Check in DxeCore for Nt32 platform. Currently, it does not follow PI/UEFI2.1.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3045 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
yshang1
388
MdeModulePkg/Core/Dxe/Event/timer.c
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388
MdeModulePkg/Core/Dxe/Event/timer.c
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@ -0,0 +1,388 @@
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/*++
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Copyright (c) 2006, Intel Corporation
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All rights reserved. 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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Module Name:
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timer.c
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Abstract:
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EFI Event support
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Revision History
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--*/
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#include <DxeMain.h>
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//
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// Internal prototypes
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//
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STATIC
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UINT64
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CoreCurrentSystemTime (
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VOID
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);
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STATIC
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VOID
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EFIAPI
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CoreCheckTimers (
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IN EFI_EVENT Event,
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IN VOID *Context
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);
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STATIC
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VOID
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CoreInsertEventTimer (
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IN IEVENT *Event
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);
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//
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// Internal data
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//
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static LIST_ENTRY mEfiTimerList = INITIALIZE_LIST_HEAD_VARIABLE (mEfiTimerList);
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static EFI_LOCK mEfiTimerLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL - 1);
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static EFI_EVENT mEfiCheckTimerEvent;
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static EFI_LOCK mEfiSystemTimeLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL);
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static UINT64 mEfiSystemTime = 0;
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//
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// Timer functions
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//
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VOID
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CoreInitializeTimer (
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VOID
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)
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/*++
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Routine Description:
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Initializes timer support
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Arguments:
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None
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Returns:
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None
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--*/
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{
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EFI_STATUS Status;
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Status = CoreCreateEvent (
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EVT_NOTIFY_SIGNAL,
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TPL_HIGH_LEVEL - 1,
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CoreCheckTimers,
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NULL,
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&mEfiCheckTimerEvent
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);
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ASSERT_EFI_ERROR (Status);
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}
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STATIC
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UINT64
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CoreCurrentSystemTime (
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VOID
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)
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/*++
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Routine Description:
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Returns the current system time
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Arguments:
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None
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Returns:
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Returns the current system time
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--*/
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{
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UINT64 SystemTime;
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CoreAcquireLock (&mEfiSystemTimeLock);
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SystemTime = mEfiSystemTime;
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CoreReleaseLock (&mEfiSystemTimeLock);
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return SystemTime;
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}
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VOID
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EFIAPI
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CoreTimerTick (
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IN UINT64 Duration
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)
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/*++
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Routine Description:
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Called by the platform code to process a tick.
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Arguments:
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Duration - The number of 100ns elasped since the last call to TimerTick
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Returns:
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None
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--*/
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{
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IEVENT *Event;
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//
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// Check runtiem flag in case there are ticks while exiting boot services
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//
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CoreAcquireLock (&mEfiSystemTimeLock);
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//
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// Update the system time
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//
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mEfiSystemTime += Duration;
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//
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// If the head of the list is expired, fire the timer event
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// to process it
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//
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if (!IsListEmpty (&mEfiTimerList)) {
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Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);
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if (Event->u.Timer.TriggerTime <= mEfiSystemTime) {
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CoreSignalEvent (mEfiCheckTimerEvent);
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}
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}
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CoreReleaseLock (&mEfiSystemTimeLock);
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}
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STATIC
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VOID
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EFIAPI
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CoreCheckTimers (
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IN EFI_EVENT CheckEvent,
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IN VOID *Context
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)
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/*++
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Routine Description:
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Checks the sorted timer list against the current system time.
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Signals any expired event timer.
