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129 lines
5.2 KiB
C
129 lines
5.2 KiB
C
/** @file
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SMM Software Dispatch Protocol introduced from PI 1.2 Specification
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Volume 4 System Management Mode Core Interface.
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This protocol provides the parent dispatch service for a given SMI source generator.
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Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _SMM_SW_DISPATCH2_H_
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#define _SMM_SW_DISPATCH2_H_
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#include <Protocol/MmSwDispatch.h>
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#include <Pi/PiSmmCis.h>
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#define EFI_SMM_SW_DISPATCH2_PROTOCOL_GUID EFI_MM_SW_DISPATCH_PROTOCOL_GUID
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///
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/// A particular chipset may not support all possible software SMI input values.
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/// For example, the ICH supports only values 00h to 0FFh. The parent only allows a single
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/// child registration for each SwSmiInputValue.
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///
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typedef struct {
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UINTN SwSmiInputValue;
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} EFI_SMM_SW_REGISTER_CONTEXT;
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///
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/// The DispatchFunction will be called with Context set to the same value as was passed into
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/// this function in RegisterContext and with CommBuffer (and CommBufferSize) pointing
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/// to an instance of EFI_SMM_SW_CONTEXT indicating the index of the CPU which generated the
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/// software SMI.
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///
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typedef struct {
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///
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/// The 0-based index of the CPU which generated the software SMI.
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///
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UINTN SwSmiCpuIndex;
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///
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/// This value corresponds directly to the CommandPort parameter used in the call to Trigger().
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///
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UINT8 CommandPort;
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///
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/// This value corresponds directly to the DataPort parameter used in the call to Trigger().
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///
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UINT8 DataPort;
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} EFI_SMM_SW_CONTEXT;
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typedef struct _EFI_SMM_SW_DISPATCH2_PROTOCOL EFI_SMM_SW_DISPATCH2_PROTOCOL;
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/**
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Register a child SMI source dispatch function for the specified software SMI.
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This service registers a function (DispatchFunction) which will be called when the software
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SMI source specified by RegisterContext->SwSmiCpuIndex is detected. On return,
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DispatchHandle contains a unique handle which may be used later to unregister the function
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using UnRegister().
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@param[in] This Pointer to the EFI_SMM_SW_DISPATCH2_PROTOCOL instance.
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@param[in] DispatchFunction Function to register for handler when the specified software
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SMI is generated.
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@param[in, out] RegisterContext Pointer to the dispatch function's context.
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The caller fills this context in before calling
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the register function to indicate to the register
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function which Software SMI input value the
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dispatch function should be invoked for.
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@param[out] DispatchHandle Handle generated by the dispatcher to track the
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function instance.
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@retval EFI_SUCCESS The dispatch function has been successfully
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registered and the SMI source has been enabled.
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@retval EFI_DEVICE_ERROR The SW driver was unable to enable the SMI source.
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@retval EFI_INVALID_PARAMETER RegisterContext is invalid. The SW SMI input value
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is not within a valid range or is already in use.
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@retval EFI_OUT_OF_RESOURCES There is not enough memory (system or SMM) to manage this
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child.
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@retval EFI_OUT_OF_RESOURCES A unique software SMI value could not be assigned
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for this dispatch.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_SW_REGISTER2)(
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IN CONST EFI_SMM_SW_DISPATCH2_PROTOCOL *This,
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IN EFI_SMM_HANDLER_ENTRY_POINT2 DispatchFunction,
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IN OUT EFI_SMM_SW_REGISTER_CONTEXT *RegisterContext,
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OUT EFI_HANDLE *DispatchHandle
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);
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/**
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Unregister a child SMI source dispatch function for the specified software SMI.
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This service removes the handler associated with DispatchHandle so that it will no longer be
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called in response to a software SMI.
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@param[in] This Pointer to the EFI_SMM_SW_DISPATCH2_PROTOCOL instance.
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@param[in] DispatchHandle Handle of dispatch function to deregister.
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@retval EFI_SUCCESS The dispatch function has been successfully unregistered.
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@retval EFI_INVALID_PARAMETER The DispatchHandle was not valid.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_SW_UNREGISTER2)(
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IN CONST EFI_SMM_SW_DISPATCH2_PROTOCOL *This,
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IN EFI_HANDLE DispatchHandle
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);
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///
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/// Interface structure for the SMM Software SMI Dispatch Protocol.
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///
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/// The EFI_SMM_SW_DISPATCH2_PROTOCOL provides the ability to install child handlers for the
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/// given software. These handlers will respond to software interrupts, and the maximum software
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/// interrupt in the EFI_SMM_SW_REGISTER_CONTEXT is denoted by MaximumSwiValue.
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///
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struct _EFI_SMM_SW_DISPATCH2_PROTOCOL {
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EFI_SMM_SW_REGISTER2 Register;
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EFI_SMM_SW_UNREGISTER2 UnRegister;
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///
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/// A read-only field that describes the maximum value that can be used in the
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/// EFI_SMM_SW_DISPATCH2_PROTOCOL.Register() service.
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///
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UINTN MaximumSwiValue;
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};
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extern EFI_GUID gEfiSmmSwDispatch2ProtocolGuid;
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#endif
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