[mirror_ubuntu-bionic-kernel.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_SPECIAL	_PAGE_BIT_UNUSED1
#define _PAGE_BIT_CPA_TEST	_PAGE_BIT_UNUSED1
#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)
#define _PAGE_SPECIAL	(_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
#define _PAGE_CPA_TEST	(_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
#define __HAVE_ARCH_PTE_SPECIAL

#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_SPECIAL | _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

/*
 * early identity mapping  pte attrib macros.
 */
#ifdef CONFIG_X86_64
#define __PAGE_KERNEL_IDENT_LARGE_EXEC	__PAGE_KERNEL_LARGE_EXEC
#else
#define PTE_IDENT_ATTR	 0x007		/* PRESENT+RW+USER */
#define PDE_IDENT_ATTR	 0x067		/* PRESENT+RW+USER+DIRTY+ACCESSED */
#define PGD_IDENT_ATTR	 0x001		/* PRESENT (no other attributes) */
#endif

#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 pte_val(pte) & _PAGE_SPECIAL;
}

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(pte_val(pte) | _PAGE_SPECIAL);
}

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_FLAGS_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
	1	#ifndef _ASM_X86_PGTABLE_H
	2	#define _ASM_X86_PGTABLE_H
	3
	4	#define FIRST_USER_ADDRESS 0
	5
	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) */
	13	#define _PAGE_BIT_FILE 6
	14	#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
	15	#define _PAGE_BIT_PAT 7 /* on 4KB pages */
	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
	20	#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
	21	#define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
	22	#define _PAGE_BIT_CPA_TEST _PAGE_BIT_UNUSED1
	23	#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
	24
	25	#define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
	26	#define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
	27	#define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
	28	#define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
	29	#define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
	30	#define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
	31	#define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
	32	#define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
	33	#define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
	34	#define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
	35	#define _PAGE_UNUSED2 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED2)
	36	#define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
	37	#define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
	38	#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
	39	#define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
	40	#define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
	41	#define __HAVE_ARCH_PTE_SPECIAL
	42
	43	#if defined(CONFIG_X86_64) \|\| defined(CONFIG_X86_PAE)
	44	#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
	45	#else
	46	#define _PAGE_NX (_AT(pteval_t, 0))
	47	#endif
	48
	49	/* If _PAGE_PRESENT is clear, we use these: */
	50	#define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping,
	51	* saved PTE; unset:swap */
	52	#define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
	53	pte_present gives true */
	54
	55	#define _PAGE_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| \
	56	_PAGE_ACCESSED \| _PAGE_DIRTY)
	57	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED \| \
	58	_PAGE_DIRTY)
	59
	60	/* Set of bits not changed in pte_modify */
	61	#define _PAGE_CHG_MASK (PTE_PFN_MASK \| _PAGE_PCD \| _PAGE_PWT \| \
	62	_PAGE_SPECIAL \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	63
	64	#define _PAGE_CACHE_MASK (_PAGE_PCD \| _PAGE_PWT)
	65	#define _PAGE_CACHE_WB (0)
	66	#define _PAGE_CACHE_WC (_PAGE_PWT)
	67	#define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
	68	#define _PAGE_CACHE_UC (_PAGE_PCD \| _PAGE_PWT)
	69
	70	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
	71	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| \
	72	_PAGE_ACCESSED \| _PAGE_NX)
	73
	74	#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_RW \| \
	75	_PAGE_USER \| _PAGE_ACCESSED)
	76	#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	77	_PAGE_ACCESSED \| _PAGE_NX)
	78	#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	79	_PAGE_ACCESSED)
	80	#define PAGE_COPY PAGE_COPY_NOEXEC
	81	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	82	_PAGE_ACCESSED \| _PAGE_NX)
	83	#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	84	_PAGE_ACCESSED)
	85
	86	#define __PAGE_KERNEL_EXEC \
	87	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_GLOBAL)
	88	#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC \| _PAGE_NX)
	89
	90	#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
	91	#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
	92	#define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC \| _PAGE_PCD \| _PAGE_PWT)
	93	#define __PAGE_KERNEL_WC (__PAGE_KERNEL \| _PAGE_CACHE_WC)
	94	#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL \| _PAGE_PCD \| _PAGE_PWT)
	95	#define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL \| _PAGE_PCD)
	96	#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX \| _PAGE_USER)
	97	#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL \| _PAGE_PCD \| _PAGE_PWT)
	98	#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL \| _PAGE_PSE)
	99	#define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL \| _PAGE_CACHE_UC \| _PAGE_PSE)
	100	#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC \| _PAGE_PSE)
	101
	102	#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
	103	#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
	104	#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
	105	#define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
	106	#define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
	107	#define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
	108	#define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
	109	#define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
	110	#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
	111	#define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
	112	#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
	113	#define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
	114	#define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
	115
	116	/* xwr */
	117	#define __P000 PAGE_NONE
	118	#define __P001 PAGE_READONLY
	119	#define __P010 PAGE_COPY
	120	#define __P011 PAGE_COPY
	121	#define __P100 PAGE_READONLY_EXEC
	122	#define __P101 PAGE_READONLY_EXEC
	123	#define __P110 PAGE_COPY_EXEC
	124	#define __P111 PAGE_COPY_EXEC
	125
	126	#define __S000 PAGE_NONE
	127	#define __S001 PAGE_READONLY
	128	#define __S010 PAGE_SHARED
	129	#define __S011 PAGE_SHARED
	130	#define __S100 PAGE_READONLY_EXEC
	131	#define __S101 PAGE_READONLY_EXEC
	132	#define __S110 PAGE_SHARED_EXEC
	133	#define __S111 PAGE_SHARED_EXEC
	134
	135	/*
	136	* early identity mapping pte attrib macros.
