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_HIDDEN        _PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
  36#define _PAGE_BIT_SOFT_DIRTY    _PAGE_BIT_SOFTW3 /* software dirty tracking */
  37#define _PAGE_BIT_DEVMAP        _PAGE_BIT_SOFTW4
  38
  39/* If _PAGE_BIT_PRESENT is clear, we use these: */
  40/* - if the user mapped it with PROT_NONE; pte_present gives true */
  41#define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
  42
  43#define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
  44#define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
  45#define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
  46#define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
  47#define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
  48#define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
  49#define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
  50#define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
  51#define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
  52#define _PAGE_SOFTW1    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
  53#define _PAGE_SOFTW2    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
  54#define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
  55#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
  56#define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
  57#define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
  58#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
  59#define _PAGE_PKEY_BIT0 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT0)
  60#define _PAGE_PKEY_BIT1 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT1)
  61#define _PAGE_PKEY_BIT2 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT2)
  62#define _PAGE_PKEY_BIT3 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT3)
  63#else
  64#define _PAGE_PKEY_BIT0 (_AT(pteval_t, 0))
  65#define _PAGE_PKEY_BIT1 (_AT(pteval_t, 0))
  66#define _PAGE_PKEY_BIT2 (_AT(pteval_t, 0))
  67#define _PAGE_PKEY_BIT3 (_AT(pteval_t, 0))
  68#endif
  69#define __HAVE_ARCH_PTE_SPECIAL
  70
  71#define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
  72                         _PAGE_PKEY_BIT1 | \
  73                         _PAGE_PKEY_BIT2 | \
  74                         _PAGE_PKEY_BIT3)
  75
  76#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  77#define _PAGE_KNL_ERRATUM_MASK (_PAGE_DIRTY | _PAGE_ACCESSED)
  78#else
  79#define _PAGE_KNL_ERRATUM_MASK 0
  80#endif
  81
  82#ifdef CONFIG_KMEMCHECK
  83#define _PAGE_HIDDEN    (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
  84#else
  85#define _PAGE_HIDDEN    (_AT(pteval_t, 0))
  86#endif
  87
  88/*
  89 * The same hidden bit is used by kmemcheck, but since kmemcheck
  90 * works on kernel pages while soft-dirty engine on user space,
  91 * they do not conflict with each other.
  92 */
  93
  94#ifdef CONFIG_MEM_SOFT_DIRTY
  95#define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
  96#else
  97#define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 0))
  98#endif
  99
 100/*
 101 * Tracking soft dirty bit when a page goes to a swap is tricky.
 102 * We need a bit which can be stored in pte _and_ not conflict
 103 * with swap entry format. On x86 bits 1-4 are *not* involved
 104 * into swap entry computation, but bit 7 is used for thp migration,
 105 * so we borrow bit 1 for soft dirty tracking.
 106 *
 107 * Please note that this bit must be treated as swap dirty page
 108 * mark if and only if the PTE/PMD has present bit clear!
 109 */
 110#ifdef CONFIG_MEM_SOFT_DIRTY
 111#define _PAGE_SWP_SOFT_DIRTY    _PAGE_RW
 112#else
 113#define _PAGE_SWP_SOFT_DIRTY    (_AT(pteval_t, 0))
 114#endif
 115
 116#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 117#define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
 118#define _PAGE_DEVMAP    (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
 119#define __HAVE_ARCH_PTE_DEVMAP
 120#else
 121#define _PAGE_NX        (_AT(pteval_t, 0))
 122#define _PAGE_DEVMAP    (_AT(pteval_t, 0))
 123#endif
 124
 125#define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
 126
 127#define _PAGE_TABLE_NOENC       (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |\
 128                                 _PAGE_ACCESSED | _PAGE_DIRTY)
 129#define _KERNPG_TABLE_NOENC     (_PAGE_PRESENT | _PAGE_RW |             \
 130                                 _PAGE_ACCESSED | _PAGE_DIRTY)
 131
 132/*
 133 * Set of bits not changed in pte_modify.  The pte's
 134 * protection key is treated like _PAGE_RW, for
 135 * instance, and is *not* included in this mask since
 136 * pte_modify() does modify it.
