[deliverable/linux.git] / include / asm-x86 / pgtable.h

#ifndef _ASM_X86_PGTABLE_H
#define _ASM_X86_PGTABLE_H

#define FIRST_USER_ADDRESS	0

#define _PAGE_BIT_PRESENT	0	/* is present */
#define _PAGE_BIT_RW		1	/* writeable */
#define _PAGE_BIT_USER		2	/* userspace addressable */
#define _PAGE_BIT_PWT		3	/* page write through */
#define _PAGE_BIT_PCD		4	/* page cache disabled */
#define _PAGE_BIT_ACCESSED	5	/* was accessed (raised by CPU) */
#define _PAGE_BIT_DIRTY		6	/* was written to (raised by CPU) */
#define _PAGE_BIT_FILE		6
#define _PAGE_BIT_PSE		7	/* 4 MB (or 2MB) page */
#define _PAGE_BIT_PAT		7	/* on 4KB pages */
#define _PAGE_BIT_GLOBAL	8	/* Global TLB entry PPro+ */
#define _PAGE_BIT_UNUSED1	9	/* available for programmer */
#define _PAGE_BIT_UNUSED2	10
#define _PAGE_BIT_UNUSED3	11
#define _PAGE_BIT_PAT_LARGE	12	/* On 2MB or 1GB pages */
#define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */

#define _PAGE_PRESENT	(_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
#define _PAGE_RW	(_AT(pteval_t, 1) << _PAGE_BIT_RW)
#define _PAGE_USER	(_AT(pteval_t, 1) << _PAGE_BIT_USER)
#define _PAGE_PWT	(_AT(pteval_t, 1) << _PAGE_BIT_PWT)
#define _PAGE_PCD	(_AT(pteval_t, 1) << _PAGE_BIT_PCD)
#define _PAGE_ACCESSED	(_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
#define _PAGE_DIRTY	(_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
#define _PAGE_PSE	(_AT(pteval_t, 1) << _PAGE_BIT_PSE)
#define _PAGE_GLOBAL	(_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
#define _PAGE_UNUSED1	(_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
#define _PAGE_UNUSED2	(_AT(pteval_t, 1) << _PAGE_BIT_UNUSED2)
#define _PAGE_UNUSED3	(_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
#define _PAGE_PAT	(_AT(pteval_t, 1) << _PAGE_BIT_PAT)
#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)

#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
#define _PAGE_NX	(_AT(pteval_t, 1) << _PAGE_BIT_NX)
#else
#define _PAGE_NX	(_AT(pteval_t, 0))
#endif

/* If _PAGE_PRESENT is clear, we use these: */
#define _PAGE_FILE	_PAGE_DIRTY	/* nonlinear file mapping,
					 * saved PTE; unset:swap */
#define _PAGE_PROTNONE	_PAGE_PSE	/* if the user mapped it with PROT_NONE;
					   pte_present gives true */

#define _PAGE_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |	\
			 _PAGE_ACCESSED | _PAGE_DIRTY)
#define _KERNPG_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |	\
			 _PAGE_DIRTY)

/* Set of bits not changed in pte_modify */
#define _PAGE_CHG_MASK	(PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |		\
			 _PAGE_ACCESSED | _PAGE_DIRTY)

#define _PAGE_CACHE_MASK	(_PAGE_PCD | _PAGE_PWT)
#define _PAGE_CACHE_WB		(0)
#define _PAGE_CACHE_WC		(_PAGE_PWT)
#define _PAGE_CACHE_UC_MINUS	(_PAGE_PCD)
#define _PAGE_CACHE_UC		(_PAGE_PCD | _PAGE_PWT)

#define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
				 _PAGE_ACCESSED | _PAGE_NX)

#define PAGE_SHARED_EXEC	__pgprot(_PAGE_PRESENT | _PAGE_RW |	\
					 _PAGE_USER | _PAGE_ACCESSED)
#define PAGE_COPY_NOEXEC	__pgprot(_PAGE_PRESENT | _PAGE_USER |	\
					 _PAGE_ACCESSED | _PAGE_NX)
#define PAGE_COPY_EXEC		__pgprot(_PAGE_PRESENT | _PAGE_USER |	\
					 _PAGE_ACCESSED)
#define PAGE_COPY		PAGE_COPY_NOEXEC
#define PAGE_READONLY		__pgprot(_PAGE_PRESENT | _PAGE_USER |	\
					 _PAGE_ACCESSED | _PAGE_NX)
#define PAGE_READONLY_EXEC	__pgprot(_PAGE_PRESENT | _PAGE_USER |	\
					 _PAGE_ACCESSED)

#define __PAGE_KERNEL_EXEC						\
	(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
#define __PAGE_KERNEL		(__PAGE_KERNEL_EXEC | _PAGE_NX)

