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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_PGTABLE_DEFS_H
   3#define _ASM_X86_PGTABLE_DEFS_H
   4
   5#include <linux/const.h>
   6#include <linux/mem_encrypt.h>
   7
   8#include <asm/page_types.h>
   9
  10#define FIRST_USER_ADDRESS      0UL
  11
  12#define _PAGE_BIT_PRESENT       0       /* is present */
  13#define _PAGE_BIT_RW            1       /* writeable */
  14#define _PAGE_BIT_USER          2       /* userspace addressable */
  15#define _PAGE_BIT_PWT           3       /* page write through */
  16#define _PAGE_BIT_PCD           4       /* page cache disabled */
  17#define _PAGE_BIT_ACCESSED      5       /* was accessed (raised by CPU) */
  18#define _PAGE_BIT_DIRTY         6       /* was written to (raised by CPU) */
  19#define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
  20#define _PAGE_BIT_PAT           7       /* on 4KB pages */
  21#define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
  22#define _PAGE_BIT_SOFTW1        9       /* available for programmer */
  23#define _PAGE_BIT_SOFTW2        10      /* " */
  24#define _PAGE_BIT_SOFTW3        11      /* " */
  25#define _PAGE_BIT_PAT_LARGE     12      /* On 2MB or 1GB pages */
  26#define _PAGE_BIT_SOFTW4        58      /* available for programmer */
  27#define _PAGE_BIT_PKEY_BIT0     59      /* Protection Keys, bit 1/4 */
  28#define _PAGE_BIT_PKEY_BIT1     60      /* Protection Keys, bit 2/4 */
  29#define _PAGE_BIT_PKEY_BIT2     61      /* Protection Keys, bit 3/4 */
  30#define _PAGE_BIT_PKEY_BIT3     62      /* Protection Keys, bit 4/4 */
  31#define _PAGE_BIT_NX            63      /* No execute: only valid after cpuid check */
  32
  33#define _PAGE_BIT_SPECIAL       _PAGE_BIT_SOFTW1
  34#define _PAGE_BIT_CPA_TEST      _PAGE_BIT_SOFTW1
  35#define _PAGE_BIT_SOFT_DIRTY    _PAGE_BIT_SOFTW3 /* software dirty tracking */
  36#define _PAGE_BIT_DEVMAP        _PAGE_BIT_SOFTW4
  37
  38/* If _PAGE_BIT_PRESENT is clear, we use these: */
  39/* - if the user mapped it with PROT_NONE; pte_present gives true */
  40#define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
  41
  42#define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
  43#define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
  44#define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
  45#define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
  46#define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
  47#define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
  48#define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
  49#define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
  50#define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
  51#define _PAGE_SOFTW1    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
  52#define _PAGE_SOFTW2    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
  53#define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
  54#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
  55#define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
  56#define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
  57#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
  58#define _PAGE_PKEY_BIT0 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT0)
  59#define _PAGE_PKEY_BIT1 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT1)
  60#define _PAGE_PKEY_BIT2 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT2)
  61#define _PAGE_PKEY_BIT3 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT3)
  62#else
  63#define _PAGE_PKEY_BIT0 (_AT(pteval_t, 0))
  64#define _PAGE_PKEY_BIT1 (_AT(pteval_t, 0))
  65#define _PAGE_PKEY_BIT2 (_AT(pteval_t, 0))
  66#define _PAGE_PKEY_BIT3 (_AT(pteval_t, 0))
  67#endif
  68#define __HAVE_ARCH_PTE_SPECIAL
  69
  70#define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
  71                         _PAGE_PKEY_BIT1 | \
  72                         _PAGE_PKEY_BIT2 | \
  73                         _PAGE_PKEY_BIT3)
  74
  75#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  76#define _PAGE_KNL_ERRATUM_MASK (_PAGE_DIRTY | _PAGE_ACCESSED)
  77#else
  78#define _PAGE_KNL_ERRATUM_MASK 0
  79#endif
  80
  81#ifdef CONFIG_MEM_SOFT_DIRTY
  82#define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
  83#else
  84#define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 0))
  85#endif
  86
  87/*
  88 * Tracking soft dirty bit when a page goes to a swap is tricky.
