arch/loongarch/include/asm/pgtable.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   4  *
   5  * Derived from MIPS:
   6  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
   7  * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
   8  */
   9 #ifndef _ASM_PGTABLE_H
  10 #define _ASM_PGTABLE_H
  11
  12 #include <linux/compiler.h>
  13 #include <asm/addrspace.h>
  14 #include <asm/page.h>
  15 #include <asm/pgtable-bits.h>
  16
  17 #if CONFIG_PGTABLE_LEVELS == 2
  18 #include <asm-generic/pgtable-nopmd.h>
  19 #elif CONFIG_PGTABLE_LEVELS == 3
  20 #include <asm-generic/pgtable-nopud.h>
  21 #else
  22 #include <asm-generic/pgtable-nop4d.h>
  23 #endif
  24
  25 #if CONFIG_PGTABLE_LEVELS == 2
  26 #define PGDIR_SHIFT     (PAGE_SHIFT + (PAGE_SHIFT - 3))
  27 #elif CONFIG_PGTABLE_LEVELS == 3
  28 #define PMD_SHIFT       (PAGE_SHIFT + (PAGE_SHIFT - 3))
  29 #define PMD_SIZE        (1UL << PMD_SHIFT)
  30 #define PMD_MASK        (~(PMD_SIZE-1))
  31 #define PGDIR_SHIFT     (PMD_SHIFT + (PAGE_SHIFT - 3))
  32 #elif CONFIG_PGTABLE_LEVELS == 4
  33 #define PMD_SHIFT       (PAGE_SHIFT + (PAGE_SHIFT - 3))
  34 #define PMD_SIZE        (1UL << PMD_SHIFT)
  35 #define PMD_MASK        (~(PMD_SIZE-1))
  36 #define PUD_SHIFT       (PMD_SHIFT + (PAGE_SHIFT - 3))
  37 #define PUD_SIZE        (1UL << PUD_SHIFT)
  38 #define PUD_MASK        (~(PUD_SIZE-1))
  39 #define PGDIR_SHIFT     (PUD_SHIFT + (PAGE_SHIFT - 3))
  40 #endif
  41
  42 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  43 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  44
  45 #define VA_BITS         (PGDIR_SHIFT + (PAGE_SHIFT - 3))
  46
  47 #define PTRS_PER_PGD    (PAGE_SIZE >> 3)
  48 #if CONFIG_PGTABLE_LEVELS > 3
  49 #define PTRS_PER_PUD    (PAGE_SIZE >> 3)
  50 #endif
  51 #if CONFIG_PGTABLE_LEVELS > 2
  52 #define PTRS_PER_PMD    (PAGE_SIZE >> 3)
  53 #endif
  54 #define PTRS_PER_PTE    (PAGE_SIZE >> 3)
  55
  56 #define USER_PTRS_PER_PGD       ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
  57
  58 #ifndef __ASSEMBLY__
  59
  60 #include <linux/mm_types.h>
  61 #include <linux/mmzone.h>
  62 #include <asm/fixmap.h>
  63 #include <asm/sparsemem.h>
  64
  65 struct mm_struct;
  66 struct vm_area_struct;
  67
  68 /*
  69  * ZERO_PAGE is a global shared page that is always zero; used
  70  * for zero-mapped memory areas etc..
  71  */
  72
  73 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
  74
  75 #define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  76
  77 /*
  78  * TLB refill handlers may also map the vmalloc area into xkvrange.
  79  * Avoid the first couple of pages so NULL pointer dereferences will
  80  * still reliably trap.
