arch/m32r/include/asm/pgtable.h - arm/linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _ASM_M32R_PGTABLE_H
 #define _ASM_M32R_PGTABLE_H

 #include <asm-generic/4level-fixup.h>

 #ifdef __KERNEL__
 /*
  * The Linux memory management assumes a three-level page table setup. On
  * the M32R, we use that, but "fold" the mid level into the top-level page
  * table, so that we physically have the same two-level page table as the
  * M32R mmu expects.
  *
  * This file contains the functions and defines necessary to modify and use
  * the M32R page table tree.
  */

 /* CAUTION!: If you change macro definitions in this file, you might have to
  * change arch/m32r/mmu.S manually.
  */

 #ifndef __ASSEMBLY__

 #include <linux/threads.h>
 #include <linux/bitops.h>
 #include <asm/processor.h>
 #include <asm/addrspace.h>
 #include <asm/page.h>

 struct mm_struct;
 struct vm_area_struct;

 extern pgd_t swapper_pg_dir[1024];
 extern void paging_init(void);

 /*
  * ZERO_PAGE is a global shared page that is always zero: used
  * for zero-mapped memory areas etc..
  */
 extern unsigned long empty_zero_page[1024];
 #define ZERO_PAGE(vaddr)	(virt_to_page(empty_zero_page))

 #endif /* !__ASSEMBLY__ */

 #ifndef __ASSEMBLY__
 #include <asm/pgtable-2level.h>
 #endif

 #define pgtable_cache_init()	do { } while (0)

 #define PMD_SIZE	(1UL << PMD_SHIFT)
 #define PMD_MASK	(~(PMD_SIZE - 1))
 #define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
 #define PGDIR_MASK	(~(PGDIR_SIZE - 1))

 #define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)
 #define FIRST_USER_ADDRESS	0UL

 #ifndef __ASSEMBLY__
 /* Just any arbitrary offset to the start of the vmalloc VM area: the
  * current 8MB value just means that there will be a 8MB "hole" after the
  * physical memory until the kernel virtual memory starts.  That means that
  * any out-of-bounds memory accesses will hopefully be caught.
  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  * area for the same reason. ;)
  */
 #define VMALLOC_START		KSEG2
 #define VMALLOC_END		KSEG3

 /*
  *     M32R TLB format
  *
  *     [0]    [1:19]           [20:23]       [24:31]
  *     +-----------------------+----+-------------+
  *     |          VPN          |0000|    ASID     |
  *     +-----------------------+----+-------------+
  *     +-+---------------------+----+-+---+-+-+-+-+
  *     |0         PPN          |0000|N|AC |L|G|V| |
  *     +-+---------------------+----+-+---+-+-+-+-+
  *                                     RWX
  */

 #define _PAGE_BIT_DIRTY		0	/* software: page changed */
 #define _PAGE_BIT_PRESENT	1	/* Valid: page is valid */
 #define _PAGE_BIT_GLOBAL	2	/* Global */
 #define _PAGE_BIT_LARGE		3	/* Large */
 #define _PAGE_BIT_EXEC		4	/* Execute */
 #define _PAGE_BIT_WRITE		5	/* Write */
 #define _PAGE_BIT_READ		6	/* Read */
 #define _PAGE_BIT_NONCACHABLE	7	/* Non cachable */
 #define _PAGE_BIT_ACCESSED	8	/* software: page referenced */
 #define _PAGE_BIT_PROTNONE	9	/* software: if not present */

 #define _PAGE_DIRTY		(1UL << _PAGE_BIT_DIRTY)
 #define _PAGE_PRESENT		(1UL << _PAGE_BIT_PRESENT)
 #define _PAGE_GLOBAL		(1UL << _PAGE_BIT_GLOBAL)
 #define _PAGE_LARGE		(1UL << _PAGE_BIT_LARGE)
 #define _PAGE_EXEC		(1UL << _PAGE_BIT_EXEC)
 #define _PAGE_WRITE		(1UL << _PAGE_BIT_WRITE)
 #define _PAGE_READ		(1UL << _PAGE_BIT_READ)
 #define _PAGE_NONCACHABLE	(1UL << _PAGE_BIT_NONCACHABLE)
 #define _PAGE_ACCESSED		(1UL << _PAGE_BIT_ACCESSED)
 #define _PAGE_PROTNONE		(1UL << _PAGE_BIT_PROTNONE)

