80d671aea7
- the prototype changes to _cpuid(u32_t *eax, u32_t *ebx, u32_t *ecx, u32_t *edx) - this makes possible to use all the features of the cpuid instruction as described in the Intel specs
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
|
|
#include <stdint.h>
|
|
#include <minix/minlib.h>
|
|
#include <minix/cpufeature.h>
|
|
#include <sys/vm_i386.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;
|
|
case _CPUF_I386_SSEx:
|
|
return (edx & (CPUID1_EDX_FXSR |
|
|
CPUID1_EDX_SSE |
|
|
CPUID1_EDX_SSE2)) &&
|
|
(ecx & (CPUID1_ECX_SSE3 |
|
|
CPUID1_ECX_SSSE3 |
|
|
CPUID1_ECX_SSE4_1 |
|
|
CPUID1_ECX_SSE4_2));
|
|
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;
|
|
}
|
|
|