[linux-2.6-block.git] / arch / x86 / include / asm / pgtable_types.h

#ifndef _ASM_X86_PGTABLE_DEFS_H
#define _ASM_X86_PGTABLE_DEFS_H

#include <linux/const.h>
#include <asm/page_types.h>

#define FIRST_USER_ADDRESS	0UL

#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_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_SOFTW1	9	/* available for programmer */
#define _PAGE_BIT_SOFTW2	10	/* " */
#define _PAGE_BIT_SOFTW3	11	/* " */
#define _PAGE_BIT_PAT_LARGE	12	/* On 2MB or 1GB pages */
#define _PAGE_BIT_SOFTW4	58	/* available for programmer */
#define _PAGE_BIT_PKEY_BIT0	59	/* Protection Keys, bit 1/4 */
#define _PAGE_BIT_PKEY_BIT1	60	/* Protection Keys, bit 2/4 */
#define _PAGE_BIT_PKEY_BIT2	61	/* Protection Keys, bit 3/4 */
#define _PAGE_BIT_PKEY_BIT3	62	/* Protection Keys, bit 4/4 */
#define _PAGE_BIT_NX		63	/* No execute: only valid after cpuid check */

#define _PAGE_BIT_SPECIAL	_PAGE_BIT_SOFTW1
#define _PAGE_BIT_CPA_TEST	_PAGE_BIT_SOFTW1
#define _PAGE_BIT_HIDDEN	_PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
#define _PAGE_BIT_SOFT_DIRTY	_PAGE_BIT_SOFTW3 /* software dirty tracking */
#define _PAGE_BIT_DEVMAP	_PAGE_BIT_SOFTW4

/* If _PAGE_BIT_PRESENT is clear, we use these: */
/* - if the user mapped it with PROT_NONE; pte_present gives true */
#define _PAGE_BIT_PROTNONE	_PAGE_BIT_GLOBAL

#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_SOFTW1	(_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
#define _PAGE_SOFTW2	(_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
#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)
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
#define _PAGE_PKEY_BIT0	(_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT0)
#define _PAGE_PKEY_BIT1	(_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT1)
#define _PAGE_PKEY_BIT2	(_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT2)
#define _PAGE_PKEY_BIT3	(_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT3)
#else
#define _PAGE_PKEY_BIT0	(_AT(pteval_t, 0))
#define _PAGE_PKEY_BIT1	(_AT(pteval_t, 0))
#define _PAGE_PKEY_BIT2	(_AT(pteval_t, 0))
#define _PAGE_PKEY_BIT3	(_AT(pteval_t, 0))
#endif
#define __HAVE_ARCH_PTE_SPECIAL

#define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
			 _PAGE_PKEY_BIT1 | \
			 _PAGE_PKEY_BIT2 | \
			 _PAGE_PKEY_BIT3)

#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
#define _PAGE_KNL_ERRATUM_MASK (_PAGE_DIRTY | _PAGE_ACCESSED)
#else
#define _PAGE_KNL_ERRATUM_MASK 0
#endif

#ifdef CONFIG_KMEMCHECK
#define _PAGE_HIDDEN	(_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
#else
#define _PAGE_HIDDEN	(_AT(pteval_t, 0))
#endif

/*
 * The same hidden bit is used by kmemcheck, but since kmemcheck
 * works on kernel pages while soft-dirty engine on user space,
 * they do not conflict with each other.
 */

#ifdef CONFIG_MEM_SOFT_DIRTY
#define _PAGE_SOFT_DIRTY	(_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
#else
#define _PAGE_SOFT_DIRTY	(_AT(pteval_t, 0))
#endif

/*
 * Tracking soft dirty bit when a page goes to a swap is tricky.
 * We need a bit which can be stored in pte _and_ not conflict
 * with swap entry format. On x86 bits 6 and 7 are *not* involved
 * into swap entry computation, but bit 6 is used for nonlinear
 * file mapping, so we borrow bit 7 for soft dirty tracking.
 *
 * Please note that this bit must be treated as swap dirty page
 * mark if and only if the PTE has present bit clear!
 */
#ifdef CONFIG_MEM_SOFT_DIRTY
#define _PAGE_SWP_SOFT_DIRTY	_PAGE_PSE
#else
#define _PAGE_SWP_SOFT_DIRTY	(_AT(pteval_t, 0))
#endif