  81  */
  82 #define MODULES_VADDR   (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
  83 #define MODULES_END     (MODULES_VADDR + SZ_256M)
  84
  85 #ifdef CONFIG_KFENCE
  86 #define KFENCE_AREA_SIZE        (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE)
  87 #else
  88 #define KFENCE_AREA_SIZE        0
  89 #endif
  90
  91 #define VMALLOC_START   MODULES_END
  92
  93 #ifndef CONFIG_KASAN
  94 #define VMALLOC_END     \
  95         (vm_map_base +  \
  96          min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE)
  97 #else
  98 #define VMALLOC_END     \
  99         (vm_map_base +  \
 100          min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits) / 2) - PMD_SIZE - VMEMMAP_SIZE - KFENCE_AREA_SIZE)
 101 #endif
 102
 103 #define vmemmap         ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK))
 104 #define VMEMMAP_END     ((unsigned long)vmemmap + VMEMMAP_SIZE - 1)
 105
 106 #define KFENCE_AREA_START       (VMEMMAP_END + 1)
 107 #define KFENCE_AREA_END         (KFENCE_AREA_START + KFENCE_AREA_SIZE - 1)
 108
 109 #define ptep_get(ptep) READ_ONCE(*(ptep))
 110 #define pmdp_get(pmdp) READ_ONCE(*(pmdp))
 111
 112 #define pte_ERROR(e) \
 113         pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
 114 #ifndef __PAGETABLE_PMD_FOLDED
 115 #define pmd_ERROR(e) \
 116         pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
 117 #endif
 118 #ifndef __PAGETABLE_PUD_FOLDED
 119 #define pud_ERROR(e) \
 120         pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
 121 #endif
 122 #define pgd_ERROR(e) \
 123         pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
 124
 125 extern pte_t invalid_pte_table[PTRS_PER_PTE];
 126
 127 #ifndef __PAGETABLE_PUD_FOLDED
 128
 129 typedef struct { unsigned long pud; } pud_t;
 130 #define pud_val(x)      ((x).pud)
 131 #define __pud(x)        ((pud_t) { (x) })
 132
 133 extern pud_t invalid_pud_table[PTRS_PER_PUD];
 134
 135 /*
 136  * Empty pgd/p4d entries point to the invalid_pud_table.
 137  */
 138 static inline int p4d_none(p4d_t p4d)
 139 {
 140         return p4d_val(p4d) == (unsigned long)invalid_pud_table;
 141 }
 142
 143 static inline int p4d_bad(p4d_t p4d)
 144 {
 145         return p4d_val(p4d) & ~PAGE_MASK;
 146 }
 147
 148 static inline int p4d_present(p4d_t p4d)
 149 {
 150         return p4d_val(p4d) != (unsigned long)invalid_pud_table;
 151 }
 152
 153 static inline pud_t *p4d_pgtable(p4d_t p4d)
 154 {
 155         return (pud_t *)p4d_val(p4d);
 156 }
 157
 158 static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
 159 {
 160         WRITE_ONCE(*p4d, p4dval);
 161 }
 162
 163 static inline void p4d_clear(p4d_t *p4dp)
 164 {
 165         set_p4d(p4dp, __p4d((unsigned long)invalid_pud_table));
 166 }
 167
 168 #define p4d_phys(p4d)           PHYSADDR(p4d_val(p4d))
 169 #define p4d_page(p4d)           (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
 170
 171 #endif
 172
 173 #ifndef __PAGETABLE_PMD_FOLDED
 174
 175 typedef struct { unsigned long pmd; } pmd_t;
 176 #define pmd_val(x)      ((x).pmd)
 177 #define __pmd(x)        ((pmd_t) { (x) })
 178
 179 extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
 180
 181 /*
 182  * Empty pud entries point to the invalid_pmd_table.
 183  */
 184 static inline int pud_none(pud_t pud)
 185 {
 186         return pud_val(pud) == (unsigned long)invalid_pmd_table;
 187 }
 188
 189 static inline int pud_bad(pud_t pud)
 190 {
 191         return pud_val(pud) & ~PAGE_MASK;
 192 }
 193
 194 static inline int pud_present(pud_t pud)
 195 {
 196         return pud_val(pud) != (unsigned long)invalid_pmd_table;
 197 }
 198
 199 static inline pmd_t *pud_pgtable(pud_t pud)
 200 {
 201         return (pmd_t *)pud_val(pud);
 202 }
 203
 204 static inline void set_pud(pud_t *pud, pud_t pudval)
 205 {
 206         WRITE_ONCE(*pud, pudval);
 207 }
 208
 209 static inline void pud_clear(pud_t *pudp)
 210 {
 211         set_pud(pudp, __pud((unsigned long)invalid_pmd_table));
 212 }
 213
 214 #define pud_phys(pud)           PHYSADDR(pud_val(pud))
 215 #define pud_page(pud)           (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
 216
 217 #endif
 218
 219 /*
 220  * Empty pmd entries point to the invalid_pte_table.
