[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, 3 insertions, 5 deletions

diff --git a/arch/sparc64/kernel/winfixup.S b/arch/sparc64/kernel/winfixup.S
index 39160926267b..f5d93aa99cbb 100644
--- a/arch/sparc64/kernel/winfixup.S
+++ b/arch/sparc64/kernel/winfixup.S
@@ -85,6 +85,7 @@ fill_fixup:
         mov             %o7, %g6
         ldx             [%g6 + TI_TASK], %g4
 #ifdef CONFIG_SMP
+#error IMMU TSB usage must be fixed
         mov             TSB_REG, %g1
         ldxa            [%g1] ASI_IMMU, %g5
 #endif
@@ -209,6 +210,7 @@ fill_fixup_mna:
         mov             %o7, %g6                        ! Get current back.
         ldx             [%g6 + TI_TASK], %g4            ! Finish it.
 #ifdef CONFIG_SMP
+#error IMMU TSB usage must be fixed
         mov             TSB_REG, %g1
         ldxa            [%g1] ASI_IMMU, %g5
 #endif
@@ -278,11 +280,6 @@ window_mna_from_user_common:
         ba,pt           %xcc, rtrap
          clr            %l6
         
-        /* These are only needed for 64-bit mode processes which
-         * put their stack pointer into the VPTE area and there
-         * happens to be a VPTE tlb entry mapped there during
-         * a spill/fill trap to that stack frame.
-         */
         .globl          winfix_dax, fill_fixup_dax, spill_fixup_dax
 winfix_dax:
         andn            %g3, 0x7f, %g3
@@ -318,6 +315,7 @@ fill_fixup_dax:
         mov             %o7, %g6                        ! Get current back.
         ldx             [%g6 + TI_TASK], %g4            ! Finish it.
 #ifdef CONFIG_SMP
+#error IMMU TSB usage must be fixed
         mov             TSB_REG, %g1
         ldxa            [%g1] ASI_IMMU, %g5
 #endif