[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_IOMAP		10	/* flag used to indicate IO mapping */
#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_IOMAP	(_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
#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_IO		(__PAGE_KERNEL | _PAGE_IOMAP)
#define __PAGE_KERNEL_IO_NOCACHE	(__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
#define __PAGE_KERNEL_IO_UC_MINUS	(__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
#define __PAGE_KERNEL_IO_WC		(__PAGE_KERNEL_WC | _PAGE_IOMAP)

#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)

#define PAGE_KERNEL_IO			__pgprot(__PAGE_KERNEL_IO)
#define PAGE_KERNEL_IO_NOCACHE		__pgprot(__PAGE_KERNEL_IO_NOCACHE)
#define PAGE_KERNEL_IO_UC_MINUS		__pgprot(__PAGE_KERNEL_IO_UC_MINUS)
#define PAGE_KERNEL_IO_WC		__pgprot(__PAGE_KERNEL_IO_WC)

/*         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	 0x003		/* PRESENT+RW */
#define PDE_IDENT_ATTR	 0x063		/* PRESENT+RW+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_flags(pte) & _PAGE_SPECIAL;
}

static inline unsigned long pte_pfn(pte_t pte)
{
	return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
}

#define pte_page(pte)	pfn_to_page(pte_pfn(pte))

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

extern int arch_report_meminfo(char *page);

#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
77ef50a5 VN	1	#ifndef ASM_X86__PGTABLE_H
77ef50a5 VN	2	#define ASM_X86__PGTABLE_H
6c386655	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+ */
6c386655 JF	17	#define _PAGE_BIT_UNUSED1 9 /* available for programmer */
be43d728	18	#define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */
6c386655	19	#define _PAGE_BIT_UNUSED3 11
9bf5a475	20	#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
a0a8f536	21	#define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
110e0358	22	#define _PAGE_BIT_CPA_TEST _PAGE_BIT_UNUSED1
6c386655 JF	23	#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
6c386655 JF	24
4226ab93 JF	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)
be43d728	35	#define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
4226ab93 JF	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)
a0a8f536	39	#define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
110e0358	40	#define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
a0a8f536	41	#define __HAVE_ARCH_PTE_SPECIAL
6c386655 JF	42
6c386655 JF	43	#if defined(CONFIG_X86_64) \|\| defined(CONFIG_X86_PAE)
4226ab93	44	#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
6c386655	45	#else
4226ab93	46	#define _PAGE_NX (_AT(pteval_t, 0))
6c386655 JF	47	#endif
	48
	49	/* If _PAGE_PRESENT is clear, we use these: */
3cbaeafe JP	50	#define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping,
3cbaeafe JP	51	* saved PTE; unset:swap */
6c386655 JF	52	#define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
	53	pte_present gives true */
	54
3cbaeafe JP	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)
6c386655	59
86aaf4fd	60	/* Set of bits not changed in pte_modify */
59438c9f	61	#define _PAGE_CHG_MASK (PTE_PFN_MASK \| _PAGE_PCD \| _PAGE_PWT \| \
a0a8f536	62	_PAGE_SPECIAL \| _PAGE_ACCESSED \| _PAGE_DIRTY)
6c386655	63
2e5d9c85	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
6c386655	70	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
3cbaeafe JP	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)
6c386655	80	#define PAGE_COPY PAGE_COPY_NOEXEC
3cbaeafe JP	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)
6c386655	85
6c386655	86	#define __PAGE_KERNEL_EXEC \
8490638c	87	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_GLOBAL)
6c386655	88	#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC \| _PAGE_NX)
6c386655 JF	89
	90	#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
	91	#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
d2e626f4	92	#define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC \| _PAGE_PCD \| _PAGE_PWT)