 221  */
 222 static inline int pmd_none(pmd_t pmd)
 223 {
 224         return pmd_val(pmd) == (unsigned long)invalid_pte_table;
 225 }
 226
 227 static inline int pmd_bad(pmd_t pmd)
 228 {
 229         return (pmd_val(pmd) & ~PAGE_MASK);
 230 }
 231
 232 static inline int pmd_present(pmd_t pmd)
 233 {
 234         if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
 235                 return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID));
 236
 237         return pmd_val(pmd) != (unsigned long)invalid_pte_table;
 238 }
 239
 240 static inline void set_pmd(pmd_t *pmd, pmd_t pmdval)
 241 {
 242         WRITE_ONCE(*pmd, pmdval);
 243 }
 244
 245 static inline void pmd_clear(pmd_t *pmdp)
 246 {
 247         set_pmd(pmdp, __pmd((unsigned long)invalid_pte_table));
 248 }
 249
 250 #define pmd_phys(pmd)           PHYSADDR(pmd_val(pmd))
 251
 252 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
 253 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 254 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
 255
 256 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
 257
 258 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
 259 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd);
 260
 261 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 262 #define pte_pfn(x)              ((unsigned long)(((x).pte & _PFN_MASK) >> PFN_PTE_SHIFT))
 263 #define pfn_pte(pfn, prot)      __pte(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
 264 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PFN_PTE_SHIFT) | pgprot_val(prot))
 265
 266 /*
 267  * Initialize a new pgd / pud / pmd table with invalid pointers.
 268  */
 269 extern void pgd_init(void *addr);
 270 extern void pud_init(void *addr);
 271 #define pud_init pud_init
 272 extern void pmd_init(void *addr);
 273 #define pmd_init pmd_init
 274 extern void kernel_pte_init(void *addr);
 275 #define kernel_pte_init kernel_pte_init
 276
 277 /*
 278  * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
 279  * are !pte_none() && !pte_present().
 280  *
 281  * Format of swap PTEs:
 282  *
 283  *   6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3
 284  *   3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2
 285  *   <--------------------------- offset ---------------------------
 286  *
 287  *   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
 288  *   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 289  *   --------------> E <--- type ---> <---------- zeroes ---------->
 290  *
 291  *   E is the exclusive marker that is not stored in swap entries.
 292  *   The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE.
 293  */
 294 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
 295 { pte_t pte; pte_val(pte) = ((type & 0x7f) << 16) | (offset << 24); return pte; }
 296
 297 #define __swp_type(x)           (((x).val >> 16) & 0x7f)
 298 #define __swp_offset(x)         ((x).val >> 24)
 299 #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
 300 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 301 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 302 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
 303 #define __swp_entry_to_pmd(x)   ((pmd_t) { (x).val | _PAGE_HUGE })
 304
 305 static inline int pte_swp_exclusive(pte_t pte)
 306 {
 307         return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
 308 }
 309
 310 static inline pte_t pte_swp_mkexclusive(pte_t pte)
 311 {
 312         pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
 313         return pte;
 314 }
 315
 316 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
 317 {
 318         pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
 319         return pte;
 320 }
 321
 322 extern void paging_init(void);
 323
 324 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 325 #define pte_present(pte)        (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 326 #define pte_no_exec(pte)        (pte_val(pte) & _PAGE_NO_EXEC)
 327
 328 static inline void set_pte(pte_t *ptep, pte_t pteval)
 329 {
 330         WRITE_ONCE(*ptep, pteval);
 331
 332 #ifdef CONFIG_SMP
 333         if (pte_val(pteval) & _PAGE_GLOBAL)
 334                 DBAR(0b11000); /* o_wrw = 0b11000 */
 335 #endif
 336 }
 337
 338 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 339 {
 340         pte_t pte = ptep_get(ptep);
 341         pte_val(pte) &= _PAGE_GLOBAL;
 342         set_pte(ptep, pte);
 343 }
 344
 345 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 346 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 347 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 348
 349 extern pgd_t swapper_pg_dir[];
 350 extern pgd_t invalid_pg_dir[];
 351
 352 /*
 353  * The following only work if pte_present() is true.
 354  * Undefined behaviour if not..
