MdePkg/Include/Protocol/SmmSwDispatch2.h

   1 /** @file
   2   SMM Software Dispatch Protocol introduced from PI 1.2 Specification
   3   Volume 4 System Management Mode Core Interface.
   4
   5   This protocol provides the parent dispatch service for a given SMI source generator.
   6
   7   Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
   8   SPDX-License-Identifier: BSD-2-Clause-Patent
   9
  10 **/
  11
  12 #ifndef _SMM_SW_DISPATCH2_H_
  13 #define _SMM_SW_DISPATCH2_H_
  14
  15 #include <Protocol/MmSwDispatch.h>
  16 #include <Pi/PiSmmCis.h>
  17
  18 #define EFI_SMM_SW_DISPATCH2_PROTOCOL_GUID EFI_MM_SW_DISPATCH_PROTOCOL_GUID
  19
  20 ///
  21 /// A particular chipset may not support all possible software SMI input values.
  22 /// For example, the ICH supports only values 00h to 0FFh.  The parent only allows a single
  23 /// child registration for each SwSmiInputValue.
  24 ///
  25 typedef struct {
  26   UINTN SwSmiInputValue;
  27 } EFI_SMM_SW_REGISTER_CONTEXT;
  28
  29 ///
  30 /// The DispatchFunction will be called with Context set to the same value as was passed into
  31 /// this function in RegisterContext and with CommBuffer (and CommBufferSize) pointing
  32 /// to an instance of EFI_SMM_SW_CONTEXT indicating the index of the CPU which generated the
  33 /// software SMI.
  34 ///
  35 typedef struct {
  36   ///
  37   /// The 0-based index of the CPU which generated the software SMI.
  38   ///
  39   UINTN SwSmiCpuIndex;
  40   ///
  41   /// This value corresponds directly to the CommandPort parameter used in the call to Trigger().
  42   ///
  43   UINT8 CommandPort;
  44   ///
  45   /// This value corresponds directly to the DataPort parameter used in the call to Trigger().
  46   ///
  47   UINT8 DataPort;
  48 } EFI_SMM_SW_CONTEXT;
  49
  50 typedef struct _EFI_SMM_SW_DISPATCH2_PROTOCOL  EFI_SMM_SW_DISPATCH2_PROTOCOL;
  51
  52 /**
  53   Register a child SMI source dispatch function for the specified software SMI.
  54
  55   This service registers a function (DispatchFunction) which will be called when the software
  56   SMI source specified by RegisterContext->SwSmiCpuIndex is detected. On return,
  57   DispatchHandle contains a unique handle which may be used later to unregister the function
  58   using UnRegister().
  59
  60   @param[in]  This                 Pointer to the EFI_SMM_SW_DISPATCH2_PROTOCOL instance.
  61   @param[in]  DispatchFunction     Function to register for handler when the specified software
  62                                    SMI is generated.
  63   @param[in, out] RegisterContext  Pointer to the dispatch function's context.
  64                                    The caller fills this context in before calling
  65                                    the register function to indicate to the register
  66                                    function which Software SMI input value the
  67                                    dispatch function should be invoked for.
  68   @param[out] DispatchHandle       Handle generated by the dispatcher to track the
  69                                    function instance.
  70
  71   @retval EFI_SUCCESS            The dispatch function has been successfully
  72                                  registered and the SMI source has been enabled.
  73   @retval EFI_DEVICE_ERROR       The SW driver was unable to enable the SMI source.
  74   @retval EFI_INVALID_PARAMETER  RegisterContext is invalid. The SW SMI input value
  75                                  is not within a valid range or is already in use.
  76   @retval EFI_OUT_OF_RESOURCES   There is not enough memory (system or SMM) to manage this
  77                                  child.
  78   @retval EFI_OUT_OF_RESOURCES   A unique software SMI value could not be assigned
  79                                  for this dispatch.
  80 **/
  81 typedef
  82 EFI_STATUS
  83 (EFIAPI *EFI_SMM_SW_REGISTER2)(
  84   IN  CONST EFI_SMM_SW_DISPATCH2_PROTOCOL  *This,
  85   IN        EFI_SMM_HANDLER_ENTRY_POINT2   DispatchFunction,
  86   IN  OUT   EFI_SMM_SW_REGISTER_CONTEXT    *RegisterContext,
  87   OUT       EFI_HANDLE                     *DispatchHandle
  88   );
  89
  90 /**
  91   Unregister a child SMI source dispatch function for the specified software SMI.
  92
  93   This service removes the handler associated with DispatchHandle so that it will no longer be
  94   called in response to a software SMI.
  95
  96   @param[in] This                Pointer to the EFI_SMM_SW_DISPATCH2_PROTOCOL instance.
  97   @param[in] DispatchHandle      Handle of dispatch function to deregister.
  98
  99   @retval EFI_SUCCESS            The dispatch function has been successfully unregistered.
 100   @retval EFI_INVALID_PARAMETER  The DispatchHandle was not valid.
 101 **/
 102 typedef
 103 EFI_STATUS
 104 (EFIAPI *EFI_SMM_SW_UNREGISTER2)(
 105   IN CONST EFI_SMM_SW_DISPATCH2_PROTOCOL  *This,
 106   IN       EFI_HANDLE                     DispatchHandle
 107 );
 108
 109 ///
 110 /// Interface structure for the SMM Software SMI Dispatch Protocol.
 111 ///
 112 /// The EFI_SMM_SW_DISPATCH2_PROTOCOL provides the ability to install child handlers for the
 113 /// given software.  These handlers will respond to software interrupts, and the maximum software
 114 /// interrupt in the EFI_SMM_SW_REGISTER_CONTEXT is denoted by MaximumSwiValue.
 115 ///
 116 struct _EFI_SMM_SW_DISPATCH2_PROTOCOL {
 117   EFI_SMM_SW_REGISTER2    Register;
 118   EFI_SMM_SW_UNREGISTER2  UnRegister;
 119   ///
 120   /// A read-only field that describes the maximum value that can be used in the
 121   /// EFI_SMM_SW_DISPATCH2_PROTOCOL.Register() service.
 122   ///
 123   UINTN                  MaximumSwiValue;
 124 };
 125
 126 extern EFI_GUID gEfiSmmSwDispatch2ProtocolGuid;
 127
 128 #endif