#define __PAGE_KERNEL_RO		(__PAGE_KERNEL & ~_PAGE_RW)
#define __PAGE_KERNEL_RX		(__PAGE_KERNEL_EXEC & ~_PAGE_RW)
#define __PAGE_KERNEL_EXEC_NOCACHE	(__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
#define __PAGE_KERNEL_WC		(__PAGE_KERNEL | _PAGE_CACHE_WC)
#define __PAGE_KERNEL_NOCACHE		(__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
#define __PAGE_KERNEL_UC_MINUS		(__PAGE_KERNEL | _PAGE_PCD)
#define __PAGE_KERNEL_VSYSCALL		(__PAGE_KERNEL_RX | _PAGE_USER)
#define __PAGE_KERNEL_VSYSCALL_NOCACHE	(__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
#define __PAGE_KERNEL_LARGE		(__PAGE_KERNEL | _PAGE_PSE)
#define __PAGE_KERNEL_LARGE_NOCACHE	(__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
#define __PAGE_KERNEL_LARGE_EXEC	(__PAGE_KERNEL_EXEC | _PAGE_PSE)

#define PAGE_KERNEL			__pgprot(__PAGE_KERNEL)
#define PAGE_KERNEL_RO			__pgprot(__PAGE_KERNEL_RO)
#define PAGE_KERNEL_EXEC		__pgprot(__PAGE_KERNEL_EXEC)
#define PAGE_KERNEL_RX			__pgprot(__PAGE_KERNEL_RX)
#define PAGE_KERNEL_WC			__pgprot(__PAGE_KERNEL_WC)
#define PAGE_KERNEL_NOCACHE		__pgprot(__PAGE_KERNEL_NOCACHE)
#define PAGE_KERNEL_UC_MINUS		__pgprot(__PAGE_KERNEL_UC_MINUS)
#define PAGE_KERNEL_EXEC_NOCACHE	__pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
#define PAGE_KERNEL_LARGE		__pgprot(__PAGE_KERNEL_LARGE)
#define PAGE_KERNEL_LARGE_NOCACHE	__pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
#define PAGE_KERNEL_LARGE_EXEC		__pgprot(__PAGE_KERNEL_LARGE_EXEC)
#define PAGE_KERNEL_VSYSCALL		__pgprot(__PAGE_KERNEL_VSYSCALL)
#define PAGE_KERNEL_VSYSCALL_NOCACHE	__pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)

/*         xwr */
#define __P000	PAGE_NONE
#define __P001	PAGE_READONLY
#define __P010	PAGE_COPY
#define __P011	PAGE_COPY
#define __P100	PAGE_READONLY_EXEC
#define __P101	PAGE_READONLY_EXEC
#define __P110	PAGE_COPY_EXEC
#define __P111	PAGE_COPY_EXEC

#define __S000	PAGE_NONE
#define __S001	PAGE_READONLY
#define __S010	PAGE_SHARED
#define __S011	PAGE_SHARED
#define __S100	PAGE_READONLY_EXEC
#define __S101	PAGE_READONLY_EXEC
#define __S110	PAGE_SHARED_EXEC
#define __S111	PAGE_SHARED_EXEC

#ifndef __ASSEMBLY__

/*
 * ZERO_PAGE is a global shared page that is always zero: used
 * for zero-mapped memory areas etc..
 */
extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))

extern spinlock_t pgd_lock;
extern struct list_head pgd_list;

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
static inline int pte_dirty(pte_t pte)
{
	return pte_flags(pte) & _PAGE_DIRTY;
}

static inline int pte_young(pte_t pte)
{
	return pte_flags(pte) & _PAGE_ACCESSED;
}

static inline int pte_write(pte_t pte)
{
	return pte_flags(pte) & _PAGE_RW;
}

static inline int pte_file(pte_t pte)
{
	return pte_flags(pte) & _PAGE_FILE;
}

static inline int pte_huge(pte_t pte)
{
	return pte_flags(pte) & _PAGE_PSE;
}

static inline int pte_global(pte_t pte)
{
	return pte_flags(pte) & _PAGE_GLOBAL;
}

static inline int pte_exec(pte_t pte)
{
	return !(pte_flags(pte) & _PAGE_NX);
}

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

static inline int pmd_large(pmd_t pte)
{
	return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
		(_PAGE_PSE | _PAGE_PRESENT);
}

static inline pte_t pte_mkclean(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_DIRTY);
}

static inline pte_t pte_mkold(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
}

static inline pte_t pte_wrprotect(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_RW);
}

static inline pte_t pte_mkexec(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_NX);
}