#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
#define _PAGE_NX	(_AT(pteval_t, 1) << _PAGE_BIT_NX)
#define _PAGE_DEVMAP	(_AT(u64, 1) << _PAGE_BIT_DEVMAP)
#define __HAVE_ARCH_PTE_DEVMAP
#else
#define _PAGE_NX	(_AT(pteval_t, 0))
#define _PAGE_DEVMAP	(_AT(pteval_t, 0))
#endif

#define _PAGE_PROTNONE	(_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)

#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.  The pte's
 * protection key is treated like _PAGE_RW, for
 * instance, and is *not* included in this mask since
 * pte_modify() does modify it.
 */
#define _PAGE_CHG_MASK	(PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |		\
			 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY |	\
			 _PAGE_SOFT_DIRTY)
#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)

/*
 * The cache modes defined here are used to translate between pure SW usage
 * and the HW defined cache mode bits and/or PAT entries.
 *
 * The resulting bits for PWT, PCD and PAT should be chosen in a way
 * to have the WB mode at index 0 (all bits clear). This is the default
 * right now and likely would break too much if changed.
 */
#ifndef __ASSEMBLY__
enum page_cache_mode {
	_PAGE_CACHE_MODE_WB = 0,
	_PAGE_CACHE_MODE_WC = 1,
	_PAGE_CACHE_MODE_UC_MINUS = 2,
	_PAGE_CACHE_MODE_UC = 3,
	_PAGE_CACHE_MODE_WT = 4,
	_PAGE_CACHE_MODE_WP = 5,
	_PAGE_CACHE_MODE_NUM = 8
};
#endif

#define _PAGE_CACHE_MASK	(_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)
#define _PAGE_NOCACHE		(cachemode2protval(_PAGE_CACHE_MODE_UC))

#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_NOCACHE		(__PAGE_KERNEL | _PAGE_NOCACHE)
#define __PAGE_KERNEL_VSYSCALL		(__PAGE_KERNEL_RX | _PAGE_USER)
#define __PAGE_KERNEL_VVAR		(__PAGE_KERNEL_RO | _PAGE_USER)
#define __PAGE_KERNEL_LARGE		(__PAGE_KERNEL | _PAGE_PSE)
#define __PAGE_KERNEL_LARGE_EXEC	(__PAGE_KERNEL_EXEC | _PAGE_PSE)

#define __PAGE_KERNEL_IO		(__PAGE_KERNEL)
#define __PAGE_KERNEL_IO_NOCACHE	(__PAGE_KERNEL_NOCACHE)

#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_NOCACHE		__pgprot(__PAGE_KERNEL_NOCACHE)
#define PAGE_KERNEL_LARGE		__pgprot(__PAGE_KERNEL_LARGE)
#define PAGE_KERNEL_LARGE_EXEC		__pgprot(__PAGE_KERNEL_LARGE_EXEC)
#define PAGE_KERNEL_VSYSCALL		__pgprot(__PAGE_KERNEL_VSYSCALL)
#define PAGE_KERNEL_VVAR		__pgprot(__PAGE_KERNEL_VVAR)

#define PAGE_KERNEL_IO			__pgprot(__PAGE_KERNEL_IO)
#define PAGE_KERNEL_IO_NOCACHE		__pgprot(__PAGE_KERNEL_IO_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	 0x003		/* PRESENT+RW */
#define PDE_IDENT_ATTR	 0x063		/* PRESENT+RW+DIRTY+ACCESSED */
#define PGD_IDENT_ATTR	 0x001		/* PRESENT (no other attributes) */
#endif

#ifdef CONFIG_X86_32
# include <asm/pgtable_32_types.h>
#else
# include <asm/pgtable_64_types.h>
#endif

#ifndef __ASSEMBLY__

#include <linux/types.h>

/* Extracts the PFN from a (pte|pmd|pud|pgd)val_t of a 4KB page */
#define PTE_PFN_MASK		((pteval_t)PHYSICAL_PAGE_MASK)

/*
 *  Extracts the flags from a (pte|pmd|pud|pgd)val_t
 *  This includes the protection key value.
 */
#define PTE_FLAGS_MASK		(~PTE_PFN_MASK)

typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;

typedef struct { pgdval_t pgd; } pgd_t;

static inline pgd_t native_make_pgd(pgdval_t val)
{
	return (pgd_t) { val };
}

static inline pgdval_t native_pgd_val(pgd_t pgd)
{
	return pgd.pgd;
}

static inline pgdval_t pgd_flags(pgd_t pgd)
{
	return native_pgd_val(pgd) & PTE_FLAGS_MASK;
}

