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

#ifndef _ASM_X86_PGTABLE_H
#define _ASM_X86_PGTABLE_H

#define USER_PTRS_PER_PGD	((TASK_SIZE-1)/PGDIR_SIZE+1)
#define FIRST_USER_ADDRESS	0

#define _PAGE_BIT_PRESENT	0
#define _PAGE_BIT_RW		1
#define _PAGE_BIT_USER		2
#define _PAGE_BIT_PWT		3
#define _PAGE_BIT_PCD		4
#define _PAGE_BIT_ACCESSED	5
#define _PAGE_BIT_DIRTY		6
#define _PAGE_BIT_FILE		6
#define _PAGE_BIT_PSE		7	/* 4 MB (or 2MB) page */
#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_NX           63       /* No execute: only valid after cpuid check */

#define _PAGE_PRESENT	(_AC(1, L)<<_PAGE_BIT_PRESENT)
#define _PAGE_RW	(_AC(1, L)<<_PAGE_BIT_RW)
#define _PAGE_USER	(_AC(1, L)<<_PAGE_BIT_USER)
#define _PAGE_PWT	(_AC(1, L)<<_PAGE_BIT_PWT)
#define _PAGE_PCD	(_AC(1, L)<<_PAGE_BIT_PCD)
#define _PAGE_ACCESSED	(_AC(1, L)<<_PAGE_BIT_ACCESSED)
#define _PAGE_DIRTY	(_AC(1, L)<<_PAGE_BIT_DIRTY)
#define _PAGE_PSE	(_AC(1, L)<<_PAGE_BIT_PSE)	/* 2MB page */
#define _PAGE_GLOBAL	(_AC(1, L)<<_PAGE_BIT_GLOBAL)	/* Global TLB entry */
#define _PAGE_UNUSED1	(_AC(1, L)<<_PAGE_BIT_UNUSED1)
#define _PAGE_UNUSED2	(_AC(1, L)<<_PAGE_BIT_UNUSED2)
#define _PAGE_UNUSED3	(_AC(1, L)<<_PAGE_BIT_UNUSED3)

#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
#define _PAGE_NX	(_AC(1, ULL) << _PAGE_BIT_NX)
#else
#define _PAGE_NX	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)

#define _PAGE_CHG_MASK	(PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)

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

#ifdef CONFIG_X86_32
#define _PAGE_KERNEL_EXEC \
	(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
#define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX)

#ifndef __ASSEMBLY__
extern unsigned long long __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
#endif	/* __ASSEMBLY__ */
#else
#define __PAGE_KERNEL_EXEC						\
	(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
#define __PAGE_KERNEL		(__PAGE_KERNEL_EXEC | _PAGE_NX)
#endif

#define __PAGE_KERNEL_RO		(__PAGE_KERNEL & ~_PAGE_RW)
#define __PAGE_KERNEL_RX		(__PAGE_KERNEL_EXEC & ~_PAGE_RW)
#define __PAGE_KERNEL_NOCACHE		(__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
#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_EXEC	(__PAGE_KERNEL_EXEC | _PAGE_PSE)

#ifdef CONFIG_X86_32
# define MAKE_GLOBAL(x)			__pgprot((x))
#else
# define MAKE_GLOBAL(x)			__pgprot((x) | _PAGE_GLOBAL)
#endif

#define PAGE_KERNEL			MAKE_GLOBAL(__PAGE_KERNEL)
#define PAGE_KERNEL_RO			MAKE_GLOBAL(__PAGE_KERNEL_RO)
#define PAGE_KERNEL_EXEC		MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
#define PAGE_KERNEL_RX			MAKE_GLOBAL(__PAGE_KERNEL_RX)
#define PAGE_KERNEL_NOCACHE		MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
#define PAGE_KERNEL_LARGE		MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
#define PAGE_KERNEL_LARGE_EXEC		MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
#define PAGE_KERNEL_VSYSCALL		MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
#define PAGE_KERNEL_VSYSCALL_NOCACHE	MAKE_GLOBAL(__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))


/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_write(pte_t pte)		{ return pte_val(pte) & _PAGE_RW; }
static inline int pte_file(pte_t pte)		{ return pte_val(pte) & _PAGE_FILE; }
static inline int pte_huge(pte_t pte)		{ return pte_val(pte) & _PAGE_PSE; }

