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321 lines
13 KiB
C
321 lines
13 KiB
C
/** @file
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This file declares SMM Base abstraction protocol.
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This protocol is used to install SMM handlers for support of subsequent SMI/PMI activations. This
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protocol is available on both IA-32 and Itanium-based systems.
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The EFI_SMM_BASE_PROTOCOL is a set of services that is exported by a processor device. It is
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a required protocol for the platform processor. This protocol can be used in both boot services and
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runtime mode. However, only the following member functions need to exist during runtime:
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- InSmm()
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- Communicate()
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This protocol is responsible for registering the handler services. The order in which the handlers are
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executed is prescribed only with respect to the MakeLast flag in the RegisterCallback()
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service. The driver exports these registration and unregistration services in boot services mode, but
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the registered handlers will execute through the preboot and runtime. The only way to change the
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behavior of a registered driver after ExitBootServices() has been invoked is to use some
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private communication mechanism with the driver to order it to quiesce. This model permits typical
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use cases, such as invoking the handler to enter ACPI mode, where the OS loader would make this
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call before boot services are terminated. On the other hand, handlers for services such as chipset
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workarounds for the century rollover in CMOS should provide commensurate services throughout
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preboot and OS runtime.
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Copyright (c) 2007 - 2009, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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@par Revision Reference:
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This Protocol is defined in Framework of EFI SMM Core Interface Spec
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Version 0.9.
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**/
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#ifndef _SMM_BASE_H_
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#define _SMM_BASE_H_
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///
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/// Global ID for the EFI_SMM_BASE_PROTOCOL
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///
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#define EFI_SMM_BASE_PROTOCOL_GUID \
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{ \
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0x1390954D, 0xda95, 0x4227, {0x93, 0x28, 0x72, 0x82, 0xc2, 0x17, 0xda, 0xa8 } \
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}
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///
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/// Forward declaration for EFI_SMM_BASE_PROTOCOL
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///
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typedef struct _EFI_SMM_BASE_PROTOCOL EFI_SMM_BASE_PROTOCOL;
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///
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/// EFI SMM Handler return codes
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///
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///@{
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#define EFI_HANDLER_SUCCESS 0x0000
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#define EFI_HANDLER_CRITICAL_EXIT 0x0001
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#define EFI_HANDLER_SOURCE_QUIESCED 0x0002
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#define EFI_HANDLER_SOURCE_PENDING 0x0003
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///@}
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///
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/// The header data is mandatory for messages sent into the SMM agent.
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///
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typedef struct {
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///
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/// Allows for disambiguation of the message format.
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///
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EFI_GUID HeaderGuid;
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///
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/// Describes the size of the message, not including the header.
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///
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UINTN MessageLength;
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///
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/// Designates an array of bytes that is MessageLength in size.
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///
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UINT8 Data[1];
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} EFI_SMM_COMMUNICATE_HEADER;
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/**
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Entry Point to Callback service
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@param[in] SmmImageHandle A handle allocated by the SMM infrastructure code
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to uniquely designate a specific DXE SMM driver.
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@param[in] CommunicationBuffer A pointer to a collection of data in memory
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that will be conveyed from a non-SMM environment into an SMM environment.
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The buffer must be contiguous and physically mapped, and must be a physical address.
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@param[in] SourceSize The size of the CommunicationBuffer.
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@return Status code
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_CALLBACK_ENTRY_POINT)(
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IN EFI_HANDLE SmmImageHandle,
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IN OUT VOID *CommunicationBuffer OPTIONAL,
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IN OUT UINTN *SourceSize OPTIONAL
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);
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//
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// SMM Base Protocol Definition
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//
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/**
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Register a given driver into SMRAM. This is the equivalent of performing
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the LoadImage/StartImage into System Management Mode.
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@param[in] This Protocol instance pointer.
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@param[in] FilePath Location of the image to be installed as the handler.
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@param[in] SourceBuffer Optional source buffer in case the image file
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is in memory.
