Author: jhb Date: Thu Jan 17 21:32:25 2013 New Revision: 245577 URL: http://svnweb.freebsd.org/changeset/base/245577
Log: Don't attempt to use clflush on the local APIC register window. Various CPUs exhibit bad behavior if this is done (Intel Errata AAJ3, hangs on Pentium-M, and trashing of the local APIC registers on a VIA C7). The local APIC is implicitly mapped UC already via MTRRs, so the clflush isn't necessary anyway. MFC after: 2 weeks Modified: head/sys/amd64/amd64/pmap.c head/sys/i386/i386/pmap.c head/sys/x86/x86/local_apic.c Modified: head/sys/amd64/amd64/pmap.c ============================================================================== --- head/sys/amd64/amd64/pmap.c Thu Jan 17 21:32:03 2013 (r245576) +++ head/sys/amd64/amd64/pmap.c Thu Jan 17 21:32:25 2013 (r245577) @@ -1150,6 +1150,15 @@ pmap_invalidate_cache_range(vm_offset_t eva - sva < PMAP_CLFLUSH_THRESHOLD) { /* + * XXX: Some CPUs fault, hang, or trash the local APIC + * registers if we use CLFLUSH on the local APIC + * range. The local APIC is always uncached, so we + * don't need to flush for that range anyway. + */ + if (pmap_kextract(sva) == lapic_paddr) + return; + + /* * Otherwise, do per-cache line flush. Use the mfence * instruction to insure that previous stores are * included in the write-back. The processor Modified: head/sys/i386/i386/pmap.c ============================================================================== --- head/sys/i386/i386/pmap.c Thu Jan 17 21:32:03 2013 (r245576) +++ head/sys/i386/i386/pmap.c Thu Jan 17 21:32:25 2013 (r245577) @@ -96,6 +96,7 @@ __FBSDID("$FreeBSD$"); * and to when physical maps must be made correct. */ +#include "opt_apic.h" #include "opt_cpu.h" #include "opt_pmap.h" #include "opt_smp.h" @@ -1175,6 +1176,16 @@ pmap_invalidate_cache_range(vm_offset_t else if ((cpu_feature & CPUID_CLFSH) != 0 && eva - sva < PMAP_CLFLUSH_THRESHOLD) { +#ifdef DEV_APIC + /* + * XXX: Some CPUs fault, hang, or trash the local APIC + * registers if we use CLFLUSH on the local APIC + * range. The local APIC is always uncached, so we + * don't need to flush for that range anyway. + */ + if (pmap_kextract(sva) == lapic_paddr) + return; +#endif /* * Otherwise, do per-cache line flush. Use the mfence * instruction to insure that previous stores are Modified: head/sys/x86/x86/local_apic.c ============================================================================== --- head/sys/x86/x86/local_apic.c Thu Jan 17 21:32:03 2013 (r245576) +++ head/sys/x86/x86/local_apic.c Thu Jan 17 21:32:25 2013 (r245577) @@ -227,8 +227,8 @@ lapic_init(vm_paddr_t addr) /* Map the local APIC and setup the spurious interrupt handler. */ KASSERT(trunc_page(addr) == addr, ("local APIC not aligned on a page boundary")); - lapic = pmap_mapdev(addr, sizeof(lapic_t)); lapic_paddr = addr; + lapic = pmap_mapdev(addr, sizeof(lapic_t)); setidt(APIC_SPURIOUS_INT, IDTVEC(spuriousint), SDT_APIC, SEL_KPL, GSEL_APIC); _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"