	137	*/
	138	#ifdef CONFIG_X86_64
	139	#define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
	140	#else
	141	#define PTE_IDENT_ATTR 0x007 /* PRESENT+RW+USER */
	142	#define PDE_IDENT_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */
	143	#define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
	144	#endif
	145
	146	#ifndef __ASSEMBLY__
	147
	148	/*
	149	* ZERO_PAGE is a global shared page that is always zero: used
	150	* for zero-mapped memory areas etc..
	151	*/
	152	extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
	153	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
	154
	155	extern spinlock_t pgd_lock;
	156	extern struct list_head pgd_list;
	157
	158	/*
	159	* The following only work if pte_present() is true.
	160	* Undefined behaviour if not..
	161	*/
	162	static inline int pte_dirty(pte_t pte)
	163	{
	164	return pte_flags(pte) & _PAGE_DIRTY;
	165	}
	166
	167	static inline int pte_young(pte_t pte)
	168	{
	169	return pte_flags(pte) & _PAGE_ACCESSED;
	170	}
	171
	172	static inline int pte_write(pte_t pte)
	173	{
	174	return pte_flags(pte) & _PAGE_RW;
	175	}
	176
	177	static inline int pte_file(pte_t pte)
	178	{
	179	return pte_flags(pte) & _PAGE_FILE;
	180	}
	181
	182	static inline int pte_huge(pte_t pte)
	183	{
	184	return pte_flags(pte) & _PAGE_PSE;
	185	}
	186
	187	static inline int pte_global(pte_t pte)
	188	{
	189	return pte_flags(pte) & _PAGE_GLOBAL;
	190	}
	191
	192	static inline int pte_exec(pte_t pte)
	193	{
	194	return !(pte_flags(pte) & _PAGE_NX);
	195	}
	196
	197	static inline int pte_special(pte_t pte)
	198	{
	199	return pte_val(pte) & _PAGE_SPECIAL;
	200	}
	201
	202	static inline int pmd_large(pmd_t pte)
	203	{
	204	return (pmd_val(pte) & (_PAGE_PSE \| _PAGE_PRESENT)) ==
	205	(_PAGE_PSE \| _PAGE_PRESENT);
	206	}
	207
	208	static inline pte_t pte_mkclean(pte_t pte)
	209	{
	210	return __pte(pte_val(pte) & ~_PAGE_DIRTY);
	211	}
	212
	213	static inline pte_t pte_mkold(pte_t pte)
	214	{
	215	return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
	216	}
	217
	218	static inline pte_t pte_wrprotect(pte_t pte)
	219	{
	220	return __pte(pte_val(pte) & ~_PAGE_RW);
	221	}
	222
	223	static inline pte_t pte_mkexec(pte_t pte)
	224	{
	225	return __pte(pte_val(pte) & ~_PAGE_NX);
	226	}
	227
	228	static inline pte_t pte_mkdirty(pte_t pte)
	229	{
	230	return __pte(pte_val(pte) \| _PAGE_DIRTY);
	231	}
	232
	233	static inline pte_t pte_mkyoung(pte_t pte)
	234	{
	235	return __pte(pte_val(pte) \| _PAGE_ACCESSED);
	236	}
	237
	238	static inline pte_t pte_mkwrite(pte_t pte)
	239	{
	240	return __pte(pte_val(pte) \| _PAGE_RW);
	241	}
	242
	243	static inline pte_t pte_mkhuge(pte_t pte)
	244	{
	245	return __pte(pte_val(pte) \| _PAGE_PSE);
	246	}
	247
	248	static inline pte_t pte_clrhuge(pte_t pte)
	249	{
	250	return __pte(pte_val(pte) & ~_PAGE_PSE);
	251	}
	252
	253	static inline pte_t pte_mkglobal(pte_t pte)
	254	{
	255	return __pte(pte_val(pte) \| _PAGE_GLOBAL);
	256	}
	257
	258	static inline pte_t pte_clrglobal(pte_t pte)
	259	{
	260	return __pte(pte_val(pte) & ~_PAGE_GLOBAL);
	261	}
	262
	263	static inline pte_t pte_mkspecial(pte_t pte)
	264	{
	265	return __pte(pte_val(pte) \| _PAGE_SPECIAL);
	266	}
	267
	268	extern pteval_t __supported_pte_mask;
	269
	270	static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
	271	{
	272	return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	273	pgprot_val(pgprot)) & __supported_pte_mask);
	274	}
	275
	276	static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
	277	{
	278	return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	279	pgprot_val(pgprot)) & __supported_pte_mask);
	280	}
	281
	282	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	283	{
	284	pteval_t val = pte_val(pte);
	285
	286	/*
	287	* Chop off the NX bit (if present), and add the NX portion of
	288	* the newprot (if present):
	289	*/
	290	val &= _PAGE_CHG_MASK;
	291	val \|= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
	292
	293	return __pte(val);
	294	}
	295
