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/io.h>
  21 #include <asm/pgtable-bits.h>
  22
  23 struct mm_struct;
  24 struct vm_area_struct;
  25
  26 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
  27 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | (cpu_has_rixi ? 0 : _PAGE_READ) | \
  28                                  _page_cachable_default)
  29 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
  30                                  (cpu_has_rixi ?  _PAGE_NO_EXEC : 0) | _page_cachable_default)
  31 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
  32                                  _page_cachable_default)
  33 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  34                                  _PAGE_GLOBAL | _page_cachable_default)
  35 #define PAGE_KERNEL_NC  __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  36                                  _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
  37 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \
  38                                  _page_cachable_default)
  39 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
  40                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
  41
  42 /*
  43  * If _PAGE_NO_EXEC is not defined, we can't do page protection for
  44  * execute, and consider it to be the same as read. Also, write
  45  * permissions imply read permissions. This is the closest we can get
  46  * by reasonable means..
  47  */
  48
  49 /*
  50  * Dummy values to fill the table in mmap.c
  51  * The real values will be generated at runtime
  52  */
  53 #define __P000 __pgprot(0)
  54 #define __P001 __pgprot(0)
  55 #define __P010 __pgprot(0)
  56 #define __P011 __pgprot(0)
  57 #define __P100 __pgprot(0)
  58 #define __P101 __pgprot(0)
  59 #define __P110 __pgprot(0)
  60 #define __P111 __pgprot(0)
  61
  62 #define __S000 __pgprot(0)
  63 #define __S001 __pgprot(0)
  64 #define __S010 __pgprot(0)
  65 #define __S011 __pgprot(0)
  66 #define __S100 __pgprot(0)
  67 #define __S101 __pgprot(0)
  68 #define __S110 __pgprot(0)
  69 #define __S111 __pgprot(0)
  70
  71 extern unsigned long _page_cachable_default;
  72
  73 /*
  74  * ZERO_PAGE is a global shared page that is always zero; used
  75  * for zero-mapped memory areas etc..
  76  */
  77
  78 extern unsigned long empty_zero_page;
  79 extern unsigned long zero_page_mask;
  80
  81 #define ZERO_PAGE(vaddr) \
  82         (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  83 #define __HAVE_COLOR_ZERO_PAGE
  84
  85 extern void paging_init(void);
  86
  87 /*
  88  * Conversion functions: convert a page and protection to a page entry,
  89  * and a page entry and page directory to the page they refer to.
  90  */
  91 #define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  92
  93 #define __pmd_page(pmd)         (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  94 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
  95 #define pmd_page(pmd)           __pmd_page(pmd)
  96 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
  97
  98 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
  99
 100 #define htw_stop()                                                      \
 101 do {                                                                    \
 102         if (cpu_has_htw)                                                \
 103                 write_c0_pwctl(read_c0_pwctl() &                        \
 104                                ~(1 << MIPS_PWCTL_PWEN_SHIFT));          \
 105 } while(0)
 106
 107 #define htw_start()                                                     \
 108 do {                                                                    \
 109         if (cpu_has_htw)                                                \
 110                 write_c0_pwctl(read_c0_pwctl() |                        \
 111                                (1 << MIPS_PWCTL_PWEN_SHIFT));           \
 112 } while(0)
 113
 114
 115 #define htw_reset()                                                     \
 116 do {                                                                    \
 117         if (cpu_has_htw) {                                              \
 118                 htw_stop();                                             \
 119                 back_to_back_c0_hazard();                               \
 120                 htw_start();                                            \
 121                 back_to_back_c0_hazard();                               \
 122         }                                                               \
 123 } while(0)
 124
 125 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 126
 127 #define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
 128 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 129
 130 static inline void set_pte(pte_t *ptep, pte_t pte)
 131 {
 132         ptep->pte_high = pte.pte_high;
 133         smp_wmb();
 134         ptep->pte_low = pte.pte_low;
 135
 136         if (pte.pte_low & _PAGE_GLOBAL) {
 137                 pte_t *buddy = ptep_buddy(ptep);
 138                 /*
 139                  * Make sure the buddy is global too (if it's !none,
 140                  * it better already be global)
 141                  */
 142                 if (pte_none(*buddy)) {
 143                         buddy->pte_low  |= _PAGE_GLOBAL;
 144                         buddy->pte_high |= _PAGE_GLOBAL;
 145                 }
 146         }
 147 }
 148 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 149
 150 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 151 {
 152         pte_t null = __pte(0);
 153
 154         /* Preserve global status for the pair */
 155         if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 156                 null.pte_low = null.pte_high = _PAGE_GLOBAL;
 157
 158         set_pte_at(mm, addr, ptep, null);
 159         htw_reset();
 160 }
 161 #else
 162
 163 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 164 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 165
 166 /*
 167  * Certain architectures need to do special things when pte's
 168  * within a page table are directly modified.  Thus, the following
 169  * hook is made available.
