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 | _PAGE_READ | \
  28                                 _page_cachable_default)
  29#define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_NO_EXEC | \
  30                                 _page_cachable_default)
  31#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _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 | _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#define htw_stop()                                                      \
 101do {                                                                    \
 102        unsigned long flags;                                            \
 103                                                                        \
 104        if (cpu_has_htw) {                                              \
 105                local_irq_save(flags);                                  \
 106                if(!raw_current_cpu_data.htw_seq++) {                   \
 107                        write_c0_pwctl(read_c0_pwctl() &                \
 108                                       ~(1 << MIPS_PWCTL_PWEN_SHIFT));  \
 109                        back_to_back_c0_hazard();                       \
 110                }                                                       \
 111                local_irq_restore(flags);                               \
 112        }                                                               \
 113} while(0)
 114
 115#define htw_start()                                                     \
 116do {                                                                    \
 117        unsigned long flags;                                            \
 118                                                                        \
 119        if (cpu_has_htw) {                                              \
 120                local_irq_save(flags);                                  \
 121                if (!--raw_current_cpu_data.htw_seq) {                  \
 122                        write_c0_pwctl(read_c0_pwctl() |                \
 123                                       (1 << MIPS_PWCTL_PWEN_SHIFT));   \
 124                        back_to_back_c0_hazard();                       \
 125                }                                                       \
 126                local_irq_restore(flags);                               \
 127        }                                                               \
 128} while(0)
 129
 130#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 131
 132#define pte_none(pte)           (!(((pte).pte_high) & ~_PAGE_GLOBAL))
 133#define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 134
 135static inline void set_pte(pte_t *ptep, pte_t pte)
 136{
 137        ptep->pte_high = pte.pte_high;
 138        smp_wmb();
 139        ptep->pte_low = pte.pte_low;
 140
 141        if (pte.pte_high & _PAGE_GLOBAL) {
 142                pte_t *buddy = ptep_buddy(ptep);
 143                /*
 144                 * Make sure the buddy is global too (if it's !none,
 145                 * it better already be global)
 146                 */
 147                if (pte_none(*buddy))
 148                        buddy->pte_high |= _PAGE_GLOBAL;
 149        }
 150}
 151#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 152
 153static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 154{
 155        pte_t null = __pte(0);
 156
 157        htw_stop();
 158        /* Preserve global status for the pair */
 159        if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
 160                null.pte_high = _PAGE_GLOBAL;
 161
 162        set_pte_at(mm, addr, ptep, null);
 163        htw_start();
 164}
 165#else
 166
 167#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 168#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 169
 170/*
 171 * Certain architectures need to do special things when pte's
 172 * within a page table are directly modified.  Thus, the following
 173 * hook is made available.
 174 */
 175static inline void set_pte(pte_t *ptep, pte_t pteval)
 176{
 177        *ptep = pteval;
 178#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 179        if (pte_val(pteval) & _PAGE_GLOBAL) {
 180                pte_t *buddy = ptep_buddy(ptep);
 181                /*
 182                 * Make sure the buddy is global too (if it's !none,
 183                 * it better already be global)
 184                 */
 185#ifdef CONFIG_SMP
 186                /*
 187                 * For SMP, multiple CPUs can race, so we need to do
 188                 * this atomically.
