[edk2-devel] [PATCH 32/37] OvmfPkg: remove 8254TimerDxe

["Laszlo Ersek" <lersek@redhat.com>]

8254TimerDxe is not used by any platforms at this point, remove it.

This patch removes mentions of the following CSM resources from the source
code:

- GUIDs (protocols or otherwise):
  - gEfiLegacy8259ProtocolGuid

- headers:
  - Protocol/Legacy8259.h

which extends the list of resources scheduled for removal to:

- GUIDs (protocols or otherwise):
  - gEfiLegacy8259ProtocolGuid

- headers:
  - Protocol/Legacy8259.h

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=4588
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
 OvmfPkg/8254TimerDxe/Timer.uni      |  16 -
 OvmfPkg/8254TimerDxe/TimerExtra.uni |  14 -
 OvmfPkg/8254TimerDxe/8254Timer.inf  |  43 ---
 OvmfPkg/8254TimerDxe/Timer.h        | 186 ---------
 OvmfPkg/8254TimerDxe/Timer.c        | 406 --------------------
 5 files changed, 665 deletions(-)

diff --git a/OvmfPkg/8254TimerDxe/Timer.uni b/OvmfPkg/8254TimerDxe/Timer.uni
deleted file mode 100644
index 7f3d35f4e1cd..000000000000
--- a/OvmfPkg/8254TimerDxe/Timer.uni
+++ /dev/null
@@ -1,16 +0,0 @@
-// /** @file
-// 8254 timer driver that provides Timer Arch protocol.
-//
-// 8254 timer driver that provides Timer Arch protocol.
-//
-// Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved.<BR>
-//
-// SPDX-License-Identifier: BSD-2-Clause-Patent
-//
-// **/
-
-
-#string STR_MODULE_ABSTRACT             #language en-US "8254 timer driver that provides Timer Arch protocol"
-
-#string STR_MODULE_DESCRIPTION          #language en-US "8254 timer driver that provides Timer Arch protocol."
-
diff --git a/OvmfPkg/8254TimerDxe/TimerExtra.uni b/OvmfPkg/8254TimerDxe/TimerExtra.uni
deleted file mode 100644
index 7a54767a451b..000000000000
--- a/OvmfPkg/8254TimerDxe/TimerExtra.uni
+++ /dev/null
@@ -1,14 +0,0 @@
-// /** @file
-// Timer Localized Strings and Content
-//
-// Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
-//
-// SPDX-License-Identifier: BSD-2-Clause-Patent
-//
-// **/
-
-#string STR_PROPERTIES_MODULE_NAME
-#language en-US
-"8254 Timer DXE Driver"
-
-
diff --git a/OvmfPkg/8254TimerDxe/8254Timer.inf b/OvmfPkg/8254TimerDxe/8254Timer.inf
deleted file mode 100644
index 8fbab896f01b..000000000000
--- a/OvmfPkg/8254TimerDxe/8254Timer.inf
+++ /dev/null
@@ -1,43 +0,0 @@
-## @file
-# 8254 timer driver that provides Timer Arch protocol.
-#
-# Copyright (c) 2005 - 2019, Intel Corporation. All rights reserved.<BR>
-# SPDX-License-Identifier: BSD-2-Clause-Patent
-#
-##
-
-[Defines]
-  INF_VERSION                    = 0x00010005
-  BASE_NAME                      = Timer
-  MODULE_UNI_FILE                = Timer.uni
-  FILE_GUID                      = C190FE35-44AA-41A1-8AEA-4947BC60E09D
-  MODULE_TYPE                    = DXE_DRIVER
-  VERSION_STRING                 = 1.0
-
-  ENTRY_POINT                    = TimerDriverInitialize
-
-[Packages]
-  MdePkg/MdePkg.dec
-  OvmfPkg/OvmfPkg.dec
-
-[LibraryClasses]
-  UefiBootServicesTableLib
-  BaseLib
-  DebugLib
-  NestedInterruptTplLib
-  UefiDriverEntryPoint
-  IoLib
-
-[Sources]
-  Timer.h
-  Timer.c
-
-[Protocols]
-  gEfiCpuArchProtocolGuid       ## CONSUMES
-  gEfiLegacy8259ProtocolGuid    ## CONSUMES
-  gEfiTimerArchProtocolGuid     ## PRODUCES
-
-[Depex]