 355  */
 356 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 357 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 358 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & (_PAGE_DIRTY | _PAGE_MODIFIED); }
 359
 360 static inline pte_t pte_mkold(pte_t pte)
 361 {
 362         pte_val(pte) &= ~_PAGE_ACCESSED;
 363         return pte;
 364 }
 365
 366 static inline pte_t pte_mkyoung(pte_t pte)
 367 {
 368         pte_val(pte) |= _PAGE_ACCESSED;
 369         return pte;
 370 }
 371
 372 static inline pte_t pte_mkclean(pte_t pte)
 373 {
 374         pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
 375         return pte;
 376 }
 377
 378 static inline pte_t pte_mkdirty(pte_t pte)
 379 {
 380         pte_val(pte) |= _PAGE_MODIFIED;
 381         if (pte_val(pte) & _PAGE_WRITE)
 382                 pte_val(pte) |= _PAGE_DIRTY;
 383         return pte;
 384 }
 385
 386 static inline pte_t pte_mkwrite_novma(pte_t pte)
 387 {
 388         pte_val(pte) |= _PAGE_WRITE;
 389         if (pte_val(pte) & _PAGE_MODIFIED)
 390                 pte_val(pte) |= _PAGE_DIRTY;
 391         return pte;
 392 }
 393
 394 static inline pte_t pte_wrprotect(pte_t pte)
 395 {
 396         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
 397         return pte;
 398 }
 399
 400 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 401
 402 static inline pte_t pte_mkhuge(pte_t pte)
 403 {
 404         pte_val(pte) |= _PAGE_HUGE;
 405         return pte;
 406 }
 407
 408 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
 409 static inline int pte_special(pte_t pte)        { return pte_val(pte) & _PAGE_SPECIAL; }
 410 static inline pte_t pte_mkspecial(pte_t pte)    { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
 411 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 412
 413 static inline int pte_devmap(pte_t pte)         { return !!(pte_val(pte) & _PAGE_DEVMAP); }
 414 static inline pte_t pte_mkdevmap(pte_t pte)     { pte_val(pte) |= _PAGE_DEVMAP; return pte; }
 415
 416 #define pte_accessible pte_accessible
 417 static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
 418 {
 419         if (pte_val(a) & _PAGE_PRESENT)
 420                 return true;
 421
 422         if ((pte_val(a) & _PAGE_PROTNONE) &&
 423                         atomic_read(&mm->tlb_flush_pending))
 424                 return true;
 425
 426         return false;
 427 }
 428
 429 /*
 430  * Conversion functions: convert a page and protection to a page entry,
 431  * and a page entry and page directory to the page they refer to.
 432  */
 433 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 434
 435 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 436 {
 437         return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
 438                      (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
 439 }
 440
 441 extern void __update_tlb(struct vm_area_struct *vma,
 442                         unsigned long address, pte_t *ptep);
 443
 444 static inline void update_mmu_cache_range(struct vm_fault *vmf,
 445                 struct vm_area_struct *vma, unsigned long address,
 446                 pte_t *ptep, unsigned int nr)
 447 {
 448         for (;;) {
 449                 __update_tlb(vma, address, ptep);
 450                 if (--nr == 0)
 451                         break;
 452                 address += PAGE_SIZE;
 453                 ptep++;
 454         }
 455 }
 456 #define update_mmu_cache(vma, addr, ptep) \
 457         update_mmu_cache_range(NULL, vma, addr, ptep, 1)
 458
 459 #define update_mmu_tlb_range(vma, addr, ptep, nr) \
 460         update_mmu_cache_range(NULL, vma, addr, ptep, nr)
 461
 462 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 463                         unsigned long address, pmd_t *pmdp)
 464 {
 465         __update_tlb(vma, address, (pte_t *)pmdp);
 466 }
 467
 468 static inline unsigned long pmd_pfn(pmd_t pmd)
 469 {
 470         return (pmd_val(pmd) & _PFN_MASK) >> PFN_PTE_SHIFT;
 471 }
 472
 473 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 474
 475 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
 476 #define pmdp_establish generic_pmdp_establish
 477
 478 static inline int pmd_trans_huge(pmd_t pmd)
 479 {
 480         return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
 481 }
 482