 #define _PAGE_TABLE	\
 	( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
 	| _PAGE_DIRTY )
 #define _KERNPG_TABLE	\
 	( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
 	| _PAGE_DIRTY )
 #define _PAGE_CHG_MASK	\
 	( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )

 #ifdef CONFIG_MMU
 #define PAGE_NONE	\
 	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 #define PAGE_SHARED	\
 	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
 #define PAGE_SHARED_EXEC \
 	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
 		| _PAGE_ACCESSED)
 #define PAGE_COPY	\
 	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
 #define PAGE_COPY_EXEC	\
 	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
 #define PAGE_READONLY	\
 	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
 #define PAGE_READONLY_EXEC \
 	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)

 #define __PAGE_KERNEL	\
 	( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
 	| _PAGE_ACCESSED )
 #define __PAGE_KERNEL_RO	( __PAGE_KERNEL & ~_PAGE_WRITE )
 #define __PAGE_KERNEL_NOCACHE	( __PAGE_KERNEL | _PAGE_NONCACHABLE)

 #define MAKE_GLOBAL(x)	__pgprot((x) | _PAGE_GLOBAL)

 #define PAGE_KERNEL		MAKE_GLOBAL(__PAGE_KERNEL)
 #define PAGE_KERNEL_RO		MAKE_GLOBAL(__PAGE_KERNEL_RO)
 #define PAGE_KERNEL_NOCACHE	MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)

 #else
 #define PAGE_NONE		__pgprot(0)
 #define PAGE_SHARED		__pgprot(0)
 #define PAGE_SHARED_EXEC	__pgprot(0)
 #define PAGE_COPY		__pgprot(0)
 #define PAGE_COPY_EXEC		__pgprot(0)
 #define PAGE_READONLY		__pgprot(0)
 #define PAGE_READONLY_EXEC	__pgprot(0)

 #define PAGE_KERNEL		__pgprot(0)
 #define PAGE_KERNEL_RO		__pgprot(0)
 #define PAGE_KERNEL_NOCACHE	__pgprot(0)
 #endif /* CONFIG_MMU */

 	/* xwr */
 #define __P000	PAGE_NONE
 #define __P001	PAGE_READONLY
 #define __P010	PAGE_COPY
 #define __P011	PAGE_COPY
 #define __P100	PAGE_READONLY_EXEC
 #define __P101	PAGE_READONLY_EXEC
 #define __P110	PAGE_COPY_EXEC
 #define __P111	PAGE_COPY_EXEC

 #define __S000	PAGE_NONE
 #define __S001	PAGE_READONLY
 #define __S010	PAGE_SHARED
 #define __S011	PAGE_SHARED
 #define __S100	PAGE_READONLY_EXEC
 #define __S101	PAGE_READONLY_EXEC
 #define __S110	PAGE_SHARED_EXEC
 #define __S111	PAGE_SHARED_EXEC

 /* page table for 0-4MB for everybody */

 #define pte_present(x)	(pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 #define pte_clear(mm,addr,xp)	do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)

 #define pmd_none(x)	(!pmd_val(x))
 #define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)
 #define pmd_clear(xp)	do { set_pmd(xp, __pmd(0)); } while (0)
 #define	pmd_bad(x)	((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)

 #define pages_to_mb(x)	((x) >> (20 - PAGE_SHIFT))

 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
  */
 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_write(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_WRITE;
 }

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

 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_wrprotect(pte_t pte)
 {
 	pte_val(pte) &= ~_PAGE_WRITE;
 	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_mkwrite(pte_t pte)
 {
 	pte_val(pte) |= _PAGE_WRITE;
 	return pte;
 }

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

 static inline  int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 {
 	return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
 }

 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
 	clear_bit(_PAGE_BIT_WRITE, ptep);
 }

 /*
  * Macro and implementation to make a page protection as uncachable.
  */
 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 {
 	unsigned long prot = pgprot_val(_prot);

 	prot |= _PAGE_NONCACHABLE;
 	return __pgprot(prot);
 }

 #define pgprot_writecombine(prot) pgprot_noncached(prot)

