include/asm-sh/pgtable.h - maze/linux - Git at Google

 #ifndef __ASM_SH_PGTABLE_H
 #define __ASM_SH_PGTABLE_H

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

 /*
  * Copyright (C) 1999 Niibe Yutaka
  * Copyright (C) 2002, 2003, 2004 Paul Mundt
  */

 #include <linux/config.h>
 #include <asm/pgtable-2level.h>

 /*
  * This file contains the functions and defines necessary to modify and use
  * the SuperH page table tree.
  */
 #ifndef __ASSEMBLY__
 #include <asm/processor.h>
 #include <asm/addrspace.h>
 #include <asm/fixmap.h>
 #include <linux/threads.h>

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

 /*
  * Basically we have the same two-level (which is the logical three level
  * Linux page table layout folded) page tables as the i386.
  */

 /*
  * 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__ */

 #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	0

 #define PTE_PHYS_MASK	0x1ffff000

 #ifndef __ASSEMBLY__
 /*
  * First 1MB map is used by fixed purpose.
  * Currently only 4-enty (16kB) is used (see arch/sh/mm/cache.c)
  */
 #define VMALLOC_START	(P3SEG+0x00100000)
 #define VMALLOC_END	(FIXADDR_START-2*PAGE_SIZE)

 #define	_PAGE_WT	0x001  /* WT-bit on SH-4, 0 on SH-3 */
 #define _PAGE_HW_SHARED	0x002  /* SH-bit  : page is shared among processes */
 #define _PAGE_DIRTY	0x004  /* D-bit   : page changed */
 #define _PAGE_CACHABLE	0x008  /* C-bit   : cachable */
 #define _PAGE_SZ0	0x010  /* SZ0-bit : Size of page */
 #define _PAGE_RW	0x020  /* PR0-bit : write access allowed */
 #define _PAGE_USER	0x040  /* PR1-bit : user space access allowed */
 #define _PAGE_SZ1	0x080  /* SZ1-bit : Size of page (on SH-4) */
 #define _PAGE_PRESENT	0x100  /* V-bit   : page is valid */
 #define _PAGE_PROTNONE	0x200  /* software: if not present  */
 #define _PAGE_ACCESSED 	0x400  /* software: page referenced */
 #define _PAGE_U0_SHARED 0x800  /* software: page is shared in user space */

 #define	_PAGE_FILE	_PAGE_WT  /* software: pagecache or swap? */

 /* software: moves to PTEA.TC (Timing Control) */
 #define _PAGE_PCC_AREA5	0x00000000	/* use BSC registers for area5 */
 #define _PAGE_PCC_AREA6	0x80000000	/* use BSC registers for area6 */

 /* software: moves to PTEA.SA[2:0] (Space Attributes) */
 #define _PAGE_PCC_IODYN 0x00000001	/* IO space, dynamically sized bus */
 #define _PAGE_PCC_IO8	0x20000000	/* IO space, 8 bit bus */
 #define _PAGE_PCC_IO16	0x20000001	/* IO space, 16 bit bus */
 #define _PAGE_PCC_COM8	0x40000000	/* Common Memory space, 8 bit bus */
 #define _PAGE_PCC_COM16	0x40000001	/* Common Memory space, 16 bit bus */
 #define _PAGE_PCC_ATR8	0x60000000	/* Attribute Memory space, 8 bit bus */
 #define _PAGE_PCC_ATR16	0x60000001	/* Attribute Memory space, 6 bit bus */


 /* Mask which drop software flags
  * We also drop WT bit since it is used for _PAGE_FILE
  * bit in this implementation.
  */
 #define _PAGE_CLEAR_FLAGS	(_PAGE_WT | _PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_U0_SHARED)

 #if defined(CONFIG_CPU_SH3)
 /*
  * MMU on SH-3 has bug on SH-bit: We can't use it if MMUCR.IX=1.
  * Work around: Just drop SH-bit.
  */
 #define _PAGE_FLAGS_HARDWARE_MASK	(0x1fffffff & ~(_PAGE_CLEAR_FLAGS | _PAGE_HW_SHARED))
 #else
 #define _PAGE_FLAGS_HARDWARE_MASK	(0x1fffffff & ~(_PAGE_CLEAR_FLAGS))
 #endif

 /* Hardware flags: SZ0=1 (4k-byte) */
 #define _PAGE_FLAGS_HARD	_PAGE_SZ0

 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 #define _PAGE_SZHUGE	(_PAGE_SZ1)
 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
 #define _PAGE_SZHUGE	(_PAGE_SZ0 | _PAGE_SZ1)
 #endif

