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[MODERN FEATURES] CPUID and MSR

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This commit is contained in:
Thomas Lovén
2017-01-24 12:21:54 +01:00
parent b7c0de7ea5
commit d801e0fd6c
6 changed files with 113 additions and 1 deletions
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27
kernel/arch/cpuid.c Normal file
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#include <cpuid.h>
#include <stdint.h>
#include <debug.h>
uint32_t cpuid_features_b, cpuid_features_c, cpuid_features_d;
uint32_t cpuid_featuresx_b, cpuid_featuresx_c, cpuid_featuresx_d;
uint32_t cpuid_signature;
uint32_t cpuid_max=0x0, cpuid_maxx=0x80000000;
void cpuid(uint32_t code, uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d)
{
uint32_t scrap;
if(!a) a = &scrap;
if(!b) b = &scrap;
if(!c) c = &scrap;
if(!d) d = &scrap;
if((code < CPUID_FUNCTIONX_VENDOR && code > cpuid_max) || code > cpuid_maxx)
{
*a = *b = *c = *d = -1;
return;
}
asm volatile("cpuid" : "=a"(*a), "=b"(*b), "=c"(*c), "=d"(*d) : "a"(code));
}