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

/* SPDX-License-Identifier: GPL-2.0 */
/* 
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Copyright 2003 PathScale, Inc.
 * Derived from include/asm-i386/pgtable.h
 */

#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_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;

/* 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))
#define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
#define VMALLOC_END	(FIXADDR_START-2*PAGE_SIZE)
#define MODULES_VADDR	VMALLOC_START
#define MODULES_END	VMALLOC_END
#define MODULES_LEN	(MODULES_VADDR - MODULES_END)

#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_KERNEL_EXEC                                              \
	 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
#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_EXEC	__pgprot(__PAGE_KERNEL_EXEC)

/*
 * 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)));
}

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)
{ 
	if (likely(pte_get_bits(pte, _PAGE_RW)))
		pte_clear_bits(pte, _PAGE_RW);
	else
		return pte;
	return(pte_mknewprot(pte)); 
}

static inline pte_t pte_mkread(pte_t pte)
{ 
	if (unlikely(pte_get_bits(pte, _PAGE_USER)))
		return 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)	
{
	if (unlikely(pte_get_bits(pte,  _PAGE_RW)))
		return 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);
}

static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
			      pte_t *pteptr, pte_t pteval)
{
	set_pte(pteptr, pteval);
}

#define __HAVE_ARCH_PTE_SAME
static inline int pte_same(pte_t pte_a, pte_t pte_b)
{
	return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
}

/*
 * 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 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_unmap(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,ptep) do ; while (0)

/* Encode and de-code a swap entry */
#define __swp_type(x)			(((x).val >> 5) & 0x1f)
#define __swp_offset(x)			((x).val >> 11)

#define __swp_entry(type, offset) \
	((swp_entry_t) { ((type) << 5) | ((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>

