diff options
Diffstat (limited to 'HisiPkg/Drivers/TimerDxe/TimerDxe.c')
| -rw-r--r-- | HisiPkg/Drivers/TimerDxe/TimerDxe.c | 557 |
1 files changed, 557 insertions, 0 deletions
diff --git a/HisiPkg/Drivers/TimerDxe/TimerDxe.c b/HisiPkg/Drivers/TimerDxe/TimerDxe.c new file mode 100644 index 000000000..77bc73c20 --- /dev/null +++ b/HisiPkg/Drivers/TimerDxe/TimerDxe.c @@ -0,0 +1,557 @@ +/** @file
+ Timer Architecture Protocol driver of the ARM flavor
+
+ Copyright (c) 2011 ARM Ltd. All rights reserved.<BR>
+ Copyright (c) Huawei Technologies Co., Ltd. 2013. 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.
+
+**/
+
+
+#include <PiDxe.h>
+
+#include <Library/ArmLib.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+#include <Library/PcdLib.h>
+#include <Library/IoLib.h>
+#include <Library/ArmArchTimer.h>
+
+#include <Protocol/Timer.h>
+#include <Protocol/HardwareInterrupt.h>
+
+// The notification function to call on every timer interrupt.
+EFI_TIMER_NOTIFY mTimerNotifyFunction = (EFI_TIMER_NOTIFY)NULL;
+EFI_EVENT EfiExitBootServicesEvent = (EFI_EVENT)NULL;
+
+// The current period of the timer interrupt
+UINT64 mTimerPeriod = 0;
+
+// Cached copy of the Hardware Interrupt protocol instance
+EFI_HARDWARE_INTERRUPT_PROTOCOL *gInterrupt = NULL;
+
+#define SRE_HITIMER_ADDR 0xe3000000
+
+#define SRE_HITIMER32_OFFSET (0x00000020)
+
+/****************** Timer32 register addresses offset start ***********************/
+#define SRE_HITIMER32_LOAD_OFFSET (0x0)
+#define SRE_HITIMER32_VALUE_OFFSET (0x4)
+#define SRE_HITIMER32_CNTL_OFFSET (0x8)
+#define SRE_HITIMER32_INTC_OFFSET (0xC)
+#define SRE_HITIMER32_RIS_OFFSET (0x10)
+#define SRE_HITIMER32_MIS_OFFSET (0x0014)
+#define SRE_HITIMER32_BGLOAD_OFFSET (0x18)
+/****************** end ******************************/
+
+#define SRE_HITIMER_NUM 48
+#define SRE_HITIMER64_START_INDEX 32
+#define SRE_HITIMER_ENCLK_SEL_BIT (1 << 7) /* Timer enable flag */
+
+
+#define SRE_HITIMER_CLK_IN_FREQ 187500000
+#define SRE_HITIMER_MICROSECOND_PER_SECOND 1000000
+
+#define SRE_HITIMER_DEFAULT_TICKS 100
+#define SRE_HITIMER_RELOAD_TICKS 1
+
+#define SRE_HITIMER_INT_CLEAR (0x01)
+#define SRE_HITIMER_CNTL_ENABLE (0x80)
+#define SRE_HITIMER_CNTL_MODE (0x40)
+#define SRE_HITIMER_CNTL_IRQ_ENABLE (0x20)
+#define SRE_HITIMER_CNTL_SIZEMODE (0x2)
+
+
+#define SRE_HITIMER_CNTL_MODE_ONCE 0
+#define SRE_HITIMER_CNTL_MODE_CYCLE 1
+#define SRE_HITIMER_CNTL_IRQ_ON 1
+#define SRE_HITIMER_CNTL_IRQ_OFF 0
+
+
+#define SRE_D01_HITIMER01_INTVEC (256)
+#define SRE_D01_HITIMER23_INTVEC (257)
+#define SRE_D01_HITIMER45_INTVEC (258)
+#define SRE_D01_HITIMER67_INTVEC (259)
+#define SRE_D01_HITIMER89_INTVEC (260)
