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bf231ea6 | 1 | /** @file\r |
030cd1a2 | 2 | PEI Services Table Pointer Library for IA-32 and x64.\r |
bf231ea6 | 3 | \r |
ce02b0b9 | 4 | According to PI specification, the peiservice pointer is stored prior at IDT\r |
5 | table in IA32 and x64 architecture.\r | |
6 | \r | |
bf231ea6 A |
7 | Copyright (c) 2006 - 2007, Intel Corporation.<BR>\r |
8 | All rights reserved. This program and the accompanying materials \r | |
9 | are licensed and made available under the terms and conditions of the BSD License \r | |
10 | which accompanies this distribution. The full text of the license may be found at \r | |
11 | http://opensource.org/licenses/bsd-license.php \r | |
12 | \r | |
13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
14 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
15 | \r | |
16 | **/\r | |
c7d265a9 | 17 | \r |
5dd39dc6 | 18 | #include <PiPei.h>\r |
19 | \r | |
20 | #include <Library/BaseLib.h>\r | |
21 | #include <Library/PeiServicesTablePointerLib.h>\r | |
22 | #include <Library/DebugLib.h>\r | |
c7d265a9 | 23 | \r |
24 | /**\r | |
f38fdc74 | 25 | The function returns the pointer to PEI services.\r |
26 | \r | |
27 | The function returns the pointer to PEI services.\r | |
28 | It will ASSERT() if the pointer to PEI services is NULL.\r | |
29 | \r | |
30 | @retval The pointer to PeiServices.\r | |
c7d265a9 | 31 | \r |
32 | **/\r | |
5240b97c | 33 | CONST EFI_PEI_SERVICES **\r |
c7d265a9 | 34 | EFIAPI\r |
35 | GetPeiServicesTablePointer (\r | |
36 | VOID\r | |
37 | )\r | |
38 | {\r | |
5240b97c | 39 | CONST EFI_PEI_SERVICES **PeiServices;\r |
81c7803c | 40 | IA32_DESCRIPTOR Idtr;\r |
41 | \r | |
42 | AsmReadIdtr (&Idtr);\r | |
5240b97c | 43 | PeiServices = (CONST EFI_PEI_SERVICES **) (*(UINTN*)(Idtr.Base - sizeof (UINTN)));\r |
c7d265a9 | 44 | ASSERT (PeiServices != NULL);\r |
45 | return PeiServices;\r | |
46 | }\r | |
47 | \r | |
81c7803c | 48 | /**\r |
f38fdc74 | 49 | The function set the pointer of PEI services immediately preceding the IDT table\r |
50 | according to PI specification.\r | |
81c7803c | 51 | \r |
f38fdc74 | 52 | @param PeiServicesTablePointer The address of PeiServices pointer.\r |
81c7803c | 53 | **/\r |
54 | VOID\r | |
55 | EFIAPI\r | |
56 | SetPeiServicesTablePointer (\r | |
a86fda43 | 57 | IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer\r |
81c7803c | 58 | )\r |
59 | {\r | |
60 | IA32_DESCRIPTOR Idtr;\r | |
61 | \r | |
62 | AsmReadIdtr (&Idtr);\r | |
5dd39dc6 | 63 | (*(UINTN*)(Idtr.Base - sizeof (UINTN))) = (UINTN)PeiServicesTablePointer;\r |
81c7803c | 64 | }\r |
65 | \r | |
81c7803c | 66 | \r |