view .hgtags @ 8908:f94931b07c67

[IA64] tlb miss fix

make dtlb miss handler to handle xen/ia64 identity mapping area.
xen/ia64 enables vhpt walker for all regions unlink Linux.
So dtlb misses on identity mapping area are catched by
dtlb miss handler, not alt dltb miss handler.

- dtlb miss on identity mapping area must be handled
- alt dtlb miss must be handled
- itlb miss on the identity mapping area must not occur
panic via page_fault().
- alt itlb miss by a guest must be handled
it occurs during dom0 boot.
- alt itlb miss by xen must not occur
panic by FORCE_CRASH

vmx_ivt.S already has such tweaks by checking psr.vm bit.

TODO: optimization
dtlb miss handlers are performance critical so that
it should be heavily optimized like alt_dtlb_miss.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author awilliam@xenbuild.aw
date Fri Feb 24 08:34:11 2006 -0700 (2006-02-24)
parents 7729efa06812
children 11fee62328cc
line source
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