#if CONFIG_PGTABLE_LEVELS > 3
typedef struct { pudval_t pud; } pud_t;

static inline pud_t native_make_pud(pmdval_t val)
{
	return (pud_t) { val };
}

static inline pudval_t native_pud_val(pud_t pud)
{
	return pud.pud;
}
#else
#include <asm-generic/pgtable-nopud.h>

static inline pudval_t native_pud_val(pud_t pud)
{
	return native_pgd_val(pud.pgd);
}
#endif

#if CONFIG_PGTABLE_LEVELS > 2
typedef struct { pmdval_t pmd; } pmd_t;

static inline pmd_t native_make_pmd(pmdval_t val)
{
	return (pmd_t) { val };
}

static inline pmdval_t native_pmd_val(pmd_t pmd)
{
	return pmd.pmd;
}
#else
#include <asm-generic/pgtable-nopmd.h>

static inline pmdval_t native_pmd_val(pmd_t pmd)
{
	return native_pgd_val(pmd.pud.pgd);
}
#endif

static inline pudval_t pud_pfn_mask(pud_t pud)
{
	if (native_pud_val(pud) & _PAGE_PSE)
		return PHYSICAL_PUD_PAGE_MASK;
	else
		return PTE_PFN_MASK;
}

static inline pudval_t pud_flags_mask(pud_t pud)
{
	return ~pud_pfn_mask(pud);
}

static inline pudval_t pud_flags(pud_t pud)
{
	return native_pud_val(pud) & pud_flags_mask(pud);
}

static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
{
	if (native_pmd_val(pmd) & _PAGE_PSE)
		return PHYSICAL_PMD_PAGE_MASK;
	else
		return PTE_PFN_MASK;
}

static inline pmdval_t pmd_flags_mask(pmd_t pmd)
{
	return ~pmd_pfn_mask(pmd);
}

static inline pmdval_t pmd_flags(pmd_t pmd)
{
	return native_pmd_val(pmd) & pmd_flags_mask(pmd);
}

static inline pte_t native_make_pte(pteval_t val)
{
	return (pte_t) { .pte = val };
}

static inline pteval_t native_pte_val(pte_t pte)
{
	return pte.pte;
}

static inline pteval_t pte_flags(pte_t pte)
{
	return native_pte_val(pte) & PTE_FLAGS_MASK;
}

#define pgprot_val(x)	((x).pgprot)
#define __pgprot(x)	((pgprot_t) { (x) } )

extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
extern uint8_t __pte2cachemode_tbl[8];

#define __pte2cm_idx(cb)				\
	((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) |		\
	 (((cb) >> (_PAGE_BIT_PCD - 1)) & 2) |		\
	 (((cb) >> _PAGE_BIT_PWT) & 1))
#define __cm_idx2pte(i)					\
	((((i) & 4) << (_PAGE_BIT_PAT - 2)) |		\
	 (((i) & 2) << (_PAGE_BIT_PCD - 1)) |		\
	 (((i) & 1) << _PAGE_BIT_PWT))

static inline unsigned long cachemode2protval(enum page_cache_mode pcm)
{
	if (likely(pcm == 0))
		return 0;
	return __cachemode2pte_tbl[pcm];
}
static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
{
	return __pgprot(cachemode2protval(pcm));
}
static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
{
	unsigned long masked;

	masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
	if (likely(masked == 0))
		return 0;
	return __pte2cachemode_tbl[__pte2cm_idx(masked)];
}
static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
{
	pgprotval_t val = pgprot_val(pgprot);
	pgprot_t new;

	pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
		((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
	return new;
}
static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
{
	pgprotval_t val = pgprot_val(pgprot);
	pgprot_t new;

	pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
			  ((val & _PAGE_PAT_LARGE) >>
			   (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
	return new;
}


typedef struct page *pgtable_t;

extern pteval_t __supported_pte_mask;
extern void set_nx(void);
extern int nx_enabled;

#define pgprot_writecombine	pgprot_writecombine
extern pgprot_t pgprot_writecombine(pgprot_t prot);

#define pgprot_writethrough	pgprot_writethrough
extern pgprot_t pgprot_writethrough(pgprot_t prot);

/* Indicate that x86 has its own track and untrack pfn vma functions */
#define __HAVE_PFNMAP_TRACKING

#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);

