mirror of https://github.com/acidanthera/audk.git
207 lines
9.1 KiB
C
207 lines
9.1 KiB
C
/** @file
|
|
Timer Architectural Protocol as defined in PI Specification VOLUME 2 DXE
|
|
|
|
This code is used to provide the timer tick for the DXE core.
|
|
|
|
Copyright (c) 2006 - 2008, 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.
|
|
|
|
**/
|
|
|
|
#ifndef __ARCH_PROTOCOL_TIMER_H__
|
|
#define __ARCH_PROTOCOL_TIMER_H__
|
|
|
|
///
|
|
/// Global ID for the Timer Architectural Protocol
|
|
///
|
|
#define EFI_TIMER_ARCH_PROTOCOL_GUID \
|
|
{ 0x26baccb3, 0x6f42, 0x11d4, {0xbc, 0xe7, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 } }
|
|
|
|
///
|
|
/// Declare forward reference for the Timer Architectural Protocol
|
|
///
|
|
typedef struct _EFI_TIMER_ARCH_PROTOCOL EFI_TIMER_ARCH_PROTOCOL;
|
|
|
|
/**
|
|
This function of this type is called when a timer interrupt fires. This
|
|
function executes at TPL_HIGH_LEVEL. The DXE Core will register a funtion
|
|
of this type to be called for the timer interrupt, so it can know how much
|
|
time has passed. This information is used to signal timer based events.
|
|
|
|
@param Time Time since the last timer interrupt in 100 ns units. This will
|
|
typically be TimerPeriod, but if a timer interrupt is missed, and the
|
|
EFI_TIMER_ARCH_PROTOCOL driver can detect missed interrupts, then Time
|
|
will contain the actual amount of time since the last interrupt.
|
|
|
|
None.
|
|
|
|
**/
|
|
typedef
|
|
VOID
|
|
(EFIAPI *EFI_TIMER_NOTIFY)(
|
|
IN UINT64 Time
|
|
);
|
|
|
|
/**
|
|
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.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_TIMER_REGISTER_HANDLER)(
|
|
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.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_TIMER_SET_TIMER_PERIOD)(
|
|
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.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_TIMER_GET_TIMER_PERIOD)(
|
|
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_UNSUPPORTEDT The platform does not support the generation of soft timer interrupts.
|
|
|
|
**/
|
|
typedef
|
|
EFI_STATUS
|
|
(EFIAPI *EFI_TIMER_GENERATE_SOFT_INTERRUPT)(
|
|
IN EFI_TIMER_ARCH_PROTOCOL *This
|
|
);
|
|
|
|
|
|
/**
|
|
Interface stucture 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.
|
|
|
|
**/
|
|
struct _EFI_TIMER_ARCH_PROTOCOL {
|
|
EFI_TIMER_REGISTER_HANDLER RegisterHandler;
|
|
EFI_TIMER_SET_TIMER_PERIOD SetTimerPeriod;
|
|
EFI_TIMER_GET_TIMER_PERIOD GetTimerPeriod;
|
|
EFI_TIMER_GENERATE_SOFT_INTERRUPT GenerateSoftInterrupt;
|
|
};
|
|
|
|
extern EFI_GUID gEfiTimerArchProtocolGuid;
|
|
|
|
#endif
|