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57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
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/** @file
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This file declares Stall PPI.
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This ppi abstracts the blocking stall service to other agents.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This PPI is introduced in PI Version 1.0.
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**/
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#ifndef __STALL_PPI_H__
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#define __STALL_PPI_H__
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#define EFI_PEI_STALL_PPI_GUID \
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{ 0x1f4c6f90, 0xb06b, 0x48d8, {0xa2, 0x01, 0xba, 0xe5, 0xf1, 0xcd, 0x7d, 0x56 } }
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typedef struct _EFI_PEI_STALL_PPI EFI_PEI_STALL_PPI;
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/**
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The Stall() function provides a blocking stall for at least the number
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of microseconds stipulated in the final argument of the API.
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@param PeiServices An indirect pointer to the PEI Services Table
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published by the PEI Foundation.
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@param This Pointer to the local data for the interface.
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@param Microseconds Number of microseconds for which to stall.
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@retval EFI_SUCCESS The service provided at least the required delay.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PEI_STALL)(
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IN CONST EFI_PEI_SERVICES **PeiServices,
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IN CONST EFI_PEI_STALL_PPI *This,
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IN UINTN Microseconds
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);
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///
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/// This service provides a simple, blocking stall with platform-specific resolution.
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///
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struct _EFI_PEI_STALL_PPI {
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///
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/// The resolution in microseconds of the stall services.
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///
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UINTN Resolution;
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EFI_PEI_STALL Stall;
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};
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extern EFI_GUID gEfiPeiStallPpiGuid;
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#endif
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