 189                 */
 190#ifdef CONFIG_64BIT
 191#define LL_INSN "lld"
 192#define SC_INSN "scd"
 193#else /* CONFIG_32BIT */
 194#define LL_INSN "ll"
 195#define SC_INSN "sc"
 196#endif
 197                unsigned long page_global = _PAGE_GLOBAL;
 198                unsigned long tmp;
 199
 200                __asm__ __volatile__ (
 201                        "       .set    push\n"
 202                        "       .set    noreorder\n"
 203                        "1:     " LL_INSN "     %[tmp], %[buddy]\n"
 204                        "       bnez    %[tmp], 2f\n"
 205                        "        or     %[tmp], %[tmp], %[global]\n"
 206                        "       " SC_INSN "     %[tmp], %[buddy]\n"
 207                        "       beqz    %[tmp], 1b\n"
 208                        "        nop\n"
 209                        "2:\n"
 210                        "       .set pop"
 211                        : [buddy] "+m" (buddy->pte),
 212                          [tmp] "=&r" (tmp)
 213                        : [global] "r" (page_global));
 214#else /* !CONFIG_SMP */
 215                if (pte_none(*buddy))
 216                        pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 217#endif /* CONFIG_SMP */
 218        }
 219#endif
 220}
 221#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 222
 223static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 224{
 225        htw_stop();
 226#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 227        /* Preserve global status for the pair */
 228        if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 229                set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 230        else
 231#endif
 232                set_pte_at(mm, addr, ptep, __pte(0));
 233        htw_start();
 234}
 235#endif
 236
 237/*
 238 * (pmds are folded into puds so this doesn't get actually called,
 239 * but the define is needed for a generic inline function.)
 240 */
 241#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 242
 243#ifndef __PAGETABLE_PMD_FOLDED
 244/*
 245 * (puds are folded into pgds so this doesn't get actually called,
 246 * but the define is needed for a generic inline function.)
 247 */
 248#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 249#endif
 250
 251#define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 252#define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 253#define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 254
 255/*
 256 * We used to declare this array with size but gcc 3.3 and older are not able
 257 * to find that this expression is a constant, so the size is dropped.
 258 */
 259extern pgd_t swapper_pg_dir[];
 260
 261/*
 262 * The following only work if pte_present() is true.
 263 * Undefined behaviour if not..
 264 */
 265#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 266static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 267static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 268static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 269
 270static inline pte_t pte_wrprotect(pte_t pte)
 271{
 272        pte.pte_low  &= ~_PAGE_WRITE;
 273        pte.pte_high &= ~_PAGE_SILENT_WRITE;
 274        return pte;
 275}
 276
 277static inline pte_t pte_mkclean(pte_t pte)
 278{
 279        pte.pte_low  &= ~_PAGE_MODIFIED;
 280        pte.pte_high &= ~_PAGE_SILENT_WRITE;
 281        return pte;
 282}
 283
 284static inline pte_t pte_mkold(pte_t pte)
 285{
 286        pte.pte_low  &= ~_PAGE_ACCESSED;
 287        pte.pte_high &= ~_PAGE_SILENT_READ;
 288        return pte;
 289}
 290
 291static inline pte_t pte_mkwrite(pte_t pte)
 292{
 293        pte.pte_low |= _PAGE_WRITE;
 294        if (pte.pte_low & _PAGE_MODIFIED)
 295                pte.pte_high |= _PAGE_SILENT_WRITE;
 296        return pte;
 297}
 298
 299static inline pte_t pte_mkdirty(pte_t pte)
 300{
 301        pte.pte_low |= _PAGE_MODIFIED;
 302        if (pte.pte_low & _PAGE_WRITE)
 303                pte.pte_high |= _PAGE_SILENT_WRITE;
 304        return pte;
 305}
 306
 307static inline pte_t pte_mkyoung(pte_t pte)
 308{
 309        pte.pte_low |= _PAGE_ACCESSED;
 310        if (pte.pte_low & _PAGE_READ)
 311                pte.pte_high |= _PAGE_SILENT_READ;
 312        return pte;
 313}
 314#else
 315static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 316static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 317static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 318
 319static inline pte_t pte_wrprotect(pte_t pte)
 320{
 321        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 322        return pte;
 323}
 324
 325static inline pte_t pte_mkclean(pte_t pte)
 326{
