arch/x86/include/asm/pgtable_types.h

   1 #ifndef _ASM_X86_PGTABLE_DEFS_H
   2 #define _ASM_X86_PGTABLE_DEFS_H
   3
   4 #include <linux/const.h>
   5 #include <asm/page_types.h>
   6
   7 #define FIRST_USER_ADDRESS      0UL
   8
   9 #define _PAGE_BIT_PRESENT       0       /* is present */
  10 #define _PAGE_BIT_RW            1       /* writeable */
  11 #define _PAGE_BIT_USER          2       /* userspace addressable */
  12 #define _PAGE_BIT_PWT           3       /* page write through */
  13 #define _PAGE_BIT_PCD           4       /* page cache disabled */
  14 #define _PAGE_BIT_ACCESSED      5       /* was accessed (raised by CPU) */
  15 #define _PAGE_BIT_DIRTY         6       /* was written to (raised by CPU) */
  16 #define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
  17 #define _PAGE_BIT_PAT           7       /* on 4KB pages */
  18 #define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
  19 #define _PAGE_BIT_SOFTW1        9       /* available for programmer */
  20 #define _PAGE_BIT_SOFTW2        10      /* " */
  21 #define _PAGE_BIT_SOFTW3        11      /* " */
  22 #define _PAGE_BIT_PAT_LARGE     12      /* On 2MB or 1GB pages */
  23 #define _PAGE_BIT_SOFTW4        58      /* available for programmer */
  24 #define _PAGE_BIT_PKEY_BIT0     59      /* Protection Keys, bit 1/4 */
  25 #define _PAGE_BIT_PKEY_BIT1     60      /* Protection Keys, bit 2/4 */
  26 #define _PAGE_BIT_PKEY_BIT2     61      /* Protection Keys, bit 3/4 */
  27 #define _PAGE_BIT_PKEY_BIT3     62      /* Protection Keys, bit 4/4 */
  28 #define _PAGE_BIT_NX            63      /* No execute: only valid after cpuid check */
  29
  30 #define _PAGE_BIT_SPECIAL       _PAGE_BIT_SOFTW1
  31 #define _PAGE_BIT_CPA_TEST      _PAGE_BIT_SOFTW1
  32 #define _PAGE_BIT_HIDDEN        _PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
  33 #define _PAGE_BIT_SOFT_DIRTY    _PAGE_BIT_SOFTW3 /* software dirty tracking */
  34 #define _PAGE_BIT_DEVMAP        _PAGE_BIT_SOFTW4
  35
  36 /* If _PAGE_BIT_PRESENT is clear, we use these: */
  37 /* - if the user mapped it with PROT_NONE; pte_present gives true */
  38 #define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
  39
  40 #define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
  41 #define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
  42 #define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
  43 #define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
  44 #define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
  45 #define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
  46 #define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
  47 #define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
  48 #define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
  49 #define _PAGE_SOFTW1    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
  50 #define _PAGE_SOFTW2    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
  51 #define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
  52 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
  53 #define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
  54 #define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
  55 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
  56 #define _PAGE_PKEY_BIT0 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT0)
  57 #define _PAGE_PKEY_BIT1 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT1)
  58 #define _PAGE_PKEY_BIT2 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT2)
  59 #define _PAGE_PKEY_BIT3 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT3)
  60 #else
  61 #define _PAGE_PKEY_BIT0 (_AT(pteval_t, 0))
  62 #define _PAGE_PKEY_BIT1 (_AT(pteval_t, 0))
  63 #define _PAGE_PKEY_BIT2 (_AT(pteval_t, 0))
  64 #define _PAGE_PKEY_BIT3 (_AT(pteval_t, 0))
  65 #endif
  66 #define __HAVE_ARCH_PTE_SPECIAL
  67
  68 #define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
  69                          _PAGE_PKEY_BIT1 | \
  70                          _PAGE_PKEY_BIT2 | \
  71                          _PAGE_PKEY_BIT3)
  72
  73 #ifdef CONFIG_KMEMCHECK
  74 #define _PAGE_HIDDEN    (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
  75 #else
  76 #define _PAGE_HIDDEN    (_AT(pteval_t, 0))
  77 #endif
  78
  79 /*
  80  * The same hidden bit is used by kmemcheck, but since kmemcheck
  81  * works on kernel pages while soft-dirty engine on user space,
  82  * they do not conflict with each other.
  83  */
  84
  85 #ifdef CONFIG_MEM_SOFT_DIRTY
  86 #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
  87 #else
  88 #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 0))
  89 #endif
  90
  91 /*
  92  * Tracking soft dirty bit when a page goes to a swap is tricky.
