arch/m68k/include/asm/mcf_pgtable.h - kernel/msm-5.4 - Gitiles

 #ifndef _MCF_PGTABLE_H
 #define _MCF_PGTABLE_H

 #include <asm/mcfmmu.h>
 #include <asm/page.h>

 /*
  * MMUDR bits, in proper place. We write these directly into the MMUDR
  * after masking from the pte.
  */
 #define CF_PAGE_LOCKED		MMUDR_LK	/* 0x00000002 */
 #define CF_PAGE_EXEC		MMUDR_X		/* 0x00000004 */
 #define CF_PAGE_WRITABLE	MMUDR_W		/* 0x00000008 */
 #define CF_PAGE_READABLE	MMUDR_R		/* 0x00000010 */
 #define CF_PAGE_SYSTEM		MMUDR_SP	/* 0x00000020 */
 #define CF_PAGE_COPYBACK	MMUDR_CM_CCB	/* 0x00000040 */
 #define CF_PAGE_NOCACHE		MMUDR_CM_NCP	/* 0x00000080 */

 #define CF_CACHEMASK		(~MMUDR_CM_CCB)
 #define CF_PAGE_MMUDR_MASK	0x000000fe

 #define _PAGE_NOCACHE030	CF_PAGE_NOCACHE

 /*
  * MMUTR bits, need shifting down.
  */
 #define CF_PAGE_MMUTR_MASK	0x00000c00
 #define CF_PAGE_MMUTR_SHIFT	10

 #define CF_PAGE_VALID		(MMUTR_V << CF_PAGE_MMUTR_SHIFT)
 #define CF_PAGE_SHARED		(MMUTR_SG << CF_PAGE_MMUTR_SHIFT)

 /*
  * Fake bits, not implemented in CF, will get masked out before
  * hitting hardware.
  */
 #define CF_PAGE_DIRTY		0x00000001
 #define CF_PAGE_FILE		0x00000200
 #define CF_PAGE_ACCESSED	0x00001000

 #define _PAGE_CACHE040		0x020   /* 68040 cache mode, cachable, copyback */
 #define _PAGE_NOCACHE_S		0x040   /* 68040 no-cache mode, serialized */
 #define _PAGE_NOCACHE		0x060   /* 68040 cache mode, non-serialized */
 #define _PAGE_CACHE040W		0x000   /* 68040 cache mode, cachable, write-through */
 #define _DESCTYPE_MASK		0x003
 #define _CACHEMASK040		(~0x060)
 #define _PAGE_GLOBAL040		0x400   /* 68040 global bit, used for kva descs */

 /*
  * Externally used page protection values.
  */
 #define _PAGE_PRESENT	(CF_PAGE_VALID)
 #define _PAGE_ACCESSED	(CF_PAGE_ACCESSED)
 #define _PAGE_DIRTY	(CF_PAGE_DIRTY)
 #define _PAGE_READWRITE (CF_PAGE_READABLE \
 				| CF_PAGE_WRITABLE \
 				| CF_PAGE_SYSTEM \
 				| CF_PAGE_SHARED)

 /*
  * Compound page protection values.
  */
 #define PAGE_NONE	__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED)

 #define PAGE_SHARED     __pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_SHARED)

 #define PAGE_INIT	__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_READABLE \
 				 | CF_PAGE_WRITABLE \
 				 | CF_PAGE_EXEC \
 				 | CF_PAGE_SYSTEM)

 #define PAGE_KERNEL	__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_READABLE \
 				 | CF_PAGE_WRITABLE \
 				 | CF_PAGE_EXEC \
 				 | CF_PAGE_SYSTEM)

 #define PAGE_COPY	__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_READABLE \
 				 | CF_PAGE_DIRTY)

 /*
  * Page protections for initialising protection_map. See mm/mmap.c
  * for use. In general, the bit positions are xwr, and P-items are
  * private, the S-items are shared.
  */
 #define __P000		PAGE_NONE
 #define __P001		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_READABLE)
 #define __P010		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_WRITABLE)
 #define __P011		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_READABLE \
 				 | CF_PAGE_WRITABLE)
 #define __P100		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_EXEC)
 #define __P101		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_READABLE \
 				 | CF_PAGE_EXEC)
 #define __P110		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_WRITABLE \
 				 | CF_PAGE_EXEC)
 #define __P111		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_READABLE \
 				 | CF_PAGE_WRITABLE \
 				 | CF_PAGE_EXEC)