 170  */
 171 static inline void set_pte(pte_t *ptep, pte_t pteval)
 172 {
 173         *ptep = pteval;
 174 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 175         if (pte_val(pteval) & _PAGE_GLOBAL) {
 176                 pte_t *buddy = ptep_buddy(ptep);
 177                 /*
 178                  * Make sure the buddy is global too (if it's !none,
 179                  * it better already be global)
 180                  */
 181                 if (pte_none(*buddy))
 182                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 183         }
 184 #endif
 185 }
 186 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 187
 188 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 189 {
 190 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 191         /* Preserve global status for the pair */
 192         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 193                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 194         else
 195 #endif
 196                 set_pte_at(mm, addr, ptep, __pte(0));
 197         htw_reset();
 198 }
 199 #endif
 200
 201 /*
 202  * (pmds are folded into puds so this doesn't get actually called,
 203  * but the define is needed for a generic inline function.)
 204  */
 205 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 206
 207 #ifndef __PAGETABLE_PMD_FOLDED
 208 /*
 209  * (puds are folded into pgds so this doesn't get actually called,
 210  * but the define is needed for a generic inline function.)
 211  */
 212 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 213 #endif
 214
 215 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 216 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 217 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 218
 219 /*
 220  * We used to declare this array with size but gcc 3.3 and older are not able
 221  * to find that this expression is a constant, so the size is dropped.
 222  */
 223 extern pgd_t swapper_pg_dir[];
 224
 225 /*
 226  * The following only work if pte_present() is true.
 227  * Undefined behaviour if not..
 228  */
 229 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 230 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 231 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 232 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 233 static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 234
 235 static inline pte_t pte_wrprotect(pte_t pte)
 236 {
 237         pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 238         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 239         return pte;
 240 }
 241
 242 static inline pte_t pte_mkclean(pte_t pte)
 243 {
 244         pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 245         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 246         return pte;
 247 }
 248
 249 static inline pte_t pte_mkold(pte_t pte)
 250 {
 251         pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 252         pte.pte_high &= ~_PAGE_SILENT_READ;
 253         return pte;
 254 }
 255
 256 static inline pte_t pte_mkwrite(pte_t pte)
 257 {
 258         pte.pte_low |= _PAGE_WRITE;
 259         if (pte.pte_low & _PAGE_MODIFIED) {
 260                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 261                 pte.pte_high |= _PAGE_SILENT_WRITE;
 262         }
 263         return pte;
 264 }
 265
 266 static inline pte_t pte_mkdirty(pte_t pte)
 267 {
 268         pte.pte_low |= _PAGE_MODIFIED;
 269         if (pte.pte_low & _PAGE_WRITE) {
 270                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 271                 pte.pte_high |= _PAGE_SILENT_WRITE;
 272         }
 273         return pte;
 274 }
 275
 276 static inline pte_t pte_mkyoung(pte_t pte)
 277 {
 278         pte.pte_low |= _PAGE_ACCESSED;
 279         if (pte.pte_low & _PAGE_READ) {
 280                 pte.pte_low  |= _PAGE_SILENT_READ;
 281                 pte.pte_high |= _PAGE_SILENT_READ;
 282         }
 283         return pte;
 284 }
 285 #else
 286 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 287 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 288 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 289 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 290
 291 static inline pte_t pte_wrprotect(pte_t pte)
 292 {
 293         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 294         return pte;
 295 }
 296
 297 static inline pte_t pte_mkclean(pte_t pte)
 298 {
 299         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 300         return pte;
 301 }
 302
