1 /** @file
2 x64-specifc functionality for DxeLoad.
3
4 Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15 #include "DxeIpl.h"
16 #include "X64/VirtualMemory.h"
17
18
19
20 /**
21 Transfers control to DxeCore.
22
23 This function performs a CPU architecture specific operations to execute
24 the entry point of DxeCore with the parameters of HobList.
25 It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
26
27 @param DxeCoreEntryPoint The entry point of DxeCore.
28 @param HobList The start of HobList passed to DxeCore.
29
30 **/
31 VOID
HandOffToDxeCore(IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,IN EFI_PEI_HOB_POINTERS HobList)32 HandOffToDxeCore (
33 IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,
34 IN EFI_PEI_HOB_POINTERS HobList
35 )
36 {
37 VOID *BaseOfStack;
38 VOID *TopOfStack;
39 EFI_STATUS Status;
40 UINTN PageTables;
41 UINT32 Index;
42 EFI_VECTOR_HANDOFF_INFO *VectorInfo;
43 EFI_PEI_VECTOR_HANDOFF_INFO_PPI *VectorHandoffInfoPpi;
44
45 //
46 // Get Vector Hand-off Info PPI and build Guided HOB
47 //
48 Status = PeiServicesLocatePpi (
49 &gEfiVectorHandoffInfoPpiGuid,
50 0,
51 NULL,
52 (VOID **)&VectorHandoffInfoPpi
53 );
54 if (Status == EFI_SUCCESS) {
55 DEBUG ((EFI_D_INFO, "Vector Hand-off Info PPI is gotten, GUIDed HOB is created!\n"));
56 VectorInfo = VectorHandoffInfoPpi->Info;
57 Index = 1;
58 while (VectorInfo->Attribute != EFI_VECTOR_HANDOFF_LAST_ENTRY) {
59 VectorInfo ++;
60 Index ++;
61 }
62 BuildGuidDataHob (
63 &gEfiVectorHandoffInfoPpiGuid,
64 VectorHandoffInfoPpi->Info,
65 sizeof (EFI_VECTOR_HANDOFF_INFO) * Index
66 );
67 }
68
69 //
70 // Allocate 128KB for the Stack
71 //
72 BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
73 ASSERT (BaseOfStack != NULL);
74
75 //
76 // Compute the top of the stack we were allocated. Pre-allocate a UINTN
77 // for safety.
78 //
79 TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
80 TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
81
82 PageTables = 0;
83 if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
84 //
85 // Create page table and save PageMapLevel4 to CR3
86 //
87 PageTables = CreateIdentityMappingPageTables ((EFI_PHYSICAL_ADDRESS) (UINTN) BaseOfStack, STACK_SIZE);
88 } else {
89 //
90 // Set NX for stack feature also require PcdDxeIplBuildPageTables be TRUE
91 // for the DxeIpl and the DxeCore are both X64.
92 //
93 ASSERT (PcdGetBool (PcdSetNxForStack) == FALSE);
94 }
95
96 //
97 // End of PEI phase signal
98 //
99 Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
100 ASSERT_EFI_ERROR (Status);
101
102 if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
103 AsmWriteCr3 (PageTables);
104 }
105
106 //
107 // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
108 //
109 UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
110
111 //
112 // Transfer the control to the entry point of DxeCore.
113 //
114 SwitchStack (
115 (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
116 HobList.Raw,
117 NULL,
118 TopOfStack
119 );
120 }
121