	296	/* mprotect needs to preserve PAT bits when updating vm_page_prot */
	297	#define pgprot_modify pgprot_modify
	298	static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
	299	{
	300	pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
	301	pgprotval_t addbits = pgprot_val(newprot);
	302	return __pgprot(preservebits \| addbits);
	303	}
	304
	305	#define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
	306
	307	#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
	308
	309	#ifndef __ASSEMBLY__
	310	#define __HAVE_PHYS_MEM_ACCESS_PROT
	311	struct file;
	312	pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
	313	unsigned long size, pgprot_t vma_prot);
	314	int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
	315	unsigned long size, pgprot_t *vma_prot);
	316	#endif
	317
	318	/* Install a pte for a particular vaddr in kernel space. */
	319	void set_pte_vaddr(unsigned long vaddr, pte_t pte);
	320
	321	#ifdef CONFIG_X86_32
	322	extern void native_pagetable_setup_start(pgd_t *base);
	323	extern void native_pagetable_setup_done(pgd_t *base);
	324	#else
	325	static inline void native_pagetable_setup_start(pgd_t *base) {}
	326	static inline void native_pagetable_setup_done(pgd_t *base) {}
	327	#endif
	328
	329	#ifdef CONFIG_PARAVIRT
	330	#include <asm/paravirt.h>
	331	#else /* !CONFIG_PARAVIRT */
	332	#define set_pte(ptep, pte) native_set_pte(ptep, pte)
	333	#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
	334
	335	#define set_pte_present(mm, addr, ptep, pte) \
	336	native_set_pte_present(mm, addr, ptep, pte)
	337	#define set_pte_atomic(ptep, pte) \
	338	native_set_pte_atomic(ptep, pte)
	339
	340	#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
	341
	342	#ifndef __PAGETABLE_PUD_FOLDED
	343	#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
	344	#define pgd_clear(pgd) native_pgd_clear(pgd)
	345	#endif
	346
	347	#ifndef set_pud
	348	# define set_pud(pudp, pud) native_set_pud(pudp, pud)
	349	#endif
	350
	351	#ifndef __PAGETABLE_PMD_FOLDED
	352	#define pud_clear(pud) native_pud_clear(pud)
	353	#endif
	354
	355	#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
	356	#define pmd_clear(pmd) native_pmd_clear(pmd)
	357
	358	#define pte_update(mm, addr, ptep) do { } while (0)
	359	#define pte_update_defer(mm, addr, ptep) do { } while (0)
	360
	361	static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
	362	{
	363	native_pagetable_setup_start(base);
	364	}
	365
	366	static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
	367	{
	368	native_pagetable_setup_done(base);
	369	}
	370	#endif /* CONFIG_PARAVIRT */
	371
	372	#endif /* __ASSEMBLY__ */
	373
	374	#ifdef CONFIG_X86_32
	375	# include "pgtable_32.h"
	376	#else
	377	# include "pgtable_64.h"
	378	#endif
	379
	380	/*
	381	* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
	382	*
	383	* this macro returns the index of the entry in the pgd page which would
	384	* control the given virtual address
	385	*/
	386	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
	387
	388	/*
	389	* pgd_offset() returns a (pgd_t *)
	390	* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
	391	*/
	392	#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
	393	/*
	394	* a shortcut which implies the use of the kernel's pgd, instead
	395	* of a process's
	396	*/
	397	#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
	398
	399
	400	#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
	401	#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
	402
	403	#ifndef __ASSEMBLY__
	404
	405	enum {
	406	PG_LEVEL_NONE,
	407	PG_LEVEL_4K,
	408	PG_LEVEL_2M,
	409	PG_LEVEL_1G,
	410	PG_LEVEL_NUM
	411	};
	412
	413	#ifdef CONFIG_PROC_FS
	414	extern void update_page_count(int level, unsigned long pages);
	415	#else
	416	static inline void update_page_count(int level, unsigned long pages) { }
	417	#endif
	418
	419	/*
	420	* Helper function that returns the kernel pagetable entry controlling
	421	* the virtual address 'address'. NULL means no pagetable entry present.
