1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/** @file
Implementation of loading microcode on processors.
Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "MpLib.h"
/**
Get microcode update signature of currently loaded microcode update.
@return Microcode signature.
**/
UINT32
GetCurrentMicrocodeSignature (
VOID
)
{
MSR_IA32_BIOS_SIGN_ID_REGISTER BiosSignIdMsr;
AsmWriteMsr64 (MSR_IA32_BIOS_SIGN_ID, 0);
AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, NULL, NULL);
BiosSignIdMsr.Uint64 = AsmReadMsr64 (MSR_IA32_BIOS_SIGN_ID);
return BiosSignIdMsr.Bits.MicrocodeUpdateSignature;
}
/**
Detect whether specified processor can find matching microcode patch and load it.
@param[in] CpuMpData The pointer to CPU MP Data structure.
@param[in] IsBspCallIn Indicate whether the caller is BSP or not.
**/
VOID
MicrocodeDetect (
IN CPU_MP_DATA *CpuMpData,
IN BOOLEAN IsBspCallIn
)
{
UINT32 ExtendedTableLength;
UINT32 ExtendedTableCount;
CPU_MICROCODE_EXTENDED_TABLE *ExtendedTable;
CPU_MICROCODE_EXTENDED_TABLE_HEADER *ExtendedTableHeader;
CPU_MICROCODE_HEADER *MicrocodeEntryPoint;
UINTN MicrocodeEnd;
UINTN Index;
UINT8 PlatformId;
CPUID_VERSION_INFO_EAX Eax;
UINT32 CurrentRevision;
UINT32 LatestRevision;
UINTN TotalSize;
UINT32 CheckSum32;
BOOLEAN CorrectMicrocode;
VOID *MicrocodeData;
MSR_IA32_PLATFORM_ID_REGISTER PlatformIdMsr;
UINT32 ProcessorFlags;
UINT32 ThreadId;
if (CpuMpData->MicrocodePatchRegionSize == 0) {
//
// There is no microcode patches
//
return;
}
CurrentRevision = GetCurrentMicrocodeSignature ();
if (CurrentRevision != 0 && !IsBspCallIn) {
//
// Skip loading microcode if it has been loaded successfully
//
return;
}
GetProcessorLocationByApicId (GetInitialApicId (), NULL, NULL, &ThreadId);
if (ThreadId != 0) {
//
// Skip loading microcode if it is not the first thread in one core.
//
return;
}
ExtendedTableLength = 0;
//
// Here data of CPUID leafs have not been collected into context buffer, so
// GetProcessorCpuid() cannot be used here to retrieve CPUID data.
//
AsmCpuid (CPUID_VERSION_INFO, &Eax.Uint32, NULL, NULL, NULL);
//
// The index of platform information resides in bits 50:52 of MSR IA32_PLATFORM_ID
//
PlatformIdMsr.Uint64 = AsmReadMsr64 (MSR_IA32_PLATFORM_ID);
PlatformId = (UINT8) PlatformIdMsr.Bits.PlatformId;
//
// Check whether AP has same processor with BSP.
// If yes, direct use microcode info saved by BSP.
//
if (!IsBspCallIn) {
if ((CpuMpData->ProcessorSignature == Eax.Uint32) &&
(CpuMpData->ProcessorFlags & (1 << PlatformId)) != 0) {
MicrocodeData = (VOID *)(UINTN) CpuMpData->MicrocodeDataAddress;
LatestRevision = CpuMpData->MicrocodeRevision;
goto Done;
}
}
LatestRevision = 0;
MicrocodeData = NULL;
MicrocodeEnd = (UINTN) (CpuMpData->MicrocodePatchAddress + CpuMpData->MicrocodePatchRegionSize);
MicrocodeEntryPoint = (CPU_MICROCODE_HEADER *) (UINTN) CpuMpData->MicrocodePatchAddress;
do {
//
// Check if the microcode is for the Cpu and the version is newer
// and the update can be processed on the platform
//
CorrectMicrocode = FALSE;
if (MicrocodeEntryPoint->HeaderVersion == 0x1) {
//
// It is the microcode header. It is not the padding data between microcode patches
// because the padding data should not include 0x00000001 and it should be the repeated
// byte format (like 0xXYXYXYXY....).