 327        pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 328        return pte;
 329}
 330
 331static inline pte_t pte_mkold(pte_t pte)
 332{
 333        pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 334        return pte;
 335}
 336
 337static inline pte_t pte_mkwrite(pte_t pte)
 338{
 339        pte_val(pte) |= _PAGE_WRITE;
 340        if (pte_val(pte) & _PAGE_MODIFIED)
 341                pte_val(pte) |= _PAGE_SILENT_WRITE;
 342        return pte;
 343}
 344
 345static inline pte_t pte_mkdirty(pte_t pte)
 346{
 347        pte_val(pte) |= _PAGE_MODIFIED;
 348        if (pte_val(pte) & _PAGE_WRITE)
 349                pte_val(pte) |= _PAGE_SILENT_WRITE;
 350        return pte;
 351}
 352
 353static inline pte_t pte_mkyoung(pte_t pte)
 354{
 355        pte_val(pte) |= _PAGE_ACCESSED;
 356#ifdef CONFIG_CPU_MIPSR2
 357        if (!(pte_val(pte) & _PAGE_NO_READ))
 358                pte_val(pte) |= _PAGE_SILENT_READ;
 359        else
 360#endif
 361        if (pte_val(pte) & _PAGE_READ)
 362                pte_val(pte) |= _PAGE_SILENT_READ;
 363        return pte;
 364}
 365
 366#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
 367static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 368
 369static inline pte_t pte_mkhuge(pte_t pte)
 370{
 371        pte_val(pte) |= _PAGE_HUGE;
 372        return pte;
 373}
 374#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
 375#endif
 376static inline int pte_special(pte_t pte)        { return 0; }
 377static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 378
 379/*
 380 * Macro to make mark a page protection value as "uncacheable".  Note
 381 * that "protection" is really a misnomer here as the protection value
 382 * contains the memory attribute bits, dirty bits, and various other
 383 * bits as well.
 384 */
 385#define pgprot_noncached pgprot_noncached
 386
 387static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 388{
 389        unsigned long prot = pgprot_val(_prot);
 390
 391        prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 392
 393        return __pgprot(prot);
 394}
 395
 396static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 397{
 398        unsigned long prot = pgprot_val(_prot);
 399
 400        /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
 401        prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
 402
 403        return __pgprot(prot);
 404}
 405
 406/*
 407 * Conversion functions: convert a page and protection to a page entry,
 408 * and a page entry and page directory to the page they refer to.
 409 */
 410#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 411
 412#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 413static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 414{
 415        pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
 416        pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
 417        pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
 418        pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK;
 419        return pte;
 420}
 421#else
 422static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 423{
 424        return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 425}
 426#endif
 427
 428
 429extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 430        pte_t pte);
 431extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 432        pte_t pte);
 433
 434static inline void update_mmu_cache(struct vm_area_struct *vma,
 435        unsigned long address, pte_t *ptep)
 436{
 437        pte_t pte = *ptep;
 438        __update_tlb(vma, address, pte);
 439        __update_cache(vma, address, pte);
 440}
 441
 442static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 443        unsigned long address, pmd_t *pmdp)
 444{
 445        pte_t pte = *(pte_t *)pmdp;
 446
 447        __update_tlb(vma, address, pte);
 448}
 449
 450#define kern_addr_valid(addr)   (1)
 451
 452#ifdef CONFIG_PHYS_ADDR_T_64BIT
 453extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 454
 455static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 456                unsigned long vaddr,
 457                unsigned long pfn,
 458                unsigned long size,
 459                pgprot_t prot)
 460{
 461        phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 462        return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 463}
 464#define io_remap_pfn_range io_remap_pfn_range
 465#endif
 466
 467#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 468
 469extern int has_transparent_hugepage(void);
 470
 471static inline int pmd_trans_huge(pmd_t pmd)
 472{
 473        return !!(pmd_val(pmd) & _PAGE_HUGE);
 474}
 475
 476static inline pmd_t pmd_mkhuge(pmd_t pmd)
