[linux-2.6-block.git] / arch / mips / include / asm / pgtable.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2003 Ralf Baechle
 */
#ifndef _ASM_PGTABLE_H
#define _ASM_PGTABLE_H

#ifdef CONFIG_32BIT
#include <asm/pgtable-32.h>
#endif
#ifdef CONFIG_64BIT
#include <asm/pgtable-64.h>
#endif

#include <asm/io.h>
#include <asm/pgtable-bits.h>

struct mm_struct;
struct vm_area_struct;

#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
				 _page_cachable_default)
#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_READ | \
				 _page_cachable_default)
#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_READ | \
				 _page_cachable_default)
#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
				 _PAGE_GLOBAL | _page_cachable_default)
#define PAGE_USERIO	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
				 _page_cachable_default)
#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
			__WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)

/*
 * MIPS can't do page protection for execute, and considers that the same like
 * read. Also, write permissions imply read permissions. This is the closest
 * we can get by reasonable means..
 */

/*
 * Dummy values to fill the table in mmap.c
 * The real values will be generated at runtime
 */
#define __P000 __pgprot(0)
#define __P001 __pgprot(0)
#define __P010 __pgprot(0)
#define __P011 __pgprot(0)
#define __P100 __pgprot(0)
#define __P101 __pgprot(0)
#define __P110 __pgprot(0)
#define __P111 __pgprot(0)

#define __S000 __pgprot(0)
#define __S001 __pgprot(0)
#define __S010 __pgprot(0)
#define __S011 __pgprot(0)
#define __S100 __pgprot(0)
#define __S101 __pgprot(0)
#define __S110 __pgprot(0)
#define __S111 __pgprot(0)

extern unsigned long _page_cachable_default;

/*
 * ZERO_PAGE is a global shared page that is always zero; used
 * for zero-mapped memory areas etc..
 */

extern unsigned long empty_zero_page;
extern unsigned long zero_page_mask;

#define ZERO_PAGE(vaddr) \
	(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))

#define is_zero_pfn is_zero_pfn
static inline int is_zero_pfn(unsigned long pfn)
{
	extern unsigned long zero_pfn;
	unsigned long offset_from_zero_pfn = pfn - zero_pfn;
	return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
}

#define my_zero_pfn(addr)	page_to_pfn(ZERO_PAGE(addr))

extern void paging_init(void);

/*
 * 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 pmd_phys(pmd)		virt_to_phys((void *)pmd_val(pmd))
#define pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#define pmd_page_vaddr(pmd)	pmd_val(pmd)

#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)

#define pte_none(pte)		(!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
#define pte_present(pte)	((pte).pte_low & _PAGE_PRESENT)

static inline void set_pte(pte_t *ptep, pte_t pte)
{
	ptep->pte_high = pte.pte_high;
	smp_wmb();
	ptep->pte_low = pte.pte_low;
	//printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);

	if (pte.pte_low & _PAGE_GLOBAL) {
		pte_t *buddy = ptep_buddy(ptep);
		/*
		 * Make sure the buddy is global too (if it's !none,
		 * it better already be global)
		 */
		if (pte_none(*buddy)) {
			buddy->pte_low  |= _PAGE_GLOBAL;
			buddy->pte_high |= _PAGE_GLOBAL;
		}
	}
}
#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)

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

	/* Preserve global status for the pair */
	if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
		null.pte_low = null.pte_high = _PAGE_GLOBAL;

	set_pte_at(mm, addr, ptep, null);
}
#else

#define pte_none(pte)		(!(pte_val(pte) & ~_PAGE_GLOBAL))
#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)

/*
 * Certain architectures need to do special things when pte's
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */
static inline void set_pte(pte_t *ptep, pte_t pteval)
{
	*ptep = pteval;
#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	if (pte_val(pteval) & _PAGE_GLOBAL) {
		pte_t *buddy = ptep_buddy(ptep);
		/*
		 * Make sure the buddy is global too (if it's !none,
		 * it better already be global)
		 */
		if (pte_none(*buddy))
			pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
	}
#endif
}
#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)

static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	/* Preserve global status for the pair */
	if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
		set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
	else
#endif
		set_pte_at(mm, addr, ptep, __pte(0));
}
#endif

