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Assume Always Running APIC Timer for AMD CPU families >= 0x12.

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Fallback to HPET may cause locks congestions on many-core systems.
This change replicates Linux behavior.

MFC after:	1 month
This commit is contained in:
Alexander Motin 2018-01-28 18:18:03 +00:00
parent 48d95fd235
commit a5232cc4fb
1 changed files with 3 additions and 0 deletions
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3
sys/x86/x86/local_apic.c
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@ -526,6 +526,9 @@ native_lapic_init(vm_paddr_t addr)
do_cpuid(0x06, regs);
if ((regs[0] & CPUTPM1_ARAT) != 0)
arat = 1;
} else if (cpu_vendor_id == CPU_VENDOR_AMD &&
CPUID_TO_FAMILY(cpu_id) >= 0x12) {
arat = 1;
}
bzero(&lapic_et, sizeof(lapic_et));
lapic_et.et_name = "LAPIC";