slimbootloader/BootloaderCommonPkg/Library/ShellLib/CmdUcode.c

/** @file
  Shell command `ucode` to display the loaded microcode patch version.

  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <Library/ShellLib.h>

/**
  Display microcode version.

  @param[in]  Shell        shell instance
  @param[in]  Argc         number of command line arguments
  @param[in]  Argv         command line arguments

  @retval EFI_SUCCESS

**/
STATIC
EFI_STATUS
EFIAPI
ShellCommandUcodeFunc (
  IN SHELL  *Shell,
  IN UINTN   Argc,
  IN CHAR16 *Argv[]
  );

CONST SHELL_COMMAND ShellCommandUcode = {
  L"ucode",
  L"Display microcode version",
  &ShellCommandUcodeFunc
};

/**
  Display microcode version.

  @param[in]  Shell        shell instance
  @param[in]  Argc         number of command line arguments
  @param[in]  Argv         command line arguments

  @retval EFI_SUCCESS

**/
STATIC
EFI_STATUS
EFIAPI
ShellCommandUcodeFunc (
  IN SHELL  *Shell,
  IN UINTN   Argc,
  IN CHAR16 *Argv[]
  )
{
  UINT64 Value;

  AsmWriteMsr64 (0x8b, 0LL);
  AsmCpuid (0, NULL, NULL, NULL, NULL);
  Value = AsmReadMsr64 (0x8b);

  ShellPrint (L"IA32_BIOS_SIGN_ID: 0x%llx\n", Value);

  return EFI_SUCCESS;
}