 /*
  * 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)
 {
 	set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
 		| pgprot_val(newprot)));

 	return pte;
 }

 /*
  * Conversion functions: convert a page and protection to a page entry,
  * and a page entry and page directory to the page they refer to.
  */

 static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
 {
 	pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
 }

 #define pmd_page_vaddr(pmd)	\
 	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))

 #ifndef CONFIG_DISCONTIGMEM
 #define pmd_page(pmd)	(mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
 #endif /* !CONFIG_DISCONTIGMEM */

 /* to find an entry in a page-table-directory. */
 #define pgd_index(address)	\
 	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))

 #define pgd_offset(mm, address)	((mm)->pgd + pgd_index(address))

 /* to find an entry in a kernel page-table-directory */
 #define pgd_offset_k(address)	pgd_offset(&init_mm, address)

 #define pmd_index(address)	\
 	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))

 #define pte_index(address)	\
 	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 #define pte_offset_kernel(dir, address)	\
 	((pte_t *)pmd_page_vaddr(*(dir)) + pte_index(address))
 #define pte_offset_map(dir, address)	\
 	((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
 #define pte_unmap(pte)		do { } while (0)

 /* Encode and de-code a swap entry */
 #define __swp_type(x)			(((x).val >> 2) & 0x1f)
 #define __swp_offset(x)			((x).val >> 10)
 #define __swp_entry(type, offset)	\
 	((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })

 #endif /* !__ASSEMBLY__ */

 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 #define kern_addr_valid(addr)	(1)

 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 #define __HAVE_ARCH_PTE_SAME
 #include <asm-generic/pgtable.h>

 #endif /* __KERNEL__ */

 #endif /* _ASM_M32R_PGTABLE_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef _ASM_M32R_PGTABLE_H
	#define _ASM_M32R_PGTABLE_H

	#include <asm-generic/4level-fixup.h>

	#ifdef __KERNEL__
	/*
	* The Linux memory management assumes a three-level page table setup. On
	* the M32R, we use that, but "fold" the mid level into the top-level page
	* table, so that we physically have the same two-level page table as the
	* M32R mmu expects.
	*
	* This file contains the functions and defines necessary to modify and use
	* the M32R page table tree.
	*/

	/* CAUTION!: If you change macro definitions in this file, you might have to
	* change arch/m32r/mmu.S manually.
	*/

	#ifndef __ASSEMBLY__

	#include <linux/threads.h>
	#include <linux/bitops.h>
	#include <asm/processor.h>
	#include <asm/addrspace.h>
	#include <asm/page.h>

	struct mm_struct;
	struct vm_area_struct;

	extern pgd_t swapper_pg_dir[1024];
	extern void paging_init(void);

	/*
	* ZERO_PAGE is a global shared page that is always zero: used
	* for zero-mapped memory areas etc..
	*/
	extern unsigned long empty_zero_page[1024];
	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))

	#endif /* !__ASSEMBLY__ */

	#ifndef __ASSEMBLY__
	#include <asm/pgtable-2level.h>
	#endif

	#define pgtable_cache_init() do { } while (0)

	#define PMD_SIZE (1UL << PMD_SHIFT)
	#define PMD_MASK (~(PMD_SIZE - 1))
	#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
	#define PGDIR_MASK (~(PGDIR_SIZE - 1))

	#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
	#define FIRST_USER_ADDRESS 0UL

	#ifndef __ASSEMBLY__
	/* Just any arbitrary offset to the start of the vmalloc VM area: the
	* current 8MB value just means that there will be a 8MB "hole" after the
	* physical memory until the kernel virtual memory starts. That means that
	* any out-of-bounds memory accesses will hopefully be caught.
	* The vmalloc() routines leaves a hole of 4kB between each vmalloced
	* area for the same reason. ;)
	*/
	#define VMALLOC_START KSEG2
	#define VMALLOC_END KSEG3

	/*
	* M32R TLB format
	*
	* [0] [1:19] [20:23] [24:31]
	* +-----------------------+----+-------------+
	* \| VPN \|0000\| ASID \|
	* +-----------------------+----+-------------+
	* +-+---------------------+----+-+---+-+-+-+-+
	* \|0 PPN \|0000\|N\|AC \|L\|G\|V\| \|
	* +-+---------------------+----+-+---+-+-+-+-+
	* RWX
	*/

