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 #ifndef __ASSEMBLY__
   6
   7 /*
   8  * This file contains the functions and defines necessary to modify and use
   9  * the x86-64 page table tree.
  10  */
  11 #include <asm/processor.h>
  12 #include <linux/bitops.h>
  13 #include <linux/threads.h>
  14
  15 extern pud_t level3_kernel_pgt[512];
  16 extern pud_t level3_ident_pgt[512];
  17 extern pmd_t level2_kernel_pgt[512];
  18 extern pmd_t level2_fixmap_pgt[512];
  19 extern pmd_t level2_ident_pgt[512];
  20 extern pgd_t init_level4_pgt[];
  21
  22 #define swapper_pg_dir init_level4_pgt
  23
  24 extern void paging_init(void);
  25
  26 #endif /* !__ASSEMBLY__ */
  27
  28 #define SHARED_KERNEL_PMD       0
  29
  30 /*
  31  * PGDIR_SHIFT determines what a top-level page table entry can map
  32  */
  33 #define PGDIR_SHIFT     39
  34 #define PTRS_PER_PGD    512
  35
  36 /*
  37  * 3rd level page
  38  */
  39 #define PUD_SHIFT       30
  40 #define PTRS_PER_PUD    512
  41
  42 /*
  43  * PMD_SHIFT determines the size of the area a middle-level
  44  * page table can map
  45  */
  46 #define PMD_SHIFT       21
  47 #define PTRS_PER_PMD    512
  48
  49 /*
  50  * entries per page directory level
  51  */
  52 #define PTRS_PER_PTE    512
  53
  54 #ifndef __ASSEMBLY__
  55
  56 #define pte_ERROR(e)                                    \
  57         printk("%s:%d: bad pte %p(%016lx).\n",          \
  58                __FILE__, __LINE__, &(e), pte_val(e))
  59 #define pmd_ERROR(e)                                    \
  60         printk("%s:%d: bad pmd %p(%016lx).\n",          \
  61                __FILE__, __LINE__, &(e), pmd_val(e))
  62 #define pud_ERROR(e)                                    \
  63         printk("%s:%d: bad pud %p(%016lx).\n",          \
  64                __FILE__, __LINE__, &(e), pud_val(e))
  65 #define pgd_ERROR(e)                                    \
  66         printk("%s:%d: bad pgd %p(%016lx).\n",          \
  67                __FILE__, __LINE__, &(e), pgd_val(e))
  68
  69 struct mm_struct;
  70
  71 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  72
  73
  74 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  75                                     pte_t *ptep)
  76 {
  77         *ptep = native_make_pte(0);
  78 }
  79
  80 static inline void native_set_pte(pte_t *ptep, pte_t pte)
  81 {
  82         *ptep = pte;
  83 }
  84
  85 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  86 {
  87         native_set_pte(ptep, pte);
  88 }
  89
  90 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  91 {
  92 #ifdef CONFIG_SMP
  93         return native_make_pte(xchg(&xp->pte, 0));
  94 #else
  95         /* native_local_ptep_get_and_clear,
  96            but duplicated because of cyclic dependency */
  97         pte_t ret = *xp;
  98         native_pte_clear(NULL, 0, xp);
  99         return ret;
 100 #endif
 101 }
 102
 103 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 104 {
 105         *pmdp = pmd;
 106 }
 107
 108 static inline void native_pmd_clear(pmd_t *pmd)
 109 {
 110         native_set_pmd(pmd, native_make_pmd(0));
 111 }
 112
 113 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 114 {
 115         *pudp = pud;
 116 }
 117
 118 static inline void native_pud_clear(pud_t *pud)
 119 {
 120         native_set_pud(pud, native_make_pud(0));
 121 }
 122
 123 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 124 {
 125         *pgdp = pgd;
 126 }
 127
 128 static inline void native_pgd_clear(pgd_t *pgd)
 129 {
 130         native_set_pgd(pgd, native_make_pgd(0));
 131 }
 132
 133 #endif /* !__ASSEMBLY__ */
 134
 135 #define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
 136 #define PMD_MASK        (~(PMD_SIZE - 1))
 137 #define PUD_SIZE        (_AC(1, UL) << PUD_SHIFT)
 138 #define PUD_MASK        (~(PUD_SIZE - 1))
 139 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
 140 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
 141
 142
 143 #define MAXMEM           _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
 144 #define VMALLOC_START    _AC(0xffffc20000000000, UL)
 145 #define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)
 146 #define VMEMMAP_START    _AC(0xffffe20000000000, UL)
 147 #define MODULES_VADDR    _AC(0xffffffffa0000000, UL)
 148 #define MODULES_END      _AC(0xffffffffff000000, UL)
 149 #define MODULES_LEN   (MODULES_END - MODULES_VADDR)
 150
 151 #ifndef __ASSEMBLY__
 152
 153 /*
 154  * Conversion functions: convert a page and protection to a page entry,
 155  * and a page entry and page directory to the page they refer to.
 156  */
 157
 158 /*
 159  * Level 4 access.
 160  */
 161 static inline int pgd_large(pgd_t pgd) { return 0; }
 162 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 163
 164 /* PUD - Level3 access */
 165
 166 /* PMD  - Level 2 access */
 167 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 168 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) |     \
 169                                             _PAGE_FILE })
 170 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 171
 172 /* PTE - Level 1 access. */
 173
 174 /* x86-64 always has all page tables mapped. */
 175 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 176 #define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
 177 #define pte_unmap(pte) /* NOP */
 178 #define pte_unmap_nested(pte) /* NOP */
 179
 180 #define update_mmu_cache(vma, address, pte) do { } while (0)
 181
 182 extern int direct_gbpages;
 183
 184 /* Encode and de-code a swap entry */
 185 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
 186 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
 187 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
 188 #else
 189 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
 190 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
 191 #endif
 192
 193 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 194
 195 #define __swp_type(x)                   (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
 196                                          & ((1U << SWP_TYPE_BITS) - 1))
 197 #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_SHIFT)
 198 #define __swp_entry(type, offset)       ((swp_entry_t) { \
 199                                          ((type) << (_PAGE_BIT_PRESENT + 1)) \
 200                                          | ((offset) << SWP_OFFSET_SHIFT) })
 201 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 202 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 203
 204 extern int kern_addr_valid(unsigned long addr);
 205 extern void cleanup_highmap(void);
 206
 207 #define HAVE_ARCH_UNMAPPED_AREA
 208 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 209
 210 #define pgtable_cache_init()   do { } while (0)
 211 #define check_pgt_cache()      do { } while (0)
 212
 213 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 214 #define HAVE_PAGE_AGP 1
 215
 216 /* fs/proc/kcore.c */
 217 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 218 #define kc_offset_to_vaddr(o)                           \
 219         (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1)))    \
 220          ? ((o) | ~__VIRTUAL_MASK)                      \
 221          : (o))
 222
 223 #define __HAVE_ARCH_PTE_SAME
 224 #endif /* !__ASSEMBLY__ */
 225
 226 #endif /* _ASM_X86_PGTABLE_64_H */