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/** @file
Private data structures
@copyright
Copyright (c) 1999 - 2012 Intel Corporation. All rights reserved
This software and associated documentation (if any) is furnished
under a license and may only be used or copied in accordance
with the terms of the license. Except as permitted by such
license, no part of this software or documentation may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means without the express written consent of
Intel Corporation.
This file contains an 'Intel Peripheral Driver' and uniquely
identified as "Intel Reference Module" and is
licensed for Intel CPUs and chipsets under the terms of your
license agreement with Intel or your vendor. This file may
be modified by the user, subject to additional terms of the
license agreement
**/
#ifndef _SMARTTIMER_H_
#define _SMARTTIMER_H_
//
// External include files do NOT need to be explicitly specified in real EDKII
// environment
//
#if !defined(EDK_RELEASE_VERSION) || (EDK_RELEASE_VERSION < 0x00020000)
#include "EdkIIGlueDxe.h"
#include "PchAccess.h"
//
// Consumed Protocols
//
#include EFI_ARCH_PROTOCOL_CONSUMER (Cpu)
#include EFI_PROTOCOL_CONSUMER (Legacy8259)
//
// Produced Protocols
//
#include EFI_ARCH_PROTOCOL_PRODUCER (Timer)
#endif
///
/// 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
///
#define DEFAULT_TIMER_TICK_DURATION 549254
#define TIMER_CONTROL_PORT 0x43
#define TIMER0_COUNT_PORT 0x40
//
// Function Prototypes
//
/**
Initialize the Timer Architectural Protocol driver
@param[in] ImageHandle ImageHandle of the loaded driver
@param[in] SystemTable Pointer to the System Table
@retval EFI_SUCCESS Timer Architectural Protocol created
@retval Other Failed
**/
EFI_STATUS
EFIAPI
TimerDriverInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
;
/**
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[in] This The EFI_TIMER_ARCH_PROTOCOL instance.
@param[in] 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.
@exception EFI_UNSUPPORTED The CPU does not support registering a timer interrupt handler
@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.
**/
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[in] This The EFI_TIMER_ARCH_PROTOCOL instance.
@param[in] 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.
**/
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[in] This The EFI_TIMER_ARCH_PROTOCOL instance.
@param[out] 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[in] This The EFI_TIMER_ARCH_PROTOCOL instance.
@retval EFI_SUCCESS The soft timer interrupt was generated.
**/
EFI_STATUS
EFIAPI
TimerDriverGenerateSoftInterrupt (
IN EFI_TIMER_ARCH_PROTOCOL *This
);
#endif
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