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/mmzone.h>
  12 #ifdef CONFIG_32BIT
  13 #include <asm/pgtable-32.h>
  14 #endif
  15 #ifdef CONFIG_64BIT
  16 #include <asm/pgtable-64.h>
  17 #endif
  18
  19 #include <asm/io.h>
  20 #include <asm/pgtable-bits.h>
  21
  22 struct mm_struct;
  23 struct vm_area_struct;
  24
  25 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
  26 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | (cpu_has_rixi ? 0 : _PAGE_READ) | \
  27                                  _page_cachable_default)
  28 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
  29                                  (cpu_has_rixi ?  _PAGE_NO_EXEC : 0) | _page_cachable_default)
  30 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
  31                                  _page_cachable_default)
  32 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  33                                  _PAGE_GLOBAL | _page_cachable_default)
  34 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \
  35                                  _page_cachable_default)
  36 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
  37                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
  38
  39 /*
  40  * If _PAGE_NO_EXEC is not defined, we can't do page protection for
  41  * execute, and consider it to be the same as read. Also, write
  42  * permissions imply read permissions. This is the closest we can get
  43  * by reasonable means..
  44  */
  45
  46 /*
  47  * Dummy values to fill the table in mmap.c
  48  * The real values will be generated at runtime
  49  */
  50 #define __P000 __pgprot(0)
  51 #define __P001 __pgprot(0)
  52 #define __P010 __pgprot(0)
  53 #define __P011 __pgprot(0)
  54 #define __P100 __pgprot(0)
  55 #define __P101 __pgprot(0)
  56 #define __P110 __pgprot(0)
  57 #define __P111 __pgprot(0)
  58
  59 #define __S000 __pgprot(0)
  60 #define __S001 __pgprot(0)
  61 #define __S010 __pgprot(0)
  62 #define __S011 __pgprot(0)
  63 #define __S100 __pgprot(0)
  64 #define __S101 __pgprot(0)
  65 #define __S110 __pgprot(0)
  66 #define __S111 __pgprot(0)
  67
  68 extern unsigned long _page_cachable_default;
  69
  70 /*
  71  * ZERO_PAGE is a global shared page that is always zero; used
  72  * for zero-mapped memory areas etc..
  73  */
  74
  75 extern unsigned long empty_zero_page;
  76 extern unsigned long zero_page_mask;
  77
  78 #define ZERO_PAGE(vaddr) \
  79         (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  80 #define __HAVE_COLOR_ZERO_PAGE
  81
  82 extern void paging_init(void);
  83
  84 /*
  85  * Conversion functions: convert a page and protection to a page entry,
  86  * and a page entry and page directory to the page they refer to.
  87  */
  88 #define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  89
  90 #define __pmd_page(pmd)         (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  91 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
  92 #define pmd_page(pmd)           __pmd_page(pmd)
  93 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
  94
  95 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
  96
  97 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
  98
  99 #define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
 100 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 101
 102 static inline void set_pte(pte_t *ptep, pte_t pte)
 103 {
 104         ptep->pte_high = pte.pte_high;
 105         smp_wmb();
 106         ptep->pte_low = pte.pte_low;
 107
 108         if (pte.pte_low & _PAGE_GLOBAL) {
 109                 pte_t *buddy = ptep_buddy(ptep);
 110                 /*
 111                  * Make sure the buddy is global too (if it's !none,
 112                  * it better already be global)
 113                  */
 114                 if (pte_none(*buddy)) {
 115                         buddy->pte_low  |= _PAGE_GLOBAL;
 116                         buddy->pte_high |= _PAGE_GLOBAL;
 117                 }
 118         }
 119 }
 120 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 121
 122 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 123 {
 124         pte_t null = __pte(0);
 125
 126         /* Preserve global status for the pair */
 127         if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 128                 null.pte_low = null.pte_high = _PAGE_GLOBAL;
 129
 130         set_pte_at(mm, addr, ptep, null);
 131 }
 132 #else
 133
 134 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 135 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 136
 137 /*
 138  * Certain architectures need to do special things when pte's
 139  * within a page table are directly modified.  Thus, the following
 140  * hook is made available.
