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Correct element description of EFI_SMM_PERIODIC_TIMER_DISPATCH_CONTEXT. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8717 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
xli24 2009-07-02 03:33:49 +00:00
parent c41da1c6a6
commit 358e78ed4c
1 changed files with 17 additions and 31 deletions
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48
IntelFrameworkPkg/Include/Protocol/SmmPeriodicTimerDispatch.h
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@ -1,7 +1,7 @@
/** @file /** @file
Provides the parent dispatch service for the periodical timer SMI source generator. Provides the parent dispatch service for the periodical timer SMI source generator.
Copyright (c) 2007, Intel Corporation Copyright (c) 2007 - 2009, Intel Corporation
All rights reserved. This program and the accompanying materials All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at which accompanies this distribution. The full text of the license may be found at
@ -36,39 +36,25 @@ typedef struct _EFI_SMM_PERIODIC_TIMER_DISPATCH_PROTOCOL EFI_SMM_PERIODIC_TIMER
// //
// Related Definitions // Related Definitions
// //
//
// Period is the minimum period of time in 100 nanosecond units that child gets called.
// The child will be called back after a time greater than the time Period.
//
// SmiTickInterval is the period of time interval between SMIs. Children of this interface
// should use this field when registering for periodic timer intervals when a finer
// granularity periodic SMI is desired. Valid values for this field are those returned
// by GetNextInterval. A value of 0 indicates the parent is allowed to use any SMI
// interval period to satisfy the requested period.
// Example: A chipset supports periodic SMIs on every 64ms or 2 seconds.
// A child wishes schedule a period SMI to fire on a period of 3 seconds, there
// are several ways to approach the problem:
// 1. The child may accept a 4 second periodic rate, in which case it registers with
// Period = 40000
// SmiTickInterval = 20000
// The resulting SMI will occur every 2 seconds with the child called back on
// every 2nd SMI.
// NOTE: the same result would occur if the child set SmiTickInterval = 0.
// 2. The child may choose the finer granularity SMI (64ms):
// Period = 30000
// SmiTickInterval = 640
// The resulting SMI will occur every 64ms with the child called back on
// every 47th SMI.
// NOTE: the child driver should be aware that this will result in more
// SMIs occuring during system runtime which can negatively impact system
// performance.
//
// ElapsedTime is the actual time in 100 nanosecond units elapsed since last called, a
// value of 0 indicates an unknown amount of time.
//
typedef struct { typedef struct {
///
/// The minimum period of time in 100 nanosecond units that child gets called.
/// The child will be called back after a time greater than the time Period.
///
UINT64 Period; UINT64 Period;
///
/// The period of time interval between SMIs. Children of this interface
/// should use this field when registering for periodic timer intervals when a finer
/// granularity periodic SMI is desired. Valid values for this field are those returned
/// by GetNextInterval. A value of 0 indicates the parent is allowed to use any SMI
/// interval period to satisfy the requested period.
///
UINT64 SmiTickInterval; UINT64 SmiTickInterval;
///
/// The actual time in 100 nanosecond units elapsed since last called, a
/// value of 0 indicates an unknown amount of time.
///
UINT64 ElapsedTime; UINT64 ElapsedTime;
} EFI_SMM_PERIODIC_TIMER_DISPATCH_CONTEXT; } EFI_SMM_PERIODIC_TIMER_DISPATCH_CONTEXT;