[mirror_ubuntu-bionic-kernel.git] / include / asm-x86 / pgtable.h

#ifndef _ASM_X86_PGTABLE_H
#define _ASM_X86_PGTABLE_H

#define FIRST_USER_ADDRESS	0

#define _PAGE_BIT_PRESENT	0	/* is present */
#define _PAGE_BIT_RW		1	/* writeable */
#define _PAGE_BIT_USER		2	/* userspace addressable */
#define _PAGE_BIT_PWT		3	/* page write through */
#define _PAGE_BIT_PCD		4	/* page cache disabled */
#define _PAGE_BIT_ACCESSED	5	/* was accessed (raised by CPU) */
#define _PAGE_BIT_DIRTY		6	/* was written to (raised by CPU) */
#define _PAGE_BIT_FILE		6
#define _PAGE_BIT_PSE		7	/* 4 MB (or 2MB) page */
#define _PAGE_BIT_PAT		7	/* on 4KB pages */
#define _PAGE_BIT_GLOBAL	8	/* Global TLB entry PPro+ */
#define _PAGE_BIT_UNUSED1	9	/* available for programmer */
#define _PAGE_BIT_UNUSED2	10
#define _PAGE_BIT_UNUSED3	11
#define _PAGE_BIT_PAT_LARGE	12	/* On 2MB or 1GB pages */
#define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */

/*
 * Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a
 * sign-extended value on 32-bit with all 1's in the upper word,
 * which preserves the upper pte values on 64-bit ptes:
 */
#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)
#define _PAGE_PAT	(_AC(1, L)<<_PAGE_BIT_PAT)
#define _PAGE_PAT_LARGE (_AC(1, L)<<_PAGE_BIT_PAT_LARGE)

#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_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)

#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 pteval_t __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_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_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_WC			MAKE_GLOBAL(__PAGE_KERNEL_WC)
#define PAGE_KERNEL_NOCACHE		MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
#define PAGE_KERNEL_UC_MINUS		MAKE_GLOBAL(__PAGE_KERNEL_UC_MINUS)
#define PAGE_KERNEL_EXEC_NOCACHE	MAKE_GLOBAL(__PAGE_KERNEL_EXEC_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))

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_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 pte_global(pte_t pte)
{
	return pte_val(pte) & _PAGE_GLOBAL;
}

static inline int pte_exec(pte_t pte)
{
	return !(pte_val(pte) & _PAGE_NX);
}

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) & ~(pteval_t)_PAGE_DIRTY);
}

static inline pte_t pte_mkold(pte_t pte)
{
	return __pte(pte_val(pte) & ~(pteval_t)_PAGE_ACCESSED);
}

static inline pte_t pte_wrprotect(pte_t pte)
{
	return __pte(pte_val(pte) & ~(pteval_t)_PAGE_RW);
}

static inline pte_t pte_mkexec(pte_t pte)
{
	return __pte(pte_val(pte) & ~(pteval_t)_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) & ~(pteval_t)_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) & ~(pteval_t)_PAGE_GLOBAL);
}

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);
}

#define pte_pgprot(x) __pgprot(pte_val(x) & (0xfff | _PAGE_NX))

#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

#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)
#endif	/* CONFIG_PARAVIRT */

#endif	/* __ASSEMBLY__ */

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

#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,
};