 141  */
 142 static inline void set_pte(pte_t *ptep, pte_t pteval)
 143 {
 144         *ptep = pteval;
 145 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 146         if (pte_val(pteval) & _PAGE_GLOBAL) {
 147                 pte_t *buddy = ptep_buddy(ptep);
 148                 /*
 149                  * Make sure the buddy is global too (if it's !none,
 150                  * it better already be global)
 151                  */
 152                 if (pte_none(*buddy))
 153                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 154         }
 155 #endif
 156 }
 157 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 158
 159 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 160 {
 161 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 162         /* Preserve global status for the pair */
 163         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 164                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 165         else
 166 #endif
 167                 set_pte_at(mm, addr, ptep, __pte(0));
 168 }
 169 #endif
 170
 171 /*
 172  * (pmds are folded into puds so this doesn't get actually called,
 173  * but the define is needed for a generic inline function.)
 174  */
 175 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 176
 177 #ifndef __PAGETABLE_PMD_FOLDED
 178 /*
 179  * (puds are folded into pgds so this doesn't get actually called,
 180  * but the define is needed for a generic inline function.)
 181  */
 182 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 183 #endif
 184
 185 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 186 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 187 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 188
 189 /*
 190  * We used to declare this array with size but gcc 3.3 and older are not able
 191  * to find that this expression is a constant, so the size is dropped.
 192  */
 193 extern pgd_t swapper_pg_dir[];
 194
 195 /*
 196  * The following only work if pte_present() is true.
 197  * Undefined behaviour if not..
 198  */
 199 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 200 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 201 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 202 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 203 static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 204
 205 static inline pte_t pte_wrprotect(pte_t pte)
 206 {
 207         pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 208         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 209         return pte;
 210 }
 211
 212 static inline pte_t pte_mkclean(pte_t pte)
 213 {
 214         pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 215         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 216         return pte;
 217 }
 218
 219 static inline pte_t pte_mkold(pte_t pte)
 220 {
 221         pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 222         pte.pte_high &= ~_PAGE_SILENT_READ;
 223         return pte;
 224 }
 225
 226 static inline pte_t pte_mkwrite(pte_t pte)
 227 {
 228         pte.pte_low |= _PAGE_WRITE;
 229         if (pte.pte_low & _PAGE_MODIFIED) {
 230                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 231                 pte.pte_high |= _PAGE_SILENT_WRITE;
 232         }
 233         return pte;
 234 }
 235
 236 static inline pte_t pte_mkdirty(pte_t pte)
 237 {
 238         pte.pte_low |= _PAGE_MODIFIED;
 239         if (pte.pte_low & _PAGE_WRITE) {
 240                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 241                 pte.pte_high |= _PAGE_SILENT_WRITE;
 242         }
 243         return pte;
 244 }
 245
 246 static inline pte_t pte_mkyoung(pte_t pte)
 247 {
 248         pte.pte_low |= _PAGE_ACCESSED;
 249         if (pte.pte_low & _PAGE_READ) {
 250                 pte.pte_low  |= _PAGE_SILENT_READ;
 251                 pte.pte_high |= _PAGE_SILENT_READ;
 252         }
 253         return pte;
 254 }
 255 #else
 256 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 257 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 258 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 259 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 260
 261 static inline pte_t pte_wrprotect(pte_t pte)
 262 {
 263         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 264         return pte;
 265 }
 266
 267 static inline pte_t pte_mkclean(pte_t pte)
 268 {
 269         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 270         return pte;
 271 }
 272
 273 static inline pte_t pte_mkold(pte_t pte)
 274 {