  89 * We need a bit which can be stored in pte _and_ not conflict
  90 * with swap entry format. On x86 bits 1-4 are *not* involved
  91 * into swap entry computation, but bit 7 is used for thp migration,
  92 * so we borrow bit 1 for soft dirty tracking.
  93 *
  94 * Please note that this bit must be treated as swap dirty page
  95 * mark if and only if the PTE/PMD has present bit clear!
  96 */
  97#ifdef CONFIG_MEM_SOFT_DIRTY
  98#define _PAGE_SWP_SOFT_DIRTY    _PAGE_RW
  99#else
 100#define _PAGE_SWP_SOFT_DIRTY    (_AT(pteval_t, 0))
 101#endif
 102
 103#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 104#define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
 105#define _PAGE_DEVMAP    (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
 106#define __HAVE_ARCH_PTE_DEVMAP
 107#else
 108#define _PAGE_NX        (_AT(pteval_t, 0))
 109#define _PAGE_DEVMAP    (_AT(pteval_t, 0))
 110#endif
 111
 112#define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
 113
 114#define _PAGE_TABLE_NOENC       (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |\
 115                                 _PAGE_ACCESSED | _PAGE_DIRTY)
 116#define _KERNPG_TABLE_NOENC     (_PAGE_PRESENT | _PAGE_RW |             \
 117                                 _PAGE_ACCESSED | _PAGE_DIRTY)
 118
 119/*
 120 * Set of bits not changed in pte_modify.  The pte's
 121 * protection key is treated like _PAGE_RW, for
 122 * instance, and is *not* included in this mask since
 123 * pte_modify() does modify it.
 124 */
 125#define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
 126                         _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
 127                         _PAGE_SOFT_DIRTY)
 128#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
 129
 130/*
 131 * The cache modes defined here are used to translate between pure SW usage
 132 * and the HW defined cache mode bits and/or PAT entries.
 133 *
 134 * The resulting bits for PWT, PCD and PAT should be chosen in a way
 135 * to have the WB mode at index 0 (all bits clear). This is the default
 136 * right now and likely would break too much if changed.
 137 */
 138#ifndef __ASSEMBLY__
 139enum page_cache_mode {
 140        _PAGE_CACHE_MODE_WB = 0,
 141        _PAGE_CACHE_MODE_WC = 1,
 142        _PAGE_CACHE_MODE_UC_MINUS = 2,
 143        _PAGE_CACHE_MODE_UC = 3,
 144        _PAGE_CACHE_MODE_WT = 4,
 145        _PAGE_CACHE_MODE_WP = 5,
 146        _PAGE_CACHE_MODE_NUM = 8
 147};
 148#endif
 149
 150#define _PAGE_CACHE_MASK        (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)
 151#define _PAGE_NOCACHE           (cachemode2protval(_PAGE_CACHE_MODE_UC))
 152#define _PAGE_CACHE_WP          (cachemode2protval(_PAGE_CACHE_MODE_WP))
 153
 154#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 155#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 156                                 _PAGE_ACCESSED | _PAGE_NX)
 157
 158#define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
 159                                         _PAGE_USER | _PAGE_ACCESSED)
 160#define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 161                                         _PAGE_ACCESSED | _PAGE_NX)
 162#define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 163                                         _PAGE_ACCESSED)
 164#define PAGE_COPY               PAGE_COPY_NOEXEC
 165#define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 166                                         _PAGE_ACCESSED | _PAGE_NX)
 167#define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 168                                         _PAGE_ACCESSED)
 169
 170#define __PAGE_KERNEL_EXEC                                              \
