UefiCpuPkg/Include/Library/UefiCpuLib.h

   1 /** @file
   2   Public header file for UEFI CPU library class.
   3
   4   This library class defines some routines that are generic for IA32 family CPU
   5   to be UEFI specification compliant.
   6
   7   Copyright (c) 2009 - 2021, Intel Corporation. All rights reserved.<BR>
   8   Copyright (c) 2020, AMD Inc. All rights reserved.<BR>
   9   SPDX-License-Identifier: BSD-2-Clause-Patent
  10
  11 **/
  12
  13 #ifndef __UEFI_CPU_LIB_H__
  14 #define __UEFI_CPU_LIB_H__
  15
  16 /**
  17   Initializes floating point units for requirement of UEFI specification.
  18
  19   This function initializes floating-point control word to 0x027F (all exceptions
  20   masked,double-precision, round-to-nearest) and multimedia-extensions control word
  21   (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
  22   for masked underflow).
  23
  24 **/
  25 VOID
  26 EFIAPI
  27 InitializeFloatingPointUnits (
  28   VOID
  29   );
  30
  31 /**
  32   Determine if the standard CPU signature is "AuthenticAMD".
  33
  34   @retval TRUE  The CPU signature matches.
  35   @retval FALSE The CPU signature does not match.
  36
  37 **/
  38 BOOLEAN
  39 EFIAPI
  40 StandardSignatureIsAuthenticAMD (
  41   VOID
  42   );
  43
  44 /**
  45   Return the 32bit CPU family and model value.
  46
  47   @return CPUID[01h].EAX with Processor Type and Stepping ID cleared.
  48 **/
  49 UINT32
  50 EFIAPI
  51 GetCpuFamilyModel (
  52   VOID
  53   );
  54
  55 /**
  56   Return the CPU stepping ID.
  57   @return CPU stepping ID value in CPUID[01h].EAX.
  58 **/
  59 UINT8
  60 EFIAPI
  61 GetCpuSteppingId (
  62   VOID
  63   );
  64
  65 #endif