b310f381	93	#define __PAGE_KERNEL_WC (__PAGE_KERNEL \| _PAGE_CACHE_WC)
6c386655	94	#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL \| _PAGE_PCD \| _PAGE_PWT)
d546b67a	95	#define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL \| _PAGE_PCD)
6c386655 JF	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)
3a9e189d	99	#define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL \| _PAGE_CACHE_UC \| _PAGE_PSE)
6c386655 JF	100	#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC \| _PAGE_PSE)
6c386655 JF	101
be43d728 JF	102	#define __PAGE_KERNEL_IO (__PAGE_KERNEL \| _PAGE_IOMAP)
	103	#define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE \| _PAGE_IOMAP)
	104	#define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS \| _PAGE_IOMAP)
	105	#define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC \| _PAGE_IOMAP)
	106
8490638c JF	107	#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
	108	#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
	109	#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
	110	#define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
	111	#define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
	112	#define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
	113	#define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
	114	#define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
	115	#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
3a9e189d	116	#define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
8490638c JF	117	#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
	118	#define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
	119	#define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
6c386655	120
be43d728 JF	121	#define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
	122	#define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
	123	#define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
	124	#define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
	125
6c386655 JF	126	/* xwr */
	127	#define __P000 PAGE_NONE
	128	#define __P001 PAGE_READONLY
	129	#define __P010 PAGE_COPY
	130	#define __P011 PAGE_COPY
	131	#define __P100 PAGE_READONLY_EXEC
	132	#define __P101 PAGE_READONLY_EXEC
	133	#define __P110 PAGE_COPY_EXEC
	134	#define __P111 PAGE_COPY_EXEC
	135
	136	#define __S000 PAGE_NONE
	137	#define __S001 PAGE_READONLY
	138	#define __S010 PAGE_SHARED
	139	#define __S011 PAGE_SHARED
	140	#define __S100 PAGE_READONLY_EXEC
	141	#define __S101 PAGE_READONLY_EXEC
	142	#define __S110 PAGE_SHARED_EXEC
	143	#define __S111 PAGE_SHARED_EXEC
	144
b2bc2731 SS	145	/*
	146	* early identity mapping pte attrib macros.
	147	*/
	148	#ifdef CONFIG_X86_64
	149	#define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
	150	#else
3a85e770 SS	151	#define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
3a85e770 SS	152	#define PDE_IDENT_ATTR 0x063 /* PRESENT+RW+DIRTY+ACCESSED */
b2bc2731 SS	153	#define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
	154	#endif
	155
4614139c	156	#ifndef __ASSEMBLY__
195466dc	157
8405b122 JF	158	/*
	159	* ZERO_PAGE is a global shared page that is always zero: used
	160	* for zero-mapped memory areas etc..
	161	*/
3cbaeafe	162	extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
8405b122 JF	163	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
8405b122 JF	164
e3ed910d JF	165	extern spinlock_t pgd_lock;
e3ed910d JF	166	extern struct list_head pgd_list;
8405b122	167
4614139c JF	168	/*
	169	* The following only work if pte_present() is true.
	170	* Undefined behaviour if not..
	171	*/
3cbaeafe JP	172	static inline int pte_dirty(pte_t pte)
3cbaeafe JP	173	{
a15af1c9	174	return pte_flags(pte) & _PAGE_DIRTY;
3cbaeafe JP	175	}
	176
	177	static inline int pte_young(pte_t pte)
	178	{
a15af1c9	179	return pte_flags(pte) & _PAGE_ACCESSED;
3cbaeafe JP	180	}
	181
	182	static inline int pte_write(pte_t pte)
	183	{
a15af1c9	184	return pte_flags(pte) & _PAGE_RW;
3cbaeafe JP	185	}
