1 files changed, 234 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
new file mode 100644
index 000000000000..f847ec732d62
--- /dev/null
+++ b/arch/m68k/include/asm/sun3_pgtable.h
@@ -0,0 +1,234 @@
+#ifndef _SUN3_PGTABLE_H
+#define _SUN3_PGTABLE_H
+
+#include <asm/sun3mmu.h>
+
+#ifndef __ASSEMBLY__
+#include <asm/virtconvert.h>
+#include <linux/linkage.h>
+
+/*
+ * This file contains all the things which change drastically for the sun3
+ * pagetable stuff, to avoid making too much of a mess of the generic m68k
+ * `pgtable.h'; this should only be included from the generic file. --m
+ */
+
+/* For virtual address to physical address conversion */
+#define VTOP(addr)	__pa(addr)
+#define PTOV(addr)	__va(addr)
+
+
+#endif	/* !__ASSEMBLY__ */
+
+/* These need to be defined for compatibility although the sun3 doesn't use them */
+#define _PAGE_NOCACHE030 0x040
+#define _CACHEMASK040   (~0x060)
+#define _PAGE_NOCACHE_S 0x040
+
+/* Page protection values within PTE. */
+#define SUN3_PAGE_VALID     (0x80000000)
+#define SUN3_PAGE_WRITEABLE (0x40000000)
+#define SUN3_PAGE_SYSTEM    (0x20000000)
+#define SUN3_PAGE_NOCACHE   (0x10000000)
+#define SUN3_PAGE_ACCESSED  (0x02000000)
+#define SUN3_PAGE_MODIFIED  (0x01000000)
+
+
+/* Externally used page protection values. */
+#define _PAGE_PRESENT	(SUN3_PAGE_VALID)
+#define _PAGE_ACCESSED	(SUN3_PAGE_ACCESSED)
+
+#define PTE_FILE_MAX_BITS 28
+
+/* Compound page protection values. */
+//todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix...
+// is it just PAGE_KERNEL and PAGE_SHARED?
+#define PAGE_NONE	__pgprot(SUN3_PAGE_VALID \
+				 | SUN3_PAGE_ACCESSED \
+				 | SUN3_PAGE_NOCACHE)
+#define PAGE_SHARED	__pgprot(SUN3_PAGE_VALID \
+				 | SUN3_PAGE_WRITEABLE \
+				 | SUN3_PAGE_ACCESSED \
+				 | SUN3_PAGE_NOCACHE)
+#define PAGE_COPY	__pgprot(SUN3_PAGE_VALID \
+				 | SUN3_PAGE_ACCESSED \
+				 | SUN3_PAGE_NOCACHE)
+#define PAGE_READONLY	__pgprot(SUN3_PAGE_VALID \
+				 | SUN3_PAGE_ACCESSED \
+				 | SUN3_PAGE_NOCACHE)
+#define PAGE_KERNEL	__pgprot(SUN3_PAGE_VALID \
+				 | SUN3_PAGE_WRITEABLE \
+				 | SUN3_PAGE_SYSTEM \
+				 | SUN3_PAGE_NOCACHE \
+				 | SUN3_PAGE_ACCESSED \
+				 | SUN3_PAGE_MODIFIED)
+#define PAGE_INIT	__pgprot(SUN3_PAGE_VALID \
+				 | SUN3_PAGE_WRITEABLE \
+				 | SUN3_PAGE_SYSTEM \
+				 | SUN3_PAGE_NOCACHE)
+
+/*
+ * Page protections for initialising protection_map. The sun3 has only two
+ * protection settings, valid (implying read and execute) and writeable. These
+ * are as close as we can get...
