1 files changed, 291 insertions, 0 deletions

diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h
new file mode 100644
index 000000000000..8e9a8a754dde
--- /dev/null
+++ b/arch/m68k/include/asm/motorola_pgtable.h
@@ -0,0 +1,291 @@
+#ifndef _MOTOROLA_PGTABLE_H
+#define _MOTOROLA_PGTABLE_H
+
+
+/*
+ * Definitions for MMU descriptors
+ */
+#define _PAGE_PRESENT   0x001
+#define _PAGE_SHORT     0x002
+#define _PAGE_RONLY     0x004
+#define _PAGE_ACCESSED  0x008
+#define _PAGE_DIRTY     0x010
+#define _PAGE_SUPER     0x080   /* 68040 supervisor only */
+#define _PAGE_GLOBAL040 0x400   /* 68040 global bit, used for kva descs */
+#define _PAGE_NOCACHE030 0x040  /* 68030 no-cache mode */
+#define _PAGE_NOCACHE   0x060   /* 68040 cache mode, non-serialized */
+#define _PAGE_NOCACHE_S 0x040   /* 68040 no-cache mode, serialized */
+#define _PAGE_CACHE040  0x020   /* 68040 cache mode, cachable, copyback */
+#define _PAGE_CACHE040W 0x000   /* 68040 cache mode, cachable, write-through */
+
+#define _DESCTYPE_MASK  0x003
+
+#define _CACHEMASK040   (~0x060)
+#define _TABLE_MASK     (0xfffffe00)
+
+#define _PAGE_TABLE     (_PAGE_SHORT)
+#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
+
+#define _PAGE_PROTNONE  0x004
+#define _PAGE_FILE      0x008   /* pagecache or swap? */
+
+#ifndef __ASSEMBLY__
+
+/* This is the cache mode to be used for pages containing page descriptors for
+ * processors >= '040. It is in pte_mknocache(), and the variable is defined
+ * and initialized in head.S */
+extern int m68k_pgtable_cachemode;
+
+/* This is the cache mode for normal pages, for supervisor access on
+ * processors >= '040. It is used in pte_mkcache(), and the variable is
+ * defined and initialized in head.S */
+
+#if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
+#define m68k_supervisor_cachemode _PAGE_CACHE040W
+#elif defined(CPU_M68040_OR_M68060_ONLY)
+#define m68k_supervisor_cachemode _PAGE_CACHE040
+#elif defined(CPU_M68020_OR_M68030_ONLY)
+#define m68k_supervisor_cachemode 0
+#else
+extern int m68k_supervisor_cachemode;
+#endif
+
+#if defined(CPU_M68040_OR_M68060_ONLY)
+#define mm_cachebits _PAGE_CACHE040
+#elif defined(CPU_M68020_OR_M68030_ONLY)
+#define mm_cachebits 0
+#else
+extern unsigned long mm_cachebits;
+#endif
+
+#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
+#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
+#define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
+#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
+#define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
+
+/* Alternate definitions that are compile time constants, for
+   initializing protection_map.  The cachebits are fixed later.  */
+#define PAGE_NONE_C     __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
+#define PAGE_SHARED_C   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
+#define PAGE_COPY_C     __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
+#define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
+
+/*
+ * The m68k can't do page protection for execute, and considers that the same are read.
+ * Also, write permissions imply read permissions. This is the closest we can get..
