IntelFrameworkPkg/Include/Protocol/SmmBase.h

   1 /** @file
   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.
   5
   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:
   9   - InSmm()
  10   - Communicate()
  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.
  21
  22   @par Revision Reference:
  23   This Protocol is defined in Framework of EFI SMM Core Interface Spec
  24   Version 0.9.
  25
  26 Copyright (c) 2007 - 2009, Intel Corporation
  27 All rights reserved. This program and the accompanying materials
  28 are licensed and made available under the terms and conditions of the BSD License
  29 which accompanies this distribution.  The full text of the license may be found at
  30 http://opensource.org/licenses/bsd-license.php
  31
  32 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  33 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  34
  35 **/
  36
  37 #ifndef _SMM_BASE_H_
  38 #define _SMM_BASE_H_
  39
  40 #define EFI_SMM_BASE_PROTOCOL_GUID \
  41   { \
  42     0x1390954D, 0xda95, 0x4227, {0x93, 0x28, 0x72, 0x82, 0xc2, 0x17, 0xda, 0xa8 } \
  43   }
  44
  45 typedef struct _EFI_SMM_BASE_PROTOCOL             EFI_SMM_BASE_PROTOCOL;
  46
  47 //
  48 // SMM Handler Definition
  49 //
  50 #define EFI_HANDLER_SUCCESS         0x0000
  51 #define EFI_HANDLER_CRITICAL_EXIT   0x0001
  52 #define EFI_HANDLER_SOURCE_QUIESCED 0x0002
  53 #define EFI_HANDLER_SOURCE_PENDING  0x0003
  54
  55 /**
  56   Entry Point to Callback service
  57
  58   @param[in]  SmmImageHandle        A handle allocated by the SMM infrastructure code
  59                                     to uniquely designate a specific DXE SMM driver.
  60   @param[in]  CommunicationBuffer   A pointer to a collection of data in memory
  61                                     that will be conveyed from a non-SMM environment into an SMM environment.
  62                                     The buffer must be contiguous, physically mapped, and be a physical address.
  63   @param[in]  SourceSize            The size of the CommunicationBuffer.
  64
  65   @return     Status code
  66
  67 **/
  68 typedef
  69 EFI_STATUS
  70 (EFIAPI *EFI_SMM_CALLBACK_ENTRY_POINT)(
  71   IN EFI_HANDLE             SmmImageHandle,
  72   IN OUT VOID               *CommunicationBuffer OPTIONAL,
  73   IN OUT UINTN              *SourceSize OPTIONAL
  74   );
  75
  76 //
  77 // SMM Base Protocol Definition
  78 //
  79 /**
  80   Register a given driver into SMRAM.This is the equivalent of performing
  81   the LoadImage/StartImage into System Management Mode.
  82
  83   @param[in]   This                  Protocol instance pointer.
  84   @param[in]   FilePath              Location of the image to be installed as the handler.
  85   @param[in]   SourceBuffer          Optional source buffer in case of the image file
  86                                      being in memory.
  87   @param[in]   SourceSize            Size of the source image file, if in memory.
  88   @param[out]  ImageHandle           The handle that the base driver uses to decode
  89                                      the handler. Unique among SMM handlers only,
  90                                      not unique across DXE/EFI.
  91   @param[in]   LegacyIA32Binary      An optional parameter that details that the associated
  92                                      file is a real-mode IA-32 binary.
  93
  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
  99
 100 **/
 101 typedef
 102 EFI_STATUS
 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,
 107   IN  UINTN                                          SourceSize,
 108   OUT EFI_HANDLE                                     *ImageHandle,
 109   IN  BOOLEAN                                        LegacyIA32Binary OPTIONAL
 110   );
 111
 112 /**
 113   Removes a handler from execution within SMRAM.  This is the equivalent of performing
 114   the UnloadImage in System Management Mode.
 115
 116   @param[in]  This                  Protocol instance pointer.
 117   @param[in]  ImageHandle           The handler to be removed.
 118
 119   @retval     EFI_SUCCESS           The operation was successful
 120   @retval     EFI_INVALID_PARAMETER The handler did not exist
 121   @retval     EFI_UNSUPPORTED       In runtime.
 122
 123 **/
 124 typedef
 125 EFI_STATUS
 126 (EFIAPI *EFI_SMM_UNREGISTER_HANDLER)(
 127   IN EFI_SMM_BASE_PROTOCOL          *This,
 128   IN EFI_HANDLE                     ImageHandle
 129   );
 130
 131 /**
 132   The SMM Inter-module Communicate Service Communicate() function
 133   provides a services to send/received messages from a registered
 134   EFI service.  The BASE protocol driver is responsible for doing
 135   any of the copies such that the data lives in boot-service-accessible RAM.
 136
 137   @param[in]      This                  Protocol instance pointer.
 138   @param[in]      ImageHandle           The handle of the registered driver.
 139   @param[in,out]  CommunicationBuffer   Pointer to the buffer to convey into SMRAM.
 140   @param[in,out]  SourceSize            The size of the data buffer being passed in.
 141                                         On exit, the size of data being returned.
 142                                         Zero if the handler does not wish to reply with any data.
 143
 144   @retval         EFI_SUCCESS           The message was successfully posted
 145   @retval         EFI_INVALID_PARAMETER The buffer was NULL
 146
 147 **/
 148 typedef
 149 EFI_STATUS
 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
 155   );
 156
 157 /**
 158   Register a callback to execute within SMM.
 159   This allows receipt of messages created with EFI_SMM_BASE_PROTOCOL.Communicate().
 160
 161   @param[in]  This                  Protocol instance pointer.
 162   @param[in]  SmmImageHandle        Handle of the callback service.
 163   @param[in]  CallbackAddress       Address of the callback service.
 164   @param[in]  MakeLast              If present, will stipulate that the handler is posted to
 165                                     be executed last in the dispatch table.
 166   @param[in]  FloatingPointSave     This is an optional parameter which informs the
 167                                     EFI_SMM_ACCESS_PROTOCOL Driver core if it needs to save
 168                                     the floating point register state. If any of the handlers
 169                                     require this, then the state will be saved for all of the handlers.
 170
 171   @retval     EFI_SUCCESS           The operation was successful
 172   @retval     EFI_OUT_OF_RESOURCES  Not enough space in the dispatch queue
 173   @retval     EFI_UNSUPPORTED       In runtime.
 174   @retval     EFI_UNSUPPORTED       The caller is not in SMM.
 175
 176 **/
 177 typedef
 178 EFI_STATUS
 179 (EFIAPI *EFI_SMM_CALLBACK_SERVICE)(
 180   IN EFI_SMM_BASE_PROTOCOL                            *This,
 181   IN EFI_HANDLE                                       SmmImageHandle,
 182   IN EFI_SMM_CALLBACK_ENTRY_POINT                     CallbackAddress,
 183   IN BOOLEAN                                          MakeLast OPTIONAL,
 184   IN BOOLEAN                                          FloatingPointSave OPTIONAL
 185   );
 186
 187 /**
 188   The SmmAllocatePool() function allocates a memory region of Size bytes from memory of
 189   type PoolType and returns the address of the allocated memory in the location referenced
 190   by Buffer.  This function allocates pages from EFI SMRAM Memory as needed to grow the
 191   requested pool type.  All allocations are eight-byte aligned.
 192
 193   @param[in]   This                  Protocol instance pointer.
 194   @param[in]   PoolType              The type of pool to allocate.
 195                                      The only supported type is EfiRuntimeServicesData;
 196                                      the interface will internally map this runtime request to
 197                                      SMRAM for IA-32 and leave as this type for the Itanium
 198                                      processor family. Other types can be ignored.
 199   @param[in]   Size                  The number of bytes to allocate from the pool.