+ */
+#define __P000	PAGE_NONE
+#define __P001	PAGE_READONLY
+#define __P010	PAGE_COPY
+#define __P011	PAGE_COPY
+#define __P100	PAGE_READONLY
+#define __P101	PAGE_READONLY
+#define __P110	PAGE_COPY
+#define __P111	PAGE_COPY
+
+#define __S000	PAGE_NONE
+#define __S001	PAGE_READONLY
+#define __S010	PAGE_SHARED
+#define __S011	PAGE_SHARED
+#define __S100	PAGE_READONLY
+#define __S101	PAGE_READONLY
+#define __S110	PAGE_SHARED
+#define __S111	PAGE_SHARED
+
+/* Use these fake page-protections on PMDs. */
+#define SUN3_PMD_VALID	(0x00000001)
+#define SUN3_PMD_MASK	(0x0000003F)
+#define SUN3_PMD_MAGIC	(0x0000002B)
+
+#ifndef __ASSEMBLY__
+
+/*
+ * 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) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
+	return pte;
+}
+
+#define pmd_set(pmdp,ptep) do {} while (0)
+
+static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
+{
+	pgd_val(*pgdp) = virt_to_phys(pmdp);
+}
+
+#define __pte_page(pte) \
+((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
+#define __pmd_page(pmd) \
+((unsigned long) __va (pmd_val (pmd) & PAGE_MASK))
+
+static inline int pte_none (pte_t pte) { return !pte_val (pte); }
+static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
+static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	pte_val (*ptep) = 0;
+}
+
+#define pte_pfn(pte)            (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
+#define pfn_pte(pfn, pgprot) \
+({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
+
+#define pte_page(pte)		virt_to_page(__pte_page(pte))
+#define pmd_page(pmd)		virt_to_page(__pmd_page(pmd))
+
+
+static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
+#define pmd_none(pmd) pmd_none2(&(pmd))
+//static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
+static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
+#define pmd_bad(pmd) pmd_bad2(&(pmd))
+static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
+/* #define pmd_present(pmd) pmd_present2(&(pmd)) */
+#define pmd_present(pmd) (!pmd_none2(&(pmd)))
+static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
+
+static inline int pgd_none (pgd_t pgd) { return 0; }
+static inline int pgd_bad (pgd_t pgd) { return 0; }
+static inline int pgd_present (pgd_t pgd) { return 1; }
+static inline void pgd_clear (pgd_t *pgdp) {}
+
+
+#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...
+ * [we have the full set here even if they don't change from m68k]
+ */
+static inline int pte_write(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
+static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_MODIFIED; }
+static inline int pte_young(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_ACCESSED; }
+static inline int pte_file(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_ACCESSED; }
+static inline int pte_special(pte_t pte)	{ return 0; }
+
+static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
+static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
+static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
+static inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
+static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
+static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
+static inline pte_t pte_mknocache(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
+// use this version when caches work...
+//static inline pte_t pte_mkcache(pte_t pte)	{ pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
+// until then, use:
+static inline pte_t pte_mkcache(pte_t pte)	{ return pte; }
+static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
+
+/* Find an entry in a pagetable directory. */
+#define pgd_index(address)     ((address) >> PGDIR_SHIFT)
+
+#define pgd_offset(mm, address) \
+((mm)->pgd + pgd_index(address))
+
+/* Find an entry in a kernel pagetable directory. */
+#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+
+/* Find an entry in the second-level pagetable. */
+static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
+{
+	return (pmd_t *) pgd;
+}
+
+static inline unsigned long pte_to_pgoff(pte_t pte)
+{
+	return pte.pte & SUN3_PAGE_PGNUM_MASK;
+}
+
+static inline pte_t pgoff_to_pte(unsigned off)
+{
+	pte_t pte = { off + SUN3_PAGE_ACCESSED };
+	return pte;
+}
+
+
+/* Find an entry in the third-level pagetable. */
+#define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
+#define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
+/* FIXME: should we bother with kmap() here? */
+#define pte_offset_map(pmd, address) ((pte_t *)kmap(pmd_page(*pmd)) + pte_index(address))
+#define pte_offset_map_nested(pmd, address) pte_offset_map(pmd, address)
+#define pte_unmap(pte) kunmap(pte)
+#define pte_unmap_nested(pte) kunmap(pte)
+
+/* Macros to (de)construct the fake PTEs representing swap pages. */
+#define __swp_type(x)		((x).val & 0x7F)
+#define __swp_offset(x)		(((x).val) >> 7)
+#define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
+#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	/* !_SUN3_PGTABLE_H */