+ */
+#define __P000  PAGE_NONE_C
+#define __P001  PAGE_READONLY_C
+#define __P010  PAGE_COPY_C
+#define __P011  PAGE_COPY_C
+#define __P100  PAGE_READONLY_C
+#define __P101  PAGE_READONLY_C
+#define __P110  PAGE_COPY_C
+#define __P111  PAGE_COPY_C
+
+#define __S000  PAGE_NONE_C
+#define __S001  PAGE_READONLY_C
+#define __S010  PAGE_SHARED_C
+#define __S011  PAGE_SHARED_C
+#define __S100  PAGE_READONLY_C
+#define __S101  PAGE_READONLY_C
+#define __S110  PAGE_SHARED_C
+#define __S111  PAGE_SHARED_C
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+        pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
+        return pte;
+}
+
+static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
+{
+        unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
+        unsigned long *ptr = pmdp->pmd;
+        short i = 16;
+        while (--i >= 0) {
+                *ptr++ = ptbl;
+                ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
+        }
+}
+
+static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
+{
+        pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
+}
+
+#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
+#define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
+#define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
+
+
+#define pte_none(pte)           (!pte_val(pte))
+#define pte_present(pte)        (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
+#define pte_clear(mm,addr,ptep)         ({ pte_val(*(ptep)) = 0; })
+
+#define pte_page(pte)           virt_to_page(__va(pte_val(pte)))
+#define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
+#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+
+#define pmd_none(pmd)           (!pmd_val(pmd))
+#define pmd_bad(pmd)            ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
+#define pmd_present(pmd)        (pmd_val(pmd) & _PAGE_TABLE)
+#define pmd_clear(pmdp) ({                      \
+        unsigned long *__ptr = pmdp->pmd;       \
+        short __i = 16;                         \
+        while (--__i >= 0)                      \
+                *__ptr++ = 0;                   \
+})
+#define pmd_page(pmd)           virt_to_page(__va(pmd_val(pmd)))
+
+
+#define pgd_none(pgd)           (!pgd_val(pgd))
+#define pgd_bad(pgd)            ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
+#define pgd_present(pgd)        (pgd_val(pgd) & _PAGE_TABLE)
+#define pgd_clear(pgdp)         ({ pgd_val(*pgdp) = 0; })
+#define pgd_page(pgd)           (mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))
+
+#define pte_ERROR(e) \
+        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
+#define pmd_ERROR(e) \
+        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
+#define pgd_ERROR(e) \
+        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_write(pte_t pte)          { return !(pte_val(pte) & _PAGE_RONLY); }
+static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
+static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
+static inline int pte_file(pte_t pte)           { return pte_val(pte) & _PAGE_FILE; }
+static inline int pte_special(pte_t pte)        { return 0; }
+
+static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) |= _PAGE_RONLY; return pte; }
+static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
+static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
+static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
+static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
+static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
+static inline pte_t pte_mknocache(pte_t pte)
+{
+        pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
+        return pte;
+}
+static inline pte_t pte_mkcache(pte_t pte)
+{
+        pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
+        return pte;
+}
+static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
+
+#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
+
+#define pgd_index(address)     ((address) >> PGDIR_SHIFT)
+
+/* to find an entry in a page-table-directory */
+static inline pgd_t *pgd_offset(const struct mm_struct *mm,
+                                unsigned long address)
+{
+        return mm->pgd + pgd_index(address);
+}
+
+#define swapper_pg_dir kernel_pg_dir
+extern pgd_t kernel_pg_dir[128];
+
+static inline pgd_t *pgd_offset_k(unsigned long address)
+{
+        return kernel_pg_dir + (address >> PGDIR_SHIFT);
+}
+
+
+/* Find an entry in the second-level page table.. */
+static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
+{
+        return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
+}
+
+/* Find an entry in the third-level page table.. */
+static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address)
+{
+        return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
+}
+
+#define pte_offset_map(pmdp,address) ((pte_t *)__pmd_page(*pmdp) + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
+#define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address)
+#define pte_unmap(pte)          ((void)0)
+#define pte_unmap_nested(pte)   ((void)0)
+
+/*
+ * Allocate and free page tables. The xxx_kernel() versions are
+ * used to allocate a kernel page table - this turns on ASN bits
+ * if any.
+ */
+
+/* Prior to calling these routines, the page should have been flushed
+ * from both the cache and ATC, or the CPU might not notice that the
+ * cache setting for the page has been changed. -jskov
+ */
+static inline void nocache_page(void *vaddr)
+{
+        unsigned long addr = (unsigned long)vaddr;
+
+        if (CPU_IS_040_OR_060) {
+                pgd_t *dir;
+                pmd_t *pmdp;
+                pte_t *ptep;
+
+                dir = pgd_offset_k(addr);
+                pmdp = pmd_offset(dir, addr);
+                ptep = pte_offset_kernel(pmdp, addr);
+                *ptep = pte_mknocache(*ptep);
+        }
+}
+
+static inline void cache_page(void *vaddr)
+{
+        unsigned long addr = (unsigned long)vaddr;
+
+        if (CPU_IS_040_OR_060) {
+                pgd_t *dir;
+                pmd_t *pmdp;
+                pte_t *ptep;
+
+                dir = pgd_offset_k(addr);
+                pmdp = pmd_offset(dir, addr);
+                ptep = pte_offset_kernel(pmdp, addr);
+                *ptep = pte_mkcache(*ptep);
+        }
+}
+
+#define PTE_FILE_MAX_BITS       28
+
+static inline unsigned long pte_to_pgoff(pte_t pte)
+{
+        return pte.pte >> 4;
+}
+
+static inline pte_t pgoff_to_pte(unsigned off)
+{
+        pte_t pte = { (off << 4) + _PAGE_FILE };
+        return pte;
+}
+
+/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
+#define __swp_type(x)           (((x).val >> 4) & 0xff)
+#define __swp_offset(x)         ((x).val >> 12)
+#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
+#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
+
+#endif  /* !__ASSEMBLY__ */
+#endif /* _MOTOROLA_PGTABLE_H */