2 This file declares SMM Base abstraction protocol.
3 This protocol is used to install SMM handlers for support of subsequent SMI/PMI activations. This
4 protocol is available on both IA-32 and Itanium based systems.
6 The EFI_SMM_BASE_PROTOCOL is a set of services that is exported by a processor device. It is
7 a required protocol for the platform processor. This protocol can be used in both boot services and
8 runtime mode. However, only the following member functions need to exist into runtime:
11 This protocol is responsible for registering the handler services. The order in which the handlers are
12 executed is prescribed only with respect to the MakeLast flag in the RegisterCallback()
13 service. The driver exports these registration and unregistration services in boot services mode, but
14 the registered handlers will execute through the preboot and runtime. The only way to change the
15 behavior of a registered driver after ExitBootServices() has been invoked is to use some
16 private communication mechanism with the driver to order it to quiesce. This model permits typical
17 use cases, such as invoking the handler to enter ACPI mode, where the OS loader would make this
18 call before boot services are terminated. On the other hand, handlers for services such as chipset
19 workarounds for the century rollover in CMOS should provide commensurate services throughout
20 preboot and OS runtime.
22 Copyright (c) 2007, Intel Corporation
23 All rights reserved. This program and the accompanying materials
24 are licensed and made available under the terms and conditions of the BSD License
25 which accompanies this distribution. The full text of the license may be found at
26 http://opensource.org/licenses/bsd-license.php
28 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
29 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
31 @par Revision Reference:
32 This Protocol is defined in Framework of EFI SMM Core Interface Spec
40 #include <FrameworkSmm.h>
42 #define EFI_SMM_BASE_PROTOCOL_GUID \
44 0x1390954D, 0xda95, 0x4227, {0x93, 0x28, 0x72, 0x82, 0xc2, 0x17, 0xda, 0xa8 } \
47 typedef struct _EFI_SMM_BASE_PROTOCOL EFI_SMM_BASE_PROTOCOL
;
50 // SMM Handler Definition
52 #define EFI_HANDLER_SUCCESS 0x0000
53 #define EFI_HANDLER_CRITICAL_EXIT 0x0001
54 #define EFI_HANDLER_SOURCE_QUIESCED 0x0002
55 #define EFI_HANDLER_SOURCE_PENDING 0x0003
58 Entry Point to Callback service
60 @param SmmImageHandle A handle allocated by the SMM infrastructure code
61 to uniquely designate a specific DXE SMM driver.
62 @param CommunicationBuffer A pointer to a collection of data in memory
63 that will be conveyed from a non-SMM environment into an SMM environment.
64 The buffer must be contiguous, physically mapped, and be a physical address.
65 @param SourceSize The size of the CommunicationBuffer.
72 (EFIAPI
*EFI_SMM_CALLBACK_ENTRY_POINT
)(
73 IN EFI_HANDLE SmmImageHandle
,
74 IN OUT VOID
*CommunicationBuffer OPTIONAL
,
75 IN OUT UINTN
*SourceSize OPTIONAL
79 // SMM Base Protocol Definition
82 Register a given driver into SMRAM.This is the equivalent of performing
83 the LoadImage/StartImage into System Management Mode.
85 @param This Protocol instance pointer.
86 @param FilePath Location of the image to be installed as the handler.
87 @param SourceBuffer Optional source buffer in case of the image file
89 @param SourceSize Size of the source image file, if in memory.
90 @param ImageHandle Pointer to the handle that reflects the driver
92 @param LegacyIA32Binary The binary image to load is legacy 16 bit code.
94 @retval EFI_SUCCESS The operation was successful.
95 @retval EFI_OUT_OF_RESOURCES There were no additional SMRAM resources to load the handler
96 @retval EFI_UNSUPPORTED This platform does not support 16-bit handlers.
97 @retval EFI_UNSUPPORTED In runtime.
