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