minix/lib/i386/misc/_cpufeature.c

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#include <stdint.h>
#include <minix/minlib.h>
#include <minix/cpufeature.h>
#include <sys/vm_i386.h>
int _cpufeature(int cpufeature)
{
u32_t cpuid_feature_edx = 0;
u32_t cpuid_feature_ecx = 0;
int proc;
proc = getprocessor();
/* If processor supports CPUID and its CPUID supports enough
* parameters, retrieve EDX feature flags to test against.
*/
if(proc >= 586) {
u32_t params, a, b, c, d;
_cpuid(0, &params, &b, &c, &d);
if(params > 0) {
_cpuid(1, &a, &b, &cpuid_feature_ecx,
&cpuid_feature_edx);
}
}
switch(cpufeature) {
case _CPUF_I386_PSE:
return cpuid_feature_edx & CPUID1_EDX_PSE;
case _CPUF_I386_PGE:
return cpuid_feature_edx & CPUID1_EDX_PGE;
case _CPUF_I386_APIC_ON_CHIP:
return cpuid_feature_edx & CPUID1_EDX_APIC_ON_CHIP;
case _CPUF_I386_TSC:
return cpuid_feature_edx & CPUID1_EDX_TSC;
case _CPUF_I386_FPU:
return cpuid_feature_edx & CPUID1_EDX_FPU;
case _CPUF_I386_SSEx:
return (cpuid_feature_edx & (CPUID1_EDX_FXSR |
CPUID1_EDX_SSE |
CPUID1_EDX_SSE2)) &&
(cpuid_feature_ecx & (CPUID1_ECX_SSE3 |
CPUID1_ECX_SSSE3 |
CPUID1_ECX_SSE4_1 |
CPUID1_ECX_SSE4_2));
case _CPUF_I386_FXSR:
return cpuid_feature_edx & CPUID1_EDX_FXSR;
case _CPUF_I386_SSE:
return cpuid_feature_edx & CPUID1_EDX_SSE;
case _CPUF_I386_SSE2:
return cpuid_feature_edx & CPUID1_EDX_SSE2;
case _CPUF_I386_SSE3:
return cpuid_feature_ecx & CPUID1_ECX_SSE3;
case _CPUF_I386_SSSE3:
return cpuid_feature_ecx & CPUID1_ECX_SSSE3;
case _CPUF_I386_SSE4_1:
return cpuid_feature_ecx & CPUID1_ECX_SSE4_1;
case _CPUF_I386_SSE4_2:
return cpuid_feature_ecx & CPUID1_ECX_SSE4_2;
}
return 0;
}