include/asm-x86/pgtable_64.h

   1 #ifndef _X86_64_PGTABLE_H
   2 #define _X86_64_PGTABLE_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 #include <asm/pda.h>
  15
  16 extern pud_t level3_kernel_pgt[512];
  17 extern pud_t level3_ident_pgt[512];
  18 extern pmd_t level2_kernel_pgt[512];
  19 extern pgd_t init_level4_pgt[];
  20
  21 #define swapper_pg_dir init_level4_pgt
  22
  23 extern void paging_init(void);
  24
  25 #endif /* !__ASSEMBLY__ */
  26
  27 #define SHARED_KERNEL_PMD       0
  28
  29 /*
  30  * PGDIR_SHIFT determines what a top-level page table entry can map
  31  */
  32 #define PGDIR_SHIFT     39
  33 #define PTRS_PER_PGD    512
  34
  35 /*
  36  * 3rd level page
  37  */
  38 #define PUD_SHIFT       30
  39 #define PTRS_PER_PUD    512
  40
  41 /*
  42  * PMD_SHIFT determines the size of the area a middle-level
  43  * page table can map
  44  */
  45 #define PMD_SHIFT       21
  46 #define PTRS_PER_PMD    512
  47
  48 /*
  49  * entries per page directory level
  50  */
  51 #define PTRS_PER_PTE    512
  52
  53 #ifndef __ASSEMBLY__
  54
  55 #define pte_ERROR(e)                                    \
  56         printk("%s:%d: bad pte %p(%016lx).\n",          \
  57                __FILE__, __LINE__, &(e), pte_val(e))
  58 #define pmd_ERROR(e)                                    \
  59         printk("%s:%d: bad pmd %p(%016lx).\n",          \
  60                __FILE__, __LINE__, &(e), pmd_val(e))
  61 #define pud_ERROR(e)                                    \
  62         printk("%s:%d: bad pud %p(%016lx).\n",          \
  63                __FILE__, __LINE__, &(e), pud_val(e))
  64 #define pgd_ERROR(e)                                    \
  65         printk("%s:%d: bad pgd %p(%016lx).\n",          \
  66                __FILE__, __LINE__, &(e), pgd_val(e))
  67
  68 #define pgd_none(x)     (!pgd_val(x))
  69 #define pud_none(x)     (!pud_val(x))
  70
  71 struct mm_struct;
  72
  73 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  74
  75
  76 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  77                                     pte_t *ptep)
  78 {
  79         *ptep = native_make_pte(0);
  80 }
  81
  82 static inline void native_set_pte(pte_t *ptep, pte_t pte)
  83 {
  84         *ptep = pte;
  85 }
  86
  87 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  88 {
  89         native_set_pte(ptep, pte);
  90 }
  91
  92 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  93 {
  94 #ifdef CONFIG_SMP
  95         return native_make_pte(xchg(&xp->pte, 0));
  96 #else
  97         /* native_local_ptep_get_and_clear,
  98            but duplicated because of cyclic dependency */
  99         pte_t ret = *xp;
 100         native_pte_clear(NULL, 0, xp);
 101         return ret;
 102 #endif
 103 }
 104
 105 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 106 {
 107         *pmdp = pmd;
 108 }
 109
 110 static inline void native_pmd_clear(pmd_t *pmd)
 111 {
 112         native_set_pmd(pmd, native_make_pmd(0));
 113 }
 114
 115 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 116 {
 117         *pudp = pud;
 118 }
 119
 120 static inline void native_pud_clear(pud_t *pud)
 121 {
 122         native_set_pud(pud, native_make_pud(0));
 123 }
 124
 125 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 126 {
 127         *pgdp = pgd;
 128 }
 129
 130 static inline void native_pgd_clear(pgd_t *pgd)
 131 {
 132         native_set_pgd(pgd, native_make_pgd(0));
 133 }
 134
 135 #define pte_same(a, b)          ((a).pte == (b).pte)
 136
 137 #endif /* !__ASSEMBLY__ */
 138
 139 #define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
 140 #define PMD_MASK        (~(PMD_SIZE - 1))
 141 #define PUD_SIZE        (_AC(1, UL) << PUD_SHIFT)
 142 #define PUD_MASK        (~(PUD_SIZE - 1))
 143 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
 144 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
 145
 146
 147 #define MAXMEM           _AC(0x00003fffffffffff, UL)
 148 #define VMALLOC_START    _AC(0xffffc20000000000, UL)
 149 #define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)
 150 #define VMEMMAP_START    _AC(0xffffe20000000000, UL)
 151 #define MODULES_VADDR    _AC(0xffffffffa0000000, UL)
 152 #define MODULES_END      _AC(0xfffffffffff00000, UL)
 153 #define MODULES_LEN   (MODULES_END - MODULES_VADDR)
 154
 155 #ifndef __ASSEMBLY__
 156
 157 static inline int pgd_bad(pgd_t pgd)
 158 {
 159         return (pgd_val(pgd) & ~(PTE_MASK | _PAGE_USER)) != _KERNPG_TABLE;
 160 }
 161
 162 static inline int pud_bad(pud_t pud)
 163 {
 164         return (pud_val(pud) & ~(PTE_MASK | _PAGE_USER)) != _KERNPG_TABLE;
 165 }
 166
 167 static inline int pmd_bad(pmd_t pmd)
 168 {
 169         return (pmd_val(pmd) & ~(PTE_MASK | _PAGE_USER)) != _KERNPG_TABLE;
 170 }
 171
 172 #define pte_none(x)     (!pte_val((x)))
 173 #define pte_present(x)  (pte_val((x)) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 174
 175 #define pages_to_mb(x)  ((x) >> (20 - PAGE_SHIFT))   /* FIXME: is this right? */
 176 #define pte_page(x)     pfn_to_page(pte_pfn((x)))
 177 #define pte_pfn(x)      ((pte_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 178
 179 /*
 180  * Macro to mark a page protection value as "uncacheable".