/* 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_init(void);
#else
#define native_pagetable_init        paging_init
#endif

struct seq_file;
extern void arch_report_meminfo(struct seq_file *m);

enum pg_level {
	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);
extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
				    unsigned int *level);
extern pmd_t *lookup_pmd_address(unsigned long address);
extern phys_addr_t slow_virt_to_phys(void *__address);
extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
				   unsigned numpages, unsigned long page_flags);
#endif	/* !__ASSEMBLY__ */

#endif /* _ASM_X86_PGTABLE_DEFS_H */
Commit	Line	Data
8d19c99f JF	1	#ifndef _ASM_X86_PGTABLE_DEFS_H
	2	#define _ASM_X86_PGTABLE_DEFS_H
	3
	4	#include <linux/const.h>
e43623b4	5	#include <asm/page_types.h>
8d19c99f	6
d016bf7e	7	#define FIRST_USER_ADDRESS 0UL
8d19c99f JF	8
	9	#define _PAGE_BIT_PRESENT 0 /* is present */
	10	#define _PAGE_BIT_RW 1 /* writeable */
	11	#define _PAGE_BIT_USER 2 /* userspace addressable */
	12	#define _PAGE_BIT_PWT 3 /* page write through */
	13	#define _PAGE_BIT_PCD 4 /* page cache disabled */
	14	#define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
	15	#define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
	16	#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
	17	#define _PAGE_BIT_PAT 7 /* on 4KB pages */
	18	#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
c46a7c81 MG	19	#define _PAGE_BIT_SOFTW1 9 /* available for programmer */
	20	#define _PAGE_BIT_SOFTW2 10 /* " */
	21	#define _PAGE_BIT_SOFTW3 11 /* " */
8d19c99f	22	#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
5c1d90f5 DH	23	#define _PAGE_BIT_SOFTW4 58 /* available for programmer */
	24	#define _PAGE_BIT_PKEY_BIT0 59 /* Protection Keys, bit 1/4 */
	25	#define _PAGE_BIT_PKEY_BIT1 60 /* Protection Keys, bit 2/4 */
	26	#define _PAGE_BIT_PKEY_BIT2 61 /* Protection Keys, bit 3/4 */
	27	#define _PAGE_BIT_PKEY_BIT3 62 /* Protection Keys, bit 4/4 */
	28	#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
	29
c46a7c81 MG	30	#define _PAGE_BIT_SPECIAL _PAGE_BIT_SOFTW1
c46a7c81 MG	31	#define _PAGE_BIT_CPA_TEST _PAGE_BIT_SOFTW1
c46a7c81 MG	32	#define _PAGE_BIT_HIDDEN _PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
c46a7c81 MG	33	#define _PAGE_BIT_SOFT_DIRTY _PAGE_BIT_SOFTW3 /* software dirty tracking */
5c1d90f5	34	#define _PAGE_BIT_DEVMAP _PAGE_BIT_SOFTW4
8d19c99f JF	35
	36	/* If _PAGE_BIT_PRESENT is clear, we use these: */
	37	/* - if the user mapped it with PROT_NONE; pte_present gives true */
	38	#define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL
8d19c99f JF	39
	40	#define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
	41	#define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
	42	#define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
	43	#define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
	44	#define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
	45	#define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
	46	#define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
	47	#define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
	48	#define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
c46a7c81	49	#define _PAGE_SOFTW1 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
f955371c	50	#define _PAGE_SOFTW2 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
8d19c99f JF	51	#define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
	52	#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
	53	#define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
	54	#define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
5c1d90f5 DH	55	#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
	56	#define _PAGE_PKEY_BIT0 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT0)
