arch/mips/include/asm/pgtable.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2003 Ralf Baechle
   7  */
   8 #ifndef _ASM_PGTABLE_H
   9 #define _ASM_PGTABLE_H
  10
  11 #include <linux/mm_types.h>
  12 #include <linux/mmzone.h>
  13 #ifdef CONFIG_32BIT
  14 #include <asm/pgtable-32.h>
  15 #endif
  16 #ifdef CONFIG_64BIT
  17 #include <asm/pgtable-64.h>
  18 #endif
  19
  20 #include <asm/cmpxchg.h>
  21 #include <asm/io.h>
  22 #include <asm/pgtable-bits.h>
  23 #include <asm/cpu-features.h>
  24
  25 struct mm_struct;
  26 struct vm_area_struct;
  27
  28 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \
  29                                  _page_cachable_default)
  30 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
  31                                  _page_cachable_default)
  32 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \
  33                                  _page_cachable_default)
  34 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | \
  35                                  _page_cachable_default)
  36 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  37                                  _PAGE_GLOBAL | _page_cachable_default)
  38 #define PAGE_KERNEL_NC  __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  39                                  _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
  40 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
  41                                  _page_cachable_default)
  42 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
  43                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
  44
  45 /*
  46  * If _PAGE_NO_EXEC is not defined, we can't do page protection for
  47  * execute, and consider it to be the same as read. Also, write
  48  * permissions imply read permissions. This is the closest we can get
  49  * by reasonable means..
  50  */
  51
  52 /*
  53  * Dummy values to fill the table in mmap.c
  54  * The real values will be generated at runtime
  55  */
  56 #define __P000 __pgprot(0)
  57 #define __P001 __pgprot(0)
  58 #define __P010 __pgprot(0)
  59 #define __P011 __pgprot(0)
  60 #define __P100 __pgprot(0)
  61 #define __P101 __pgprot(0)
  62 #define __P110 __pgprot(0)
  63 #define __P111 __pgprot(0)
  64
  65 #define __S000 __pgprot(0)
  66 #define __S001 __pgprot(0)
  67 #define __S010 __pgprot(0)
  68 #define __S011 __pgprot(0)
  69 #define __S100 __pgprot(0)
  70 #define __S101 __pgprot(0)
  71 #define __S110 __pgprot(0)
  72 #define __S111 __pgprot(0)
  73
  74 extern unsigned long _page_cachable_default;
  75
  76 /*
  77  * ZERO_PAGE is a global shared page that is always zero; used
  78  * for zero-mapped memory areas etc..
  79  */
  80
  81 extern unsigned long empty_zero_page;
  82 extern unsigned long zero_page_mask;
  83
  84 #define ZERO_PAGE(vaddr) \
  85         (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  86 #define __HAVE_COLOR_ZERO_PAGE
  87
  88 extern void paging_init(void);
  89
  90 /*
  91  * Conversion functions: convert a page and protection to a page entry,
  92  * and a page entry and page directory to the page they refer to.
