diff options
Diffstat (limited to 'Core/UefiCpuPkg/CpuMpPei/Microcode.c')
| -rw-r--r-- | Core/UefiCpuPkg/CpuMpPei/Microcode.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/Core/UefiCpuPkg/CpuMpPei/Microcode.c b/Core/UefiCpuPkg/CpuMpPei/Microcode.c new file mode 100644 index 0000000000..f91f658d0a --- /dev/null +++ b/Core/UefiCpuPkg/CpuMpPei/Microcode.c @@ -0,0 +1,213 @@ +/** @file
+ Implementation of loading microcode on processors.
+
+ Copyright (c) 2015 - 2016, 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 "CpuMpPei.h"
+
+/**
+ Get microcode update signature of currently loaded microcode update.
+
+ @return Microcode signature.
+
+**/
+UINT32
+GetCurrentMicrocodeSignature (
+ VOID
+ )
+{
+ UINT64 Signature;
+
+ AsmWriteMsr64 (EFI_MSR_IA32_BIOS_SIGN_ID, 0);
+ AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, NULL, NULL);
+ Signature = AsmReadMsr64 (EFI_MSR_IA32_BIOS_SIGN_ID);
+ return (UINT32) RShiftU64 (Signature, 32);
+}
+
+/**
+ Detect whether specified processor can find matching microcode patch and load it.
+
+ @param PeiCpuMpData Pointer to PEI CPU MP Data
+**/
+VOID
+MicrocodeDetect (
+ IN PEI_CPU_MP_DATA *PeiCpuMpData
+ )
+{
+ UINT64 MicrocodePatchAddress;
+ UINT64 MicrocodePatchRegionSize;
+ UINT32 ExtendedTableLength;
+ UINT32 ExtendedTableCount;
+ EFI_CPU_MICROCODE_EXTENDED_TABLE *ExtendedTable;
+ EFI_CPU_MICROCODE_EXTENDED_TABLE_HEADER *ExtendedTableHeader;
+ EFI_CPU_MICROCODE_HEADER *MicrocodeEntryPoint;
+ UINTN MicrocodeEnd;
+ UINTN Index;
+ UINT8 PlatformId;
+ UINT32 RegEax;
+ UINT32 CurrentRevision;
+ UINT32 LatestRevision;
+ UINTN TotalSize;
+ UINT32 CheckSum32;
+ BOOLEAN CorrectMicrocode;
+ MICROCODE_INFO MicrocodeInfo;
+
+ ZeroMem (&MicrocodeInfo, sizeof (MICROCODE_INFO));
+ MicrocodePatchAddress = PcdGet64 (PcdCpuMicrocodePatchAddress);
+ MicrocodePatchRegionSize = PcdGet64 (PcdCpuMicrocodePatchRegionSize);
+ if (MicrocodePatchRegionSize == 0) {
+ //
+ // There is no microcode patches
+ //
+ return;
+ }
+
+ CurrentRevision = GetCurrentMicrocodeSignature ();
+ if (CurrentRevision != 0) {
+ //
+ // Skip loading microcode if it has been loaded successfully
+ //
+ 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, &RegEax, NULL, NULL, NULL);
+
+ //
+ // The index of platform information resides in bits 50:52 of MSR IA32_PLATFORM_ID
+ //
+ PlatformId = (UINT8) AsmMsrBitFieldRead64 (EFI_MSR_IA32_PLATFORM_ID, 50, 52);
+
+ LatestRevision = 0;
+ MicrocodeEnd = (UINTN) (MicrocodePatchAddress + MicrocodePatchRegionSize);
+ MicrocodeEntryPoint = (EFI_CPU_MICROCODE_HEADER *) (UINTN) 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
+ // becasue the padding data should not include 0x00000001 and it should be the repeated
+ // byte format (like 0xXYXYXYXY....).
