mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-18 15:27:48 +01:00
77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
|
/** @file
|
||
|
|
AsmCpuidEx function.
|
||
|
|
|
||
|
|
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
|
||
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
||
|
|
|
||
|
|
**/
|
||
|
|
|
||
|
|
/**
|
||
|
|
Retrieves CPUID information using an extended leaf identifier.
|
||
|
|
|
||
|
|
Executes the CPUID instruction with EAX set to the value specified by Index
|
||
|
|
and ECX set to the value specified by SubIndex. This function always returns
|
||
|
|
Index. This function is only available on IA-32 and x64.
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
@param Index The 32-bit value to load into EAX prior to invoking the
|
||
|
|
CPUID instruction.
|
||
|
|
@param SubIndex The 32-bit value to load into ECX 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
|
||
|
|
AsmCpuidEx (
|
||
|
|
IN UINT32 Index,
|
||
|
|
IN UINT32 SubIndex,
|
||
|
|
OUT UINT32 *RegisterEax, OPTIONAL
|
||
|
|
OUT UINT32 *RegisterEbx, OPTIONAL
|
||
|
|
OUT UINT32 *RegisterEcx, OPTIONAL
|
||
|
|
OUT UINT32 *RegisterEdx OPTIONAL
|
||
|
|
)
|
||
|
|
{
|
||
|
|
_asm {
|
||
|
|
mov eax, Index
|
||
|
|
mov ecx, SubIndex
|
||
|
|
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
|
||
|
|
}
|
||
|
|
}
|