 483 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 484 {
 485         pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) |
 486                 ((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
 487         pmd_val(pmd) |= _PAGE_HUGE;
 488
 489         return pmd;
 490 }
 491
 492 #define pmd_write pmd_write
 493 static inline int pmd_write(pmd_t pmd)
 494 {
 495         return !!(pmd_val(pmd) & _PAGE_WRITE);
 496 }
 497
 498 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
 499 {
 500         pmd_val(pmd) |= _PAGE_WRITE;
 501         if (pmd_val(pmd) & _PAGE_MODIFIED)
 502                 pmd_val(pmd) |= _PAGE_DIRTY;
 503         return pmd;
 504 }
 505
 506 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 507 {
 508         pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
 509         return pmd;
 510 }
 511
 512 #define pmd_dirty pmd_dirty
 513 static inline int pmd_dirty(pmd_t pmd)
 514 {
 515         return !!(pmd_val(pmd) & (_PAGE_DIRTY | _PAGE_MODIFIED));
 516 }
 517
 518 static inline pmd_t pmd_mkclean(pmd_t pmd)
 519 {
 520         pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
 521         return pmd;
 522 }
 523
 524 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 525 {
 526         pmd_val(pmd) |= _PAGE_MODIFIED;
 527         if (pmd_val(pmd) & _PAGE_WRITE)
 528                 pmd_val(pmd) |= _PAGE_DIRTY;
 529         return pmd;
 530 }
 531
 532 #define pmd_young pmd_young
 533 static inline int pmd_young(pmd_t pmd)
 534 {
 535         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
 536 }
 537
 538 static inline pmd_t pmd_mkold(pmd_t pmd)
 539 {
 540         pmd_val(pmd) &= ~_PAGE_ACCESSED;
 541         return pmd;
 542 }
 543
 544 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 545 {
 546         pmd_val(pmd) |= _PAGE_ACCESSED;
 547         return pmd;
 548 }
 549
 550 static inline int pmd_devmap(pmd_t pmd)
 551 {
 552         return !!(pmd_val(pmd) & _PAGE_DEVMAP);
 553 }
 554
 555 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
 556 {
 557         pmd_val(pmd) |= _PAGE_DEVMAP;
 558         return pmd;
 559 }
 560
 561 static inline struct page *pmd_page(pmd_t pmd)
 562 {
 563         if (pmd_trans_huge(pmd))
 564                 return pfn_to_page(pmd_pfn(pmd));
 565
 566         return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
 567 }
 568
 569 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 570 {
 571         pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) |
 572                                 (pgprot_val(newprot) & ~_HPAGE_CHG_MASK);
 573         return pmd;
 574 }
 575
 576 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
 577 {
 578         pmd_val(pmd) |= _PAGE_PRESENT_INVALID;
 579         pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
 580
 581         return pmd;
 582 }
 583
 584 /*
 585  * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
 586  * different prototype.
 587  */
 588 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
 589 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
 590                                             unsigned long address, pmd_t *pmdp)
 591 {
 592         pmd_t old = pmdp_get(pmdp);
 593
 594         pmd_clear(pmdp);
 595
 596         return old;
 597 }
 598
 599 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 600
 601 #ifdef CONFIG_NUMA_BALANCING
 602 static inline long pte_protnone(pte_t pte)
 603 {
 604         return (pte_val(pte) & _PAGE_PROTNONE);
 605 }
 606
 607 static inline long pmd_protnone(pmd_t pmd)
 608 {
 609         return (pmd_val(pmd) & _PAGE_PROTNONE);
 610 }
 611 #endif /* CONFIG_NUMA_BALANCING */
 612
 613 #define pmd_leaf(pmd)           ((pmd_val(pmd) & _PAGE_HUGE) != 0)
 614 #define pud_leaf(pud)           ((pud_val(pud) & _PAGE_HUGE) != 0)
 615
 616 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 617 #define pud_devmap(pud)         (0)
 618 #define pgd_devmap(pgd)         (0)
 619 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 620
 621 /*
 622  * We provide our own get_unmapped area to cope with the virtual aliasing
 623  * constraints placed on us by the cache architecture.
 624  */
 625 #define HAVE_ARCH_UNMAPPED_AREA
 626 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 627
 628 #endif /* !__ASSEMBLY__ */
 629
 630 #endif /* _ASM_PGTABLE_H */