static inline pte_t pte_mkdirty(pte_t pte)
{
	return __pte(pte_val(pte) | _PAGE_DIRTY);
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	return __pte(pte_val(pte) | _PAGE_ACCESSED);
}

static inline pte_t pte_mkwrite(pte_t pte)
{
	return __pte(pte_val(pte) | _PAGE_RW);
}

static inline pte_t pte_mkhuge(pte_t pte)
{
	return __pte(pte_val(pte) | _PAGE_PSE);
}

static inline pte_t pte_clrhuge(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_PSE);
}

static inline pte_t pte_mkglobal(pte_t pte)
{
	return __pte(pte_val(pte) | _PAGE_GLOBAL);
}

static inline pte_t pte_clrglobal(pte_t pte)
{
	return __pte(pte_val(pte) & ~_PAGE_GLOBAL);
}

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

extern pteval_t __supported_pte_mask;

static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
{
	return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
		      pgprot_val(pgprot)) & __supported_pte_mask);
}

static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
{
	return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
		      pgprot_val(pgprot)) & __supported_pte_mask);
}

static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	pteval_t val = pte_val(pte);

	/*
	 * Chop off the NX bit (if present), and add the NX portion of
	 * the newprot (if present):
	 */
	val &= _PAGE_CHG_MASK;
	val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;

	return __pte(val);
}

/* mprotect needs to preserve PAT bits when updating vm_page_prot */
#define pgprot_modify pgprot_modify
static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
{
	pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
	pgprotval_t addbits = pgprot_val(newprot);
	return __pgprot(preservebits | addbits);
}

#define pte_pgprot(x) __pgprot(pte_flags(x) & ~PTE_PFN_MASK)

#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)

#ifndef __ASSEMBLY__
#define __HAVE_PHYS_MEM_ACCESS_PROT
struct file;
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
                              unsigned long size, pgprot_t vma_prot);
int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
                              unsigned long size, pgprot_t *vma_prot);
#endif

/* Install a pte for a particular vaddr in kernel space. */
void set_pte_vaddr(unsigned long vaddr, pte_t pte);

#ifdef CONFIG_X86_32
extern void native_pagetable_setup_start(pgd_t *base);
extern void native_pagetable_setup_done(pgd_t *base);
#else
static inline void native_pagetable_setup_start(pgd_t *base) {}
static inline void native_pagetable_setup_done(pgd_t *base) {}
#endif

#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else  /* !CONFIG_PARAVIRT */
#define set_pte(ptep, pte)		native_set_pte(ptep, pte)
#define set_pte_at(mm, addr, ptep, pte)	native_set_pte_at(mm, addr, ptep, pte)

#define set_pte_present(mm, addr, ptep, pte)				\
	native_set_pte_present(mm, addr, ptep, pte)
#define set_pte_atomic(ptep, pte)					\
	native_set_pte_atomic(ptep, pte)

#define set_pmd(pmdp, pmd)		native_set_pmd(pmdp, pmd)

#ifndef __PAGETABLE_PUD_FOLDED
#define set_pgd(pgdp, pgd)		native_set_pgd(pgdp, pgd)
#define pgd_clear(pgd)			native_pgd_clear(pgd)
#endif

#ifndef set_pud
# define set_pud(pudp, pud)		native_set_pud(pudp, pud)
#endif

#ifndef __PAGETABLE_PMD_FOLDED
#define pud_clear(pud)			native_pud_clear(pud)
#endif

#define pte_clear(mm, addr, ptep)	native_pte_clear(mm, addr, ptep)
#define pmd_clear(pmd)			native_pmd_clear(pmd)

#define pte_update(mm, addr, ptep)              do { } while (0)
#define pte_update_defer(mm, addr, ptep)        do { } while (0)

static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
{
	native_pagetable_setup_start(base);
}

static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
{
	native_pagetable_setup_done(base);
}
#endif	/* CONFIG_PARAVIRT */

#endif	/* __ASSEMBLY__ */

#ifdef CONFIG_X86_32
# include "pgtable_32.h"
#else
# include "pgtable_64.h"
#endif

/*
 * 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))


#define KERNEL_PGD_BOUNDARY	pgd_index(PAGE_OFFSET)
#define KERNEL_PGD_PTRS		(PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)

#ifndef __ASSEMBLY__

enum {
	PG_LEVEL_NONE,
	PG_LEVEL_4K,
	PG_LEVEL_2M,
	PG_LEVEL_1G,
	PG_LEVEL_NUM
};

#ifdef CONFIG_PROC_FS
extern void update_page_count(int level, unsigned long pages);
#else
static inline void update_page_count(int level, unsigned long pages) { }
#endif

/*
 * Helper function that returns the kernel pagetable entry controlling
 * the virtual address 'address'. NULL means no pagetable entry present.
 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 * as a pte too.
 */
extern pte_t *lookup_address(unsigned long address, unsigned int *level);