98 @retval EFI_INVALID_PARAMETER The handlers was not the correct image type
103 (EFIAPI
*EFI_SMM_REGISTER_HANDLER
)(
104 IN EFI_SMM_BASE_PROTOCOL
*This
,
105 IN EFI_DEVICE_PATH_PROTOCOL
*FilePath
,
106 IN VOID
*SourceBuffer OPTIONAL
,
108 OUT EFI_HANDLE
*ImageHandle
,
109 IN BOOLEAN LegacyIA32Binary OPTIONAL
113 Remove a given driver SMRAM. This is the equivalent of performing
114 the UnloadImage System Management Mode.
116 @param This Protocol instance pointer.
117 @param ImageHandle Pointer to the handle that reflects the driver
120 @retval EFI_SUCCESS The operation was successful
121 @retval EFI_INVALID_PARAMETER The handler did not exist
122 @retval EFI_UNSUPPORTED In runtime.
127 (EFIAPI
*EFI_SMM_UNREGISTER_HANDLER
)(
128 IN EFI_SMM_BASE_PROTOCOL
*This
,
129 IN EFI_HANDLE ImageHandle
133 The SMM Inter-module Communicate Service Communicate() function
134 provides a services to send/received messages from a registered
135 EFI service. The BASE protocol driver is responsible for doing
136 any of the copies such that the data lives in boot-service accessible RAM.
138 @param This Protocol instance pointer.
139 @param ImageHandle Pointer to the handle that reflects the driver
141 @param CommunicationBuffer Pointer to the buffer to convey into SMRAM.
142 @param SourceSize Size of the contents of buffer..
144 @retval EFI_SUCCESS The message was successfully posted
145 @retval EFI_INVALID_PARAMETER The buffer was NULL
150 (EFIAPI
*EFI_SMM_COMMUNICATE
)(
151 IN EFI_SMM_BASE_PROTOCOL
*This
,
152 IN EFI_HANDLE ImageHandle
,
153 IN OUT VOID
*CommunicationBuffer
,
154 IN OUT UINTN
*SourceSize
158 Register a callback to execute within SMM.
159 This allows receipt of messages created with the Boot Service COMMUNICATE.
161 @param This Protocol instance pointer.
162 @param CallbackAddress Address of the callback service
163 @param MakeFirst If present, will stipulate that the handler is posted
164 to be the first module executed in the dispatch table.
165 @param MakeLast If present, will stipulate that the handler is posted
166 to be last executed in the dispatch table.
167 @param FloatingPointSave This is an optional parameter which informs the
168 EFI_SMM_ACCESS_PROTOCOL Driver core if it needs to save
169 the floating point register state. If any of the handlers
170 require this, then the state will be saved for all of the handlers.
172 @retval EFI_SUCCESS The operation was successful
173 @retval EFI_OUT_OF_RESOURCES Not enough space in the dispatch queue
174 @retval EFI_UNSUPPORTED In runtime.
175 @retval EFI_UNSUPPORTED Not in SMM.
180 (EFIAPI
*EFI_SMM_CALLBACK_SERVICE
)(
181 IN EFI_SMM_BASE_PROTOCOL
*This
,
182 IN EFI_HANDLE SmmImageHandle
,
183 IN EFI_SMM_CALLBACK_ENTRY_POINT CallbackAddress
,
184 IN BOOLEAN MakeLast OPTIONAL
,
185 IN BOOLEAN FloatingPointSave OPTIONAL
189 The SmmAllocatePool() function allocates a memory region of Size bytes from memory of
190 type PoolType and returns the address of the allocated memory in the location referenced
191 by Buffer. This function allocates pages from EFI SMRAM Memory as needed to grow the
192 requested pool type. All allocations are eight-byte aligned.
194 @param This Protocol instance pointer.
195 @param PoolType The type of pool to allocate.
196 The only supported type is EfiRuntimeServicesData;
197 the interface will internally map this runtime request to SMRAM.