  93  * We need a bit which can be stored in pte _and_ not conflict
  94  * with swap entry format. On x86 bits 6 and 7 are *not* involved
  95  * into swap entry computation, but bit 6 is used for nonlinear
  96  * file mapping, so we borrow bit 7 for soft dirty tracking.
  97  *
  98  * Please note that this bit must be treated as swap dirty page
  99  * mark if and only if the PTE has present bit clear!
 100  */
 101 #ifdef CONFIG_MEM_SOFT_DIRTY
 102 #define _PAGE_SWP_SOFT_DIRTY    _PAGE_PSE
 103 #else
 104 #define _PAGE_SWP_SOFT_DIRTY    (_AT(pteval_t, 0))
 105 #endif
 106
 107 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 108 #define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
 109 #define _PAGE_DEVMAP    (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
 110 #define __HAVE_ARCH_PTE_DEVMAP
 111 #else
 112 #define _PAGE_NX        (_AT(pteval_t, 0))
 113 #define _PAGE_DEVMAP    (_AT(pteval_t, 0))
 114 #endif
 115
 116 #define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
 117
 118 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
 119                          _PAGE_ACCESSED | _PAGE_DIRTY)
 120 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
 121                          _PAGE_DIRTY)
 122
 123 /*
 124  * Set of bits not changed in pte_modify.  The pte's
 125  * protection key is treated like _PAGE_RW, for
 126  * instance, and is *not* included in this mask since
 127  * pte_modify() does modify it.
 128  */
 129 #define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
 130                          _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
 131                          _PAGE_SOFT_DIRTY)
 132 #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
 133
 134 /*
 135  * The cache modes defined here are used to translate between pure SW usage
 136  * and the HW defined cache mode bits and/or PAT entries.
 137  *
 138  * The resulting bits for PWT, PCD and PAT should be chosen in a way
 139  * to have the WB mode at index 0 (all bits clear). This is the default
 140  * right now and likely would break too much if changed.
 141  */
 142 #ifndef __ASSEMBLY__
 143 enum page_cache_mode {
 144         _PAGE_CACHE_MODE_WB = 0,
 145         _PAGE_CACHE_MODE_WC = 1,
 146         _PAGE_CACHE_MODE_UC_MINUS = 2,
 147         _PAGE_CACHE_MODE_UC = 3,
 148         _PAGE_CACHE_MODE_WT = 4,
 149         _PAGE_CACHE_MODE_WP = 5,
 150         _PAGE_CACHE_MODE_NUM = 8
 151 };
 152 #endif
 153
 154 #define _PAGE_CACHE_MASK        (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)
 155 #define _PAGE_NOCACHE           (cachemode2protval(_PAGE_CACHE_MODE_UC))
 156
 157 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 158 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 159                                  _PAGE_ACCESSED | _PAGE_NX)
 160
 161 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
 162                                          _PAGE_USER | _PAGE_ACCESSED)
 163 #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 164                                          _PAGE_ACCESSED | _PAGE_NX)
 165 #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 166                                          _PAGE_ACCESSED)
 167 #define PAGE_COPY               PAGE_COPY_NOEXEC
 168 #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 169                                          _PAGE_ACCESSED | _PAGE_NX)
 170 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 171                                          _PAGE_ACCESSED)
 172
 173 #define __PAGE_KERNEL_EXEC                                              \
 174         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
 175 #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
 176
 177 #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
 178 #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 179 #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_NOCACHE)
 180 #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 181 #define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
 182 #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 183 #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 184
 185 #define __PAGE_KERNEL_IO                (__PAGE_KERNEL)
 186 #define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE)
 187
 188 #define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
 189 #define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
 190 #define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
 191 #define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
 192 #define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
 193 #define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
 194 #define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 195 #define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
 196 #define PAGE_KERNEL_VVAR                __pgprot(__PAGE_KERNEL_VVAR)
 197
 198 #define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
 199 #define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 200
 201 /*         xwr */
 202 #define __P000  PAGE_NONE
 203 #define __P001  PAGE_READONLY
 204 #define __P010  PAGE_COPY
 205 #define __P011  PAGE_COPY
 206 #define __P100  PAGE_READONLY_EXEC
 207 #define __P101  PAGE_READONLY_EXEC
 208 #define __P110  PAGE_COPY_EXEC
 209 #define __P111  PAGE_COPY_EXEC
 210
 211 #define __S000  PAGE_NONE
 212 #define __S001  PAGE_READONLY
 213 #define __S010  PAGE_SHARED
 214 #define __S011  PAGE_SHARED
 215 #define __S100  PAGE_READONLY_EXEC
 216 #define __S101  PAGE_READONLY_EXEC
 217 #define __S110  PAGE_SHARED_EXEC
 218 #define __S111  PAGE_SHARED_EXEC
 219
 220 /*
 221  * early identity mapping  pte attrib macros.