 137 */
 138#define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
 139                         _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
 140                         _PAGE_SOFT_DIRTY)
 141#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
 142
 143/*
 144 * The cache modes defined here are used to translate between pure SW usage
 145 * and the HW defined cache mode bits and/or PAT entries.
 146 *
 147 * The resulting bits for PWT, PCD and PAT should be chosen in a way
 148 * to have the WB mode at index 0 (all bits clear). This is the default
 149 * right now and likely would break too much if changed.
 150 */
 151#ifndef __ASSEMBLY__
 152enum page_cache_mode {
 153        _PAGE_CACHE_MODE_WB = 0,
 154        _PAGE_CACHE_MODE_WC = 1,
 155        _PAGE_CACHE_MODE_UC_MINUS = 2,
 156        _PAGE_CACHE_MODE_UC = 3,
 157        _PAGE_CACHE_MODE_WT = 4,
 158        _PAGE_CACHE_MODE_WP = 5,
 159        _PAGE_CACHE_MODE_NUM = 8
 160};
 161#endif
 162
 163#define _PAGE_CACHE_MASK        (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)
 164#define _PAGE_NOCACHE           (cachemode2protval(_PAGE_CACHE_MODE_UC))
 165#define _PAGE_CACHE_WP          (cachemode2protval(_PAGE_CACHE_MODE_WP))
 166
 167#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 168#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 169                                 _PAGE_ACCESSED | _PAGE_NX)
 170
 171#define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
 172                                         _PAGE_USER | _PAGE_ACCESSED)
 173#define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 174                                         _PAGE_ACCESSED | _PAGE_NX)
 175#define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 176                                         _PAGE_ACCESSED)
 177#define PAGE_COPY               PAGE_COPY_NOEXEC
 178#define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 179                                         _PAGE_ACCESSED | _PAGE_NX)
 180#define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
 181                                         _PAGE_ACCESSED)
 182
 183#define __PAGE_KERNEL_EXEC                                              \
 184        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
 185#define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
 186
 187#define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
 188#define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
 189#define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_NOCACHE)
 190#define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
 191#define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
 192#define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 193#define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 194#define __PAGE_KERNEL_WP                (__PAGE_KERNEL | _PAGE_CACHE_WP)
 195
 196#define __PAGE_KERNEL_IO                (__PAGE_KERNEL)
 197#define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE)
 198