/* local pte updates need not use xchg for locking */
static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
{
	pte_t res = *ptep;

	/* Pure native function needs no input for mm, addr */
	native_pte_clear(NULL, 0, ptep);
	return res;
}

static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
				     pte_t *ptep , pte_t pte)
{
	native_set_pte(ptep, pte);
}

#ifndef CONFIG_PARAVIRT
/*
 * Rules for using pte_update - it must be called after any PTE update which
 * has not been done using the set_pte / clear_pte interfaces.  It is used by
 * shadow mode hypervisors to resynchronize the shadow page tables.  Kernel PTE
 * updates should either be sets, clears, or set_pte_atomic for P->P
 * transitions, which means this hook should only be called for user PTEs.
 * This hook implies a P->P protection or access change has taken place, which
 * requires a subsequent TLB flush.  The notification can optionally be delayed
 * until the TLB flush event by using the pte_update_defer form of the
 * interface, but care must be taken to assure that the flush happens while
 * still holding the same page table lock so that the shadow and primary pages
 * do not become out of sync on SMP.
 */
#define pte_update(mm, addr, ptep)		do { } while (0)
#define pte_update_defer(mm, addr, ptep)	do { } while (0)
#endif

/*
 * We only update the dirty/accessed state if we set
 * the dirty bit by hand in the kernel, since the hardware
 * will do the accessed bit for us, and we don't want to
 * race with other CPU's that might be updating the dirty
 * bit at the same time.
 */
struct vm_area_struct;

#define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
extern int ptep_set_access_flags(struct vm_area_struct *vma,
				 unsigned long address, pte_t *ptep,
				 pte_t entry, int dirty);

#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
				     unsigned long addr, pte_t *ptep);

#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
extern int ptep_clear_flush_young(struct vm_area_struct *vma,
				  unsigned long address, pte_t *ptep);

#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
				       pte_t *ptep)
{
	pte_t pte = native_ptep_get_and_clear(ptep);
	pte_update(mm, addr, ptep);
	return pte;
}

#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
					    unsigned long addr, pte_t *ptep,
					    int full)
{
	pte_t pte;
	if (full) {
		/*
		 * Full address destruction in progress; paravirt does not
		 * care about updates and native needs no locking
		 */
		pte = native_local_ptep_get_and_clear(ptep);
	} else {
		pte = ptep_get_and_clear(mm, addr, ptep);
	}
	return pte;
}

#define __HAVE_ARCH_PTEP_SET_WRPROTECT
static inline void ptep_set_wrprotect(struct mm_struct *mm,
				      unsigned long addr, pte_t *ptep)
{
	clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
	pte_update(mm, addr, ptep);
}

/*
 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
 *
 *  dst - pointer to pgd range anwhere on a pgd page
 *  src - ""
 *  count - the number of pgds to copy.
 *
 * dst and src can be on the same page, but the range must not overlap,
 * and must not cross a page boundary.
 */
static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
{
       memcpy(dst, src, count * sizeof(pgd_t));
}


