1 files changed, 166 insertions, 0 deletions

diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
new file mode 100644
index 000000000000..0b604f0f192d
--- /dev/null
+++ b/arch/m68k/include/asm/pgtable_mm.h
@@ -0,0 +1,166 @@
+#ifndef _M68K_PGTABLE_H
+#define _M68K_PGTABLE_H
+
+#include <asm-generic/4level-fixup.h>
+
+#include <asm/setup.h>
+
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>
+#include <linux/sched.h>
+#include <linux/threads.h>
+
+/*
+ * This file contains the functions and defines necessary to modify and use
+ * the m68k page table tree.
+ */
+
+#include <asm/virtconvert.h>
+
+/* Certain architectures need to do special things when pte's
+ * within a page table are directly modified.  Thus, the following
+ * hook is made available.
+ */
+#define set_pte(pteptr, pteval)                                 \
+        do{                                                     \
+                *(pteptr) = (pteval);                           \
+        } while(0)
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+
+/* PMD_SHIFT determines the size of the area a second-level page table can map */
+#ifdef CONFIG_SUN3
+#define PMD_SHIFT       17
+#else
+#define PMD_SHIFT       22
+#endif
+#define PMD_SIZE        (1UL << PMD_SHIFT)
+#define PMD_MASK        (~(PMD_SIZE-1))
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#ifdef CONFIG_SUN3
+#define PGDIR_SHIFT     17
+#else
+#define PGDIR_SHIFT     25
+#endif
+#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE-1))
+
+/*
+ * entries per page directory level: the m68k is configured as three-level,
+ * so we do have PMD level physically.
+ */
+#ifdef CONFIG_SUN3
+#define PTRS_PER_PTE   16
+#define PTRS_PER_PMD   1
+#define PTRS_PER_PGD   2048
+#else
+#define PTRS_PER_PTE    1024
+#define PTRS_PER_PMD    8
+#define PTRS_PER_PGD    128
+#endif
+#define USER_PTRS_PER_PGD       (TASK_SIZE/PGDIR_SIZE)
+#define FIRST_USER_ADDRESS      0
+
+/* Virtual address region for use by kernel_map() */
+#ifdef CONFIG_SUN3
+#define KMAP_START     0x0DC00000
+#define KMAP_END       0x0E000000
+#else
+#define KMAP_START      0xd0000000
+#define KMAP_END        0xf0000000
+#endif
+
+#ifndef CONFIG_SUN3
+/* 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
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ */
+#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 vmalloc_end;
+#define VMALLOC_START 0x0f800000
+#define VMALLOC_END vmalloc_end
+#endif /* CONFIG_SUN3 */
+
+/* zero page used for uninitialized stuff */
+extern void *empty_zero_page;
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+#define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))
+
+/* number of bits that fit into a memory pointer */
+#define BITS_PER_PTR                    (8*sizeof(unsigned long))
+
+/* to align the pointer to a pointer address */
+#define PTR_MASK                        (~(sizeof(void*)-1))
+
+/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
+/* 64-bit machines, beware!  SRB. */
+#define SIZEOF_PTR_LOG2                        2
+
+extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);
+
+/*
+ * The m68k doesn't have any external MMU info: the kernel page
+ * tables contain all the necessary information.  The Sun3 does, but
+ * they are updated on demand.
+ */
+static inline void update_mmu_cache(struct vm_area_struct *vma,
+                                    unsigned long address, pte_t pte)
+{
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#define kern_addr_valid(addr)   (1)
+
+#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
+                remap_pfn_range(vma, vaddr, pfn, size, prot)
+
+/* MMU-specific headers */
+
+#ifdef CONFIG_SUN3
+#include <asm/sun3_pgtable.h>
+#else
+#include <asm/motorola_pgtable.h>
+#endif
+
+#ifndef __ASSEMBLY__
+#include <asm-generic/pgtable.h>
+
+/*
+ * Macro to mark a page protection value as "uncacheable".
+ */
+#ifdef SUN3_PAGE_NOCACHE
+# define __SUN3_PAGE_NOCACHE    SUN3_PAGE_NOCACHE
+#else
+# define __SUN3_PAGE_NOCACHE    0
+#endif
+#define pgprot_noncached(prot)                                                  \
+        (MMU_IS_SUN3                                                            \
+         ? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE))                   \
+         : ((MMU_IS_851 || MMU_IS_030)                                          \
+            ? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030))                   \
+            : (MMU_IS_040 || MMU_IS_060)                                        \
+            ? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S))  \
+            : (prot)))
+
+#endif /* !__ASSEMBLY__ */
+
+/*
+ * No page table caches to initialise
+ */
+#define pgtable_cache_init()    do { } while (0)
+
+#define check_pgt_cache()       do { } while (0)
+
+#endif /* _M68K_PGTABLE_H */