-  gEfiCpuArchProtocolGuid AND gEfiLegacy8259ProtocolGuid
-[UserExtensions.TianoCore."ExtraFiles"]
-  TimerExtra.uni
diff --git a/OvmfPkg/8254TimerDxe/Timer.h b/OvmfPkg/8254TimerDxe/Timer.h
deleted file mode 100644
index b19ef3c1f94e..000000000000
--- a/OvmfPkg/8254TimerDxe/Timer.h
+++ /dev/null
@@ -1,186 +0,0 @@
-/** @file
-  Private data structures
-
-Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
-**/
-
-#ifndef _TIMER_H_
-#define _TIMER_H_
-
-#include <PiDxe.h>
-
-#include <Protocol/Cpu.h>
-#include <Protocol/Legacy8259.h>
-#include <Protocol/Timer.h>
-
-#include <Library/UefiBootServicesTableLib.h>
-#include <Library/BaseLib.h>
-#include <Library/DebugLib.h>
-#include <Library/IoLib.h>
-
-//
-// The PCAT 8253/8254 has an input clock at 1.193182 MHz and Timer 0 is
-// initialized as a 16 bit free running counter that generates an interrupt(IRQ0)
-// each time the counter rolls over.
-//
-//   65536 counts
-// ---------------- * 1,000,000 uS/S = 54925.4 uS = 549254 * 100 ns
-//   1,193,182 Hz
-//
-
-//
-// The maximum tick duration for 8254 timer
-//
-#define MAX_TIMER_TICK_DURATION  549254
-//
-// The default timer tick duration is set to 10 ms = 100000 100 ns units
-//
-#define DEFAULT_TIMER_TICK_DURATION  100000
-#define TIMER_CONTROL_PORT           0x43
-#define TIMER0_COUNT_PORT            0x40
-
-//
-// Function Prototypes
-//
-
-/**
-  Initialize the Timer Architectural Protocol driver
-
-  @param ImageHandle     ImageHandle of the loaded driver
-  @param SystemTable     Pointer to the System Table
-
-  @retval EFI_SUCCESS            Timer Architectural Protocol created
-  @retval EFI_OUT_OF_RESOURCES   Not enough resources available to initialize driver.
-  @retval EFI_DEVICE_ERROR       A device error occurred attempting to initialize the driver.
-
-**/
-EFI_STATUS
-EFIAPI
-TimerDriverInitialize (
-  IN EFI_HANDLE        ImageHandle,
-  IN EFI_SYSTEM_TABLE  *SystemTable
-  )
-;
-
-/**
-
-  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 NotifyFunction  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
-TimerDriverRegisterHandler (
-  IN EFI_TIMER_ARCH_PROTOCOL  *This,
-  IN EFI_TIMER_NOTIFY         NotifyFunction
-  )
-;
-
-/**
-
-  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
-  )
-;
-
-/**
-
-  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
-  )
-;
-
-/**
-
-  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
-  )
-;
-
-#endif
diff --git a/OvmfPkg/8254TimerDxe/Timer.c b/OvmfPkg/8254TimerDxe/Timer.c
deleted file mode 100644
index 5382b01615df..000000000000
--- a/OvmfPkg/8254TimerDxe/Timer.c
+++ /dev/null
@@ -1,406 +0,0 @@
-/** @file
-  Timer Architectural Protocol as defined in the DXE CIS
-
-Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved.<BR>
-SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#include <Library/NestedInterruptTplLib.h>
-
-#include "Timer.h"
-
-//
-// The handle onto which the Timer Architectural Protocol will be installed
-//
-EFI_HANDLE  mTimerHandle = NULL;
-
-//
-// The Timer Architectural Protocol that this driver produces
-//
-EFI_TIMER_ARCH_PROTOCOL  mTimer = {
-  TimerDriverRegisterHandler,
-  TimerDriverSetTimerPeriod,
-  TimerDriverGetTimerPeriod,
-  TimerDriverGenerateSoftInterrupt
-};
-
-//
-// Pointer to the CPU Architectural Protocol instance
