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

/* 
 * Copyright (C) 2000, 2001, 2002 Jeff Dike ([email protected])
 * Copyright 2003 PathScale, Inc.
 * Derived from include/asm-i386/pgtable.h
 * Licensed under the GPL
 */

#ifndef __UM_PGTABLE_H
#define __UM_PGTABLE_H

#include "linux/sched.h"
#include "linux/linkage.h"
#include "asm/processor.h"
#include "asm/page.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];

extern void *um_virt_to_phys(struct task_struct *task, unsigned long virt,
			     pte_t *pte_out);

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

#define pgtable_cache_init() do ; while (0)

/*
 * pgd entries used up by user/kernel:
 */

#define USER_PGD_PTRS (TASK_SIZE >> PGDIR_SHIFT)
#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)

#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. ;)
 */

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 REGION_SHIFT	(sizeof(pte_t) * 8 - 4)
#define REGION_MASK	(((unsigned long) 0xf) << REGION_SHIFT)

#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)
#define PAGE_KERNEL_RO	__pgprot(_PAGE_PRESENT | _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

/*
 * Define this if things work differently on an i386 and an i486:
 * it will (on an i486) warn about kernel memory accesses that are
 * done without a 'access_ok(VERIFY_WRITE,..)'
 */
#undef TEST_VERIFY_AREA

/* page table for 0-4MB for everybody */
extern unsigned long pg0[1024];

/*
 * 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)

/* number of bits that fit into a memory pointer */
#define BITS_PER_PTR			(8*sizeof(unsigned long))

/* to align the pointer to a pointer address */
#define PTR_MASK			(~(sizeof(void*)-1))

/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
/* 64-bit machines, beware!  SRB. */
#define SIZEOF_PTR_LOG2			3

/* to find an entry in a page-table */
#define PAGE_PTR(address) \
((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)

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

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

#define pte_page(x) pfn_to_page(pte_pfn(x))
#define pte_address(x) (__va(pte_val(x) & PAGE_MASK))
#define mk_phys(a, r) ((a) + (((unsigned long) r) << REGION_SHIFT))
#define phys_addr(p) ((p) & ~REGION_MASK)

#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)));
}

/*
 * =================================
 * 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 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(page_to_pfn(page))

#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; 
}

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

/*
 * 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))

#define pgd_index_k(addr) pgd_index(addr)

/*
 * 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_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))

/*
 * 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)

#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>

#include <asm-generic/pgtable-nopud.h>

#ifdef CONFIG_HIGHMEM
/* Clear a kernel PTE and flush it from the TLB */
#define kpte_clear_flush(ptep, vaddr)					\
do {									\
	pte_clear(&init_mm, vaddr, ptep);				\
	__flush_tlb_one(vaddr);						\
} while (0)
#endif

