- Currently the PMAP code is laid out to let the kernel TSB cover the

  whole KVA space using one locked 4MB dTLB entry per GB of physical
  memory. On Cheetah-class machines only the dt16 can hold locked
  entries though, which would be completely consumed for the kernel
  TSB on machines with >= 16GB. Therefore limit the KVA space to use
  no more than half of the lockable dTLB slots, given that we need
  them also for other things.
- Add sanity checks which ensure that we don't exhaust the (lockable)
  TLB slots.

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/sparc64/include/tlb.h b/sys/sparc64/include/tlb.h
index 06a8296..f0a4a7b 100644
--- a/sys/sparc64/include/tlb.h
+++ b/sys/sparc64/include/tlb.h
@@ -129,6 +129,8 @@ typedef void tlb_flush_user_t(void);
 struct pmap;
 struct tlb_entry;
 
+extern int dtlb_slots;
+extern int itlb_slots;
 extern int kernel_tlb_slots;
 extern struct tlb_entry *kernel_tlbs;