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120 lines
4.7 KiB
C
120 lines
4.7 KiB
C
/** @file
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MM General Purpose Input (GPI) Dispatch Protocol as defined in PI 1.5 Specification
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Volume 4 Management Mode Core Interface.
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This protocol provides the parent dispatch service for the General Purpose Input
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(GPI) MMI source generator.
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The EFI_MM_GPI_DISPATCH_PROTOCOL provides the ability to install child handlers for the
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given event types. Several inputs can be enabled. This purpose of this interface is to generate an
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MMI in response to any of these inputs having a true value provided.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This protocol is from PI Version 1.5.
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**/
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#ifndef _MM_GPI_DISPATCH_H_
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#define _MM_GPI_DISPATCH_H_
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#include <Pi/PiMmCis.h>
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#define EFI_MM_GPI_DISPATCH_PROTOCOL_GUID \
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{ \
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0x25566b03, 0xb577, 0x4cbf, {0x95, 0x8c, 0xed, 0x66, 0x3e, 0xa2, 0x43, 0x80 } \
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}
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///
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/// The dispatch function's context.
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///
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typedef struct {
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///
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/// A number from one of 2^64 possible GPIs that can generate an MMI. A
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/// 0 corresponds to logical GPI[0]; 1 corresponds to logical GPI[1]; and
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/// GpiNum of N corresponds to GPI[N], where N can span from 0 to 2^64-1.
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///
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UINT64 GpiNum;
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} EFI_MM_GPI_REGISTER_CONTEXT;
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typedef struct _EFI_MM_GPI_DISPATCH_PROTOCOL EFI_MM_GPI_DISPATCH_PROTOCOL;
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/**
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Registers a child MMI source dispatch function with a parent MM driver.
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This service registers a function (DispatchFunction) which will be called when an MMI is
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generated because of one or more of the GPIs specified by RegisterContext. 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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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 pointing to another instance of
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EFI_MM_GPI_REGISTER_CONTEXT describing the GPIs which actually caused the MMI and
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CommBufferSize pointing to the size of the structure.
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@param[in] This Pointer to the EFI_MM_GPI_DISPATCH_PROTOCOL instance.
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@param[in] DispatchFunction Function to register for handler when the specified GPI causes an MMI.
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@param[in] 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 the GPI(s) for which the dispatch function
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should be invoked.
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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 MMI source has been enabled.
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@retval EFI_DEVICE_ERROR The driver was unable to enable the MMI source.
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@retval EFI_INVALID_PARAMETER RegisterContext is invalid. The GPI input value
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is not within valid range.
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@retval EFI_OUT_OF_RESOURCES There is not enough memory (system or MM) to manage this child.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_MM_GPI_REGISTER)(
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IN CONST EFI_MM_GPI_DISPATCH_PROTOCOL *This,
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IN EFI_MM_HANDLER_ENTRY_POINT DispatchFunction,
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IN CONST EFI_MM_GPI_REGISTER_CONTEXT *RegisterContext,
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OUT EFI_HANDLE *DispatchHandle
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);
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/**
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Unregisters a General Purpose Input (GPI) service.
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This service removes the handler associated with DispatchHandle so that it will no longer be
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called when the GPI triggers an MMI.
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@param[in] This Pointer to the EFI_MM_GPI_DISPATCH_PROTOCOL instance.
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@param[in] DispatchHandle Handle of the service to remove.
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@retval EFI_SUCCESS Handle of the service to remove.
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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_MM_GPI_UNREGISTER)(
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IN CONST EFI_MM_GPI_DISPATCH_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 MM GPI MMI Dispatch Protocol
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///
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/// The MM GPI MMI Dispatch Protocol provides the parent dispatch service
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/// for the General Purpose Input (GPI) MMI source generator.
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///
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struct _EFI_MM_GPI_DISPATCH_PROTOCOL {
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EFI_MM_GPI_REGISTER Register;
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EFI_MM_GPI_UNREGISTER UnRegister;
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///
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/// Denotes the maximum value of inputs that can have handlers attached.
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///
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UINTN NumSupportedGpis;
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};
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extern EFI_GUID gEfiMmGpiDispatchProtocolGuid;
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#endif
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