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946bfba2 | 1 | /** @file\r |
2 | PEI Services Table Pointer Library.\r | |
d18d8a1d | 3 | \r |
bb89ec1a | 4 | Store PEI Services Table pointer via gEmulatorPkgTokenSpaceGuid.PcdPeiServicesTablePage.\r |
946bfba2 | 5 | This emulates a platform SRAM. The PI mechaism does not work in the emulator due to\r |
6 | lack of privledge.\r | |
7 | \r | |
8 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r | |
d18d8a1d | 9 | Portiions copyrigth (c) 2011, Apple Inc. All rights reserved.\r |
946bfba2 | 10 | This program and the accompanying materials\r |
11 | are licensed and made available under the terms and conditions of the BSD License\r | |
12 | which accompanies this distribution. The full text of the license may be found at\r | |
13 | http://opensource.org/licenses/bsd-license.php.\r | |
14 | \r | |
15 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
16 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
17 | \r | |
18 | **/\r | |
19 | \r | |
20 | #include <PiPei.h>\r | |
21 | #include <Library/PeiServicesTablePointerLib.h>\r | |
22 | #include <Library/DebugLib.h>\r | |
23 | #include <Library/EmuMagicPageLib.h>\r | |
24 | \r | |
25 | \r | |
26 | /**\r | |
d18d8a1d | 27 | Caches a pointer PEI Services Table.\r |
28 | \r | |
29 | Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer\r | |
30 | in a CPU specific manner as specified in the CPU binding section of the Platform Initialization\r | |
31 | Pre-EFI Initialization Core Interface Specification.\r | |
32 | \r | |
946bfba2 | 33 | If PeiServicesTablePointer is NULL, then ASSERT().\r |
d18d8a1d | 34 | \r |
946bfba2 | 35 | @param PeiServicesTablePointer The address of PeiServices pointer.\r |
36 | **/\r | |
37 | VOID\r | |
38 | EFIAPI\r | |
39 | SetPeiServicesTablePointer (\r | |
40 | IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer\r | |
41 | )\r | |
42 | {\r | |
43 | ASSERT (PeiServicesTablePointer != NULL);\r | |
44 | ASSERT (*PeiServicesTablePointer != NULL);\r | |
45 | EMU_MAGIC_PAGE()->PeiServicesTablePointer = PeiServicesTablePointer;\r | |
46 | }\r | |
47 | \r | |
48 | /**\r | |
49 | Retrieves the cached value of the PEI Services Table pointer.\r | |
50 | \r | |
d18d8a1d | 51 | Returns the cached value of the PEI Services Table pointer in a CPU specific manner\r |
52 | as specified in the CPU binding section of the Platform Initialization Pre-EFI\r | |
946bfba2 | 53 | Initialization Core Interface Specification.\r |
d18d8a1d | 54 | \r |
946bfba2 | 55 | If the cached PEI Services Table pointer is NULL, then ASSERT().\r |
56 | \r | |
57 | @return The pointer to PeiServices.\r | |
58 | \r | |
59 | **/\r | |
60 | CONST EFI_PEI_SERVICES **\r | |
61 | EFIAPI\r | |
62 | GetPeiServicesTablePointer (\r | |
63 | VOID\r | |
64 | )\r | |
65 | {\r | |
66 | CONST EFI_PEI_SERVICES **PeiServicesTablePointer;\r | |
d18d8a1d | 67 | \r |
946bfba2 | 68 | PeiServicesTablePointer = EMU_MAGIC_PAGE()->PeiServicesTablePointer;\r |
69 | ASSERT (PeiServicesTablePointer != NULL);\r | |
70 | ASSERT (*PeiServicesTablePointer != NULL);\r | |
71 | return PeiServicesTablePointer;\r | |
72 | }\r | |
73 | \r | |
95c2e69a LG |
74 | /**\r |
75 | Perform CPU specific actions required to migrate the PEI Services Table \r | |
76 | pointer from temporary RAM to permanent RAM.\r | |
77 | \r | |
78 | For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes \r | |
79 | immediately preceding the Interrupt Descriptor Table (IDT) in memory.\r | |
80 | For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes \r | |
81 | immediately preceding the Interrupt Descriptor Table (IDT) in memory.\r | |
82 | For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in\r | |
83 | a dedicated CPU register. This means that there is no memory storage \r | |
84 | associated with storing the PEI Services Table pointer, so no additional \r | |
85 | migration actions are required for Itanium or ARM CPUs.\r | |
86 | \r | |
87 | **/\r | |
88 | VOID\r | |
89 | EFIAPI\r | |
90 | MigratePeiServicesTablePointer (\r | |
91 | VOID\r | |
92 | )\r | |
93 | {\r | |
94 | //\r | |
95 | // PEI Services Table pointer is cached in SRAM. No additional \r | |
96 | // migration actions are required.\r | |
97 | //\r | |
98 | return;\r | |
99 | }\r | |
946bfba2 | 100 | \r |
101 | \r |