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@param[in] SourceSize Size of the source image file, if in memory.
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@param[out] ImageHandle The handle that the base driver uses to decode
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the handler. Unique among SMM handlers only,
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not unique across DXE/EFI.
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@param[in] LegacyIA32Binary An optional parameter specifying that the associated
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file is a real-mode IA-32 binary.
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@retval EFI_SUCCESS The operation was successful.
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@retval EFI_OUT_OF_RESOURCES There were no additional SMRAM resources to load the handler
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@retval EFI_UNSUPPORTED This platform does not support 16-bit handlers.
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@retval EFI_UNSUPPORTED Platform is in runtime.
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@retval EFI_INVALID_PARAMETER The handlers was not the correct image type
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_REGISTER_HANDLER)(
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IN EFI_SMM_BASE_PROTOCOL *This,
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IN EFI_DEVICE_PATH_PROTOCOL *FilePath,
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IN VOID *SourceBuffer OPTIONAL,
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IN UINTN SourceSize,
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OUT EFI_HANDLE *ImageHandle,
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IN BOOLEAN LegacyIA32Binary OPTIONAL
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);
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/**
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Removes a handler from execution within SMRAM. This is the equivalent of performing
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the UnloadImage in System Management Mode.
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@param[in] This Protocol instance pointer.
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@param[in] ImageHandle The handler to be removed.
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@retval EFI_SUCCESS The operation was successful
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@retval EFI_INVALID_PARAMETER The handler did not exist
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@retval EFI_UNSUPPORTED Platform is in runtime.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_UNREGISTER_HANDLER)(
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IN EFI_SMM_BASE_PROTOCOL *This,
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IN EFI_HANDLE ImageHandle
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);
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/**
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The SMM Inter-module Communicate Service Communicate() function
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provides a service to send/receive messages from a registered
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EFI service. The BASE protocol driver is responsible for doing
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any of the copies such that the data lives in boot-service-accessible RAM.
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@param[in] This Protocol instance pointer.
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@param[in] ImageHandle The handle of the registered driver.
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@param[in,out] CommunicationBuffer Pointer to the buffer to convey into SMRAM.
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@param[in,out] SourceSize The size of the data buffer being passed in.
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On exit, the size of data being returned.
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Zero if the handler does not wish to reply with any data.
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@retval EFI_SUCCESS The message was successfully posted
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@retval EFI_INVALID_PARAMETER The buffer was NULL
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_COMMUNICATE)(
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IN EFI_SMM_BASE_PROTOCOL *This,
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IN EFI_HANDLE ImageHandle,
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IN OUT VOID *CommunicationBuffer,
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IN OUT UINTN *SourceSize
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);
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/**
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Register a callback to execute within SMM.
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This allows receipt of messages created with EFI_SMM_BASE_PROTOCOL.Communicate().
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@param[in] This Protocol instance pointer.
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@param[in] SmmImageHandle Handle of the callback service.
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@param[in] CallbackAddress Address of the callback service.
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@param[in] MakeLast If present, will stipulate that the handler is posted to
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be executed last in the dispatch table.
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@param[in] FloatingPointSave An optional parameter that informs the
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EFI_SMM_ACCESS_PROTOCOL Driver core if it needs to save
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the floating point register state. If any handler
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require this, the state will be saved for all handlers.
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@retval EFI_SUCCESS The operation was successful
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@retval EFI_OUT_OF_RESOURCES Not enough space in the dispatch queue
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@retval EFI_UNSUPPORTED Platform is in runtime.
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@retval EFI_UNSUPPORTED The caller is not in SMM.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_CALLBACK_SERVICE)(
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IN EFI_SMM_BASE_PROTOCOL *This,
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IN EFI_HANDLE SmmImageHandle,
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IN EFI_SMM_CALLBACK_ENTRY_POINT CallbackAddress,
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IN BOOLEAN MakeLast OPTIONAL,
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IN BOOLEAN FloatingPointSave OPTIONAL
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);
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/**
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The SmmAllocatePool() function allocates a memory region of Size bytes from memory of
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type PoolType and returns the address of the allocated memory in the location referenced
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by Buffer. This function allocates pages from EFI SMRAM Memory as needed to grow the
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requested pool type. All allocations are eight-byte aligned.
