRAM).\r
\r
  @param UnRegister\r
  Removes a handler from execution in SMRAM.\r
\r
  @param Communicate\r
  Sends/receives a message for a registered handler.\r
\r
  @param RegisterCallback\r
  Registers a callback from the constructor.\r
\r
  @param InSmm\r
  Detects whether the caller is inside or outside of SMM. SName\r
\r
  @param SmmAllocatePool\r
  Allocates SMRAM.\r
\r
  @param SmmFreePool\r
  Deallocates SMRAM.\r
\r
  @param GetSmstLocation\r
  Retrieves the location of the System Management System Table (SMST).\r
\r
**/\r
struct _EFI_SMM_BASE_PROTOCOL {\r
  EFI_SMM_REGISTER_HANDLER    Register;\r
  EFI_SMM_UNREGISTER_HANDLER  UnRegister;\r
  EFI_SMM_COMMUNICATE         Communicate;\r
  EFI_SMM_CALLBACK_SERVICE    RegisterCallback;\r
  EFI_SMM_INSIDE_OUT          InSmm;\r
  EFI_SMM_ALLOCATE_POOL       SmmAllocatePool;\r
  EFI_SMM_FREE_POOL           SmmFreePool;\r
  EFI_SMM_GET_SMST_LOCATION   GetSmstLocation;\r
};\r
\r
extern EFI_GUID gEfiSmmBaseProtocolGuid;\r
\r
#endif\r
Commit	Line	Data
79964ac8	1	/** @file\r
	2	This file declares SMM Base abstraction protocol.\r
	3	This is the base level of compatiblity for SMM drivers.\r
	4	\r
	5	Copyright (c) 2007, Intel Corporation\r
	6	All rights reserved. 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	Module Name: SmmBase.h\r
	15	\r
	16	@par Revision Reference:\r
	17	This Protocol is defined in Framework of EFI SMM Core Interface Spec\r
	18	Version 0.9.\r
	19	\r
	20	**/\r
	21	\r
	22	#ifndef _SMM_BASE_H_\r
	23	#define _SMM_BASE_H_\r
	24	\r
b80fbe85	25	#include <FrameworkSmm.h>\r
b80fbe85	26	\r
79964ac8	27	#define EFI_SMM_BASE_PROTOCOL_GUID \\r
	28	{ \\r
	29	0x1390954D, 0xda95, 0x4227, {0x93, 0x28, 0x72, 0x82, 0xc2, 0x17, 0xda, 0xa8 } \\r
	30	}\r
	31	\r
	32	typedef struct _EFI_SMM_BASE_PROTOCOL EFI_SMM_BASE_PROTOCOL;\r
	33	\r
	34	//\r
	35	// SMM Handler Definition\r
	36	//\r
	37	#define EFI_HANDLER_SUCCESS 0x0000\r
	38	#define EFI_HANDLER_CRITICAL_EXIT 0x0001\r
	39	#define EFI_HANDLER_SOURCE_QUIESCED 0x0002\r
	40	#define EFI_HANDLER_SOURCE_PENDING 0x0003\r
	41	\r
	42	/**\r
	43	Entry Point to Callback service\r
	44	\r
	45	@param SmmImageHandle A handle allocated by the SMM infrastructure code\r
	46	to uniquely designate a specific DXE SMM driver.\r
	47	@param CommunicationBuffer A pointer to a collection of data in memory\r
	48	that will be conveyed from a non-SMM environment into an SMM environment.\r
	49	The buffer must be contiguous, physically mapped, and be a physical address.\r
	50	@param SourceSize The size of the CommunicationBuffer.\r
	51	\r
	52	@return Status code\r
	53	\r
	54	**/\r
	55	typedef\r
	56	EFI_STATUS\r
	57	(EFIAPI *EFI_SMM_CALLBACK_ENTRY_POINT) (\r
	58	IN EFI_HANDLE SmmImageHandle,\r
	59	IN OUT VOID *CommunicationBuffer OPTIONAL,\r
	60	IN OUT UINTN *SourceSize OPTIONAL\r
	61	);\r
	62	\r
	63	//\r
	64	// SMM Base Protocol Definition\r
	65	//\r
	66	/**\r
	67	Register a given driver into SMRAM.This is the equivalent of performing\r
	68	the LoadImage/StartImage into System Management Mode.\r
	69	\r
	70	@param This Protocol instance pointer.\r
	71	@param FilePath Location of the image to be installed as the handler.\r
	72	@param SourceBuffer Optional source buffer in case of the image file\r
	73	being in memory.\r
	74	@param SourceSize Size of the source image file, if in memory.\r
	75	@param ImageHandle Pointer to the handle that reflects the driver\r
	76	loaded into SMM.\r
	77	@param LegacyIA32Binary The binary image to load is legacy 16 bit code.\r
	78	\r
	79	@retval EFI_SUCCESS The operation was successful.\r
	80	@retval EFI_OUT_OF_RESOURCES There were no additional SMRAM resources to load the handler\r
	81	@retval EFI_UNSUPPORTED This platform does not support 16-bit handlers.\r
	82	@retval EFI_UNSUPPORTED In runtime.\r
	83	@retval EFI_INVALID_PARAMETER The handlers was not the correct image type\r
	84	\r
	85	**/\r
	86	typedef\r
