/** @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 |