SPARC64: SPARSEMEM_VMEMMAP support

[apw@shadowen.org: style fixups]
[apw@shadowen.org: vmemmap sparc64: convert to new config options]
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Christoph Lameter <clameter@sgi.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/ktlb.S b/arch/sparc64/kernel/ktlb.S
index d4024ac0d619..964527d2ffa0 100644
--- a/arch/sparc64/kernel/ktlb.S
+++ b/arch/sparc64/kernel/ktlb.S
@@ -226,6 +226,15 @@ kvmap_dtlb_load:
         ba,pt           %xcc, sun4v_dtlb_load
          mov            %g5, %g3
 
+kvmap_vmemmap:
+        sub             %g4, %g5, %g5
+        srlx            %g5, 22, %g5
+        sethi           %hi(vmemmap_table), %g1
+        sllx            %g5, 3, %g5
+        or              %g1, %lo(vmemmap_table), %g1
+        ba,pt           %xcc, kvmap_dtlb_load
+         ldx            [%g1 + %g5], %g5
+
 kvmap_dtlb_nonlinear:
         /* Catch kernel NULL pointer derefs.  */
         sethi           %hi(PAGE_SIZE), %g5
@@ -233,6 +242,13 @@ kvmap_dtlb_nonlinear:
         bleu,pn         %xcc, kvmap_dtlb_longpath
          nop
 
+        /* Do not use the TSB for vmemmap.  */
+        mov             (VMEMMAP_BASE >> 24), %g5
+        sllx            %g5, 24, %g5
+        cmp             %g4,%g5
+        bgeu,pn         %xcc, kvmap_vmemmap
+         nop
+
         KERN_TSB_LOOKUP_TL1(%g4, %g6, %g5, %g1, %g2, %g3, kvmap_dtlb_load)
 
 kvmap_dtlb_tsbmiss: