LXR linux/arch/x86/include/asm/pgtable

   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#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  74#define _PAGE_KNL_ERRATUM_MASK (_PAGE_DIRTY | _PAGE_ACCESSED)
  75#else
  76#define _PAGE_KNL_ERRATUM_MASK 0
  77#endif
  78
  79#ifdef CONFIG_KMEMCHECK
  80#define _PAGE_HIDDEN    (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
  81#else
  82#define _PAGE_HIDDEN    (_AT(pteval_t, 0))
  83#endif
  84
  85/*
  86 * The same hidden bit is used by kmemcheck, but since kmemcheck
  87 * works on kernel pages while soft-dirty engine on user space,
  88 * they do not conflict with each other.
  89 */
  90
  91#ifdef CONFIG_MEM_SOFT_DIRTY
  92#define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
  93#else
  94#define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 0))
  95#endif
  96
  97/*
  98 * Tracking soft dirty bit when a page goes to a swap is tricky.
  99 * We need a bit which can be stored in pte _and_ not conflict
 100 * with swap entry format. On x86 bits 6 and 7 are *not* involved
 101 * into swap entry computation, but bit 6 is used for nonlinear
 102 * file mapping, so we borrow bit 7 for soft dirty tracking.
 103 *
 104 * Please note that this bit must be treated as swap dirty page
 105 * mark if and only if the PTE has present bit clear!
 106 */
 107#ifdef CONFIG_MEM_SOFT_DIRTY
 108#define _PAGE_SWP_SOFT_DIRTY    _PAGE_PSE
 109#else
 110#define _PAGE_SWP_SOFT_DIRTY    (_AT(pteval_t, 0))
 111#endif
 112
 113#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 114#define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
 115#define _PAGE_DEVMAP    (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
 116#define __HAVE_ARCH_PTE_DEVMAP
 117#else
 118#define _PAGE_NX        (_AT(pteval_t, 0))
 119#define _PAGE_DEVMAP    (_AT(pteval_t, 0))
 120#endif
 121
 122#define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
 123
 124#define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
 125                         _PAGE_ACCESSED | _PAGE_DIRTY)
 126#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
 127                         _PAGE_DIRTY)
 128
 129/*
 130 * Set of bits not changed in pte_modify.  The pte's
 131 * protection key is treated like _PAGE_RW, for
 132 * instance, and is *not* included in this mask since
 133 * pte_modify() does modify it.
 134 */
 135#define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
 136                         _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
 137                         _PAGE_SOFT_DIRTY)
 138#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
 139
 140/*
 141 * The cache modes defined here are used to translate between pure SW usage
 142 * and the HW defined cache mode bits and/or PAT entries.
 143 *
 144 * The resulting bits for PWT, PCD and PAT should be chosen in a way
 145 * to have the WB mode at index 0 (all bits clear). This is the default
 146 * right now and likely would break too much if changed.
 147 */
 148#ifndef __ASSEMBLY__
 149enum page_cache_mode {
 150        _PAGE_CACHE_MODE_WB = 0,
 151        _PAGE_CACHE_MODE_WC = 1,
 152        _PAGE_CACHE_MODE_UC_MINUS = 2,
 153        _PAGE_CACHE_MODE_UC = 3,
 154        _PAGE_CACHE_MODE_WT = 4,
 155        _PAGE_CACHE_MODE_WP = 5,
 156        _PAGE_CACHE_MODE_NUM = 8
 157};
 158#endif
 159
 160#define _PAGE_CACHE_MASK        (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)
 161#define _PAGE_NOCACHE           (cachemode2protval(_PAGE_CACHE_MODE_UC))
 162
 163#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 164#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 165                                 _PAGE_ACCESSED | _PAGE_NX)
 166
 167#define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
 168                                         _PAGE_USER | _PAGE_ACCESSED)
 169#define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 170                                         _PAGE_ACCESSED | _PAGE_NX)
 171#define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 172                                         _PAGE_ACCESSED)
 173#define PAGE_COPY               PAGE_COPY_NOEXEC
 174#define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 175                                         _PAGE_ACCESSED | _PAGE_NX)
 176#define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 177                                         _PAGE_ACCESSED)
 178
 179#define __PAGE_KERNEL_EXEC                                              \
 180        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
 181#define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
 182
 183#define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
 184#define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 185#define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_NOCACHE)
 186#define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 187#define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
 188#define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 189#define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 190
 191#define __PAGE_KERNEL_IO                (__PAGE_KERNEL)
 192#define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE)
 193
 194#define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
 195#define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
 196#define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
 197#define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
 198#define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
 199#define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
 200#define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 201#define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
 202#define PAGE_KERNEL_VVAR                __pgprot(__PAGE_KERNEL_VVAR)
 203
 204#define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
 205#define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 206
 207/*         xwr */
 208#define __P000  PAGE_NONE
 209#define __P001  PAGE_READONLY
 210#define __P010  PAGE_COPY
 211#define __P011  PAGE_COPY
 212#define __P100  PAGE_READONLY_EXEC
 213#define __P101  PAGE_READONLY_EXEC
 214#define __P110  PAGE_COPY_EXEC
 215#define __P111  PAGE_COPY_EXEC
 216
 217#define __S000  PAGE_NONE
 218#define __S001  PAGE_READONLY
 219#define __S010  PAGE_SHARED
 220#define __S011  PAGE_SHARED
 221#define __S100  PAGE_READONLY_EXEC
 222#define __S101  PAGE_READONLY_EXEC
 223#define __S110  PAGE_SHARED_EXEC
 224#define __S111  PAGE_SHARED_EXEC
 225
 226/*
 227 * early identity mapping  pte attrib macros.
 228 */
 229#ifdef CONFIG_X86_64
 230#define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 231#else
 232#define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 233#define PDE_IDENT_ATTR   0x063          /* PRESENT+RW+DIRTY+ACCESSED */
 234#define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 235#endif
 236
 237#ifdef CONFIG_X86_32
 238# include <asm/pgtable_32_types.h>
 239#else
 240# include <asm/pgtable_64_types.h>
 241#endif
 242
 243#ifndef __ASSEMBLY__
 244
 245#include <linux/types.h>
 246
 247/* Extracts the PFN from a (pte|pmd|pud|pgd)val_t of a 4KB page */
 248#define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 249
 250/*
 251 *  Extracts the flags from a (pte|pmd|pud|pgd)val_t
 252 *  This includes the protection key value.
 253 */
 254#define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 255
 256typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 257
 258typedef struct { pgdval_t pgd; } pgd_t;
 259
 260static inline pgd_t native_make_pgd(pgdval_t val)
 261{
 262        return (pgd_t) { val };
 263}
 264
 265static inline pgdval_t native_pgd_val(pgd_t pgd)
 266{
 267        return pgd.pgd;
 268}
 269
 270static inline pgdval_t pgd_flags(pgd_t pgd)
 271{
 272        return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 273}
 274
 275#if CONFIG_PGTABLE_LEVELS > 3
 276typedef struct { pudval_t pud; } pud_t;
 277
 278static inline pud_t native_make_pud(pmdval_t val)
 279{
 280        return (pud_t) { val };
 281}
 282
 283static inline pudval_t native_pud_val(pud_t pud)
 284{
 285        return pud.pud;
 286}
 287#else
 288#include <asm-generic/pgtable-nopud.h>
 289
 290static inline pudval_t native_pud_val(pud_t pud)
 291{
 292        return native_pgd_val(pud.pgd);
 293}
 294#endif
 295
 296#if CONFIG_PGTABLE_LEVELS > 2
 297typedef struct { pmdval_t pmd; } pmd_t;
 298
 299static inline pmd_t native_make_pmd(pmdval_t val)
 300{
 301        return (pmd_t) { val };
 302}
 303
 304static inline pmdval_t native_pmd_val(pmd_t pmd)
 305{
 306        return pmd.pmd;
 307}
 308#else
 309#include <asm-generic/pgtable-nopmd.h>
 310
 311static inline pmdval_t native_pmd_val(pmd_t pmd)
 312{
 313        return native_pgd_val(pmd.pud.pgd);
 314}
 315#endif
 316
 317static inline pudval_t pud_pfn_mask(pud_t pud)
 318{
 319        if (native_pud_val(pud) & _PAGE_PSE)
 320                return PHYSICAL_PUD_PAGE_MASK;
 321        else
 322                return PTE_PFN_MASK;
 323}
 324
 325static inline pudval_t pud_flags_mask(pud_t pud)
 326{
 327        return ~pud_pfn_mask(pud);
 328}
 329
 330static inline pudval_t pud_flags(pud_t pud)
 331{
 332        return native_pud_val(pud) & pud_flags_mask(pud);
 333}
 334
 335static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
 336{
 337        if (native_pmd_val(pmd) & _PAGE_PSE)
 338                return PHYSICAL_PMD_PAGE_MASK;
 339        else
 340                return PTE_PFN_MASK;
 341}
 342
 343static inline pmdval_t pmd_flags_mask(pmd_t pmd)
 344{
 345        return ~pmd_pfn_mask(pmd);
 346}
 347
 348static inline pmdval_t pmd_flags(pmd_t pmd)
 349{
 350        return native_pmd_val(pmd) & pmd_flags_mask(pmd);
 351}
 352
 353static inline pte_t native_make_pte(pteval_t val)
 354{
 355        return (pte_t) { .pte = val };
 356}
 357
 358static inline pteval_t native_pte_val(pte_t pte)
 359{
 360        return pte.pte;
 361}
 362
 363static inline pteval_t pte_flags(pte_t pte)
 364{
 365        return native_pte_val(pte) & PTE_FLAGS_MASK;
 366}
 367
 368#define pgprot_val(x)   ((x).pgprot)
 369#define __pgprot(x)     ((pgprot_t) { (x) } )
 370
 371extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
 372extern uint8_t __pte2cachemode_tbl[8];
 373
 374#define __pte2cm_idx(cb)                                \
 375        ((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) |          \
 376         (((cb) >> (_PAGE_BIT_PCD - 1)) & 2) |          \
