mirror of https://github.com/acidanthera/audk.git
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
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/*++
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Copyright (c) 2006, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name:
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Metronome.c
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Abstract:
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NT Emulation Metronome Architectural Protocol Driver as defined in DXE CIS
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--*/
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#include "Metronome.h"
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//
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// Global Variables
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//
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EFI_METRONOME_ARCH_PROTOCOL mMetronome = {
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WinNtMetronomeDriverWaitForTick,
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TICK_PERIOD
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};
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//
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// Worker Functions
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//
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EFI_STATUS
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EFIAPI
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WinNtMetronomeDriverWaitForTick (
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IN EFI_METRONOME_ARCH_PROTOCOL *This,
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IN UINT32 TickNumber
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)
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/*++
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Routine Description:
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The WaitForTick() function waits for the number of ticks specified by
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TickNumber from a known time source in the platform. If TickNumber of
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ticks are detected, then EFI_SUCCESS is returned. The actual time passed
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between entry of this function and the first tick is between 0 and
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TickPeriod 100 nS units. If you want to guarantee that at least TickPeriod
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time has elapsed, wait for two ticks. This function waits for a hardware
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event to determine when a tick occurs. It is possible for interrupt
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processing, or exception processing to interrupt the execution of the
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WaitForTick() function. Depending on the hardware source for the ticks, it
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is possible for a tick to be missed. This function cannot guarantee that
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ticks will not be missed. If a timeout occurs waiting for the specified
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number of ticks, then EFI_TIMEOUT is returned.
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Arguments:
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This - The EFI_METRONOME_ARCH_PROTOCOL instance.
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TickNumber - Number of ticks to wait.
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Returns:
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EFI_SUCCESS - The wait for the number of ticks specified by TickNumber
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succeeded.
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--*/
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{
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UINT64 SleepTime;
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//
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// Calculate the time to sleep. Win API smallest unit to sleep is 1 millisec
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// Tick Period is in 100ns units, divide by 10000 to convert to ms
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//
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SleepTime = DivU64x32 (MultU64x32 ((UINT64) TickNumber, TICK_PERIOD) + 9999, 10000);
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gWinNt->Sleep ((UINT32) SleepTime);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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EFIAPI
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WinNtMetronomeDriverInitialize (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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/*++
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Routine Description:
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Initialize the Metronome Architectural Protocol driver
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Arguments:
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ImageHandle - ImageHandle of the loaded driver
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SystemTable - Pointer to the System Table
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Returns:
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EFI_SUCCESS - Metronome Architectural Protocol created
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EFI_OUT_OF_RESOURCES - Not enough resources available to initialize driver.
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EFI_DEVICE_ERROR - A device error occured attempting to initialize the driver.
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--*/
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{
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EFI_STATUS Status;
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EFI_HANDLE Handle;
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//
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// Install the Metronome Architectural Protocol onto a new handle
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//
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Handle = NULL;
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Status = gBS->InstallProtocolInterface (
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&Handle,
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&gEfiMetronomeArchProtocolGuid,
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EFI_NATIVE_INTERFACE,
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&mMetronome
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);
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return Status;
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}
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