arch/x86/include/asm/pgtable

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
native_make_pgd
native_pgd_val
pgd_flags
native_make_pud
native_pud_val
native_pud_val
native_make_pmd
native_pmd_val
native_pmd_val
pud_flags
pmd_flags
native_make_pte
native_pte_val
pte_flags
ptenuma_flags
pmdnuma_flags
update_page_count
#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      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_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_SPECIAL       _PAGE_BIT_SOFTW1
#define _PAGE_BIT_CPA_TEST      _PAGE_BIT_SOFTW1
#define _PAGE_BIT_SPLITTING     _PAGE_BIT_SOFTW2 /* only valid on a PSE pmd */
#define _PAGE_BIT_HIDDEN        _PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
#define _PAGE_BIT_SOFT_DIRTY    _PAGE_BIT_SOFTW3 /* software dirty tracking */
#define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */

/*
 * Swap offsets on configurations that allow automatic NUMA balancing use the
 * bits after _PAGE_BIT_GLOBAL. To uniquely distinguish NUMA hinting PTEs from
 * swap entries, we use the first bit after _PAGE_BIT_GLOBAL and shrink the
 * maximum possible swap space from 16TB to 8TB.
 */
#define _PAGE_BIT_NUMA          (_PAGE_BIT_GLOBAL+1)

/* 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
/* - set: nonlinear file mapping, saved PTE; unset:swap */
#define _PAGE_BIT_FILE          _PAGE_BIT_DIRTY

#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)
#define _PAGE_SPLITTING (_AT(pteval_t, 1) << _PAGE_BIT_SPLITTING)
#define __HAVE_ARCH_PTE_SPECIAL

#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

/*
 * _PAGE_NUMA distinguishes between a numa hinting minor fault and a page
 * that is not present. The hinting fault gathers numa placement statistics
 * (see pte_numa()). The bit is always zero when the PTE is not present.
 *
 * The bit picked must be always zero when the pmd is present and not
 * present, so that we don't lose information when we set it while
 * atomically clearing the present bit.
 */
#ifdef CONFIG_NUMA_BALANCING
#define _PAGE_NUMA      (_AT(pteval_t, 1) << _PAGE_BIT_NUMA)
#else
#define _PAGE_NUMA      (_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)
#else
#define _PAGE_NX        (_AT(pteval_t, 0))
#endif

#define _PAGE_FILE      (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
#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 */
#define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
                         _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
                         _PAGE_SOFT_DIRTY | _PAGE_NUMA)
#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE | _PAGE_NUMA)

#define _PAGE_CACHE_MASK        (_PAGE_PCD | _PAGE_PWT)
#define _PAGE_CACHE_WB          (0)
#define _PAGE_CACHE_WC          (_PAGE_PWT)
#define _PAGE_CACHE_UC_MINUS    (_PAGE_PCD)
#define _PAGE_CACHE_UC          (_PAGE_PCD | _PAGE_PWT)

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

#define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
                                         _PAGE_USER | _PAGE_ACCESSED)
#define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
                                         _PAGE_ACCESSED | _PAGE_NX)
#define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
                                         _PAGE_ACCESSED)
#define PAGE_COPY               PAGE_COPY_NOEXEC
#define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
                                         _PAGE_ACCESSED | _PAGE_NX)
#define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
                                         _PAGE_ACCESSED)

#define __PAGE_KERNEL_EXEC                                              \
        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
#define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)

#define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
#define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
#define __PAGE_KERNEL_EXEC_NOCACHE      (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
#define __PAGE_KERNEL_WC                (__PAGE_KERNEL | _PAGE_CACHE_WC)
#define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
#define __PAGE_KERNEL_UC_MINUS          (__PAGE_KERNEL | _PAGE_PCD)
#define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
#define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
#define __PAGE_KERNEL_VVAR_NOCACHE      (__PAGE_KERNEL_VVAR | _PAGE_PCD | _PAGE_PWT)
#define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
#define __PAGE_KERNEL_LARGE_NOCACHE     (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
#define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)

#define __PAGE_KERNEL_IO                (__PAGE_KERNEL)
#define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE)
#define __PAGE_KERNEL_IO_UC_MINUS       (__PAGE_KERNEL_UC_MINUS)
#define __PAGE_KERNEL_IO_WC             (__PAGE_KERNEL_WC)

#define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
#define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
#define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
#define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
#define PAGE_KERNEL_WC                  __pgprot(__PAGE_KERNEL_WC)
#define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
#define PAGE_KERNEL_UC_MINUS            __pgprot(__PAGE_KERNEL_UC_MINUS)
#define PAGE_KERNEL_EXEC_NOCACHE        __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
#define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
#define PAGE_KERNEL_LARGE_NOCACHE       __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
#define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
#define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
#define PAGE_KERNEL_VVAR                __pgprot(__PAGE_KERNEL_VVAR)
#define PAGE_KERNEL_VVAR_NOCACHE        __pgprot(__PAGE_KERNEL_VVAR_NOCACHE)

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

/*         xwr */
#define __P000  PAGE_NONE
#define __P001  PAGE_READONLY
#define __P010  PAGE_COPY
#define __P011  PAGE_COPY
#define __P100  PAGE_READONLY_EXEC
#define __P101  PAGE_READONLY_EXEC
#define __P110  PAGE_COPY_EXEC
#define __P111  PAGE_COPY_EXEC

#define __S000  PAGE_NONE
#define __S001  PAGE_READONLY
#define __S010  PAGE_SHARED
#define __S011  PAGE_SHARED
#define __S100  PAGE_READONLY_EXEC
#define __S101  PAGE_READONLY_EXEC
#define __S110  PAGE_SHARED_EXEC
#define __S111  PAGE_SHARED_EXEC

/*
 * early identity mapping  pte attrib macros.
 */
#ifdef CONFIG_X86_64
#define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
#else
#define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
#define PDE_IDENT_ATTR   0x063          /* PRESENT+RW+DIRTY+ACCESSED */
#define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
#endif

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

#ifndef __ASSEMBLY__

#include <linux/types.h>

/* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
#define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)

/* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
#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 PAGETABLE_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 PAGETABLE_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_flags(pud_t pud)
{
        return native_pud_val(pud) & PTE_FLAGS_MASK;
}

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

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;
}

#ifdef CONFIG_NUMA_BALANCING
/* Set of bits that distinguishes present, prot_none and numa ptes */
#define _PAGE_NUMA_MASK (_PAGE_NUMA|_PAGE_PROTNONE|_PAGE_PRESENT)
static inline pteval_t ptenuma_flags(pte_t pte)
{
        return pte_flags(pte) & _PAGE_NUMA_MASK;
}

static inline pmdval_t pmdnuma_flags(pmd_t pmd)
{
        return pmd_flags(pmd) & _PAGE_NUMA_MASK;
}
#endif /* CONFIG_NUMA_BALANCING */

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


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);

/* 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 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);
void kernel_unmap_pages_in_pgd(pgd_t *root, unsigned long address,
                               unsigned numpages);
#endif  /* !__ASSEMBLY__ */

#endif /* _ASM_X86_PGTABLE_DEFS_H */
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root/arch/x86/include/asm/pgtable_types.h

INCLUDED FROM

DEFINITIONS