 222  */
 223 #ifdef CONFIG_X86_64
 224 #define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 225 #else
 226 #define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 227 #define PDE_IDENT_ATTR   0x063          /* PRESENT+RW+DIRTY+ACCESSED */
 228 #define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 229 #endif
 230
 231 #ifdef CONFIG_X86_32
 232 # include <asm/pgtable_32_types.h>
 233 #else
 234 # include <asm/pgtable_64_types.h>
 235 #endif
 236
 237 #ifndef __ASSEMBLY__
 238
 239 #include <linux/types.h>
 240
 241 /* Extracts the PFN from a (pte|pmd|pud|pgd)val_t of a 4KB page */
 242 #define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 243
 244 /*
 245  *  Extracts the flags from a (pte|pmd|pud|pgd)val_t
 246  *  This includes the protection key value.
 247  */
 248 #define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 249
 250 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 251
 252 typedef struct { pgdval_t pgd; } pgd_t;
 253
 254 static inline pgd_t native_make_pgd(pgdval_t val)
 255 {
 256         return (pgd_t) { val };
 257 }
 258
 259 static inline pgdval_t native_pgd_val(pgd_t pgd)
 260 {
 261         return pgd.pgd;
 262 }
 263
 264 static inline pgdval_t pgd_flags(pgd_t pgd)
 265 {
 266         return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 267 }
 268
 269 #if CONFIG_PGTABLE_LEVELS > 3
 270 typedef struct { pudval_t pud; } pud_t;
 271
 272 static inline pud_t native_make_pud(pmdval_t val)
 273 {
 274         return (pud_t) { val };
 275 }
 276
 277 static inline pudval_t native_pud_val(pud_t pud)
 278 {
 279         return pud.pud;
 280 }
 281 #else
 282 #include <asm-generic/pgtable-nopud.h>
 283
 284 static inline pudval_t native_pud_val(pud_t pud)
 285 {
 286         return native_pgd_val(pud.pgd);
 287 }
 288 #endif
 289
 290 #if CONFIG_PGTABLE_LEVELS > 2
 291 typedef struct { pmdval_t pmd; } pmd_t;
 292
 293 static inline pmd_t native_make_pmd(pmdval_t val)
 294 {
 295         return (pmd_t) { val };
 296 }
 297
 298 static inline pmdval_t native_pmd_val(pmd_t pmd)
 299 {
 300         return pmd.pmd;
 301 }
 302 #else
 303 #include <asm-generic/pgtable-nopmd.h>
 304
 305 static inline pmdval_t native_pmd_val(pmd_t pmd)
 306 {
 307         return native_pgd_val(pmd.pud.pgd);
 308 }
 309 #endif
 310
 311 static inline pudval_t pud_pfn_mask(pud_t pud)
 312 {
 313         if (native_pud_val(pud) & _PAGE_PSE)
 314                 return PHYSICAL_PUD_PAGE_MASK;
 315         else
 316                 return PTE_PFN_MASK;
 317 }
 318
 319 static inline pudval_t pud_flags_mask(pud_t pud)
 320 {
 321         return ~pud_pfn_mask(pud);
 322 }
 323
 324 static inline pudval_t pud_flags(pud_t pud)
 325 {
 326         return native_pud_val(pud) & pud_flags_mask(pud);
 327 }
 328
 329 static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
 330 {
 331         if (native_pmd_val(pmd) & _PAGE_PSE)
 332                 return PHYSICAL_PMD_PAGE_MASK;
 333         else
 334                 return PTE_PFN_MASK;
 335 }
 336
 337 static inline pmdval_t pmd_flags_mask(pmd_t pmd)
 338 {
 339         return ~pmd_pfn_mask(pmd);
 340 }
 341
 342 static inline pmdval_t pmd_flags(pmd_t pmd)
 343 {
 344         return native_pmd_val(pmd) & pmd_flags_mask(pmd);
 345 }
 346
 347 static inline pte_t native_make_pte(pteval_t val)
 348 {
 349         return (pte_t) { .pte = val };
 350 }
 351
 352 static inline pteval_t native_pte_val(pte_t pte)
 353 {
 354         return pte.pte;
 355 }
 356
 357 static inline pteval_t pte_flags(pte_t pte)
 358 {
 359         return native_pte_val(pte) & PTE_FLAGS_MASK;
 360 }
 361
 362 #define pgprot_val(x)   ((x).pgprot)
 363 #define __pgprot(x)     ((pgprot_t) { (x) } )
 364
 365 extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
 366 extern uint8_t __pte2cachemode_tbl[8];
 367
 368 #define __pte2cm_idx(cb)                                \
 369         ((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) |          \
 370          (((cb) >> (_PAGE_BIT_PCD - 1)) & 2) |          \
 371          (((cb) >> _PAGE_BIT_PWT) & 1))
