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ab7017fe | 1 | /** @file\r |
2 | Create the variable to save the base address of page table and stack\r | |
3 | for transferring into long mode in IA32 capsule PEI.\r | |
4 | \r | |
b5040e4c | 5 | Copyright (c) 2011 - 2014, Intel Corporation. All rights reserved.<BR>\r |
ab7017fe | 6 | This program and the accompanying materials\r |
7 | are licensed and made available under the terms and conditions of the BSD License\r | |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | #include <Uefi.h>\r | |
17 | \r | |
18 | #include <Protocol/Capsule.h>\r | |
19 | #include <Protocol/DxeSmmReadyToLock.h>\r | |
b5040e4c | 20 | #include <Protocol/VariableLock.h>\r |
ab7017fe | 21 | \r |
22 | #include <Guid/CapsuleVendor.h>\r | |
23 | #include <Guid/AcpiS3Context.h>\r | |
24 | \r | |
25 | #include <Library/DebugLib.h>\r | |
26 | #include <Library/PcdLib.h>\r | |
27 | #include <Library/UefiBootServicesTableLib.h>\r | |
28 | #include <Library/UefiRuntimeServicesTableLib.h>\r | |
29 | #include <Library/UefiRuntimeLib.h>\r | |
30 | #include <Library/BaseLib.h>\r | |
ab7017fe | 31 | #include <Library/UefiLib.h>\r |
32 | #include <Library/BaseMemoryLib.h>\r | |
33 | #include <Library/HobLib.h>\r | |
34 | \r | |
35 | /**\r | |
fd9abd04 | 36 | Allocate EfiReservedMemoryType below 4G memory address.\r |
ab7017fe | 37 | \r |
fd9abd04 | 38 | This function allocates EfiReservedMemoryType below 4G memory address.\r |
ab7017fe | 39 | \r |
fd9abd04 | 40 | @param Size Size of memory to allocate.\r |
ab7017fe | 41 | \r |
fd9abd04 | 42 | @return Allocated Address for output.\r |
ab7017fe | 43 | \r |
44 | **/\r | |
45 | VOID*\r | |
fd9abd04 | 46 | AllocateReservedMemoryBelow4G (\r |
ab7017fe | 47 | IN UINTN Size\r |
48 | )\r | |
49 | {\r | |
50 | UINTN Pages;\r | |
51 | EFI_PHYSICAL_ADDRESS Address;\r | |
52 | EFI_STATUS Status;\r | |
53 | VOID* Buffer;\r | |
54 | \r | |
55 | Pages = EFI_SIZE_TO_PAGES (Size);\r | |
56 | Address = 0xffffffff;\r | |
57 | \r | |
58 | Status = gBS->AllocatePages (\r | |
59 | AllocateMaxAddress,\r | |
fd9abd04 | 60 | EfiReservedMemoryType,\r |
ab7017fe | 61 | Pages,\r |
62 | &Address\r | |
63 | );\r | |
64 | ASSERT_EFI_ERROR (Status);\r | |
65 | \r | |
66 | Buffer = (VOID *) (UINTN) Address;\r | |
67 | ZeroMem (Buffer, Size);\r | |
68 | \r | |
69 | return Buffer;\r | |
70 | }\r | |
71 | \r | |
72 | /**\r | |
b5040e4c EL |
73 | Register callback function upon VariableLockProtocol\r |
74 | to lock EFI_CAPSULE_LONG_MODE_BUFFER_NAME variable to avoid malicious code to update it.\r | |
ab7017fe | 75 | \r |
76 | @param[in] Event Event whose notification function is being invoked.\r | |
77 | @param[in] Context Pointer to the notification function's context.\r | |
78 | **/\r | |
79 | VOID\r | |
80 | EFIAPI\r | |
b5040e4c EL |
81 | VariableLockCapsuleLongModeBufferVariable (\r |
82 | IN EFI_EVENT Event,\r | |
83 | IN VOID *Context\r | |
ab7017fe | 84 | )\r |
85 | {\r | |
86 | EFI_STATUS Status;\r | |
b5040e4c | 87 | EDKII_VARIABLE_LOCK_PROTOCOL *VariableLock;\r |
ab7017fe | 88 | //\r |
