[SPARC64]: Fix two bugs wrt. kernel 4MB TSB.

1) The TSB lookup was not using the correct hash mask.

2) It was not aligned on a boundary equal to it's size,
   which is required by the sun4v Hypervisor.

wasn't having it's return value checked, and that bug will be fixed up
as well in a subsequent changeset.

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

2 files changed, 30 insertions, 6 deletions

diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S
index 5c11529742d4..77259526cb15 100644
--- a/arch/sparc64/kernel/head.S
+++ b/arch/sparc64/kernel/head.S
@@ -653,33 +653,54 @@ setup_tba:
          restore
 sparc64_boot_end:
 
-#include "ktlb.S"
-#include "tsb.S"
 #include "etrap.S"
 #include "rtrap.S"
 #include "winfixup.S"
 #include "entry.S"
 #include "sun4v_tlb_miss.S"
 #include "sun4v_ivec.S"
+#include "ktlb.S"
+#include "tsb.S"
 
 /*
  * The following skip makes sure the trap table in ttable.S is aligned
  * on a 32K boundary as required by the v9 specs for TBA register.
  *
  * We align to a 32K boundary, then we have the 32K kernel TSB,
- * then the 32K aligned trap table.
+ * the 64K kernel 4MB TSB, and then the 32K aligned trap table.
  */
 1:
         .skip   0x4000 + _start - 1b
 
+! 0x0000000000408000
+
         .globl  swapper_tsb
 swapper_tsb:
         .skip   (32 * 1024)
 
-! 0x0000000000408000
+        .globl  swapper_4m_tsb
+swapper_4m_tsb:
+        .skip   (64 * 1024)
+
+! 0x0000000000420000
 
+        /* Some care needs to be exercised if you try to move the
+         * location of the trap table relative to other things.  For
+         * one thing there are br* instructions in some of the
+         * trap table entires which branch back to code in ktlb.S
+         * Those instructions can only handle a signed 16-bit
+         * displacement.
+         *
+         * There is a binutils bug (bugzilla #4558) which causes
+         * the relocation overflow checks for such instructions to
+         * not be done correctly.  So bintuils will not notice the
+         * error and will instead write junk into the relocation and
+         * you'll have an unbootable kernel.
+         */
 #include "ttable.S"
 
+! 0x0000000000428000
+
 #include "systbls.S"
 
         .data
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 087cbf09d0b7..97af4311f787 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -61,8 +61,11 @@ unsigned long kern_linear_pte_xor[2] __read_mostly;
 unsigned long kpte_linear_bitmap[KPTE_BITMAP_BYTES / sizeof(unsigned long)];
 
 #ifndef CONFIG_DEBUG_PAGEALLOC
-/* A special kernel TSB for 4MB and 256MB linear mappings.  */
-struct tsb swapper_4m_tsb[KERNEL_TSB4M_NENTRIES];
+/* A special kernel TSB for 4MB and 256MB linear mappings.
+ * Space is allocated for this right after the trap table
+ * in arch/sparc64/kernel/head.S
+ */
+extern struct tsb swapper_4m_tsb[KERNEL_TSB4M_NENTRIES];
 #endif
 
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