 200   @param[out]  Buffer                A pointer to a pointer to the allocated buffer if the call
 201                                      succeeds; undefined otherwise.
 202
 203   @retval      EFI_SUCCESS           The requested number of bytes was allocated.
 204   @retval      EFI_OUT_OF_RESOURCES  The pool requested could not be allocated.
 205   @retval      EFI_UNSUPPORTED       In runtime.
 206
 207 **/
 208 typedef
 209 EFI_STATUS
 210 (EFIAPI *EFI_SMM_ALLOCATE_POOL)(
 211   IN EFI_SMM_BASE_PROTOCOL          *This,
 212   IN EFI_MEMORY_TYPE                PoolType,
 213   IN UINTN                          Size,
 214   OUT VOID                          **Buffer
 215   );
 216
 217 /**
 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().
 221
 222   @param[in]  This                  Protocol instance pointer.
 223   @param[in]  Buffer                Pointer to the buffer allocation.
 224
 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.
 228
 229 **/
 230 typedef
 231 EFI_STATUS
 232 (EFIAPI *EFI_SMM_FREE_POOL)(
 233   IN EFI_SMM_BASE_PROTOCOL          *This,
 234   IN VOID                           *Buffer
 235   );
 236
 237 /**
 238   This routine tells caller if execution context is SMM or not.
 239
 240   @param[in]   This                   Protocol instance pointer.
 241   @param[out]  InSmm                  Whether the caller is inside SMM for IA-32
 242                                       or servicing a PMI for the Itanium processor
 243                                       family.
 244
 245   @retval      EFI_SUCCESS            The operation was successful
 246   @retval      EFI_INVALID_PARAMETER  InSmm was NULL.
 247
 248 **/
 249 typedef
 250 EFI_STATUS
 251 (EFIAPI *EFI_SMM_INSIDE_OUT)(
 252   IN EFI_SMM_BASE_PROTOCOL          *This,
 253   OUT BOOLEAN                       *InSmm
 254   );
 255
 256 /**
 257   The GetSmstLocation() function returns the locatin of the System Management
 258   Service Table.  The use of the API is such that a driver can discover the
 259   location of the SMST in its entry point and then cache it in some driver
 260   global variable so that the SMST can be invoked in subsequent callbacks.
 261
 262   @param[in]  This                  Protocol instance pointer.
 263   @param[in]  Smst                  Pointer to the SMST.
 264
 265   @retval     EFI_SUCCESS           The operation was successful
 266   @retval     EFI_INVALID_PARAMETER Smst was invalid.
 267   @retval     EFI_UNSUPPORTED       Not in SMM.
 268
 269 **/
 270 typedef
 271 EFI_STATUS
 272 (EFIAPI *EFI_SMM_GET_SMST_LOCATION)(
 273   IN EFI_SMM_BASE_PROTOCOL          *This,
 274   IN OUT EFI_SMM_SYSTEM_TABLE       **Smst
 275   );
 276
 277 ///
 278 /// This protocol is used to install SMM handlers for support of subsequent SMI/PMI
 279 /// activations. This protocol is available on both IA-32 and Itanium-based systems.
 280 ///
 281 struct _EFI_SMM_BASE_PROTOCOL {
 282   EFI_SMM_REGISTER_HANDLER    Register;
 283   EFI_SMM_UNREGISTER_HANDLER  UnRegister;
 284   EFI_SMM_COMMUNICATE         Communicate;
 285   EFI_SMM_CALLBACK_SERVICE    RegisterCallback;
 286   EFI_SMM_INSIDE_OUT          InSmm;
 287   EFI_SMM_ALLOCATE_POOL       SmmAllocatePool;
 288   EFI_SMM_FREE_POOL           SmmFreePool;
 289   EFI_SMM_GET_SMST_LOCATION   GetSmstLocation;
 290 };
 291
 292 extern EFI_GUID gEfiSmmBaseProtocolGuid;
 293
 294 #endif