[linux-block.git] / include / asm-um / pgtable.h

/* 
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Copyright 2003 PathScale, Inc.
 * Derived from include/asm-i386/pgtable.h
 * Licensed under the GPL
 */

#ifndef __UM_PGTABLE_H
#define __UM_PGTABLE_H

#include <asm/fixmap.h>

#define _PAGE_PRESENT	0x001
#define _PAGE_NEWPAGE	0x002
#define _PAGE_NEWPROT	0x004
#define _PAGE_RW	0x020
#define _PAGE_USER	0x040
#define _PAGE_ACCESSED	0x080
#define _PAGE_DIRTY	0x100
/* If _PAGE_PRESENT is clear, we use these: */
#define _PAGE_FILE	0x008	/* nonlinear file mapping, saved PTE; unset:swap */
#define _PAGE_PROTNONE	0x010	/* if the user mapped it with PROT_NONE;
				   pte_present gives true */

#ifdef CONFIG_3_LEVEL_PGTABLES
#include "asm/pgtable-3level.h"
#else
#include "asm/pgtable-2level.h"
#endif

extern pgd_t swapper_pg_dir[PTRS_PER_PGD];

/* zero page used for uninitialized stuff */
extern unsigned long *empty_zero_page;

#define pgtable_cache_init() do ; while (0)

/* 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. ;)
 */

extern unsigned long end_iomem;

#define VMALLOC_OFFSET	(__va_space)
#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
#ifdef CONFIG_HIGHMEM
# define VMALLOC_END	(PKMAP_BASE-2*PAGE_SIZE)
#else
# define VMALLOC_END	(FIXADDR_START-2*PAGE_SIZE)
#endif

#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	(PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)

#define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)

/*
 * The i386 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
#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

/*
 * ZERO_PAGE is a global shared page that is always zero: used
 * for zero-mapped memory areas etc..
 */
#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)

#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))

#define pmd_none(x)	(!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
#define	pmd_bad(x)	((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)

#define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)
#define pmd_clear(xp)	do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)

#define pmd_newpage(x)  (pmd_val(x) & _PAGE_NEWPAGE)
#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)

#define pud_newpage(x)  (pud_val(x) & _PAGE_NEWPAGE)
#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)

#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)

#define pte_page(x) pfn_to_page(pte_pfn(x))

#define pte_present(x)	pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))

/*
 * =================================
 * Flags checking section.
 * =================================
 */

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

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
static inline int pte_read(pte_t pte)
{ 
	return((pte_get_bits(pte, _PAGE_USER)) &&
	       !(pte_get_bits(pte, _PAGE_PROTNONE)));
}

static inline int pte_exec(pte_t pte){
	return((pte_get_bits(pte, _PAGE_USER)) &&
	       !(pte_get_bits(pte, _PAGE_PROTNONE)));
}

static inline int pte_write(pte_t pte)
{
	return((pte_get_bits(pte, _PAGE_RW)) &&
	       !(pte_get_bits(pte, _PAGE_PROTNONE)));
}

/*
 * The following only works if pte_present() is not true.
 */
static inline int pte_file(pte_t pte)
{
	return pte_get_bits(pte, _PAGE_FILE);
}

static inline int pte_dirty(pte_t pte)
{
	return pte_get_bits(pte, _PAGE_DIRTY);
}

static inline int pte_young(pte_t pte)
{
	return pte_get_bits(pte, _PAGE_ACCESSED);
}

static inline int pte_newpage(pte_t pte)
{
	return pte_get_bits(pte, _PAGE_NEWPAGE);
}

static inline int pte_newprot(pte_t pte)
{ 
	return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
}