 477{
 478        pmd_val(pmd) |= _PAGE_HUGE;
 479
 480        return pmd;
 481}
 482
 483static inline int pmd_trans_splitting(pmd_t pmd)
 484{
 485        return !!(pmd_val(pmd) & _PAGE_SPLITTING);
 486}
 487
 488static inline pmd_t pmd_mksplitting(pmd_t pmd)
 489{
 490        pmd_val(pmd) |= _PAGE_SPLITTING;
 491
 492        return pmd;
 493}
 494
 495extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 496                       pmd_t *pmdp, pmd_t pmd);
 497
 498#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 499/* Extern to avoid header file madness */
 500extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 501                                        unsigned long address,
 502                                        pmd_t *pmdp);
 503
 504#define __HAVE_ARCH_PMD_WRITE
 505static inline int pmd_write(pmd_t pmd)
 506{
 507        return !!(pmd_val(pmd) & _PAGE_WRITE);
 508}
 509
 510static inline pmd_t pmd_wrprotect(pmd_t pmd)
 511{
 512        pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 513        return pmd;
 514}
 515
 516static inline pmd_t pmd_mkwrite(pmd_t pmd)
 517{
 518        pmd_val(pmd) |= _PAGE_WRITE;
 519        if (pmd_val(pmd) & _PAGE_MODIFIED)
 520                pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 521
 522        return pmd;
 523}
 524
 525static inline int pmd_dirty(pmd_t pmd)
 526{
 527        return !!(pmd_val(pmd) & _PAGE_MODIFIED);
 528}
 529
 530static inline pmd_t pmd_mkclean(pmd_t pmd)
 531{
 532        pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 533        return pmd;
 534}
 535
 536static inline pmd_t pmd_mkdirty(pmd_t pmd)
 537{
 538        pmd_val(pmd) |= _PAGE_MODIFIED;
 539        if (pmd_val(pmd) & _PAGE_WRITE)
 540                pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 541
 542        return pmd;
 543}
 544
 545static inline int pmd_young(pmd_t pmd)
 546{
 547        return !!(pmd_val(pmd) & _PAGE_ACCESSED);
 548}
 549
 550static inline pmd_t pmd_mkold(pmd_t pmd)
 551{
 552        pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 553
 554        return pmd;
 555}
 556
 557static inline pmd_t pmd_mkyoung(pmd_t pmd)
 558{
 559        pmd_val(pmd) |= _PAGE_ACCESSED;
 560
 561#ifdef CONFIG_CPU_MIPSR2
 562        if (!(pmd_val(pmd) & _PAGE_NO_READ))
 563                pmd_val(pmd) |= _PAGE_SILENT_READ;
 564        else
 565#endif
 566        if (pmd_val(pmd) & _PAGE_READ)
 567                pmd_val(pmd) |= _PAGE_SILENT_READ;
 568
 569        return pmd;
 570}
 571
 572/* Extern to avoid header file madness */
 573extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
 574
 575static inline unsigned long pmd_pfn(pmd_t pmd)
 576{
 577        return pmd_val(pmd) >> _PFN_SHIFT;
 578}
 579
 580static inline struct page *pmd_page(pmd_t pmd)
 581{
 582        if (pmd_trans_huge(pmd))
 583                return pfn_to_page(pmd_pfn(pmd));
 584
 585        return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
 586}
 587
 588static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 589{
 590        pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
 591        return pmd;
 592}
 593
 594static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 595{
 596        pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
 597
 598        return pmd;
 599}
 600
 601/*
 602 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
 603 * different prototype.
 604 */
 605#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
 606static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
 607                                            unsigned long address, pmd_t *pmdp)
 608{
 609        pmd_t old = *pmdp;
 610
 611        pmd_clear(pmdp);
 612
 613        return old;
 614}
 615
 616#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 617
 618#include <asm-generic/pgtable.h>
 619
 620/*
 621 * uncached accelerated TLB map for video memory access
 622 */
 623#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
 624#define __HAVE_PHYS_MEM_ACCESS_PROT
 625
 626struct file;
 627pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 628                unsigned long size, pgprot_t vma_prot);
 629int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 630                unsigned long size, pgprot_t *vma_prot);
 631#endif
 632
 633/*
 634 * We provide our own get_unmapped area to cope with the virtual aliasing
 635 * constraints placed on us by the cache architecture.
 636 */
 637#define HAVE_ARCH_UNMAPPED_AREA
 638#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 639
 640/*
 641 * No page table caches to initialise
 642 */
 643#define pgtable_cache_init()    do { } while (0)
 644
 645#endif /* _ASM_PGTABLE_H */
 646