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