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>
diff --git a/arch/sh/kernel/cpu/init.c b/arch/sh/kernel/cpu/init.c
index fd1688e6..0f0c76a 100644
--- a/arch/sh/kernel/cpu/init.c
+++ b/arch/sh/kernel/cpu/init.c
@@ -64,11 +64,11 @@
* Generic first-level cache init
*/
#ifdef CONFIG_SUPERH32
-static void __init cache_init(void)
+static void __uses_jump_to_uncached cache_init(void)
{
unsigned long ccr, flags;
- jump_to_P2();
+ jump_to_uncached();
ccr = ctrl_inl(CCR);
/*
@@ -145,7 +145,7 @@
#endif
ctrl_outl(flags, CCR);
- back_to_P1();
+ back_to_cached();
}
#else
#define cache_init() do { } while (0)
diff --git a/arch/sh/kernel/cpu/sh3/probe.c b/arch/sh/kernel/cpu/sh3/probe.c
index bf579e0..22070e4 100644
--- a/arch/sh/kernel/cpu/sh3/probe.c
+++ b/arch/sh/kernel/cpu/sh3/probe.c
@@ -16,11 +16,11 @@
#include <asm/cache.h>
#include <asm/io.h>
-int __init detect_cpu_and_cache_system(void)
+int __uses_jump_to_uncached detect_cpu_and_cache_system(void)
{
unsigned long addr0, addr1, data0, data1, data2, data3;
- jump_to_P2();
+ jump_to_uncached();
/*
* Check if the entry shadows or not.
* When shadowed, it's 128-entry system.
@@ -48,7 +48,7 @@
ctrl_outl(data0&~SH_CACHE_VALID, addr0);
ctrl_outl(data2&~SH_CACHE_VALID, addr1);
- back_to_P1();
+ back_to_cached();
boot_cpu_data.dcache.ways = 4;
boot_cpu_data.dcache.entry_shift = 4;
diff --git a/arch/sh/kernel/vmlinux_32.lds.S b/arch/sh/kernel/vmlinux_32.lds.S
index 0956fb3..50c69c1 100644
--- a/arch/sh/kernel/vmlinux_32.lds.S
+++ b/arch/sh/kernel/vmlinux_32.lds.S
@@ -43,6 +43,15 @@
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)