sh: Track the uncached mapping size.

This provides a variable for tracking the uncached mapping size, and uses
it for pretty printing the uncached lowmem range. Beyond this, we'll also
be building on top of this for figuring out from where the remainder of
P2 becomes usable when constructing unrelated mappings.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S
index e93320135cda..83f2b84b58da 100644
--- a/arch/sh/kernel/head_32.S
+++ b/arch/sh/kernel/head_32.S
@@ -217,11 +217,18 @@ ENTRY(_stext)
         __PMB_ITER_BY_SIZE(16)
 
         /*
-         * Now that we can access it, update cached_to_uncached.
+         * Now that we can access it, update cached_to_uncached and
+         * uncached_size.
          */
         mov.l   .Lcached_to_uncached, r0
         mov.l   r7, @r0
 
+        mov.l   .Luncached_size, r0
+        mov     #1, r7
+        shll16  r7
+        shll8   r7
+        mov.l   r7, @r0
+
         /*
          * Clear the remaining PMB entries.
          *
@@ -300,5 +307,6 @@ ENTRY(stack_start)
 .LFIRST_DATA_ENTRY:     .long   __MEMORY_START | PMB_V
 .LMMUCR:                .long   MMUCR
 .Lcached_to_uncached:   .long   cached_to_uncached
+.Luncached_size:        .long   uncached_size
 .LMEMORY_SIZE:          .long   __MEMORY_SIZE
 #endif