//
if (MicrocodeEntryPoint->ProcessorSignature.Uint32 == Eax.Uint32 &&
MicrocodeEntryPoint->UpdateRevision > LatestRevision &&
(MicrocodeEntryPoint->ProcessorFlags & (1 << PlatformId))
) {
if (MicrocodeEntryPoint->DataSize == 0) {
CheckSum32 = CalculateSum32 ((UINT32 *) MicrocodeEntryPoint, 2048);
} else {
CheckSum32 = CalculateSum32 (
(UINT32 *) MicrocodeEntryPoint,
MicrocodeEntryPoint->DataSize + sizeof (CPU_MICROCODE_HEADER)
);
}
if (CheckSum32 == 0) {
CorrectMicrocode = TRUE;
ProcessorFlags = MicrocodeEntryPoint->ProcessorFlags;
}
} else if ((MicrocodeEntryPoint->DataSize != 0) &&
(MicrocodeEntryPoint->UpdateRevision > LatestRevision)) {
ExtendedTableLength = MicrocodeEntryPoint->TotalSize - (MicrocodeEntryPoint->DataSize +
sizeof (CPU_MICROCODE_HEADER));
if (ExtendedTableLength != 0) {
//
// Extended Table exist, check if the CPU in support list
//
ExtendedTableHeader = (CPU_MICROCODE_EXTENDED_TABLE_HEADER *) ((UINT8 *) (MicrocodeEntryPoint)
+ MicrocodeEntryPoint->DataSize + sizeof (CPU_MICROCODE_HEADER));
//
// Calculate Extended Checksum
//
if ((ExtendedTableLength % 4) == 0) {
CheckSum32 = CalculateSum32 ((UINT32 *) ExtendedTableHeader, ExtendedTableLength);
if (CheckSum32 == 0) {
//
// Checksum correct
//
ExtendedTableCount = ExtendedTableHeader->ExtendedSignatureCount;
ExtendedTable = (CPU_MICROCODE_EXTENDED_TABLE *) (ExtendedTableHeader + 1);
for (Index = 0; Index < ExtendedTableCount; Index ++) {
CheckSum32 = CalculateSum32 ((UINT32 *) ExtendedTable, sizeof(CPU_MICROCODE_EXTENDED_TABLE));
if (CheckSum32 == 0) {
//
// Verify Header
//
if ((ExtendedTable->ProcessorSignature.Uint32 == Eax.Uint32) &&
(ExtendedTable->ProcessorFlag & (1 << PlatformId)) ) {
//
// Find one
//
CorrectMicrocode = TRUE;
ProcessorFlags = ExtendedTable->ProcessorFlag;
break;
}
}
ExtendedTable ++;
}
}
}
}
}
} else {
//
// It is the padding data between the microcode patches for microcode patches alignment.
// Because the microcode patch is the multiple of 1-KByte, the padding data should not
// exist if the microcode patch alignment value is not larger than 1-KByte. So, the microcode
// alignment value should be larger than 1-KByte. We could skip SIZE_1KB padding data to
// find the next possible microcode patch header.
//
MicrocodeEntryPoint = (CPU_MICROCODE_HEADER *) (((UINTN) MicrocodeEntryPoint) + SIZE_1KB);
continue;
}
//
// Get the next patch.
//
if (MicrocodeEntryPoint->DataSize == 0) {
TotalSize = 2048;
} else {
TotalSize = MicrocodeEntryPoint->TotalSize;
}
if (CorrectMicrocode) {
LatestRevision = MicrocodeEntryPoint->UpdateRevision;
MicrocodeData = (VOID *) ((UINTN) MicrocodeEntryPoint + sizeof (CPU_MICROCODE_HEADER));
}
MicrocodeEntryPoint = (CPU_MICROCODE_HEADER *) (((UINTN) MicrocodeEntryPoint) + TotalSize);
} while (((UINTN) MicrocodeEntryPoint < MicrocodeEnd));
Done:
if (LatestRevision > CurrentRevision) {
//
// BIOS only authenticate updates that contain a numerically larger revision
// than the currently loaded revision, where Current Signature < New Update
// Revision. A processor with no loaded update is considered to have a
// revision equal to zero.
//
ASSERT (MicrocodeData != NULL);
AsmWriteMsr64 (
MSR_IA32_BIOS_UPDT_TRIG,
(UINT64) (UINTN) MicrocodeData
);
//
// Get and check new microcode signature
//
CurrentRevision = GetCurrentMicrocodeSignature ();
if (CurrentRevision != LatestRevision) {
AcquireSpinLock(&CpuMpData->MpLock);
DEBUG ((EFI_D_ERROR, "Updated microcode signature [0x%08x] does not match \
loaded microcode signature [0x%08x]\n", CurrentRevision, LatestRevision));
ReleaseSpinLock(&CpuMpData->MpLock);
}
}
if (IsBspCallIn && (LatestRevision != 0)) {
//
// Save BSP processor info and microcode info for later AP use.
//
CpuMpData->ProcessorSignature = Eax.Uint32;
CpuMpData->ProcessorFlags = ProcessorFlags;
CpuMpData->MicrocodeDataAddress = (UINTN) MicrocodeData;
CpuMpData->MicrocodeRevision = LatestRevision;
DEBUG ((DEBUG_INFO, "BSP Microcode:: signature [0x%08x], ProcessorFlags [0x%08x], \
MicroData [0x%08x], Revision [0x%08x]\n", Eax.Uint32, ProcessorFlags, (UINTN) MicrocodeData, LatestRevision));
}
}
|