/*
 * (pmds are folded into puds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)

#ifdef CONFIG_64BIT
/*
 * (puds are folded into pgds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
#endif

#define PGD_T_LOG2	(__builtin_ffs(sizeof(pgd_t)) - 1)
#define PMD_T_LOG2	(__builtin_ffs(sizeof(pmd_t)) - 1)
#define PTE_T_LOG2	(__builtin_ffs(sizeof(pte_t)) - 1)

/*
 * We used to declare this array with size but gcc 3.3 and older are not able
 * to find that this expression is a constant, so the size is dropped.
 */
extern pgd_t swapper_pg_dir[];

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
static inline int pte_write(pte_t pte)	{ return pte.pte_low & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte)	{ return pte.pte_low & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte)	{ return pte.pte_low & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte)	{ return pte.pte_low & _PAGE_FILE; }

static inline pte_t pte_wrprotect(pte_t pte)
{
	pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
	pte.pte_high &= ~_PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
	pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
	pte.pte_high &= ~_PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
	pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
	pte.pte_high &= ~_PAGE_SILENT_READ;
	return pte;
}

static inline pte_t pte_mkwrite(pte_t pte)
{
	pte.pte_low |= _PAGE_WRITE;
	if (pte.pte_low & _PAGE_MODIFIED) {
		pte.pte_low  |= _PAGE_SILENT_WRITE;
		pte.pte_high |= _PAGE_SILENT_WRITE;
	}
	return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
	pte.pte_low |= _PAGE_MODIFIED;
	if (pte.pte_low & _PAGE_WRITE) {
		pte.pte_low  |= _PAGE_SILENT_WRITE;
		pte.pte_high |= _PAGE_SILENT_WRITE;
	}
	return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	pte.pte_low |= _PAGE_ACCESSED;
	if (pte.pte_low & _PAGE_READ) {
		pte.pte_low  |= _PAGE_SILENT_READ;
		pte.pte_high |= _PAGE_SILENT_READ;
	}
	return pte;
}
#else
static inline int pte_write(pte_t pte)	{ return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte)	{ return pte_val(pte) & _PAGE_MODIFIED; }
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 pte_t pte_wrprotect(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
	return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
	return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
	return pte;
}

static inline pte_t pte_mkwrite(pte_t pte)
{
	pte_val(pte) |= _PAGE_WRITE;
	if (pte_val(pte) & _PAGE_MODIFIED)
		pte_val(pte) |= _PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
	pte_val(pte) |= _PAGE_MODIFIED;
	if (pte_val(pte) & _PAGE_WRITE)
		pte_val(pte) |= _PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	pte_val(pte) |= _PAGE_ACCESSED;
	if (pte_val(pte) & _PAGE_READ)
		pte_val(pte) |= _PAGE_SILENT_READ;
	return pte;
}

#ifdef _PAGE_HUGE
static inline int pte_huge(pte_t pte)	{ return pte_val(pte) & _PAGE_HUGE; }

static inline pte_t pte_mkhuge(pte_t pte)
{
	pte_val(pte) |= _PAGE_HUGE;
	return pte;
}
#endif /* _PAGE_HUGE */
#endif
static inline int pte_special(pte_t pte)	{ return 0; }
static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }

/*
 * Macro to make mark a page protection value as "uncacheable".  Note
 * that "protection" is really a misnomer here as the protection value
 * contains the memory attribute bits, dirty bits, and various other
 * bits as well.
 */
#define pgprot_noncached pgprot_noncached

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

	prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;

	return __pgprot(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))

#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	pte.pte_low  &= _PAGE_CHG_MASK;
	pte.pte_high &= ~0x3f;
	pte.pte_low  |= pgprot_val(newprot);
	pte.pte_high |= pgprot_val(newprot) & 0x3f;
	return pte;
}
#else
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
}
#endif


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

static inline void update_mmu_cache(struct vm_area_struct *vma,
	unsigned long address, pte_t pte)
{
	__update_tlb(vma, address, pte);
	__update_cache(vma, address, pte);
}

