UefiCpuPkg/Include/Guid/MicrocodePatchHob.h

   1 /** @file
   2   The microcode patch HOB is used to store the information of:
   3     A. Base address and size of the loaded microcode patches data;
   4     B. Detected microcode patch for each processor within system.
   5
   6   Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #ifndef _MICROCODE_PATCH_HOB_H_
  12 #define _MICROCODE_PATCH_HOB_H_
  13
  14 extern EFI_GUID gEdkiiMicrocodePatchHobGuid;
  15
  16 //
  17 // The EDKII microcode patch HOB will be produced by MpInitLib and it can be
  18 // consumed by modules that want to detect/apply microcode patches.
  19 //
  20 typedef struct {
  21   //
  22   // The base address of the microcode patches data after being loaded into
  23   // memory.
  24   //
  25   UINT64    MicrocodePatchAddress;
  26   //
  27   // The total size of the loaded microcode patches.
  28   //
  29   UINT64    MicrocodePatchRegionSize;
  30   //
  31   // The number of processors within the system.
  32   //
  33   UINT32    ProcessorCount;
  34   //
  35   // An array with 'ProcessorCount' elements that stores the offset (with
  36   // regard to 'MicrocodePatchAddress') of the detected microcode patch
  37   // (including the CPU_MICROCODE_HEADER data structure) for each processor.
  38   // If no microcode patch is detected for certain processor, the relating
  39   // element will be set to MAX_UINT64.
  40   //
  41   UINT64    ProcessorSpecificPatchOffset[0];
  42 } EDKII_MICROCODE_PATCH_HOB;
  43
  44 #endif