	186
	187	static inline int pte_file(pte_t pte)
	188	{
a15af1c9	189	return pte_flags(pte) & _PAGE_FILE;
3cbaeafe JP	190	}
	191
	192	static inline int pte_huge(pte_t pte)
	193	{
a15af1c9	194	return pte_flags(pte) & _PAGE_PSE;
4614139c JF	195	}
4614139c JF	196
3cbaeafe JP	197	static inline int pte_global(pte_t pte)
3cbaeafe JP	198	{
a15af1c9	199	return pte_flags(pte) & _PAGE_GLOBAL;
3cbaeafe JP	200	}
	201
	202	static inline int pte_exec(pte_t pte)
	203	{
a15af1c9	204	return !(pte_flags(pte) & _PAGE_NX);
3cbaeafe JP	205	}
3cbaeafe JP	206
7e675137 NP	207	static inline int pte_special(pte_t pte)
7e675137 NP	208	{
606ee44d	209	return pte_flags(pte) & _PAGE_SPECIAL;
7e675137 NP	210	}
7e675137 NP	211
91030ca1 HD	212	static inline unsigned long pte_pfn(pte_t pte)
	213	{
	214	return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
	215	}
	216
	217	#define pte_page(pte) pfn_to_page(pte_pfn(pte))
	218
3cbaeafe JP	219	static inline int pmd_large(pmd_t pte)
	220	{
	221	return (pmd_val(pte) & (_PAGE_PSE \| _PAGE_PRESENT)) ==
	222	(_PAGE_PSE \| _PAGE_PRESENT);
	223	}
	224
	225	static inline pte_t pte_mkclean(pte_t pte)
	226	{
4226ab93	227	return __pte(pte_val(pte) & ~_PAGE_DIRTY);
3cbaeafe JP	228	}
	229
	230	static inline pte_t pte_mkold(pte_t pte)
	231	{
4226ab93	232	return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
3cbaeafe JP	233	}
	234
	235	static inline pte_t pte_wrprotect(pte_t pte)
	236	{
4226ab93	237	return __pte(pte_val(pte) & ~_PAGE_RW);
3cbaeafe JP	238	}
	239
	240	static inline pte_t pte_mkexec(pte_t pte)
	241	{
4226ab93	242	return __pte(pte_val(pte) & ~_PAGE_NX);
3cbaeafe JP	243	}
	244
	245	static inline pte_t pte_mkdirty(pte_t pte)
	246	{
	247	return __pte(pte_val(pte) \| _PAGE_DIRTY);
	248	}
	249
	250	static inline pte_t pte_mkyoung(pte_t pte)
	251	{
	252	return __pte(pte_val(pte) \| _PAGE_ACCESSED);
	253	}
	254
	255	static inline pte_t pte_mkwrite(pte_t pte)
	256	{
	257	return __pte(pte_val(pte) \| _PAGE_RW);
	258	}
	259
	260	static inline pte_t pte_mkhuge(pte_t pte)
	261	{
	262	return __pte(pte_val(pte) \| _PAGE_PSE);
	263	}
	264
	265	static inline pte_t pte_clrhuge(pte_t pte)
	266	{
4226ab93	267	return __pte(pte_val(pte) & ~_PAGE_PSE);
3cbaeafe JP	268	}
	269
	270	static inline pte_t pte_mkglobal(pte_t pte)
	271	{
	272	return __pte(pte_val(pte) \| _PAGE_GLOBAL);
	273	}
	274
	275	static inline pte_t pte_clrglobal(pte_t pte)
	276	{
4226ab93	277	return __pte(pte_val(pte) & ~_PAGE_GLOBAL);
3cbaeafe	278	}
4614139c	279
7e675137 NP	280	static inline pte_t pte_mkspecial(pte_t pte)
7e675137 NP	281	{
a0a8f536	282	return __pte(pte_val(pte) \| _PAGE_SPECIAL);
7e675137 NP	283	}
7e675137 NP	284
6fdc05d4 JF	285	extern pteval_t __supported_pte_mask;
	286
	287	static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
	288	{
	289	return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	290	pgprot_val(pgprot)) & __supported_pte_mask);
	291	}
	292
	293	static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
	294	{
	295	return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	296	pgprot_val(pgprot)) & __supported_pte_mask);
	297	}
	298
38472311 IM	299	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	300	{
	301	pteval_t val = pte_val(pte);
	302
	303	/*
	304	* Chop off the NX bit (if present), and add the NX portion of
	305	* the newprot (if present):
	306	*/
1c12c4cf VP	307	val &= _PAGE_CHG_MASK;
1c12c4cf VP	308	val \|= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
38472311 IM	309
	310	return __pte(val);
	311	}
	312
1c12c4cf VP	313	/* mprotect needs to preserve PAT bits when updating vm_page_prot */
	314	#define pgprot_modify pgprot_modify
	315	static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
	316	{
	317	pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
	318	pgprotval_t addbits = pgprot_val(newprot);
	319	return __pgprot(preservebits \| addbits);
	320	}
	321
77be1fab	322	#define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
c6ca18eb	323