/* 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
Commit	Line	Data
f2f4bf5a	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4	2	/*
d83ecf08	3	* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
1da177e4 LT	4	* Copyright 2003 PathScale, Inc.
1da177e4 LT	5	* Derived from include/asm-i386/pgtable.h
1da177e4 LT	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	20	/* If _PAGE_PRESENT is clear, we use these: */
9b4ee40e PBG	21	#define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE;
9b4ee40e PBG	22	pte_present gives true */
1da177e4 LT	23
1da177e4 LT	24	#ifdef CONFIG_3_LEVEL_PGTABLES
37185b33	25	#include <asm/pgtable-3level.h>
1da177e4	26	#else
37185b33	27	#include <asm/pgtable-2level.h>
1da177e4 LT	28	#endif
	29
	30	extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
	31
1da177e4 LT	32	/* zero page used for uninitialized stuff */
	33	extern unsigned long *empty_zero_page;
	34
1da177e4 LT	35	/* Just any arbitrary offset to the start of the vmalloc VM area: the
	36	* current 8MB value just means that there will be a 8MB "hole" after the
	37	* physical memory until the kernel virtual memory starts. That means that
	38	* any out-of-bounds memory accesses will hopefully be caught.
	39	* The vmalloc() routines leaves a hole of 4kB between each vmalloced
	40	* area for the same reason. ;)
	41	*/
	42
	43	extern unsigned long end_iomem;
	44
	45	#define VMALLOC_OFFSET (__va_space)
	46	#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
fe1cd987	47	#define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
a98a6d86	48	#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
c398df30 AW	49	#define MODULES_VADDR VMALLOC_START
	50	#define MODULES_END VMALLOC_END
	51	#define MODULES_LEN (MODULES_VADDR - MODULES_END)
1da177e4	52
1da177e4 LT	53	#define _PAGE_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	54	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	55	#define _PAGE_CHG_MASK (PAGE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
c398df30 AW	56	#define __PAGE_KERNEL_EXEC \
c398df30 AW	57	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED)
1da177e4 LT	58	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
	59	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED)
	60	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	61	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	62	#define PAGE_KERNEL __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED)
c398df30	63	#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
1da177e4 LT	64
1da177e4 LT	65	/*
d83ecf08 JD	66	* The i386 can't do page protection for execute, and considers that the same
	67	* are read.
	68	* Also, write permissions imply read permissions. This is the closest we can
	69	* get..
1da177e4 LT	70	*/
	71	#define __P000 PAGE_NONE
	72	#define __P001 PAGE_READONLY
	73	#define __P010 PAGE_COPY
	74	#define __P011 PAGE_COPY
	75	#define __P100 PAGE_READONLY
	76	#define __P101 PAGE_READONLY
	77	#define __P110 PAGE_COPY
	78	#define __P111 PAGE_COPY
	79
	80	#define __S000 PAGE_NONE
	81	#define __S001 PAGE_READONLY
	82	#define __S010 PAGE_SHARED
	83	#define __S011 PAGE_SHARED
	84	#define __S100 PAGE_READONLY
	85	#define __S101 PAGE_READONLY
	86	#define __S110 PAGE_SHARED
	87	#define __S111 PAGE_SHARED
	88
1da177e4	89	/*
1da177e4 LT	90	* ZERO_PAGE is a global shared page that is always zero: used
	91	* for zero-mapped memory areas etc..
	92	*/
1da177e4 LT	93	#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
1da177e4 LT	94
1da177e4 LT	95	#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
1da177e4 LT	96
705e87c0	97	#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
1da177e4	98	#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
d83ecf08	99
1da177e4 LT	100	#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
	101	#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
	102
	103	#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE)
	104	#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
	105
	106	#define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE)
	107	#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
	108
1da177e4 LT	109	#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
1da177e4 LT	110
08964c56	111	#define pte_page(x) pfn_to_page(pte_pfn(x))
1da177e4	112
08964c56 JD	113	#define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT \| _PAGE_PROTNONE))
	114
	115	/*
	116	* =================================
	117	* Flags checking section.
	118	* =================================
	119	*/
	120
	121	static inline int pte_none(pte_t pte)
	122	{
	123	return pte_is_zero(pte);
	124	}
	125
1da177e4 LT	126	/*
	127	* The following only work if pte_present() is true.
	128	* Undefined behaviour if not..
	129	*/
1da177e4 LT	130	static inline int pte_read(pte_t pte)
	131	{
	132	return((pte_get_bits(pte, _PAGE_USER)) &&
	133	!(pte_get_bits(pte, _PAGE_PROTNONE)));
	134	}
	135
	136	static inline int pte_exec(pte_t pte){
	137	return((pte_get_bits(pte, _PAGE_USER)) &&
	138	!(pte_get_bits(pte, _PAGE_PROTNONE)));
	139	}
	140
	141	static inline int pte_write(pte_t pte)
	142	{
	143	return((pte_get_bits(pte, _PAGE_RW)) &&
	144	!(pte_get_bits(pte, _PAGE_PROTNONE)));
	145	}
	146
1da177e4 LT	147	static inline int pte_dirty(pte_t pte)
	148	{
	149	return pte_get_bits(pte, _PAGE_DIRTY);
	150	}
	151
	152	static inline int pte_young(pte_t pte)
	153	{
	154	return pte_get_bits(pte, _PAGE_ACCESSED);
	155	}
	156
	157	static inline int pte_newpage(pte_t pte)
	158	{
	159	return pte_get_bits(pte, _PAGE_NEWPAGE);
	160	}
	161
	162	static inline int pte_newprot(pte_t pte)
	163	{
	164	return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
	165	}
	166
7e675137 NP	167	static inline int pte_special(pte_t pte)
	168	{
	169	return 0;
	170	}
	171
08964c56 JD	172	/*
	173	* =================================
	174	* Flags setting section.
	175	* =================================
	176	*/
	177
	178	static inline pte_t pte_mknewprot(pte_t pte)
	179	{
	180	pte_set_bits(pte, _PAGE_NEWPROT);
