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 pte_t level1_fixmap_pgt[512];
  23extern pgd_t init_level4_pgt[];
  24
  25#define swapper_pg_dir init_level4_pgt
  26
  27extern void paging_init(void);
  28
  29#define pte_ERROR(e)                                    \
  30        pr_err("%s:%d: bad pte %p(%016lx)\n",           \
  31               __FILE__, __LINE__, &(e), pte_val(e))
  32#define pmd_ERROR(e)                                    \
  33        pr_err("%s:%d: bad pmd %p(%016lx)\n",           \
  34               __FILE__, __LINE__, &(e), pmd_val(e))
  35#define pud_ERROR(e)                                    \
  36        pr_err("%s:%d: bad pud %p(%016lx)\n",           \
  37               __FILE__, __LINE__, &(e), pud_val(e))
  38#define pgd_ERROR(e)                                    \
  39        pr_err("%s:%d: bad pgd %p(%016lx)\n",           \
  40               __FILE__, __LINE__, &(e), pgd_val(e))
  41
  42struct mm_struct;
  43
  44void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  45
  46
  47static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  48                                    pte_t *ptep)
  49{
  50        *ptep = native_make_pte(0);
  51}
  52
  53static inline void native_set_pte(pte_t *ptep, pte_t pte)
  54{
  55        *ptep = pte;
  56}
  57
  58static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  59{
  60        native_set_pte(ptep, pte);
  61}
  62
  63static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  64{
  65        *pmdp = pmd;
  66}
  67
  68static inline void native_pmd_clear(pmd_t *pmd)
  69{
  70        native_set_pmd(pmd, native_make_pmd(0));
  71}
  72
  73static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  74{
  75#ifdef CONFIG_SMP
  76        return native_make_pte(xchg(&xp->pte, 0));
  77#else
  78        /* native_local_ptep_get_and_clear,
  79           but duplicated because of cyclic dependency */
  80        pte_t ret = *xp;
  81        native_pte_clear(NULL, 0, xp);
  82        return ret;
  83#endif
  84}
  85
  86static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
  87{
  88#ifdef CONFIG_SMP
  89        return native_make_pmd(xchg(&xp->pmd, 0));
  90#else
  91        /* native_local_pmdp_get_and_clear,
  92           but duplicated because of cyclic dependency */
  93        pmd_t ret = *xp;
  94        native_pmd_clear(xp);
  95        return ret;
  96#endif
  97}
  98
  99static inline void native_set_pud(pud_t *pudp, pud_t pud)
 100{
 101        *pudp = pud;
 102}
 103
 104static inline void native_pud_clear(pud_t *pud)
 105{
 106        native_set_pud(pud, native_make_pud(0));
 107}
 108
 109static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 110{
 111        *pgdp = pgd;
 112}
 113
 114static inline void native_pgd_clear(pgd_t *pgd)
 115{
 116        native_set_pgd(pgd, native_make_pgd(0));
 117}
 118
 119extern void sync_global_pgds(unsigned long start, unsigned long end,
 120                             int removed);
 121
 122/*
 123 * Conversion functions: convert a page and protection to a page entry,
 124 * and a page entry and page directory to the page they refer to.
 125 */
 126
 127/*
 128 * Level 4 access.
 129 */
 130static inline int pgd_large(pgd_t pgd) { return 0; }
 131#define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 132
 133/* PUD - Level3 access */
 134
 135/* PMD  - Level 2 access */
 136#define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 137#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) |     \
 138                                            _PAGE_FILE })
 139#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 140
 141/* PTE - Level 1 access. */
 142
 143/* x86-64 always has all page tables mapped. */
 144#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 145#define pte_unmap(pte) ((void)(pte))/* NOP */
 146
 147/* Encode and de-code a swap entry */
 148#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
 149#ifdef CONFIG_NUMA_BALANCING
 150/* Automatic NUMA balancing needs to be distinguishable from swap entries */
 151#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 2)
 152#else
 153#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
 154#endif
 155
 156#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 157
 158#define __swp_type(x)                   (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
 159                                         & ((1U << SWP_TYPE_BITS) - 1))
 160#define __swp_offset(x)                 ((x).val >> SWP_OFFSET_SHIFT)
 161#define __swp_entry(type, offset)       ((swp_entry_t) { \
 162                                         ((type) << (_PAGE_BIT_PRESENT + 1)) \
 163                                         | ((offset) << SWP_OFFSET_SHIFT) })
 164#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 165#define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 166
 167extern int kern_addr_valid(unsigned long addr);
 168extern void cleanup_highmap(void);
 169
 170#define HAVE_ARCH_UNMAPPED_AREA
 171#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 172
 173#define pgtable_cache_init()   do { } while (0)
 174#define check_pgt_cache()      do { } while (0)
 175
 176#define PAGE_AGP    PAGE_KERNEL_NOCACHE
 177#define HAVE_PAGE_AGP 1
 178
 179/* fs/proc/kcore.c */
 180#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 181#define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
 182
 183#define __HAVE_ARCH_PTE_SAME
 184
 185#define vmemmap ((struct page *)VMEMMAP_START)
 186
 187extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
 188extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
 189
 190#endif /* !__ASSEMBLY__ */
 191
 192#endif /* _ASM_X86_PGTABLE_64_H */
 193