1e8e23bc AK	324	#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
1e8e23bc AK	325
f0970c13	326	#ifndef __ASSEMBLY__
	327	#define __HAVE_PHYS_MEM_ACCESS_PROT
	328	struct file;
	329	pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
	330	unsigned long size, pgprot_t vma_prot);
	331	int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
	332	unsigned long size, pgprot_t *vma_prot);
	333	#endif
	334
d494a961 JF	335	/* Install a pte for a particular vaddr in kernel space. */
	336	void set_pte_vaddr(unsigned long vaddr, pte_t pte);
	337
a312b37b EH	338	#ifdef CONFIG_X86_32
	339	extern void native_pagetable_setup_start(pgd_t *base);
	340	extern void native_pagetable_setup_done(pgd_t *base);
	341	#else
	342	static inline void native_pagetable_setup_start(pgd_t *base) {}
	343	static inline void native_pagetable_setup_done(pgd_t *base) {}
	344	#endif
	345
e0b7c819 JS	346	extern int arch_report_meminfo(char *page);
e0b7c819 JS	347
4891645e JF	348	#ifdef CONFIG_PARAVIRT
	349	#include <asm/paravirt.h>
	350	#else /* !CONFIG_PARAVIRT */
	351	#define set_pte(ptep, pte) native_set_pte(ptep, pte)
	352	#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
	353
	354	#define set_pte_present(mm, addr, ptep, pte) \
	355	native_set_pte_present(mm, addr, ptep, pte)
	356	#define set_pte_atomic(ptep, pte) \
	357	native_set_pte_atomic(ptep, pte)
	358
	359	#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
	360
	361	#ifndef __PAGETABLE_PUD_FOLDED
	362	#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
	363	#define pgd_clear(pgd) native_pgd_clear(pgd)
	364	#endif
	365
	366	#ifndef set_pud
	367	# define set_pud(pudp, pud) native_set_pud(pudp, pud)
	368	#endif
	369
	370	#ifndef __PAGETABLE_PMD_FOLDED
	371	#define pud_clear(pud) native_pud_clear(pud)
	372	#endif
	373
	374	#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
	375	#define pmd_clear(pmd) native_pmd_clear(pmd)
	376
	377	#define pte_update(mm, addr, ptep) do { } while (0)
	378	#define pte_update_defer(mm, addr, ptep) do { } while (0)
a312b37b EH	379
	380	static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
	381	{
	382	native_pagetable_setup_start(base);
	383	}
	384
	385	static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
	386	{
	387	native_pagetable_setup_done(base);
	388	}
4891645e JF	389	#endif /* CONFIG_PARAVIRT */
4891645e JF	390
4614139c JF	391	#endif /* __ASSEMBLY__ */
4614139c JF	392
96a388de TG	393	#ifdef CONFIG_X86_32
	394	# include "pgtable_32.h"
	395	#else
	396	# include "pgtable_64.h"
	397	#endif
6c386655	398
fb15a9b3 JF	399	/*
	400	* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
	401	*
	402	* this macro returns the index of the entry in the pgd page which would
	403	* control the given virtual address
	404	*/
	405	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
	406
	407	/*
	408	* pgd_offset() returns a (pgd_t *)
	409	* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
	410	*/
	411	#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
	412	/*
	413	* a shortcut which implies the use of the kernel's pgd, instead
	414	* of a process's
	415	*/
	416	#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
	417
	418
68db065c JF	419	#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
	420	#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
	421
195466dc JF	422	#ifndef __ASSEMBLY__
195466dc JF	423
30551bb3 TG	424	enum {
	425	PG_LEVEL_NONE,
	426	PG_LEVEL_4K,
	427	PG_LEVEL_2M,
86f03989	428	PG_LEVEL_1G,
ce0c0e50	429	PG_LEVEL_NUM
30551bb3 TG	430	};
30551bb3 TG	431
65280e61 TG	432	#ifdef CONFIG_PROC_FS
	433	extern void update_page_count(int level, unsigned long pages);
	434	#else
	435	static inline void update_page_count(int level, unsigned long pages) { }
	436	#endif
ce0c0e50	437
0a663088 TG	438	/*
	439	* Helper function that returns the kernel pagetable entry controlling
	440	* the virtual address 'address'. NULL means no pagetable entry present.
	441	* NOTE: the return type is pte_t but if the pmd is PSE then we return it
	442	* as a pte too.
