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

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PGTABLE_DEFS_H
#define _ASM_X86_PGTABLE_DEFS_H

#include <linux/const.h>
#include <linux/mem_encrypt.h>

#include <asm/page_types.h>

#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	57	/* available for programmer */
#define _PAGE_BIT_SOFTW5	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_UFFD_WP	_PAGE_BIT_SOFTW2 /* userfaultfd wrprotected */
#define _PAGE_BIT_SOFT_DIRTY	_PAGE_BIT_SOFTW3 /* software dirty tracking */
#define _PAGE_BIT_DEVMAP	_PAGE_BIT_SOFTW4

#ifdef CONFIG_X86_64
#define _PAGE_BIT_SAVED_DIRTY	_PAGE_BIT_SOFTW5 /* Saved Dirty bit */
#else
/* Shared with _PAGE_BIT_UFFD_WP which is not supported on 32 bit */
#define _PAGE_BIT_SAVED_DIRTY	_PAGE_BIT_SOFTW2 /* Saved Dirty bit */
#endif

/* 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_SOFTW3	(_AT(pteval_t, 1) << _PAGE_BIT_SOFTW3)
#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 _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_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 1-4 are *not* involved
 * into swap entry computation, but bit 7 is used for thp migration,
 * so we borrow bit 1 for soft dirty tracking.
 *
 * Please note that this bit must be treated as swap dirty page
 * mark if and only if the PTE/PMD has present bit clear!
 */
#ifdef CONFIG_MEM_SOFT_DIRTY
#define _PAGE_SWP_SOFT_DIRTY	_PAGE_RW
#else
#define _PAGE_SWP_SOFT_DIRTY	(_AT(pteval_t, 0))
#endif

#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
#define _PAGE_UFFD_WP		(_AT(pteval_t, 1) << _PAGE_BIT_UFFD_WP)
#define _PAGE_SWP_UFFD_WP	_PAGE_USER
#else
#define _PAGE_UFFD_WP		(_AT(pteval_t, 0))
#define _PAGE_SWP_UFFD_WP	(_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 _PAGE_SOFTW4	(_AT(pteval_t, 1) << _PAGE_BIT_SOFTW4)
#else
#define _PAGE_NX	(_AT(pteval_t, 0))
#define _PAGE_DEVMAP	(_AT(pteval_t, 0))
#define _PAGE_SOFTW4	(_AT(pteval_t, 0))
#endif

/*
 * The hardware requires shadow stack to be Write=0,Dirty=1. However,
 * there are valid cases where the kernel might create read-only PTEs that
 * are dirty (e.g., fork(), mprotect(), uffd-wp(), soft-dirty tracking). In
 * this case, the _PAGE_SAVED_DIRTY bit is used instead of the HW-dirty bit,
 * to avoid creating a wrong "shadow stack" PTEs. Such PTEs have
 * (Write=0,SavedDirty=1,Dirty=0) set.
 */
#define _PAGE_SAVED_DIRTY	(_AT(pteval_t, 1) << _PAGE_BIT_SAVED_DIRTY)

#define _PAGE_DIRTY_BITS (_PAGE_DIRTY | _PAGE_SAVED_DIRTY)

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

/*
 * 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 _COMMON_PAGE_CHG_MASK	(PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |	\
				 _PAGE_SPECIAL | _PAGE_ACCESSED |	\
				 _PAGE_DIRTY_BITS | _PAGE_SOFT_DIRTY |	\
				 _PAGE_DEVMAP | _PAGE_CC | _PAGE_UFFD_WP)
#define _PAGE_CHG_MASK	(_COMMON_PAGE_CHG_MASK | _PAGE_PAT)
#define _HPAGE_CHG_MASK (_COMMON_PAGE_CHG_MASK | _PAGE_PSE | _PAGE_PAT_LARGE)

/*
 * 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_CC		(_AT(pteval_t, cc_mask))
#define _PAGE_ENC		(_AT(pteval_t, sme_me_mask))

#define _PAGE_CACHE_MASK	(_PAGE_PWT | _PAGE_PCD | _PAGE_PAT)
#define _PAGE_LARGE_CACHE_MASK	(_PAGE_PWT | _PAGE_PCD | _PAGE_PAT_LARGE)

#define _PAGE_NOCACHE		(cachemode2protval(_PAGE_CACHE_MODE_UC))
#define _PAGE_CACHE_WP		(cachemode2protval(_PAGE_CACHE_MODE_WP))

#define __PP _PAGE_PRESENT
#define __RW _PAGE_RW
#define _USR _PAGE_USER
#define ___A _PAGE_ACCESSED
#define ___D _PAGE_DIRTY
#define ___G _PAGE_GLOBAL
#define __NX _PAGE_NX

#define _ENC _PAGE_ENC
#define __WP _PAGE_CACHE_WP
#define __NC _PAGE_NOCACHE
#define _PSE _PAGE_PSE

