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1 | /** @file\r |
2 | MicroSecondDelay implementation of ACPI Timer.\r | |
3 | \r | |
4 | Copyright (c) 2007 - 2015, Intel Corporation. All rights reserved.<BR>\r | |
5 | \r | |
6 | This program and the accompanying materials are licensed and made available under\r | |
7 | the terms and conditions of the BSD License that accompanies this distribution. \r | |
8 | The full text of the license may be found at \r | |
9 | http://opensource.org/licenses/bsd-license.php. \r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
13 | \r | |
14 | --*/\r | |
15 | \r | |
16 | #include "PiPei.h"\r | |
17 | #include "I2CAccess.h"\r | |
18 | #include "I2CDelayPei.h"\r | |
19 | #include <Library/DebugLib.h>\r | |
20 | #include <Library/PeiServicesTablePointerLib.h>\r | |
21 | #include <Ppi/Stall.h>\r | |
22 | \r | |
23 | /**\r | |
24 | Stalls the CPU for at least the given number of microseconds.\r | |
25 | Stalls the CPU for the number of microseconds specified by MicroSeconds.\r | |
26 | \r | |
27 | @param MicroSeconds The minimum number of microseconds to delay.\r | |
28 | \r | |
29 | @return EFI_STATUS\r | |
30 | \r | |
31 | **/\r | |
32 | EFI_STATUS\r | |
33 | EFIAPI\r | |
34 | MicroSecondDelay (\r | |
35 | IN UINTN MicroSeconds\r | |
36 | )\r | |
37 | {\r | |
38 | \r | |
39 | EFI_PEI_STALL_PPI *StallPpi;\r | |
40 | EFI_STATUS Status;\r | |
41 | CONST EFI_PEI_SERVICES **PeiServices;\r | |
42 | \r | |
43 | PeiServices = GetPeiServicesTablePointer();\r | |
44 | \r | |
45 | \r | |
46 | Status = (**PeiServices).LocatePpi (PeiServices, &gEfiPeiStallPpiGuid, 0, NULL, &StallPpi);\r | |
47 | ASSERT(!EFI_ERROR(Status));\r | |
48 | \r | |
49 | StallPpi->Stall (PeiServices, StallPpi, MicroSeconds);\r | |
50 | \r | |
51 | return EFI_SUCCESS;\r | |
52 | }\r |