  93  */
  94 #define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  95
  96 #define __pmd_page(pmd)         (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  97 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
  98 #define pmd_page(pmd)           __pmd_page(pmd)
  99 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
 100
 101 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
 102
 103 #define htw_stop()                                                      \
 104 do {                                                                    \
 105         unsigned long flags;                                            \
 106                                                                         \
 107         if (cpu_has_htw) {                                              \
 108                 local_irq_save(flags);                                  \
 109                 if(!raw_current_cpu_data.htw_seq++) {                   \
 110                         write_c0_pwctl(read_c0_pwctl() &                \
 111                                        ~(1 << MIPS_PWCTL_PWEN_SHIFT));  \
 112                         back_to_back_c0_hazard();                       \
 113                 }                                                       \
 114                 local_irq_restore(flags);                               \
 115         }                                                               \
 116 } while(0)
 117
 118 #define htw_start()                                                     \
 119 do {                                                                    \
 120         unsigned long flags;                                            \
 121                                                                         \
 122         if (cpu_has_htw) {                                              \
 123                 local_irq_save(flags);                                  \
 124                 if (!--raw_current_cpu_data.htw_seq) {                  \
 125                         write_c0_pwctl(read_c0_pwctl() |                \
 126                                        (1 << MIPS_PWCTL_PWEN_SHIFT));   \
 127                         back_to_back_c0_hazard();                       \
 128                 }                                                       \
 129                 local_irq_restore(flags);                               \
 130         }                                                               \
 131 } while(0)
 132
 133 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 134                               pte_t *ptep, pte_t pteval);
 135
 136 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 137
 138 #ifdef CONFIG_XPA
 139 # define pte_none(pte)          (!(((pte).pte_high) & ~_PAGE_GLOBAL))
 140 #else
 141 # define pte_none(pte)          (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
 142 #endif
 143
 144 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 145 #define pte_no_exec(pte)        ((pte).pte_low & _PAGE_NO_EXEC)
 146
 147 static inline void set_pte(pte_t *ptep, pte_t pte)
 148 {
 149         ptep->pte_high = pte.pte_high;
 150         smp_wmb();
 151         ptep->pte_low = pte.pte_low;
 152
 153 #ifdef CONFIG_XPA
 154         if (pte.pte_high & _PAGE_GLOBAL) {
 155 #else
 156         if (pte.pte_low & _PAGE_GLOBAL) {
 157 #endif
 158                 pte_t *buddy = ptep_buddy(ptep);
 159                 /*
 160                  * Make sure the buddy is global too (if it's !none,
 161                  * it better already be global)
 162                  */
 163                 if (pte_none(*buddy)) {
 164                         if (!IS_ENABLED(CONFIG_XPA))
 165                                 buddy->pte_low |= _PAGE_GLOBAL;
 166                         buddy->pte_high |= _PAGE_GLOBAL;
 167                 }
 168         }
 169 }
 170
 171 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 172 {
 173         pte_t null = __pte(0);
 174
 175         htw_stop();
 176         /* Preserve global status for the pair */
 177         if (IS_ENABLED(CONFIG_XPA)) {
 178                 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
 179                         null.pte_high = _PAGE_GLOBAL;
 180         } else {
 181                 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 182                         null.pte_low = null.pte_high = _PAGE_GLOBAL;
 183         }
 184
 185         set_pte_at(mm, addr, ptep, null);
 186         htw_start();
 187 }
 188 #else
 189
 190 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 191 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 192 #define pte_no_exec(pte)        (pte_val(pte) & _PAGE_NO_EXEC)
 193
 194 /*
 195  * Certain architectures need to do special things when pte's
 196  * within a page table are directly modified.  Thus, the following
 197  * hook is made available.
 198  */
 199 static inline void set_pte(pte_t *ptep, pte_t pteval)
 200 {
 201         *ptep = pteval;
 202 #if !defined(CONFIG_CPU_R3K_TLB)
 203         if (pte_val(pteval) & _PAGE_GLOBAL) {
 204                 pte_t *buddy = ptep_buddy(ptep);
 205                 /*
 206                  * Make sure the buddy is global too (if it's !none,
 207                  * it better already be global)
 208                  */
 209 # if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32)
 210                 cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
 211 # else
 212                 cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL);
 213 # endif
 214         }
 215 #endif
 216 }
 217
 218 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 219 {
 220         htw_stop();
 221 #if !defined(CONFIG_CPU_R3K_TLB)
 222         /* Preserve global status for the pair */
 223         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 224                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 225         else
 226 #endif
 227                 set_pte_at(mm, addr, ptep, __pte(0));
 228         htw_start();
 229 }
 230 #endif
 231
 232 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 233                               pte_t *ptep, pte_t pteval)
 234 {
 235         extern void __update_cache(unsigned long address, pte_t pte);
 236
 237         if (!pte_present(pteval))
 238                 goto cache_sync_done;
 239
 240         if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
 241                 goto cache_sync_done;
 242
 243         __update_cache(addr, pteval);
 244 cache_sync_done:
 245         set_pte(ptep, pteval);
 246 }
 247
 248 /*
 249  * (pmds are folded into puds so this doesn't get actually called,
 250  * but the define is needed for a generic inline function.)