	#define _PAGE_BIT_DIRTY 0 /* software: page changed */
	#define _PAGE_BIT_PRESENT 1 /* Valid: page is valid */
	#define _PAGE_BIT_GLOBAL 2 /* Global */
	#define _PAGE_BIT_LARGE 3 /* Large */
	#define _PAGE_BIT_EXEC 4 /* Execute */
	#define _PAGE_BIT_WRITE 5 /* Write */
	#define _PAGE_BIT_READ 6 /* Read */
	#define _PAGE_BIT_NONCACHABLE 7 /* Non cachable */
	#define _PAGE_BIT_ACCESSED 8 /* software: page referenced */
	#define _PAGE_BIT_PROTNONE 9 /* software: if not present */

	#define _PAGE_DIRTY (1UL << _PAGE_BIT_DIRTY)
	#define _PAGE_PRESENT (1UL << _PAGE_BIT_PRESENT)
	#define _PAGE_GLOBAL (1UL << _PAGE_BIT_GLOBAL)
	#define _PAGE_LARGE (1UL << _PAGE_BIT_LARGE)
	#define _PAGE_EXEC (1UL << _PAGE_BIT_EXEC)
	#define _PAGE_WRITE (1UL << _PAGE_BIT_WRITE)
	#define _PAGE_READ (1UL << _PAGE_BIT_READ)
	#define _PAGE_NONCACHABLE (1UL << _PAGE_BIT_NONCACHABLE)
	#define _PAGE_ACCESSED (1UL << _PAGE_BIT_ACCESSED)
	#define _PAGE_PROTNONE (1UL << _PAGE_BIT_PROTNONE)

	#define _PAGE_TABLE \
	( _PAGE_PRESENT \| _PAGE_WRITE \| _PAGE_READ \| _PAGE_ACCESSED \
	\| _PAGE_DIRTY )
	#define _KERNPG_TABLE \
	( _PAGE_PRESENT \| _PAGE_WRITE \| _PAGE_READ \| _PAGE_ACCESSED \
	\| _PAGE_DIRTY )
	#define _PAGE_CHG_MASK \
	( PTE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY )

	#ifdef CONFIG_MMU
	#define PAGE_NONE \
	__pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
	#define PAGE_SHARED \
	__pgprot(_PAGE_PRESENT \| _PAGE_WRITE \| _PAGE_READ \| _PAGE_ACCESSED)
	#define PAGE_SHARED_EXEC \
	__pgprot(_PAGE_PRESENT \| _PAGE_EXEC \| _PAGE_WRITE \| _PAGE_READ \
	\| _PAGE_ACCESSED)
	#define PAGE_COPY \
	__pgprot(_PAGE_PRESENT \| _PAGE_READ \| _PAGE_ACCESSED)
	#define PAGE_COPY_EXEC \
	__pgprot(_PAGE_PRESENT \| _PAGE_EXEC \| _PAGE_READ \| _PAGE_ACCESSED)
	#define PAGE_READONLY \
	__pgprot(_PAGE_PRESENT \| _PAGE_READ \| _PAGE_ACCESSED)
	#define PAGE_READONLY_EXEC \
	__pgprot(_PAGE_PRESENT \| _PAGE_EXEC \| _PAGE_READ \| _PAGE_ACCESSED)

	#define __PAGE_KERNEL \
	( _PAGE_PRESENT \| _PAGE_EXEC \| _PAGE_WRITE \| _PAGE_READ \| _PAGE_DIRTY \
	\| _PAGE_ACCESSED )
	#define __PAGE_KERNEL_RO ( __PAGE_KERNEL & ~_PAGE_WRITE )
	#define __PAGE_KERNEL_NOCACHE ( __PAGE_KERNEL \| _PAGE_NONCACHABLE)

	#define MAKE_GLOBAL(x) __pgprot((x) \| _PAGE_GLOBAL)

	#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
	#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
	#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)

	#else
	#define PAGE_NONE __pgprot(0)
	#define PAGE_SHARED __pgprot(0)
	#define PAGE_SHARED_EXEC __pgprot(0)
	#define PAGE_COPY __pgprot(0)
	#define PAGE_COPY_EXEC __pgprot(0)
	#define PAGE_READONLY __pgprot(0)
	#define PAGE_READONLY_EXEC __pgprot(0)

