LXR linux/arch/x86/include/asm/pgtable

   1#ifndef _ASM_X86_PGTABLE_64_H
   2#define _ASM_X86_PGTABLE_64_H
   3
   4#include <linux/const.h>
   5#include <asm/pgtable_64_types.h>
   6
   7#ifndef __ASSEMBLY__
   8
   9/*
  10 * This file contains the functions and defines necessary to modify and use
  11 * the x86-64 page table tree.
  12 */
  13#include <asm/processor.h>
  14#include <linux/bitops.h>
  15#include <linux/threads.h>
  16
  17extern pud_t level3_kernel_pgt[512];
  18extern pud_t level3_ident_pgt[512];
  19extern pmd_t level2_kernel_pgt[512];
  20extern pmd_t level2_fixmap_pgt[512];
  21extern pmd_t level2_ident_pgt[512];
  22extern pgd_t init_level4_pgt[];
  23
  24#define swapper_pg_dir init_level4_pgt
  25
  26extern void paging_init(void);
  27
  28#define pte_ERROR(e)                                    \
  29        pr_err("%s:%d: bad pte %p(%016lx)\n",           \
  30               __FILE__, __LINE__, &(e), pte_val(e))
  31#define pmd_ERROR(e)                                    \
  32        pr_err("%s:%d: bad pmd %p(%016lx)\n",           \
  33               __FILE__, __LINE__, &(e), pmd_val(e))
  34#define pud_ERROR(e)                                    \
  35        pr_err("%s:%d: bad pud %p(%016lx)\n",           \
  36               __FILE__, __LINE__, &(e), pud_val(e))
  37#define pgd_ERROR(e)                                    \
  38        pr_err("%s:%d: bad pgd %p(%016lx)\n",           \
  39               __FILE__, __LINE__, &(e), pgd_val(e))
  40
  41struct mm_struct;
  42
  43void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  44
  45
  46static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  47                                    pte_t *ptep)
  48{
  49        *ptep = native_make_pte(0);
  50}
  51
  52static inline void native_set_pte(pte_t *ptep, pte_t pte)
  53{
  54        *ptep = pte;
  55}
  56
  57static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  58{
  59        native_set_pte(ptep, pte);
  60}
  61
  62static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  63{
  64        *pmdp = pmd;
  65}
  66
  67static inline void native_pmd_clear(pmd_t *pmd)
  68{
  69        native_set_pmd(pmd, native_make_pmd(0));
  70}
  71
  72static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  73{
  74#ifdef CONFIG_SMP
  75        return native_make_pte(xchg(&xp->pte, 0));
  76#else
  77        /* native_local_ptep_get_and_clear,
  78           but duplicated because of cyclic dependency */
  79        pte_t ret = *xp;
  80        native_pte_clear(NULL, 0, xp);
  81        return ret;
  82#endif
  83}
  84
  85static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
  86{
  87#ifdef CONFIG_SMP
  88        return native_make_pmd(xchg(&xp->pmd, 0));
  89#else
  90        /* native_local_pmdp_get_and_clear,
  91           but duplicated because of cyclic dependency */
  92        pmd_t ret = *xp;
  93        native_pmd_clear(xp);
  94        return ret;
  95#endif
  96}
  97
  98static inline void native_set_pud(pud_t *pudp, pud_t pud)
  99{
 100        *pudp = pud;
 101}
 102
 103static inline void native_pud_clear(pud_t *pud)
 104{
 105        native_set_pud(pud, native_make_pud(0));
 106}
 107
 108static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 109{
 110        *pgdp = pgd;
 111}
 112
 113static inline void native_pgd_clear(pgd_t *pgd)
 114{
 115        native_set_pgd(pgd, native_make_pgd(0));
 116}
 117
 118extern void sync_global_pgds(unsigned long start, unsigned long end);
 119
 120/*
 121 * Conversion functions: convert a page and protection to a page entry,
 122 * and a page entry and page directory to the page they refer to.
 123 */
 124
 125/*
 126 * Level 4 access.
 127 */
 128static inline int pgd_large(pgd_t pgd) { return 0; }
 129#define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 130
 131/* PUD - Level3 access */
 132
 133/* PMD  - Level 2 access */
 134#define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 135#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) |     \
 136                                            _PAGE_FILE })
 137#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 138
 139/* PTE - Level 1 access. */
 140
 141/* x86-64 always has all page tables mapped. */
 142#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 143#define pte_unmap(pte) ((void)(pte))/* NOP */
 144
 145/* Encode and de-code a swap entry */
 146#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
 147#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
 148#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
 149#else
 150#define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
 151#define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
 152#endif
 153
 154#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 155
 156#define __swp_type(x)                   (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
 157                                         & ((1U << SWP_TYPE_BITS) - 1))
 158#define __swp_offset(x)                 ((x).val >> SWP_OFFSET_SHIFT)
 159#define __swp_entry(type, offset)       ((swp_entry_t) { \
 160                                         ((type) << (_PAGE_BIT_PRESENT + 1)) \
 161                                         | ((offset) << SWP_OFFSET_SHIFT) })
 162#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 163#define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 164
 165extern int kern_addr_valid(unsigned long addr);
 166extern void cleanup_highmap(void);
 167
 168#define HAVE_ARCH_UNMAPPED_AREA
 169#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 170
 171#define pgtable_cache_init()   do { } while (0)
 172#define check_pgt_cache()      do { } while (0)
 173
 174#define PAGE_AGP    PAGE_KERNEL_NOCACHE
 175#define HAVE_PAGE_AGP 1
 176
 177/* fs/proc/kcore.c */
 178#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 179#define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
 180
 181#define __HAVE_ARCH_PTE_SAME
 182
 183#define vmemmap ((struct page *)VMEMMAP_START)
 184
 185extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
 186extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
 187
 188#endif /* !__ASSEMBLY__ */
 189
 190#endif /* _ASM_X86_PGTABLE_64_H */
 191