 199#ifndef __ASSEMBLY__
 200
 201#define _PAGE_ENC       (_AT(pteval_t, sme_me_mask))
 202
 203#define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
 204                         _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_ENC)
 205#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
 206                         _PAGE_DIRTY | _PAGE_ENC)
 207
 208#define __PAGE_KERNEL_ENC       (__PAGE_KERNEL | _PAGE_ENC)
 209#define __PAGE_KERNEL_ENC_WP    (__PAGE_KERNEL_WP | _PAGE_ENC)
 210
 211#define __PAGE_KERNEL_NOENC     (__PAGE_KERNEL)
 212#define __PAGE_KERNEL_NOENC_WP  (__PAGE_KERNEL_WP)
 213
 214#define PAGE_KERNEL             __pgprot(__PAGE_KERNEL | _PAGE_ENC)
 215#define PAGE_KERNEL_NOENC       __pgprot(__PAGE_KERNEL)
 216#define PAGE_KERNEL_RO          __pgprot(__PAGE_KERNEL_RO | _PAGE_ENC)
 217#define PAGE_KERNEL_EXEC        __pgprot(__PAGE_KERNEL_EXEC | _PAGE_ENC)
 218#define PAGE_KERNEL_EXEC_NOENC  __pgprot(__PAGE_KERNEL_EXEC)
 219#define PAGE_KERNEL_RX          __pgprot(__PAGE_KERNEL_RX | _PAGE_ENC)
 220#define PAGE_KERNEL_NOCACHE     __pgprot(__PAGE_KERNEL_NOCACHE | _PAGE_ENC)
 221#define PAGE_KERNEL_LARGE       __pgprot(__PAGE_KERNEL_LARGE | _PAGE_ENC)
 222#define PAGE_KERNEL_LARGE_EXEC  __pgprot(__PAGE_KERNEL_LARGE_EXEC | _PAGE_ENC)
 223#define PAGE_KERNEL_VSYSCALL    __pgprot(__PAGE_KERNEL_VSYSCALL | _PAGE_ENC)
 224#define PAGE_KERNEL_VVAR        __pgprot(__PAGE_KERNEL_VVAR | _PAGE_ENC)
 225
 226#define PAGE_KERNEL_IO          __pgprot(__PAGE_KERNEL_IO)
 227#define PAGE_KERNEL_IO_NOCACHE  __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 228
 229#endif  /* __ASSEMBLY__ */
 230
 231/*         xwr */
 232#define __P000  PAGE_NONE
 233#define __P001  PAGE_READONLY
 234#define __P010  PAGE_COPY
 235#define __P011  PAGE_COPY
 236#define __P100  PAGE_READONLY_EXEC
 237#define __P101  PAGE_READONLY_EXEC
 238#define __P110  PAGE_COPY_EXEC
 239#define __P111  PAGE_COPY_EXEC
 240
 241#define __S000  PAGE_NONE
 242#define __S001  PAGE_READONLY
 243#define __S010  PAGE_SHARED
 244#define __S011  PAGE_SHARED
 245#define __S100  PAGE_READONLY_EXEC
 246#define __S101  PAGE_READONLY_EXEC
 247#define __S110  PAGE_SHARED_EXEC
 248#define __S111  PAGE_SHARED_EXEC
 249
 250/*
 251 * early identity mapping  pte attrib macros.
 252 */
 253#ifdef CONFIG_X86_64
 254#define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 255#else
 256#define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 257#define PDE_IDENT_ATTR   0x063          /* PRESENT+RW+DIRTY+ACCESSED */
 258#define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 259#endif
 260
 261#ifdef CONFIG_X86_32
 262# include <asm/pgtable_32_types.h>
 263#else
 264# include <asm/pgtable_64_types.h>
 265#endif
 266
 267#ifndef __ASSEMBLY__
 268
 269#include <linux/types.h>
 270
 271/* Extracts the PFN from a (pte|pmd|pud|pgd)val_t of a 4KB page */
 272#define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
 273
 274/*
 275 *  Extracts the flags from a (pte|pmd|pud|pgd)val_t
 276 *  This includes the protection key value.