#include <asm-generic/pgtable.h>
#endif	/* __ASSEMBLY__ */

#endif	/* _ASM_X86_PGTABLE_H */
Commit	Line	Data
6c386655 JF	1	#ifndef _ASM_X86_PGTABLE_H
	2	#define _ASM_X86_PGTABLE_H
	3
6c386655 JF	4	#define FIRST_USER_ADDRESS 0
6c386655 JF	5
43cdf5d6 JS	6	#define _PAGE_BIT_PRESENT 0 /* is present */
	7	#define _PAGE_BIT_RW 1 /* writeable */
	8	#define _PAGE_BIT_USER 2 /* userspace addressable */
	9	#define _PAGE_BIT_PWT 3 /* page write through */
	10	#define _PAGE_BIT_PCD 4 /* page cache disabled */
	11	#define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
	12	#define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
6c386655 JF	13	#define _PAGE_BIT_FILE 6
6c386655 JF	14	#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
9bf5a475	15	#define _PAGE_BIT_PAT 7 /* on 4KB pages */
6c386655 JF	16	#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
	17	#define _PAGE_BIT_UNUSED1 9 /* available for programmer */
	18	#define _PAGE_BIT_UNUSED2 10
	19	#define _PAGE_BIT_UNUSED3 11
9bf5a475	20	#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
6c386655 JF	21	#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
6c386655 JF	22
4226ab93 JF	23	#define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
	24	#define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
	25	#define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
	26	#define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
	27	#define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
	28	#define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
	29	#define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
	30	#define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
	31	#define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
	32	#define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
	33	#define _PAGE_UNUSED2 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED2)
	34	#define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
	35	#define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
	36	#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
6c386655 JF	37
6c386655 JF	38	#if defined(CONFIG_X86_64) \|\| defined(CONFIG_X86_PAE)
4226ab93	39	#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
6c386655	40	#else
4226ab93	41	#define _PAGE_NX (_AT(pteval_t, 0))
6c386655 JF	42	#endif
	43
	44	/* If _PAGE_PRESENT is clear, we use these: */
3cbaeafe JP	45	#define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping,
3cbaeafe JP	46	* saved PTE; unset:swap */
6c386655 JF	47	#define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
	48	pte_present gives true */
	49
3cbaeafe JP	50	#define _PAGE_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| \
	51	_PAGE_ACCESSED \| _PAGE_DIRTY)
	52	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED \| \
	53	_PAGE_DIRTY)
6c386655	54
86aaf4fd	55	/* Set of bits not changed in pte_modify */
59438c9f	56	#define _PAGE_CHG_MASK (PTE_PFN_MASK \| _PAGE_PCD \| _PAGE_PWT \| \
1c12c4cf	57	_PAGE_ACCESSED \| _PAGE_DIRTY)
6c386655	58
2e5d9c85	59	#define _PAGE_CACHE_MASK (_PAGE_PCD \| _PAGE_PWT)
	60	#define _PAGE_CACHE_WB (0)
	61	#define _PAGE_CACHE_WC (_PAGE_PWT)
	62	#define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
	63	#define _PAGE_CACHE_UC (_PAGE_PCD \| _PAGE_PWT)
	64
6c386655	65	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
3cbaeafe JP	66	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| \
	67	_PAGE_ACCESSED \| _PAGE_NX)
	68
	69	#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_RW \| \
	70	_PAGE_USER \| _PAGE_ACCESSED)
	71	#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	72	_PAGE_ACCESSED \| _PAGE_NX)
	73	#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	74	_PAGE_ACCESSED)
6c386655	75	#define PAGE_COPY PAGE_COPY_NOEXEC
3cbaeafe JP	76	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	77	_PAGE_ACCESSED \| _PAGE_NX)
	78	#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	79	_PAGE_ACCESSED)
6c386655	80
6c386655	81	#define __PAGE_KERNEL_EXEC \
8490638c	82	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_GLOBAL)
6c386655	83	#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC \| _PAGE_NX)
6c386655 JF	84
	85	#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
	86	#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
d2e626f4	87	#define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC \| _PAGE_PCD \| _PAGE_PWT)
b310f381	88	#define __PAGE_KERNEL_WC (__PAGE_KERNEL \| _PAGE_CACHE_WC)
6c386655	89	#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL \| _PAGE_PCD \| _PAGE_PWT)
d546b67a	90	#define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL \| _PAGE_PCD)
6c386655 JF	91	#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX \| _PAGE_USER)
	92	#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL \| _PAGE_PCD \| _PAGE_PWT)
