1 /** @file 2 This file declares Stall PPI. 3 4 This ppi abstracts the blocking stall service to other agents. 5 6 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 7 This program and the accompanying materials 8 are licensed and made available under the terms and conditions of the BSD License 9 which accompanies this distribution. The full text of the license may be found at 10 http://opensource.org/licenses/bsd-license.php 11 12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 14 15 @par Revision Reference: 16 This PPI is introduced in PI Version 1.0. 17 18 **/ 19 20 #ifndef __STALL_PPI_H__ 21 #define __STALL_PPI_H__ 22 23 #define EFI_PEI_STALL_PPI_GUID \ 24 { 0x1f4c6f90, 0xb06b, 0x48d8, {0xa2, 0x01, 0xba, 0xe5, 0xf1, 0xcd, 0x7d, 0x56 } } 25 26 typedef struct _EFI_PEI_STALL_PPI EFI_PEI_STALL_PPI; 27 28 /** 29 The Stall() function provides a blocking stall for at least the number 30 of microseconds stipulated in the final argument of the API. 31 32 @param PeiServices An indirect pointer to the PEI Services Table 33 published by the PEI Foundation. 34 @param This Pointer to the local data for the interface. 35 @param Microseconds Number of microseconds for which to stall. 36 37 @retval EFI_SUCCESS The service provided at least the required delay. 38 39 **/ 40 typedef 41 EFI_STATUS 42 (EFIAPI *EFI_PEI_STALL)( 43 IN CONST EFI_PEI_SERVICES **PeiServices, 44 IN CONST EFI_PEI_STALL_PPI *This, 45 IN UINTN Microseconds 46 ); 47 48 /// 49 /// This service provides a simple, blocking stall with platform-specific resolution. 50 /// 51 struct _EFI_PEI_STALL_PPI { 52 /// 53 /// The resolution in microseconds of the stall services. 54 /// 55 UINTN Resolution; 56 57 EFI_PEI_STALL Stall; 58 }; 59 60 extern EFI_GUID gEfiPeiStallPpiGuid; 61 62 #endif 63