/*
 * 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.
 */
#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
6c386655 JF	1	#ifndef _ASM_X86_PGTABLE_H
	2	#define _ASM_X86_PGTABLE_H
	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+ */
	17	#define _PAGE_BIT_UNUSED1 9 /* available for programmer */
	18	#define _PAGE_BIT_UNUSED2 10
	19	#define _PAGE_BIT_UNUSED3 11
9bf5a475	20	#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
6c386655 JF	21	#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
6c386655 JF	22
f2919232 JF	23	/*
	24	* Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a
	25	* sign-extended value on 32-bit with all 1's in the upper word,
	26	* which preserves the upper pte values on 64-bit ptes:
	27	*/
61f38226 IM	28	#define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT)
	29	#define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW)
	30	#define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER)
	31	#define _PAGE_PWT (_AC(1, L)<<_PAGE_BIT_PWT)
	32	#define _PAGE_PCD (_AC(1, L)<<_PAGE_BIT_PCD)
	33	#define _PAGE_ACCESSED (_AC(1, L)<<_PAGE_BIT_ACCESSED)
	34	#define _PAGE_DIRTY (_AC(1, L)<<_PAGE_BIT_DIRTY)
	35	#define _PAGE_PSE (_AC(1, L)<<_PAGE_BIT_PSE) /* 2MB page */
	36	#define _PAGE_GLOBAL (_AC(1, L)<<_PAGE_BIT_GLOBAL) /* Global TLB entry */
	37	#define _PAGE_UNUSED1 (_AC(1, L)<<_PAGE_BIT_UNUSED1)
	38	#define _PAGE_UNUSED2 (_AC(1, L)<<_PAGE_BIT_UNUSED2)
	39	#define _PAGE_UNUSED3 (_AC(1, L)<<_PAGE_BIT_UNUSED3)
9bf5a475 AK	40	#define _PAGE_PAT (_AC(1, L)<<_PAGE_BIT_PAT)
9bf5a475 AK	41	#define _PAGE_PAT_LARGE (_AC(1, L)<<_PAGE_BIT_PAT_LARGE)
6c386655 JF	42
	43	#if defined(CONFIG_X86_64) \|\| defined(CONFIG_X86_PAE)
	44	#define _PAGE_NX (_AC(1, ULL) << _PAGE_BIT_NX)
	45	#else
	46	#define _PAGE_NX 0
	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 JF	59
	60	#define _PAGE_CHG_MASK (PTE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	61
2e5d9c85	62	#define _PAGE_CACHE_MASK (_PAGE_PCD \| _PAGE_PWT)
	63	#define _PAGE_CACHE_WB (0)
	64	#define _PAGE_CACHE_WC (_PAGE_PWT)
	65	#define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
	66	#define _PAGE_CACHE_UC (_PAGE_PCD \| _PAGE_PWT)
	67
6c386655	68	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
3cbaeafe JP	69	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| \
	70	_PAGE_ACCESSED \| _PAGE_NX)
	71
	72	#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_RW \| \
	73	_PAGE_USER \| _PAGE_ACCESSED)
	74	#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	75	_PAGE_ACCESSED \| _PAGE_NX)
	76	#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	77	_PAGE_ACCESSED)
6c386655	78	#define PAGE_COPY PAGE_COPY_NOEXEC
3cbaeafe JP	79	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	80	_PAGE_ACCESSED \| _PAGE_NX)
	81	#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| \
	82	_PAGE_ACCESSED)
6c386655 JF	83
	84	#ifdef CONFIG_X86_32
	85	#define _PAGE_KERNEL_EXEC \
	86	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED)
	87	#define _PAGE_KERNEL (_PAGE_KERNEL_EXEC \| _PAGE_NX)
	88
	89	#ifndef __ASSEMBLY__
c93c82bb	90	extern pteval_t __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
6c386655 JF	91	#endif /* __ASSEMBLY__ */
	92	#else
	93	#define __PAGE_KERNEL_EXEC \
	94	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED)
	95	#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC \| _PAGE_NX)
	96	#endif
	97
	98	#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
	99	#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
d2e626f4	100	#define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC \| _PAGE_PCD \| _PAGE_PWT)
b310f381	101	#define __PAGE_KERNEL_WC (__PAGE_KERNEL \| _PAGE_CACHE_WC)
6c386655	102	#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL \| _PAGE_PCD \| _PAGE_PWT)
d546b67a	103	#define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL \| _PAGE_PCD)
6c386655 JF	104	#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX \| _PAGE_USER)
	105	#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL \| _PAGE_PCD \| _PAGE_PWT)