-//
-EFI_CPU_ARCH_PROTOCOL  *mCpu;
-
-//
-// Pointer to the Legacy 8259 Protocol instance
-//
-EFI_LEGACY_8259_PROTOCOL  *mLegacy8259;
-
-//
-// The notification function to call on every timer interrupt.
-// A bug in the compiler prevents us from initializing this here.
-//
-EFI_TIMER_NOTIFY  mTimerNotifyFunction;
-
-//
-// The current period of the timer interrupt
-//
-volatile UINT64  mTimerPeriod = 0;
-
-//
-// Worker Functions
-//
-
-/**
-  Sets the counter value for Timer #0 in a legacy 8254 timer.
-
-  @param Count    The 16-bit counter value to program into Timer #0 of the legacy 8254 timer.
-**/
-VOID
-SetPitCount (
-  IN UINT16  Count
-  )
-{
-  IoWrite8 (TIMER_CONTROL_PORT, 0x36);
-  IoWrite8 (TIMER0_COUNT_PORT, (UINT8)(Count & 0xff));
-  IoWrite8 (TIMER0_COUNT_PORT, (UINT8)((Count >> 8) & 0xff));
-}
-
-/**
-  8254 Timer #0 Interrupt Handler.
-
-  @param InterruptType    The type of interrupt that occurred
-  @param SystemContext    A pointer to the system context when the interrupt occurred
-**/
-VOID
-EFIAPI
-TimerInterruptHandler (
-  IN EFI_EXCEPTION_TYPE  InterruptType,
-  IN EFI_SYSTEM_CONTEXT  SystemContext
-  )
-{
-  STATIC NESTED_INTERRUPT_STATE  NestedInterruptState;
-  EFI_TPL                        OriginalTPL;
-
-  OriginalTPL = NestedInterruptRaiseTPL ();
-
-  mLegacy8259->EndOfInterrupt (mLegacy8259, Efi8259Irq0);
-
-  if (mTimerNotifyFunction != NULL) {
-    //
-    // @bug : This does not handle missed timer interrupts
-    //
-    mTimerNotifyFunction (mTimerPeriod);
-  }
-
-  NestedInterruptRestoreTPL (OriginalTPL, SystemContext, &NestedInterruptState);
-}
-
-/**
-
-  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
-  )
-{
-  //
-  // Check for invalid parameters
-  //
-  if ((NotifyFunction == NULL) && (mTimerNotifyFunction == NULL)) {
-    return EFI_INVALID_PARAMETER;
-  }
-
-  if ((NotifyFunction != NULL) && (mTimerNotifyFunction != NULL)) {
-    return EFI_ALREADY_STARTED;
-  }
-
-  mTimerNotifyFunction = NotifyFunction;
-
-  return EFI_SUCCESS;
-}
-
-/**
-
-  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  TimerCount;
-
-  //
-  //  The basic clock is 1.19318 MHz or 0.119318 ticks per 100 ns.
-  //  TimerPeriod * 0.119318 = 8254 timer divisor. Using integer arithmetic
-  //  TimerCount = (TimerPeriod * 119318)/1000000.
-  //
-  //  Round up to next highest integer. This guarantees that the timer is
-  //  equal to or slightly longer than the requested time.
-  //  TimerCount = ((TimerPeriod * 119318) + 500000)/1000000
-  //
-  // Note that a TimerCount of 0 is equivalent to a count of 65,536
-  //
-  // Since TimerCount is limited to 16 bits for IA32, TimerPeriod is limited
-  // to 20 bits.
-  //
-  if (TimerPeriod == 0) {
-    //
-    // Disable timer interrupt for a TimerPeriod of 0
-    //
-    mLegacy8259->DisableIrq (mLegacy8259, Efi8259Irq0);
-  } else {
-    //
-    // Convert TimerPeriod into 8254 counts
-    //
-    TimerCount = DivU64x32 (MultU64x32 (119318, (UINT32)TimerPeriod) + 500000, 1000000);
-
-    //
-    // Check for overflow
-    //
-    if (TimerCount >= 65536) {
-      TimerCount  = 0;
-      TimerPeriod = MAX_TIMER_TICK_DURATION;
-    }
-
-    //
-    // Program the 8254 timer with the new count value
-    //
-    SetPitCount ((UINT16)TimerCount);