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

/*
 * =================================
 * Flags setting section.
 * =================================
 */

static inline pte_t pte_mknewprot(pte_t pte)
{
	pte_set_bits(pte, _PAGE_NEWPROT);
	return(pte);
}

static inline pte_t pte_mkclean(pte_t pte)
{
	pte_clear_bits(pte, _PAGE_DIRTY);
	return(pte);
}

static inline pte_t pte_mkold(pte_t pte)	
{ 
	pte_clear_bits(pte, _PAGE_ACCESSED);
	return(pte);
}

static inline pte_t pte_wrprotect(pte_t pte)
{ 
	pte_clear_bits(pte, _PAGE_RW);
	return(pte_mknewprot(pte)); 
}

static inline pte_t pte_mkread(pte_t pte)
{ 
	pte_set_bits(pte, _PAGE_USER);
	return(pte_mknewprot(pte)); 
}

static inline pte_t pte_mkdirty(pte_t pte)
{ 
	pte_set_bits(pte, _PAGE_DIRTY);
	return(pte);
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	pte_set_bits(pte, _PAGE_ACCESSED);
	return(pte);
}

static inline pte_t pte_mkwrite(pte_t pte)	
{
	pte_set_bits(pte, _PAGE_RW);
	return(pte_mknewprot(pte)); 
}

static inline pte_t pte_mkuptodate(pte_t pte)	
{
	pte_clear_bits(pte, _PAGE_NEWPAGE);
	if(pte_present(pte))
		pte_clear_bits(pte, _PAGE_NEWPROT);
	return(pte); 
}

static inline pte_t pte_mknewpage(pte_t pte)
{
	pte_set_bits(pte, _PAGE_NEWPAGE);
	return(pte);
}

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

static inline void set_pte(pte_t *pteptr, pte_t pteval)
{
	pte_copy(*pteptr, pteval);

	/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
	 * fix_range knows to unmap it.  _PAGE_NEWPROT is specific to
	 * mapped pages.
	 */

	*pteptr = pte_mknewpage(*pteptr);
	if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
}
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

/*
 * 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 phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
#define __virt_to_page(virt) phys_to_page(__pa(virt))
#define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page))
#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)

#define mk_pte(page, pgprot) \
	({ pte_t pte;					\
							\
	pte_set_val(pte, page_to_phys(page), (pgprot));	\
	if (pte_present(pte))				\
		pte_mknewprot(pte_mknewpage(pte));	\
	pte;})

static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
	return pte; 
}

/*
 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
 *
 * this macro returns the index of the entry in the pgd page which would
 * control the given virtual address
 */
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))

/*
 * pgd_offset() returns a (pgd_t *)
 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 */
#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))

/*
 * a shortcut which implies the use of the kernel's pgd, instead
 * of a process's
 */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)

/*
 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
 *
 * this macro returns the index of the entry in the pmd page which would
 * control the given virtual address
 */
#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))

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

/*
 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 *
 * this macro returns the index of the entry in the pte page which would
 * control the given virtual address
 */
#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_offset_map_nested(dir, address) pte_offset_map(dir, address)
#define pte_unmap(pte) do { } while (0)
#define pte_unmap_nested(pte) do { } while (0)

struct mm_struct;
extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);

#define update_mmu_cache(vma,address,pte) do ; while (0)

/* Encode and de-code a swap entry */
#define __swp_type(x)			(((x).val >> 4) & 0x3f)
#define __swp_offset(x)			((x).val >> 11)

#define __swp_entry(type, offset) \
	((swp_entry_t) { ((type) << 4) | ((offset) << 11) })
#define __pte_to_swp_entry(pte) \
	((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
#define __swp_entry_to_pte(x)		((pte_t) { (x).val })

#define kern_addr_valid(addr) (1)

