diff options
Diffstat (limited to 'EDK/Foundation/Core/Dxe/Event/timer.c')
| -rw-r--r-- | EDK/Foundation/Core/Dxe/Event/timer.c | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/EDK/Foundation/Core/Dxe/Event/timer.c b/EDK/Foundation/Core/Dxe/Event/timer.c new file mode 100644 index 0000000..28ce124 --- /dev/null +++ b/EDK/Foundation/Core/Dxe/Event/timer.c @@ -0,0 +1,386 @@ +/*++ + +Copyright (c) 2004, Intel Corporation +All rights reserved. This program and the accompanying materials +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 +http://opensource.org/licenses/bsd-license.php + +THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +Module Name: + + timer.c + +Abstract: + + EFI Event support + +Revision History + +--*/ + + +#include "exec.h" + +// +// Internal prototypes +// +STATIC +UINT64 +CoreCurrentSystemTime ( + VOID + ); + +VOID +EFIAPI +CoreCheckTimers ( + IN EFI_EVENT Event, + IN VOID *Context + ); + +STATIC +VOID +CoreInsertEventTimer ( + IN IEVENT *Event + ); + +// +// Internal data +// + +static EFI_LIST_ENTRY mEfiTimerList = INITIALIZE_LIST_HEAD_VARIABLE (mEfiTimerList); +static EFI_LOCK mEfiTimerLock = EFI_INITIALIZE_LOCK_VARIABLE (EFI_TPL_HIGH_LEVEL - 1); +static EFI_EVENT mEfiCheckTimerEvent; + +static EFI_LOCK mEfiSystemTimeLock = EFI_INITIALIZE_LOCK_VARIABLE (EFI_TPL_HIGH_LEVEL); +static UINT64 mEfiSystemTime = 0; + +// +// Timer functions +// + +VOID +CoreInitializeTimer ( + VOID + ) +/*++ + +Routine Description: + + Initializes timer support + +Arguments: + + None + +Returns: + + None + +--*/ +{ + EFI_STATUS Status; + + Status = CoreCreateEvent ( + EFI_EVENT_NOTIFY_SIGNAL, + EFI_TPL_HIGH_LEVEL - 1, + CoreCheckTimers, + NULL, + &mEfiCheckTimerEvent + ); + ASSERT_EFI_ERROR (Status); +} + +STATIC +UINT64 +CoreCurrentSystemTime ( + VOID + ) +/*++ + +Routine Description: + + Returns the current system time + +Arguments: + + None + +Returns: + + Returns the current system time + +--*/ +{ + UINT64 SystemTime; + + CoreAcquireLock (&mEfiSystemTimeLock); + SystemTime = mEfiSystemTime; + CoreReleaseLock (&mEfiSystemTimeLock); + return SystemTime; +} + +VOID +EFIAPI +CoreTimerTick ( + IN UINT64 Duration + ) +/*++ + +Routine Description: + + Called by the platform code to process a tick. + +Arguments: + + Duration - The number of 100ns elasped since the last call to TimerTick + +Returns: + + None + +--*/ +{ + IEVENT *Event; + + // + // Check runtiem flag in case there are ticks while exiting boot services + // + + CoreAcquireLock (&mEfiSystemTimeLock); + + // + // Update the system time + // + + mEfiSystemTime += Duration; + + // + // If the head of the list is expired, fire the timer event + // to process it + // + + if (!IsListEmpty (&mEfiTimerList)) { + Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE); + + if (Event->u.Timer.TriggerTime <= mEfiSystemTime) { + CoreSignalEvent (mEfiCheckTimerEvent); + } + } + + CoreReleaseLock (&mEfiSystemTimeLock); +} + +VOID +EFIAPI +CoreCheckTimers ( + IN EFI_EVENT CheckEvent, + IN VOID *Context + ) +/*++ + +Routine Description: + + Checks the sorted timer list against the current system time. + Signals any expired event timer. + +Arguments: + + CheckEvent - Not used + + Context - Not used + +Returns: + + None + +--*/ +{ + UINT64 SystemTime; + IEVENT *Event; + + // + // Check the timer database for expired timers + // + + CoreAcquireLock (&mEfiTimerLock); + SystemTime = CoreCurrentSystemTime (); + + while (!IsListEmpty (&mEfiTimerList)) { + Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE); + + // + // If this timer is not expired, then we're done + // + + if (Event->u.Timer.TriggerTime > SystemTime) { + break; + } + + // + // Remove this timer from the timer queue + // + + RemoveEntryList (&Event->u.Timer.Link); + Event->u.Timer.Link.ForwardLink = NULL; + + // + // Signal it + // + CoreSignalEvent (Event); + + // + // If this is a periodic timer, set it + // + if (Event->u.Timer.Period) { + + // + // Compute the timers new trigger time + // + + Event->u.Timer.TriggerTime = Event->u.Timer.TriggerTime + Event->u.Timer.Period; + + // + // If that's before now, then reset the timer to start from now + // + if (Event->u.Timer.TriggerTime <= SystemTime) { + Event->u.Timer.TriggerTime = SystemTime; + CoreSignalEvent (mEfiCheckTimerEvent); + } + + // + // Add the timer + // + + CoreInsertEventTimer (Event); + } + } + + CoreReleaseLock (&mEfiTimerLock); +} + +STATIC +VOID +CoreInsertEventTimer ( + IN IEVENT *Event + ) +/*++ + +Routine Description: + + Inserts the timer event + +Arguments: + + Event - Points to the internal structure of timer event to be installed + +Returns: + + None + +--*/ +{ + UINT64 TriggerTime; + EFI_LIST_ENTRY *Link; + IEVENT *Event2; + + ASSERT_LOCKED (&mEfiTimerLock); + + // + // Get the timer's trigger time + // + + TriggerTime = Event->u.Timer.TriggerTime; + + // + // Insert the timer into the timer database in assending sorted order + // + + for (Link = mEfiTimerList.ForwardLink; Link != &mEfiTimerList; Link = Link->ForwardLink) { + Event2 = CR (Link, IEVENT, u.Timer.Link, EVENT_SIGNATURE); + + if (Event2->u.Timer.TriggerTime > TriggerTime) { + break; + } + } + + InsertTailList (Link, &Event->u.Timer.Link); +} + + +EFI_BOOTSERVICE +EFI_STATUS +EFIAPI +CoreSetTimer ( + IN EFI_EVENT UserEvent, + IN EFI_TIMER_DELAY Type, + IN UINT64 TriggerTime + ) +/*++ + +Routine Description: + + Sets the type of timer and the trigger time for a timer event. + +Arguments: + + UserEvent - The timer event that is to be signaled at the specified time + Type - The type of time that is specified in TriggerTime + TriggerTime - The number of 100ns units until the timer expires + +Returns: + + EFI_SUCCESS - The event has been set to be signaled at the requested time + EFI_INVALID_PARAMETER - Event or Type is not valid + +--*/ +{ + IEVENT *Event; + + Event = UserEvent; + + if (Event == NULL) { + return EFI_INVALID_PARAMETER; + } + + if (Event->Signature != EVENT_SIGNATURE) { + return EFI_INVALID_PARAMETER; + } + + if (Type < 0 || Type >= TimerTypeMax || !(Event->Type & EFI_EVENT_TIMER)) { + return EFI_INVALID_PARAMETER; + } + + CoreAcquireLock (&mEfiTimerLock); + + // + // If the timer is queued to the timer database, remove it + // + + if (Event->u.Timer.Link.ForwardLink != NULL) { + RemoveEntryList (&Event->u.Timer.Link); + Event->u.Timer.Link.ForwardLink = NULL; + } + + Event->u.Timer.TriggerTime = 0; + Event->u.Timer.Period = 0; + + if (Type != TimerCancel) { + + if (Type == TimerPeriodic) { + Event->u.Timer.Period = TriggerTime; + } + + Event->u.Timer.TriggerTime = CoreCurrentSystemTime () + TriggerTime; + CoreInsertEventTimer (Event); + + if (TriggerTime == 0) { + CoreSignalEvent (mEfiCheckTimerEvent); + } + } + + CoreReleaseLock (&mEfiTimerLock); + return EFI_SUCCESS; +} |