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| author | kib <kib@FreeBSD.org> | 2010-03-10 15:50:38 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2010-03-10 15:50:38 +0000 |
| commit | 54e4314fe0f578875727207174797b971395b447 (patch) | |
| tree | f3ee90a4aa3e4a66a72b58c3545ea4407419efd5 /sys/i386 | |
| parent | 052dc599e82dc0ecdbea97786e7a62e3049e182b (diff) | |
| download | FreeBSD-src-54e4314fe0f578875727207174797b971395b447.zip FreeBSD-src-54e4314fe0f578875727207174797b971395b447.tar.gz | |
Fall back to wbinvd when region for CLFLUSH is >= 2MB.
Submitted by: Kevin Day <toasty dragondata com>
Reviewed by: jhb
MFC after: 2 weeks
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/i386/pmap.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c index 4b2e34f..f448071 100644 --- a/sys/i386/i386/pmap.c +++ b/sys/i386/i386/pmap.c @@ -996,7 +996,8 @@ pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva) if (cpu_feature & CPUID_SS) ; /* If "Self Snoop" is supported, do nothing. */ - else if (cpu_feature & CPUID_CLFSH) { + else if ((cpu_feature & CPUID_CLFSH) != 0 && + eva - sva < 2 * 1024 * 1024) { /* * Otherwise, do per-cache line flush. Use the mfence @@ -1013,7 +1014,8 @@ pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva) /* * No targeted cache flush methods are supported by CPU, - * globally invalidate cache as a last resort. + * or the supplied range is bigger then 2MB. + * Globally invalidate cache. */ pmap_invalidate_cache(); } |