	93	#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL \| _PAGE_PSE)
3a9e189d	94	#define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL \| _PAGE_CACHE_UC \| _PAGE_PSE)
6c386655 JF	95	#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC \| _PAGE_PSE)
6c386655 JF	96
8490638c JF	97	#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
	98	#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
	99	#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
	100	#define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
	101	#define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
	102	#define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
	103	#define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
	104	#define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
	105	#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
3a9e189d	106	#define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
8490638c JF	107	#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
	108	#define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
	109	#define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
6c386655 JF	110
	111	/* xwr */
	112	#define __P000 PAGE_NONE
	113	#define __P001 PAGE_READONLY
	114	#define __P010 PAGE_COPY
	115	#define __P011 PAGE_COPY
	116	#define __P100 PAGE_READONLY_EXEC
	117	#define __P101 PAGE_READONLY_EXEC
	118	#define __P110 PAGE_COPY_EXEC
	119	#define __P111 PAGE_COPY_EXEC
	120
	121	#define __S000 PAGE_NONE
	122	#define __S001 PAGE_READONLY
	123	#define __S010 PAGE_SHARED
	124	#define __S011 PAGE_SHARED
	125	#define __S100 PAGE_READONLY_EXEC
	126	#define __S101 PAGE_READONLY_EXEC
	127	#define __S110 PAGE_SHARED_EXEC
	128	#define __S111 PAGE_SHARED_EXEC
	129
4614139c	130	#ifndef __ASSEMBLY__
195466dc	131
8405b122 JF	132	/*
	133	* ZERO_PAGE is a global shared page that is always zero: used
	134	* for zero-mapped memory areas etc..
	135	*/
3cbaeafe	136	extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
8405b122 JF	137	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
8405b122 JF	138
e3ed910d JF	139	extern spinlock_t pgd_lock;
e3ed910d JF	140	extern struct list_head pgd_list;
8405b122	141
4614139c JF	142	/*
	143	* The following only work if pte_present() is true.
	144	* Undefined behaviour if not..
	145	*/
3cbaeafe JP	146	static inline int pte_dirty(pte_t pte)
3cbaeafe JP	147	{
a15af1c9	148	return pte_flags(pte) & _PAGE_DIRTY;
3cbaeafe JP	149	}
	150
	151	static inline int pte_young(pte_t pte)
	152	{
a15af1c9	153	return pte_flags(pte) & _PAGE_ACCESSED;
3cbaeafe JP	154	}
	155
	156	static inline int pte_write(pte_t pte)
	157	{
a15af1c9	158	return pte_flags(pte) & _PAGE_RW;
3cbaeafe JP	159	}
	160
	161	static inline int pte_file(pte_t pte)
	162	{
a15af1c9	163	return pte_flags(pte) & _PAGE_FILE;
3cbaeafe JP	164	}
	165
	166	static inline int pte_huge(pte_t pte)
	167	{
a15af1c9	168	return pte_flags(pte) & _PAGE_PSE;
4614139c JF	169	}
4614139c JF	170
3cbaeafe JP	171	static inline int pte_global(pte_t pte)
3cbaeafe JP	172	{
a15af1c9	173	return pte_flags(pte) & _PAGE_GLOBAL;
3cbaeafe JP	174	}
	175
	176	static inline int pte_exec(pte_t pte)
	177	{
a15af1c9	178	return !(pte_flags(pte) & _PAGE_NX);
3cbaeafe JP	179	}
3cbaeafe JP	180
7e675137 NP	181	static inline int pte_special(pte_t pte)
	182	{
	183	return 0;
	184	}
	185
3cbaeafe JP	186	static inline int pmd_large(pmd_t pte)
	187	{
	188	return (pmd_val(pte) & (_PAGE_PSE \| _PAGE_PRESENT)) ==
	189	(_PAGE_PSE \| _PAGE_PRESENT);
	190	}
	191
	192	static inline pte_t pte_mkclean(pte_t pte)
	193	{
4226ab93	194	return __pte(pte_val(pte) & ~_PAGE_DIRTY);
3cbaeafe JP	195	}
	196
	197	static inline pte_t pte_mkold(pte_t pte)
	198	{
4226ab93	199	return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
3cbaeafe JP	200	}
	201
	202	static inline pte_t pte_wrprotect(pte_t pte)
	203	{
4226ab93	204	return __pte(pte_val(pte) & ~_PAGE_RW);
3cbaeafe JP	205	}
	206
	207	static inline pte_t pte_mkexec(pte_t pte)
	208	{
4226ab93	209	return __pte(pte_val(pte) & ~_PAGE_NX);
3cbaeafe JP	210	}
	211
	212	static inline pte_t pte_mkdirty(pte_t pte)
	213	{
	214	return __pte(pte_val(pte) \| _PAGE_DIRTY);
	215	}
	216
	217	static inline pte_t pte_mkyoung(pte_t pte)
	218	{
	219	return __pte(pte_val(pte) \| _PAGE_ACCESSED);
	220	}
	221
	222	static inline pte_t pte_mkwrite(pte_t pte)
	223	{
	224	return __pte(pte_val(pte) \| _PAGE_RW);
	225	}
	226
	227	static inline pte_t pte_mkhuge(pte_t pte)
	228	{
	229	return __pte(pte_val(pte) \| _PAGE_PSE);
	230	}
	231
	232	static inline pte_t pte_clrhuge(pte_t pte)
	233	{
4226ab93	234	return __pte(pte_val(pte) & ~_PAGE_PSE);
3cbaeafe JP	235	}
	236
	237	static inline pte_t pte_mkglobal(pte_t pte)
	238	{
	239	return __pte(pte_val(pte) \| _PAGE_GLOBAL);
	240	}
	241
	242	static inline pte_t pte_clrglobal(pte_t pte)
	243	{
4226ab93	244	return __pte(pte_val(pte) & ~_PAGE_GLOBAL);
3cbaeafe	245	}