+#define SRE_D01_HITIMER1011_INTVEC (261)
+#define SRE_D01_HITIMER1213_INTVEC (262)
+#define SRE_D01_HITIMER1415_INTVEC (263)
+#define SRE_D01_HITIMER1617_INTVEC (264)
+#define SRE_D01_HITIMER1819_INTVEC (265)
+#define SRE_D01_HITIMER2021_INTVEC (266)
+#define SRE_D01_HITIMER2223_INTVEC (267)
+#define SRE_D01_HITIMER2425_INTVEC (268)
+#define SRE_D01_HITIMER2627_INTVEC (269)
+#define SRE_D01_HITIMER2829_INTVEC (270)
+#define SRE_D01_HITIMER3031_INTVEC (271)
+#define SRE_D01_HITIMER3233_INTVEC (272)
+#define SRE_D01_HITIMER3435_INTVEC (273)
+#define SRE_D01_HITIMER3637_INTVEC (274)
+#define SRE_D01_HITIMER3839_INTVEC (275)
+#define SRE_D01_HITIMER4041_INTVEC (276)
+#define SRE_D01_HITIMER4243_INTVEC (277)
+#define SRE_D01_HITIMER4445_INTVEC (278)
+#define SRE_D01_HITIMER4647_INTVEC (279)
+
+UINT32 gRegBase = SRE_HITIMER_ADDR;
+#define SC_CTRL 0xe3e00000
+
+void HITIMER_Start()
+{
+ UINT32 ulRegAddr;
+ UINT32 ulVal = 0;
+ UINT32 ulMask;
+
+ ulVal = *(UINT32*)SC_CTRL;
+ ulVal |= BIT17 | BIT16 | BIT18 | BIT19;
+ *(UINT32*)SC_CTRL = ulVal;
+
+ /*timer mode*/
+ ulMask = SRE_HITIMER_CNTL_MODE; //BIT6
+ ulRegAddr = gRegBase + SRE_HITIMER32_CNTL_OFFSET;
+ ulVal = *(UINT32*)ulRegAddr;
+ ulVal = ulVal;
+ ulVal |= ulMask; /*cycle*/
+ *(UINT32*)ulRegAddr = ulVal;
+
+ /*int mode*/
+ ulMask = SRE_HITIMER_CNTL_IRQ_ENABLE; //BIT5
+ ulRegAddr = gRegBase + SRE_HITIMER32_CNTL_OFFSET;
+ ulVal = *(UINT32*)ulRegAddr;
+ ulVal = ulVal;
+ ulVal |= ulMask;
+ //DEBUG((EFI_D_ERROR, "int mode = %0x at %0x\n", ulVal, ulRegAddr));
+ *(UINT32*)ulRegAddr = ulVal;
+
+ /*start up*/
+ ulMask = (SRE_HITIMER_ENCLK_SEL_BIT | SRE_HITIMER_CNTL_SIZEMODE); //BIT7 | BIT1
+ ulRegAddr = gRegBase + SRE_HITIMER32_CNTL_OFFSET;
+ ulVal = *(UINT32*)ulRegAddr;
+ ulVal = ulVal;
+ ulVal |= ulMask;
+ //DEBUG((EFI_D_ERROR, "start up = %0x at %0x\n", ulVal, ulRegAddr));
+ *(UINT32*)ulRegAddr = ulVal;
+
+}
+
+void HITMER_ClearInt()
+{
+ UINT32 ulRegAddr;
+ UINT32 ulVal = 0;
+
+
+ ulRegAddr = gRegBase + SRE_HITIMER32_INTC_OFFSET;
+ ulVal = SRE_HITIMER_INT_CLEAR;
+ //DEBUG((EFI_D_ERROR, "HITMER_ClearInt = %0x at %0x\n", ulVal, ulRegAddr));
+ *(UINT32*)ulRegAddr = ulVal;
+
+}
+
+void DisableTimer()
+{
+ UINT32 ulRegAddr;
+ UINT32 ulVal = 0;
+ UINT32 ulMask;
+
+ /*disable*/
+ ulMask = SRE_HITIMER_ENCLK_SEL_BIT;
+ ulRegAddr = gRegBase + SRE_HITIMER32_CNTL_OFFSET;
+ ulVal = *(UINT32*)ulRegAddr;
+ ulVal = ulVal;
+ ulVal &= (~ulMask);
+ //DEBUG((EFI_D_ERROR, "DisableTimer = %0x at %0x\n", ulVal, ulRegAddr));
+ *(UINT32*)ulRegAddr = ulVal;
+
+}
+
+void EnableTimer()
+{
+ UINT32 ulRegAddr;
+ UINT32 ulVal = 1;
+ UINT32 ulMask;
+
+ /*disable*/
+ ulMask = SRE_HITIMER_ENCLK_SEL_BIT;