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Arguments:
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CheckEvent - Not used
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Context - Not used
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Returns:
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None
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--*/
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{
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UINT64 SystemTime;
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IEVENT *Event;
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//
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// Check the timer database for expired timers
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//
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CoreAcquireLock (&mEfiTimerLock);
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SystemTime = CoreCurrentSystemTime ();
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while (!IsListEmpty (&mEfiTimerList)) {
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Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);
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//
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// If this timer is not expired, then we're done
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//
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if (Event->u.Timer.TriggerTime > SystemTime) {
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break;
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}
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//
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// Remove this timer from the timer queue
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//
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RemoveEntryList (&Event->u.Timer.Link);
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Event->u.Timer.Link.ForwardLink = NULL;
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//
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// Signal it
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//
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CoreSignalEvent (Event);
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//
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// If this is a periodic timer, set it
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//
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if (Event->u.Timer.Period) {
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//
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// Compute the timers new trigger time
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//
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Event->u.Timer.TriggerTime = Event->u.Timer.TriggerTime + Event->u.Timer.Period;
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//
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// If that's before now, then reset the timer to start from now
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//
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if (Event->u.Timer.TriggerTime <= SystemTime) {
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Event->u.Timer.TriggerTime = SystemTime;
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CoreSignalEvent (mEfiCheckTimerEvent);
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}
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//
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// Add the timer
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//
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CoreInsertEventTimer (Event);
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}
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}
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CoreReleaseLock (&mEfiTimerLock);
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}
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STATIC
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VOID
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CoreInsertEventTimer (
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IN IEVENT *Event
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)
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/*++
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Routine Description:
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Inserts the timer event
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Arguments:
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Event - Points to the internal structure of timer event to be installed
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Returns:
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None
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--*/
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{
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UINT64 TriggerTime;
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LIST_ENTRY *Link;
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IEVENT *Event2;
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ASSERT_LOCKED (&mEfiTimerLock);
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//
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// Get the timer's trigger time
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//
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TriggerTime = Event->u.Timer.TriggerTime;
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//
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// Insert the timer into the timer database in assending sorted order
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//
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for (Link = mEfiTimerList.ForwardLink; Link != &mEfiTimerList; Link = Link->ForwardLink) {
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Event2 = CR (Link, IEVENT, u.Timer.Link, EVENT_SIGNATURE);
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if (Event2->u.Timer.TriggerTime > TriggerTime) {
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break;
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}
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}
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InsertTailList (Link, &Event->u.Timer.Link);
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}
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EFI_STATUS
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EFIAPI
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CoreSetTimer (
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IN EFI_EVENT UserEvent,
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IN EFI_TIMER_DELAY Type,
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IN UINT64 TriggerTime
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)
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/*++
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Routine Description:
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Sets the type of timer and the trigger time for a timer event.
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Arguments:
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UserEvent - The timer event that is to be signaled at the specified time
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Type - The type of time that is specified in TriggerTime
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TriggerTime - The number of 100ns units until the timer expires
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Returns:
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EFI_SUCCESS - The event has been set to be signaled at the requested time
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EFI_INVALID_PARAMETER - Event or Type is not valid
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--*/
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{
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IEVENT *Event;
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Event = UserEvent;
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if (Event == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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if (Event->Signature != EVENT_SIGNATURE) {
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return EFI_INVALID_PARAMETER;
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}
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if (Type < 0 || Type > TimerRelative || !(Event->Type & EVT_TIMER)) {
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return EFI_INVALID_PARAMETER;
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}
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CoreAcquireLock (&mEfiTimerLock);
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//
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// If the timer is queued to the timer database, remove it
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//
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if (Event->u.Timer.Link.ForwardLink != NULL) {
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RemoveEntryList (&Event->u.Timer.Link);
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Event->u.Timer.Link.ForwardLink = NULL;
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}
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Event->u.Timer.TriggerTime = 0;
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Event->u.Timer.Period = 0;
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if (Type != TimerCancel) {
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if (Type == TimerPeriodic) {
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Event->u.Timer.Period = TriggerTime;
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}
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Event->u.Timer.TriggerTime = CoreCurrentSystemTime () + TriggerTime;
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CoreInsertEventTimer (Event);
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if (TriggerTime == 0) {
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CoreSignalEvent (mEfiCheckTimerEvent);
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}
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}
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CoreReleaseLock (&mEfiTimerLock);
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return EFI_SUCCESS;
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}
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Block a user