 251  */
 252 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 253
 254 #ifndef __PAGETABLE_PMD_FOLDED
 255 /*
 256  * (puds are folded into pgds so this doesn't get actually called,
 257  * but the define is needed for a generic inline function.)
 258  */
 259 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 260 #endif
 261
 262 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 263 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 264 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 265
 266 /*
 267  * We used to declare this array with size but gcc 3.3 and older are not able
 268  * to find that this expression is a constant, so the size is dropped.
 269  */
 270 extern pgd_t swapper_pg_dir[];
 271
 272 /*
 273  * Platform specific pte_special() and pte_mkspecial() definitions
 274  * are required only when ARCH_HAS_PTE_SPECIAL is enabled.
 275  */
 276 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
 277 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 278 static inline int pte_special(pte_t pte)
 279 {
 280         return pte.pte_low & _PAGE_SPECIAL;
 281 }
 282
 283 static inline pte_t pte_mkspecial(pte_t pte)
 284 {
 285         pte.pte_low |= _PAGE_SPECIAL;
 286         return pte;
 287 }
 288 #else
 289 static inline int pte_special(pte_t pte)
 290 {
 291         return pte_val(pte) & _PAGE_SPECIAL;
 292 }
 293
 294 static inline pte_t pte_mkspecial(pte_t pte)
 295 {
 296         pte_val(pte) |= _PAGE_SPECIAL;
 297         return pte;
 298 }
 299 #endif
 300 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
 301
 302 /*
 303  * The following only work if pte_present() is true.
 304  * Undefined behaviour if not..
 305  */
 306 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 307 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 308 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 309 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 310
 311 static inline pte_t pte_wrprotect(pte_t pte)
 312 {
 313         pte.pte_low  &= ~_PAGE_WRITE;
 314         if (!IS_ENABLED(CONFIG_XPA))
 315                 pte.pte_low &= ~_PAGE_SILENT_WRITE;
 316         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 317         return pte;
 318 }
 319
 320 static inline pte_t pte_mkclean(pte_t pte)
 321 {
 322         pte.pte_low  &= ~_PAGE_MODIFIED;
 323         if (!IS_ENABLED(CONFIG_XPA))
 324                 pte.pte_low &= ~_PAGE_SILENT_WRITE;
 325         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 326         return pte;
 327 }
 328
 329 static inline pte_t pte_mkold(pte_t pte)
 330 {
 331         pte.pte_low  &= ~_PAGE_ACCESSED;
 332         if (!IS_ENABLED(CONFIG_XPA))
 333                 pte.pte_low &= ~_PAGE_SILENT_READ;
 334         pte.pte_high &= ~_PAGE_SILENT_READ;
 335         return pte;
 336 }
 337
 338 static inline pte_t pte_mkwrite(pte_t pte)
 339 {
 340         pte.pte_low |= _PAGE_WRITE;
 341         if (pte.pte_low & _PAGE_MODIFIED) {
 342                 if (!IS_ENABLED(CONFIG_XPA))
 343                         pte.pte_low |= _PAGE_SILENT_WRITE;
 344                 pte.pte_high |= _PAGE_SILENT_WRITE;
 345         }
 346         return pte;
 347 }
 348
 349 static inline pte_t pte_mkdirty(pte_t pte)
 350 {
 351         pte.pte_low |= _PAGE_MODIFIED;
 352         if (pte.pte_low & _PAGE_WRITE) {
 353                 if (!IS_ENABLED(CONFIG_XPA))
 354                         pte.pte_low |= _PAGE_SILENT_WRITE;
 355                 pte.pte_high |= _PAGE_SILENT_WRITE;
 356         }
 357         return pte;
 358 }
 359
 360 static inline pte_t pte_mkyoung(pte_t pte)
 361 {
 362         pte.pte_low |= _PAGE_ACCESSED;
 363         if (!(pte.pte_low & _PAGE_NO_READ)) {
 364                 if (!IS_ENABLED(CONFIG_XPA))
 365                         pte.pte_low |= _PAGE_SILENT_READ;
 366                 pte.pte_high |= _PAGE_SILENT_READ;
 367         }
 368         return pte;
 369 }
 370 #else
 371 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 372 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 373 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 374
 375 static inline pte_t pte_wrprotect(pte_t pte)
 376 {
 377         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 378         return pte;
 379 }
 380
 381 static inline pte_t pte_mkclean(pte_t pte)
 382 {
 383         pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 384         return pte;
 385 }
 386