#define kern_addr_valid(addr)	(1)

#ifdef CONFIG_64BIT_PHYS_ADDR
extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);

static inline int io_remap_pfn_range(struct vm_area_struct *vma,
		unsigned long vaddr,
		unsigned long pfn,
		unsigned long size,
		pgprot_t prot)
{
	phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
	return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
}
#else
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)		\
		remap_pfn_range(vma, vaddr, pfn, size, prot)
#endif

#include <asm-generic/pgtable.h>

/*
 * We provide our own get_unmapped area to cope with the virtual aliasing
 * constraints placed on us by the cache architecture.
 */
#define HAVE_ARCH_UNMAPPED_AREA

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

#endif /* _ASM_PGTABLE_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 2003 Ralf Baechle
	7	*/
	8	#ifndef _ASM_PGTABLE_H
	9	#define _ASM_PGTABLE_H
	10
875d43e7	11	#ifdef CONFIG_32BIT
1da177e4 LT	12	#include <asm/pgtable-32.h>
1da177e4 LT	13	#endif
875d43e7	14	#ifdef CONFIG_64BIT
1da177e4 LT	15	#include <asm/pgtable-64.h>
	16	#endif
	17
f10fae02	18	#include <asm/io.h>
1da177e4 LT	19	#include <asm/pgtable-bits.h>
1da177e4 LT	20
8c65b4a6 TS	21	struct mm_struct;
	22	struct vm_area_struct;
	23
1da177e4 LT	24	#define PAGE_NONE __pgprot(_PAGE_PRESENT \| _CACHE_CACHABLE_NONCOHERENT)
1da177e4 LT	25	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_READ \| _PAGE_WRITE \| \
35133692	26	_page_cachable_default)
1da177e4	27	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| _PAGE_READ \| \
35133692	28	_page_cachable_default)
1da177e4	29	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_READ \| \
35133692	30	_page_cachable_default)
1da177e4	31	#define PAGE_KERNEL __pgprot(_PAGE_PRESENT \| __READABLE \| __WRITEABLE \| \
35133692	32	_PAGE_GLOBAL \| _page_cachable_default)
1da177e4	33	#define PAGE_USERIO __pgprot(_PAGE_PRESENT \| _PAGE_READ \| _PAGE_WRITE \| \
35133692	34	_page_cachable_default)
1da177e4 LT	35	#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT \| __READABLE \| \
	36	__WRITEABLE \| _PAGE_GLOBAL \| _CACHE_UNCACHED)
	37
	38	/*
	39	* MIPS can't do page protection for execute, and considers that the same like
	40	* read. Also, write permissions imply read permissions. This is the closest
	41	* we can get by reasonable means..
	42	*/
1da177e4	43
35133692 CD	44	/*
	45	* Dummy values to fill the table in mmap.c
	46	* The real values will be generated at runtime
	47	*/
	48	#define __P000 __pgprot(0)
	49	#define __P001 __pgprot(0)
	50	#define __P010 __pgprot(0)
	51	#define __P011 __pgprot(0)
	52	#define __P100 __pgprot(0)
	53	#define __P101 __pgprot(0)
	54	#define __P110 __pgprot(0)
	55	#define __P111 __pgprot(0)
	56
	57	#define __S000 __pgprot(0)
	58	#define __S001 __pgprot(0)
	59	#define __S010 __pgprot(0)
	60	#define __S011 __pgprot(0)
	61	#define __S100 __pgprot(0)
	62	#define __S101 __pgprot(0)
	63	#define __S110 __pgprot(0)
	64	#define __S111 __pgprot(0)
	65
	66	extern unsigned long _page_cachable_default;
1da177e4 LT	67
	68	/*
	69	* ZERO_PAGE is a global shared page that is always zero; used
	70	* for zero-mapped memory areas etc..
	71	*/
	72
	73	extern unsigned long empty_zero_page;
	74	extern unsigned long zero_page_mask;
	75
	76	#define ZERO_PAGE(vaddr) \
99e3b942	77	(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
1da177e4	78
62eede62 HD	79	#define is_zero_pfn is_zero_pfn
	80	static inline int is_zero_pfn(unsigned long pfn)
	81	{
	82	extern unsigned long zero_pfn;