 171        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
 172#define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
 173
 174#define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
 175#define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 176#define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_NOCACHE)
 177#define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
 178#define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 179#define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 180#define __PAGE_KERNEL_WP                (__PAGE_KERNEL | _PAGE_CACHE_WP)
 181
 182#define __PAGE_KERNEL_IO                (__PAGE_KERNEL)
 183#define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE)
 184
 185#ifndef __ASSEMBLY__
 186
 187#define _PAGE_ENC       (_AT(pteval_t, sme_me_mask))
 188
 189#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
 190                         _PAGE_DIRTY | _PAGE_ENC)
 191#define _PAGE_TABLE     (_KERNPG_TABLE | _PAGE_USER)
 192
 193#define __PAGE_KERNEL_ENC       (__PAGE_KERNEL | _PAGE_ENC)
 194#define __PAGE_KERNEL_ENC_WP    (__PAGE_KERNEL_WP | _PAGE_ENC)
 195
 196#define __PAGE_KERNEL_NOENC     (__PAGE_KERNEL)
 197#define __PAGE_KERNEL_NOENC_WP  (__PAGE_KERNEL_WP)
 198
 199#define default_pgprot(x)       __pgprot((x) & __default_kernel_pte_mask)
 200
 201#define PAGE_KERNEL             default_pgprot(__PAGE_KERNEL | _PAGE_ENC)
 202#define PAGE_KERNEL_NOENC       default_pgprot(__PAGE_KERNEL)
 203#define PAGE_KERNEL_RO          default_pgprot(__PAGE_KERNEL_RO | _PAGE_ENC)
 204#define PAGE_KERNEL_EXEC        default_pgprot(__PAGE_KERNEL_EXEC | _PAGE_ENC)
 205#define PAGE_KERNEL_EXEC_NOENC  default_pgprot(__PAGE_KERNEL_EXEC)
 206#define PAGE_KERNEL_RX          default_pgprot(__PAGE_KERNEL_RX | _PAGE_ENC)
 207#define PAGE_KERNEL_NOCACHE     default_pgprot(__PAGE_KERNEL_NOCACHE | _PAGE_ENC)
 208#define PAGE_KERNEL_LARGE       default_pgprot(__PAGE_KERNEL_LARGE | _PAGE_ENC)
 209#define PAGE_KERNEL_LARGE_EXEC  default_pgprot(__PAGE_KERNEL_LARGE_EXEC | _PAGE_ENC)
 210#define PAGE_KERNEL_VVAR        default_pgprot(__PAGE_KERNEL_VVAR | _PAGE_ENC)
 211
 212#define PAGE_KERNEL_IO          default_pgprot(__PAGE_KERNEL_IO)
 213#define PAGE_KERNEL_IO_NOCACHE  default_pgprot(__PAGE_KERNEL_IO_NOCACHE)
 214
 215#endif  /* __ASSEMBLY__ */
 216
 217/*         xwr */
 218#define __P000  PAGE_NONE
 219#define __P001  PAGE_READONLY
 220#define __P010  PAGE_COPY
 221#define __P011  PAGE_COPY
 222#define __P100  PAGE_READONLY_EXEC
 223#define __P101  PAGE_READONLY_EXEC
 224#define __P110  PAGE_COPY_EXEC
 225#define __P111  PAGE_COPY_EXEC
 226
 227#define __S000  PAGE_NONE
 228#define __S001  PAGE_READONLY
 229#define __S010  PAGE_SHARED
 230#define __S011  PAGE_SHARED
 231#define __S100  PAGE_READONLY_EXEC
 232#define __S101  PAGE_READONLY_EXEC
 233#define __S110  PAGE_SHARED_EXEC
 234#define __S111  PAGE_SHARED_EXEC
 235
 236/*
 237 * early identity mapping  pte attrib macros.
 238 */
 239#ifdef CONFIG_X86_64
 240#define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 241#else
 242#define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 243#define PDE_IDENT_ATTR   0x063          /* PRESENT+RW+DIRTY+ACCESSED */
 244#define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 245#endif
 246
 247#ifdef CONFIG_X86_32
 248# include <asm/pgtable_32_types.h>
 249#else
 250# include <asm/pgtable_64_types.h>
 251#endif
 252
 253#ifndef __ASSEMBLY__
 254
 255#include <linux/types.h>
 256
 257/* Extracts the PFN from a (pte|pmd|pud|pgd)val_t of a 4KB page */
 258#define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 259
 260/*
 261 *  Extracts the flags from a (pte|pmd|pud|pgd)val_t
 262 *  This includes the protection key value.
