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disable performance monitoring counter

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This commit is contained in:
Stefan Lankes 2017-11-05 21:06:48 +01:00
parent e3de05cb4c
commit 57feac36e4
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kernel/processor.c
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@ -451,7 +451,7 @@ int cpu_detection(void) {
kprintf("Syscall instruction: %s\n", (cpu_info.feature3 & CPU_FEATURE_SYSCALL) ? "available" : "unavailable");
}
//TODO: add check for SMEP and SMAP
//TODO: add check for SMEP, PCE and SMAP
// be sure that AM, NE and MP is enabled
cr0 = read_cr0();
@ -476,7 +476,9 @@ int cpu_detection(void) {
cr4 |= CR4_MCE; // enable machine check exceptions
//if (has_vmx())
// cr4 |= CR4_VMXE;
cr4 &= ~CR4_TSD; // => every privilege level is able to use rdtsc
cr4 &= ~(CR4_PCE|CR4_TSD); // disable performance monitoring counter
// clear TSD => every privilege level is able
// to use rdtsc
write_cr4(cr4);