-
-    //
-    // Enable timer interrupt
-    //
-    mLegacy8259->EnableIrq (mLegacy8259, Efi8259Irq0, FALSE);
-  }
-
-  //
-  // 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
-  )
-{
-  EFI_STATUS  Status;
-  UINT16      IRQMask;
-  EFI_TPL     OriginalTPL;
-
-  //
-  // If the timer interrupt is enabled, then the registered handler will be invoked.
-  //
-  Status = mLegacy8259->GetMask (mLegacy8259, NULL, NULL, &IRQMask, NULL);
-  ASSERT_EFI_ERROR (Status);
-  if ((IRQMask & 0x1) == 0) {
-    //
-    // Invoke the registered handler
-    //
-    OriginalTPL = gBS->RaiseTPL (TPL_HIGH_LEVEL);
-
-    if (mTimerNotifyFunction != NULL) {
-      //
-      // @bug : This does not handle missed timer interrupts
-      //
-      mTimerNotifyFunction (mTimerPeriod);
-    }
-
-    gBS->RestoreTPL (OriginalTPL);
-  } else {
-    return EFI_UNSUPPORTED;
-  }
-
-  return EFI_SUCCESS;
-}
-
-/**
-  Initialize the Timer Architectural Protocol driver
-
-  @param ImageHandle     ImageHandle of the loaded driver
-  @param SystemTable     Pointer to the System Table
-
-  @retval EFI_SUCCESS            Timer Architectural Protocol created
-  @retval EFI_OUT_OF_RESOURCES   Not enough resources available to initialize driver.
-  @retval EFI_DEVICE_ERROR       A device error occurred attempting to initialize the driver.
-
-**/
-EFI_STATUS
-EFIAPI
-TimerDriverInitialize (
-  IN EFI_HANDLE        ImageHandle,
-  IN EFI_SYSTEM_TABLE  *SystemTable
-  )
-{
-  EFI_STATUS  Status;
-  UINT32      TimerVector;
-
-  //
-  // Initialize the pointer to our notify function.
-  //
-  mTimerNotifyFunction = NULL;
-
-  //
-  // Make sure the Timer Architectural Protocol is not already installed in the system
-  //
-  ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiTimerArchProtocolGuid);
-
-  //
-  // Find the CPU architectural protocol.
-  //
-  Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&mCpu);
-  ASSERT_EFI_ERROR (Status);
-
-  //
-  // Find the Legacy8259 protocol.
-  //
-  Status = gBS->LocateProtocol (&gEfiLegacy8259ProtocolGuid, NULL, (VOID **)&mLegacy8259);
-  ASSERT_EFI_ERROR (Status);
-
-  //
-  // Force the timer to be disabled
-  //
-  Status = TimerDriverSetTimerPeriod (&mTimer, 0);
-  ASSERT_EFI_ERROR (Status);
-
-  //
-  // Get the interrupt vector number corresponding to IRQ0 from the 8259 driver
-  //
-  TimerVector = 0;
-  Status      = mLegacy8259->GetVector (mLegacy8259, Efi8259Irq0, (UINT8 *)&TimerVector);
-  ASSERT_EFI_ERROR (Status);
-
-  //
-  // Install interrupt handler for 8254 Timer #0 (ISA IRQ0)
-  //
-  Status = mCpu->RegisterInterruptHandler (mCpu, TimerVector, TimerInterruptHandler);
-  ASSERT_EFI_ERROR (Status);
-
-  //
-  // Force the timer to be enabled at its default period
-  //
-  Status = TimerDriverSetTimerPeriod (&mTimer, DEFAULT_TIMER_TICK_DURATION);
-  ASSERT_EFI_ERROR (Status);
-
-  //
-  // Install the Timer Architectural Protocol onto a new handle
-  //
-  Status = gBS->InstallMultipleProtocolInterfaces (
-                  &mTimerHandle,
-                  &gEfiTimerArchProtocolGuid,
-                  &mTimer,
-                  NULL
-                  );
-  ASSERT_EFI_ERROR (Status);
-
-  return Status;
-}



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