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); }

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 & ~_PAGE_NX;
	val |= pgprot_val(newprot) & __supported_pte_mask;

	return __pte(val);
}

#endif	/* __ASSEMBLY__ */

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

#ifndef __ASSEMBLY__

#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

/* 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;
}

/*
 * 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.
 */
#define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
#define ptep_set_access_flags(vma, address, ptep, entry, dirty)		\
({									\
	int __changed = !pte_same(*(ptep), entry);			\
	if (__changed && dirty) {					\
		*ptep = entry;						\
		pte_update_defer((vma)->vm_mm, (address), (ptep));	\
		flush_tlb_page(vma, address);				\
	}								\
	__changed;							\
})

#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define ptep_test_and_clear_young(vma, addr, ptep) ({			\
	int __ret = 0;							\
	if (pte_young(*(ptep)))						\
		__ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,		\
					   &(ptep)->pte);		\
	if (__ret)							\
		pte_update((vma)->vm_mm, addr, ptep);			\
	__ret;								\
})

#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
#define ptep_clear_flush_young(vma, address, ptep)			\
({									\
	int __young;							\
	__young = ptep_test_and_clear_young((vma), (address), (ptep));	\
	if (__young)							\
		flush_tlb_page(vma, address);				\
	__young;							\
})

#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);
}

#ifndef CONFIG_PARAVIRT
#define pte_clear(mm, addr, ptep)		native_pte_clear(mm, addr, ptep)
#endif	/* !CONFIG_PARAVIRT */

#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
	4	#define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1)
	5	#define FIRST_USER_ADDRESS 0
	6
	7	#define _PAGE_BIT_PRESENT 0
	8	#define _PAGE_BIT_RW 1
	9	#define _PAGE_BIT_USER 2
	10	#define _PAGE_BIT_PWT 3
	11	#define _PAGE_BIT_PCD 4
	12	#define _PAGE_BIT_ACCESSED 5
	13	#define _PAGE_BIT_DIRTY 6
	14	#define _PAGE_BIT_FILE 6
	15	#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
	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_NX 63 /* No execute: only valid after cpuid check */
	21
61f38226 IM	22	#define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT)
	23	#define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW)
	24	#define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER)
	25	#define _PAGE_PWT (_AC(1, L)<<_PAGE_BIT_PWT)
	26	#define _PAGE_PCD (_AC(1, L)<<_PAGE_BIT_PCD)
	27	#define _PAGE_ACCESSED (_AC(1, L)<<_PAGE_BIT_ACCESSED)
	28	#define _PAGE_DIRTY (_AC(1, L)<<_PAGE_BIT_DIRTY)
	29	#define _PAGE_PSE (_AC(1, L)<<_PAGE_BIT_PSE) /* 2MB page */
	30	#define _PAGE_GLOBAL (_AC(1, L)<<_PAGE_BIT_GLOBAL) /* Global TLB entry */
	31	#define _PAGE_UNUSED1 (_AC(1, L)<<_PAGE_BIT_UNUSED1)
	32	#define _PAGE_UNUSED2 (_AC(1, L)<<_PAGE_BIT_UNUSED2)
	33	#define _PAGE_UNUSED3 (_AC(1, L)<<_PAGE_BIT_UNUSED3)
6c386655 JF	34
	35	#if defined(CONFIG_X86_64) \|\| defined(CONFIG_X86_PAE)
	36	#define _PAGE_NX (_AC(1, ULL) << _PAGE_BIT_NX)
	37	#else
	38	#define _PAGE_NX 0
	39	#endif
	40
	41	/* If _PAGE_PRESENT is clear, we use these: */
	42	#define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping, saved PTE; unset:swap */
	43	#define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
	44	pte_present gives true */
	45
	46	#define _PAGE_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	47	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	48
	49	#define _PAGE_CHG_MASK (PTE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	50
	51	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
	52	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_NX)
	53
	54	#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED)
	55	#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_NX)
	56	#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	57	#define PAGE_COPY PAGE_COPY_NOEXEC
	58	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_NX)
	59	#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	60
	61	#ifdef CONFIG_X86_32
	62	#define _PAGE_KERNEL_EXEC \
	63	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED)
	64	#define _PAGE_KERNEL (_PAGE_KERNEL_EXEC \| _PAGE_NX)
	65
	66	#ifndef __ASSEMBLY__
	67	extern unsigned long long __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
	68	#endif /* __ASSEMBLY__ */
	69	#else
	70	#define __PAGE_KERNEL_EXEC \
	71	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED)
	72	#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC \| _PAGE_NX)
	73	#endif
	74
	75	#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
	76	#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
	77	#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL \| _PAGE_PCD \| _PAGE_PWT)
	78	#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX \| _PAGE_USER)
	79	#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL \| _PAGE_PCD \| _PAGE_PWT)
	80	#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL \| _PAGE_PSE)
	81	#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC \| _PAGE_PSE)
	82
	83	#ifdef CONFIG_X86_32
	84	# define MAKE_GLOBAL(x) __pgprot((x))
	85	#else
	86	# define MAKE_GLOBAL(x) __pgprot((x) \| _PAGE_GLOBAL)
	87	#endif
	88
	89	#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
	90	#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
	91	#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
	92	#define PAGE_KERNEL_RX MAKE_GLOBAL(__PAGE_KERNEL_RX)
	93	#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
	94	#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
	95	#define PAGE_KERNEL_LARGE_EXEC MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
	96	#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
	97	#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
98
99	/* xwr */
100	#define __P000 PAGE_NONE
101	#define __P001 PAGE_READONLY
102	#define __P010 PAGE_COPY
103	#define __P011 PAGE_COPY
104	#define __P100 PAGE_READONLY_EXEC
105	#define __P101 PAGE_READONLY_EXEC
106	#define __P110 PAGE_COPY_EXEC
107	#define __P111 PAGE_COPY_EXEC
108
109	#define __S000 PAGE_NONE
110	#define __S001 PAGE_READONLY
111	#define __S010 PAGE_SHARED
112	#define __S011 PAGE_SHARED
113	#define __S100 PAGE_READONLY_EXEC
114	#define __S101 PAGE_READONLY_EXEC
115	#define __S110 PAGE_SHARED_EXEC
116	#define __S111 PAGE_SHARED_EXEC
117
4614139c	118	#ifndef __ASSEMBLY__
195466dc	119
8405b122 JF	120	/*
	121	* ZERO_PAGE is a global shared page that is always zero: used
	122	* for zero-mapped memory areas etc..
	123	*/
	124	extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
	125	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
	126
	127
4614139c JF	128	/*
	129	* The following only work if pte_present() is true.
	130	* Undefined behaviour if not..
	131	*/
	132	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
	133	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
	134	static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
	135	static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
	136	static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_PSE; }
	137
	138	static inline int pmd_large(pmd_t pte) {
	139	return (pmd_val(pte) & (_PAGE_PSE\|_PAGE_PRESENT)) ==
	140	(_PAGE_PSE\|_PAGE_PRESENT);
	141	}
	142
	143	static inline pte_t pte_mkclean(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_DIRTY); }
	144	static inline pte_t pte_mkold(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_ACCESSED); }
	145	static inline pte_t pte_wrprotect(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_RW); }
	146	static inline pte_t pte_mkexec(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_NX); }
	147	static inline pte_t pte_mkdirty(pte_t pte) { return __pte(pte_val(pte) \| _PAGE_DIRTY); }
	148	static inline pte_t pte_mkyoung(pte_t pte) { return __pte(pte_val(pte) \| _PAGE_ACCESSED); }
	149	static inline pte_t pte_mkwrite(pte_t pte) { return __pte(pte_val(pte) \| _PAGE_RW); }
	150	static inline pte_t pte_mkhuge(pte_t pte) { return __pte(pte_val(pte) \| _PAGE_PSE); }
	151	static inline pte_t pte_clrhuge(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_PSE); }
	152
6fdc05d4 JF	153	extern pteval_t __supported_pte_mask;
	154
	155	static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
	156	{
	157	return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	158	pgprot_val(pgprot)) & __supported_pte_mask);
	159	}
	160
	161	static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
	162	{
	163	return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	164	pgprot_val(pgprot)) & __supported_pte_mask);
	165	}
	166
38472311 IM	167	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	168	{
	169	pteval_t val = pte_val(pte);
	170
	171	/*
	172	* Chop off the NX bit (if present), and add the NX portion of
	173	* the newprot (if present):
	174	*/
	175	val &= _PAGE_CHG_MASK & ~_PAGE_NX;
	176	val \|= pgprot_val(newprot) & __supported_pte_mask;
	177
	178	return __pte(val);
	179	}
	180
4614139c JF	181	#endif /* __ASSEMBLY__ */
4614139c JF	182
96a388de TG	183	#ifdef CONFIG_X86_32
	184	# include "pgtable_32.h"
	185	#else
	186	# include "pgtable_64.h"
	187	#endif
6c386655	188
195466dc JF	189	#ifndef __ASSEMBLY__
	190
	191	#ifndef CONFIG_PARAVIRT
	192	/*
	193	* Rules for using pte_update - it must be called after any PTE update which
	194	* has not been done using the set_pte / clear_pte interfaces. It is used by
	195	* shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
	196	* updates should either be sets, clears, or set_pte_atomic for P->P
	197	* transitions, which means this hook should only be called for user PTEs.
	198	* This hook implies a P->P protection or access change has taken place, which
	199	* requires a subsequent TLB flush. The notification can optionally be delayed
	200	* until the TLB flush event by using the pte_update_defer form of the
	201	* interface, but care must be taken to assure that the flush happens while
	202	* still holding the same page table lock so that the shadow and primary pages
	203	* do not become out of sync on SMP.
	204	*/
	205	#define pte_update(mm, addr, ptep) do { } while (0)
	206	#define pte_update_defer(mm, addr, ptep) do { } while (0)
	207	#endif
	208
	209	/* local pte updates need not use xchg for locking */
	210	static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
	211	{
	212	pte_t res = *ptep;
	213
	214	/* Pure native function needs no input for mm, addr */
	215	native_pte_clear(NULL, 0, ptep);
	216	return res;
	217	}
	218
	219	/*
	220	* We only update the dirty/accessed state if we set
	221	* the dirty bit by hand in the kernel, since the hardware
	222	* will do the accessed bit for us, and we don't want to
	223	* race with other CPU's that might be updating the dirty
	224	* bit at the same time.
	225	*/
	226	#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
	227	#define ptep_set_access_flags(vma, address, ptep, entry, dirty) \
	228	({ \
	229	int __changed = !pte_same(*(ptep), entry); \
	230	if (__changed && dirty) { \
	231	*ptep = entry; \
	232	pte_update_defer((vma)->vm_mm, (address), (ptep)); \
	233	flush_tlb_page(vma, address); \
	234	} \
	235	__changed; \
	236	})
	237
	238	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
	239	#define ptep_test_and_clear_young(vma, addr, ptep) ({ \
	240	int __ret = 0; \
	241	if (pte_young(*(ptep))) \
	242	__ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, \
	243	&(ptep)->pte); \
	244	if (__ret) \
	245	pte_update((vma)->vm_mm, addr, ptep); \
	246	__ret; \
	247	})
	248
	249	#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
	250	#define ptep_clear_flush_young(vma, address, ptep) \
	251	({ \
	252	int __young; \
253	__young = ptep_test_and_clear_young((vma), (address), (ptep)); \
254	if (__young) \
255	flush_tlb_page(vma, address); \
256	__young; \
257	})
258
259	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
260	static inline pte_t ptep_get_and_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
261	{
262	pte_t pte = native_ptep_get_and_clear(ptep);
263	pte_update(mm, addr, ptep);
264	return pte;
265	}
266
267	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
268	static inline pte_t ptep_get_and_clear_full(struct mm_struct mm, unsigned long addr, pte_t ptep, int full)
269	{
270	pte_t pte;
271	if (full) {
272	/*
273	* Full address destruction in progress; paravirt does not
274	* care about updates and native needs no locking
275	*/
276	pte = native_local_ptep_get_and_clear(ptep);
277	} else {
278	pte = ptep_get_and_clear(mm, addr, ptep);
279	}
280	return pte;
281	}
282
283	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
284	static inline void ptep_set_wrprotect(struct mm_struct mm, unsigned long addr, pte_t ptep)
285	{
d8d89827	286	clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
195466dc JF	287	pte_update(mm, addr, ptep);
	288	}
	289
	290	#ifndef CONFIG_PARAVIRT
	291	#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
	292	#endif /* !CONFIG_PARAVIRT */
	293
	294	#include <asm-generic/pgtable.h>
	295	#endif /* __ASSEMBLY__ */
	296
6c386655	297	#endif /* _ASM_X86_PGTABLE_H */