arch/x86/include/asm/pgtable_64.h

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