198 @param Size The number of bytes to allocate from the pool.
199 @param Buffer A pointer to a pointer to the allocated buffer if the call
200 succeeds; undefined otherwise.
202 @retval EFI_SUCCESS The requested number of bytes was allocated.
203 @retval EFI_OUT_OF_RESOURCES The pool requested could not be allocated.
204 @retval EFI_INVALID_PARAMETER PoolType was invalid.
205 @retval EFI_UNSUPPORTED In runtime.
210 (EFIAPI
*EFI_SMM_ALLOCATE_POOL
)(
211 IN EFI_SMM_BASE_PROTOCOL
*This
,
212 IN EFI_MEMORY_TYPE PoolType
,
218 The SmmFreePool() function returns the memory specified by Buffer to the system.
219 On return, the memory's type is EFI SMRAM Memory. The Buffer that is freed must
220 have been allocated by SmmAllocatePool().
222 @param This Protocol instance pointer.
223 @param Buffer Pointer to the buffer allocation.
225 @retval EFI_SUCCESS The memory was returned to the system.
226 @retval EFI_INVALID_PARAMETER Buffer was invalid.
227 @retval EFI_UNSUPPORTED In runtime.
232 (EFIAPI
*EFI_SMM_FREE_POOL
)(
233 IN EFI_SMM_BASE_PROTOCOL
*This
,
238 This routine tells caller if execution context is SMM or not.
240 @param This Protocol instance pointer.
241 @param InSmm Whether the caller is inside SMM for IA-32 or servicing a PMI for the Itanium processor family.
243 @retval EFI_SUCCESS The operation was successful
248 (EFIAPI
*EFI_SMM_INSIDE_OUT
)(
249 IN EFI_SMM_BASE_PROTOCOL
*This
,
254 The GetSmstLocation() function returns the locatin of the System Management
255 Service Table. The use of the API is such that a driver can discover the
256 location of the SMST in its entry point and then cache it in some driver
257 global variable so that the SMST can be invoked in subsequent callbacks.
259 @param This Protocol instance pointer.
260 @param Smst Pointer to the SMST.
262 @retval EFI_SUCCESS The operation was successful
263 @retval EFI_INVALID_PARAMETER Smst was invalid.
264 @retval EFI_UNSUPPORTED Not in SMM.
269 (EFIAPI
*EFI_SMM_GET_SMST_LOCATION
)(
270 IN EFI_SMM_BASE_PROTOCOL
*This
,
271 IN OUT EFI_SMM_SYSTEM_TABLE
**Smst
275 @par Protocol Description:
276 This protocol is used to install SMM handlers for support of subsequent SMI/PMI
277 activations. This protocol is available on both IA-32 and Itanium-based systems.
280 Registers a handler to run in System Management RAM (SMRAM).
283 Removes a handler from execution in SMRAM.
286 Sends/receives a message for a registered handler.
288 @param RegisterCallback
289 Registers a callback from the constructor.
292 Detects whether the caller is inside or outside of SMM. SName
294 @param SmmAllocatePool
300 @param GetSmstLocation
301 Retrieves the location of the System Management System Table (SMST).
304 struct _EFI_SMM_BASE_PROTOCOL
{
305 EFI_SMM_REGISTER_HANDLER Register
;
306 EFI_SMM_UNREGISTER_HANDLER UnRegister
;
307 EFI_SMM_COMMUNICATE Communicate
;
308 EFI_SMM_CALLBACK_SERVICE RegisterCallback
;
309 EFI_SMM_INSIDE_OUT InSmm
;
310 EFI_SMM_ALLOCATE_POOL SmmAllocatePool
;
311 EFI_SMM_FREE_POOL SmmFreePool
;
312 EFI_SMM_GET_SMST_LOCATION GetSmstLocation
;
315 extern EFI_GUID gEfiSmmBaseProtocolGuid
;