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Diffstat (limited to 'src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Timer.h')
| -rw-r--r-- | src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Timer.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Timer.h b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Timer.h new file mode 100644 index 0000000000..29d65215b1 --- /dev/null +++ b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/Timer.h @@ -0,0 +1,180 @@ +/** @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 - 2016, Intel Corporation. All rights reserved.<BR> + 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 function + 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_UNSUPPORTED 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 + ); + + +/// +/// 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. +/// +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 |