	422	* NOTE: the return type is pte_t but if the pmd is PSE then we return it
	423	* as a pte too.
	424	*/
	425	extern pte_t lookup_address(unsigned long address, unsigned int level);
	426
	427	/* local pte updates need not use xchg for locking */
	428	static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
	429	{
	430	pte_t res = *ptep;
	431
	432	/* Pure native function needs no input for mm, addr */
	433	native_pte_clear(NULL, 0, ptep);
	434	return res;
	435	}
	436
	437	static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
	438	pte_t *ptep , pte_t pte)
	439	{
	440	native_set_pte(ptep, pte);
	441	}
	442
	443	#ifndef CONFIG_PARAVIRT
	444	/*
	445	* Rules for using pte_update - it must be called after any PTE update which
	446	* has not been done using the set_pte / clear_pte interfaces. It is used by
	447	* shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
	448	* updates should either be sets, clears, or set_pte_atomic for P->P
	449	* transitions, which means this hook should only be called for user PTEs.
	450	* This hook implies a P->P protection or access change has taken place, which
	451	* requires a subsequent TLB flush. The notification can optionally be delayed
	452	* until the TLB flush event by using the pte_update_defer form of the
	453	* interface, but care must be taken to assure that the flush happens while
	454	* still holding the same page table lock so that the shadow and primary pages
	455	* do not become out of sync on SMP.
	456	*/
	457	#define pte_update(mm, addr, ptep) do { } while (0)
	458	#define pte_update_defer(mm, addr, ptep) do { } while (0)
	459	#endif
	460
	461	/*
	462	* We only update the dirty/accessed state if we set
	463	* the dirty bit by hand in the kernel, since the hardware
	464	* will do the accessed bit for us, and we don't want to
	465	* race with other CPU's that might be updating the dirty
	466	* bit at the same time.
	467	*/
	468	struct vm_area_struct;
	469
	470	#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
	471	extern int ptep_set_access_flags(struct vm_area_struct *vma,
	472	unsigned long address, pte_t *ptep,
	473	pte_t entry, int dirty);
	474
	475	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
	476	extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
	477	unsigned long addr, pte_t *ptep);
	478
	479	#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
	480	extern int ptep_clear_flush_young(struct vm_area_struct *vma,
	481	unsigned long address, pte_t *ptep);
	482
	483	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
	484	static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
	485	pte_t *ptep)
	486	{
	487	pte_t pte = native_ptep_get_and_clear(ptep);
	488	pte_update(mm, addr, ptep);
	489	return pte;
	490	}
	491
	492	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
	493	static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
	494	unsigned long addr, pte_t *ptep,
	495	int full)
	496	{
	497	pte_t pte;
	498	if (full) {
	499	/*
	500	* Full address destruction in progress; paravirt does not
	501	* care about updates and native needs no locking
	502	*/
	503	pte = native_local_ptep_get_and_clear(ptep);
	504	} else {
	505	pte = ptep_get_and_clear(mm, addr, ptep);
	506	}
	507	return pte;
	508	}
	509
	510	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
	511	static inline void ptep_set_wrprotect(struct mm_struct *mm,
	512	unsigned long addr, pte_t *ptep)
	513	{
	514	clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
	515	pte_update(mm, addr, ptep);
	516	}
	517
	518	/*
	519	* clone_pgd_range(pgd_t dst, pgd_t src, int count);
	520	*
	521	* dst - pointer to pgd range anwhere on a pgd page
	522	* src - ""
	523	* count - the number of pgds to copy.
	524	*
	525	* dst and src can be on the same page, but the range must not overlap,
	526	* and must not cross a page boundary.
	527	*/
	528	static inline void clone_pgd_range(pgd_t dst, pgd_t src, int count)
	529	{
	530	memcpy(dst, src, count * sizeof(pgd_t));
	531	}
	532
	533
	534	#include <asm-generic/pgtable.h>
	535	#endif /* __ASSEMBLY__ */
	536
	537	#endif /* _ASM_X86_PGTABLE_H */