#endif
#endif

#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) 2000, 2001, 2002 Jeff Dike ([email protected])
	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
	11	#include "linux/sched.h"
	12	#include "linux/linkage.h"
	13	#include "asm/processor.h"
	14	#include "asm/page.h"
	15	#include "asm/fixmap.h"
	16
	17	#define _PAGE_PRESENT 0x001
	18	#define _PAGE_NEWPAGE 0x002
9b4ee40e	19	#define _PAGE_NEWPROT 0x004
1da177e4 LT	20	#define _PAGE_RW 0x020
	21	#define _PAGE_USER 0x040
	22	#define _PAGE_ACCESSED 0x080
	23	#define _PAGE_DIRTY 0x100
9b4ee40e PBG	24	/* If _PAGE_PRESENT is clear, we use these: */
	25	#define _PAGE_FILE 0x008 /* nonlinear file mapping, saved PTE; unset:swap */
	26	#define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE;
	27	pte_present gives true */
1da177e4 LT	28
	29	#ifdef CONFIG_3_LEVEL_PGTABLES
	30	#include "asm/pgtable-3level.h"
	31	#else
	32	#include "asm/pgtable-2level.h"
	33	#endif
	34
	35	extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
	36
	37	extern void um_virt_to_phys(struct task_struct task, unsigned long virt,
	38	pte_t *pte_out);
	39
	40	/* zero page used for uninitialized stuff */
	41	extern unsigned long *empty_zero_page;
	42
	43	#define pgtable_cache_init() do ; while (0)
	44
	45	/*
	46	* pgd entries used up by user/kernel:
	47	*/
	48
	49	#define USER_PGD_PTRS (TASK_SIZE >> PGDIR_SHIFT)
	50	#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
	51
	52	#ifndef __ASSEMBLY__
	53	/* Just any arbitrary offset to the start of the vmalloc VM area: the
	54	* current 8MB value just means that there will be a 8MB "hole" after the
	55	* physical memory until the kernel virtual memory starts. That means that
	56	* any out-of-bounds memory accesses will hopefully be caught.
	57	* The vmalloc() routines leaves a hole of 4kB between each vmalloced
	58	* area for the same reason. ;)
	59	*/
	60
	61	extern unsigned long end_iomem;
	62
	63	#define VMALLOC_OFFSET (__va_space)
	64	#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
	65
	66	#ifdef CONFIG_HIGHMEM
	67	# define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE)
	68	#else
	69	# define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
	70	#endif
	71
	72	#define REGION_SHIFT (sizeof(pte_t) * 8 - 4)
	73	#define REGION_MASK (((unsigned long) 0xf) << REGION_SHIFT)
	74
	75	#define _PAGE_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	76	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	77	#define _PAGE_CHG_MASK (PAGE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	78
	79	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
	80	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED)
	81	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	82	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	83	#define PAGE_KERNEL __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED)
	84	#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT \| _PAGE_DIRTY \| _PAGE_ACCESSED)
	85
	86	/*
	87	* The i386 can't do page protection for execute, and considers that the same are read.
	88	* Also, write permissions imply read permissions. This is the closest we can get..
	89	*/
	90	#define __P000 PAGE_NONE
	91	#define __P001 PAGE_READONLY
92	#define __P010 PAGE_COPY
93	#define __P011 PAGE_COPY
94	#define __P100 PAGE_READONLY
95	#define __P101 PAGE_READONLY
96	#define __P110 PAGE_COPY
97	#define __P111 PAGE_COPY
98
99	#define __S000 PAGE_NONE
100	#define __S001 PAGE_READONLY
101	#define __S010 PAGE_SHARED
102	#define __S011 PAGE_SHARED
103	#define __S100 PAGE_READONLY
104	#define __S101 PAGE_READONLY
105	#define __S110 PAGE_SHARED
106	#define __S111 PAGE_SHARED
107
108	/*
109	* Define this if things work differently on an i386 and an i486:
110	* it will (on an i486) warn about kernel memory accesses that are
3d675548	111	* done without a 'access_ok(VERIFY_WRITE,..)'
1da177e4 LT	112	*/
	113	#undef TEST_VERIFY_AREA
	114
	115	/* page table for 0-4MB for everybody */
	116	extern unsigned long pg0[1024];
	117
	118	/*
1da177e4 LT	119	* ZERO_PAGE is a global shared page that is always zero: used
	120	* for zero-mapped memory areas etc..
	121	*/
1da177e4 LT	122
	123	#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
	124
	125	/* number of bits that fit into a memory pointer */
	126	#define BITS_PER_PTR (8*sizeof(unsigned long))
	127
	128	/* to align the pointer to a pointer address */
