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x86: Check for APIC presence only if DEV_ATPIC is defined

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We only attempt to gracefully handle absence of an APIC if "device
atpic" is defined in the kernel configuration.

Suggested by:	kib
Reviewed by:	jhb, kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mark Johnston 2021-12-28 17:42:12 -05:00
parent 254e4e5b77
commit deca0138dc
1 changed files with 4 additions and 0 deletions
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4
sys/x86/x86/local_apic.c
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@ -932,9 +932,11 @@ native_lapic_enable_pmc(void)
#ifdef HWPMC_HOOKS
u_int32_t maxlvt;
#ifdef DEV_ATPIC
/* Fail if the local APIC is not present. */
if (!x2apic_mode && lapic_map == NULL)
return (0);
#endif
/* Fail if the PMC LVT is not present. */
maxlvt = (lapic_read32(LAPIC_VERSION) & APIC_VER_MAXLVT) >> MAXLVTSHIFT;
@ -971,9 +973,11 @@ native_lapic_disable_pmc(void)
#ifdef HWPMC_HOOKS
u_int32_t maxlvt;
#ifdef DEV_ATPIC
/* Fail if the local APIC is not present. */
if (!x2apic_mode && lapic_map == NULL)
return;
#endif
/* Fail if the PMC LVT is not present. */
maxlvt = (lapic_read32(LAPIC_VERSION) & APIC_VER_MAXLVT) >> MAXLVTSHIFT;