#include <asm-generic/pgtable.h>

#endif
Commit	Line	Data
1da177e4	1	/*
d83ecf08	2	* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
1da177e4 LT	3	* Copyright 2003 PathScale, Inc.
	4	* Derived from include/asm-i386/pgtable.h
	5	* Licensed under the GPL
	6	*/
	7
	8	#ifndef __UM_PGTABLE_H
	9	#define __UM_PGTABLE_H
	10
300ecf59	11	#include <asm/fixmap.h>
1da177e4 LT	12
	13	#define _PAGE_PRESENT 0x001
	14	#define _PAGE_NEWPAGE 0x002
9b4ee40e	15	#define _PAGE_NEWPROT 0x004
1da177e4 LT	16	#define _PAGE_RW 0x020
	17	#define _PAGE_USER 0x040
	18	#define _PAGE_ACCESSED 0x080
	19	#define _PAGE_DIRTY 0x100
9b4ee40e PBG	20	/* If _PAGE_PRESENT is clear, we use these: */
	21	#define _PAGE_FILE 0x008 /* nonlinear file mapping, saved PTE; unset:swap */
	22	#define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE;
	23	pte_present gives true */
1da177e4 LT	24
	25	#ifdef CONFIG_3_LEVEL_PGTABLES
	26	#include "asm/pgtable-3level.h"
	27	#else
	28	#include "asm/pgtable-2level.h"
	29	#endif
	30
	31	extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
	32
1da177e4 LT	33	/* zero page used for uninitialized stuff */
	34	extern unsigned long *empty_zero_page;
	35
	36	#define pgtable_cache_init() do ; while (0)
	37
1da177e4 LT	38	/* Just any arbitrary offset to the start of the vmalloc VM area: the
	39	* current 8MB value just means that there will be a 8MB "hole" after the
	40	* physical memory until the kernel virtual memory starts. That means that
	41	* any out-of-bounds memory accesses will hopefully be caught.
	42	* The vmalloc() routines leaves a hole of 4kB between each vmalloced
	43	* area for the same reason. ;)
	44	*/
	45
	46	extern unsigned long end_iomem;
	47
	48	#define VMALLOC_OFFSET (__va_space)
	49	#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
1da177e4 LT	50	#ifdef CONFIG_HIGHMEM
	51	# define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE)
	52	#else
	53	# define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
	54	#endif
	55
1da177e4 LT	56	#define _PAGE_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	57	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	58	#define _PAGE_CHG_MASK (PAGE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	59
	60	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
	61	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED)
	62	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	63	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	64	#define PAGE_KERNEL __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED)
1da177e4 LT	65
1da177e4 LT	66	/*
d83ecf08 JD	67	* The i386 can't do page protection for execute, and considers that the same
	68	* are read.
	69	* Also, write permissions imply read permissions. This is the closest we can
	70	* get..
1da177e4 LT	71	*/
	72	#define __P000 PAGE_NONE
	73	#define __P001 PAGE_READONLY
	74	#define __P010 PAGE_COPY
	75	#define __P011 PAGE_COPY
	76	#define __P100 PAGE_READONLY
	77	#define __P101 PAGE_READONLY
	78	#define __P110 PAGE_COPY
	79	#define __P111 PAGE_COPY
	80
	81	#define __S000 PAGE_NONE
	82	#define __S001 PAGE_READONLY
	83	#define __S010 PAGE_SHARED
	84	#define __S011 PAGE_SHARED
	85	#define __S100 PAGE_READONLY
	86	#define __S101 PAGE_READONLY
	87	#define __S110 PAGE_SHARED
	88	#define __S111 PAGE_SHARED
	89
1da177e4	90	/*
1da177e4 LT	91	* ZERO_PAGE is a global shared page that is always zero: used
	92	* for zero-mapped memory areas etc..
	93	*/
1da177e4 LT	94	#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
1da177e4 LT	95
1da177e4 LT	96	#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
1da177e4 LT	97
705e87c0	98	#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
1da177e4	99	#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
d83ecf08	100
1da177e4 LT	101	#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