	#define PAGE_KERNEL __pgprot(0)
	#define PAGE_KERNEL_RO __pgprot(0)
	#define PAGE_KERNEL_NOCACHE __pgprot(0)
	#endif /* CONFIG_MMU */

	/* xwr */
	#define __P000 PAGE_NONE
	#define __P001 PAGE_READONLY
	#define __P010 PAGE_COPY
	#define __P011 PAGE_COPY
	#define __P100 PAGE_READONLY_EXEC
	#define __P101 PAGE_READONLY_EXEC
	#define __P110 PAGE_COPY_EXEC
	#define __P111 PAGE_COPY_EXEC

	#define __S000 PAGE_NONE
	#define __S001 PAGE_READONLY
	#define __S010 PAGE_SHARED
	#define __S011 PAGE_SHARED
	#define __S100 PAGE_READONLY_EXEC
	#define __S101 PAGE_READONLY_EXEC
	#define __S110 PAGE_SHARED_EXEC
	#define __S111 PAGE_SHARED_EXEC

	/* page table for 0-4MB for everybody */

	#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT \| _PAGE_PROTNONE))
	#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)

	#define pmd_none(x) (!pmd_val(x))
	#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
	#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
	#define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)

	#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))

	/*
	* The following only work if pte_present() is true.
	* Undefined behaviour if not..
	*/
	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_write(pte_t pte)
	{
	return pte_val(pte) & _PAGE_WRITE;
	}

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

	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_wrprotect(pte_t pte)
	{
	pte_val(pte) &= ~_PAGE_WRITE;
	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_mkwrite(pte_t pte)
	{
	pte_val(pte) \|= _PAGE_WRITE;
	return pte;
	}

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

	static inline int ptep_test_and_clear_young(struct vm_area_struct vma, unsigned long addr, pte_t ptep)
	{
	return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
	}

	static inline void ptep_set_wrprotect(struct mm_struct mm, unsigned long addr, pte_t ptep)
	{
	clear_bit(_PAGE_BIT_WRITE, ptep);
	}

	/*
	* Macro and implementation to make a page protection as uncachable.
	*/
	static inline pgprot_t pgprot_noncached(pgprot_t _prot)
	{
	unsigned long prot = pgprot_val(_prot);

	prot \|= _PAGE_NONCACHABLE;
	return __pgprot(prot);
	}

	#define pgprot_writecombine(prot) pgprot_noncached(prot)

	/*
	* 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)
	{
	set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
	\| pgprot_val(newprot)));

	return pte;
	}

	/*
	* Conversion functions: convert a page and protection to a page entry,
	* and a page entry and page directory to the page they refer to.
	*/

	static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
	{
	pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
	}

	#define pmd_page_vaddr(pmd) \
	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))

	#ifndef CONFIG_DISCONTIGMEM
	#define pmd_page(pmd) (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
	#endif /* !CONFIG_DISCONTIGMEM */

	/* to find an entry in a page-table-directory. */
	#define pgd_index(address) \
	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))

	#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))

	/* to find an entry in a kernel page-table-directory */
	#define pgd_offset_k(address) pgd_offset(&init_mm, address)

	#define pmd_index(address) \
	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))

	#define pte_index(address) \
	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
	#define pte_offset_kernel(dir, address) \
	((pte_t )pmd_page_vaddr((dir)) + pte_index(address))
	#define pte_offset_map(dir, address) \
	((pte_t )page_address(pmd_page((dir))) + pte_index(address))
	#define pte_unmap(pte) do { } while (0)

	/* Encode and de-code a swap entry */
	#define __swp_type(x) (((x).val >> 2) & 0x1f)
	#define __swp_offset(x) ((x).val >> 10)
	#define __swp_entry(type, offset) \
	((swp_entry_t) { ((type) << 2) \| ((offset) << 10) })
	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })

	#endif /* !__ASSEMBLY__ */

	/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
	#define kern_addr_valid(addr) (1)

	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
	#define __HAVE_ARCH_PTE_SAME
	#include <asm-generic/pgtable.h>

	#endif /* __KERNEL__ */

	#endif /* _ASM_M32R_PGTABLE_H */