 303 static inline pte_t pte_mkold(pte_t pte)
 304 {
 305         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 306         return pte;
 307 }
 308
 309 static inline pte_t pte_mkwrite(pte_t pte)
 310 {
 311         pte_val(pte) |= _PAGE_WRITE;
 312         if (pte_val(pte) & _PAGE_MODIFIED)
 313                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 314         return pte;
 315 }
 316
 317 static inline pte_t pte_mkdirty(pte_t pte)
 318 {
 319         pte_val(pte) |= _PAGE_MODIFIED;
 320         if (pte_val(pte) & _PAGE_WRITE)
 321                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 322         return pte;
 323 }
 324
 325 static inline pte_t pte_mkyoung(pte_t pte)
 326 {
 327         pte_val(pte) |= _PAGE_ACCESSED;
 328         if (cpu_has_rixi) {
 329                 if (!(pte_val(pte) & _PAGE_NO_READ))
 330                         pte_val(pte) |= _PAGE_SILENT_READ;
 331         } else {
 332                 if (pte_val(pte) & _PAGE_READ)
 333                         pte_val(pte) |= _PAGE_SILENT_READ;
 334         }
 335         return pte;
 336 }
 337
 338 #ifdef _PAGE_HUGE
 339 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 340
 341 static inline pte_t pte_mkhuge(pte_t pte)
 342 {
 343         pte_val(pte) |= _PAGE_HUGE;
 344         return pte;
 345 }
 346 #endif /* _PAGE_HUGE */
 347 #endif
 348 static inline int pte_special(pte_t pte)        { return 0; }
 349 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 350
 351 /*
 352  * Macro to make mark a page protection value as "uncacheable".  Note
 353  * that "protection" is really a misnomer here as the protection value
 354  * contains the memory attribute bits, dirty bits, and various other
 355  * bits as well.
 356  */
 357 #define pgprot_noncached pgprot_noncached
 358
 359 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 360 {
 361         unsigned long prot = pgprot_val(_prot);
 362
 363         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 364
 365         return __pgprot(prot);
 366 }
 367
 368 /*
 369  * Conversion functions: convert a page and protection to a page entry,
 370  * and a page entry and page directory to the page they refer to.
 371  */
 372 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 373
 374 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 375 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 376 {
 377         pte.pte_low  &= _PAGE_CHG_MASK;
 378         pte.pte_high &= ~0x3f;
 379         pte.pte_low  |= pgprot_val(newprot);
 380         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 381         return pte;
 382 }
 383 #else
 384 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 385 {
 386         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 387 }
 388 #endif
 389
 390
 391 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 392         pte_t pte);
 393 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 394         pte_t pte);
 395
 396 static inline void update_mmu_cache(struct vm_area_struct *vma,
 397         unsigned long address, pte_t *ptep)
 398 {
 399         pte_t pte = *ptep;
 400         __update_tlb(vma, address, pte);
 401         __update_cache(vma, address, pte);
 402 }
 403
 404 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 405         unsigned long address, pmd_t *pmdp)
 406 {
 407         pte_t pte = *(pte_t *)pmdp;
 408
 409         __update_tlb(vma, address, pte);
 410 }
 411
 412 #define kern_addr_valid(addr)   (1)
 413
 414 #ifdef CONFIG_64BIT_PHYS_ADDR
 415 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 416
 417 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 418                 unsigned long vaddr,
 419                 unsigned long pfn,
 420                 unsigned long size,
 421                 pgprot_t prot)
 422 {
 423         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 424         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 425 }
 426 #define io_remap_pfn_range io_remap_pfn_range
 427 #endif
 428
 429 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 430
 431 extern int has_transparent_hugepage(void);
 432
 433 static inline int pmd_trans_huge(pmd_t pmd)
 434 {
 435         return !!(pmd_val(pmd) & _PAGE_HUGE);
 436 }
 437
 438 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 439 {
 440         pmd_val(pmd) |= _PAGE_HUGE;
 441
 442         return pmd;
 443 }
 444
 445 static inline int pmd_trans_splitting(pmd_t pmd)
 446 {
 447         return !!(pmd_val(pmd) & _PAGE_SPLITTING);
 448 }
 449
 450 static inline pmd_t pmd_mksplitting(pmd_t pmd)
 451 {