 377         (((cb) >> _PAGE_BIT_PWT) & 1))
 378#define __cm_idx2pte(i)                                 \
 379        ((((i) & 4) << (_PAGE_BIT_PAT - 2)) |           \
 380         (((i) & 2) << (_PAGE_BIT_PCD - 1)) |           \
 381         (((i) & 1) << _PAGE_BIT_PWT))
 382
 383static inline unsigned long cachemode2protval(enum page_cache_mode pcm)
 384{
 385        if (likely(pcm == 0))
 386                return 0;
 387        return __cachemode2pte_tbl[pcm];
 388}
 389static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
 390{
 391        return __pgprot(cachemode2protval(pcm));
 392}
 393static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
 394{
 395        unsigned long masked;
 396
 397        masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
 398        if (likely(masked == 0))
 399                return 0;
 400        return __pte2cachemode_tbl[__pte2cm_idx(masked)];
 401}
 402static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
 403{
 404        pgprotval_t val = pgprot_val(pgprot);
 405        pgprot_t new;
 406
 407        pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 408                ((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 409        return new;
 410}
 411static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
 412{
 413        pgprotval_t val = pgprot_val(pgprot);
 414        pgprot_t new;
 415
 416        pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 417                          ((val & _PAGE_PAT_LARGE) >>
 418                           (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 419        return new;
 420}
 421
 422
 423typedef struct page *pgtable_t;
 424
 425extern pteval_t __supported_pte_mask;
 426extern void set_nx(void);
 427extern int nx_enabled;
 428
 429#define pgprot_writecombine     pgprot_writecombine
 430extern pgprot_t pgprot_writecombine(pgprot_t prot);
 431
 432#define pgprot_writethrough     pgprot_writethrough
 433extern pgprot_t pgprot_writethrough(pgprot_t prot);
 434
 435/* Indicate that x86 has its own track and untrack pfn vma functions */
 436#define __HAVE_PFNMAP_TRACKING
 437
 438#define __HAVE_PHYS_MEM_ACCESS_PROT
 439struct file;
 440pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 441                              unsigned long size, pgprot_t vma_prot);
 442int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 443                              unsigned long size, pgprot_t *vma_prot);
 444
 445/* Install a pte for a particular vaddr in kernel space. */
 446void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 447
 448#ifdef CONFIG_X86_32
 449extern void native_pagetable_init(void);
 450#else
 451#define native_pagetable_init        paging_init
 452#endif
 453
 454struct seq_file;
 455extern void arch_report_meminfo(struct seq_file *m);
 456
 457enum pg_level {
 458        PG_LEVEL_NONE,
 459        PG_LEVEL_4K,
 460        PG_LEVEL_2M,
 461        PG_LEVEL_1G,
 462        PG_LEVEL_NUM
 463};
 464
 465#ifdef CONFIG_PROC_FS
 466extern void update_page_count(int level, unsigned long pages);
 467#else
 468static inline void update_page_count(int level, unsigned long pages) { }
 469#endif
 470
 471/*
 472 * Helper function that returns the kernel pagetable entry controlling
 473 * the virtual address 'address'. NULL means no pagetable entry present.
 474 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 475 * as a pte too.
 476 */
 477extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 478extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
 479                                    unsigned int *level);
 480extern pmd_t *lookup_pmd_address(unsigned long address);
 481extern phys_addr_t slow_virt_to_phys(void *__address);
 482extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
 483                                   unsigned numpages, unsigned long page_flags);
 484#endif  /* !__ASSEMBLY__ */
 485
 486#endif /* _ASM_X86_PGTABLE_DEFS_H */
 487