[PATCH 12/35] m68k: add page table size definitions for ColdFire V4e MMU

gerg
2011-12-16T12:36:47Z

Define the page table size and attributes for the ColdFire V4e MMU.
Also setup the vmalloc and kmap regions we will use.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Matt Waddel <mwaddel@yahoo.com>
Acked-by: Kurt Mahan <kmahan@xmission.com>
---
arch/m68k/include/asm/pgtable_mm.h | 30 ++++++++++++++++++++++++------
1 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
index 87174c9..dc35e0e 100644
--- a/arch/m68k/include/asm/pgtable_mm.h
+++ b/arch/m68k/include/asm/pgtable_mm.h
@@ -40,6 +40,8 @@
/* PGDIR_SHIFT determines what a third-level page table entry can map */
#ifdef CONFIG_SUN3
#define PGDIR_SHIFT 17
+#elif defined(CONFIG_COLDFIRE)
+#define PGDIR_SHIFT 22
#else
#define PGDIR_SHIFT 25
#endif
@@ -54,6 +56,10 @@
#define PTRS_PER_PTE 16
#define PTRS_PER_PMD 1
#define PTRS_PER_PGD 2048
+#elif defined(CONFIG_COLDFIRE)
+#define PTRS_PER_PTE 512
+#define PTRS_PER_PMD 1
+#define PTRS_PER_PGD 1024
#else
#define PTRS_PER_PTE 1024
#define PTRS_PER_PMD 8
@@ -66,12 +72,22 @@
#ifdef CONFIG_SUN3
#define KMAP_START 0x0DC00000
#define KMAP_END 0x0E000000
+#elif defined(CONFIG_COLDFIRE)
+#define KMAP_START 0xe0000000
+#define KMAP_END 0xf0000000
#else
#define KMAP_START 0xd0000000
#define KMAP_END 0xf0000000
#endif

-#ifndef CONFIG_SUN3
+#ifdef CONFIG_SUN3
+extern unsigned long m68k_vmalloc_end;
+#define VMALLOC_START 0x0f800000
+#define VMALLOC_END m68k_vmalloc_end
+#elif defined(CONFIG_COLDFIRE)
+#define VMALLOC_START 0xd0000000
+#define VMALLOC_END 0xe0000000
+#else
/* Just any arbitrary offset to the start of the vmalloc VM area: the
* current 8MB value just means that there will be a 8MB "hole" after the
* physical memory until the kernel virtual memory starts. That means that
@@ -82,11 +98,7 @@
#define VMALLOC_OFFSET (8*1024*1024)
#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
#define VMALLOC_END KMAP_START
-#else
-extern unsigned long m68k_vmalloc_end;
-#define VMALLOC_START 0x0f800000
-#define VMALLOC_END m68k_vmalloc_end
-#endif /* CONFIG_SUN3 */
+#endif

/* zero page used for uninitialized stuff */
extern void *empty_zero_page;
@@ -130,6 +142,8 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,

#ifdef CONFIG_SUN3
#include <asm/sun3_pgtable.h>
+#elif defined(CONFIG_COLDFIRE)
+#include <asm/mcf_pgtable.h>
#else
#include <asm/motorola_pgtable.h>
#endif
@@ -138,6 +152,9 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
/*
* Macro to mark a page protection value as "uncacheable".
*/
+#ifdef CONFIG_COLDFIRE
+# define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | CF_PAGE_NOCACHE))
+#else
#ifdef SUN3_PAGE_NOCACHE
# define __SUN3_PAGE_NOCACHE SUN3_PAGE_NOCACHE
#else
@@ -152,6 +169,7 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S)) \
: (prot)))

+#endif /* CONFIG_COLDFIRE */
#include <asm-generic/pgtable.h>
#endif /* !__ASSEMBLY__ */

--
1.7.0.4