 181  */
 182 #define pgprot_noncached(prot)                                  \
 183         (__pgprot(pgprot_val((prot)) | _PAGE_PCD | _PAGE_PWT))
 184
 185 /*
 186  * Conversion functions: convert a page and protection to a page entry,
 187  * and a page entry and page directory to the page they refer to.
 188  */
 189
 190 /*
 191  * Level 4 access.
 192  */
 193 #define pgd_page_vaddr(pgd)                                             \
 194         ((unsigned long)__va((unsigned long)pgd_val((pgd)) & PTE_MASK))
 195 #define pgd_page(pgd)           (pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
 196 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
 197 static inline int pgd_large(pgd_t pgd) { return 0; }
 198 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 199
 200 /* PUD - Level3 access */
 201 /* to find an entry in a page-table-directory. */
 202 #define pud_page_vaddr(pud)                                             \
 203         ((unsigned long)__va(pud_val((pud)) & PHYSICAL_PAGE_MASK))
 204 #define pud_page(pud)   (pfn_to_page(pud_val((pud)) >> PAGE_SHIFT))
 205 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
 206 #define pud_offset(pgd, address)                                        \
 207         ((pud_t *)pgd_page_vaddr(*(pgd)) + pud_index((address)))
 208 #define pud_present(pud) (pud_val((pud)) & _PAGE_PRESENT)
 209
 210 static inline int pud_large(pud_t pte)
 211 {
 212         return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 213                 (_PAGE_PSE | _PAGE_PRESENT);
 214 }
 215
 216 /* PMD  - Level 2 access */
 217 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val((pmd)) & PTE_MASK))
 218 #define pmd_page(pmd)           (pfn_to_page(pmd_val((pmd)) >> PAGE_SHIFT))
 219
 220 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
 221 #define pmd_offset(dir, address) ((pmd_t *)pud_page_vaddr(*(dir)) + \
 222                                   pmd_index(address))
 223 #define pmd_none(x)     (!pmd_val((x)))
 224 #define pmd_present(x)  (pmd_val((x)) & _PAGE_PRESENT)
 225 #define pfn_pmd(nr, prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val((prot))))
 226 #define pmd_pfn(x)  ((pmd_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 227
 228 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 229 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) |     \
 230                                             _PAGE_FILE })
 231 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 232
 233 /* PTE - Level 1 access. */
 234
 235 /* page, protection -> pte */
 236 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn((page)), (pgprot))
 237
 238 #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 239 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
 240                                          pte_index((address)))
 241
 242 /* x86-64 always has all page tables mapped. */
 243 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 244 #define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
 245 #define pte_unmap(pte) /* NOP */
 246 #define pte_unmap_nested(pte) /* NOP */
 247
 248 #define update_mmu_cache(vma, address, pte) do { } while (0)
 249
 250 extern int direct_gbpages;
 251
 252 /* Encode and de-code a swap entry */
 253 #define __swp_type(x)                   (((x).val >> 1) & 0x3f)
 254 #define __swp_offset(x)                 ((x).val >> 8)
 255 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | \
 256                                                          ((offset) << 8) })
 257 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 258 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 259
 260 extern int kern_addr_valid(unsigned long addr);
 261 extern void cleanup_highmap(void);
 262
 263 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 264         remap_pfn_range(vma, vaddr, pfn, size, prot)
 265
 266 #define HAVE_ARCH_UNMAPPED_AREA
 267 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 268
 269 #define pgtable_cache_init()   do { } while (0)
 270 #define check_pgt_cache()      do { } while (0)
 271
 272 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 273 #define HAVE_PAGE_AGP 1
 274
 275 /* fs/proc/kcore.c */
 276 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 277 #define kc_offset_to_vaddr(o)                           \
 278         (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1)))    \
 279          ? ((o) | ~__VIRTUAL_MASK)                      \
 280          : (o))
 281
 282 #define __HAVE_ARCH_PTE_SAME
 283 #endif /* !__ASSEMBLY__ */
 284
 285 #endif /* _X86_64_PGTABLE_H */