arch/m68k/include/asm/motorola_pgtable.h - kernel/prism - Git at Google

 #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 */
	#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 */