MdePkg/Library/BaseLib/Ia32/CpuId.c File Reference


Functions

UINT32 EFIAPI AsmCpuid (IN UINT32 Index, OUT UINT32 *RegisterEax, OUT UINT32 *RegisterEbx, OUT UINT32 *RegisterEcx, OUT UINT32 *RegisterEdx)

Detailed Description

AsmCpuid function.

Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.
This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this distribution. The full text of the license may be found at http://opensource.org/licenses/bsd-license.php.

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.


Function Documentation

UINT32 EFIAPI AsmCpuid ( IN UINT32  Index,
OUT UINT32 RegisterEax,
OUT UINT32 RegisterEbx,
OUT UINT32 RegisterEcx,
OUT UINT32 RegisterEdx 
)

Retrieves CPUID information.

Executes the CPUID instruction with EAX set to the value specified by Index. This function always returns Index. If Eax is not NULL, then the value of EAX after CPUID is returned in Eax. If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx. If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx. If Edx is not NULL, then the value of EDX after CPUID is returned in Edx. This function is only available on IA-32 and x64.

Parameters:
Index The 32-bit value to load into EAX prior to invoking the CPUID instruction.
RegisterEax A pointer to the 32-bit EAX value returned by the CPUID instruction. This is an optional parameter that may be NULL.
RegisterEbx A pointer to the 32-bit EBX value returned by the CPUID instruction. This is an optional parameter that may be NULL.
RegisterEcx A pointer to the 32-bit ECX value returned by the CPUID instruction. This is an optional parameter that may be NULL.
RegisterEdx A pointer to the 32-bit EDX value returned by the CPUID instruction. This is an optional parameter that may be NULL.
Returns:
Index.

References eax, ebx, ecx, edx, and mov.

Referenced by AsmFlushCacheLine(), SmmMemLibInternalCalculateMaximumSupportAddress(), and WriteBackInvalidateDataCacheRange().


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