	129	#define PTR_MASK (~(sizeof(void*)-1))
	130
	131	/* sizeof(void)==1<<SIZEOF_PTR_LOG2 /
	132	/* 64-bit machines, beware! SRB. */
	133	#define SIZEOF_PTR_LOG2 3
	134
	135	/* to find an entry in a page-table */
	136	#define PAGE_PTR(address) \
	137	((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
	138
	139	#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
	140
705e87c0	141	#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
1da177e4 LT	142	#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
	143	#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
	144	#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
	145
	146	#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE)
	147	#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
	148
	149	#define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE)
	150	#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
	151
	152	#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
	153
	154	#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
	155
08964c56	156	#define pte_page(x) pfn_to_page(pte_pfn(x))
1da177e4 LT	157	#define pte_address(x) (__va(pte_val(x) & PAGE_MASK))
	158	#define mk_phys(a, r) ((a) + (((unsigned long) r) << REGION_SHIFT))
	159	#define phys_addr(p) ((p) & ~REGION_MASK)
	160
08964c56 JD	161	#define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT \| _PAGE_PROTNONE))
	162
	163	/*
	164	* =================================
	165	* Flags checking section.
	166	* =================================
	167	*/
	168
	169	static inline int pte_none(pte_t pte)
	170	{
	171	return pte_is_zero(pte);
	172	}
	173
1da177e4 LT	174	/*
	175	* The following only work if pte_present() is true.
	176	* Undefined behaviour if not..
	177	*/
1da177e4 LT	178	static inline int pte_read(pte_t pte)
	179	{
	180	return((pte_get_bits(pte, _PAGE_USER)) &&
	181	!(pte_get_bits(pte, _PAGE_PROTNONE)));
	182	}
	183
	184	static inline int pte_exec(pte_t pte){
	185	return((pte_get_bits(pte, _PAGE_USER)) &&
	186	!(pte_get_bits(pte, _PAGE_PROTNONE)));
	187	}
	188
	189	static inline int pte_write(pte_t pte)
	190	{
	191	return((pte_get_bits(pte, _PAGE_RW)) &&
	192	!(pte_get_bits(pte, _PAGE_PROTNONE)));
	193	}
	194
	195	/*
	196	* The following only works if pte_present() is not true.
	197	*/
	198	static inline int pte_file(pte_t pte)
	199	{
	200	return pte_get_bits(pte, _PAGE_FILE);
	201	}
	202
	203	static inline int pte_dirty(pte_t pte)
	204	{
	205	return pte_get_bits(pte, _PAGE_DIRTY);
	206	}
	207
	208	static inline int pte_young(pte_t pte)
	209	{
	210	return pte_get_bits(pte, _PAGE_ACCESSED);
	211	}
	212
	213	static inline int pte_newpage(pte_t pte)
	214	{
	215	return pte_get_bits(pte, _PAGE_NEWPAGE);
	216	}
	217
	218	static inline int pte_newprot(pte_t pte)
	219	{
	220	return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
	221	}
	222
08964c56 JD	223	/*
	224	* =================================
	225	* Flags setting section.
	226	* =================================
	227	*/
	228
	229	static inline pte_t pte_mknewprot(pte_t pte)
	230	{
	231	pte_set_bits(pte, _PAGE_NEWPROT);
	232	return(pte);
	233	}
	234
1da177e4 LT	235	static inline pte_t pte_mkclean(pte_t pte)
	236	{
	237	pte_clear_bits(pte, _PAGE_DIRTY);
	238	return(pte);
	239	}
	240
	241	static inline pte_t pte_mkold(pte_t pte)
	242	{
	243	pte_clear_bits(pte, _PAGE_ACCESSED);
	244	return(pte);
	245	}
	246
	247	static inline pte_t pte_wrprotect(pte_t pte)
	248	{
	249	pte_clear_bits(pte, _PAGE_RW);
	250	return(pte_mknewprot(pte));
	251	}
	252
	253	static inline pte_t pte_mkread(pte_t pte)
	254	{
1463fdbc	255	pte_set_bits(pte, _PAGE_USER);
1da177e4 LT	256	return(pte_mknewprot(pte));
	257	}
	258
1da177e4 LT	259	static inline pte_t pte_mkdirty(pte_t pte)
	260	{
	261	pte_set_bits(pte, _PAGE_DIRTY);
	262	return(pte);
	263	}
	264
	265	static inline pte_t pte_mkyoung(pte_t pte)
	266	{
	267	pte_set_bits(pte, _PAGE_ACCESSED);
	268	return(pte);
	269	}
	270
	271	static inline pte_t pte_mkwrite(pte_t pte)
	272	{
	273	pte_set_bits(pte, _PAGE_RW);
	274	return(pte_mknewprot(pte));
	275	}
	276
	277	static inline pte_t pte_mkuptodate(pte_t pte)
	278	{
	279	pte_clear_bits(pte, _PAGE_NEWPAGE);
	280	if(pte_present(pte))
	281	pte_clear_bits(pte, _PAGE_NEWPROT);
	282	return(pte);
	283	}
	284
08964c56 JD	285	static inline pte_t pte_mknewpage(pte_t pte)
	286	{