b5040e4c | 89 | // Mark EFI_CAPSULE_LONG_MODE_BUFFER_NAME variable to read-only if the Variable Lock protocol exists\r |
ab7017fe | 90 | //\r |
b5040e4c | 91 | Status = gBS->LocateProtocol (&gEdkiiVariableLockProtocolGuid, NULL, (VOID **) &VariableLock);\r |
ab7017fe | 92 | if (!EFI_ERROR (Status)) {\r |
b5040e4c EL |
93 | Status = VariableLock->RequestToLock (VariableLock, EFI_CAPSULE_LONG_MODE_BUFFER_NAME, &gEfiCapsuleVendorGuid);\r |
94 | ASSERT_EFI_ERROR (Status);\r | |
ab7017fe | 95 | }\r |
b5040e4c EL |
96 | }\r |
97 | \r | |
98 | /**\r | |
fd9abd04 EL |
99 | 1. Allocate Reserved memory for capsule PEIM to establish a 1:1 Virtual to Physical mapping.\r |
100 | 2. Allocate Reserved memroy as a stack for capsule PEIM to transfer from 32-bit mdoe to 64-bit mode.\r | |
b5040e4c EL |
101 | \r |
102 | **/\r | |
103 | VOID\r | |
104 | EFIAPI\r | |
105 | PrepareContextForCapsulePei (\r | |
106 | VOID\r | |
107 | )\r | |
108 | {\r | |
109 | UINT32 RegEax;\r | |
110 | UINT32 RegEdx;\r | |
111 | UINTN TotalPagesNum;\r | |
112 | UINT8 PhysicalAddressBits;\r | |
113 | VOID *Hob;\r | |
114 | UINT32 NumberOfPml4EntriesNeeded;\r | |
115 | UINT32 NumberOfPdpEntriesNeeded;\r | |
116 | BOOLEAN Page1GSupport;\r | |
117 | EFI_CAPSULE_LONG_MODE_BUFFER LongModeBuffer;\r | |
118 | EFI_STATUS Status;\r | |
119 | VOID *Registration;\r | |
ab7017fe | 120 | \r |
b5040e4c | 121 | LongModeBuffer.PageTableAddress = (EFI_PHYSICAL_ADDRESS) PcdGet64 (PcdIdentifyMappingPageTablePtr);\r |
ab7017fe | 122 | \r |
b5040e4c | 123 | if (LongModeBuffer.PageTableAddress == 0x0) {\r |
ab7017fe | 124 | //\r |
b5040e4c | 125 | // Calculate the size of page table, allocate the memory, and set PcdIdentifyMappingPageTablePtr.\r |
ab7017fe | 126 | //\r |
b5040e4c EL |
127 | Page1GSupport = FALSE;\r |
128 | if (PcdGetBool(PcdUse1GPageTable)) {\r | |
129 | AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r | |
130 | if (RegEax >= 0x80000001) {\r | |
131 | AsmCpuid (0x80000001, NULL, NULL, NULL, &RegEdx);\r | |
132 | if ((RegEdx & BIT26) != 0) {\r | |
133 | Page1GSupport = TRUE;\r | |
134 | }\r | |
135 | }\r | |
136 | }\r | |
ab7017fe | 137 | \r |
b5040e4c EL |
138 | //\r |
139 | // Get physical address bits supported.\r | |
140 | //\r | |
ab7017fe | 141 | Hob = GetFirstHob (EFI_HOB_TYPE_CPU);\r |
142 | if (Hob != NULL) {\r | |
143 | PhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace;\r | |
b5040e4c EL |
144 | } else {\r |
145 | AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r | |
146 | if (RegEax >= 0x80000008) {\r | |
147 | AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);\r | |
148 | PhysicalAddressBits = (UINT8) RegEax;\r | |
149 | } else {\r | |
150 | PhysicalAddressBits = 36;\r | |
151 | }\r | |
ab7017fe | 152 | }\r |
153 | \r | |
154 | //\r | |
155 | // IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses.\r | |
156 | //\r | |
157 | ASSERT (PhysicalAddressBits <= 52);\r | |
158 | if (PhysicalAddressBits > 48) {\r | |
159 | PhysicalAddressBits = 48;\r | |
160 | }\r | |
161 | \r | |
162 | //\r | |
b5040e4c | 163 | // Calculate the table entries needed.\r |
ab7017fe | 164 | //\r |
165 | if (PhysicalAddressBits <= 39 ) {\r | |