	106	#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL \| _PAGE_PSE)
	107	#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC \| _PAGE_PSE)
	108
	109	#ifdef CONFIG_X86_32
	110	# define MAKE_GLOBAL(x) __pgprot((x))
	111	#else
	112	# define MAKE_GLOBAL(x) __pgprot((x) \| _PAGE_GLOBAL)
	113	#endif
	114
	115	#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
	116	#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
	117	#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
	118	#define PAGE_KERNEL_RX MAKE_GLOBAL(__PAGE_KERNEL_RX)
b310f381	119	#define PAGE_KERNEL_WC MAKE_GLOBAL(__PAGE_KERNEL_WC)
6c386655	120	#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
d546b67a	121	#define PAGE_KERNEL_UC_MINUS MAKE_GLOBAL(__PAGE_KERNEL_UC_MINUS)
d2e626f4	122	#define PAGE_KERNEL_EXEC_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_EXEC_NOCACHE)
6c386655 JF	123	#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
	124	#define PAGE_KERNEL_LARGE_EXEC MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
	125	#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
	126	#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
	127
	128	/* xwr */
	129	#define __P000 PAGE_NONE
	130	#define __P001 PAGE_READONLY
	131	#define __P010 PAGE_COPY
	132	#define __P011 PAGE_COPY
	133	#define __P100 PAGE_READONLY_EXEC
	134	#define __P101 PAGE_READONLY_EXEC
	135	#define __P110 PAGE_COPY_EXEC
	136	#define __P111 PAGE_COPY_EXEC
	137
	138	#define __S000 PAGE_NONE
	139	#define __S001 PAGE_READONLY
	140	#define __S010 PAGE_SHARED
	141	#define __S011 PAGE_SHARED
	142	#define __S100 PAGE_READONLY_EXEC
	143	#define __S101 PAGE_READONLY_EXEC
	144	#define __S110 PAGE_SHARED_EXEC
	145	#define __S111 PAGE_SHARED_EXEC
	146
4614139c	147	#ifndef __ASSEMBLY__
195466dc	148
8405b122 JF	149	/*
	150	* ZERO_PAGE is a global shared page that is always zero: used
	151	* for zero-mapped memory areas etc..
	152	*/
3cbaeafe	153	extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
8405b122 JF	154	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
8405b122 JF	155
e3ed910d JF	156	extern spinlock_t pgd_lock;
e3ed910d JF	157	extern struct list_head pgd_list;
8405b122	158
4614139c JF	159	/*
	160	* The following only work if pte_present() is true.
	161	* Undefined behaviour if not..
	162	*/
3cbaeafe JP	163	static inline int pte_dirty(pte_t pte)
	164	{
	165	return pte_val(pte) & _PAGE_DIRTY;
	166	}
	167
	168	static inline int pte_young(pte_t pte)
	169	{
	170	return pte_val(pte) & _PAGE_ACCESSED;
	171	}
	172
	173	static inline int pte_write(pte_t pte)
	174	{
	175	return pte_val(pte) & _PAGE_RW;
	176	}
	177
	178	static inline int pte_file(pte_t pte)
	179	{
	180	return pte_val(pte) & _PAGE_FILE;
	181	}
	182
	183	static inline int pte_huge(pte_t pte)
	184	{
	185	return pte_val(pte) & _PAGE_PSE;
4614139c JF	186	}
4614139c JF	187
3cbaeafe JP	188	static inline int pte_global(pte_t pte)
	189	{
	190	return pte_val(pte) & _PAGE_GLOBAL;
	191	}
	192
	193	static inline int pte_exec(pte_t pte)
	194	{
	195	return !(pte_val(pte) & _PAGE_NX);
	196	}
	197
	198	static inline int pmd_large(pmd_t pte)
	199	{
	200	return (pmd_val(pte) & (_PAGE_PSE \| _PAGE_PRESENT)) ==
	201	(_PAGE_PSE \| _PAGE_PRESENT);
	202	}
	203
	204	static inline pte_t pte_mkclean(pte_t pte)
	205	{
	206	return __pte(pte_val(pte) & ~(pteval_t)_PAGE_DIRTY);
	207	}
	208
	209	static inline pte_t pte_mkold(pte_t pte)
	210	{
	211	return __pte(pte_val(pte) & ~(pteval_t)_PAGE_ACCESSED);
	212	}
	213
	214	static inline pte_t pte_wrprotect(pte_t pte)
	215	{
	216	return __pte(pte_val(pte) & ~(pteval_t)_PAGE_RW);
	217	}
	218
	219	static inline pte_t pte_mkexec(pte_t pte)
	220	{
	221	return __pte(pte_val(pte) & ~(pteval_t)_PAGE_NX);
	222	}
	223
	224	static inline pte_t pte_mkdirty(pte_t pte)
	225	{
	226	return __pte(pte_val(pte) \| _PAGE_DIRTY);
	227	}
	228
	229	static inline pte_t pte_mkyoung(pte_t pte)
	230	{
	231	return __pte(pte_val(pte) \| _PAGE_ACCESSED);
	232	}
	233
	234	static inline pte_t pte_mkwrite(pte_t pte)
	235	{
