9df063a06a
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10403 6f19259b-4bc3-4df7-8a09-765794883524
171 lines
7.5 KiB
C
171 lines
7.5 KiB
C
/** @file
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SMM Periodic Timer Dispatch Protocol as defined in PI 1.1 Specification
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Volume 4 System Management Mode Core Interface.
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This protocol provides the parent dispatch service for the periodical timer SMI source generator.
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Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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@par Revision Reference:
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This protocol is from PI Version 1.1.
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**/
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#ifndef _SMM_PERIODIC_TIMER_DISPATCH2_H_
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#define _SMM_PERIODIC_TIMER_DISPATCH2_H_
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#include <Pi/PiSmmCis.h>
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#define EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL_GUID \
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{ \
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0x4cec368e, 0x8e8e, 0x4d71, {0x8b, 0xe1, 0x95, 0x8c, 0x45, 0xfc, 0x8a, 0x53 } \
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}
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///
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/// Example: A chipset supports periodic SMIs on every 64ms or 2 seconds.
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/// A child wishes schedule a period SMI to fire on a period of 3 seconds, there
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/// are several ways to approach the problem:
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/// 1. The child may accept a 4 second periodic rate, in which case it registers with
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/// Period = 40000
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/// SmiTickInterval = 20000
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/// The resulting SMI will occur every 2 seconds with the child called back on
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/// every 2nd SMI.
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/// NOTE: the same result would occur if the child set SmiTickInterval = 0.
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/// 2. The child may choose the finer granularity SMI (64ms):
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/// Period = 30000
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/// SmiTickInterval = 640
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/// The resulting SMI will occur every 64ms with the child called back on
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/// every 47th SMI.
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/// NOTE: the child driver should be aware that this will result in more
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/// SMIs occuring during system runtime which can negatively impact system
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/// performance.
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///
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typedef struct {
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///
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/// The minimum period of time in 100 nanosecond units that the child gets called. The
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/// child will be called back after a time greater than the time Period.
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///
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UINT64 Period;
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///
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/// The period of time interval between SMIs. Children of this interface should use this
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/// field when registering for periodic timer intervals when a finer granularity periodic
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/// SMI is desired.
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///
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UINT64 SmiTickInterval;
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} EFI_SMM_PERIODIC_TIMER_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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/// Register() in RegisterContext and with CommBuffer pointing to an instance of
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/// EFI_SMM_PERIODIC_TIMER_CONTEXT and CommBufferSize pointing to its size.
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///
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typedef struct {
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///
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/// ElapsedTime is the actual time in 100 nanosecond units elapsed since last called, a
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/// value of 0 indicates an unknown amount of time.
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///
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UINT64 ElapsedTime;
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} EFI_SMM_PERIODIC_TIMER_CONTEXT;
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typedef struct _EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL;
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/**
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Register a child SMI source dispatch function for SMM periodic timer.
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This service registers a function (DispatchFunction) which will be called when at least the
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amount of time specified by RegisterContext has elapsed. On return, DispatchHandle
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contains a unique handle which may be used later to unregister the function 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 an instance of
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EFI_SMM_PERIODIC_TIMER_CONTEXT and CommBufferSize pointing to its size.
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@param[in] This Pointer to the EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL instance.
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@param[in] DispatchFunction Function to register for handler when at least the specified amount
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of time has elapsed.
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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 period at 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 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 driver was unable to enable the SMI source.
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@retval EFI_INVALID_PARAMETER RegisterContext is invalid. The period 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 SMM) 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_SMM_PERIODIC_TIMER_REGISTER2)(
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IN CONST EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL *This,
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IN EFI_SMM_HANDLER_ENTRY_POINT2 DispatchFunction,
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IN CONST EFI_SMM_PERIODIC_TIMER_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 periodic timer 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 time has elapsed.
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@param[in] This Pointer to the EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL instance.
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@param[in] DispatchHandle Handle of the service to remove.
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@retval EFI_SUCCESS The service has been successfully removed.
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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_PERIODIC_TIMER_UNREGISTER2)(
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IN CONST EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL *This,
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IN EFI_HANDLE DispatchHandle
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);
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/**
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Returns the next SMI tick period supported by the chipset.
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The order returned is from longest to shortest interval period.
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@param[in] This Pointer to the EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL instance.
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@param[in,out] SmiTickInterval Pointer to pointer of next shorter SMI interval
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period supported by the child. This parameter works as a get-first,
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get-next field.The first time this function is called, *SmiTickInterval
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should be set to NULL to get the longest SMI interval.The returned
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*SmiTickInterval should be passed in on subsequent calls to get the
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next shorter interval period until *SmiTickInterval = NULL.
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@retval EFI_SUCCESS The service returned successfully.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMM_PERIODIC_TIMER_INTERVAL2)(
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IN CONST EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL *This,
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IN OUT UINT64 **SmiTickInterval
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);
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///
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/// Interface structure for the SMM Periodic Timer Dispatch Protocol
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///
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/// This protocol provides the parent dispatch service for the periodical timer SMI source generator.
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///
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struct _EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL {
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EFI_SMM_PERIODIC_TIMER_REGISTER2 Register;
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EFI_SMM_PERIODIC_TIMER_UNREGISTER2 UnRegister;
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EFI_SMM_PERIODIC_TIMER_INTERVAL2 GetNextShorterInterval;
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};
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extern EFI_GUID gEfiSmmPeriodicTimerDispatch2ProtocolGuid;
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#endif
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