 277 */
 278#define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
 279
 280typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
 281
 282typedef struct { pgdval_t pgd; } pgd_t;
 283
 284static inline pgd_t native_make_pgd(pgdval_t val)
 285{
 286        return (pgd_t) { val };
 287}
 288
 289static inline pgdval_t native_pgd_val(pgd_t pgd)
 290{
 291        return pgd.pgd;
 292}
 293
 294static inline pgdval_t pgd_flags(pgd_t pgd)
 295{
 296        return native_pgd_val(pgd) & PTE_FLAGS_MASK;
 297}
 298
 299#if CONFIG_PGTABLE_LEVELS > 4
 300typedef struct { p4dval_t p4d; } p4d_t;
 301
 302static inline p4d_t native_make_p4d(pudval_t val)
 303{
 304        return (p4d_t) { val };
 305}
 306
 307static inline p4dval_t native_p4d_val(p4d_t p4d)
 308{
 309        return p4d.p4d;
 310}
 311#else
 312#include <asm-generic/pgtable-nop4d.h>
 313
 314static inline p4d_t native_make_p4d(pudval_t val)
 315{
 316        return (p4d_t) { .pgd = native_make_pgd((pgdval_t)val) };
 317}
 318
 319static inline p4dval_t native_p4d_val(p4d_t p4d)
 320{
 321        return native_pgd_val(p4d.pgd);
 322}
 323#endif
 324
 325#if CONFIG_PGTABLE_LEVELS > 3
 326typedef struct { pudval_t pud; } pud_t;
 327
 328static inline pud_t native_make_pud(pmdval_t val)
 329{
 330        return (pud_t) { val };
 331}
 332
 333static inline pudval_t native_pud_val(pud_t pud)
 334{
 335        return pud.pud;
 336}
 337#else
 338#include <asm-generic/pgtable-nopud.h>
 339
 340static inline pudval_t native_pud_val(pud_t pud)
 341{
 342        return native_pgd_val(pud.p4d.pgd);
 343}
 344#endif
 345
 346#if CONFIG_PGTABLE_LEVELS > 2
 347typedef struct { pmdval_t pmd; } pmd_t;
 348
 349static inline pmd_t native_make_pmd(pmdval_t val)
 350{
 351        return (pmd_t) { val };
 352}
 353
 354static inline pmdval_t native_pmd_val(pmd_t pmd)
 355{
 356        return pmd.pmd;
 357}
 358#else
 359#include <asm-generic/pgtable-nopmd.h>
 360
 361static inline pmdval_t native_pmd_val(pmd_t pmd)
 362{
 363        return native_pgd_val(pmd.pud.p4d.pgd);
 364}
 365#endif
 366
 367static inline p4dval_t p4d_pfn_mask(p4d_t p4d)
 368{
 369        /* No 512 GiB huge pages yet */
 370        return PTE_PFN_MASK;
 371}
 372
 373static inline p4dval_t p4d_flags_mask(p4d_t p4d)
 374{
 375        return ~p4d_pfn_mask(p4d);
 376}
 377
 378static inline p4dval_t p4d_flags(p4d_t p4d)
 379{
 380        return native_p4d_val(p4d) & p4d_flags_mask(p4d);
 381}
 382
 383static inline pudval_t pud_pfn_mask(pud_t pud)
 384{
 385        if (native_pud_val(pud) & _PAGE_PSE)
 386                return PHYSICAL_PUD_PAGE_MASK;
 387        else
 388                return PTE_PFN_MASK;
 389}
 390
 391static inline pudval_t pud_flags_mask(pud_t pud)
 392{
 393        return ~pud_pfn_mask(pud);
 394}
 395
 396static inline pudval_t pud_flags(pud_t pud)
 397{
 398        return native_pud_val(pud) & pud_flags_mask(pud);
 399}
 400
 401static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
 402{
 403        if (native_pmd_val(pmd) & _PAGE_PSE)
 404                return PHYSICAL_PMD_PAGE_MASK;
 405        else
 406                return PTE_PFN_MASK;
 407}
 408
 409static inline pmdval_t pmd_flags_mask(pmd_t pmd)
 410{
 411        return ~pmd_pfn_mask(pmd);
 412}
 413
 414static inline pmdval_t pmd_flags(pmd_t pmd)
 415{
 416        return native_pmd_val(pmd) & pmd_flags_mask(pmd);
 417}
 418
 419static inline pte_t native_make_pte(pteval_t val)
 420{
 421        return (pte_t) { .pte = val };
 422}
 423
 424static inline pteval_t native_pte_val(pte_t pte)
 425{
 426        return pte.pte;
 427}
 428
 429static inline pteval_t pte_flags(pte_t pte)
 430{
 431        return native_pte_val(pte) & PTE_FLAGS_MASK;
 432}
 433
 434#define pgprot_val(x)   ((x).pgprot)
 435#define __pgprot(x)     ((pgprot_t) { (x) } )
 436
 437extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
 438extern uint8_t __pte2cachemode_tbl[8];
 439
 440#define __pte2cm_idx(cb)                                \
