You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.5 KiB
75 lines
2.5 KiB
4 years ago
|
/** @file
|
||
|
|
AsmCpuid function.
|
||
|
|
|
||
|
|
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
|
||
|
|
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.
|
||
|
|
|
||
|
|
**/
|
||
|
|
|
||
|
|
/**
|
||
|
|
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.
|
||
|
|
|
||
|
|
@param Index The 32-bit value to load into EAX prior to invoking the CPUID
|
||
|
|
instruction.
|
||
|
|
@param RegisterEax A pointer to the 32-bit EAX value returned by the CPUID
|
||
|
|
instruction. This is an optional parameter that may be NULL.
|
||
|
|
@param RegisterEbx A pointer to the 32-bit EBX value returned by the CPUID
|
||
|
|
instruction. This is an optional parameter that may be NULL.
|
||
|
|
@param RegisterEcx A pointer to the 32-bit ECX value returned by the CPUID
|
||
|
|
instruction. This is an optional parameter that may be NULL.
|
||
|
|
@param RegisterEdx A pointer to the 32-bit EDX value returned by the CPUID
|
||
|
|
instruction. This is an optional parameter that may be NULL.
|
||
|
|
|
||
|
|
@return Index.
|
||
|
|
|
||
|
|
**/
|
||
|
|
UINT32
|
||
|
|
EFIAPI
|
||
|
|
AsmCpuid (
|
||
|
|
IN UINT32 Index,
|
||
|
|
OUT UINT32 *RegisterEax, OPTIONAL
|
||
|
|
OUT UINT32 *RegisterEbx, OPTIONAL
|
||
|
|
OUT UINT32 *RegisterEcx, OPTIONAL
|
||
|
|
OUT UINT32 *RegisterEdx OPTIONAL
|
||
|
|
)
|
||
|
|
{
|
||
|
|
_asm {
|
||
|
|
mov eax, Index
|
||
|
|
cpuid
|
||
|
|
push ecx
|
||
|
|
mov ecx, RegisterEax
|
||
|
|
jecxz SkipEax
|
||
|
|
mov [ecx], eax
|
||
|
|
SkipEax:
|
||
|
|
mov ecx, RegisterEbx
|
||
|
|
jecxz SkipEbx
|
||
|
|
mov [ecx], ebx
|
||
|
|
SkipEbx:
|
||
|
|
pop eax
|
||
|
|
mov ecx, RegisterEcx
|
||
|
|
jecxz SkipEcx
|
||
|
|
mov [ecx], eax
|
||
|
|
SkipEcx:
|
||
|
|
mov ecx, RegisterEdx
|
||
|
|
jecxz SkipEdx
|
||
|
|
mov [ecx], edx
|
||
|
|
SkipEdx:
|
||
|
|
mov eax, Index
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|