Implement pmap changes suggested by alc@:

1. Move dirty bit emulation code that is duplicted for kernel and user
in trap.c to a function pmap_emulate_modified() in pmap.c.

2. While doing dirty bit emulation, it is not necessary to update the
TLB entry on all CPUs using smp_rendezvous(), we can just update the
TLB entry on the current CPU, and let the other CPUs update their TLB
entry lazily if they get an exception.

Reviewed by:	alc, neel

1 files changed, 1 insertions, 3 deletions

diff --git a/sys/mips/include/pmap.h b/sys/mips/include/pmap.h
index 4b3f69f..5432519 100644
--- a/sys/mips/include/pmap.h
+++ b/sys/mips/include/pmap.h
@@ -157,16 +157,14 @@ void pmap_bootstrap(void);
 void *pmap_mapdev(vm_offset_t, vm_size_t);
 void pmap_unmapdev(vm_offset_t, vm_size_t);
 vm_offset_t pmap_steal_memory(vm_size_t size);
-void pmap_set_modified(vm_offset_t pa);
 int page_is_managed(vm_offset_t pa);
 void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
 void pmap_kremove(vm_offset_t va);
 void *pmap_kenter_temporary(vm_paddr_t pa, int i);
 void pmap_kenter_temporary_free(vm_paddr_t pa);
 int pmap_compute_pages_to_dump(void);
-void pmap_update_page(pmap_t pmap, vm_offset_t va, pt_entry_t pte);
 void pmap_flush_pvcache(vm_page_t m);
-
+int pmap_emulate_modified(pmap_t pmap, vm_offset_t va);
 #endif				/* _KERNEL */
 
 #endif				/* !LOCORE */