 #define _PAGE_SHARED	_PAGE_U0_SHARED

 #define _PAGE_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
 #define _KERNPG_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
 #define _PAGE_CHG_MASK	(PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_SHARED)

 #ifdef CONFIG_MMU
 #define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 #define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_SHARED | _PAGE_FLAGS_HARD)
 #define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 #define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 #define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 #define PAGE_KERNEL_NOCACHE \
 			__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 #define PAGE_KERNEL_RO	__pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 #define PAGE_KERNEL_PCC(slot, type) \
 			__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | (type))
 #else /* no mmu */
 #define PAGE_NONE		__pgprot(0)
 #define PAGE_SHARED		__pgprot(0)
 #define PAGE_COPY		__pgprot(0)
 #define PAGE_READONLY		__pgprot(0)
 #define PAGE_KERNEL		__pgprot(0)
 #define PAGE_KERNEL_NOCACHE	__pgprot(0)
 #define PAGE_KERNEL_RO		__pgprot(0)
 #define PAGE_KERNEL_PCC		__pgprot(0)
 #endif

 /*
  * As i386 and MIPS, SuperH can't do page protection for execute, and
  * considers that the same as a read.  Also, write permissions imply
  * read permissions. This is the closest 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

 #define pte_none(x)	(!pte_val(x))
 #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 & ~_PAGE_USER)) != _KERNPG_TABLE)

 #define pages_to_mb(x)	((x) >> (20-PAGE_SHIFT))
 #define pte_page(x) 	phys_to_page(pte_val(x)&PTE_PHYS_MASK)

 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
  */
 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
 static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
 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_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
 static inline int pte_not_present(pte_t pte){ return !(pte_val(pte) & _PAGE_PRESENT); }

 static inline pte_t pte_rdprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 static inline pte_t pte_exprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 static inline pte_t pte_mkclean(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
 static inline pte_t pte_mkold(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
 static inline pte_t pte_wrprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
 static inline pte_t pte_mkread(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 static inline pte_t pte_mkexec(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 static inline pte_t pte_mkdirty(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
 static inline pte_t pte_mkyoung(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
 static inline pte_t pte_mkwrite(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
 static inline pte_t pte_mkhuge(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; }

 /*
  * Macro and implementation to make a page protection as uncachable.
  */
 #define pgprot_noncached pgprot_noncached

 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 {
 	unsigned long prot = pgprot_val(_prot);

 	prot &= ~_PAGE_CACHABLE;
 	return __pgprot(prot);
 }

 #define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)

 /*
  * Conversion functions: convert a page and protection to a page entry,
  * and a page entry and page directory to the page they refer to.
  *
  * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
  */
 #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; }

 #define page_pte(page) page_pte_prot(page, __pgprot(0))

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

 #define pmd_page(pmd) \
 	(phys_to_page(pmd_val(pmd)))

 /* 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)

 /* Find an entry in the third-level page table.. */
 #define pte_index(address) \
 		((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 #define pte_offset_kernel(dir, address) \
 	((pte_t *) pmd_page_kernel(*(dir)) + pte_index(address))
 #define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
 #define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
 #define pte_unmap(pte)		do { } while (0)
 #define pte_unmap_nested(pte)	do { } while (0)

 struct vm_area_struct;
 extern void update_mmu_cache(struct vm_area_struct * vma,
 			     unsigned long address, pte_t pte);

 /* Encode and de-code a swap entry */
 /*
  * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
  *       and _PAGE_PROTNONE bits
  */
 #define __swp_type(x)		((x).val & 0xff)
 #define __swp_offset(x)		((x).val >> 10)
 #define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 10) })
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) >> 1 })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val << 1 })

 /*
  * Encode and decode a nonlinear file mapping entry
  */
 #define PTE_FILE_MAX_BITS	29
 #define pte_to_pgoff(pte)	(pte_val(pte) >> 1)
 #define pgoff_to_pte(off)	((pte_t) { ((off) << 1) | _PAGE_FILE })

 typedef pte_t *pte_addr_t;

 #endif /* !__ASSEMBLY__ */

 #define kern_addr_valid(addr)	(1)

 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)		\
 		remap_pfn_range(vma, vaddr, pfn, size, prot)

 #define MK_IOSPACE_PFN(space, pfn)	(pfn)
 #define GET_IOSPACE(pfn)		0
 #define GET_PFN(pfn)			(pfn)

 /*
  * No page table caches to initialise
  */
 #define pgtable_cache_init()	do { } while (0)

 #ifndef CONFIG_MMU
 extern unsigned int kobjsize(const void *objp);
 #endif /* !CONFIG_MMU */