	83	unsigned long offset_from_zero_pfn = pfn - zero_pfn;
	84	return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
	85	}
	86
	87	#define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr))
	88
1da177e4 LT	89	extern void paging_init(void);
	90
	91	/*
	92	* Conversion functions: convert a page and protection to a page entry,
	93	* and a page entry and page directory to the page they refer to.
	94	*/
c9d06962	95	#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
1da177e4	96	#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
46a82b2d	97	#define pmd_page_vaddr(pmd) pmd_val(pmd)
1da177e4	98
962f480e	99	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
6e953891 SS	100
	101	#define pte_none(pte) (!(((pte).pte_low \| (pte).pte_high) & ~_PAGE_GLOBAL))
	102	#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
	103
1da177e4 LT	104	static inline void set_pte(pte_t *ptep, pte_t pte)
	105	{
	106	ptep->pte_high = pte.pte_high;
	107	smp_wmb();
	108	ptep->pte_low = pte.pte_low;
	109	//printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
	110
6e953891	111	if (pte.pte_low & _PAGE_GLOBAL) {
1da177e4 LT	112	pte_t *buddy = ptep_buddy(ptep);
	113	/*
	114	* Make sure the buddy is global too (if it's !none,
	115	* it better already be global)
	116	*/
6e953891 SS	117	if (pte_none(*buddy)) {
	118	buddy->pte_low \|= _PAGE_GLOBAL;
	119	buddy->pte_high \|= _PAGE_GLOBAL;
	120	}
1da177e4 LT	121	}
1da177e4 LT	122	}
21a151d8	123	#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
1da177e4 LT	124
	125	static inline void pte_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
	126	{
6e953891 SS	127	pte_t null = __pte(0);
6e953891 SS	128
1da177e4	129	/* Preserve global status for the pair */
6e953891 SS	130	if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
	131	null.pte_low = null.pte_high = _PAGE_GLOBAL;
	132
	133	set_pte_at(mm, addr, ptep, null);
1da177e4 LT	134	}
1da177e4 LT	135	#else
6e953891 SS	136
	137	#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
	138	#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
	139
1da177e4 LT	140	/*
	141	* Certain architectures need to do special things when pte's
	142	* within a page table are directly modified. Thus, the following
	143	* hook is made available.
	144	*/
	145	static inline void set_pte(pte_t *ptep, pte_t pteval)
	146	{
	147	*ptep = pteval;
	148	#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	149	if (pte_val(pteval) & _PAGE_GLOBAL) {
	150	pte_t *buddy = ptep_buddy(ptep);
	151	/*
	152	* Make sure the buddy is global too (if it's !none,
	153	* it better already be global)
	154	*/
	155	if (pte_none(*buddy))
	156	pte_val(buddy) = pte_val(buddy) \| _PAGE_GLOBAL;
	157	}
	158	#endif
	159	}
21a151d8	160	#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
1da177e4 LT	161
	162	static inline void pte_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
	163	{
	164	#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	165	/* Preserve global status for the pair */
	166	if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
	167	set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
	168	else
	169	#endif
	170	set_pte_at(mm, addr, ptep, __pte(0));
	171	}
	172	#endif
	173
	174	/*
c6e8b587	175	* (pmds are folded into puds so this doesn't get actually called,
1da177e4 LT	176	* but the define is needed for a generic inline function.)
	177	*/
	178	#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
c6e8b587 RB	179
	180	#ifdef CONFIG_64BIT
	181	/*
	182	* (puds are folded into pgds so this doesn't get actually called,