 275         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 276         return pte;
 277 }
 278
 279 static inline pte_t pte_mkwrite(pte_t pte)
 280 {
 281         pte_val(pte) |= _PAGE_WRITE;
 282         if (pte_val(pte) & _PAGE_MODIFIED)
 283                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 284         return pte;
 285 }
 286
 287 static inline pte_t pte_mkdirty(pte_t pte)
 288 {
 289         pte_val(pte) |= _PAGE_MODIFIED;
 290         if (pte_val(pte) & _PAGE_WRITE)
 291                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 292         return pte;
 293 }
 294
 295 static inline pte_t pte_mkyoung(pte_t pte)
 296 {
 297         pte_val(pte) |= _PAGE_ACCESSED;
 298         if (cpu_has_rixi) {
 299                 if (!(pte_val(pte) & _PAGE_NO_READ))
 300                         pte_val(pte) |= _PAGE_SILENT_READ;
 301         } else {
 302                 if (pte_val(pte) & _PAGE_READ)
 303                         pte_val(pte) |= _PAGE_SILENT_READ;
 304         }
 305         return pte;
 306 }
 307
 308 #ifdef _PAGE_HUGE
 309 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 310
 311 static inline pte_t pte_mkhuge(pte_t pte)
 312 {
 313         pte_val(pte) |= _PAGE_HUGE;
 314         return pte;
 315 }
 316 #endif /* _PAGE_HUGE */
 317 #endif
 318 static inline int pte_special(pte_t pte)        { return 0; }
 319 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 320
 321 /*
 322  * Macro to make mark a page protection value as "uncacheable".  Note
 323  * that "protection" is really a misnomer here as the protection value
 324  * contains the memory attribute bits, dirty bits, and various other
 325  * bits as well.
 326  */
 327 #define pgprot_noncached pgprot_noncached
 328
 329 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 330 {
 331         unsigned long prot = pgprot_val(_prot);
 332
 333         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 334
 335         return __pgprot(prot);
 336 }
 337
 338 /*
 339  * Conversion functions: convert a page and protection to a page entry,
 340  * and a page entry and page directory to the page they refer to.
 341  */
 342 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 343
 344 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 345 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 346 {
 347         pte.pte_low  &= _PAGE_CHG_MASK;
 348         pte.pte_high &= ~0x3f;
 349         pte.pte_low  |= pgprot_val(newprot);
 350         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 351         return pte;
 352 }
 353 #else
 354 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 355 {
 356         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 357 }
 358 #endif
 359
 360
 361 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 362         pte_t pte);
 363 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 364         pte_t pte);
 365
 366 static inline void update_mmu_cache(struct vm_area_struct *vma,
 367         unsigned long address, pte_t *ptep)
 368 {
 369         pte_t pte = *ptep;
 370         __update_tlb(vma, address, pte);
 371         __update_cache(vma, address, pte);
 372 }
 373
 374 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 375         unsigned long address, pmd_t *pmdp)
 376 {
 377         pte_t pte = *(pte_t *)pmdp;
 378
 379         __update_tlb(vma, address, pte);
 380 }
 381
 382 #define kern_addr_valid(addr)   (1)
 383
 384 #ifdef CONFIG_64BIT_PHYS_ADDR
 385 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 386
 387 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 388                 unsigned long vaddr,
 389                 unsigned long pfn,
 390                 unsigned long size,
 391                 pgprot_t prot)
 392 {
 393         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 394         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 395 }
 396 #else
 397 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 398                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 399 #endif
 400
 401 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 402
 403 extern int has_transparent_hugepage(void);
 404
 405 static inline int pmd_trans_huge(pmd_t pmd)
 406 {
 407         return !!(pmd_val(pmd) & _PAGE_HUGE);
 408 }
 409
 410 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 411 {
 412         pmd_val(pmd) |= _PAGE_HUGE;
 413
 414         return pmd;
 415 }
 416
 417 static inline int pmd_trans_splitting(pmd_t pmd)
 418 {
 419         return !!(pmd_val(pmd) & _PAGE_SPLITTING);
 420 }
 421
 422 static inline pmd_t pmd_mksplitting(pmd_t pmd)
