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Fall back to wbinvd when region for CLFLUSH is >= 2MB.

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Submitted by:	Kevin Day <toasty dragondata com>
Reviewed by:	jhb
MFC after:	2 weeks
This commit is contained in:
Konstantin Belousov 2010-03-10 15:50:38 +00:00
parent 33962e6d47
commit 2a595a404f
2 changed files with 8 additions and 4 deletions
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6
sys/amd64/amd64/pmap.c
View file

@ -1105,7 +1105,8 @@ 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
@ -1122,7 +1123,8 @@ 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();
}

6
sys/i386/i386/pmap.c
View file

@ -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();
}