 263 */
 264#define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 265
 266typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 267
 268typedef struct { pgdval_t pgd; } pgd_t;
 269
 270static inline pgd_t native_make_pgd(pgdval_t val)
 271{
 272        return (pgd_t) { val };
 273}
 274
 275static inline pgdval_t native_pgd_val(pgd_t pgd)
 276{
 277        return pgd.pgd;
 278}
 279
 280static inline pgdval_t pgd_flags(pgd_t pgd)
 281{
 282        return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 283}
 284
 285#if CONFIG_PGTABLE_LEVELS > 4
 286typedef struct { p4dval_t p4d; } p4d_t;
 287
 288static inline p4d_t native_make_p4d(pudval_t val)
 289{
 290        return (p4d_t) { val };
 291}
 292
 293static inline p4dval_t native_p4d_val(p4d_t p4d)
 294{
 295        return p4d.p4d;
 296}
 297#else
 298#include <asm-generic/pgtable-nop4d.h>
 299
 300static inline p4d_t native_make_p4d(pudval_t val)
 301{
 302        return (p4d_t) { .pgd = native_make_pgd((pgdval_t)val) };
 303}
 304
 305static inline p4dval_t native_p4d_val(p4d_t p4d)
 306{
 307        return native_pgd_val(p4d.pgd);
 308}
 309#endif
 310
 311#if CONFIG_PGTABLE_LEVELS > 3
 312typedef struct { pudval_t pud; } pud_t;
 313
 314static inline pud_t native_make_pud(pmdval_t val)
 315{
 316        return (pud_t) { val };
 317}
 318
 319static inline pudval_t native_pud_val(pud_t pud)
 320{
 321        return pud.pud;
 322}
 323#else
 324#include <asm-generic/pgtable-nopud.h>
 325
 326static inline pud_t native_make_pud(pudval_t val)
 327{
 328        return (pud_t) { .p4d.pgd = native_make_pgd(val) };
 329}
 330
 331static inline pudval_t native_pud_val(pud_t pud)
 332{
 333        return native_pgd_val(pud.p4d.pgd);
 334}
 335#endif
 336
 337#if CONFIG_PGTABLE_LEVELS > 2
 338typedef struct { pmdval_t pmd; } pmd_t;
 339
 340static inline pmd_t native_make_pmd(pmdval_t val)
 341{
 342        return (pmd_t) { val };
 343}
 344
 345static inline pmdval_t native_pmd_val(pmd_t pmd)
 346{
 347        return pmd.pmd;
 348}
 349#else
 350#include <asm-generic/pgtable-nopmd.h>
 351
 352static inline pmd_t native_make_pmd(pmdval_t val)
 353{
 354        return (pmd_t) { .pud.p4d.pgd = native_make_pgd(val) };
 355}
 356
 357static inline pmdval_t native_pmd_val(pmd_t pmd)
 358{
 359        return native_pgd_val(pmd.pud.p4d.pgd);
 360}
 361#endif
 362
 363static inline p4dval_t p4d_pfn_mask(p4d_t p4d)
 364{
 365        /* No 512 GiB huge pages yet */
 366        return PTE_PFN_MASK;
 367}
 368
 369static inline p4dval_t p4d_flags_mask(p4d_t p4d)
 370{
 371        return ~p4d_pfn_mask(p4d);
 372}
 373
 374static inline p4dval_t p4d_flags(p4d_t p4d)
 375{
 376        return native_p4d_val(p4d) & p4d_flags_mask(p4d);
 377}
 378
 379static inline pudval_t pud_pfn_mask(pud_t pud)
 380{
 381        if (native_pud_val(pud) & _PAGE_PSE)
 382                return PHYSICAL_PUD_PAGE_MASK;
 383        else
 384                return PTE_PFN_MASK;
 385}
 386
 387static inline pudval_t pud_flags_mask(pud_t pud)
 388{
 389        return ~pud_pfn_mask(pud);
 390}
 391
 392static inline pudval_t pud_flags(pud_t pud)
 393{
 394        return native_pud_val(pud) & pud_flags_mask(pud);
 395}
 396
 397static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
 398{
 399        if (native_pmd_val(pmd) & _PAGE_PSE)
 400                return PHYSICAL_PMD_PAGE_MASK;
 401        else
 402                return PTE_PFN_MASK;
 403}
 404
 405static inline pmdval_t pmd_flags_mask(pmd_t pmd)
 406{
 407        return ~pmd_pfn_mask(pmd);
 408}
 409
 410static inline pmdval_t pmd_flags(pmd_t pmd)
 411{
 412        return native_pmd_val(pmd) & pmd_flags_mask(pmd);
 413}
 414
 415static inline pte_t native_make_pte(pteval_t val)
 416{
 417        return (pte_t) { .pte = val };
 418}
 419
 420static inline pteval_t native_pte_val(pte_t pte)
 421{
 422        return pte.pte;
 423}
 424
 425static inline pteval_t pte_flags(pte_t pte)
 426{
 427        return native_pte_val(pte) & PTE_FLAGS_MASK;
 428}
 429
 430#define pgprot_val(x)   ((x).pgprot)
 431#define __pgprot(x)     ((pgprot_t) { (x) } )
 432
 433extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