	87	EFI_STATUS\r
	88	(EFIAPI *EFI_SMM_REGISTER_HANDLER) (\r
	89	IN EFI_SMM_BASE_PROTOCOL *This,\r
	90	IN EFI_DEVICE_PATH_PROTOCOL *FilePath,\r
91	IN VOID *SourceBuffer OPTIONAL,\r
92	IN UINTN SourceSize,\r
93	OUT EFI_HANDLE *ImageHandle,\r
94	IN BOOLEAN LegacyIA32Binary OPTIONAL\r
95	)\r
96	;\r
97	\r
98	/**\r
99	Remove a given driver SMRAM. This is the equivalent of performing\r
100	the UnloadImage System Management Mode.\r
101	\r
102	@param This Protocol instance pointer.\r
103	@param ImageHandle Pointer to the handle that reflects the driver\r
104	loaded into SMM.\r
105	\r
106	@retval EFI_SUCCESS The operation was successful\r
107	@retval EFI_INVALID_PARAMETER The handler did not exist\r
108	@retval EFI_UNSUPPORTED In runtime.\r
109	\r
110	**/\r
111	typedef\r
112	EFI_STATUS\r
113	(EFIAPI *EFI_SMM_UNREGISTER_HANDLER) (\r
114	IN EFI_SMM_BASE_PROTOCOL *This,\r
115	IN EFI_HANDLE ImageHandle\r
116	)\r
117	;\r
118	\r
119	/**\r
120	The SMM Inter-module Communicate Service Communicate() function\r
121	provides a services to send/received messages from a registered\r
122	EFI service. The BASE protocol driver is responsible for doing\r
123	any of the copies such that the data lives in boot-service accessible RAM.\r
124	\r
125	@param This Protocol instance pointer.\r
126	@param ImageHandle Pointer to the handle that reflects the driver\r
127	loaded into SMM.\r
128	@param CommunicationBuffer Pointer to the buffer to convey into SMRAM.\r
129	@param SourceSize Size of the contents of buffer..\r
130	\r
131	@retval EFI_SUCCESS The message was successfully posted\r
132	@retval EFI_INVALID_PARAMETER The buffer was NULL\r
133	\r
134	**/\r
135	typedef\r
136	EFI_STATUS\r
137	(EFIAPI *EFI_SMM_COMMUNICATE) (\r
138	IN EFI_SMM_BASE_PROTOCOL *This,\r
139	IN EFI_HANDLE ImageHandle,\r
140	IN OUT VOID *CommunicationBuffer,\r
141	IN OUT UINTN *SourceSize\r
142	)\r
143	;\r
144	\r
145	/**\r
146	Register a callback to execute within SMM.\r
147	This allows receipt of messages created with the Boot Service COMMUNICATE.\r
148	\r
149	@param This Protocol instance pointer.\r
150	@param CallbackAddress Address of the callback service\r
151	@param MakeFirst If present, will stipulate that the handler is posted\r
152	to be the first module executed in the dispatch table.\r
153	@param MakeLast If present, will stipulate that the handler is posted\r
154	to be last executed in the dispatch table.\r
155	@param FloatingPointSave This is an optional parameter which informs the\r
156	EFI_SMM_ACCESS_PROTOCOL Driver core if it needs to save\r
157	the floating point register state. If any of the handlers\r
158	require this, then the state will be saved for all of the handlers.\r
159	\r
160	@retval EFI_SUCCESS The operation was successful\r
161	@retval EFI_OUT_OF_RESOURCES Not enough space in the dispatch queue\r
162	@retval EFI_UNSUPPORTED In runtime.\r
163	@retval EFI_UNSUPPORTED Not in SMM.\r
164	\r
165	**/\r
166	typedef\r
167	EFI_STATUS\r
168	(EFIAPI *EFI_SMM_CALLBACK_SERVICE) (\r
169	IN EFI_SMM_BASE_PROTOCOL *This,\r
170	IN EFI_HANDLE SmmImageHandle,\r
171	IN EFI_SMM_CALLBACK_ENTRY_POINT CallbackAddress,\r
172	IN BOOLEAN MakeLast OPTIONAL,\r
173	IN BOOLEAN FloatingPointSave OPTIONAL\r
174	)\r
175	;\r
176	\r
177	/**\r
178	The SmmAllocatePool() function allocates a memory region of Size bytes from memory of\r
179	type PoolType and returns the address of the allocated memory in the location referenced\r
180	by Buffer. This function allocates pages from EFI SMRAM Memory as needed to grow the\r
181	requested pool type. All allocations are eight-byte aligned.\r
182	\r
183	@param This Protocol instance pointer.\r
184	@param PoolType The type of pool to allocate.\r
185	The only supported type is EfiRuntimeServicesData;\r
186	the interface will internally map this runtime request to SMRAM.\r
187	@param Size The number of bytes to allocate from the pool.\r