	183	* but the define is needed for a generic inline function.)
	184	*/
	185	#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
	186	#endif
1da177e4	187
5ff97472 RB	188	#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
	189	#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
	190	#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
1da177e4	191
9975e77d RB	192	/*
	193	* We used to declare this array with size but gcc 3.3 and older are not able
	194	* to find that this expression is a constant, so the size is dropped.
	195	*/
	196	extern pgd_t swapper_pg_dir[];
1da177e4 LT	197
	198	/*
	199	* The following only work if pte_present() is true.
	200	* Undefined behaviour if not..
	201	*/
962f480e	202	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
6e953891 SS	203	static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
	204	static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
	205	static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
	206	static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
	207
1da177e4 LT	208	static inline pte_t pte_wrprotect(pte_t pte)
1da177e4 LT	209	{
6e953891 SS	210	pte.pte_low &= ~(_PAGE_WRITE \| _PAGE_SILENT_WRITE);
6e953891 SS	211	pte.pte_high &= ~_PAGE_SILENT_WRITE;
1da177e4 LT	212	return pte;
	213	}
	214
1da177e4 LT	215	static inline pte_t pte_mkclean(pte_t pte)
1da177e4 LT	216	{
6e953891 SS	217	pte.pte_low &= ~(_PAGE_MODIFIED \| _PAGE_SILENT_WRITE);
6e953891 SS	218	pte.pte_high &= ~_PAGE_SILENT_WRITE;
1da177e4 LT	219	return pte;
	220	}
	221
	222	static inline pte_t pte_mkold(pte_t pte)
	223	{
6e953891 SS	224	pte.pte_low &= ~(_PAGE_ACCESSED \| _PAGE_SILENT_READ);
6e953891 SS	225	pte.pte_high &= ~_PAGE_SILENT_READ;
1da177e4 LT	226	return pte;
	227	}
	228
	229	static inline pte_t pte_mkwrite(pte_t pte)
	230	{
6e953891 SS	231	pte.pte_low \|= _PAGE_WRITE;
	232	if (pte.pte_low & _PAGE_MODIFIED) {
	233	pte.pte_low \|= _PAGE_SILENT_WRITE;
	234	pte.pte_high \|= _PAGE_SILENT_WRITE;
1da177e4 LT	235	}
	236	return pte;
	237	}
	238
1da177e4 LT	239	static inline pte_t pte_mkdirty(pte_t pte)
1da177e4 LT	240	{
6e953891 SS	241	pte.pte_low \|= _PAGE_MODIFIED;
	242	if (pte.pte_low & _PAGE_WRITE) {
	243	pte.pte_low \|= _PAGE_SILENT_WRITE;
	244	pte.pte_high \|= _PAGE_SILENT_WRITE;
1da177e4 LT	245	}
	246	return pte;
	247	}
	248
	249	static inline pte_t pte_mkyoung(pte_t pte)
	250	{
6e953891	251	pte.pte_low \|= _PAGE_ACCESSED;
057229f9	252	if (pte.pte_low & _PAGE_READ) {
6e953891 SS	253	pte.pte_low \|= _PAGE_SILENT_READ;
6e953891 SS	254	pte.pte_high \|= _PAGE_SILENT_READ;
057229f9	255	}
1da177e4 LT	256	return pte;
	257	}
	258	#else
1da177e4 LT	259	static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
	260	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
	261	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
	262	static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
	263
	264	static inline pte_t pte_wrprotect(pte_t pte)
	265	{
	266	pte_val(pte) &= ~(_PAGE_WRITE \| _PAGE_SILENT_WRITE);
	267	return pte;
	268	}
	269
1da177e4 LT	270	static inline pte_t pte_mkclean(pte_t pte)
	271	{
	272	pte_val(pte) &= ~(_PAGE_MODIFIED\|_PAGE_SILENT_WRITE);
	273	return pte;
	274	}
	275
	276	static inline pte_t pte_mkold(pte_t pte)
	277	{
	278	pte_val(pte) &= ~(_PAGE_ACCESSED\|_PAGE_SILENT_READ);
	279	return pte;
	280	}
	281
	282	static inline pte_t pte_mkwrite(pte_t pte)
	283	{
	284	pte_val(pte) \|= _PAGE_WRITE;
	285	if (pte_val(pte) & _PAGE_MODIFIED)
	286	pte_val(pte) \|= _PAGE_SILENT_WRITE;
	287	return pte;
	288	}
	289
1da177e4 LT	290	static inline pte_t pte_mkdirty(pte_t pte)
