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1 | /** @file\r | |
2 | x64-specifc functionality for DxeLoad.\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | \r | |
7 | **/\r | |
8 | \r | |
9 | #include "DxeIpl.h"\r | |
10 | #include "X64/VirtualMemory.h"\r | |
11 | \r | |
12 | /**\r | |
13 | Transfers control to DxeCore.\r | |
14 | \r | |
15 | This function performs a CPU architecture specific operations to execute\r | |
16 | the entry point of DxeCore with the parameters of HobList.\r | |
17 | It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.\r | |
18 | \r | |
19 | @param DxeCoreEntryPoint The entry point of DxeCore.\r | |
20 | @param HobList The start of HobList passed to DxeCore.\r | |
21 | \r | |
22 | **/\r | |
23 | VOID\r | |
24 | HandOffToDxeCore (\r | |
25 | IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,\r | |
26 | IN EFI_PEI_HOB_POINTERS HobList\r | |
27 | )\r | |
28 | {\r | |
29 | VOID *BaseOfStack;\r | |
30 | VOID *TopOfStack;\r | |
31 | EFI_STATUS Status;\r | |
32 | UINTN PageTables;\r | |
33 | UINT32 Index;\r | |
34 | EFI_VECTOR_HANDOFF_INFO *VectorInfo;\r | |
35 | EFI_PEI_VECTOR_HANDOFF_INFO_PPI *VectorHandoffInfoPpi;\r | |
36 | VOID *GhcbBase;\r | |
37 | UINTN GhcbSize;\r | |
38 | \r | |
39 | //\r | |
40 | // Clear page 0 and mark it as allocated if NULL pointer detection is enabled.\r | |
41 | //\r | |
42 | if (IsNullDetectionEnabled ()) {\r | |
43 | ClearFirst4KPage (HobList.Raw);\r | |
44 | BuildMemoryAllocationHob (0, EFI_PAGES_TO_SIZE (1), EfiBootServicesData);\r | |
45 | }\r | |
46 | \r | |
47 | //\r | |
48 | // Get Vector Hand-off Info PPI and build Guided HOB\r | |
49 | //\r | |
50 | Status = PeiServicesLocatePpi (\r | |
51 | &gEfiVectorHandoffInfoPpiGuid,\r | |
52 | 0,\r | |
53 | NULL,\r | |
54 | (VOID **)&VectorHandoffInfoPpi\r | |
55 | );\r | |
56 | if (Status == EFI_SUCCESS) {\r | |
57 | DEBUG ((DEBUG_INFO, "Vector Hand-off Info PPI is gotten, GUIDed HOB is created!\n"));\r | |
58 | VectorInfo = VectorHandoffInfoPpi->Info;\r | |
59 | Index = 1;\r | |
60 | while (VectorInfo->Attribute != EFI_VECTOR_HANDOFF_LAST_ENTRY) {\r | |
61 | VectorInfo++;\r | |
62 | Index++;\r | |
63 | }\r | |
64 | \r | |
65 | BuildGuidDataHob (\r | |
66 | &gEfiVectorHandoffInfoPpiGuid,\r | |
67 | VectorHandoffInfoPpi->Info,\r | |
68 | sizeof (EFI_VECTOR_HANDOFF_INFO) * Index\r | |
69 | );\r | |
70 | }\r | |
71 | \r | |
72 | //\r | |
73 | // Allocate 128KB for the Stack\r | |
74 | //\r | |
75 | BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));\r | |
76 | ASSERT (BaseOfStack != NULL);\r | |
77 | \r | |
78 | //\r | |
79 | // Compute the top of the stack we were allocated. Pre-allocate a UINTN\r | |
80 | // for safety.\r | |
81 | //\r | |
82 | TopOfStack = (VOID *)((UINTN)BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);\r | |
83 | TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);\r | |
84 | \r | |
85 | //\r | |
86 | // Get the address and size of the GHCB pages\r | |
87 | //\r | |
88 | GhcbBase = (VOID *)PcdGet64 (PcdGhcbBase);\r | |
89 | GhcbSize = PcdGet64 (PcdGhcbSize);\r | |
90 | \r | |
91 | PageTables = 0;\r | |
92 | if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {\r | |
93 | //\r | |
94 | // Create page table and save PageMapLevel4 to CR3\r | |
95 | //\r | |
96 | PageTables = CreateIdentityMappingPageTables (\r | |
97 | (EFI_PHYSICAL_ADDRESS)(UINTN)BaseOfStack,\r | |
98 | STACK_SIZE,\r | |
99 | (EFI_PHYSICAL_ADDRESS)(UINTN)GhcbBase,\r | |
100 | GhcbSize\r | |
101 | );\r | |
102 | } else {\r | |
103 | //\r | |
104 | // Set NX for stack feature also require PcdDxeIplBuildPageTables be TRUE\r | |
105 | // for the DxeIpl and the DxeCore are both X64.\r | |
106 | //\r | |
107 | ASSERT (PcdGetBool (PcdSetNxForStack) == FALSE);\r | |
108 | ASSERT (PcdGetBool (PcdCpuStackGuard) == FALSE);\r | |
109 | }\r | |
110 | \r | |
111 | //\r | |
112 | // End of PEI phase signal\r | |
113 | //\r | |
114 | Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);\r | |
115 | ASSERT_EFI_ERROR (Status);\r | |
116 | \r | |
117 | if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {\r | |
118 | AsmWriteCr3 (PageTables);\r | |
119 | }\r | |
120 | \r | |
121 | //\r | |
122 | // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.\r | |
123 | //\r | |
124 | UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN)BaseOfStack, STACK_SIZE);\r | |
125 | \r | |
126 | //\r | |
127 | // Transfer the control to the entry point of DxeCore.\r | |
128 | //\r | |
129 | SwitchStack (\r | |
130 | (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,\r | |
131 | HobList.Raw,\r | |
132 | NULL,\r | |
133 | TopOfStack\r | |
134 | );\r | |
135 | }\r |