	236	return __pte(pte_val(pte) \| _PAGE_RW);
	237	}
	238
	239	static inline pte_t pte_mkhuge(pte_t pte)
	240	{
	241	return __pte(pte_val(pte) \| _PAGE_PSE);
	242	}
	243
	244	static inline pte_t pte_clrhuge(pte_t pte)
	245	{
	246	return __pte(pte_val(pte) & ~(pteval_t)_PAGE_PSE);
	247	}
	248
	249	static inline pte_t pte_mkglobal(pte_t pte)
	250	{
	251	return __pte(pte_val(pte) \| _PAGE_GLOBAL);
252	}
253
254	static inline pte_t pte_clrglobal(pte_t pte)
255	{
256	return __pte(pte_val(pte) & ~(pteval_t)_PAGE_GLOBAL);
257	}
4614139c	258
6fdc05d4 JF	259	extern pteval_t __supported_pte_mask;
	260
	261	static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
	262	{
	263	return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	264	pgprot_val(pgprot)) & __supported_pte_mask);
	265	}
	266
	267	static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
	268	{
	269	return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) \|
	270	pgprot_val(pgprot)) & __supported_pte_mask);
	271	}
	272
38472311 IM	273	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	274	{
	275	pteval_t val = pte_val(pte);
	276
	277	/*
	278	* Chop off the NX bit (if present), and add the NX portion of
	279	* the newprot (if present):
	280	*/
	281	val &= _PAGE_CHG_MASK & ~_PAGE_NX;
	282	val \|= pgprot_val(newprot) & __supported_pte_mask;
	283
	284	return __pte(val);
	285	}
	286
c6ca18eb AK	287	#define pte_pgprot(x) __pgprot(pte_val(x) & (0xfff \| _PAGE_NX))
c6ca18eb AK	288
1e8e23bc AK	289	#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
1e8e23bc AK	290
f0970c13	291	#ifndef __ASSEMBLY__
	292	#define __HAVE_PHYS_MEM_ACCESS_PROT
	293	struct file;
	294	pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
	295	unsigned long size, pgprot_t vma_prot);
	296	int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
	297	unsigned long size, pgprot_t *vma_prot);
	298	#endif
	299
4891645e JF	300	#ifdef CONFIG_PARAVIRT
	301	#include <asm/paravirt.h>
	302	#else /* !CONFIG_PARAVIRT */
	303	#define set_pte(ptep, pte) native_set_pte(ptep, pte)
	304	#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
	305
	306	#define set_pte_present(mm, addr, ptep, pte) \
	307	native_set_pte_present(mm, addr, ptep, pte)
	308	#define set_pte_atomic(ptep, pte) \
	309	native_set_pte_atomic(ptep, pte)
	310
	311	#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
	312
	313	#ifndef __PAGETABLE_PUD_FOLDED
	314	#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
	315	#define pgd_clear(pgd) native_pgd_clear(pgd)
	316	#endif
	317
	318	#ifndef set_pud
	319	# define set_pud(pudp, pud) native_set_pud(pudp, pud)
	320	#endif
	321
	322	#ifndef __PAGETABLE_PMD_FOLDED
	323	#define pud_clear(pud) native_pud_clear(pud)
	324	#endif
	325
	326	#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
	327	#define pmd_clear(pmd) native_pmd_clear(pmd)
	328
	329	#define pte_update(mm, addr, ptep) do { } while (0)
	330	#define pte_update_defer(mm, addr, ptep) do { } while (0)
	331	#endif /* CONFIG_PARAVIRT */
	332
4614139c JF	333	#endif /* __ASSEMBLY__ */
4614139c JF	334
96a388de TG	335	#ifdef CONFIG_X86_32
	336	# include "pgtable_32.h"
	337	#else
	338	# include "pgtable_64.h"
	339	#endif
6c386655	340
68db065c JF	341	#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
	342	#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
	343
195466dc JF	344	#ifndef __ASSEMBLY__
195466dc JF	345
30551bb3 TG	346	enum {
	347	PG_LEVEL_NONE,
	348	PG_LEVEL_4K,
	349	PG_LEVEL_2M,
86f03989	350	PG_LEVEL_1G,
30551bb3 TG	351	};
30551bb3 TG	352
0a663088 TG	353	/*
	354	* Helper function that returns the kernel pagetable entry controlling
	355	* the virtual address 'address'. NULL means no pagetable entry present.
	356	* NOTE: the return type is pte_t but if the pmd is PSE then we return it
	357	* as a pte too.
	358	*/
da7bfc50	359	extern pte_t lookup_address(unsigned long address, unsigned int level);
0a663088	360
4891645e JF	361	/* local pte updates need not use xchg for locking */
	362	static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
	363	{