	181	return(pte);
	182	}
	183
1da177e4 LT	184	static inline pte_t pte_mkclean(pte_t pte)
	185	{
	186	pte_clear_bits(pte, _PAGE_DIRTY);
	187	return(pte);
	188	}
	189
	190	static inline pte_t pte_mkold(pte_t pte)
	191	{
	192	pte_clear_bits(pte, _PAGE_ACCESSED);
	193	return(pte);
	194	}
	195
	196	static inline pte_t pte_wrprotect(pte_t pte)
	197	{
8892d854 AI	198	if (likely(pte_get_bits(pte, _PAGE_RW)))
	199	pte_clear_bits(pte, _PAGE_RW);
	200	else
	201	return pte;
1da177e4 LT	202	return(pte_mknewprot(pte));
	203	}
	204
	205	static inline pte_t pte_mkread(pte_t pte)
	206	{
8892d854 AI	207	if (unlikely(pte_get_bits(pte, _PAGE_USER)))
8892d854 AI	208	return pte;
1463fdbc	209	pte_set_bits(pte, _PAGE_USER);
1da177e4 LT	210	return(pte_mknewprot(pte));
	211	}
	212
1da177e4 LT	213	static inline pte_t pte_mkdirty(pte_t pte)
	214	{
	215	pte_set_bits(pte, _PAGE_DIRTY);
	216	return(pte);
	217	}
	218
	219	static inline pte_t pte_mkyoung(pte_t pte)
	220	{
	221	pte_set_bits(pte, _PAGE_ACCESSED);
	222	return(pte);
	223	}
	224
	225	static inline pte_t pte_mkwrite(pte_t pte)
	226	{
8892d854 AI	227	if (unlikely(pte_get_bits(pte, _PAGE_RW)))
8892d854 AI	228	return pte;
1da177e4 LT	229	pte_set_bits(pte, _PAGE_RW);
	230	return(pte_mknewprot(pte));
	231	}
	232
	233	static inline pte_t pte_mkuptodate(pte_t pte)
	234	{
	235	pte_clear_bits(pte, _PAGE_NEWPAGE);
	236	if(pte_present(pte))
	237	pte_clear_bits(pte, _PAGE_NEWPROT);
	238	return(pte);
	239	}
	240
08964c56 JD	241	static inline pte_t pte_mknewpage(pte_t pte)
	242	{
	243	pte_set_bits(pte, _PAGE_NEWPAGE);
	244	return(pte);
	245	}
	246
7e675137 NP	247	static inline pte_t pte_mkspecial(pte_t pte)
	248	{
	249	return(pte);
	250	}
	251
08964c56 JD	252	static inline void set_pte(pte_t *pteptr, pte_t pteval)
	253	{
	254	pte_copy(*pteptr, pteval);
	255
	256	/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
	257	* fix_range knows to unmap it. _PAGE_NEWPROT is specific to
	258	* mapped pages.
	259	*/
	260
	261	pteptr = pte_mknewpage(pteptr);
	262	if(pte_present(pteptr)) pteptr = pte_mknewprot(*pteptr);
	263	}
ea70d791 BG	264
	265	static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
	266	pte_t *pteptr, pte_t pteval)
	267	{
	268	set_pte(pteptr, pteval);
	269	}
08964c56	270
f15b9000 RW	271	#define __HAVE_ARCH_PTE_SAME
	272	static inline int pte_same(pte_t pte_a, pte_t pte_b)
	273	{
	274	return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
	275	}
	276
1da177e4 LT	277	/*
	278	* Conversion functions: convert a page and protection to a page entry,
	279	* and a page entry and page directory to the page they refer to.
	280	*/
	281
d99c4022 PBG	282	#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
d99c4022 PBG	283	#define __virt_to_page(virt) phys_to_page(__pa(virt))
16da3068	284	#define page_to_phys(page) pfn_to_phys(page_to_pfn(page))
d83ecf08	285	#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
d99c4022 PBG	286
	287	#define mk_pte(page, pgprot) \
	288	({ pte_t pte; \
	289	\
	290	pte_set_val(pte, page_to_phys(page), (pgprot)); \
	291	if (pte_present(pte)) \
	292	pte_mknewprot(pte_mknewpage(pte)); \
	293	pte;})
1da177e4 LT	294
	295	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	296	{
	297	pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
1da177e4 LT	298	return pte;
	299	}
	300
1da177e4 LT	301	/*
	302	* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
	303	*
	304	* this macro returns the index of the entry in the pgd page which would
	305	* control the given virtual address
	306	*/
	307	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
	308
1da177e4 LT	309	/*
	310	* pgd_offset() returns a (pgd_t *)
	311	* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
	312	*/
	313	#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
	314
	315	/*
	316	* a shortcut which implies the use of the kernel's pgd, instead
	317	* of a process's
	318	*/
	319	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	320
	321	/*
	322	* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
	323	*
	324	* this macro returns the index of the entry in the pmd page which would
	325	* control the given virtual address
	326	*/
300ecf59	327	#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
1da177e4 LT	328	#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
1da177e4 LT	329
909e90d3 JD	330	#define pmd_page_vaddr(pmd) \
	331	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
	332
1da177e4 LT	333	/*
	334	* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
	335	*
	336	* this macro returns the index of the entry in the pte page which would
	337	* control the given virtual address
	338	*/
	339	#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
	340	#define pte_offset_kernel(dir, address) \
46a82b2d	341	((pte_t ) pmd_page_vaddr((dir)) + pte_index(address))
1da177e4 LT	342	#define pte_offset_map(dir, address) \
1da177e4 LT	343	((pte_t )page_address(pmd_page((dir))) + pte_index(address))
1da177e4	344	#define pte_unmap(pte) do { } while (0)
1da177e4	345
ca77b555 JD	346	struct mm_struct;
	347	extern pte_t virt_to_pte(struct mm_struct mm, unsigned long addr);
	348
4b3073e1	349	#define update_mmu_cache(vma,address,ptep) do ; while (0)
1da177e4 LT	350
1da177e4 LT	351	/* Encode and de-code a swap entry */
2b76ebaa	352	#define __swp_type(x) (((x).val >> 5) & 0x1f)
1da177e4 LT	353	#define __swp_offset(x) ((x).val >> 11)
	354
	355	#define __swp_entry(type, offset) \
2b76ebaa	356	((swp_entry_t) { ((type) << 5) \| ((offset) << 11) })
1da177e4 LT	357	#define __pte_to_swp_entry(pte) \
	358	((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
	359	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	360
	361	#define kern_addr_valid(addr) (1)
	362
	363	#include <asm-generic/pgtable.h>
	364
fe1cd987 AV	365	/* Clear a kernel PTE and flush it from the TLB */
	366	#define kpte_clear_flush(ptep, vaddr) \
	367	do { \
	368	pte_clear(&init_mm, (vaddr), (ptep)); \
	369	__flush_tlb_one((vaddr)); \
	370	} while (0)
	371
04add672	372	#endif