	57	#define _PAGE_PKEY_BIT1 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT1)
	58	#define _PAGE_PKEY_BIT2 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT2)
	59	#define _PAGE_PKEY_BIT3 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT3)
	60	#else
	61	#define _PAGE_PKEY_BIT0 (_AT(pteval_t, 0))
	62	#define _PAGE_PKEY_BIT1 (_AT(pteval_t, 0))
	63	#define _PAGE_PKEY_BIT2 (_AT(pteval_t, 0))
	64	#define _PAGE_PKEY_BIT3 (_AT(pteval_t, 0))
	65	#endif
8d19c99f JF	66	#define __HAVE_ARCH_PTE_SPECIAL
8d19c99f JF	67
019132ff DH	68	#define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 \| \
	69	_PAGE_PKEY_BIT1 \| \
	70	_PAGE_PKEY_BIT2 \| \
	71	_PAGE_PKEY_BIT3)
	72
97e3c602 DH	73	#if defined(CONFIG_X86_64) \|\| defined(CONFIG_X86_PAE)
	74	#define _PAGE_KNL_ERRATUM_MASK (_PAGE_DIRTY \| _PAGE_ACCESSED)
	75	#else
	76	#define _PAGE_KNL_ERRATUM_MASK 0
	77	#endif
	78
9d31c506 JF	79	#ifdef CONFIG_KMEMCHECK
	80	#define _PAGE_HIDDEN (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
	81	#else
	82	#define _PAGE_HIDDEN (_AT(pteval_t, 0))
	83	#endif
	84
0f8975ec PE	85	/*
	86	* The same hidden bit is used by kmemcheck, but since kmemcheck
	87	* works on kernel pages while soft-dirty engine on user space,
	88	* they do not conflict with each other.
	89	*/
	90
	91	#ifdef CONFIG_MEM_SOFT_DIRTY
41bb3476	92	#define _PAGE_SOFT_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
0f8975ec PE	93	#else
	94	#define _PAGE_SOFT_DIRTY (_AT(pteval_t, 0))
	95	#endif
	96
179ef71c CG	97	/*
	98	* Tracking soft dirty bit when a page goes to a swap is tricky.
	99	* We need a bit which can be stored in pte _and_ not conflict
	100	* with swap entry format. On x86 bits 6 and 7 are not involved
	101	* into swap entry computation, but bit 6 is used for nonlinear
	102	* file mapping, so we borrow bit 7 for soft dirty tracking.
fa0f281c CG	103	*
	104	* Please note that this bit must be treated as swap dirty page
	105	* mark if and only if the PTE has present bit clear!
179ef71c CG	106	*/
	107	#ifdef CONFIG_MEM_SOFT_DIRTY
	108	#define _PAGE_SWP_SOFT_DIRTY _PAGE_PSE
	109	#else
	110	#define _PAGE_SWP_SOFT_DIRTY (_AT(pteval_t, 0))
	111	#endif
	112
8d19c99f JF	113	#if defined(CONFIG_X86_64) \|\| defined(CONFIG_X86_PAE)
8d19c99f JF	114	#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
69660fd7 DW	115	#define _PAGE_DEVMAP (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
69660fd7 DW	116	#define __HAVE_ARCH_PTE_DEVMAP
8d19c99f JF	117	#else
8d19c99f JF	118	#define _PAGE_NX (_AT(pteval_t, 0))
69660fd7	119	#define _PAGE_DEVMAP (_AT(pteval_t, 0))
8d19c99f JF	120	#endif
8d19c99f JF	121
8d19c99f JF	122	#define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
	123
	124	#define _PAGE_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| \
	125	_PAGE_ACCESSED \| _PAGE_DIRTY)
	126	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED \| \
	127	_PAGE_DIRTY)
	128
8f62c883 DH	129	/*
	130	* Set of bits not changed in pte_modify. The pte's
	131	* protection key is treated like _PAGE_RW, for
	132	* instance, and is not included in this mask since
	133	* pte_modify() does modify it.
	134	*/
8d19c99f	135	#define _PAGE_CHG_MASK (PTE_PFN_MASK \| _PAGE_PCD \| _PAGE_PWT \| \
24f91eba	136	_PAGE_SPECIAL \| _PAGE_ACCESSED \| _PAGE_DIRTY \| \
21d9ee3e MG	137	_PAGE_SOFT_DIRTY)
21d9ee3e MG	138	#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK \| _PAGE_PSE)
8d19c99f	139
281d4078 JG	140	/*
	141	* The cache modes defined here are used to translate between pure SW usage
	142	* and the HW defined cache mode bits and/or PAT entries.
	143	*
	144	* The resulting bits for PWT, PCD and PAT should be chosen in a way
	145	* to have the WB mode at index 0 (all bits clear). This is the default
	146	* right now and likely would break too much if changed.
	147	*/
	148	#ifndef __ASSEMBLY__