 441        ((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) |          \
 442         (((cb) >> (_PAGE_BIT_PCD - 1)) & 2) |          \
 443         (((cb) >> _PAGE_BIT_PWT) & 1))
 444#define __cm_idx2pte(i)                                 \
 445        ((((i) & 4) << (_PAGE_BIT_PAT - 2)) |           \
 446         (((i) & 2) << (_PAGE_BIT_PCD - 1)) |           \
 447         (((i) & 1) << _PAGE_BIT_PWT))
 448
 449static inline unsigned long cachemode2protval(enum page_cache_mode pcm)
 450{
 451        if (likely(pcm == 0))
 452                return 0;
 453        return __cachemode2pte_tbl[pcm];
 454}
 455static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
 456{
 457        return __pgprot(cachemode2protval(pcm));
 458}
 459static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
 460{
 461        unsigned long masked;
 462
 463        masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
 464        if (likely(masked == 0))
 465                return 0;
 466        return __pte2cachemode_tbl[__pte2cm_idx(masked)];
 467}
 468static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
 469{
 470        pgprotval_t val = pgprot_val(pgprot);
 471        pgprot_t new;
 472
 473        pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 474                ((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 475        return new;
 476}
 477static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
 478{
 479        pgprotval_t val = pgprot_val(pgprot);
 480        pgprot_t new;
 481
 482        pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
 483                          ((val & _PAGE_PAT_LARGE) >>
 484                           (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
 485        return new;
 486}
 487
 488
 489typedef struct page *pgtable_t;
 490
 491extern pteval_t __supported_pte_mask;
 492extern void set_nx(void);
 493extern int nx_enabled;
 494
 495#define pgprot_writecombine     pgprot_writecombine
 496extern pgprot_t pgprot_writecombine(pgprot_t prot);
 497
 498#define pgprot_writethrough     pgprot_writethrough
 499extern pgprot_t pgprot_writethrough(pgprot_t prot);
 500
 501/* Indicate that x86 has its own track and untrack pfn vma functions */
 502#define __HAVE_PFNMAP_TRACKING
 503
 504#define __HAVE_PHYS_MEM_ACCESS_PROT
 505struct file;
 506pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 507                              unsigned long size, pgprot_t vma_prot);
 508
 509/* Install a pte for a particular vaddr in kernel space. */
 510void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 511
 512#ifdef CONFIG_X86_32
 513extern void native_pagetable_init(void);
 514#else
 515#define native_pagetable_init        paging_init
 516#endif
 517
 518struct seq_file;
 519extern void arch_report_meminfo(struct seq_file *m);
 520
 521enum pg_level {
 522        PG_LEVEL_NONE,
 523        PG_LEVEL_4K,
 524        PG_LEVEL_2M,
 525        PG_LEVEL_1G,
 526        PG_LEVEL_512G,
 527        PG_LEVEL_NUM
 528};
 529
 530#ifdef CONFIG_PROC_FS
 531extern void update_page_count(int level, unsigned long pages);
 532#else
 533static inline void update_page_count(int level, unsigned long pages) { }
 534#endif
 535
 536/*
 537 * Helper function that returns the kernel pagetable entry controlling
 538 * the virtual address 'address'. NULL means no pagetable entry present.
 539 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 540 * as a pte too.
 541 */
 542extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 543extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
 544                                    unsigned int *level);
 545extern pmd_t *lookup_pmd_address(unsigned long address);
 546extern phys_addr_t slow_virt_to_phys(void *__address);
 547extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
 548                                   unsigned numpages, unsigned long page_flags);
 549#endif  /* !__ASSEMBLY__ */
 550
 551#endif /* _ASM_X86_PGTABLE_DEFS_H */
 552