 452         pmd_val(pmd) |= _PAGE_SPLITTING;
 453
 454         return pmd;
 455 }
 456
 457 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 458                        pmd_t *pmdp, pmd_t pmd);
 459
 460 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 461 /* Extern to avoid header file madness */
 462 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 463                                         unsigned long address,
 464                                         pmd_t *pmdp);
 465
 466 #define __HAVE_ARCH_PMD_WRITE
 467 static inline int pmd_write(pmd_t pmd)
 468 {
 469         return !!(pmd_val(pmd) & _PAGE_WRITE);
 470 }
 471
 472 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 473 {
 474         pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 475         return pmd;
 476 }
 477
 478 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 479 {
 480         pmd_val(pmd) |= _PAGE_WRITE;
 481         if (pmd_val(pmd) & _PAGE_MODIFIED)
 482                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 483
 484         return pmd;
 485 }
 486
 487 static inline int pmd_dirty(pmd_t pmd)
 488 {
 489         return !!(pmd_val(pmd) & _PAGE_MODIFIED);
 490 }
 491
 492 static inline pmd_t pmd_mkclean(pmd_t pmd)
 493 {
 494         pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 495         return pmd;
 496 }
 497
 498 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 499 {
 500         pmd_val(pmd) |= _PAGE_MODIFIED;
 501         if (pmd_val(pmd) & _PAGE_WRITE)
 502                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 503
 504         return pmd;
 505 }
 506
 507 static inline int pmd_young(pmd_t pmd)
 508 {
 509         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
 510 }
 511
 512 static inline pmd_t pmd_mkold(pmd_t pmd)
 513 {
 514         pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 515
 516         return pmd;
 517 }
 518
 519 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 520 {
 521         pmd_val(pmd) |= _PAGE_ACCESSED;
 522
 523         if (cpu_has_rixi) {
 524                 if (!(pmd_val(pmd) & _PAGE_NO_READ))
 525                         pmd_val(pmd) |= _PAGE_SILENT_READ;
 526         } else {
 527                 if (pmd_val(pmd) & _PAGE_READ)
 528                         pmd_val(pmd) |= _PAGE_SILENT_READ;
 529         }
 530
 531         return pmd;
 532 }
 533
 534 /* Extern to avoid header file madness */
 535 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
 536
 537 static inline unsigned long pmd_pfn(pmd_t pmd)
 538 {
 539         return pmd_val(pmd) >> _PFN_SHIFT;
 540 }
 541
 542 static inline struct page *pmd_page(pmd_t pmd)
 543 {
 544         if (pmd_trans_huge(pmd))
 545                 return pfn_to_page(pmd_pfn(pmd));
 546
 547         return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
 548 }
 549
 550 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 551 {
 552         pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
 553         return pmd;
 554 }
 555
 556 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 557 {
 558         pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
 559
 560         return pmd;
 561 }
 562
 563 /*
 564  * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
 565  * different prototype.
 566  */
 567 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
 568 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
 569                                        unsigned long address, pmd_t *pmdp)
 570 {
 571         pmd_t old = *pmdp;
 572
 573         pmd_clear(pmdp);
 574
 575         return old;
 576 }
 577
 578 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 579
 580 #include <asm-generic/pgtable.h>
 581
 582 /*
 583  * uncached accelerated TLB map for video memory access
 584  */
 585 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
 586 #define __HAVE_PHYS_MEM_ACCESS_PROT
 587
 588 struct file;
 589 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 590                 unsigned long size, pgprot_t vma_prot);
 591 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 592                 unsigned long size, pgprot_t *vma_prot);
 593 #endif
 594
 595 /*
 596  * We provide our own get_unmapped area to cope with the virtual aliasing
 597  * constraints placed on us by the cache architecture.
 598  */
 599 #define HAVE_ARCH_UNMAPPED_AREA
 600 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 601
 602 /*
 603  * No page table caches to initialise
 604  */
 605 #define pgtable_cache_init()    do { } while (0)
 606
 607 #endif /* _ASM_PGTABLE_H */