 #define __S000		PAGE_NONE
 #define __S001		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_READABLE)
 #define __S010		PAGE_SHARED
 #define __S011		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_SHARED \
 				 | CF_PAGE_READABLE)
 #define __S100		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_EXEC)
 #define __S101		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_READABLE \
 				 | CF_PAGE_EXEC)
 #define __S110		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_SHARED \
 				 | CF_PAGE_EXEC)
 #define __S111		__pgprot(CF_PAGE_VALID \
 				 | CF_PAGE_ACCESSED \
 				 | CF_PAGE_SHARED \
 				 | CF_PAGE_READABLE \
 				 | CF_PAGE_EXEC)

 #define PTE_MASK	PAGE_MASK
 #define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)

 #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) & CF_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) (pte_val(pte) & PAGE_MASK))
 #define __pmd_page(pmd)	((unsigned long) (pmd_val(pmd)))

 static inline int pte_none(pte_t pte)
 {
 	return !pte_val(pte);
 }

 static inline int pte_present(pte_t pte)
 {
 	return pte_val(pte) & CF_PAGE_VALID;
 }

 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 	pte_t *ptep)
 {
 	pte_val(*ptep) = 0;
 }

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

 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
 #define pmd_none(pmd) pmd_none2(&(pmd))
 static inline int pmd_bad2(pmd_t *pmd) { return 0; }
 #define pmd_bad(pmd) pmd_bad2(&(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(KERN_ERR "%s:%d: bad pte %08lx.\n",	\
 	__FILE__, __LINE__, pte_val(e))
 #define pmd_ERROR(e) \
 	printk(KERN_ERR "%s:%d: bad pmd %08lx.\n",	\
 	__FILE__, __LINE__, pmd_val(e))
 #define pgd_ERROR(e) \
 	printk(KERN_ERR "%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 pte_val(pte) & CF_PAGE_READABLE;
 }

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

 static inline int pte_exec(pte_t pte)
 {
 	return pte_val(pte) & CF_PAGE_EXEC;
 }

 static inline int pte_dirty(pte_t pte)
 {
 	return pte_val(pte) & CF_PAGE_DIRTY;
 }

 static inline int pte_young(pte_t pte)
 {
 	return pte_val(pte) & CF_PAGE_ACCESSED;
 }

 static inline int pte_file(pte_t pte)
 {
 	return pte_val(pte) & CF_PAGE_FILE;
 }

 static inline int pte_special(pte_t pte)
 {
 	return 0;
 }

 static inline pte_t pte_wrprotect(pte_t pte)
 {
 	pte_val(pte) &= ~CF_PAGE_WRITABLE;
 	return pte;
 }

 static inline pte_t pte_rdprotect(pte_t pte)
 {
 	pte_val(pte) &= ~CF_PAGE_READABLE;
 	return pte;
 }

 static inline pte_t pte_exprotect(pte_t pte)
 {
 	pte_val(pte) &= ~CF_PAGE_EXEC;
 	return pte;
 }

 static inline pte_t pte_mkclean(pte_t pte)
 {
 	pte_val(pte) &= ~CF_PAGE_DIRTY;
 	return pte;
 }

 static inline pte_t pte_mkold(pte_t pte)
 {
 	pte_val(pte) &= ~CF_PAGE_ACCESSED;
 	return pte;
 }

 static inline pte_t pte_mkwrite(pte_t pte)
 {
 	pte_val(pte) |= CF_PAGE_WRITABLE;
 	return pte;
 }

 static inline pte_t pte_mkread(pte_t pte)
 {
 	pte_val(pte) |= CF_PAGE_READABLE;
 	return pte;
 }

 static inline pte_t pte_mkexec(pte_t pte)
 {
 	pte_val(pte) |= CF_PAGE_EXEC;
 	return pte;
 }

 static inline pte_t pte_mkdirty(pte_t pte)
 {
 	pte_val(pte) |= CF_PAGE_DIRTY;
 	return pte;
 }

 static inline pte_t pte_mkyoung(pte_t pte)
 {
 	pte_val(pte) |= CF_PAGE_ACCESSED;
 	return pte;
 }

 static inline pte_t pte_mknocache(pte_t pte)
 {
 	pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
 	return pte;
 }

 static inline pte_t pte_mkcache(pte_t pte)
 {
 	pte_val(pte) &= ~CF_PAGE_NOCACHE;
 	return pte;
 }