	149	enum page_cache_mode {
	150	_PAGE_CACHE_MODE_WB = 0,
	151	_PAGE_CACHE_MODE_WC = 1,
	152	_PAGE_CACHE_MODE_UC_MINUS = 2,
	153	_PAGE_CACHE_MODE_UC = 3,
	154	_PAGE_CACHE_MODE_WT = 4,
	155	_PAGE_CACHE_MODE_WP = 5,
	156	_PAGE_CACHE_MODE_NUM = 8
	157	};
	158	#endif
	159
	160	#define _PAGE_CACHE_MASK (_PAGE_PAT \| _PAGE_PCD \| _PAGE_PWT)
	161	#define _PAGE_NOCACHE (cachemode2protval(_PAGE_CACHE_MODE_UC))
	162
8d19c99f JF	163	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
	164	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| \
	165	_PAGE_ACCESSED \| _PAGE_NX)
	166
	167	#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_RW \| \
	168	_PAGE_USER \| _PAGE_ACCESSED)
	169	#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	170	_PAGE_ACCESSED \| _PAGE_NX)
	171	#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	172	_PAGE_ACCESSED)
	173	#define PAGE_COPY PAGE_COPY_NOEXEC
	174	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	175	_PAGE_ACCESSED \| _PAGE_NX)
	176	#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	177	_PAGE_ACCESSED)
	178
	179	#define __PAGE_KERNEL_EXEC \
	180	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_GLOBAL)
	181	#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC \| _PAGE_NX)
	182
	183	#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
	184	#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
87ad0b71	185	#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL \| _PAGE_NOCACHE)
8d19c99f	186	#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX \| _PAGE_USER)
9fd67b4e	187	#define __PAGE_KERNEL_VVAR (__PAGE_KERNEL_RO \| _PAGE_USER)
8d19c99f	188	#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL \| _PAGE_PSE)
8d19c99f JF	189	#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC \| _PAGE_PSE)
8d19c99f JF	190
f955371c DV	191	#define __PAGE_KERNEL_IO (__PAGE_KERNEL)
f955371c DV	192	#define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE)
8d19c99f JF	193
	194	#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
	195	#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
	196	#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
	197	#define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
8d19c99f	198	#define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
8d19c99f	199	#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
8d19c99f JF	200	#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
8d19c99f JF	201	#define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
9fd67b4e	202	#define PAGE_KERNEL_VVAR __pgprot(__PAGE_KERNEL_VVAR)
8d19c99f JF	203
	204	#define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
	205	#define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
8d19c99f JF	206
	207	/* xwr */
	208	#define __P000 PAGE_NONE
	209	#define __P001 PAGE_READONLY
	210	#define __P010 PAGE_COPY
	211	#define __P011 PAGE_COPY
	212	#define __P100 PAGE_READONLY_EXEC
	213	#define __P101 PAGE_READONLY_EXEC
	214	#define __P110 PAGE_COPY_EXEC
	215	#define __P111 PAGE_COPY_EXEC
	216
	217	#define __S000 PAGE_NONE
	218	#define __S001 PAGE_READONLY
	219	#define __S010 PAGE_SHARED
	220	#define __S011 PAGE_SHARED
	221	#define __S100 PAGE_READONLY_EXEC
	222	#define __S101 PAGE_READONLY_EXEC
	223	#define __S110 PAGE_SHARED_EXEC
	224	#define __S111 PAGE_SHARED_EXEC
	225
	226	/*
	227	* early identity mapping pte attrib macros.
	228	*/
	229	#ifdef CONFIG_X86_64
	230	#define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
	231	#else
8d19c99f	232	#define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
7dda0387	233	#define PDE_IDENT_ATTR 0x063 /* PRESENT+RW+DIRTY+ACCESSED */
8d19c99f JF	234	#define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
	235	#endif
	236
54321d94	237	#ifdef CONFIG_X86_32
a1ce3928	238	# include <asm/pgtable_32_types.h>
54321d94	239	#else