 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
 #endif

 #include <asm-generic/pgtable.h>

 #endif /* __ASM_SH_PAGE_H */
	#ifndef __ASM_SH_PGTABLE_H
	#define __ASM_SH_PGTABLE_H

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

	/*
	* Copyright (C) 1999 Niibe Yutaka
	* Copyright (C) 2002, 2003, 2004 Paul Mundt
	*/

	#include <linux/config.h>
	#include <asm/pgtable-2level.h>

	/*
	* This file contains the functions and defines necessary to modify and use
	* the SuperH page table tree.
	*/
	#ifndef __ASSEMBLY__
	#include <asm/processor.h>
	#include <asm/addrspace.h>
	#include <asm/fixmap.h>
	#include <linux/threads.h>

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

	/*
	* Basically we have the same two-level (which is the logical three level
	* Linux page table layout folded) page tables as the i386.
	*/

	/*
	* 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__ */

	#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 0

	#define PTE_PHYS_MASK 0x1ffff000

	#ifndef __ASSEMBLY__
	/*
	* First 1MB map is used by fixed purpose.
	* Currently only 4-enty (16kB) is used (see arch/sh/mm/cache.c)
	*/
	#define VMALLOC_START (P3SEG+0x00100000)
	#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)

	#define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */
	#define _PAGE_HW_SHARED 0x002 /* SH-bit : page is shared among processes */
	#define _PAGE_DIRTY 0x004 /* D-bit : page changed */
	#define _PAGE_CACHABLE 0x008 /* C-bit : cachable */
	#define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */
	#define _PAGE_RW 0x020 /* PR0-bit : write access allowed */
	#define _PAGE_USER 0x040 /* PR1-bit : user space access allowed */
	#define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */
	#define _PAGE_PRESENT 0x100 /* V-bit : page is valid */
	#define _PAGE_PROTNONE 0x200 /* software: if not present */
	#define _PAGE_ACCESSED 0x400 /* software: page referenced */
	#define _PAGE_U0_SHARED 0x800 /* software: page is shared in user space */

	#define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */

	/* software: moves to PTEA.TC (Timing Control) */
	#define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */
	#define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */

	/* software: moves to PTEA.SA[2:0] (Space Attributes) */
	#define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */
	#define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */
	#define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */
	#define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */
	#define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */
	#define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */
	#define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */


	/* Mask which drop software flags
	* We also drop WT bit since it is used for _PAGE_FILE
	* bit in this implementation.
	*/
	#define _PAGE_CLEAR_FLAGS (_PAGE_WT \| _PAGE_PROTNONE \| _PAGE_ACCESSED \| _PAGE_U0_SHARED)

	#if defined(CONFIG_CPU_SH3)
	/*
	* MMU on SH-3 has bug on SH-bit: We can't use it if MMUCR.IX=1.
	* Work around: Just drop SH-bit.
	*/
	#define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS \| _PAGE_HW_SHARED))
	#else
	#define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS))
	#endif

	/* Hardware flags: SZ0=1 (4k-byte) */
	#define _PAGE_FLAGS_HARD _PAGE_SZ0

	#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
	#define _PAGE_SZHUGE (_PAGE_SZ1)
	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
	#define _PAGE_SZHUGE (_PAGE_SZ0 \| _PAGE_SZ1)
	#endif

	#define _PAGE_SHARED _PAGE_U0_SHARED

	#define _PAGE_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	#define _PAGE_CHG_MASK (PTE_MASK \| _PAGE_ACCESSED \| _PAGE_CACHABLE \| _PAGE_DIRTY \| _PAGE_SHARED)

	#ifdef CONFIG_MMU
	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_CACHABLE \|_PAGE_ACCESSED \| _PAGE_FLAGS_HARD)
	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_CACHABLE \|_PAGE_ACCESSED \| _PAGE_SHARED \| _PAGE_FLAGS_HARD)
	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_CACHABLE \| _PAGE_ACCESSED \| _PAGE_FLAGS_HARD)
	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_CACHABLE \| _PAGE_ACCESSED \| _PAGE_FLAGS_HARD)
	#define PAGE_KERNEL __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_CACHABLE \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_HW_SHARED \| _PAGE_FLAGS_HARD)
	#define PAGE_KERNEL_NOCACHE \
	__pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_HW_SHARED \| _PAGE_FLAGS_HARD)
	#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT \| _PAGE_CACHABLE \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_HW_SHARED \| _PAGE_FLAGS_HARD)
	#define PAGE_KERNEL_PCC(slot, type) \
	__pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_FLAGS_HARD \| (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) \| (type))
	#else /* no mmu */
	#define PAGE_NONE __pgprot(0)
	#define PAGE_SHARED __pgprot(0)
	#define PAGE_COPY __pgprot(0)
	#define PAGE_READONLY __pgprot(0)
	#define PAGE_KERNEL __pgprot(0)
	#define PAGE_KERNEL_NOCACHE __pgprot(0)
	#define PAGE_KERNEL_RO __pgprot(0)
	#define PAGE_KERNEL_PCC __pgprot(0)
	#endif