 434extern uint8_t __pte2cachemode_tbl[8];
 435
 436#define __pte2cm_idx(cb)                                \
 437        ((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) |          \
 438         (((cb) >> (_PAGE_BIT_PCD - 1)) & 2) |          \
 439         (((cb) >> _PAGE_BIT_PWT) & 1))
 440#define __cm_idx2pte(i)                                 \
 441        ((((i) & 4) << (_PAGE_BIT_PAT - 2)) |           \
 442         (((i) & 2) << (_PAGE_BIT_PCD - 1)) |           \
 443         (((i) & 1) << _PAGE_BIT_PWT))
 444
 445static inline unsigned long cachemode2protval(enum page_cache_mode pcm)
 446{
 447        if (likely(pcm == 0))
 448                return 0;
 449        return __cachemode2pte_tbl[pcm];
 450}
 451static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
 452{
 453        return __pgprot(cachemode2protval(pcm));
 454}
 455static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
 456{
 457        unsigned long masked;
 458
 459        masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
 460        if (likely(masked == 0))
 461                return 0;
 462        return __pte2cachemode_tbl[__pte2cm_idx(masked)];
 463}
 464static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
 465{
 466        pgprotval_t val = pgprot_val(pgprot);
 467        pgprot_t new;
 468
 469        pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 470                ((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 471        return new;
 472}
 473static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
 474{
 475        pgprotval_t val = pgprot_val(pgprot);
 476        pgprot_t new;
 477
 478        pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 479                          ((val & _PAGE_PAT_LARGE) >>
 480                           (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 481        return new;
 482}
 483
 484
 485typedef struct page *pgtable_t;
 486
 487extern pteval_t __supported_pte_mask;
 488extern pteval_t __default_kernel_pte_mask;
 489extern void set_nx(void);
 490extern int nx_enabled;
 491
 492#define pgprot_writecombine     pgprot_writecombine
 493extern pgprot_t pgprot_writecombine(pgprot_t prot);
 494
 495#define pgprot_writethrough     pgprot_writethrough
 496extern pgprot_t pgprot_writethrough(pgprot_t prot);
 497
 498/* Indicate that x86 has its own track and untrack pfn vma functions */
 499#define __HAVE_PFNMAP_TRACKING
 500
 501#define __HAVE_PHYS_MEM_ACCESS_PROT
 502struct file;
 503pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 504                              unsigned long size, pgprot_t vma_prot);
 505
 506/* Install a pte for a particular vaddr in kernel space. */
 507void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 508
 509#ifdef CONFIG_X86_32
 510extern void native_pagetable_init(void);
 511#else
 512#define native_pagetable_init        paging_init
 513#endif
 514
 515struct seq_file;
 516extern void arch_report_meminfo(struct seq_file *m);
 517
 518enum pg_level {
 519        PG_LEVEL_NONE,
 520        PG_LEVEL_4K,
 521        PG_LEVEL_2M,
 522        PG_LEVEL_1G,
 523        PG_LEVEL_512G,
 524        PG_LEVEL_NUM
 525};
 526
 527#ifdef CONFIG_PROC_FS
 528extern void update_page_count(int level, unsigned long pages);
 529#else
 530static inline void update_page_count(int level, unsigned long pages) { }
 531#endif
 532
 533/*
 534 * Helper function that returns the kernel pagetable entry controlling
 535 * the virtual address 'address'. NULL means no pagetable entry present.
 536 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 537 * as a pte too.
 538 */
 539extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 540extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
 541                                    unsigned int *level);
 542extern pmd_t *lookup_pmd_address(unsigned long address);
 543extern phys_addr_t slow_virt_to_phys(void *__address);
 544extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
 545                                   unsigned numpages, unsigned long page_flags);
 546#endif  /* !__ASSEMBLY__ */
 547
 548#endif /* _ASM_X86_PGTABLE_DEFS_H */
 549