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#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)

/* 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) \

({ pte_t __pte; pte_val(__pte) = (__pa(page) >> PAGE_SHIFT) | pgprot_val(pgprot); __pte; })

#define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot))

#define mk_pte_phys(physpage, pgprot) \

({ pte_t __pte; pte_val(__pte) = ((physpage) >> PAGE_SHIFT) | pgprot_val(pgprot); __pte; })

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(pte_t *ptep) { pte_val (*ptep) = 0; }

/* FIXME: this is only a guess */

#define pte_pagenr(pte)         ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)

#define pte_page(pte)           (mem_map+pte_pagenr(pte))

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_read(pte_t pte)           { return 1; }

static inline int pte_write(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }

static inline int pte_exec(pte_t pte)           { return 1; }

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 pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }

static inline pte_t pte_rdprotect(pte_t pte)    { return pte; }

static inline pte_t pte_exprotect(pte_t pte)    { 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_mkread(pte_t pte)       { return pte; }

static inline pte_t pte_mkexec(pte_t pte)       { 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; }

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;

}

/* Find an entry in the third-level pagetable. */

#define pte_offset(pmd, address) \

((pte_t *) __pmd_page (*pmd) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1)))

/* Disable caching for page at given kernel virtual address. */

static inline void nocache_page (unsigned long vaddr)

{

        /* Don't think this is required on sun3. --m */

}

/* Enable caching for page at given kernel virtual address. */

static inline void cache_page (unsigned long vaddr)

{

        /* Don't think this is required on sun3. --m */

}

#endif  /* !__ASSEMBLY__ */

#endif  /* !_SUN3_PGTABLE_H */