mirror of https://github.com/acidanthera/audk.git
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/** @file
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MicroSecondDelay implementation of ACPI Timer.
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Copyright (c) 2007 - 2015, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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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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--*/
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#include "PiPei.h"
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#include "I2CAccess.h"
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#include "I2CDelayPei.h"
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#include <Library/DebugLib.h>
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#include <Library/PeiServicesTablePointerLib.h>
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#include <Ppi/Stall.h>
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/**
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Stalls the CPU for at least the given number of microseconds.
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Stalls the CPU for the number of microseconds specified by MicroSeconds.
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@param MicroSeconds The minimum number of microseconds to delay.
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@return EFI_STATUS
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**/
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EFI_STATUS
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EFIAPI
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MicroSecondDelay (
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IN UINTN MicroSeconds
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)
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{
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EFI_PEI_STALL_PPI *StallPpi;
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EFI_STATUS Status;
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CONST EFI_PEI_SERVICES **PeiServices;
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PeiServices = GetPeiServicesTablePointer();
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Status = (**PeiServices).LocatePpi (PeiServices, &gEfiPeiStallPpiGuid, 0, NULL, &StallPpi);
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ASSERT(!EFI_ERROR(Status));
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StallPpi->Stall (PeiServices, StallPpi, MicroSeconds);
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return EFI_SUCCESS;
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}
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