a1ce3928	240	# include <asm/pgtable_64_types.h>
54321d94 JF	241	#endif
54321d94 JF	242
8d19c99f JF	243	#ifndef __ASSEMBLY__
8d19c99f JF	244
54321d94 JF	245	#include <linux/types.h>
54321d94 JF	246
4be4c1fb	247	/* Extracts the PFN from a (pte\|pmd\|pud\|pgd)val_t of a 4KB page */
9b3651cb JF	248	#define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK)
9b3651cb JF	249
8f62c883 DH	250	/*
	251	* Extracts the flags from a (pte\|pmd\|pud\|pgd)val_t
	252	* This includes the protection key value.
	253	*/
9b3651cb JF	254	#define PTE_FLAGS_MASK (~PTE_PFN_MASK)
9b3651cb JF	255
54321d94 JF	256	typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
	257
	258	typedef struct { pgdval_t pgd; } pgd_t;
	259
	260	static inline pgd_t native_make_pgd(pgdval_t val)
	261	{
	262	return (pgd_t) { val };
	263	}
	264
	265	static inline pgdval_t native_pgd_val(pgd_t pgd)
	266	{
	267	return pgd.pgd;
	268	}
	269
	270	static inline pgdval_t pgd_flags(pgd_t pgd)
	271	{
	272	return native_pgd_val(pgd) & PTE_FLAGS_MASK;
	273	}
	274
98233368	275	#if CONFIG_PGTABLE_LEVELS > 3
54321d94 JF	276	typedef struct { pudval_t pud; } pud_t;
	277
	278	static inline pud_t native_make_pud(pmdval_t val)
	279	{
	280	return (pud_t) { val };
	281	}
	282
	283	static inline pudval_t native_pud_val(pud_t pud)
	284	{
	285	return pud.pud;
	286	}
	287	#else
	288	#include <asm-generic/pgtable-nopud.h>
	289
	290	static inline pudval_t native_pud_val(pud_t pud)
	291	{
	292	return native_pgd_val(pud.pgd);
	293	}
	294	#endif
	295
98233368	296	#if CONFIG_PGTABLE_LEVELS > 2
54321d94 JF	297	typedef struct { pmdval_t pmd; } pmd_t;
	298
	299	static inline pmd_t native_make_pmd(pmdval_t val)
	300	{
	301	return (pmd_t) { val };
	302	}
	303
	304	static inline pmdval_t native_pmd_val(pmd_t pmd)
	305	{
	306	return pmd.pmd;
	307	}
	308	#else
	309	#include <asm-generic/pgtable-nopmd.h>
	310
	311	static inline pmdval_t native_pmd_val(pmd_t pmd)
	312	{
	313	return native_pgd_val(pmd.pud.pgd);
	314	}
	315	#endif
	316
4be4c1fb TK	317	static inline pudval_t pud_pfn_mask(pud_t pud)
	318	{
	319	if (native_pud_val(pud) & _PAGE_PSE)
70f15287	320	return PHYSICAL_PUD_PAGE_MASK;
4be4c1fb TK	321	else
	322	return PTE_PFN_MASK;
	323	}
	324
	325	static inline pudval_t pud_flags_mask(pud_t pud)
	326	{
70f15287	327	return ~pud_pfn_mask(pud);
4be4c1fb TK	328	}
4be4c1fb TK	329
54321d94 JF	330	static inline pudval_t pud_flags(pud_t pud)
54321d94 JF	331	{
f70abb0f	332	return native_pud_val(pud) & pud_flags_mask(pud);
54321d94 JF	333	}
54321d94 JF	334
4be4c1fb TK	335	static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
	336	{
	337	if (native_pmd_val(pmd) & _PAGE_PSE)
70f15287	338	return PHYSICAL_PMD_PAGE_MASK;
4be4c1fb TK	339	else
	340	return PTE_PFN_MASK;
	341	}
	342
	343	static inline pmdval_t pmd_flags_mask(pmd_t pmd)
	344	{
70f15287	345	return ~pmd_pfn_mask(pmd);
4be4c1fb TK	346	}
4be4c1fb TK	347
54321d94 JF	348	static inline pmdval_t pmd_flags(pmd_t pmd)
54321d94 JF	349	{
f70abb0f	350	return native_pmd_val(pmd) & pmd_flags_mask(pmd);
54321d94 JF	351	}
	352
	353	static inline pte_t native_make_pte(pteval_t val)
	354	{
	355	return (pte_t) { .pte = val };
	356	}
	357
	358	static inline pteval_t native_pte_val(pte_t pte)
	359	{
	360	return pte.pte;
	361	}
	362
	363	static inline pteval_t pte_flags(pte_t pte)
	364	{
	365	return native_pte_val(pte) & PTE_FLAGS_MASK;
	366	}
	367
	368	#define pgprot_val(x) ((x).pgprot)
	369	#define __pgprot(x) ((pgprot_t) { (x) } )
	370
281d4078 JG	371	extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
	372	extern uint8_t __pte2cachemode_tbl[8];
	373
	374	#define __pte2cm_idx(cb) \
	375	((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) \| \
	376	(((cb) >> (_PAGE_BIT_PCD - 1)) & 2) \| \
	377	(((cb) >> _PAGE_BIT_PWT) & 1))
bd809af1 JG	378	#define __cm_idx2pte(i) \