4614139c	246
7e675137 NP	247	static inline pte_t pte_mkspecial(pte_t pte)
	248	{
	249	return pte;
	250	}
	251
6fdc05d4 JF	252	extern pteval_t __supported_pte_mask;
	253
	254	static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
	255	{
	256	return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	257	pgprot_val(pgprot)) & __supported_pte_mask);
	258	}
	259
	260	static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
	261	{
	262	return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	263	pgprot_val(pgprot)) & __supported_pte_mask);
	264	}
	265
38472311 IM	266	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	267	{
	268	pteval_t val = pte_val(pte);
	269
	270	/*
	271	* Chop off the NX bit (if present), and add the NX portion of
	272	* the newprot (if present):
	273	*/
1c12c4cf VP	274	val &= _PAGE_CHG_MASK;
1c12c4cf VP	275	val \|= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
38472311 IM	276
	277	return __pte(val);
	278	}
	279
1c12c4cf VP	280	/* mprotect needs to preserve PAT bits when updating vm_page_prot */
	281	#define pgprot_modify pgprot_modify
	282	static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
	283	{
	284	pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
	285	pgprotval_t addbits = pgprot_val(newprot);
	286	return __pgprot(preservebits \| addbits);
	287	}
	288
59438c9f	289	#define pte_pgprot(x) __pgprot(pte_flags(x) & ~PTE_PFN_MASK)
c6ca18eb	290
1e8e23bc AK	291	#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
1e8e23bc AK	292
f0970c13	293	#ifndef __ASSEMBLY__
	294	#define __HAVE_PHYS_MEM_ACCESS_PROT
	295	struct file;
	296	pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
	297	unsigned long size, pgprot_t vma_prot);
	298	int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
	299	unsigned long size, pgprot_t *vma_prot);
	300	#endif
	301
d494a961 JF	302	/* Install a pte for a particular vaddr in kernel space. */
	303	void set_pte_vaddr(unsigned long vaddr, pte_t pte);
	304
a312b37b EH	305	#ifdef CONFIG_X86_32
	306	extern void native_pagetable_setup_start(pgd_t *base);
	307	extern void native_pagetable_setup_done(pgd_t *base);
	308	#else
	309	static inline void native_pagetable_setup_start(pgd_t *base) {}
	310	static inline void native_pagetable_setup_done(pgd_t *base) {}
	311	#endif
	312
4891645e JF	313	#ifdef CONFIG_PARAVIRT
	314	#include <asm/paravirt.h>
	315	#else /* !CONFIG_PARAVIRT */
	316	#define set_pte(ptep, pte) native_set_pte(ptep, pte)
	317	#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
	318
	319	#define set_pte_present(mm, addr, ptep, pte) \
	320	native_set_pte_present(mm, addr, ptep, pte)
	321	#define set_pte_atomic(ptep, pte) \
	322	native_set_pte_atomic(ptep, pte)
	323
	324	#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
	325
	326	#ifndef __PAGETABLE_PUD_FOLDED
	327	#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
	328	#define pgd_clear(pgd) native_pgd_clear(pgd)
	329	#endif
	330
	331	#ifndef set_pud
	332	# define set_pud(pudp, pud) native_set_pud(pudp, pud)
	333	#endif
	334
	335	#ifndef __PAGETABLE_PMD_FOLDED
	336	#define pud_clear(pud) native_pud_clear(pud)
	337	#endif
	338
	339	#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
	340	#define pmd_clear(pmd) native_pmd_clear(pmd)
	341
	342	#define pte_update(mm, addr, ptep) do { } while (0)
	343	#define pte_update_defer(mm, addr, ptep) do { } while (0)
a312b37b EH	344
	345	static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
	346	{
	347	native_pagetable_setup_start(base);
	348	}
	349
	350	static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
	351	{
	352	native_pagetable_setup_done(base);
	353	}
4891645e JF	354	#endif /* CONFIG_PARAVIRT */
4891645e JF	355
4614139c JF	356	#endif /* __ASSEMBLY__ */
4614139c JF	357
96a388de TG	358	#ifdef CONFIG_X86_32
	359	# include "pgtable_32.h"
	360	#else
	361	# include "pgtable_64.h"
	362	#endif
6c386655	363
fb15a9b3 JF	364	/*
	365	* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
	366	*
	367	* this macro returns the index of the entry in the pgd page which would
	368	* control the given virtual address
	369	*/
	370	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
	371
	372	/*
	373	* pgd_offset() returns a (pgd_t *)
	374	* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
	375	*/
	376	#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
	377	/*
	378	* a shortcut which implies the use of the kernel's pgd, instead
	379	* of a process's
	380	*/
	381	#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
	382
	383
68db065c JF	384	#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
	385	#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
	386
195466dc JF	387	#ifndef __ASSEMBLY__
195466dc JF	388
30551bb3 TG	389	enum {
	390	PG_LEVEL_NONE,
	391	PG_LEVEL_4K,
	392	PG_LEVEL_2M,
86f03989	393	PG_LEVEL_1G,
ce0c0e50	394	PG_LEVEL_NUM
30551bb3 TG	395	};