+ ulRegAddr = gRegBase + SRE_HITIMER32_CNTL_OFFSET;
+ ulVal = *(UINT32*)ulRegAddr;
+ ulVal = ulVal;
+ ulVal |= ulMask;
+ //DEBUG((EFI_D_ERROR, "EnableTimer = %0x at %0x\n", ulVal, ulRegAddr));
+ *(UINT32*)ulRegAddr = ulVal;
+
+}
+
+/**
+ This function registers the handler NotifyFunction so it is called every time
+ the timer interrupt fires. It also passes the amount of time since the last
+ handler call to the NotifyFunction. If NotifyFunction is NULL, then the
+ handler is unregistered. If the handler is registered, then EFI_SUCCESS is
+ returned. If the CPU does not support registering a timer interrupt handler,
+ then EFI_UNSUPPORTED is returned. If an attempt is made to register a handler
+ when a handler is already registered, then EFI_ALREADY_STARTED is returned.
+ If an attempt is made to unregister a handler when a handler is not registered,
+ then EFI_INVALID_PARAMETER is returned. If an error occurs attempting to
+ register the NotifyFunction with the timer interrupt, then EFI_DEVICE_ERROR
+ is returned.
+
+ @param This The EFI_TIMER_ARCH_PROTOCOL instance.
+ @param NotifyFunction The function to call when a timer interrupt fires. This
+ function executes at TPL_HIGH_LEVEL. The DXE Core will
+ register a handler for the timer interrupt, so it can know
+ how much time has passed. This information is used to
+ signal timer based events. NULL will unregister the handler.
+ @retval EFI_SUCCESS The timer handler was registered.
+ @retval EFI_UNSUPPORTED The platform does not support timer interrupts.
+ @retval EFI_ALREADY_STARTED NotifyFunction is not NULL, and a handler is already
+ registered.
+ @retval EFI_INVALID_PARAMETER NotifyFunction is NULL, and a handler was not
+ previously registered.
+ @retval EFI_DEVICE_ERROR The timer handler could not be registered.
+
+**/
+EFI_STATUS
+EFIAPI
+TimerDriverRegisterHandler (
+ IN EFI_TIMER_ARCH_PROTOCOL *This,
+ IN EFI_TIMER_NOTIFY NotifyFunction
+ )
+{
+ if ((NotifyFunction == NULL) && (mTimerNotifyFunction == NULL)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((NotifyFunction != NULL) && (mTimerNotifyFunction != NULL)) {
+ return EFI_ALREADY_STARTED;
+ }
+
+ mTimerNotifyFunction = NotifyFunction;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Disable the timer
+**/
+VOID
+EFIAPI
+ExitBootServicesEvent (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ DisableTimer ();
+}
+
+/**
+
+ This function adjusts the period of timer interrupts to the value specified
+ by TimerPeriod. If the timer period is updated, then the selected timer
+ period is stored in EFI_TIMER.TimerPeriod, and EFI_SUCCESS is returned. If
+ the timer hardware is not programmable, then EFI_UNSUPPORTED is returned.
