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/* cpuid2cpuflags -- X86 CPUID native getter
* (c) 2015-2024 Michał Górny
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "platforms.h"
#ifdef CPUID_X86
#include <cpuid.h>
#include "x86.h"
/**
* Run native CPUID for specified level, and fill passed register
* variables (where not NULL).
*
* Returns 1 on sucess, 0 if not supported by the CPU.
*/
int run_cpuid(uint32_t level, uint32_t* eax, uint32_t* ebx, uint32_t* ecx, uint32_t* edx)
{
uint32_t eax_, ebx_, ecx_, edx_;
/* We can't use __get_cpuid() since it can't do Centaur extended
* flags (it's limited to Intel & AMD namespaces by poor design) */
/* TODO: we need to figure out if 0xN0000000 is even valid
* otherwise it will fallback to last supported CPUID... */
if (__get_cpuid_max(level & 0xf0000000, 0) < level)
return 0;
__cpuid(level, eax_, ebx_, ecx_, edx_);
if (eax)
*eax = eax_;
if (ebx)
*ebx = ebx_;
if (ecx)
*ecx = ecx_;
if (edx)
*edx = edx_;
return 1;
}
/**
* Run native CPUID for specified level and subleaf, and fill passed
* register variables (where not NULL).
*
* Returns 1 on sucess, 0 if not supported by the CPU.
*/
int run_cpuid_sub(uint32_t level, uint32_t sublevel, uint32_t* eax, uint32_t* ebx, uint32_t* ecx, uint32_t* edx)
{
uint32_t eax_, ebx_, ecx_, edx_;
if (__get_cpuid_max(level & 0xf0000000, 0) < level)
return 0;
__cpuid_count(level, sublevel, eax_, ebx_, ecx_, edx_);
if (eax)
*eax = eax_;
if (ebx)
*ebx = ebx_;
if (ecx)
*ecx = ecx_;
if (edx)
*edx = edx_;
return 1;
}
#endif
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