 387 static inline pte_t pte_mkold(pte_t pte)
 388 {
 389         pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 390         return pte;
 391 }
 392
 393 static inline pte_t pte_mkwrite(pte_t pte)
 394 {
 395         pte_val(pte) |= _PAGE_WRITE;
 396         if (pte_val(pte) & _PAGE_MODIFIED)
 397                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 398         return pte;
 399 }
 400
 401 static inline pte_t pte_mkdirty(pte_t pte)
 402 {
 403         pte_val(pte) |= _PAGE_MODIFIED;
 404         if (pte_val(pte) & _PAGE_WRITE)
 405                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 406         return pte;
 407 }
 408
 409 static inline pte_t pte_mkyoung(pte_t pte)
 410 {
 411         pte_val(pte) |= _PAGE_ACCESSED;
 412         if (!(pte_val(pte) & _PAGE_NO_READ))
 413                 pte_val(pte) |= _PAGE_SILENT_READ;
 414         return pte;
 415 }
 416
 417 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
 418 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 419
 420 static inline pte_t pte_mkhuge(pte_t pte)
 421 {
 422         pte_val(pte) |= _PAGE_HUGE;
 423         return pte;
 424 }
 425 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
 426 #endif
 427
 428 /*
 429  * Macro to make mark a page protection value as "uncacheable".  Note
 430  * that "protection" is really a misnomer here as the protection value
 431  * contains the memory attribute bits, dirty bits, and various other
 432  * bits as well.
 433  */
 434 #define pgprot_noncached pgprot_noncached
 435
 436 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 437 {
 438         unsigned long prot = pgprot_val(_prot);
 439
 440         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 441
 442         return __pgprot(prot);
 443 }
 444
 445 #define pgprot_writecombine pgprot_writecombine
 446
 447 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 448 {
 449         unsigned long prot = pgprot_val(_prot);
 450
 451         /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
 452         prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
 453
 454         return __pgprot(prot);
 455 }
 456
 457 /*
 458  * Conversion functions: convert a page and protection to a page entry,
 459  * and a page entry and page directory to the page they refer to.
 460  */
 461 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 462
 463 #if defined(CONFIG_XPA)
 464 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 465 {
 466         pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
 467         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
 468         pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
 469         pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
 470         return pte;
 471 }
 472 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 473 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 474 {
 475         pte.pte_low  &= _PAGE_CHG_MASK;
 476         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
 477         pte.pte_low  |= pgprot_val(newprot);
 478         pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
 479         return pte;
 480 }
 481 #else
 482 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 483 {
 484         return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
 485                      (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
 486 }
 487 #endif
 488
 489
 490 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 491         pte_t pte);
 492
 493 static inline void update_mmu_cache(struct vm_area_struct *vma,
 494         unsigned long address, pte_t *ptep)
 495 {
 496         pte_t pte = *ptep;
 497         __update_tlb(vma, address, pte);
 498 }
 499
 500 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 501         unsigned long address, pmd_t *pmdp)
 502 {
 503         pte_t pte = *(pte_t *)pmdp;
 504
 505         __update_tlb(vma, address, pte);
 506 }
 507
 508 #define kern_addr_valid(addr)   (1)
 509
 510 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 511 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 512
 513 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 514                 unsigned long vaddr,
 515                 unsigned long pfn,
 516                 unsigned long size,
 517                 pgprot_t prot)
 518 {
 519         phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 520         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 521 }