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@param[in] This Protocol instance pointer.
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@param[in] PoolType The type of pool to allocate.
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The only supported type is EfiRuntimeServicesData;
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the interface will internally map this runtime request to
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SMRAM for IA-32 and leave as this type for the Itanium
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processor family. Other types can be ignored.
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@param[in] Size The number of bytes to allocate from the pool.
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@param[out] Buffer A pointer to a pointer to the allocated buffer if the call
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succeeds; undefined otherwise.
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@retval EFI_SUCCESS The requested number of bytes was allocated.
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@retval EFI_OUT_OF_RESOURCES The pool requested could not be allocated.
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@retval EFI_UNSUPPORTED Platform is in runtime.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_ALLOCATE_POOL)(
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IN EFI_SMM_BASE_PROTOCOL *This,
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IN EFI_MEMORY_TYPE PoolType,
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IN UINTN Size,
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OUT VOID **Buffer
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);
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/**
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The SmmFreePool() function returns the memory specified by Buffer to the system.
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On return, the memory's type is EFI SMRAM Memory. The Buffer that is freed must
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have been allocated by SmmAllocatePool().
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@param[in] This Protocol instance pointer.
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@param[in] Buffer Pointer to the buffer allocation.
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@retval EFI_SUCCESS The memory was returned to the system.
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@retval EFI_INVALID_PARAMETER Buffer was invalid.
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@retval EFI_UNSUPPORTED Platform is in runtime.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_FREE_POOL)(
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IN EFI_SMM_BASE_PROTOCOL *This,
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IN VOID *Buffer
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);
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/**
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This routine tells caller if execution context is SMM or not.
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@param[in] This Protocol instance pointer.
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@param[out] InSmm Whether the caller is inside SMM for IA-32
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or servicing a PMI for the Itanium processor
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family.
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@retval EFI_SUCCESS The operation was successful
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@retval EFI_INVALID_PARAMETER InSmm was NULL.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_INSIDE_OUT)(
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IN EFI_SMM_BASE_PROTOCOL *This,
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OUT BOOLEAN *InSmm
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);
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/**
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The GetSmstLocation() function returns the location of the System Management
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Service Table. The use of the API is such that a driver can discover the
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location of the SMST in its entry point and then cache it in some driver
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global variable so that the SMST can be invoked in subsequent callbacks.
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@param[in] This Protocol instance pointer.
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@param[in] Smst Pointer to the SMST.
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@retval EFI_SUCCESS The operation was successful
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@retval EFI_INVALID_PARAMETER Smst was invalid.
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@retval EFI_UNSUPPORTED Not in SMM.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_GET_SMST_LOCATION)(
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IN EFI_SMM_BASE_PROTOCOL *This,
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IN OUT EFI_SMM_SYSTEM_TABLE **Smst
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);
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///
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/// This protocol is used to install SMM handlers for support of subsequent SMI/PMI
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/// activations. This protocol is available on both IA-32 and Itanium-based systems.
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///
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struct _EFI_SMM_BASE_PROTOCOL {
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EFI_SMM_REGISTER_HANDLER Register;
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EFI_SMM_UNREGISTER_HANDLER UnRegister;
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EFI_SMM_COMMUNICATE Communicate;
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EFI_SMM_CALLBACK_SERVICE RegisterCallback;
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EFI_SMM_INSIDE_OUT InSmm;
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EFI_SMM_ALLOCATE_POOL SmmAllocatePool;
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EFI_SMM_FREE_POOL SmmFreePool;
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EFI_SMM_GET_SMST_LOCATION GetSmstLocation;
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};
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extern EFI_GUID gEfiSmmBaseProtocolGuid;
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#endif
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