 423 {
 424         pmd_val(pmd) |= _PAGE_SPLITTING;
 425
 426         return pmd;
 427 }
 428
 429 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 430                        pmd_t *pmdp, pmd_t pmd);
 431
 432 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 433 /* Extern to avoid header file madness */
 434 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 435                                         unsigned long address,
 436                                         pmd_t *pmdp);
 437
 438 #define __HAVE_ARCH_PMD_WRITE
 439 static inline int pmd_write(pmd_t pmd)
 440 {
 441         return !!(pmd_val(pmd) & _PAGE_WRITE);
 442 }
 443
 444 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 445 {
 446         pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 447         return pmd;
 448 }
 449
 450 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 451 {
 452         pmd_val(pmd) |= _PAGE_WRITE;
 453         if (pmd_val(pmd) & _PAGE_MODIFIED)
 454                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 455
 456         return pmd;
 457 }
 458
 459 static inline int pmd_dirty(pmd_t pmd)
 460 {
 461         return !!(pmd_val(pmd) & _PAGE_MODIFIED);
 462 }
 463
 464 static inline pmd_t pmd_mkclean(pmd_t pmd)
 465 {
 466         pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 467         return pmd;
 468 }
 469
 470 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 471 {
 472         pmd_val(pmd) |= _PAGE_MODIFIED;
 473         if (pmd_val(pmd) & _PAGE_WRITE)
 474                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 475
 476         return pmd;
 477 }
 478
 479 static inline int pmd_young(pmd_t pmd)
 480 {
 481         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
 482 }
 483
 484 static inline pmd_t pmd_mkold(pmd_t pmd)
 485 {
 486         pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 487
 488         return pmd;
 489 }
 490
 491 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 492 {
 493         pmd_val(pmd) |= _PAGE_ACCESSED;
 494
 495         if (cpu_has_rixi) {
 496                 if (!(pmd_val(pmd) & _PAGE_NO_READ))
 497                         pmd_val(pmd) |= _PAGE_SILENT_READ;
 498         } else {
 499                 if (pmd_val(pmd) & _PAGE_READ)
 500                         pmd_val(pmd) |= _PAGE_SILENT_READ;
 501         }
 502
 503         return pmd;
 504 }
 505
 506 /* Extern to avoid header file madness */
 507 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
 508
 509 static inline unsigned long pmd_pfn(pmd_t pmd)
 510 {
 511         return pmd_val(pmd) >> _PFN_SHIFT;
 512 }
 513
 514 static inline struct page *pmd_page(pmd_t pmd)
 515 {
 516         if (pmd_trans_huge(pmd))
 517                 return pfn_to_page(pmd_pfn(pmd));
 518
 519         return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
 520 }
 521
 522 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 523 {
 524         pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
 525         return pmd;
 526 }
 527
 528 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 529 {
 530         pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
 531
 532         return pmd;
 533 }
 534
 535 /*
 536  * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
 537  * different prototype.
 538  */
 539 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
 540 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
 541                                        unsigned long address, pmd_t *pmdp)
 542 {
 543         pmd_t old = *pmdp;
 544
 545         pmd_clear(pmdp);
 546
 547         return old;
 548 }
 549
 550 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 551
 552 #include <asm-generic/pgtable.h>
 553
 554 /*
 555  * uncached accelerated TLB map for video memory access
 556  */
 557 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
 558 #define __HAVE_PHYS_MEM_ACCESS_PROT
 559
 560 struct file;
 561 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 562                 unsigned long size, pgprot_t vma_prot);
 563 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 564                 unsigned long size, pgprot_t *vma_prot);
 565 #endif
 566
 567 /*
 568  * We provide our own get_unmapped area to cope with the virtual aliasing
 569  * constraints placed on us by the cache architecture.
 570  */
 571 #define HAVE_ARCH_UNMAPPED_AREA
 572 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 573
 574 /*
 575  * No page table caches to initialise
 576  */
 577 #define pgtable_cache_init()    do { } while (0)
 578
 579 #endif /* _ASM_PGTABLE_H */