	379	((((i) & 4) << (_PAGE_BIT_PAT - 2)) \| \
	380	(((i) & 2) << (_PAGE_BIT_PCD - 1)) \| \
	381	(((i) & 1) << _PAGE_BIT_PWT))
281d4078 JG	382
	383	static inline unsigned long cachemode2protval(enum page_cache_mode pcm)
	384	{
	385	if (likely(pcm == 0))
	386	return 0;
	387	return __cachemode2pte_tbl[pcm];
	388	}
	389	static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
	390	{
	391	return __pgprot(cachemode2protval(pcm));
	392	}
	393	static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
	394	{
	395	unsigned long masked;
	396
	397	masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
	398	if (likely(masked == 0))
	399	return 0;
	400	return __pte2cachemode_tbl[__pte2cm_idx(masked)];
	401	}
	402	static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
	403	{
3625c2c2	404	pgprotval_t val = pgprot_val(pgprot);
281d4078	405	pgprot_t new;
281d4078	406
281d4078 JG	407	pgprot_val(new) = (val & ~(_PAGE_PAT \| _PAGE_PAT_LARGE)) \|
	408	((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
	409	return new;
	410	}
	411	static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
	412	{
3625c2c2	413	pgprotval_t val = pgprot_val(pgprot);
281d4078	414	pgprot_t new;
281d4078	415
281d4078 JG	416	pgprot_val(new) = (val & ~(_PAGE_PAT \| _PAGE_PAT_LARGE)) \|
	417	((val & _PAGE_PAT_LARGE) >>
	418	(_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
	419	return new;
	420	}
	421
54321d94 JF	422
	423	typedef struct page *pgtable_t;
	424
8d19c99f	425	extern pteval_t __supported_pte_mask;
c44c9ec0	426	extern void set_nx(void);
54321d94	427	extern int nx_enabled;
8d19c99f JF	428
	429	#define pgprot_writecombine pgprot_writecombine
	430	extern pgprot_t pgprot_writecombine(pgprot_t prot);
	431
d1b4bfbf TK	432	#define pgprot_writethrough pgprot_writethrough
	433	extern pgprot_t pgprot_writethrough(pgprot_t prot);
	434
8d19c99f JF	435	/* Indicate that x86 has its own track and untrack pfn vma functions */
	436	#define __HAVE_PFNMAP_TRACKING
	437
	438	#define __HAVE_PHYS_MEM_ACCESS_PROT
	439	struct file;
	440	pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
	441	unsigned long size, pgprot_t vma_prot);
	442	int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
	443	unsigned long size, pgprot_t *vma_prot);
	444
	445	/* Install a pte for a particular vaddr in kernel space. */
	446	void set_pte_vaddr(unsigned long vaddr, pte_t pte);
	447
	448	#ifdef CONFIG_X86_32
7737b215	449	extern void native_pagetable_init(void);
8d19c99f	450	#else
843b8ed2	451	#define native_pagetable_init paging_init
8d19c99f JF	452	#endif
	453
	454	struct seq_file;
	455	extern void arch_report_meminfo(struct seq_file *m);
	456
4cbeb51b	457	enum pg_level {
8d19c99f JF	458	PG_LEVEL_NONE,
	459	PG_LEVEL_4K,
	460	PG_LEVEL_2M,
	461	PG_LEVEL_1G,
	462	PG_LEVEL_NUM
	463	};
	464
	465	#ifdef CONFIG_PROC_FS
	466	extern void update_page_count(int level, unsigned long pages);
	467	#else
	468	static inline void update_page_count(int level, unsigned long pages) { }
	469	#endif
	470
	471	/*
	472	* Helper function that returns the kernel pagetable entry controlling
	473	* the virtual address 'address'. NULL means no pagetable entry present.
	474	* NOTE: the return type is pte_t but if the pmd is PSE then we return it
	475	* as a pte too.
	476	*/
	477	extern pte_t lookup_address(unsigned long address, unsigned int level);
426e34cc MF	478	extern pte_t lookup_address_in_pgd(pgd_t pgd, unsigned long address,
426e34cc MF	479	unsigned int *level);
792230c3	480	extern pmd_t *lookup_pmd_address(unsigned long address);
d7656534	481	extern phys_addr_t slow_virt_to_phys(void *__address);
d2f7cbe7 BP	482	extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
d2f7cbe7 BP	483	unsigned numpages, unsigned long page_flags);
8d19c99f JF	484	#endif /* !__ASSEMBLY__ */
	485
	486	#endif /* _ASM_X86_PGTABLE_DEFS_H */