30551bb3 TG	396
65280e61 TG	397	#ifdef CONFIG_PROC_FS
	398	extern void update_page_count(int level, unsigned long pages);
	399	#else
	400	static inline void update_page_count(int level, unsigned long pages) { }
	401	#endif
ce0c0e50	402
0a663088 TG	403	/*
	404	* Helper function that returns the kernel pagetable entry controlling
	405	* the virtual address 'address'. NULL means no pagetable entry present.
	406	* NOTE: the return type is pte_t but if the pmd is PSE then we return it
	407	* as a pte too.
	408	*/
da7bfc50	409	extern pte_t lookup_address(unsigned long address, unsigned int level);
0a663088	410
4891645e JF	411	/* local pte updates need not use xchg for locking */
	412	static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
	413	{
	414	pte_t res = *ptep;
	415
	416	/* Pure native function needs no input for mm, addr */
	417	native_pte_clear(NULL, 0, ptep);
	418	return res;
	419	}
	420
	421	static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
	422	pte_t *ptep , pte_t pte)
	423	{
	424	native_set_pte(ptep, pte);
	425	}
	426
195466dc JF	427	#ifndef CONFIG_PARAVIRT
	428	/*
	429	* Rules for using pte_update - it must be called after any PTE update which
	430	* has not been done using the set_pte / clear_pte interfaces. It is used by
	431	* shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
	432	* updates should either be sets, clears, or set_pte_atomic for P->P
	433	* transitions, which means this hook should only be called for user PTEs.
	434	* This hook implies a P->P protection or access change has taken place, which
	435	* requires a subsequent TLB flush. The notification can optionally be delayed
	436	* until the TLB flush event by using the pte_update_defer form of the
	437	* interface, but care must be taken to assure that the flush happens while
	438	* still holding the same page table lock so that the shadow and primary pages
	439	* do not become out of sync on SMP.
	440	*/
	441	#define pte_update(mm, addr, ptep) do { } while (0)
	442	#define pte_update_defer(mm, addr, ptep) do { } while (0)
	443	#endif
	444
195466dc JF	445	/*
	446	* We only update the dirty/accessed state if we set
	447	* the dirty bit by hand in the kernel, since the hardware
	448	* will do the accessed bit for us, and we don't want to
	449	* race with other CPU's that might be updating the dirty
	450	* bit at the same time.
	451	*/
bea41808 JF	452	struct vm_area_struct;
bea41808 JF	453
195466dc	454	#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
ee5aa8d3 JF	455	extern int ptep_set_access_flags(struct vm_area_struct *vma,
	456	unsigned long address, pte_t *ptep,
	457	pte_t entry, int dirty);
195466dc JF	458
195466dc JF	459	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
f9fbf1a3 JF	460	extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
f9fbf1a3 JF	461	unsigned long addr, pte_t *ptep);
195466dc JF	462
195466dc JF	463	#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
c20311e1 JF	464	extern int ptep_clear_flush_young(struct vm_area_struct *vma,
c20311e1 JF	465	unsigned long address, pte_t *ptep);
195466dc JF	466
195466dc JF	467	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
3cbaeafe JP	468	static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
3cbaeafe JP	469	pte_t *ptep)
195466dc JF	470	{
	471	pte_t pte = native_ptep_get_and_clear(ptep);
	472	pte_update(mm, addr, ptep);
	473	return pte;
	474	}
	475
	476	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
3cbaeafe JP	477	static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
	478	unsigned long addr, pte_t *ptep,
	479	int full)
195466dc JF	480	{
	481	pte_t pte;
	482	if (full) {
	483	/*
	484	* Full address destruction in progress; paravirt does not
	485	* care about updates and native needs no locking
	486	*/
	487	pte = native_local_ptep_get_and_clear(ptep);
	488	} else {
	489	pte = ptep_get_and_clear(mm, addr, ptep);
	490	}
	491	return pte;
	492	}
	493
	494	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
3cbaeafe JP	495	static inline void ptep_set_wrprotect(struct mm_struct *mm,
3cbaeafe JP	496	unsigned long addr, pte_t *ptep)
195466dc	497	{
d8d89827	498	clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
195466dc JF	499	pte_update(mm, addr, ptep);
	500	}
	501
85958b46 JF	502	/*
	503	* clone_pgd_range(pgd_t dst, pgd_t src, int count);
	504	*
	505	* dst - pointer to pgd range anwhere on a pgd page
	506	* src - ""
	507	* count - the number of pgds to copy.
	508	*
	509	* dst and src can be on the same page, but the range must not overlap,
	510	* and must not cross a page boundary.
	511	*/
	512	static inline void clone_pgd_range(pgd_t dst, pgd_t src, int count)
	513	{
	514	memcpy(dst, src, count * sizeof(pgd_t));
	515	}
	516
	517
195466dc JF	518	#include <asm-generic/pgtable.h>
	519	#endif /* __ASSEMBLY__ */
	520
6c386655	521	#endif /* _ASM_X86_PGTABLE_H */