	102	#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
	103
	104	#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE)
	105	#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
	106
	107	#define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE)
	108	#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
	109
1da177e4 LT	110	#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
1da177e4 LT	111
08964c56	112	#define pte_page(x) pfn_to_page(pte_pfn(x))
1da177e4	113
08964c56 JD	114	#define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT \| _PAGE_PROTNONE))
	115
	116	/*
	117	* =================================
	118	* Flags checking section.
	119	* =================================
	120	*/
	121
	122	static inline int pte_none(pte_t pte)
	123	{
	124	return pte_is_zero(pte);
	125	}
	126
1da177e4 LT	127	/*
	128	* The following only work if pte_present() is true.
	129	* Undefined behaviour if not..
	130	*/
1da177e4 LT	131	static inline int pte_read(pte_t pte)
	132	{
	133	return((pte_get_bits(pte, _PAGE_USER)) &&
	134	!(pte_get_bits(pte, _PAGE_PROTNONE)));
	135	}
	136
	137	static inline int pte_exec(pte_t pte){
	138	return((pte_get_bits(pte, _PAGE_USER)) &&
	139	!(pte_get_bits(pte, _PAGE_PROTNONE)));
	140	}
	141
	142	static inline int pte_write(pte_t pte)
	143	{
	144	return((pte_get_bits(pte, _PAGE_RW)) &&
	145	!(pte_get_bits(pte, _PAGE_PROTNONE)));
	146	}
	147
	148	/*
	149	* The following only works if pte_present() is not true.
	150	*/
	151	static inline int pte_file(pte_t pte)
	152	{
	153	return pte_get_bits(pte, _PAGE_FILE);
	154	}
	155
	156	static inline int pte_dirty(pte_t pte)
	157	{
	158	return pte_get_bits(pte, _PAGE_DIRTY);
	159	}
	160
	161	static inline int pte_young(pte_t pte)
	162	{
	163	return pte_get_bits(pte, _PAGE_ACCESSED);
	164	}
	165
	166	static inline int pte_newpage(pte_t pte)
	167	{
	168	return pte_get_bits(pte, _PAGE_NEWPAGE);
	169	}
	170
	171	static inline int pte_newprot(pte_t pte)
	172	{
	173	return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
	174	}
	175
7e675137 NP	176	static inline int pte_special(pte_t pte)
	177	{
	178	return 0;
	179	}
	180
08964c56 JD	181	/*
	182	* =================================
	183	* Flags setting section.
	184	* =================================
	185	*/
	186
	187	static inline pte_t pte_mknewprot(pte_t pte)
	188	{
	189	pte_set_bits(pte, _PAGE_NEWPROT);
	190	return(pte);
	191	}
	192
1da177e4 LT	193	static inline pte_t pte_mkclean(pte_t pte)
	194	{
	195	pte_clear_bits(pte, _PAGE_DIRTY);
	196	return(pte);
	197	}
	198
	199	static inline pte_t pte_mkold(pte_t pte)
	200	{
	201	pte_clear_bits(pte, _PAGE_ACCESSED);
	202	return(pte);
	203	}
	204
	205	static inline pte_t pte_wrprotect(pte_t pte)
	206	{
	207	pte_clear_bits(pte, _PAGE_RW);
	208	return(pte_mknewprot(pte));
	209	}
	210
	211	static inline pte_t pte_mkread(pte_t pte)
	212	{
1463fdbc	213	pte_set_bits(pte, _PAGE_USER);
1da177e4 LT	214	return(pte_mknewprot(pte));
	215	}
	216
1da177e4 LT	217	static inline pte_t pte_mkdirty(pte_t pte)
	218	{
	219	pte_set_bits(pte, _PAGE_DIRTY);
	220	return(pte);
	221	}
	222
	223	static inline pte_t pte_mkyoung(pte_t pte)
	224	{
	225	pte_set_bits(pte, _PAGE_ACCESSED);
	226	return(pte);
	227	}
	228
	229	static inline pte_t pte_mkwrite(pte_t pte)
	230	{
	231	pte_set_bits(pte, _PAGE_RW);
	232	return(pte_mknewprot(pte));
	233	}
	234
	235	static inline pte_t pte_mkuptodate(pte_t pte)
	236	{
	237	pte_clear_bits(pte, _PAGE_NEWPAGE);
	238	if(pte_present(pte))
	239	pte_clear_bits(pte, _PAGE_NEWPROT);
	240	return(pte);
	241	}
	242
08964c56 JD	243	static inline pte_t pte_mknewpage(pte_t pte)
	244	{
	245	pte_set_bits(pte, _PAGE_NEWPAGE);
	246	return(pte);
	247	}
	248
7e675137 NP	249	static inline pte_t pte_mkspecial(pte_t pte)
	250	{
	251	return(pte);
	252	}
	253
