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1 | /** @file\r | |
2 | x64-specifc functionality for DxeLoad.\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include "DxeIpl.h"\r | |
16 | #include "X64/VirtualMemory.h"\r | |
17 | \r | |
18 | \r | |
19 | \r | |
20 | /**\r | |
21 | Transfers control to DxeCore.\r | |
22 | \r | |
23 | This function performs a CPU architecture specific operations to execute\r | |
24 | the entry point of DxeCore with the parameters of HobList.\r | |
25 | It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.\r | |
26 | \r | |
27 | @param DxeCoreEntryPoint The entry point of DxeCore.\r | |
28 | @param HobList The start of HobList passed to DxeCore.\r | |
29 | \r | |
30 | **/\r | |
31 | VOID\r | |
32 | HandOffToDxeCore (\r | |
33 | IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,\r | |
34 | IN EFI_PEI_HOB_POINTERS HobList\r | |
35 | )\r | |
36 | {\r | |
37 | VOID *BaseOfStack;\r | |
38 | VOID *TopOfStack;\r | |
39 | EFI_STATUS Status;\r | |
40 | UINTN PageTables;\r | |
41 | \r | |
42 | //\r | |
43 | // Allocate 128KB for the Stack\r | |
44 | //\r | |
45 | BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));\r | |
46 | ASSERT (BaseOfStack != NULL);\r | |
47 | \r | |
48 | //\r | |
49 | // Compute the top of the stack we were allocated. Pre-allocate a UINTN\r | |
50 | // for safety.\r | |
51 | //\r | |
52 | TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);\r | |
53 | TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);\r | |
54 | \r | |
55 | if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {\r | |
56 | //\r | |
57 | // Create page table and save PageMapLevel4 to CR3\r | |
58 | //\r | |
59 | PageTables = CreateIdentityMappingPageTables ();\r | |
60 | }\r | |
61 | \r | |
62 | //\r | |
63 | // End of PEI phase signal\r | |
64 | //\r | |
65 | Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);\r | |
66 | ASSERT_EFI_ERROR (Status);\r | |
67 | \r | |
68 | if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {\r | |
69 | AsmWriteCr3 (PageTables);\r | |
70 | }\r | |
71 | \r | |
72 | //\r | |
73 | // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.\r | |
74 | // \r | |
75 | UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);\r | |
76 | \r | |
77 | //\r | |
78 | // Transfer the control to the entry point of DxeCore.\r | |
79 | //\r | |
80 | SwitchStack (\r | |
81 | (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,\r | |
82 | HobList.Raw,\r | |
83 | NULL,\r | |
84 | TopOfStack\r | |
85 | );\r | |
86 | }\r |