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

#define PAGE_NONE	     __pg(   0|   0|   0|___A|   0|   0|   0|___G)
#define PAGE_SHARED	     __pg(__PP|__RW|_USR|___A|__NX|   0|   0|   0)
#define PAGE_SHARED_EXEC     __pg(__PP|__RW|_USR|___A|   0|   0|   0|   0)
#define PAGE_COPY_NOEXEC     __pg(__PP|   0|_USR|___A|__NX|   0|   0|   0)
#define PAGE_COPY_EXEC	     __pg(__PP|   0|_USR|___A|   0|   0|   0|   0)
#define PAGE_COPY	     __pg(__PP|   0|_USR|___A|__NX|   0|   0|   0)
#define PAGE_READONLY	     __pg(__PP|   0|_USR|___A|__NX|   0|   0|   0)
#define PAGE_READONLY_EXEC   __pg(__PP|   0|_USR|___A|   0|   0|   0|   0)

#define __PAGE_KERNEL		 (__PP|__RW|   0|___A|__NX|___D|   0|___G)
#define __PAGE_KERNEL_EXEC	 (__PP|__RW|   0|___A|   0|___D|   0|___G)

/*
 * Page tables needs to have Write=1 in order for any lower PTEs to be
 * writable. This includes shadow stack memory (Write=0, Dirty=1)
 */
#define _KERNPG_TABLE_NOENC	 (__PP|__RW|   0|___A|   0|___D|   0|   0)
#define _KERNPG_TABLE		 (__PP|__RW|   0|___A|   0|___D|   0|   0| _ENC)
#define _PAGE_TABLE_NOENC	 (__PP|__RW|_USR|___A|   0|___D|   0|   0)
#define _PAGE_TABLE		 (__PP|__RW|_USR|___A|   0|___D|   0|   0| _ENC)

#define __PAGE_KERNEL_RO	 (__PP|   0|   0|___A|__NX|   0|   0|___G)
#define __PAGE_KERNEL_ROX	 (__PP|   0|   0|___A|   0|   0|   0|___G)
#define __PAGE_KERNEL		 (__PP|__RW|   0|___A|__NX|___D|   0|___G)
#define __PAGE_KERNEL_EXEC	 (__PP|__RW|   0|___A|   0|___D|   0|___G)
#define __PAGE_KERNEL_NOCACHE	 (__PP|__RW|   0|___A|__NX|___D|   0|___G| __NC)
#define __PAGE_KERNEL_VVAR	 (__PP|   0|_USR|___A|__NX|   0|   0|___G)
#define __PAGE_KERNEL_LARGE	 (__PP|__RW|   0|___A|__NX|___D|_PSE|___G)
#define __PAGE_KERNEL_LARGE_EXEC (__PP|__RW|   0|___A|   0|___D|_PSE|___G)
#define __PAGE_KERNEL_WP	 (__PP|__RW|   0|___A|__NX|___D|   0|___G| __WP)


#define __PAGE_KERNEL_IO		__PAGE_KERNEL
#define __PAGE_KERNEL_IO_NOCACHE	__PAGE_KERNEL_NOCACHE


#ifndef __ASSEMBLY__

#define __PAGE_KERNEL_ENC	(__PAGE_KERNEL    | _ENC)
#define __PAGE_KERNEL_ENC_WP	(__PAGE_KERNEL_WP | _ENC)
#define __PAGE_KERNEL_NOENC	(__PAGE_KERNEL    |    0)
#define __PAGE_KERNEL_NOENC_WP	(__PAGE_KERNEL_WP |    0)

#define __pgprot_mask(x)	__pgprot((x) & __default_kernel_pte_mask)

#define PAGE_KERNEL		__pgprot_mask(__PAGE_KERNEL            | _ENC)
#define PAGE_KERNEL_NOENC	__pgprot_mask(__PAGE_KERNEL            |    0)
#define PAGE_KERNEL_RO		__pgprot_mask(__PAGE_KERNEL_RO         | _ENC)
#define PAGE_KERNEL_EXEC	__pgprot_mask(__PAGE_KERNEL_EXEC       | _ENC)
#define PAGE_KERNEL_EXEC_NOENC	__pgprot_mask(__PAGE_KERNEL_EXEC       |    0)
#define PAGE_KERNEL_ROX		__pgprot_mask(__PAGE_KERNEL_ROX        | _ENC)
#define PAGE_KERNEL_NOCACHE	__pgprot_mask(__PAGE_KERNEL_NOCACHE    | _ENC)
#define PAGE_KERNEL_LARGE	__pgprot_mask(__PAGE_KERNEL_LARGE      | _ENC)
#define PAGE_KERNEL_LARGE_EXEC	__pgprot_mask(__PAGE_KERNEL_LARGE_EXEC | _ENC)
#define PAGE_KERNEL_VVAR	__pgprot_mask(__PAGE_KERNEL_VVAR       | _ENC)

