[SPARC64]: Move away from virtual page tables, part 1.

We now use the TSB hardware assist features of the UltraSPARC
MMUs.

SMP is currently knowingly broken, we need to find another place
to store the per-cpu base pointers.  We hid them away in the TSB
base register, and that obviously will not work any more :-)

Another known broken case is non-8KB base page size.

Also noticed that flush_tlb_all() is not referenced anywhere, only
the internal __flush_tlb_all() (local cpu only) is used by the
sparc64 port, so we can get rid of flush_tlb_all().

The kernel gets it's own 8KB TSB (swapper_tsb) and each address space
gets it's own private 8K TSB.  Later we can add code to dynamically
increase the size of per-process TSB as the RSS grows.  An 8KB TSB is
good enough for up to about a 4MB RSS, after which the TSB starts to
incur many capacity and conflict misses.

We even accumulate OBP translations into the kernel TSB.

Another area for refinement is large page size support.  We could use
a secondary address space TSB to handle those.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 12 deletions

diff --git a/include/asm-sparc64/processor.h b/include/asm-sparc64/processor.h
index cd8d9b4c8658..b3889f3f943a 100644
--- a/include/asm-sparc64/processor.h
+++ b/include/asm-sparc64/processor.h
@@ -28,6 +28,8 @@
  * User lives in his very own context, and cannot reference us. Note
  * that TASK_SIZE is a misnomer, it really gives maximum user virtual 
  * address that the kernel will allocate out.
+ *
+ * XXX No longer using virtual page tables, kill this upper limit...
  */
 #define VA_BITS         44
 #ifndef __ASSEMBLY__
@@ -37,18 +39,6 @@
 #endif
 #define TASK_SIZE       ((unsigned long)-VPTE_SIZE)
 
-/*
- * The vpte base must be able to hold the entire vpte, half
- * of which lives above, and half below, the base. And it
- * is placed as close to the highest address range as possible.
- */
-#define VPTE_BASE_SPITFIRE      (-(VPTE_SIZE/2))
-#if 1
-#define VPTE_BASE_CHEETAH       VPTE_BASE_SPITFIRE
-#else
-#define VPTE_BASE_CHEETAH       0xffe0000000000000
-#endif
-
 #ifndef __ASSEMBLY__
 
 typedef struct {