 372 #define __cm_idx2pte(i)                                 \
 373         ((((i) & 4) << (_PAGE_BIT_PAT - 2)) |           \
 374          (((i) & 2) << (_PAGE_BIT_PCD - 1)) |           \
 375          (((i) & 1) << _PAGE_BIT_PWT))
 376
 377 static inline unsigned long cachemode2protval(enum page_cache_mode pcm)
 378 {
 379         if (likely(pcm == 0))
 380                 return 0;
 381         return __cachemode2pte_tbl[pcm];
 382 }
 383 static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
 384 {
 385         return __pgprot(cachemode2protval(pcm));
 386 }
 387 static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
 388 {
 389         unsigned long masked;
 390
 391         masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
 392         if (likely(masked == 0))
 393                 return 0;
 394         return __pte2cachemode_tbl[__pte2cm_idx(masked)];
 395 }
 396 static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
 397 {
 398         pgprotval_t val = pgprot_val(pgprot);
 399         pgprot_t new;
 400
 401         pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 402                 ((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 403         return new;
 404 }
 405 static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
 406 {
 407         pgprotval_t val = pgprot_val(pgprot);
 408         pgprot_t new;
 409
 410         pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 411                           ((val & _PAGE_PAT_LARGE) >>
 412                            (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 413         return new;
 414 }
 415
 416
 417 typedef struct page *pgtable_t;
 418
 419 extern pteval_t __supported_pte_mask;
 420 extern void set_nx(void);
 421 extern int nx_enabled;
 422
 423 #define pgprot_writecombine     pgprot_writecombine
 424 extern pgprot_t pgprot_writecombine(pgprot_t prot);
 425
 426 #define pgprot_writethrough     pgprot_writethrough
 427 extern pgprot_t pgprot_writethrough(pgprot_t prot);
 428
 429 /* Indicate that x86 has its own track and untrack pfn vma functions */
 430 #define __HAVE_PFNMAP_TRACKING
 431
 432 #define __HAVE_PHYS_MEM_ACCESS_PROT
 433 struct file;
 434 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 435                               unsigned long size, pgprot_t vma_prot);
 436 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 437                               unsigned long size, pgprot_t *vma_prot);
 438
 439 /* Install a pte for a particular vaddr in kernel space. */
 440 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 441
 442 #ifdef CONFIG_X86_32
 443 extern void native_pagetable_init(void);
 444 #else
 445 #define native_pagetable_init        paging_init
 446 #endif
 447
 448 struct seq_file;
 449 extern void arch_report_meminfo(struct seq_file *m);
 450
 451 enum pg_level {
 452         PG_LEVEL_NONE,
 453         PG_LEVEL_4K,
 454         PG_LEVEL_2M,
 455         PG_LEVEL_1G,
 456         PG_LEVEL_NUM
 457 };
 458
 459 #ifdef CONFIG_PROC_FS
 460 extern void update_page_count(int level, unsigned long pages);
 461 #else
 462 static inline void update_page_count(int level, unsigned long pages) { }
 463 #endif
 464
 465 /*
 466  * Helper function that returns the kernel pagetable entry controlling
 467  * the virtual address 'address'. NULL means no pagetable entry present.
 468  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 469  * as a pte too.
 470  */
 471 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 472 extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
 473                                     unsigned int *level);
 474 extern pmd_t *lookup_pmd_address(unsigned long address);
 475 extern phys_addr_t slow_virt_to_phys(void *__address);
 476 extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
 477                                    unsigned numpages, unsigned long page_flags);
 478 void kernel_unmap_pages_in_pgd(pgd_t *root, unsigned long address,
 479                                unsigned numpages);
 480 #endif  /* !__ASSEMBLY__ */
 481
 482 #endif /* _ASM_X86_PGTABLE_DEFS_H */