08964c56 JD	254	static inline void set_pte(pte_t *pteptr, pte_t pteval)
	255	{
	256	pte_copy(*pteptr, pteval);
	257
	258	/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
	259	* fix_range knows to unmap it. _PAGE_NEWPROT is specific to
	260	* mapped pages.
	261	*/
	262
	263	pteptr = pte_mknewpage(pteptr);
	264	if(pte_present(pteptr)) pteptr = pte_mknewprot(*pteptr);
	265	}
	266	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
	267
1da177e4 LT	268	/*
	269	* Conversion functions: convert a page and protection to a page entry,
	270	* and a page entry and page directory to the page they refer to.
	271	*/
	272
d99c4022 PBG	273	#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
d99c4022 PBG	274	#define __virt_to_page(virt) phys_to_page(__pa(virt))
655e4ed0	275	#define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page))
d83ecf08	276	#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
d99c4022 PBG	277
	278	#define mk_pte(page, pgprot) \
	279	({ pte_t pte; \
	280	\
	281	pte_set_val(pte, page_to_phys(page), (pgprot)); \
	282	if (pte_present(pte)) \
	283	pte_mknewprot(pte_mknewpage(pte)); \
	284	pte;})
1da177e4 LT	285
	286	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	287	{
	288	pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
1da177e4 LT	289	return pte;
	290	}
	291
1da177e4 LT	292	/*
	293	* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
	294	*
	295	* this macro returns the index of the entry in the pgd page which would
	296	* control the given virtual address
	297	*/
	298	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
	299
1da177e4 LT	300	/*
	301	* pgd_offset() returns a (pgd_t *)
	302	* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
	303	*/
	304	#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
	305
	306	/*
	307	* a shortcut which implies the use of the kernel's pgd, instead
	308	* of a process's
	309	*/
	310	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	311
	312	/*
	313	* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
	314	*
	315	* this macro returns the index of the entry in the pmd page which would
	316	* control the given virtual address
	317	*/
300ecf59	318	#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
1da177e4 LT	319	#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
1da177e4 LT	320
909e90d3 JD	321	#define pmd_page_vaddr(pmd) \
	322	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
	323
1da177e4 LT	324	/*
	325	* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
	326	*
	327	* this macro returns the index of the entry in the pte page which would
	328	* control the given virtual address
	329	*/
	330	#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
	331	#define pte_offset_kernel(dir, address) \
46a82b2d	332	((pte_t ) pmd_page_vaddr((dir)) + pte_index(address))
1da177e4 LT	333	#define pte_offset_map(dir, address) \
	334	((pte_t )page_address(pmd_page((dir))) + pte_index(address))
	335	#define pte_offset_map_nested(dir, address) pte_offset_map(dir, address)
	336	#define pte_unmap(pte) do { } while (0)
	337	#define pte_unmap_nested(pte) do { } while (0)
	338
ca77b555 JD	339	struct mm_struct;
	340	extern pte_t virt_to_pte(struct mm_struct mm, unsigned long addr);
	341
1da177e4 LT	342	#define update_mmu_cache(vma,address,pte) do ; while (0)
	343
	344	/* Encode and de-code a swap entry */
	345	#define __swp_type(x) (((x).val >> 4) & 0x3f)
	346	#define __swp_offset(x) ((x).val >> 11)
	347
	348	#define __swp_entry(type, offset) \
	349	((swp_entry_t) { ((type) << 4) \| ((offset) << 11) })
	350	#define __pte_to_swp_entry(pte) \
	351	((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
	352	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	353
	354	#define kern_addr_valid(addr) (1)
	355
	356	#include <asm-generic/pgtable.h>
	357
04add672	358	#endif