	287	pte_set_bits(pte, _PAGE_NEWPAGE);
	288	return(pte);
	289	}
	290
	291	static inline void set_pte(pte_t *pteptr, pte_t pteval)
	292	{
	293	pte_copy(*pteptr, pteval);
	294
	295	/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
	296	* fix_range knows to unmap it. _PAGE_NEWPROT is specific to
	297	* mapped pages.
	298	*/
	299
	300	pteptr = pte_mknewpage(pteptr);
	301	if(pte_present(pteptr)) pteptr = pte_mknewprot(*pteptr);
	302	}
	303	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
	304
1da177e4 LT	305	/*
	306	* Conversion functions: convert a page and protection to a page entry,
	307	* and a page entry and page directory to the page they refer to.
	308	*/
	309
d99c4022 PBG	310	#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
	311	#define __virt_to_page(virt) phys_to_page(__pa(virt))
	312	#define page_to_phys(page) pfn_to_phys(page_to_pfn(page))
	313
	314	#define mk_pte(page, pgprot) \
	315	({ pte_t pte; \
	316	\
	317	pte_set_val(pte, page_to_phys(page), (pgprot)); \
	318	if (pte_present(pte)) \
	319	pte_mknewprot(pte_mknewpage(pte)); \
	320	pte;})
1da177e4 LT	321
	322	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	323	{
	324	pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
1da177e4 LT	325	return pte;
	326	}
	327
46a82b2d	328	#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
1da177e4 LT	329
	330	/*
	331	* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
	332	*
	333	* this macro returns the index of the entry in the pgd page which would
	334	* control the given virtual address
	335	*/
	336	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
	337
	338	#define pgd_index_k(addr) pgd_index(addr)
	339
	340	/*
	341	* pgd_offset() returns a (pgd_t *)
	342	* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
	343	*/
	344	#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
	345
	346	/*
	347	* a shortcut which implies the use of the kernel's pgd, instead
	348	* of a process's
	349	*/
	350	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	351
	352	/*
	353	* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
	354	*
	355	* this macro returns the index of the entry in the pmd page which would
	356	* control the given virtual address
	357	*/
	358	#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
	359
	360	/*
	361	* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
	362	*
	363	* this macro returns the index of the entry in the pte page which would
	364	* control the given virtual address
	365	*/
	366	#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
	367	#define pte_offset_kernel(dir, address) \
46a82b2d	368	((pte_t ) pmd_page_vaddr((dir)) + pte_index(address))
1da177e4 LT	369	#define pte_offset_map(dir, address) \
	370	((pte_t )page_address(pmd_page((dir))) + pte_index(address))
	371	#define pte_offset_map_nested(dir, address) pte_offset_map(dir, address)
	372	#define pte_unmap(pte) do { } while (0)
	373	#define pte_unmap_nested(pte) do { } while (0)
	374
	375	#define update_mmu_cache(vma,address,pte) do ; while (0)
	376
	377	/* Encode and de-code a swap entry */
	378	#define __swp_type(x) (((x).val >> 4) & 0x3f)
	379	#define __swp_offset(x) ((x).val >> 11)
	380
	381	#define __swp_entry(type, offset) \
	382	((swp_entry_t) { ((type) << 4) \| ((offset) << 11) })
	383	#define __pte_to_swp_entry(pte) \
	384	((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
	385	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	386
	387	#define kern_addr_valid(addr) (1)
	388
	389	#include <asm-generic/pgtable.h>
	390
	391	#include <asm-generic/pgtable-nopud.h>
	392
04add672 AV	393	#ifdef CONFIG_HIGHMEM
	394	/* Clear a kernel PTE and flush it from the TLB */
	395	#define kpte_clear_flush(ptep, vaddr) \
	396	do { \
	397	pte_clear(&init_mm, vaddr, ptep); \
	398	__flush_tlb_one(vaddr); \
	399	} while (0)
	400	#endif
	401
1da177e4 LT	402	#endif
	403	#endif
	404
1da177e4 LT	405	#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
	406
	407	/*
	408	* Overrides for Emacs so that we follow Linus's tabbing style.
	409	* Emacs will notice this stuff at the end of the file and automatically
	410	* adjust the settings for this buffer only. This must remain at the end
	411	* of the file.
	412	* ---------------------------------------------------------------------------
	413	* Local variables:
	414	* c-file-style: "linux"
	415	* End:
	416	*/