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175 lines
7.5 KiB
C
175 lines
7.5 KiB
C
/** @file
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Timer Architectural Protocol as defined in PI Specification VOLUME 2 DXE
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This code is used to provide the timer tick for the DXE core.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef __ARCH_PROTOCOL_TIMER_H__
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#define __ARCH_PROTOCOL_TIMER_H__
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///
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/// Global ID for the Timer Architectural Protocol
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///
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#define EFI_TIMER_ARCH_PROTOCOL_GUID \
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{ 0x26baccb3, 0x6f42, 0x11d4, {0xbc, 0xe7, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 } }
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///
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/// Declare forward reference for the Timer Architectural Protocol
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///
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typedef struct _EFI_TIMER_ARCH_PROTOCOL EFI_TIMER_ARCH_PROTOCOL;
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/**
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This function of this type is called when a timer interrupt fires. This
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function executes at TPL_HIGH_LEVEL. The DXE Core will register a function
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of this type to be called for the timer interrupt, so it can know how much
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time has passed. This information is used to signal timer based events.
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@param Time Time since the last timer interrupt in 100 ns units. This will
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typically be TimerPeriod, but if a timer interrupt is missed, and the
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EFI_TIMER_ARCH_PROTOCOL driver can detect missed interrupts, then Time
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will contain the actual amount of time since the last interrupt.
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None.
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**/
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typedef
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VOID
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(EFIAPI *EFI_TIMER_NOTIFY)(
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IN UINT64 Time
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);
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/**
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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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@param This The EFI_TIMER_ARCH_PROTOCOL instance.
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@param 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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@retval EFI_SUCCESS The timer handler was registered.
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@retval EFI_UNSUPPORTED The platform does not support timer interrupts.
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@retval EFI_ALREADY_STARTED NotifyFunction is not NULL, and a handler is already
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registered.
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@retval EFI_INVALID_PARAMETER NotifyFunction is NULL, and a handler was not
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previously registered.
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@retval EFI_DEVICE_ERROR The timer handler could not be registered.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_TIMER_REGISTER_HANDLER)(
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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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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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@param This The EFI_TIMER_ARCH_PROTOCOL instance.
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@param 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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@retval EFI_SUCCESS The timer period was changed.
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@retval EFI_UNSUPPORTED The platform cannot change the period of the timer interrupt.
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@retval EFI_DEVICE_ERROR The timer period could not be changed due to a device error.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_TIMER_SET_TIMER_PERIOD)(
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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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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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@param This The EFI_TIMER_ARCH_PROTOCOL instance.
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@param 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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@retval EFI_SUCCESS The timer period was returned in TimerPeriod.
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@retval EFI_INVALID_PARAMETER TimerPeriod is NULL.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_TIMER_GET_TIMER_PERIOD)(
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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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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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@param This The EFI_TIMER_ARCH_PROTOCOL instance.
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@retval EFI_SUCCESS The soft timer interrupt was generated.
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@retval EFI_UNSUPPORTED The platform does not support the generation of soft timer interrupts.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_TIMER_GENERATE_SOFT_INTERRUPT)(
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IN EFI_TIMER_ARCH_PROTOCOL *This
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);
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///
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/// This protocol provides the services to initialize a periodic timer
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/// interrupt, and to register a handler that is called each time the timer
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/// interrupt fires. It may also provide a service to adjust the rate of the
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/// periodic timer interrupt. When a timer interrupt occurs, the handler is
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/// passed the amount of time that has passed since the previous timer
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/// interrupt.
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///
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struct _EFI_TIMER_ARCH_PROTOCOL {
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EFI_TIMER_REGISTER_HANDLER RegisterHandler;
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EFI_TIMER_SET_TIMER_PERIOD SetTimerPeriod;
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EFI_TIMER_GET_TIMER_PERIOD GetTimerPeriod;
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EFI_TIMER_GENERATE_SOFT_INTERRUPT GenerateSoftInterrupt;
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};
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extern EFI_GUID gEfiTimerArchProtocolGuid;
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#endif
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