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

 #define swapper_pg_dir kernel_pg_dir
 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(address)	((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 #define pte_offset_kernel(dir, address) \
 	((pte_t *) __pmd_page(*(dir)) + __pte_offset(address))

 /*
  * Disable caching for page at given kernel virtual address.
  */
 static inline void nocache_page(void *vaddr)
 {
 	pgd_t *dir;
 	pmd_t *pmdp;
 	pte_t *ptep;
 	unsigned long addr = (unsigned long) vaddr;

 	dir = pgd_offset_k(addr);
 	pmdp = pmd_offset(dir, addr);
 	ptep = pte_offset_kernel(pmdp, addr);
 	*ptep = pte_mknocache(*ptep);
 }

 /*
  * Enable caching for page at given kernel virtual address.
  */
 static inline void cache_page(void *vaddr)
 {
 	pgd_t *dir;
 	pmd_t *pmdp;
 	pte_t *ptep;
 	unsigned long addr = (unsigned long) vaddr;

 	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	21
 #define PTE_FILE_SHIFT		11

 static inline unsigned long pte_to_pgoff(pte_t pte)
 {
 	return pte_val(pte) >> PTE_FILE_SHIFT;
 }

 static inline pte_t pgoff_to_pte(unsigned pgoff)
 {
 	return __pte((pgoff << PTE_FILE_SHIFT) + CF_PAGE_FILE);
 }

 /*
  * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
  */
 #define __swp_type(x)		((x).val & 0xFF)
 #define __swp_offset(x)		((x).val >> PTE_FILE_SHIFT)
 #define __swp_entry(typ, off)	((swp_entry_t) { (typ) | \
 					(off << PTE_FILE_SHIFT) })
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	(__pte((x).val))

 #define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))

 #define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \
 				       __pte_offset(addr))
 #define pte_unmap(pte)		((void) 0)
 #define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 #define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)

 #endif	/* !__ASSEMBLY__ */
 #endif	/* _MCF_PGTABLE_H */
	#ifndef _MCF_PGTABLE_H
	#define _MCF_PGTABLE_H

	#include <asm/mcfmmu.h>
	#include <asm/page.h>

	/*
	* MMUDR bits, in proper place. We write these directly into the MMUDR
	* after masking from the pte.
	*/
	#define CF_PAGE_LOCKED MMUDR_LK /* 0x00000002 */
	#define CF_PAGE_EXEC MMUDR_X /* 0x00000004 */
	#define CF_PAGE_WRITABLE MMUDR_W /* 0x00000008 */
	#define CF_PAGE_READABLE MMUDR_R /* 0x00000010 */
	#define CF_PAGE_SYSTEM MMUDR_SP /* 0x00000020 */
	#define CF_PAGE_COPYBACK MMUDR_CM_CCB /* 0x00000040 */
	#define CF_PAGE_NOCACHE MMUDR_CM_NCP /* 0x00000080 */

	#define CF_CACHEMASK (~MMUDR_CM_CCB)
	#define CF_PAGE_MMUDR_MASK 0x000000fe

	#define _PAGE_NOCACHE030 CF_PAGE_NOCACHE

	/*
	* MMUTR bits, need shifting down.
	*/
	#define CF_PAGE_MMUTR_MASK 0x00000c00
	#define CF_PAGE_MMUTR_SHIFT 10

	#define CF_PAGE_VALID (MMUTR_V << CF_PAGE_MMUTR_SHIFT)
	#define CF_PAGE_SHARED (MMUTR_SG << CF_PAGE_MMUTR_SHIFT)

	/*
	* Fake bits, not implemented in CF, will get masked out before
	* hitting hardware.
	*/
	#define CF_PAGE_DIRTY 0x00000001
	#define CF_PAGE_FILE 0x00000200
	#define CF_PAGE_ACCESSED 0x00001000

	#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
	#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
	#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
	#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
	#define _DESCTYPE_MASK 0x003
	#define _CACHEMASK040 (~0x060)
	#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */

	/*
	* Externally used page protection values.
	*/
	#define _PAGE_PRESENT (CF_PAGE_VALID)
	#define _PAGE_ACCESSED (CF_PAGE_ACCESSED)
	#define _PAGE_DIRTY (CF_PAGE_DIRTY)
	#define _PAGE_READWRITE (CF_PAGE_READABLE \
	\| CF_PAGE_WRITABLE \
	\| CF_PAGE_SYSTEM \
	\| CF_PAGE_SHARED)

	/*
	* Compound page protection values.
	*/
	#define PAGE_NONE __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED)

	#define PAGE_SHARED __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_SHARED)

	#define PAGE_INIT __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_READABLE \
	\| CF_PAGE_WRITABLE \
	\| CF_PAGE_EXEC \
	\| CF_PAGE_SYSTEM)

	#define PAGE_KERNEL __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_READABLE \
	\| CF_PAGE_WRITABLE \
	\| CF_PAGE_EXEC \
	\| CF_PAGE_SYSTEM)

	#define PAGE_COPY __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_READABLE \
	\| CF_PAGE_DIRTY)

	/*
	* Page protections for initialising protection_map. See mm/mmap.c
	* for use. In general, the bit positions are xwr, and P-items are
	* private, the S-items are shared.
	*/
	#define __P000 PAGE_NONE
	#define __P001 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_READABLE)
	#define __P010 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_WRITABLE)
	#define __P011 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_READABLE \
	\| CF_PAGE_WRITABLE)
	#define __P100 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_EXEC)
	#define __P101 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_READABLE \
	\| CF_PAGE_EXEC)
	#define __P110 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_WRITABLE \
	\| CF_PAGE_EXEC)
	#define __P111 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_READABLE \
	\| CF_PAGE_WRITABLE \
	\| CF_PAGE_EXEC)

	#define __S000 PAGE_NONE
	#define __S001 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_READABLE)
	#define __S010 PAGE_SHARED
	#define __S011 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_SHARED \
	\| CF_PAGE_READABLE)
	#define __S100 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_EXEC)
	#define __S101 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_READABLE \
	\| CF_PAGE_EXEC)
	#define __S110 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_SHARED \
	\| CF_PAGE_EXEC)
	#define __S111 __pgprot(CF_PAGE_VALID \
	\| CF_PAGE_ACCESSED \
	\| CF_PAGE_SHARED \
	\| CF_PAGE_READABLE \
	\| CF_PAGE_EXEC)

	#define PTE_MASK PAGE_MASK
	#define CF_PAGE_CHG_MASK (PTE_MASK \| CF_PAGE_ACCESSED \| CF_PAGE_DIRTY)

	#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) & CF_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) (pte_val(pte) & PAGE_MASK))
	#define __pmd_page(pmd) ((unsigned long) (pmd_val(pmd)))

	static inline int pte_none(pte_t pte)
	{
	return !pte_val(pte);
	}

	static inline int pte_present(pte_t pte)
	{
	return pte_val(pte) & CF_PAGE_VALID;
	}

	static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
	pte_t *ptep)
	{
	pte_val(*ptep) = 0;
	}

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

	static inline int pmd_none2(pmd_t pmd) { return !pmd_val(pmd); }
	#define pmd_none(pmd) pmd_none2(&(pmd))
	static inline int pmd_bad2(pmd_t *pmd) { return 0; }
	#define pmd_bad(pmd) pmd_bad2(&(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(KERN_ERR "%s:%d: bad pte %08lx.\n", \
	__FILE__, __LINE__, pte_val(e))
	#define pmd_ERROR(e) \
	printk(KERN_ERR "%s:%d: bad pmd %08lx.\n", \
	__FILE__, __LINE__, pmd_val(e))
	#define pgd_ERROR(e) \
	printk(KERN_ERR "%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 pte_val(pte) & CF_PAGE_READABLE;
	}

