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UefiCpuPkgNotes.md

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UDK2018 UefiCpuPkg Notes

  1. New Features and Changes
  2. Package Interface Changes
  3. Bug Fixes

NEW FEATURES AND CHANGES

  1. BaseXApicLib & BaseXApicX2ApicLib: Support AMD.

  2. CpuCommonFeaturesLib:

    1. Enable PPIN (Protected Processor Inventory Number) feature.
    2. Remove SENTER feature because it's merged to SMX feature.
    3. Enable LMCE (Local Machine Check Exception) feature.
    4. Enable PROC_TRACE (Processor Trace) feature.

  3. PiSmmCommunicationSmm: Deprecate SMM Communication ACPI Table.

  4. CpuExceptionHandlerLib: Use separate stack for exception handlers when stack guard is enabled.

  5. PiSmmCpuDxeSmm:

    1. Combine 2 separate INIT-SIPI-SIPI in S3 resume path to improve S3 boot performance.
    2. Produce EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL. It's used by SMM heap gurad feature.
    3. Enable NULL pointer detection in SMM environment.

  6. S3Resume2Pei:

    1. Signal EdkiiEndOfS3Resume event in the end of S3 resume path.
    2. Signal EdkiiS3SmmInitDone event after S3 SMM environment is initialized and before boot script is executed.

PACKAGE INTERFACE CHANGES

  1. Remove depecated macros in Include/Library/MtrrLib.h:

      FIRMWARE_VARIABLE_MTRR_NUMBER
      MTRR_LIB_IA32_MTRR_CAP
      MTRR_LIB_IA32_MTRR_CAP_VCNT_MASK
      MTRR_LIB_IA32_MTRR_FIX64K_00000
      MTRR_LIB_IA32_MTRR_FIX16K_80000
      MTRR_LIB_IA32_MTRR_FIX16K_A0000
      MTRR_LIB_IA32_MTRR_FIX4K_C0000
      MTRR_LIB_IA32_MTRR_FIX4K_C8000
      MTRR_LIB_IA32_MTRR_FIX4K_D0000
      MTRR_LIB_IA32_MTRR_FIX4K_D8000
      MTRR_LIB_IA32_MTRR_FIX4K_E0000
      MTRR_LIB_IA32_MTRR_FIX4K_E8000
      MTRR_LIB_IA32_MTRR_FIX4K_F0000
      MTRR_LIB_IA32_MTRR_FIX4K_F8000
      MTRR_LIB_IA32_VARIABLE_MTRR_BASE
      MTRR_LIB_IA32_VARIABLE_MTRR_END
      MTRR_LIB_IA32_MTRR_DEF_TYPE
      MTRR_LIB_MSR_VALID_MASK
      MTRR_LIB_CACHE_VALID_ADDRESS
      MTRR_LIB_CACHE_MTRR_ENABLED
      MTRR_LIB_CACHE_FIXED_MTRR_ENABLED

  1. MtrrLib: Add API MtrrSetMemoryAttributesInMtrrSettings().

  2. Add CPUID definitions for AMD: Include/Register/Amd/Cpuid.h.

BUG FIXES

  1. CpuCommonFeaturesLib: Fix a bug that wrongly enables SMX/VMX.

  2. CpuMpDxe: Fix a bug that may cause S4 resume failure.

  3. MtrrLib: Re-implement the library to guarantee optimal MTRR settings can always be calculated.

  4. MpInitLib:

    1. Completely initialize AP when AP is re-enabled.
    2. Fix a bug that causes AP enters timer interrupt handler in the source level debug enabled environment.
    3. Fix a bug that timer interrupt is disabled in new BSP after SwitchBSP().
    4. Fix a bug that causes system hang due to below-1MB free memory cannot be found in PEI phase for AP wake up buffer.
    5. Fix a bug that may cause AP cannot be waken up due to wrong references of StartupApSignal.

  5. CpuExceptionHandlerLib: Fix a bug that causes exception information cannot be dumped in release build.

  6. PiSmmMCpuDxeSmm: Fix potential infinite loop issue when SMM profile is enabled.

  7. SecCore: Fix a bug to guarantee correct SEC performance data can be got through SecPerformancePpi.

  8. CpuCommonFeaturesLib:

    1. Fix AESNI feature detection.
    2. Fix Haswell CPU hang with 50% throttling.
    3. Do not unconditionally enable MCA even it's disabled.