mirror of https://github.com/acidanthera/audk.git
353 lines
10 KiB
C
353 lines
10 KiB
C
/*++ @file
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Emu Emulation Timer Architectural Protocol Driver as defined in DXE CIS
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This Timer module uses an Emu Thread to simulate the timer-tick driven
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timer service. In the future, the Thread creation should possibly be
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abstracted by the CPU architectural protocol
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Copyright (c) 2004 - 2016, Intel Corporation. All rights reserved.<BR>
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Portions copyright (c) 2010 - 2011, Apple Inc. All rights reserved.
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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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**/
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#include "PiDxe.h"
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#include <Protocol/Timer.h>
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#include <Protocol/Cpu.h>
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#include "Timer.h"
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiLib.h>
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#include <Library/UefiDriverEntryPoint.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/EmuThunkLib.h>
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//
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// Pointer to the CPU Architectural Protocol instance
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//
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EFI_CPU_ARCH_PROTOCOL *mCpu;
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//
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// The Timer Architectural Protocol that this driver produces
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//
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EFI_TIMER_ARCH_PROTOCOL mTimer = {
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EmuTimerDriverRegisterHandler,
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EmuTimerDriverSetTimerPeriod,
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EmuTimerDriverGetTimerPeriod,
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EmuTimerDriverGenerateSoftInterrupt
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};
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//
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// The notification function to call on every timer interrupt
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//
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EFI_TIMER_NOTIFY mTimerNotifyFunction = NULL;
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//
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// The current period of the timer interrupt
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//
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UINT64 mTimerPeriodMs;
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VOID
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EFIAPI
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TimerCallback (UINT64 DeltaMs)
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{
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EFI_TPL OriginalTPL;
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EFI_TIMER_NOTIFY CallbackFunction;
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OriginalTPL = gBS->RaiseTPL (TPL_HIGH_LEVEL);
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if (OriginalTPL < TPL_HIGH_LEVEL) {
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CallbackFunction = mTimerNotifyFunction;
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//
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// Only invoke the callback function if a Non-NULL handler has been
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// registered. Assume all other handlers are legal.
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//
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if (CallbackFunction != NULL) {
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CallbackFunction (MultU64x32 (DeltaMs, 10000));
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}
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}
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gBS->RestoreTPL (OriginalTPL);
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}
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EFI_STATUS
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EFIAPI
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EmuTimerDriverRegisterHandler (
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IN EFI_TIMER_ARCH_PROTOCOL *This,
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IN EFI_TIMER_NOTIFY NotifyFunction
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)
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/*++
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Routine Description:
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This function registers the handler NotifyFunction so it is called every time
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the timer interrupt fires. It also passes the amount of time since the last
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handler call to the NotifyFunction. If NotifyFunction is NULL, then the
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handler is unregistered. If the handler is registered, then EFI_SUCCESS is
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returned. If the CPU does not support registering a timer interrupt handler,
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then EFI_UNSUPPORTED is returned. If an attempt is made to register a handler
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when a handler is already registered, then EFI_ALREADY_STARTED is returned.
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If an attempt is made to unregister a handler when a handler is not registered,
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then EFI_INVALID_PARAMETER is returned. If an error occurs attempting to
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register the NotifyFunction with the timer interrupt, then EFI_DEVICE_ERROR
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is returned.
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Arguments:
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This - The EFI_TIMER_ARCH_PROTOCOL instance.
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NotifyFunction - The function to call when a timer interrupt fires. This
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function executes at TPL_HIGH_LEVEL. The DXE Core will
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register a handler for the timer interrupt, so it can know
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how much time has passed. This information is used to
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signal timer based events. NULL will unregister the handler.
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Returns:
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EFI_SUCCESS - The timer handler was registered.
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EFI_UNSUPPORTED - The platform does not support timer interrupts.
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EFI_ALREADY_STARTED - NotifyFunction is not NULL, and a handler is already
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registered.
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EFI_INVALID_PARAMETER - NotifyFunction is NULL, and a handler was not
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previously registered.
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EFI_DEVICE_ERROR - The timer handler could not be registered.
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**/
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{
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//
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// Check for invalid parameters
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//
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if (NotifyFunction == NULL && mTimerNotifyFunction == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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if (NotifyFunction != NULL && mTimerNotifyFunction != NULL) {
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return EFI_ALREADY_STARTED;
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}
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if (NotifyFunction == NULL) {
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/* Disable timer. */
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gEmuThunk->SetTimer (0, TimerCallback);
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} else if (mTimerNotifyFunction == NULL) {
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/* Enable Timer. */
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gEmuThunk->SetTimer (mTimerPeriodMs, TimerCallback);
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}
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mTimerNotifyFunction = NotifyFunction;
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return EFI_SUCCESS;
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}
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EFI_STATUS
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EFIAPI
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EmuTimerDriverSetTimerPeriod (
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IN EFI_TIMER_ARCH_PROTOCOL *This,
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IN UINT64 TimerPeriod
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)
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/*++
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Routine Description:
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This function adjusts the period of timer interrupts to the value specified
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by TimerPeriod. If the timer period is updated, then the selected timer
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period is stored in EFI_TIMER.TimerPeriod, and EFI_SUCCESS is returned. If
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the timer hardware is not programmable, then EFI_UNSUPPORTED is returned.
