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Diffstat (limited to 'MdePkg/Include/Protocol/Timer.h')
| -rw-r--r-- | MdePkg/Include/Protocol/Timer.h | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/MdePkg/Include/Protocol/Timer.h b/MdePkg/Include/Protocol/Timer.h new file mode 100644 index 0000000000..302ae1428a --- /dev/null +++ b/MdePkg/Include/Protocol/Timer.h @@ -0,0 +1,211 @@ +/** @file
+ Timer Architectural Protocol as defined in the DXE CIS
+
+ This code is used to provide the timer tick for the DXE core.
+
+ Copyright (c) 2006, 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.
+
+ Module Name: Timer.h
+
+ @par Revision Reference:
+ Version 0.91B.
+
+**/
+
+#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 tyis 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
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