minix/lib/nbsd_libminlib/i386/_cpufeature.c
Gianluca Guida 878ba523ac Add libminlib for NBSD libc compilation.
This library includes various random and minix-specific functions
included in the Minix libc. Most of them should be part of libsys,
and in general it would be nice to extinguish this library over
time.
2011-03-22 13:47:35 +00:00

66 lines
1.6 KiB
C

#include <sys/types.h>
#include <stdint.h>
#include <minix/minlib.h>
#include <minix/cpufeature.h>
#include <machine/vm.h>
int _cpufeature(int cpufeature)
{
u32_t eax, ebx, ecx, edx;
int proc;
eax = ebx = ecx = edx = 0;
proc = getprocessor();
/* If processor supports CPUID and its CPUID supports enough
* parameters, retrieve EDX feature flags to test against.
*/
if(proc >= 586) {
eax = 0;
_cpuid(&eax, &ebx, &ecx, &edx);
if(eax > 0) {
eax = 1;
_cpuid(&eax, &ebx, &ecx, &edx);
}
}
switch(cpufeature) {
case _CPUF_I386_PSE:
return edx & CPUID1_EDX_PSE;
case _CPUF_I386_PGE:
return edx & CPUID1_EDX_PGE;
case _CPUF_I386_APIC_ON_CHIP:
return edx & CPUID1_EDX_APIC_ON_CHIP;
case _CPUF_I386_TSC:
return edx & CPUID1_EDX_TSC;
case _CPUF_I386_FPU:
return edx & CPUID1_EDX_FPU;
#define SSE_FULL_EDX (CPUID1_EDX_FXSR | CPUID1_EDX_SSE | CPUID1_EDX_SSE2)
#define SSE_FULL_ECX (CPUID1_ECX_SSE3 | CPUID1_ECX_SSSE3 | \
CPUID1_ECX_SSE4_1 | CPUID1_ECX_SSE4_2)
case _CPUF_I386_SSE1234_12:
return (edx & SSE_FULL_EDX) == SSE_FULL_EDX &&
(ecx & SSE_FULL_ECX) == SSE_FULL_ECX;
case _CPUF_I386_FXSR:
return edx & CPUID1_EDX_FXSR;
case _CPUF_I386_SSE:
return edx & CPUID1_EDX_SSE;
case _CPUF_I386_SSE2:
return edx & CPUID1_EDX_SSE2;
case _CPUF_I386_SSE3:
return ecx & CPUID1_ECX_SSE3;
case _CPUF_I386_SSSE3:
return ecx & CPUID1_ECX_SSSE3;
case _CPUF_I386_SSE4_1:
return ecx & CPUID1_ECX_SSE4_1;
case _CPUF_I386_SSE4_2:
return ecx & CPUID1_ECX_SSE4_2;
case _CPUF_I386_HTT:
return edx & CPUID1_EDX_HTT;
case _CPUF_I386_HTT_MAX_NUM:
return (ebx >> 16) & 0xff;
}
return 0;
}