IntelFrameworkPkg/Include/Protocol/SmmPeriodicTimerDispatch.h

   1 /** @file
   2   Provides the parent dispatch service for the periodical timer SMI source generator.
   3
   4   Copyright (c) 2007 - 2009, Intel Corporation
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13   @par Revision Reference:
  14   This Protocol is defined in Framework of EFI SMM Core Interface Spec
  15   Version 0.9.
  16
  17 **/
  18
  19 #ifndef _EFI_SMM_PERIODIC_TIMER_DISPATCH_H_
  20 #define _EFI_SMM_PERIODIC_TIMER_DISPATCH_H_
  21
  22
  23 //
  24 // Global ID for the Periodic Timer SMI Protocol
  25 //
  26 #define EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL_GUID \
  27   { \
  28     0x9cca03fc, 0x4c9e, 0x4a19, {0x9b, 0x6, 0xed, 0x7b, 0x47, 0x9b, 0xde, 0x55 } \
  29   }
  30
  31 typedef struct _EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL  EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL;
  32
  33 //
  34 // Related Definitions
  35 //
  36
  37 typedef struct {
  38   ///
  39   /// The minimum period of time in 100 nanosecond units that child gets called.
  40   /// The child will be called back after a time greater than the time Period.
  41   ///
  42   UINT64  Period;
  43   ///
  44   /// The period of time interval between SMIs.  Children of this interface
  45   /// should use this field when registering for periodic timer intervals when a finer
  46   /// granularity periodic SMI is desired.  Valid values for this field are those returned
  47   /// by GetNextInterval.  A value of 0 indicates the parent is allowed to use any SMI
  48   /// interval period to satisfy the requested period.
  49   ///
  50   UINT64  SmiTickInterval;
  51   ///
  52   /// The actual time in 100 nanosecond units elapsed since last called, a
  53   /// value of 0 indicates an unknown amount of time.
  54   ///
  55   UINT64  ElapsedTime;
  56 } EFI_SMM_PERIODIC_TIMER_DISPATCH_CONTEXT;
  57
  58 //
  59 // Member functions
  60 //
  61 /**
  62   Dispatch function for a Periodic Timer SMI handler.
  63
  64   @param  DispatchHandle        Handle of this dispatch function.
  65   @param  DispatchContext       Pointer to the dispatch function's context.
  66                                 The DispatchContext fields are filled in
  67                                 by the dispatching driver prior to
  68                                 invoking this dispatch function.
  69
  70   @return None
  71
  72 **/
  73 typedef
  74 VOID
  75 (EFIAPI *EFI_SMM_PERIODIC_TIMER_DISPATCH)(
  76   IN EFI_HANDLE                                DispatchHandle,
  77   IN EFI_SMM_PERIODIC_TIMER_DISPATCH_CONTEXT   *DispatchContext
  78   );
  79
  80 /**
  81   Returns the next SMI tick period supported by the chipset.  The order
  82   returned is from longest to shortest interval period.
  83
  84   @param  This                  Protocol instance pointer.
  85   @param  SmiTickInterval       Pointer to pointer of next shorter SMI interval
  86                                 period supported by the child. This parameter works as a get-first,
  87                                 get-next field.The first time this function is called, *SmiTickInterval
  88                                 should be set to NULL to get the longest SMI interval.The returned
  89                                 *SmiTickInterval should be passed in on subsequent calls to get the
  90                                 next shorter interval period until *SmiTickInterval = NULL.
  91
  92   @retval EFI_SUCCESS           The service returned successfully.
  93
  94 **/
  95 typedef
  96 EFI_STATUS
  97 (EFIAPI *EFI_SMM_PERIODIC_TIMER_INTERVAL)(
  98   IN EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL           *This,
  99   IN OUT UINT64                                         **SmiTickInterval
 100   );
 101
 102 /**
 103   Register a child SMI source dispatch function with a parent SMM driver
 104
 105   @param  This                  Pointer to the EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL instance.
 106   @param  DispatchFunction      Function to install.
 107   @param  DispatchContext       Pointer to the dispatch function's context.
 108                                 The caller fills this context in before calling
 109                                 the register function to indicate to the register
 110                                 function the period at which the dispatch function
 111                                 should be invoked.
 112   @param  DispatchHandle        Handle generated by the dispatcher to track the function instance.
 113
 114   @retval EFI_SUCCESS           The dispatch function has been successfully
 115                                 registered and the SMI source has been enabled.
 116   @retval EFI_DEVICE_ERROR      The driver was unable to enable the SMI source.
 117   @retval EFI_OUT_OF_RESOURCES  Not enough memory (system or SMM) to manage this
 118                                 child.
 119   @retval EFI_INVALID_PARAMETER DispatchContext is invalid. The period input value
 120                                 is not within valid range.
 121
 122 **/
 123 typedef
 124 EFI_STATUS
 125 (EFIAPI *EFI_SMM_PERIODIC_TIMER_REGISTER)(
 126   IN EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL          *This,
 127   IN EFI_SMM_PERIODIC_TIMER_DISPATCH                   DispatchFunction,
 128   IN EFI_SMM_PERIODIC_TIMER_DISPATCH_CONTEXT           *DispatchContext,
 129   OUT EFI_HANDLE                                       *DispatchHandle
 130   );
 131
 132 /**
 133   Unregisters a periodic timer service.
 134
 135   @param  This                  Pointer to the EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL instance.
 136   @param  DispatchHandle        Handle of the service to remove.
 137
 138   @retval EFI_SUCCESS           The dispatch function has been successfully
 139                                 unregistered and the SMI source has been disabled
 140                                 if there are no other registered child dispatch
 141                                 functions for this SMI source.
 142   @retval EFI_INVALID_PARAMETER Handle is invalid.
 143
 144 **/
 145 typedef
 146 EFI_STATUS
 147 (EFIAPI *EFI_SMM_PERIODIC_TIMER_UNREGISTER)(
 148   IN EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL          *This,
 149   IN EFI_HANDLE                                        DispatchHandle
 150   );
 151
 152 //
 153 // Interface structure for the SMM Periodic Timer Dispatch Protocol
 154 //
 155 /**
 156   Provides the parent dispatch service for the periodical timer SMI source generator.
 157 **/
 158 struct _EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL {
 159   ///
 160   /// Installs a child service to be dispatched by this protocol.
 161   ///
 162   EFI_SMM_PERIODIC_TIMER_REGISTER   Register;
 163
 164   ///
 165   /// Removes a child service dispatched by this protocol.
 166   ///
 167   EFI_SMM_PERIODIC_TIMER_UNREGISTER UnRegister;
 168
 169   ///
 170   /// Returns the next SMI tick period that is supported by the chipset.
 171   ///
 172   EFI_SMM_PERIODIC_TIMER_INTERVAL   GetNextShorterInterval;
 173 };
 174
 175 extern EFI_GUID gEfiSmmPeriodicTimerDispatchProtocolGuid;
 176
 177 #endif