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detect cpu instrcution "rdtscp"

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This commit is contained in:
Stefan Lankes 2015-07-31 21:58:53 +02:00
parent 43308244dc
commit 38a6694d46
2 changed files with 9 additions and 2 deletions
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5
hermit/arch/x86/include/asm/processor.h
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@ -76,6 +76,7 @@ extern "C" {
#define CPU_FEATURE_SYSCALL (1 << 11)
#define CPU_FEATURE_NX (1 << 20)
#define CPU_FEATURE_1GBHP (1 << 26)
#define CPU_FEATURE_RDTSCP (1 << 27)
#define CPU_FEATURE_LM (1 << 29)
// feature list 0x00000007:0
@ -291,6 +292,10 @@ inline static uint32_t has_avx2(void) {
return cpu_info.feature4 & CPU_FEATURE_AVX2;
}
inline static uint32_t has_rdtscp(void) {
return (cpu_info.feature3 & CPU_FEATURE_RDTSCP);
}
/// clear TS bit in cr0
static inline void clts(void)
{

6
hermit/arch/x86/kernel/processor.c
View file

@ -207,6 +207,7 @@ int cpu_detection(void) {
cr4 |= CR4_OSXSAVE;
if (has_pge())
cr4 |= CR4_PGE;
cr4 &= ~CR4_TSD; // => every privilege level is able to use rdtsc
write_cr4(cr4);
if (has_xsave())
@ -268,7 +269,7 @@ int cpu_detection(void) {
a = b = c = d = 0;
cpuid(1, &a, &b, &cpu_info.feature2, &cpu_info.feature1);
kprintf("CPU features: %s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
kprintf("CPU features: %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
has_sse() ? "SSE " : "",
has_sse2() ? "SSE2 " : "",
has_sse3() ? "SSE3 " : "",
@ -282,7 +283,8 @@ int cpu_detection(void) {
has_fpu() ? "FPU " : "",
has_fxsr() ? "FXSR " : "",
has_xsave() ? "XSAVE " : "",
has_osxsave() ? "OSXSAVE " : "");
has_osxsave() ? "OSXSAVE " : "",
has_rdtscp() ? "RDTSCP " : "");
}
if (first_time && has_osxsave()) {