+ If an error occurs while attempting to update the timer period, then the
+ timer hardware will be put back in its state prior to this call, and
+ EFI_DEVICE_ERROR is returned. If TimerPeriod is 0, then the timer interrupt
+ is disabled. This is not the same as disabling the CPU's interrupts.
+ Instead, it must either turn off the timer hardware, or it must adjust the
+ interrupt controller so that a CPU interrupt is not generated when the timer
+ interrupt fires.
+
+ @param This The EFI_TIMER_ARCH_PROTOCOL instance.
+ @param TimerPeriod The rate to program the timer interrupt in 100 nS units. If
+ the timer hardware is not programmable, then EFI_UNSUPPORTED is
+ returned. If the timer is programmable, then the timer period
+ will be rounded up to the nearest timer period that is supported
+ by the timer hardware. If TimerPeriod is set to 0, then the
+ timer interrupts will be disabled.
+
+
+ @retval EFI_SUCCESS The timer period was changed.
+ @retval EFI_UNSUPPORTED The platform cannot change the period of the timer interrupt.
+ @retval EFI_DEVICE_ERROR The timer period could not be changed due to a device error.
+
+**/
+EFI_STATUS
+EFIAPI
+TimerDriverSetTimerPeriod (
+ IN EFI_TIMER_ARCH_PROTOCOL *This,
+ IN UINT64 TimerPeriod
+ )
+{
+ UINT64 TimerTicks;
+
+ UINT32 ulRegAddr;
+
+ // always disable the timer
+ DisableTimer ();
+
+ if (TimerPeriod != 0) {
+ // Convert TimerPeriod to micro sec units
+ #if 0
+ TimerTicks = DivU64x32 (TimerPeriod, 10);
+
+ TimerTicks = MultU64x32 (TimerTicks, (PcdGet32(PcdArmArchTimerFreqInHz)/1000000));
+ #endif
+
+ TimerTicks = DivU64x32 (TimerPeriod, 100);
+ TimerTicks = MultU64x32 (TimerTicks, (PcdGet32(PcdArmArchTimerFreqInHz)/100000));
+
+ //ArmArchTimerSetTimerVal((UINTN)TimerTicks);
+
+ ulRegAddr = gRegBase + SRE_HITIMER32_LOAD_OFFSET;
+ //DEBUG((EFI_D_ERROR, "TimerTicks1 = %0x at %0x ======\n", TimerTicks, ulRegAddr));
+ *(UINT32*)ulRegAddr = TimerTicks;
+ ulRegAddr = gRegBase + SRE_HITIMER32_BGLOAD_OFFSET;
+ //DEBUG((EFI_D_ERROR, "TimerTicks2 = %0x at %0x \n", TimerTicks, ulRegAddr));
+ *(UINT32*)ulRegAddr = TimerTicks;
+
+ // Enable the timer
+ EnableTimer ();
+ }
+
+ // Save the new timer period
+ mTimerPeriod = TimerPeriod;
+ return EFI_SUCCESS;
+}
+
+/**
+ This function retrieves the period of timer interrupts in 100 ns units,
+ returns that value in TimerPeriod, and returns EFI_SUCCESS. If TimerPeriod
+ is NULL, then EFI_INVALID_PARAMETER is returned. If a TimerPeriod of 0 is
+ returned, then the timer is currently disabled.
+
+ @param This The EFI_TIMER_ARCH_PROTOCOL instance.
+ @param TimerPeriod A pointer to the timer period to retrieve in 100 ns units. If
+ 0 is returned, then the timer is currently disabled.
+
+
+ @retval EFI_SUCCESS The timer period was returned in TimerPeriod.