	/*
	* As i386 and MIPS, SuperH can't do page protection for execute, and
	* considers that the same as a read. Also, write permissions imply
	* read permissions. This is the closest 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

	#define pte_none(x) (!pte_val(x))
	#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 & ~_PAGE_USER)) != _KERNPG_TABLE)

	#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
	#define pte_page(x) phys_to_page(pte_val(x)&PTE_PHYS_MASK)

	/*
	* The following only work if pte_present() is true.
	* Undefined behaviour if not..
	*/
	static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
	static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
	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_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
	static inline int pte_not_present(pte_t pte){ return !(pte_val(pte) & _PAGE_PRESENT); }

	static inline pte_t pte_rdprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
	static inline pte_t pte_exprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
	static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
	static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
	static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
	static inline pte_t pte_mkread(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_USER)); return pte; }
	static inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_USER)); return pte; }
	static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_DIRTY)); return pte; }
	static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_ACCESSED)); return pte; }
	static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_RW)); return pte; }
	static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_SZHUGE)); return pte; }

	/*
	* Macro and implementation to make a page protection as uncachable.
	*/
	#define pgprot_noncached pgprot_noncached

	static inline pgprot_t pgprot_noncached(pgprot_t _prot)
	{
	unsigned long prot = pgprot_val(_prot);

	prot &= ~_PAGE_CACHABLE;
	return __pgprot(prot);
	}

	#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)

	/*
	* Conversion functions: convert a page and protection to a page entry,
	* and a page entry and page directory to the page they refer to.
	*
	* extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
	*/
	#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; }

	#define page_pte(page) page_pte_prot(page, __pgprot(0))

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

	#define pmd_page(pmd) \
	(phys_to_page(pmd_val(pmd)))

	/* 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)

	/* Find an entry in the third-level page table.. */
	#define pte_index(address) \
	((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
	#define pte_offset_kernel(dir, address) \
	((pte_t ) pmd_page_kernel((dir)) + pte_index(address))
	#define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
	#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
	#define pte_unmap(pte) do { } while (0)
	#define pte_unmap_nested(pte) do { } while (0)

	struct vm_area_struct;
	extern void update_mmu_cache(struct vm_area_struct * vma,
	unsigned long address, pte_t pte);

	/* Encode and de-code a swap entry */
	/*
	* NOTE: We should set ZEROs at the position of _PAGE_PRESENT
	* and _PAGE_PROTNONE bits
	*/
	#define __swp_type(x) ((x).val & 0xff)
	#define __swp_offset(x) ((x).val >> 10)
	#define __swp_entry(type, offset) ((swp_entry_t) { (type) \| ((offset) << 10) })
	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 })
	#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 })

	/*
	* Encode and decode a nonlinear file mapping entry
	*/
	#define PTE_FILE_MAX_BITS 29
	#define pte_to_pgoff(pte) (pte_val(pte) >> 1)
	#define pgoff_to_pte(off) ((pte_t) { ((off) << 1) \| _PAGE_FILE })

	typedef pte_t *pte_addr_t;

	#endif /* !__ASSEMBLY__ */

	#define kern_addr_valid(addr) (1)

	#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
	remap_pfn_range(vma, vaddr, pfn, size, prot)

	#define MK_IOSPACE_PFN(space, pfn) (pfn)
	#define GET_IOSPACE(pfn) 0
	#define GET_PFN(pfn) (pfn)

	/*
	* No page table caches to initialise
	*/
	#define pgtable_cache_init() do { } while (0)

	#ifndef CONFIG_MMU
	extern unsigned int kobjsize(const void *objp);
	#endif /* !CONFIG_MMU */

	#if defined(CONFIG_CPU_SH4) \|\| defined(CONFIG_SH7705_CACHE_32KB)
	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
	extern pte_t ptep_get_and_clear(struct mm_struct mm, unsigned long addr, pte_t ptep);
	#endif

	#include <asm-generic/pgtable.h>

	#endif /* __ASM_SH_PAGE_H */