sh: fixed PMB mode refactoring.

This introduces some much overdue chainsawing of the fixed PMB support.
fixed PMB was introduced initially to work around the fact that dynamic
PMB mode was relatively broken, though they were never intended to
converge. The main areas where there are differences are whether the
system is booted in 29-bit mode or 32-bit mode, and whether legacy
mappings are to be preserved. Any system booting in true 32-bit mode will
not care about legacy mappings, so these are roughly decoupled.

Regardless of the entry point, PMB and 32BIT are directly related as far
as the kernel is concerned, so we also switch back to having one select
the other.

With legacy mappings iterated through and applied in the initialization
path it's now possible to finally merge the two implementations and
permit dynamic remapping overtop of remaining entries regardless of
whether boot mappings are crafted by hand or inherited from the boot
loader.

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

3 files changed, 10 insertions, 12 deletions

diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S
index 1151ecdffa71..e5d421db4c83 100644
--- a/arch/sh/kernel/head_32.S
+++ b/arch/sh/kernel/head_32.S
@@ -13,6 +13,8 @@
 #include <linux/init.h>
 #include <linux/linkage.h>
 #include <asm/thread_info.h>
+#include <asm/mmu.h>
+#include <cpu/mmu_context.h>
 
 #ifdef CONFIG_CPU_SH4A
 #define SYNCO()         synco
@@ -33,7 +35,7 @@ ENTRY(empty_zero_page)
         .long   1               /* LOADER_TYPE */
         .long   0x00000000      /* INITRD_START */
         .long   0x00000000      /* INITRD_SIZE */
-#if defined(CONFIG_32BIT) && defined(CONFIG_PMB_FIXED)
+#ifdef CONFIG_32BIT
         .long   0x53453f00 + 32 /* "SE?" = 32 bit */
 #else
         .long   0x53453f00 + 29 /* "SE?" = 29 bit */
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 8b0e69792cf4..f79ebe32a24a 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -455,10 +455,7 @@ void __init setup_arch(char **cmdline_p)
                 sh_mv.mv_setup(cmdline_p);
 
         paging_init();
-
-#ifdef CONFIG_PMB_ENABLE
         pmb_init();
-#endif
 
 #ifdef CONFIG_SMP
         plat_smp_setup();
diff --git a/arch/sh/kernel/vmlinux.lds.S b/arch/sh/kernel/vmlinux.lds.S
index a1e4ec24f1f5..9e5a5878eeae 100644
--- a/arch/sh/kernel/vmlinux.lds.S
+++ b/arch/sh/kernel/vmlinux.lds.S
@@ -14,17 +14,16 @@ OUTPUT_ARCH(sh)
 #include <asm/cache.h>
 #include <asm/vmlinux.lds.h>
 
+#if defined(CONFIG_32BIT) && !defined(CONFIG_PMB_LEGACY)
+#define MEMORY_OFFSET   0
+#else
+#define MEMORY_OFFSET   (CONFIG_MEMORY_START & 0x1fffffff)
+#endif
+
 ENTRY(_start)
 SECTIONS
 {
-#ifdef CONFIG_PMB_FIXED
-        . = CONFIG_PAGE_OFFSET + (CONFIG_MEMORY_START & 0x1fffffff) +
-            CONFIG_ZERO_PAGE_OFFSET;
-#elif defined(CONFIG_32BIT)
-        . = CONFIG_PAGE_OFFSET + CONFIG_ZERO_PAGE_OFFSET;
-#else
-        . = CONFIG_PAGE_OFFSET + CONFIG_MEMORY_START + CONFIG_ZERO_PAGE_OFFSET;
-#endif
+        . = CONFIG_PAGE_OFFSET + MEMORY_OFFSET + CONFIG_ZERO_PAGE_OFFSET;
 
         _text = .;              /* Text and read-only data */