Page MenuHomeFreeBSD
Differential D14029 Diff 38717 sys/amd64/amd64/initcpu.c

Changeset View

Standalone View

View Options

sys/amd64/amd64/initcpu.c

Show First 20 Lines • Show All 58 Lines • ▼ Show 20 Lines
* -1: automatic (default) * -1: automatic (default)
* 0: keep enable CLFLUSH * 0: keep enable CLFLUSH
* 1: force disable CLFLUSH * 1: force disable CLFLUSH
*/ */
static int hw_clflush_disable = -1; static int hw_clflush_disable = -1;
static void static void
init_amd(void) init_amd(void)
{ {
emasteUnsubmitted
Not Done
Inline Actions

Probably avoiding negative-sense tunables/sysctls is preferred (although we have clfush_disable just above, perhaps maintaining consistency is sensible)

emaste: Probably avoiding negative-sense tunables/sysctls is preferred (although we have clfush_disable…
uint64_t msr; uint64_t msr;
/* /*
* Work around Erratum 721 for Family 10h and 12h processors. * Work around Erratum 721 for Family 10h and 12h processors.
* These processors may incorrectly update the stack pointer * These processors may incorrectly update the stack pointer
* after a long series of push and/or near-call instructions, * after a long series of push and/or near-call instructions,
* or a long series of pop and/or near-return instructions. * or a long series of pop and/or near-return instructions.
* *
▲ Show 20 Lines • Show All 142 Lines • ▼ Show 20 Linesinitializecpu(void)
if (!IS_BSP() && (cpu_stdext_feature & CPUID_STDEXT_SMEP)) if (!IS_BSP() && (cpu_stdext_feature & CPUID_STDEXT_SMEP))
cr4 |= CR4_SMEP; cr4 |= CR4_SMEP;
load_cr4(cr4); load_cr4(cr4);
if ((amd_feature & AMDID_NX) != 0) { if ((amd_feature & AMDID_NX) != 0) {
msr = rdmsr(MSR_EFER) | EFER_NXE; msr = rdmsr(MSR_EFER) | EFER_NXE;
wrmsr(MSR_EFER, msr); wrmsr(MSR_EFER, msr);
pg_nx = PG_NX; pg_nx = PG_NX;
} }
hw_ibrs_recalculate();
switch (cpu_vendor_id) { switch (cpu_vendor_id) {
case CPU_VENDOR_AMD: case CPU_VENDOR_AMD:
init_amd(); init_amd();
break; break;
case CPU_VENDOR_CENTAUR: case CPU_VENDOR_CENTAUR:
init_via(); init_via();
break; break;
} }
Show All 34 Lines