166 | NumberOfPml4EntriesNeeded = 1;\r | |
b5040e4c | 167 | NumberOfPdpEntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 30));\r |
ab7017fe | 168 | } else {\r |
b5040e4c | 169 | NumberOfPml4EntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 39));\r |
ab7017fe | 170 | NumberOfPdpEntriesNeeded = 512;\r |
171 | }\r | |
172 | \r | |
b5040e4c EL |
173 | if (!Page1GSupport) {\r |
174 | TotalPagesNum = (NumberOfPdpEntriesNeeded + 1) * NumberOfPml4EntriesNeeded + 1;\r | |
175 | } else {\r | |
176 | TotalPagesNum = NumberOfPml4EntriesNeeded + 1;\r | |
177 | }\r | |
178 | \r | |
fd9abd04 | 179 | LongModeBuffer.PageTableAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateReservedMemoryBelow4G (EFI_PAGES_TO_SIZE (TotalPagesNum));\r |
ab7017fe | 180 | ASSERT (LongModeBuffer.PageTableAddress != 0);\r |
b5040e4c | 181 | PcdSet64 (PcdIdentifyMappingPageTablePtr, LongModeBuffer.PageTableAddress); \r |
ab7017fe | 182 | }\r |
b5040e4c EL |
183 | \r |
184 | //\r | |
185 | // Allocate stack\r | |
186 | //\r | |
187 | LongModeBuffer.StackSize = PcdGet32 (PcdCapsulePeiLongModeStackSize);\r | |
fd9abd04 | 188 | LongModeBuffer.StackBaseAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateReservedMemoryBelow4G (PcdGet32 (PcdCapsulePeiLongModeStackSize));\r |
b5040e4c EL |
189 | ASSERT (LongModeBuffer.StackBaseAddress != 0); \r |
190 | \r | |
ab7017fe | 191 | Status = gRT->SetVariable (\r |
192 | EFI_CAPSULE_LONG_MODE_BUFFER_NAME,\r | |
193 | &gEfiCapsuleVendorGuid,\r | |
b5040e4c | 194 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS,\r |
ab7017fe | 195 | sizeof (EFI_CAPSULE_LONG_MODE_BUFFER),\r |
196 | &LongModeBuffer\r | |
197 | );\r | |
b5040e4c EL |
198 | if (!EFI_ERROR (Status)) {\r |
199 | //\r | |
200 | // Register callback function upon VariableLockProtocol\r | |
201 | // to lock EFI_CAPSULE_LONG_MODE_BUFFER_NAME variable to avoid malicious code to update it.\r | |
202 | //\r | |
203 | EfiCreateProtocolNotifyEvent (\r | |
204 | &gEdkiiVariableLockProtocolGuid,\r | |
205 | TPL_CALLBACK,\r | |
206 | VariableLockCapsuleLongModeBufferVariable,\r | |
207 | NULL,\r | |
208 | &Registration\r | |
209 | ); \r | |
210 | } else {\r | |
211 | DEBUG ((EFI_D_ERROR, "FATAL ERROR: CapsuleLongModeBuffer cannot be saved: %r. Capsule in PEI may fail!\n", Status));\r | |
212 | gBS->FreePages (LongModeBuffer.StackBaseAddress, EFI_SIZE_TO_PAGES (LongModeBuffer.StackSize));\r | |
213 | }\r | |
ab7017fe | 214 | }\r |
215 | \r | |
216 | /**\r | |
217 | Create the variable to save the base address of page table and stack\r | |
218 | for transferring into long mode in IA32 capsule PEI.\r | |
219 | **/\r | |
220 | VOID\r | |
221 | SaveLongModeContext (\r | |
222 | VOID\r | |
223 | )\r | |
224 | {\r | |
ab7017fe | 225 | if ((FeaturePcdGet(PcdSupportUpdateCapsuleReset)) && (FeaturePcdGet (PcdDxeIplSwitchToLongMode))) {\r |
226 | //\r | |
b5040e4c | 227 | // Allocate memory for Capsule IA32 PEIM, it will create page table to transfer to long mode to access capsule above 4GB.\r |
ab7017fe | 228 | //\r |
b5040e4c | 229 | PrepareContextForCapsulePei ();\r |
ab7017fe | 230 | }\r |
231 | }\r |