#define PAGE_KERNEL_IO		__pgprot_mask(__PAGE_KERNEL_IO)
#define PAGE_KERNEL_IO_NOCACHE	__pgprot_mask(__PAGE_KERNEL_IO_NOCACHE)

#endif	/* __ASSEMBLY__ */

/*
 * 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 pgprot_t pgprot_nx(pgprot_t prot)
{
	return __pgprot(pgprot_val(prot) | _PAGE_NX);
}
#define pgprot_nx pgprot_nx

#ifdef CONFIG_X86_PAE

/*
 * PHYSICAL_PAGE_MASK might be non-constant when SME is compiled in, so we can't
 * use it here.
 */

#define PGD_PAE_PAGE_MASK	((signed long)PAGE_MASK)
#define PGD_PAE_PHYS_MASK	(((1ULL << __PHYSICAL_MASK_SHIFT)-1) & PGD_PAE_PAGE_MASK)

/*
 * PAE allows Base Address, P, PWT, PCD and AVL bits to be set in PGD entries.
 * All other bits are Reserved MBZ
 */
#define PGD_ALLOWED_BITS	(PGD_PAE_PHYS_MASK | _PAGE_PRESENT | \
				 _PAGE_PWT | _PAGE_PCD | \
				 _PAGE_SOFTW1 | _PAGE_SOFTW2 | _PAGE_SOFTW3)

#else
/* No need to mask any bits for !PAE */
#define PGD_ALLOWED_BITS	(~0ULL)
#endif

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

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

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

#if CONFIG_PGTABLE_LEVELS > 4
typedef struct { p4dval_t p4d; } p4d_t;

static inline p4d_t native_make_p4d(pudval_t val)
{
	return (p4d_t) { val };
}

static inline p4dval_t native_p4d_val(p4d_t p4d)
{
	return p4d.p4d;
}
#else
#include <asm-generic/pgtable-nop4d.h>

static inline p4d_t native_make_p4d(pudval_t val)
{
	return (p4d_t) { .pgd = native_make_pgd((pgdval_t)val) };
}

static inline p4dval_t native_p4d_val(p4d_t p4d)
{
	return native_pgd_val(p4d.pgd);
}
#endif

#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 pud_t native_make_pud(pudval_t val)
{
	return (pud_t) { .p4d.pgd = native_make_pgd(val) };
}

static inline pudval_t native_pud_val(pud_t pud)
{
	return native_pgd_val(pud.p4d.pgd);
}
#endif

#if CONFIG_PGTABLE_LEVELS > 2
static inline pmd_t native_make_pmd(pmdval_t val)
{
	return (pmd_t) { .pmd = val };
}

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

static inline pmd_t native_make_pmd(pmdval_t val)
{
	return (pmd_t) { .pud.p4d.pgd = native_make_pgd(val) };
}

static inline pmdval_t native_pmd_val(pmd_t pmd)
{
	return native_pgd_val(pmd.pud.p4d.pgd);
}
#endif

static inline p4dval_t p4d_pfn_mask(p4d_t p4d)
{
	/* No 512 GiB huge pages yet */
	return PTE_PFN_MASK;
}

static inline p4dval_t p4d_flags_mask(p4d_t p4d)
{
	return ~p4d_pfn_mask(p4d);
}

static inline p4dval_t p4d_flags(p4d_t p4d)
{
	return native_p4d_val(p4d) & p4d_flags_mask(p4d);
}

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 __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))

unsigned long cachemode2protval(enum page_cache_mode pcm);

static inline pgprotval_t protval_4k_2_large(pgprotval_t val)
{
	return (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
		((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
}
static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
{
	return __pgprot(protval_4k_2_large(pgprot_val(pgprot)));
}
static inline pgprotval_t protval_large_2_4k(pgprotval_t val)
{
	return (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
		((val & _PAGE_PAT_LARGE) >>
		 (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
}
static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
{
	return __pgprot(protval_large_2_4k(pgprot_val(pgprot)));
}


typedef struct page *pgtable_t;

extern pteval_t __supported_pte_mask;
extern pteval_t __default_kernel_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);

/* 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

enum pg_level {
	PG_LEVEL_NONE,
	PG_LEVEL_4K,
	PG_LEVEL_2M,
	PG_LEVEL_1G,
	PG_LEVEL_512G,
	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 __init kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn,
					  unsigned long address,
					  unsigned numpages,
					  unsigned long page_flags);
extern int __init kernel_unmap_pages_in_pgd(pgd_t *pgd, unsigned long address,
					    unsigned long numpages);
#endif	/* !__ASSEMBLY__ */

#endif /* _ASM_X86_PGTABLE_DEFS_H */