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