	291	{
	292	pte_val(pte) \|= _PAGE_MODIFIED;
	293	if (pte_val(pte) & _PAGE_WRITE)
	294	pte_val(pte) \|= _PAGE_SILENT_WRITE;
	295	return pte;
	296	}
	297
	298	static inline pte_t pte_mkyoung(pte_t pte)
	299	{
	300	pte_val(pte) \|= _PAGE_ACCESSED;
	301	if (pte_val(pte) & _PAGE_READ)
	302	pte_val(pte) \|= _PAGE_SILENT_READ;
	303	return pte;
	304	}
dd794392 DD	305
	306	#ifdef _PAGE_HUGE
	307	static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
	308
	309	static inline pte_t pte_mkhuge(pte_t pte)
	310	{
	311	pte_val(pte) \|= _PAGE_HUGE;
	312	return pte;
	313	}
	314	#endif /* _PAGE_HUGE */
1da177e4	315	#endif
7e675137 NP	316	static inline int pte_special(pte_t pte) { return 0; }
7e675137 NP	317	static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
1da177e4 LT	318
	319	/*
	320	* Macro to make mark a page protection value as "uncacheable". Note
	321	* that "protection" is really a misnomer here as the protection value
	322	* contains the memory attribute bits, dirty bits, and various other
	323	* bits as well.
	324	*/
	325	#define pgprot_noncached pgprot_noncached
	326
	327	static inline pgprot_t pgprot_noncached(pgprot_t _prot)
	328	{
	329	unsigned long prot = pgprot_val(_prot);
	330
	331	prot = (prot & ~_CACHE_MASK) \| _CACHE_UNCACHED;
	332
	333	return __pgprot(prot);
	334	}
	335
	336	/*
	337	* Conversion functions: convert a page and protection to a page entry,
	338	* and a page entry and page directory to the page they refer to.
	339	*/
	340	#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
	341
962f480e	342	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
1da177e4 LT	343	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
1da177e4 LT	344	{
79e0bc37 SS	345	pte.pte_low &= _PAGE_CHG_MASK;
	346	pte.pte_high &= ~0x3f;
	347	pte.pte_low \|= pgprot_val(newprot);
1da177e4 LT	348	pte.pte_high \|= pgprot_val(newprot) & 0x3f;
	349	return pte;
	350	}
	351	#else
	352	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	353	{
	354	return __pte((pte_val(pte) & _PAGE_CHG_MASK) \| pgprot_val(newprot));
	355	}
	356	#endif
	357
	358
	359	extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
	360	pte_t pte);
	361	extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
	362	pte_t pte);
	363
	364	static inline void update_mmu_cache(struct vm_area_struct *vma,
	365	unsigned long address, pte_t pte)
	366	{
	367	__update_tlb(vma, address, pte);
	368	__update_cache(vma, address, pte);
	369	}
	370
1da177e4	371	#define kern_addr_valid(addr) (1)
1da177e4 LT	372
1da177e4 LT	373	#ifdef CONFIG_64BIT_PHYS_ADDR
1da177e4 LT	374	extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
1da177e4 LT	375
1da177e4 LT	376	static inline int io_remap_pfn_range(struct vm_area_struct *vma,
	377	unsigned long vaddr,
	378	unsigned long pfn,
	379	unsigned long size,
	380	pgprot_t prot)
	381	{
	382	phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
ac5d8c02	383	return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
1da177e4 LT	384	}
1da177e4 LT	385	#else
1da177e4 LT	386	#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
	387	remap_pfn_range(vma, vaddr, pfn, size, prot)
	388	#endif
	389
1da177e4 LT	390	#include <asm-generic/pgtable.h>
	391
	392	/*
	393	* We provide our own get_unmapped area to cope with the virtual aliasing
	394	* constraints placed on us by the cache architecture.
	395	*/
	396	#define HAVE_ARCH_UNMAPPED_AREA
	397
	398	/*
	399	* No page table caches to initialise
	400	*/
	401	#define pgtable_cache_init() do { } while (0)
	402
	403	#endif /* _ASM_PGTABLE_H */