878ba523ac
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.
67 lines
1.6 KiB
C
67 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;
|
|
}
|
|
|