+ //
+ if (MicrocodeEntryPoint->ProcessorId == RegEax &&
+ MicrocodeEntryPoint->UpdateRevision > LatestRevision &&
+ (MicrocodeEntryPoint->ProcessorFlags & (1 << PlatformId))
+ ) {
+ if (MicrocodeEntryPoint->DataSize == 0) {
+ CheckSum32 = CalculateSum32 ((UINT32 *)MicrocodeEntryPoint, 2048);
+ } else {
+ CheckSum32 = CalculateSum32 ((UINT32 *)MicrocodeEntryPoint, MicrocodeEntryPoint->DataSize + sizeof(EFI_CPU_MICROCODE_HEADER));
+ }
+ if (CheckSum32 == 0) {
+ CorrectMicrocode = TRUE;
+ }
+ } else if ((MicrocodeEntryPoint->DataSize != 0) &&
+ (MicrocodeEntryPoint->UpdateRevision > LatestRevision)) {
+ ExtendedTableLength = MicrocodeEntryPoint->TotalSize - (MicrocodeEntryPoint->DataSize + sizeof (EFI_CPU_MICROCODE_HEADER));
+ if (ExtendedTableLength != 0) {
+ //
+ // Extended Table exist, check if the CPU in support list
+ //
+ ExtendedTableHeader = (EFI_CPU_MICROCODE_EXTENDED_TABLE_HEADER *)((UINT8 *)(MicrocodeEntryPoint) + MicrocodeEntryPoint->DataSize + sizeof (EFI_CPU_MICROCODE_HEADER));
+ //
+ // Calculate Extended Checksum
+ //
+ if ((ExtendedTableLength % 4) == 0) {
+ CheckSum32 = CalculateSum32 ((UINT32 *)ExtendedTableHeader, ExtendedTableLength);
+ if (CheckSum32 == 0) {
+ //
+ // Checksum correct
+ //
+ ExtendedTableCount = ExtendedTableHeader->ExtendedSignatureCount;
+ ExtendedTable = (EFI_CPU_MICROCODE_EXTENDED_TABLE *)(ExtendedTableHeader + 1);
+ for (Index = 0; Index < ExtendedTableCount; Index ++) {
+ CheckSum32 = CalculateSum32 ((UINT32 *)ExtendedTable, sizeof(EFI_CPU_MICROCODE_EXTENDED_TABLE));
+ if (CheckSum32 == 0) {
+ //
+ // Verify Header
+ //
+ if ((ExtendedTable->ProcessorSignature == RegEax) &&
+ (ExtendedTable->ProcessorFlag & (1 << PlatformId)) ) {
+ //
+ // Find one
+ //
+ CorrectMicrocode = TRUE;
+ 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 = (EFI_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;
+ MicrocodeInfo.MicrocodeData = (VOID *)((UINTN)MicrocodeEntryPoint + sizeof (EFI_CPU_MICROCODE_HEADER));
+ MicrocodeInfo.MicrocodeSize = TotalSize;
+ MicrocodeInfo.ProcessorId = RegEax;
+ }
+
+ MicrocodeEntryPoint = (EFI_CPU_MICROCODE_HEADER *) (((UINTN) MicrocodeEntryPoint) + TotalSize);
+ } while (((UINTN) MicrocodeEntryPoint < MicrocodeEnd));
+
+ 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.
+ //
+ AsmWriteMsr64 (
+ EFI_MSR_IA32_BIOS_UPDT_TRIG,
+ (UINT64) (UINTN) MicrocodeInfo.MicrocodeData
+ );
+ //
+ // Get and check new microcode signature
+ //
+ CurrentRevision = GetCurrentMicrocodeSignature ();
+ if (CurrentRevision != LatestRevision) {
+ AcquireSpinLock(&PeiCpuMpData->MpLock);
+ DEBUG ((EFI_D_ERROR, "Updated microcode signature [0x%08x] does not match \
+ loaded microcode signature [0x%08x]\n", CurrentRevision, LatestRevision));
+ ReleaseSpinLock(&PeiCpuMpData->MpLock);
+ }
+ }
+}
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