source: vbox/trunk/src/VBox/Devices/EFI/FirmwareNew/UefiCpuPkg/Include/Library/UefiCpuLib.h@ 99404

/** @file
  Public header file for UEFI CPU library class.

  This library class defines some routines that are generic for IA32 family CPU
  to be UEFI specification compliant.

  Copyright (c) 2009 - 2021, Intel Corporation. All rights reserved.<BR>
  Copyright (c) 2020, AMD Inc. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef __UEFI_CPU_LIB_H__
#define __UEFI_CPU_LIB_H__

/**
  Initializes floating point units for requirement of UEFI specification.

  This function initializes floating-point control word to 0x027F (all exceptions
  masked,double-precision, round-to-nearest) and multimedia-extensions control word
  (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
  for masked underflow).

**/
VOID
EFIAPI
InitializeFloatingPointUnits (
  VOID
  );

/**
  Determine if the standard CPU signature is "AuthenticAMD".

  @retval TRUE  The CPU signature matches.
  @retval FALSE The CPU signature does not match.

**/
BOOLEAN
EFIAPI
StandardSignatureIsAuthenticAMD (
  VOID
  );

/**
  Return the 32bit CPU family and model value.

  @return CPUID[01h].EAX with Processor Type and Stepping ID cleared.
**/
UINT32
EFIAPI
GetCpuFamilyModel (
  VOID
  );

/**
  Return the CPU stepping ID.
  @return CPU stepping ID value in CPUID[01h].EAX.
**/
UINT8
EFIAPI
GetCpuSteppingId (
  VOID
  );

#endif