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

	static inline int pte_exec(pte_t pte)
	{
	return pte_val(pte) & CF_PAGE_EXEC;
	}

	static inline int pte_dirty(pte_t pte)
	{
	return pte_val(pte) & CF_PAGE_DIRTY;
	}

	static inline int pte_young(pte_t pte)
	{
	return pte_val(pte) & CF_PAGE_ACCESSED;
	}

	static inline int pte_file(pte_t pte)
	{
	return pte_val(pte) & CF_PAGE_FILE;
	}

	static inline int pte_special(pte_t pte)
	{
	return 0;
	}

	static inline pte_t pte_wrprotect(pte_t pte)
	{
	pte_val(pte) &= ~CF_PAGE_WRITABLE;
	return pte;
	}

	static inline pte_t pte_rdprotect(pte_t pte)
	{
	pte_val(pte) &= ~CF_PAGE_READABLE;
	return pte;
	}

	static inline pte_t pte_exprotect(pte_t pte)
	{
	pte_val(pte) &= ~CF_PAGE_EXEC;
	return pte;
	}

	static inline pte_t pte_mkclean(pte_t pte)
	{
	pte_val(pte) &= ~CF_PAGE_DIRTY;
	return pte;
	}

	static inline pte_t pte_mkold(pte_t pte)
	{
	pte_val(pte) &= ~CF_PAGE_ACCESSED;
	return pte;
	}

	static inline pte_t pte_mkwrite(pte_t pte)
	{
	pte_val(pte) \|= CF_PAGE_WRITABLE;
	return pte;
	}

	static inline pte_t pte_mkread(pte_t pte)
	{
	pte_val(pte) \|= CF_PAGE_READABLE;
	return pte;
	}

	static inline pte_t pte_mkexec(pte_t pte)
	{
	pte_val(pte) \|= CF_PAGE_EXEC;
	return pte;
	}

	static inline pte_t pte_mkdirty(pte_t pte)
	{
	pte_val(pte) \|= CF_PAGE_DIRTY;
	return pte;
	}

	static inline pte_t pte_mkyoung(pte_t pte)
	{
	pte_val(pte) \|= CF_PAGE_ACCESSED;
	return pte;
	}

	static inline pte_t pte_mknocache(pte_t pte)
	{
	pte_val(pte) \|= 0x80 \| (pte_val(pte) & ~0x40);
	return pte;
	}

	static inline pte_t pte_mkcache(pte_t pte)
	{
	pte_val(pte) &= ~CF_PAGE_NOCACHE;
	return pte;
	}

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

	#define swapper_pg_dir kernel_pg_dir
	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(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
	#define pte_offset_kernel(dir, address) \
	((pte_t ) __pmd_page((dir)) + __pte_offset(address))

	/*
	* Disable caching for page at given kernel virtual address.
	*/
	static inline void nocache_page(void *vaddr)
	{
	pgd_t *dir;
	pmd_t *pmdp;
	pte_t *ptep;
	unsigned long addr = (unsigned long) vaddr;

	dir = pgd_offset_k(addr);
	pmdp = pmd_offset(dir, addr);
	ptep = pte_offset_kernel(pmdp, addr);
	ptep = pte_mknocache(ptep);
	}

	/*
	* Enable caching for page at given kernel virtual address.
	*/
	static inline void cache_page(void *vaddr)
	{
	pgd_t *dir;
	pmd_t *pmdp;
	pte_t *ptep;
	unsigned long addr = (unsigned long) vaddr;

	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 21
	#define PTE_FILE_SHIFT 11

	static inline unsigned long pte_to_pgoff(pte_t pte)
	{
	return pte_val(pte) >> PTE_FILE_SHIFT;
	}

	static inline pte_t pgoff_to_pte(unsigned pgoff)
	{
	return __pte((pgoff << PTE_FILE_SHIFT) + CF_PAGE_FILE);
	}

	/*
	* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
	*/
	#define __swp_type(x) ((x).val & 0xFF)
	#define __swp_offset(x) ((x).val >> PTE_FILE_SHIFT)
	#define __swp_entry(typ, off) ((swp_entry_t) { (typ) \| \
	(off << PTE_FILE_SHIFT) })
	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	#define __swp_entry_to_pte(x) (__pte((x).val))

	#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))

	#define pte_offset_map(pmdp, addr) ((pte_t )__pmd_page(pmdp) + \
	__pte_offset(addr))
	#define pte_unmap(pte) ((void) 0)
	#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) \| pgprot_val(prot))
	#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)

	#endif /* !__ASSEMBLY__ */
	#endif /* _MCF_PGTABLE_H */