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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 | |
fcfd5fb0 | 7 | Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>\r |
19388d29 | 8 | This program and the accompanying materials \r |
bf231ea6 A |
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 | |
2fc59a00 | 11 | http://opensource.org/licenses/bsd-license.php. \r |
bf231ea6 A |
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 | |
fcfd5fb0 LG |
23 | #include <Library/BaseMemoryLib.h>\r |
24 | #include <Ppi/TemporaryRamSupport.h>\r | |
c7d265a9 | 25 | \r |
26 | /**\r | |
4b8157f9 | 27 | Retrieves the cached value of the PEI Services Table pointer.\r |
f38fdc74 | 28 | \r |
4b8157f9 | 29 | Returns the cached value of the PEI Services Table pointer in a CPU specific manner \r |
30 | as specified in the CPU binding section of the Platform Initialization Pre-EFI \r | |
31 | Initialization Core Interface Specification.\r | |
32 | \r | |
33 | If the cached PEI Services Table pointer is NULL, then ASSERT().\r | |
f38fdc74 | 34 | \r |
4b8157f9 | 35 | @return The pointer to PeiServices.\r |
c7d265a9 | 36 | \r |
37 | **/\r | |
5240b97c | 38 | CONST EFI_PEI_SERVICES **\r |
c7d265a9 | 39 | EFIAPI\r |
40 | GetPeiServicesTablePointer (\r | |
41 | VOID\r | |
42 | )\r | |
43 | {\r | |
5240b97c | 44 | CONST EFI_PEI_SERVICES **PeiServices;\r |
81c7803c | 45 | IA32_DESCRIPTOR Idtr;\r |
46 | \r | |
47 | AsmReadIdtr (&Idtr);\r | |
5240b97c | 48 | PeiServices = (CONST EFI_PEI_SERVICES **) (*(UINTN*)(Idtr.Base - sizeof (UINTN)));\r |
c7d265a9 | 49 | ASSERT (PeiServices != NULL);\r |
50 | return PeiServices;\r | |
51 | }\r | |
52 | \r | |
81c7803c | 53 | /**\r |
4b8157f9 | 54 | Caches a pointer PEI Services Table. \r |
55 | \r | |
56 | Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer \r | |
57 | in a CPU specific manner as specified in the CPU binding section of the Platform Initialization \r | |
58 | Pre-EFI Initialization Core Interface Specification. \r | |
f38fdc74 | 59 | The function set the pointer of PEI services immediately preceding the IDT table\r |
60 | according to PI specification.\r | |
81c7803c | 61 | \r |
4b8157f9 | 62 | If PeiServicesTablePointer is NULL, then ASSERT().\r |
63 | \r | |
f38fdc74 | 64 | @param PeiServicesTablePointer The address of PeiServices pointer.\r |
81c7803c | 65 | **/\r |
66 | VOID\r | |
67 | EFIAPI\r | |
68 | SetPeiServicesTablePointer (\r | |
a86fda43 | 69 | IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer\r |
81c7803c | 70 | )\r |
71 | {\r | |
fcfd5fb0 LG |
72 | IA32_DESCRIPTOR Idtr;\r |
73 | EFI_PHYSICAL_ADDRESS IdtBase;\r | |
74 | EFI_STATUS Status;\r | |
75 | EFI_PEI_TEMPORARY_RAM_SUPPORT_PPI *TemporaryRamSupportPpi;\r | |
81c7803c | 76 | \r |
4b8157f9 | 77 | ASSERT (PeiServicesTablePointer != NULL);\r |
81c7803c | 78 | AsmReadIdtr (&Idtr);\r |
fcfd5fb0 LG |
79 | if ((*(UINTN*)(Idtr.Base - sizeof (UINTN))) != (UINTN)PeiServicesTablePointer) {\r |
80 | (*(UINTN*)(Idtr.Base - sizeof (UINTN))) = (UINTN)PeiServicesTablePointer;\r | |
81 | Status = (*PeiServicesTablePointer)->LocatePpi (\r | |
82 | PeiServicesTablePointer, \r | |
83 | &gEfiTemporaryRamSupportPpiGuid, \r | |
84 | 0, \r | |
85 | NULL, \r | |
86 | (VOID**)&TemporaryRamSupportPpi\r | |
87 | );\r | |
88 | \r | |
89 | if (EFI_ERROR (Status)) {\r | |
90 | //\r | |
91 | // If TemporaryRamSupportPpi is not found, Idt table needs to be migrated into memory.\r | |
92 | //\r | |
93 | Status = (*PeiServicesTablePointer)->AllocatePages (\r | |
94 | PeiServicesTablePointer, \r | |
95 | EfiBootServicesCode,\r | |
96 | EFI_SIZE_TO_PAGES(Idtr.Limit + 1 + sizeof (UINTN)),\r | |
97 | &IdtBase\r | |
98 | );\r | |
99 | if (!EFI_ERROR (Status)) {\r | |
100 | //\r | |
101 | // Migrate Idt table\r | |
102 | //\r | |
103 | CopyMem ((VOID *) (UINTN) IdtBase, (VOID *) (Idtr.Base - sizeof (UINTN)), Idtr.Limit + 1 + sizeof (UINTN));\r | |
104 | Idtr.Base = (UINTN) IdtBase + sizeof (UINTN);\r | |
105 | AsmWriteIdtr (&Idtr);\r | |
106 | }\r | |
107 | }\r | |
108 | }\r | |
81c7803c | 109 | }\r |
110 | \r | |
81c7803c | 111 | \r |