 522 #define io_remap_pfn_range io_remap_pfn_range
 523 #endif
 524
 525 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 526
 527 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
 528 #define pmdp_establish generic_pmdp_establish
 529
 530 #define has_transparent_hugepage has_transparent_hugepage
 531 extern int has_transparent_hugepage(void);
 532
 533 static inline int pmd_trans_huge(pmd_t pmd)
 534 {
 535         return !!(pmd_val(pmd) & _PAGE_HUGE);
 536 }
 537
 538 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 539 {
 540         pmd_val(pmd) |= _PAGE_HUGE;
 541
 542         return pmd;
 543 }
 544
 545 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 546                        pmd_t *pmdp, pmd_t pmd);
 547
 548 #define pmd_write pmd_write
 549 static inline int pmd_write(pmd_t pmd)
 550 {
 551         return !!(pmd_val(pmd) & _PAGE_WRITE);
 552 }
 553
 554 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 555 {
 556         pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 557         return pmd;
 558 }
 559
 560 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 561 {
 562         pmd_val(pmd) |= _PAGE_WRITE;
 563         if (pmd_val(pmd) & _PAGE_MODIFIED)
 564                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 565
 566         return pmd;
 567 }
 568
 569 static inline int pmd_dirty(pmd_t pmd)
 570 {
 571         return !!(pmd_val(pmd) & _PAGE_MODIFIED);
 572 }
 573
 574 static inline pmd_t pmd_mkclean(pmd_t pmd)
 575 {
 576         pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 577         return pmd;
 578 }
 579
 580 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 581 {
 582         pmd_val(pmd) |= _PAGE_MODIFIED;
 583         if (pmd_val(pmd) & _PAGE_WRITE)
 584                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 585
 586         return pmd;
 587 }
 588
 589 static inline int pmd_young(pmd_t pmd)
 590 {
 591         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
 592 }
 593
 594 static inline pmd_t pmd_mkold(pmd_t pmd)
 595 {
 596         pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 597
 598         return pmd;
 599 }
 600
 601 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 602 {
 603         pmd_val(pmd) |= _PAGE_ACCESSED;
 604
 605         if (!(pmd_val(pmd) & _PAGE_NO_READ))
 606                 pmd_val(pmd) |= _PAGE_SILENT_READ;
 607
 608         return pmd;
 609 }
 610
 611 /* Extern to avoid header file madness */
 612 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
 613
 614 static inline unsigned long pmd_pfn(pmd_t pmd)
 615 {
 616         return pmd_val(pmd) >> _PFN_SHIFT;
 617 }
 618
 619 static inline struct page *pmd_page(pmd_t pmd)
 620 {
 621         if (pmd_trans_huge(pmd))
 622                 return pfn_to_page(pmd_pfn(pmd));
 623
 624         return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
 625 }
 626
 627 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 628 {
 629         pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
 630                        (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
 631         return pmd;
 632 }
 633
 634 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 635 {
 636         pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
 637
 638         return pmd;
 639 }
 640
 641 /*
 642  * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
 643  * different prototype.
 644  */
 645 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
 646 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
 647                                             unsigned long address, pmd_t *pmdp)
 648 {
 649         pmd_t old = *pmdp;
 650
 651         pmd_clear(pmdp);
 652
 653         return old;
 654 }
 655
 656 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 657
 658 #ifdef _PAGE_HUGE
 659 #define pmd_leaf(pmd)   ((pmd_val(pmd) & _PAGE_HUGE) != 0)
 660 #define pud_leaf(pud)   ((pud_val(pud) & _PAGE_HUGE) != 0)
 661 #endif
 662
 663 #define gup_fast_permitted(start, end)  (!cpu_has_dc_aliases)
 664
 665 #include <asm-generic/pgtable.h>
 666
 667 /*
 668  * We provide our own get_unmapped area to cope with the virtual aliasing
 669  * constraints placed on us by the cache architecture.
 670  */
 671 #define HAVE_ARCH_UNMAPPED_AREA
 672 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 673
 674 #endif /* _ASM_PGTABLE_H */