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If an error occurs while attempting to update the timer period, then the
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timer hardware will be put back in its state prior to this call, and
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EFI_DEVICE_ERROR is returned. If TimerPeriod is 0, then the timer interrupt
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is disabled. This is not the same as disabling the CPU's interrupts.
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Instead, it must either turn off the timer hardware, or it must adjust the
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interrupt controller so that a CPU interrupt is not generated when the timer
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interrupt fires.
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Arguments:
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This - The EFI_TIMER_ARCH_PROTOCOL instance.
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TimerPeriod - The rate to program the timer interrupt in 100 nS units. If
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the timer hardware is not programmable, then EFI_UNSUPPORTED is
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returned. If the timer is programmable, then the timer period
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will be rounded up to the nearest timer period that is supported
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by the timer hardware. If TimerPeriod is set to 0, then the
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timer interrupts will be disabled.
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Returns:
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EFI_SUCCESS - The timer period was changed.
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EFI_UNSUPPORTED - The platform cannot change the period of the timer interrupt.
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EFI_DEVICE_ERROR - The timer period could not be changed due to a device error.
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**/
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{
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//
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// If TimerPeriod is 0, then the timer thread should be canceled
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// If the TimerPeriod is valid, then create and/or adjust the period of the timer thread
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//
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if (TimerPeriod == 0
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|| ((TimerPeriod > TIMER_MINIMUM_VALUE)
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&& (TimerPeriod < TIMER_MAXIMUM_VALUE))) {
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mTimerPeriodMs = DivU64x32 (TimerPeriod + 5000, 10000);
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gEmuThunk->SetTimer (mTimerPeriodMs, TimerCallback);
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}
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return EFI_SUCCESS;
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}
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EFI_STATUS
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EFIAPI
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EmuTimerDriverGetTimerPeriod (
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IN EFI_TIMER_ARCH_PROTOCOL *This,
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OUT UINT64 *TimerPeriod
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)
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/*++
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Routine Description:
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This function retrieves the period of timer interrupts in 100 ns units,
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returns that value in TimerPeriod, and returns EFI_SUCCESS. If TimerPeriod
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is NULL, then EFI_INVALID_PARAMETER is returned. If a TimerPeriod of 0 is
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returned, then the timer is currently disabled.
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Arguments:
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This - The EFI_TIMER_ARCH_PROTOCOL instance.
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TimerPeriod - A pointer to the timer period to retrieve in 100 ns units. If
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0 is returned, then the timer is currently disabled.
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Returns:
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EFI_SUCCESS - The timer period was returned in TimerPeriod.
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EFI_INVALID_PARAMETER - TimerPeriod is NULL.
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**/
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{
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if (TimerPeriod == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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*TimerPeriod = MultU64x32 (mTimerPeriodMs, 10000);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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EFIAPI
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EmuTimerDriverGenerateSoftInterrupt (
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IN EFI_TIMER_ARCH_PROTOCOL *This
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)
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/*++
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Routine Description:
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This function generates a soft timer interrupt. If the platform does not support soft
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timer interrupts, then EFI_UNSUPPORTED is returned. Otherwise, EFI_SUCCESS is returned.
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If a handler has been registered through the EFI_TIMER_ARCH_PROTOCOL.RegisterHandler()
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service, then a soft timer interrupt will be generated. If the timer interrupt is
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enabled when this service is called, then the registered handler will be invoked. The
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registered handler should not be able to distinguish a hardware-generated timer
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interrupt from a software-generated timer interrupt.
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Arguments:
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This - The EFI_TIMER_ARCH_PROTOCOL instance.
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Returns:
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EFI_SUCCESS - The soft timer interrupt was generated.
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EFI_UNSUPPORTED - The platform does not support the generation of soft timer interrupts.
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**/
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{
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return EFI_UNSUPPORTED;
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}
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EFI_STATUS
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EFIAPI
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EmuTimerDriverInitialize (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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/*++
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Routine Description:
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Initialize the Timer Architectural Protocol driver
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Arguments:
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ImageHandle - ImageHandle of the loaded driver
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SystemTable - Pointer to the System Table
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Returns:
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EFI_SUCCESS - Timer Architectural Protocol created
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EFI_OUT_OF_RESOURCES - Not enough resources available to initialize driver.
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EFI_DEVICE_ERROR - A device error occured attempting to initialize the driver.
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**/
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{
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EFI_STATUS Status;
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EFI_HANDLE Handle;
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//
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// Make sure the Timer Architectural Protocol is not already installed in the system
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//
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ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiTimerArchProtocolGuid);
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//
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// Get the CPU Architectural Protocol instance
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//
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Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (void *)&mCpu);
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ASSERT_EFI_ERROR (Status);
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//
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// Start the timer thread at the default timer period
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//
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Status = mTimer.SetTimerPeriod (&mTimer, DEFAULT_TIMER_TICK_DURATION);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Install the Timer Architectural Protocol onto a new handle
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//
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Handle = NULL;
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Status = gBS->InstallProtocolInterface (
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&Handle,
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&gEfiTimerArchProtocolGuid,
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EFI_NATIVE_INTERFACE,
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&mTimer
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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return EFI_SUCCESS;
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}
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