IntelFrameworkPkg/Include/Protocol/SmmGpiDispatch.h

   1 /** @file
   2   This file declares Smm Gpi Smi Child Protocol
   3   The EFI_SMM_GPI_DISPATCH_PROTOCOL provides the ability to install child handlers for the
   4   given event types. Several inputs can be enabled. This purpose of this interface is to generate an
   5   SMI in response to any of these inputs having a true value provided.
   6
   7   Copyright (c) 2007, Intel Corporation
   8   All rights reserved. This program and the accompanying materials
   9   are licensed and made available under the terms and conditions of the BSD License
  10   which accompanies this distribution.  The full text of the license may be found at
  11   http://opensource.org/licenses/bsd-license.php
  12
  13   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  14   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15
  16   Module Name:  SmmGpiDispatch.h
  17
  18   @par Revision Reference:
  19   This Protocol is defined in Framework of EFI SMM Core Interface Spec
  20   Version 0.9.
  21
  22 **/
  23
  24 #ifndef _EFI_SMM_GPI_DISPATCH_H_
  25 #define _EFI_SMM_GPI_DISPATCH_H_
  26
  27 #include <PiDxe.h>
  28
  29 //
  30 // Global ID for the GPI SMI Protocol
  31 //
  32 #define EFI_SMM_GPI_DISPATCH_PROTOCOL_GUID \
  33   { \
  34     0xe0744b81, 0x9513, 0x49cd, {0x8c, 0xea, 0xe9, 0x24, 0x5e, 0x70, 0x39, 0xda } \
  35   }
  36
  37 typedef struct _EFI_SMM_GPI_DISPATCH_PROTOCOL  EFI_SMM_GPI_DISPATCH_PROTOCOL;
  38
  39 //
  40 // Related Definitions
  41 //
  42 //
  43 // GpiMask is a bit mask of 32 possible general purpose inputs that can generate a
  44 // a SMI.  Bit 0 corresponds to logical GPI[0], 1 corresponds to logical GPI[1], etc.
  45 //
  46 // The logical GPI index to physical pin on device is described by the GPI device name
  47 // found on the same handle as the GpiSmi child dispatch protocol.  The GPI device name
  48 // is defined as protocol with a GUID name and NULL protocol pointer.
  49 //
  50 typedef struct {
  51   UINTN GpiNum;
  52 } EFI_SMM_GPI_DISPATCH_CONTEXT;
  53
  54 //
  55 // Member functions
  56 //
  57 /**
  58   Dispatch function for a GPI SMI handler.
  59
  60   @param  DispatchHandle        Handle of this dispatch function.
  61   @param  DispatchContext       Pointer to the dispatch function's context.
  62                                 The DispatchContext fields are filled in by the dispatching driver prior to
  63                                 invoking this dispatch function.
  64
  65   @return None
  66
  67 **/
  68 typedef
  69 VOID
  70 (EFIAPI *EFI_SMM_GPI_DISPATCH)(
  71   IN  EFI_HANDLE                    DispatchHandle,
  72   IN  EFI_SMM_GPI_DISPATCH_CONTEXT  *DispatchContext
  73   );
  74
  75 /**
  76   Register a child SMI source dispatch function with a parent SMM driver
  77
  78   @param  This                  Protocol instance pointer.
  79   @param  DispatchFunction      Pointer to dispatch function to be invoked for
  80                                 this SMI source
  81   @param  DispatchContext       Pointer to the dispatch function's context.
  82                                 The caller fills this context in before calling
  83                                 the register function to indicate to the register
  84                                 function the GPI(s) for which the dispatch function
  85                                 should be invoked.
  86   @param  DispatchHandle        Handle of dispatch function, for when interfacing
  87                                 with the parent Sx state SMM driver.
  88
  89   @retval EFI_SUCCESS           The dispatch function has been successfully
  90                                 registered and the SMI source has been enabled.
  91   @retval EFI_DEVICE_ERROR      The driver was unable to enable the SMI source.
  92   @retval EFI_OUT_OF_RESOURCES  Not enough memory (system or SMM) to manage this
  93                                 child.
  94   @retval EFI_INVALID_PARAMETER DispatchContext is invalid. The GPI input value
  95                                 is not within valid range.
  96
  97 **/
  98 typedef
  99 EFI_STATUS
 100 (EFIAPI *EFI_SMM_GPI_REGISTER)(
 101   IN EFI_SMM_GPI_DISPATCH_PROTOCOL            *This,
 102   IN  EFI_SMM_GPI_DISPATCH                    DispatchFunction,
 103   IN  EFI_SMM_GPI_DISPATCH_CONTEXT            *DispatchContext,
 104   OUT EFI_HANDLE                              *DispatchHandle
 105   );
 106
 107 /**
 108   Unregister a child SMI source dispatch function with a parent SMM driver
 109
 110   @param  This                  Protocol instance pointer.
 111   @param  DispatchHandle        Handle of dispatch function to deregister.
 112
 113   @retval EFI_SUCCESS           The dispatch function has been successfully
 114                                 unregistered and the SMI source has been disabled
 115                                 if there are no other registered child dispatch
 116                                 functions for this SMI source.
 117   @retval EFI_INVALID_PARAMETER Handle is invalid.
 118   @retval other                 TBD
 119
 120 **/
 121 typedef
 122 EFI_STATUS
 123 (EFIAPI *EFI_SMM_GPI_UNREGISTER)(
 124   IN EFI_SMM_GPI_DISPATCH_PROTOCOL            *This,
 125   IN  EFI_HANDLE                              DispatchHandle
 126   );
 127
 128 //
 129 // Interface structure for the SMM GPI SMI Dispatch Protocol
 130 //
 131 /**
 132   @par Protocol Description:
 133   Provides the parent dispatch service for the General Purpose Input
 134   (GPI) SMI source generator.
 135
 136   @param Register
 137   Installs a child service to be dispatched by this protocol.
 138
 139   @param UnRegister
 140   Removes a child service dispatched by this protocol.
 141
 142   @param NumSupportedGpis
 143   Denotes the maximum value of inputs that can have handlers attached.
 144
 145 **/
 146 struct _EFI_SMM_GPI_DISPATCH_PROTOCOL {
 147   EFI_SMM_GPI_REGISTER    Register;
 148   EFI_SMM_GPI_UNREGISTER  UnRegister;
 149   UINTN                   NumSupportedGpis;
 150 };
 151
 152 extern EFI_GUID gEfiSmmGpiDispatchProtocolGuid;
 153
 154 #endif