	364	pte_t res = *ptep;
	365
	366	/* Pure native function needs no input for mm, addr */
	367	native_pte_clear(NULL, 0, ptep);
	368	return res;
	369	}
	370
	371	static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
	372	pte_t *ptep , pte_t pte)
	373	{
	374	native_set_pte(ptep, pte);
	375	}
	376
195466dc JF	377	#ifndef CONFIG_PARAVIRT
	378	/*
	379	* Rules for using pte_update - it must be called after any PTE update which
	380	* has not been done using the set_pte / clear_pte interfaces. It is used by
	381	* shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
	382	* updates should either be sets, clears, or set_pte_atomic for P->P
	383	* transitions, which means this hook should only be called for user PTEs.
	384	* This hook implies a P->P protection or access change has taken place, which
	385	* requires a subsequent TLB flush. The notification can optionally be delayed
	386	* until the TLB flush event by using the pte_update_defer form of the
	387	* interface, but care must be taken to assure that the flush happens while
	388	* still holding the same page table lock so that the shadow and primary pages
	389	* do not become out of sync on SMP.
	390	*/
	391	#define pte_update(mm, addr, ptep) do { } while (0)
	392	#define pte_update_defer(mm, addr, ptep) do { } while (0)
	393	#endif
	394
195466dc JF	395	/*
	396	* We only update the dirty/accessed state if we set
	397	* the dirty bit by hand in the kernel, since the hardware
	398	* will do the accessed bit for us, and we don't want to
	399	* race with other CPU's that might be updating the dirty
	400	* bit at the same time.
	401	*/
	402	#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
ee5aa8d3 JF	403	extern int ptep_set_access_flags(struct vm_area_struct *vma,
	404	unsigned long address, pte_t *ptep,
	405	pte_t entry, int dirty);
195466dc JF	406
195466dc JF	407	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
f9fbf1a3 JF	408	extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
f9fbf1a3 JF	409	unsigned long addr, pte_t *ptep);
195466dc JF	410
195466dc JF	411	#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
c20311e1 JF	412	extern int ptep_clear_flush_young(struct vm_area_struct *vma,
c20311e1 JF	413	unsigned long address, pte_t *ptep);
195466dc JF	414
195466dc JF	415	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
3cbaeafe JP	416	static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
3cbaeafe JP	417	pte_t *ptep)
195466dc JF	418	{
	419	pte_t pte = native_ptep_get_and_clear(ptep);
	420	pte_update(mm, addr, ptep);
	421	return pte;
	422	}
	423
	424	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
3cbaeafe JP	425	static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
	426	unsigned long addr, pte_t *ptep,
	427	int full)
195466dc JF	428	{
	429	pte_t pte;
	430	if (full) {
	431	/*
	432	* Full address destruction in progress; paravirt does not
	433	* care about updates and native needs no locking
	434	*/
	435	pte = native_local_ptep_get_and_clear(ptep);
	436	} else {
	437	pte = ptep_get_and_clear(mm, addr, ptep);
	438	}
	439	return pte;
	440	}
	441
	442	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
3cbaeafe JP	443	static inline void ptep_set_wrprotect(struct mm_struct *mm,
3cbaeafe JP	444	unsigned long addr, pte_t *ptep)
195466dc	445	{
d8d89827	446	clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
195466dc JF	447	pte_update(mm, addr, ptep);
	448	}
	449
85958b46 JF	450	/*
	451	* clone_pgd_range(pgd_t dst, pgd_t src, int count);
	452	*
	453	* dst - pointer to pgd range anwhere on a pgd page
	454	* src - ""
	455	* count - the number of pgds to copy.
	456	*
	457	* dst and src can be on the same page, but the range must not overlap,
	458	* and must not cross a page boundary.
	459	*/
	460	static inline void clone_pgd_range(pgd_t dst, pgd_t src, int count)
	461	{
	462	memcpy(dst, src, count * sizeof(pgd_t));
	463	}
	464
	465
195466dc JF	466	#include <asm-generic/pgtable.h>
	467	#endif /* __ASSEMBLY__ */
	468
6c386655	469	#endif /* _ASM_X86_PGTABLE_H */