sh: Preparation for uncached jumps through PMB.

Presently most of the 29-bit physical parts do P1/P2 segmentation
with a 1:1 cached/uncached mapping, jumping between the two to
control the caching behaviour. This provides the basic infrastructure
to maintain this behaviour on 32-bit physical parts that don't map
P1/P2 at all, using a shiny new linker section and corresponding
fixmap entry.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/sh/kernel/vmlinux_32.lds.S b/arch/sh/kernel/vmlinux_32.lds.S
index 0956fb3681a3..50c69c18dced 100644
--- a/arch/sh/kernel/vmlinux_32.lds.S
+++ b/arch/sh/kernel/vmlinux_32.lds.S
@@ -43,6 +43,15 @@ SECTIONS
         NOTES
         RO_DATA(PAGE_SIZE)
 
+        /*
+         * Code which must be executed uncached and the associated data
+         */
+        . = ALIGN(PAGE_SIZE);
+        __uncached_start = .;
+        .uncached.text : { *(.uncached.text) }
+        .uncached.data : { *(.uncached.data) }
+        __uncached_end = .;
+
         . = ALIGN(THREAD_SIZE);
         .data : {                       /* Data */
                 *(.data.init_task)