UefiCpuLib.h File Reference

Functions
VOID EFIAPI	InitializeFloatingPointUnits (VOID)
BOOLEAN EFIAPI	StandardSignatureIsAuthenticAMD (VOID)
UINT32 EFIAPI	GetCpuFamilyModel (VOID)
UINT8 EFIAPI	GetCpuSteppingId (VOID)

Detailed Description

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.
Copyright (c) 2020, AMD Inc. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Function Documentation

UINT32 EFIAPI GetCpuFamilyModel

(

VOID

)

Return the 32bit CPU family and model value.

Returns

CPUID[01h].EAX with Processor Type and Stepping ID cleared.

UINT8 EFIAPI GetCpuSteppingId

(

VOID

)

Return the CPU stepping ID.

Returns

CPU stepping ID value in CPUID[01h].EAX.

VOID EFIAPI InitializeFloatingPointUnits

(

VOID

)

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).

BOOLEAN EFIAPI StandardSignatureIsAuthenticAMD

(

VOID

)

Determine if the standard CPU signature is "AuthenticAMD".

Return values

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