	443	*/
da7bfc50	444	extern pte_t lookup_address(unsigned long address, unsigned int level);
0a663088	445
4891645e JF	446	/* local pte updates need not use xchg for locking */
	447	static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
	448	{
	449	pte_t res = *ptep;
	450
	451	/* Pure native function needs no input for mm, addr */
	452	native_pte_clear(NULL, 0, ptep);
	453	return res;
	454	}
	455
	456	static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
	457	pte_t *ptep , pte_t pte)
	458	{
	459	native_set_pte(ptep, pte);
	460	}
	461
195466dc JF	462	#ifndef CONFIG_PARAVIRT
	463	/*
	464	* Rules for using pte_update - it must be called after any PTE update which
	465	* has not been done using the set_pte / clear_pte interfaces. It is used by
	466	* shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
	467	* updates should either be sets, clears, or set_pte_atomic for P->P
	468	* transitions, which means this hook should only be called for user PTEs.
	469	* This hook implies a P->P protection or access change has taken place, which
	470	* requires a subsequent TLB flush. The notification can optionally be delayed
	471	* until the TLB flush event by using the pte_update_defer form of the
	472	* interface, but care must be taken to assure that the flush happens while
	473	* still holding the same page table lock so that the shadow and primary pages
	474	* do not become out of sync on SMP.
	475	*/
	476	#define pte_update(mm, addr, ptep) do { } while (0)
	477	#define pte_update_defer(mm, addr, ptep) do { } while (0)
	478	#endif
	479
195466dc JF	480	/*
	481	* We only update the dirty/accessed state if we set
	482	* the dirty bit by hand in the kernel, since the hardware
	483	* will do the accessed bit for us, and we don't want to
	484	* race with other CPU's that might be updating the dirty
	485	* bit at the same time.
	486	*/
bea41808 JF	487	struct vm_area_struct;
bea41808 JF	488
195466dc	489	#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
ee5aa8d3 JF	490	extern int ptep_set_access_flags(struct vm_area_struct *vma,
	491	unsigned long address, pte_t *ptep,
	492	pte_t entry, int dirty);
195466dc JF	493
195466dc JF	494	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
f9fbf1a3 JF	495	extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
f9fbf1a3 JF	496	unsigned long addr, pte_t *ptep);
195466dc JF	497
195466dc JF	498	#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
c20311e1 JF	499	extern int ptep_clear_flush_young(struct vm_area_struct *vma,
c20311e1 JF	500	unsigned long address, pte_t *ptep);
195466dc JF	501
195466dc JF	502	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
3cbaeafe JP	503	static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
3cbaeafe JP	504	pte_t *ptep)
195466dc JF	505	{
	506	pte_t pte = native_ptep_get_and_clear(ptep);
	507	pte_update(mm, addr, ptep);
	508	return pte;
	509	}
	510
	511	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
3cbaeafe JP	512	static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
	513	unsigned long addr, pte_t *ptep,
	514	int full)
195466dc JF	515	{
	516	pte_t pte;
	517	if (full) {
	518	/*
	519	* Full address destruction in progress; paravirt does not
	520	* care about updates and native needs no locking
	521	*/
	522	pte = native_local_ptep_get_and_clear(ptep);
	523	} else {
	524	pte = ptep_get_and_clear(mm, addr, ptep);
	525	}
	526	return pte;
	527	}
	528
	529	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
3cbaeafe JP	530	static inline void ptep_set_wrprotect(struct mm_struct *mm,
3cbaeafe JP	531	unsigned long addr, pte_t *ptep)
195466dc	532	{
d8d89827	533	clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
195466dc JF	534	pte_update(mm, addr, ptep);
	535	}
	536
85958b46 JF	537	/*
	538	* clone_pgd_range(pgd_t dst, pgd_t src, int count);
	539	*
	540	* dst - pointer to pgd range anwhere on a pgd page
	541	* src - ""
	542	* count - the number of pgds to copy.
	543	*
	544	* dst and src can be on the same page, but the range must not overlap,
	545	* and must not cross a page boundary.
	546	*/
	547	static inline void clone_pgd_range(pgd_t dst, pgd_t src, int count)
	548	{
	549	memcpy(dst, src, count * sizeof(pgd_t));
	550	}
	551
	552
195466dc JF	553	#include <asm-generic/pgtable.h>
	554	#endif /* __ASSEMBLY__ */
	555
77ef50a5	556	#endif /* ASM_X86__PGTABLE_H */