188	@param Buffer A pointer to a pointer to the allocated buffer if the call\r
189	succeeds; undefined otherwise.\r
190	\r
191	@retval EFI_SUCCESS The requested number of bytes was allocated.\r
192	@retval EFI_OUT_OF_RESOURCES The pool requested could not be allocated.\r
193	@retval EFI_INVALID_PARAMETER PoolType was invalid.\r
194	@retval EFI_UNSUPPORTED In runtime.\r
195	\r
196	**/\r
197	typedef\r
198	EFI_STATUS\r
199	(EFIAPI *EFI_SMM_ALLOCATE_POOL) (\r
200	IN EFI_SMM_BASE_PROTOCOL *This,\r
201	IN EFI_MEMORY_TYPE PoolType,\r
202	IN UINTN Size,\r
203	OUT VOID **Buffer\r
204	)\r
205	;\r
206	\r
207	/**\r
208	The SmmFreePool() function returns the memory specified by Buffer to the system.\r
209	On return, the memory's type is EFI SMRAM Memory. The Buffer that is freed must\r
210	have been allocated by SmmAllocatePool().\r
211	\r
212	@param This Protocol instance pointer.\r
213	@param Buffer Pointer to the buffer allocation.\r
214	\r
215	@retval EFI_SUCCESS The memory was returned to the system.\r
216	@retval EFI_INVALID_PARAMETER Buffer was invalid.\r
217	@retval EFI_UNSUPPORTED In runtime.\r
218	\r
219	**/\r
220	typedef\r
221	EFI_STATUS\r
222	(EFIAPI *EFI_SMM_FREE_POOL) (\r
223	IN EFI_SMM_BASE_PROTOCOL *This,\r
224	IN VOID *Buffer\r
225	)\r
226	;\r
227	\r
228	/**\r
229	This routine tells caller if execution context is SMM or not.\r
230	\r
231	@param This Protocol instance pointer.\r
232	@param InSmm Whether the caller is inside SMM for IA-32 or servicing a PMI for the Itanium processor family.\r
233	\r
234	@retval EFI_SUCCESS The operation was successful\r
235	\r
236	**/\r
237	typedef\r
238	EFI_STATUS\r
239	(EFIAPI *EFI_SMM_INSIDE_OUT) (\r
240	IN EFI_SMM_BASE_PROTOCOL *This,\r
241	OUT BOOLEAN *InSmm\r
242	)\r
243	;\r
244	\r
245	/**\r
246	The GetSmstLocation() function returns the locatin of the System Management\r
247	Service Table. The use of the API is such that a driver can discover the\r
248	location of the SMST in its entry point and then cache it in some driver\r
249	global variable so that the SMST can be invoked in subsequent callbacks.\r
250	\r
251	@param This Protocol instance pointer.\r
252	@param Smst Pointer to the SMST.\r
253	\r
254	@retval EFI_SUCCESS The operation was successful\r
255	@retval EFI_INVALID_PARAMETER Smst was invalid.\r
256	@retval EFI_UNSUPPORTED Not in SMM.\r
257	\r
258	**/\r
259	typedef\r
260	EFI_STATUS\r
261	(EFIAPI *EFI_SMM_GET_SMST_LOCATION) (\r
262	IN EFI_SMM_BASE_PROTOCOL *This,\r
263	IN OUT EFI_SMM_SYSTEM_TABLE **Smst\r
264	)\r
265	;\r
266	\r
267	/**\r
268	@par Protocol Description:\r
269	This protocol is used to install SMM handlers for support of subsequent SMI/PMI\r
270	activations. This protocol is available on both IA-32 and Itanium-based systems.\r
271	\r
272	@param Register\r
273	Registers a handler to run in System Management RAM (SMRAM).\r
274	\r
275	@param UnRegister\r
276	Removes a handler from execution in SMRAM.\r
277	\r
278	@param Communicate\r
279	Sends/receives a message for a registered handler.\r
280	\r
281	@param RegisterCallback\r
282	Registers a callback from the constructor.\r
283	\r
284	@param InSmm\r
285	Detects whether the caller is inside or outside of SMM. SName\r
286	\r
287	@param SmmAllocatePool\r
288	Allocates SMRAM.\r
289	\r
290	@param SmmFreePool\r
291	Deallocates SMRAM.\r
292	\r
293	@param GetSmstLocation\r
294	Retrieves the location of the System Management System Table (SMST).\r
295	\r
296	**/\r
297	struct _EFI_SMM_BASE_PROTOCOL {\r
298	EFI_SMM_REGISTER_HANDLER Register;\r
299	EFI_SMM_UNREGISTER_HANDLER UnRegister;\r
300	EFI_SMM_COMMUNICATE Communicate;\r
301	EFI_SMM_CALLBACK_SERVICE RegisterCallback;\r
302	EFI_SMM_INSIDE_OUT InSmm;\r
303	EFI_SMM_ALLOCATE_POOL SmmAllocatePool;\r
304	EFI_SMM_FREE_POOL SmmFreePool;\r
305	EFI_SMM_GET_SMST_LOCATION GetSmstLocation;\r
306	};\r
307	\r
308	extern EFI_GUID gEfiSmmBaseProtocolGuid;\r
309	\r
310	#endif\r