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ea0f431c JF |
1 | /** @file\r |
2 | Implementation of loading microcode on processors.\r | |
3 | \r | |
15dbb393 | 4 | Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>\r |
ea0f431c JF |
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 "CpuMpPei.h"\r | |
16 | \r | |
17 | /**\r | |
18 | Get microcode update signature of currently loaded microcode update.\r | |
19 | \r | |
20 | @return Microcode signature.\r | |
21 | \r | |
22 | **/\r | |
23 | UINT32\r | |
24 | GetCurrentMicrocodeSignature (\r | |
25 | VOID\r | |
26 | )\r | |
27 | {\r | |
28 | UINT64 Signature;\r | |
29 | \r | |
30 | AsmWriteMsr64 (EFI_MSR_IA32_BIOS_SIGN_ID, 0);\r | |
31 | AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, NULL, NULL);\r | |
32 | Signature = AsmReadMsr64 (EFI_MSR_IA32_BIOS_SIGN_ID);\r | |
33 | return (UINT32) RShiftU64 (Signature, 32);\r | |
34 | }\r | |
35 | \r | |
36 | /**\r | |
37 | Detect whether specified processor can find matching microcode patch and load it.\r | |
38 | \r | |
39 | **/\r | |
40 | VOID\r | |
41 | MicrocodeDetect (\r | |
42 | VOID\r | |
43 | )\r | |
44 | {\r | |
45 | UINT64 MicrocodePatchAddress;\r | |
46 | UINT64 MicrocodePatchRegionSize;\r | |
47 | UINT32 ExtendedTableLength;\r | |
48 | UINT32 ExtendedTableCount;\r | |
49 | EFI_CPU_MICROCODE_EXTENDED_TABLE *ExtendedTable;\r | |
50 | EFI_CPU_MICROCODE_EXTENDED_TABLE_HEADER *ExtendedTableHeader;\r | |
51 | EFI_CPU_MICROCODE_HEADER *MicrocodeEntryPoint;\r | |
52 | UINTN MicrocodeEnd;\r | |
53 | UINTN Index;\r | |
54 | UINT8 PlatformId;\r | |
55 | UINT32 RegEax;\r | |
46fd1182 | 56 | UINT32 CurrentRevision;\r |
ea0f431c JF |
57 | UINT32 LatestRevision;\r |
58 | UINTN TotalSize;\r | |
59 | UINT32 CheckSum32;\r | |
60 | BOOLEAN CorrectMicrocode;\r | |
ea0f431c JF |
61 | MICROCODE_INFO MicrocodeInfo;\r |
62 | \r | |
63 | ZeroMem (&MicrocodeInfo, sizeof (MICROCODE_INFO));\r | |
64 | MicrocodePatchAddress = PcdGet64 (PcdCpuMicrocodePatchAddress);\r | |
65 | MicrocodePatchRegionSize = PcdGet64 (PcdCpuMicrocodePatchRegionSize);\r | |
66 | if (MicrocodePatchRegionSize == 0) {\r | |
67 | //\r | |
68 | // There is no microcode patches\r | |
69 | //\r | |
70 | return;\r | |
71 | }\r | |
72 | \r | |
46fd1182 JF |
73 | CurrentRevision = GetCurrentMicrocodeSignature ();\r |
74 | if (CurrentRevision != 0) {\r | |
75 | //\r | |
76 | // Skip loading microcode if it has been loaded successfully\r | |
77 | //\r | |
78 | return;\r | |
79 | }\r | |
80 | \r | |
ea0f431c JF |
81 | ExtendedTableLength = 0;\r |
82 | //\r | |
83 | // Here data of CPUID leafs have not been collected into context buffer, so\r | |
84 | // GetProcessorCpuid() cannot be used here to retrieve CPUID data.\r | |
85 | //\r | |
86 | AsmCpuid (CPUID_VERSION_INFO, &RegEax, NULL, NULL, NULL);\r | |
87 | \r | |
88 | //\r | |
89 | // The index of platform information resides in bits 50:52 of MSR IA32_PLATFORM_ID\r | |
90 | //\r | |
91 | PlatformId = (UINT8) AsmMsrBitFieldRead64 (EFI_MSR_IA32_PLATFORM_ID, 50, 52);\r | |
92 | \r | |
93 | LatestRevision = 0;\r | |
94 | MicrocodeEnd = (UINTN) (MicrocodePatchAddress + MicrocodePatchRegionSize);\r | |
95 | MicrocodeEntryPoint = (EFI_CPU_MICROCODE_HEADER *) (UINTN) MicrocodePatchAddress;\r | |
96 | do {\r | |
97 | //\r | |
98 | // Check if the microcode is for the Cpu and the version is newer\r | |
99 | // and the update can be processed on the platform\r | |
100 | //\r | |
101 | CorrectMicrocode = FALSE;\r | |
102 | if (MicrocodeEntryPoint->HeaderVersion == 0x1) {\r | |
103 | //\r | |
104 | // It is the microcode header. It is not the padding data between microcode patches\r | |
8ed9ce80 | 105 | // because the padding data should not include 0x00000001 and it should be the repeated\r |
ea0f431c JF |
106 | // byte format (like 0xXYXYXYXY....).\r |
107 | //\r | |
108 | if (MicrocodeEntryPoint->ProcessorId == RegEax &&\r | |
109 | MicrocodeEntryPoint->UpdateRevision > LatestRevision &&\r | |
110 | (MicrocodeEntryPoint->ProcessorFlags & (1 << PlatformId))\r | |
111 | ) {\r | |
112 | if (MicrocodeEntryPoint->DataSize == 0) {\r | |
113 | CheckSum32 = CalculateSum32 ((UINT32 *)MicrocodeEntryPoint, 2048);\r | |
114 | } else {\r | |
115 | CheckSum32 = CalculateSum32 ((UINT32 *)MicrocodeEntryPoint, MicrocodeEntryPoint->DataSize + sizeof(EFI_CPU_MICROCODE_HEADER));\r | |
116 | }\r | |
117 | if (CheckSum32 == 0) {\r | |
118 | CorrectMicrocode = TRUE;\r | |
119 | }\r | |
120 | } else if ((MicrocodeEntryPoint->DataSize != 0) &&\r | |
121 | (MicrocodeEntryPoint->UpdateRevision > LatestRevision)) {\r | |
122 | ExtendedTableLength = MicrocodeEntryPoint->TotalSize - (MicrocodeEntryPoint->DataSize + sizeof (EFI_CPU_MICROCODE_HEADER));\r | |
123 | if (ExtendedTableLength != 0) {\r | |
124 | //\r | |
125 | // Extended Table exist, check if the CPU in support list\r | |
126 | //\r | |
127 | ExtendedTableHeader = (EFI_CPU_MICROCODE_EXTENDED_TABLE_HEADER *)((UINT8 *)(MicrocodeEntryPoint) + MicrocodeEntryPoint->DataSize + sizeof (EFI_CPU_MICROCODE_HEADER));\r | |
128 | //\r | |
129 | // Calculate Extended Checksum\r | |
130 | //\r | |
131 | if ((ExtendedTableLength % 4) == 0) {\r | |
132 | CheckSum32 = CalculateSum32 ((UINT32 *)ExtendedTableHeader, ExtendedTableLength);\r | |
133 | if (CheckSum32 == 0) {\r | |
134 | //\r | |
135 | // Checksum correct\r | |
136 | //\r | |
137 | ExtendedTableCount = ExtendedTableHeader->ExtendedSignatureCount;\r | |
138 | ExtendedTable = (EFI_CPU_MICROCODE_EXTENDED_TABLE *)(ExtendedTableHeader + 1);\r | |
139 | for (Index = 0; Index < ExtendedTableCount; Index ++) {\r | |
140 | CheckSum32 = CalculateSum32 ((UINT32 *)ExtendedTable, sizeof(EFI_CPU_MICROCODE_EXTENDED_TABLE));\r | |