+ @retval EFI_INVALID_PARAMETER TimerPeriod is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+TimerDriverGetTimerPeriod (
+ IN EFI_TIMER_ARCH_PROTOCOL *This,
+ OUT UINT64 *TimerPeriod
+ )
+{
+ if (TimerPeriod == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ *TimerPeriod = mTimerPeriod;
+ return EFI_SUCCESS;
+}
+
+/**
+ This function generates a soft timer interrupt. If the platform does not support soft
+ timer interrupts, then EFI_UNSUPPORTED is returned. Otherwise, EFI_SUCCESS is returned.
+ If a handler has been registered through the EFI_TIMER_ARCH_PROTOCOL.RegisterHandler()
+ service, then a soft timer interrupt will be generated. If the timer interrupt is
+ enabled when this service is called, then the registered handler will be invoked. The
+ registered handler should not be able to distinguish a hardware-generated timer
+ interrupt from a software-generated timer interrupt.
+
+ @param This The EFI_TIMER_ARCH_PROTOCOL instance.
+
+ @retval EFI_SUCCESS The soft timer interrupt was generated.
+ @retval EFI_UNSUPPORTED The platform does not support the generation of soft timer interrupts.
+
+**/
+EFI_STATUS
+EFIAPI
+TimerDriverGenerateSoftInterrupt (
+ IN EFI_TIMER_ARCH_PROTOCOL *This
+ )
+{
+ return EFI_UNSUPPORTED;
+}
+
+/**
+ Interface structure for the Timer Architectural Protocol.
+
+ @par Protocol Description:
+ This protocol provides the services to initialize a periodic timer
+ interrupt, and to register a handler that is called each time the timer
+ interrupt fires. It may also provide a service to adjust the rate of the
+ periodic timer interrupt. When a timer interrupt occurs, the handler is
+ passed the amount of time that has passed since the previous timer
+ interrupt.
+
+ @param RegisterHandler
+ Registers a handler that will be called each time the
+ timer interrupt fires. TimerPeriod defines the minimum
+ time between timer interrupts, so TimerPeriod will also
+ be the minimum time between calls to the registered
+ handler.
+
+ @param SetTimerPeriod
+ Sets the period of the timer interrupt in 100 nS units.
+ This function is optional, and may return EFI_UNSUPPORTED.
+ If this function is supported, then the timer period will
+ be rounded up to the nearest supported timer period.
+
+
+ @param GetTimerPeriod
+ Retrieves the period of the timer interrupt in 100 nS units.
+
+ @param GenerateSoftInterrupt
+ Generates a soft timer interrupt that simulates the firing of
+ the timer interrupt. This service can be used to invoke the registered handler if the timer interrupt has been masked for
+ a period of time.
+
+**/
+EFI_TIMER_ARCH_PROTOCOL gTimer = {
+ TimerDriverRegisterHandler,
+ TimerDriverSetTimerPeriod,
+ TimerDriverGetTimerPeriod,
+ TimerDriverGenerateSoftInterrupt
+};
+
+/**
+
+ C Interrupt Handler called in the interrupt context when Source interrupt is active.
+
+
+ @param Source Source of the interrupt. Hardware routing off a specific platform defines
+ what source means.
+
+ @param SystemContext Pointer to system register context. Mostly used by debuggers and will
+ update the system context after the return from the interrupt if
+ modified. Don't change these values unless you know what you are doing
+
+**/
+VOID
+EFIAPI
+TimerInterruptHandler (
+ IN HARDWARE_INTERRUPT_SOURCE Source,
+ IN EFI_SYSTEM_CONTEXT SystemContext
+ )
+{
+ EFI_TPL OriginalTPL;
+
+ //
+ // DXE core uses this callback for the EFI timer tick. The DXE core uses locks
+ // that raise to TPL_HIGH and then restore back to current level. Thus we need
+ // to make sure TPL level is set to TPL_HIGH while we are handling the timer tick.
