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/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
  22struct mm_struct;
  23struct 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
  68extern 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
  75extern unsigned long empty_zero_page;
  76extern 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
  82extern 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
 102static 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
 122static 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 */
 142static 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
 159static 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 */
 193extern 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)
 200static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 201static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 202static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 203static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 204
 205static 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
 212static 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
 219static 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
 226static 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
 236static 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
 246static 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
 256static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 257static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 258static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 259static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 260
 261static inline pte_t pte_wrprotect(pte_t pte)
 262{
 263        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 264        return pte;
 265}
 266
 267static inline pte_t pte_mkclean(pte_t pte)
 268{
 269        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 270        return pte;
 271}
 272
 273static inline pte_t pte_mkold(pte_t pte)
 274{
 275        pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 276        return pte;
 277}
 278
 279static 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
 287static 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
 295static 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
 309static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 310
 311static 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
 318static inline int pte_special(pte_t pte)        { return 0; }
 319static 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
 329static 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)
 345static 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
 354static 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
 361extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 362        pte_t pte);
 363extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 364        pte_t pte);
 365
 366static 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
 374static 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
 385extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 386
 387static 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
 403extern int has_transparent_hugepage(void);
 404
 405static inline int pmd_trans_huge(pmd_t pmd)
 406{
 407        return !!(pmd_val(pmd) & _PAGE_HUGE);
 408}
 409
 410static inline pmd_t pmd_mkhuge(pmd_t pmd)
 411{
 412        pmd_val(pmd) |= _PAGE_HUGE;
 413
 414        return pmd;
 415}
 416
 417static inline int pmd_trans_splitting(pmd_t pmd)
 418{
 419        return !!(pmd_val(pmd) & _PAGE_SPLITTING);
 420}
 421
 422static inline pmd_t pmd_mksplitting(pmd_t pmd)
 423{
 424        pmd_val(pmd) |= _PAGE_SPLITTING;
 425
 426        return pmd;
 427}
 428
 429extern 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 */
 434extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 435                                        unsigned long address,
 436                                        pmd_t *pmdp);
 437
 438#define __HAVE_ARCH_PMD_WRITE
 439static inline int pmd_write(pmd_t pmd)
 440{
 441        return !!(pmd_val(pmd) & _PAGE_WRITE);
 442}
 443
 444static inline pmd_t pmd_wrprotect(pmd_t pmd)
 445{
 446        pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 447        return pmd;
 448}
 449
 450static 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
 459static inline int pmd_dirty(pmd_t pmd)
 460{
 461        return !!(pmd_val(pmd) & _PAGE_MODIFIED);
 462}
 463
 464static inline pmd_t pmd_mkclean(pmd_t pmd)
 465{
 466        pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 467        return pmd;
 468}
 469
 470static 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
 479static inline int pmd_young(pmd_t pmd)
 480{
 481        return !!(pmd_val(pmd) & _PAGE_ACCESSED);
 482}
 483
 484static inline pmd_t pmd_mkold(pmd_t pmd)
 485{
 486        pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 487
 488        return pmd;
 489}
 490
 491static 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 */
 507extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
 508
 509static inline unsigned long pmd_pfn(pmd_t pmd)
 510{
 511        return pmd_val(pmd) >> _PFN_SHIFT;
 512}
 513
 514static 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
 522static 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
 528static 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
 540static 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
 560struct file;
 561pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 562                unsigned long size, pgprot_t vma_prot);
 563int 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 */
 580