141 | if (CheckSum32 == 0) {\r | |
142 | //\r | |
143 | // Verify Header\r | |
144 | //\r | |
145 | if ((ExtendedTable->ProcessorSignature == RegEax) &&\r | |
146 | (ExtendedTable->ProcessorFlag & (1 << PlatformId)) ) {\r | |
147 | //\r | |
148 | // Find one\r | |
149 | //\r | |
150 | CorrectMicrocode = TRUE;\r | |
151 | break;\r | |
152 | }\r | |
153 | }\r | |
154 | ExtendedTable ++;\r | |
155 | }\r | |
156 | }\r | |
157 | }\r | |
158 | }\r | |
159 | }\r | |
160 | } else {\r | |
161 | //\r | |
162 | // It is the padding data between the microcode patches for microcode patches alignment.\r | |
163 | // Because the microcode patch is the multiple of 1-KByte, the padding data should not\r | |
164 | // exist if the microcode patch alignment value is not larger than 1-KByte. So, the microcode\r | |
165 | // alignment value should be larger than 1-KByte. We could skip SIZE_1KB padding data to\r | |
166 | // find the next possible microcode patch header.\r | |
167 | //\r | |
168 | MicrocodeEntryPoint = (EFI_CPU_MICROCODE_HEADER *) (((UINTN) MicrocodeEntryPoint) + SIZE_1KB);\r | |
169 | continue;\r | |
170 | }\r | |
171 | //\r | |
172 | // Get the next patch.\r | |
173 | //\r | |
174 | if (MicrocodeEntryPoint->DataSize == 0) {\r | |
175 | TotalSize = 2048;\r | |
176 | } else {\r | |
177 | TotalSize = MicrocodeEntryPoint->TotalSize;\r | |
178 | }\r | |
179 | \r | |
180 | if (CorrectMicrocode) {\r | |
181 | LatestRevision = MicrocodeEntryPoint->UpdateRevision;\r | |
182 | MicrocodeInfo.MicrocodeData = (VOID *)((UINTN)MicrocodeEntryPoint + sizeof (EFI_CPU_MICROCODE_HEADER));\r | |
183 | MicrocodeInfo.MicrocodeSize = TotalSize;\r | |
184 | MicrocodeInfo.ProcessorId = RegEax;\r | |
185 | }\r | |
186 | \r | |
187 | MicrocodeEntryPoint = (EFI_CPU_MICROCODE_HEADER *) (((UINTN) MicrocodeEntryPoint) + TotalSize);\r | |
188 | } while (((UINTN) MicrocodeEntryPoint < MicrocodeEnd));\r | |
189 | \r | |
190 | if (LatestRevision > 0) {\r | |
191 | //\r | |
15dbb393 JF |
192 | // BIOS only authenticate updates that contain a numerically larger revision\r |
193 | // than the currently loaded revision, where Current Signature < New Update\r | |
194 | // Revision. A processor with no loaded update is considered to have a\r | |
195 | // revision equal to zero.\r | |
ea0f431c | 196 | //\r |
15dbb393 | 197 | if (LatestRevision > GetCurrentMicrocodeSignature ()) {\r |
ea0f431c JF |
198 | AsmWriteMsr64 (\r |
199 | EFI_MSR_IA32_BIOS_UPDT_TRIG,\r | |
200 | (UINT64) (UINTN) MicrocodeInfo.MicrocodeData\r | |
201 | );\r | |
15dbb393 JF |
202 | //\r |
203 | // Get and verify new microcode signature\r | |
204 | //\r | |
205 | ASSERT (LatestRevision == GetCurrentMicrocodeSignature ());\r | |
ea0f431c JF |
206 | MicrocodeInfo.Load = TRUE;\r |
207 | } else {\r | |
208 | MicrocodeInfo.Load = FALSE;\r | |
209 | }\r | |
210 | }\r | |
211 | }\r |