+ //
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+ OriginalTPL = gBS->RaiseTPL (TPL_HIGH_LEVEL);
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+
+ // Check if the timer interrupt is active
+ //if ((*(UINT32*)(gRegBase + SRE_HITIMER32_RIS_OFFSET)) & BIT0) {
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+ HITMER_ClearInt();
+
+ // Signal end of interrupt early to help avoid losing subsequent ticks from long duration handlers
+ gInterrupt->EndOfInterrupt (gInterrupt, Source);
+
+
+ if (mTimerNotifyFunction) {
+ mTimerNotifyFunction (mTimerPeriod);
+ }
+
+ // Reload the Timer
+ //TimerDriverSetTimerPeriod (&gTimer, FixedPcdGet32(PcdTimerPeriod));
+ //}
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+
+ // Enable timer interrupts
+ //gInterrupt->EnableInterruptSource (gInterrupt, Source);
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+
+ gBS->RestoreTPL (OriginalTPL);
+}
+
+
+
+
+/**
+ Initialize the state information for the Timer Architectural Protocol and
+ the Timer Debug support protocol that allows the debugger to break into a
+ running program.
+
+ @param ImageHandle of the loaded driver
+ @param SystemTable Pointer to the System Table
+
+ @retval EFI_SUCCESS Protocol registered
+ @retval EFI_OUT_OF_RESOURCES Cannot allocate protocol data structure
+ @retval EFI_DEVICE_ERROR Hardware problems
+
+**/
+EFI_STATUS
+EFIAPI
+TimerInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_HANDLE Handle = NULL;
+ EFI_STATUS Status;
+
+
+ // Find the interrupt controller protocol. ASSERT if not found.
+ Status = gBS->LocateProtocol (&gHardwareInterruptProtocolGuid, NULL, (VOID **)&gInterrupt);
+ ASSERT_EFI_ERROR (Status);
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+
+ // Disable the timer
+ Status = TimerDriverSetTimerPeriod (&gTimer, 0);
+ ASSERT_EFI_ERROR (Status);
+
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+ // Install secure and Non-secure interrupt handlers
+ // Note: Because it is not possible to determine the security state of the
+ // CPU dynamically, we just install interrupt handler for both sec and non-sec
+ // timer PPI
+ Status = gInterrupt->RegisterInterruptSource (gInterrupt, 256, TimerInterruptHandler);
+ ASSERT_EFI_ERROR (Status);
+
+ //Status = gInterrupt->RegisterInterruptSource (gInterrupt, PcdGet32 (PcdArmArchTimerIntrNum), TimerInterruptHandler);
+ //ASSERT_EFI_ERROR (Status);
+
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+ // Unmask timer interrupts
+ HITIMER_Start();
+
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+
+ // Set up default timer
+ Status = TimerDriverSetTimerPeriod (&gTimer, FixedPcdGet32(PcdTimerPeriod)); // TIMER_DEFAULT_PERIOD
+ ASSERT_EFI_ERROR (Status);
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+
+ // Install the Timer Architectural Protocol onto a new handle
+ Status = gBS->InstallMultipleProtocolInterfaces(
+ &Handle,
+ &gEfiTimerArchProtocolGuid, &gTimer,
+ NULL
+ );
+ ASSERT_EFI_ERROR(Status);
+ //DEBUG((EFI_D_ERROR, "[DJ]: %a : %d\n", __FUNCTION__, __LINE__));
+
+ // enable Secure timer interrupts
+ Status = gInterrupt->EnableInterruptSource (gInterrupt, 256);
+
+ // enable NonSecure timer interrupts
+ //Status = gInterrupt->EnableInterruptSource (gInterrupt, PcdGet32 (PcdArmArchTimerIntrNum));
+
+ // Register for an ExitBootServicesEvent
+ Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_NOTIFY, ExitBootServicesEvent, NULL, &EfiExitBootServicesEvent);
+ ASSERT_EFI_ERROR (Status);
+
+ return Status;
+}
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