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 130static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 131 pte_t *ptep, pte_t pteval); 132 133#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 134 135#define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL)) 136#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 137#define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC) 138 139static inline void set_pte(pte_t *ptep, pte_t pte) 140{ 141 ptep->pte_high = pte.pte_high; 142 smp_wmb(); 143 ptep->pte_low = pte.pte_low; 144 145 if (pte.pte_high & _PAGE_GLOBAL) { 146 pte_t *buddy = ptep_buddy(ptep); 147 /* 148 * Make sure the buddy is global too (if it's !none, 149 * it better already be global) 150 */ 151 if (pte_none(*buddy)) 152 buddy->pte_high |= _PAGE_GLOBAL; 153 } 154} 155 156static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 157{ 158 pte_t null = __pte(0); 159 160 htw_stop(); 161 /* Preserve global status for the pair */ 162 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL) 163 null.pte_high = _PAGE_GLOBAL; 164 165 set_pte_at(mm, addr, ptep, null); 166 htw_start(); 167} 168#else 169 170#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 171#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 172#define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) 173 174/* 175 * Certain architectures need to do special things when pte's 176 * within a page table are directly modified. Thus, the following 177 * hook is made available. 178 */ 179static inline void set_pte(pte_t *ptep, pte_t pteval) 180{ 181 *ptep = pteval; 182#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 183 if (pte_val(pteval) & _PAGE_GLOBAL) { 184 pte_t *buddy = ptep_buddy(ptep); 185 /* 186 * Make sure the buddy is global too (if it's !none, 187 * it better already be global) 188 */ 189#ifdef CONFIG_SMP 190 /* 191 * For SMP, multiple CPUs can race, so we need to do 192 * this atomically. 193 */ 194#ifdef CONFIG_64BIT 195#define LL_INSN "lld" 196#define SC_INSN "scd" 197#else /* CONFIG_32BIT */ 198#define LL_INSN "ll" 199#define SC_INSN "sc" 200#endif 201 unsigned long page_global = _PAGE_GLOBAL; 202 unsigned long tmp; 203 204 __asm__ __volatile__ ( 205 " .set push\n" 206 " .set noreorder\n" 207 "1: " LL_INSN " %[tmp], %[buddy]\n" 208 " bnez %[tmp], 2f\n" 209 " or %[tmp], %[tmp], %[global]\n" 210 " " SC_INSN " %[tmp], %[buddy]\n" 211 " beqz %[tmp], 1b\n" 212 " nop\n" 213 "2:\n" 214 " .set pop" 215 : [buddy] "+m" (buddy->pte), 216 [tmp] "=&r" (tmp) 217 : [global] "r" (page_global)); 218#else /* !CONFIG_SMP */ 219 if (pte_none(*buddy)) 220 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 221#endif /* CONFIG_SMP */ 222 } 223#endif 224} 225 226static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 227{ 228 htw_stop(); 229#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 230 /* Preserve global status for the pair */ 231 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 232 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 233 else 234#endif 235 set_pte_at(mm, addr, ptep, __pte(0)); 236 htw_start(); 237} 238#endif 239 240static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 241 pte_t *ptep, pte_t pteval) 242{ 243 extern void __update_cache(unsigned long address, pte_t pte); 244 245 if (!pte_present(pteval)) 246 goto cache_sync_done; 247 248 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval))) 249 goto cache_sync_done; 250 251 __update_cache(addr, pteval); 252cache_sync_done: 253 set_pte(ptep, pteval); 254} 255 256/* 257 * (pmds are folded into puds so this doesn't get actually called, 258 * but the define is needed for a generic inline function.) 259 */ 260#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 261 262#ifndef __PAGETABLE_PMD_FOLDED 263/* 264 * (puds are folded into pgds so this doesn't get actually called, 265 * but the define is needed for a generic inline function.) 266 */ 267#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 268#endif 269 270#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 271#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 272#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 273 274/* 275 * We used to declare this array with size but gcc 3.3 and older are not able 276 * to find that this expression is a constant, so the size is dropped. 277 */ 278extern pgd_t swapper_pg_dir[]; 279 280/* 281 * The following only work if pte_present() is true. 282 * Undefined behaviour if not.. 283 */ 284#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 285static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 286static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 287static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 288 289static inline pte_t pte_wrprotect(pte_t pte) 290{ 291 pte.pte_low &= ~_PAGE_WRITE; 292 pte.pte_high &= ~_PAGE_SILENT_WRITE; 293 return pte; 294} 295 296static inline pte_t pte_mkclean(pte_t pte) 297{ 298 pte.pte_low &= ~_PAGE_MODIFIED; 299 pte.pte_high &= ~_PAGE_SILENT_WRITE; 300 return pte; 301} 302 303static inline pte_t pte_mkold(pte_t pte) 304{ 305 pte.pte_low &= ~_PAGE_ACCESSED; 306 pte.pte_high &= ~_PAGE_SILENT_READ; 307 return pte; 308} 309 310static inline pte_t pte_mkwrite(pte_t pte) 311{ 312 pte.pte_low |= _PAGE_WRITE; 313 if (pte.pte_low & _PAGE_MODIFIED) 314 pte.pte_high |= _PAGE_SILENT_WRITE; 315 return pte; 316} 317 318static inline pte_t pte_mkdirty(pte_t pte) 319{ 320 pte.pte_low |= _PAGE_MODIFIED; 321 if (pte.pte_low & _PAGE_WRITE) 322 pte.pte_high |= _PAGE_SILENT_WRITE; 323 return pte; 324} 325 326static inline pte_t pte_mkyoung(pte_t pte) 327{ 328 pte.pte_low |= _PAGE_ACCESSED; 329 if (pte.pte_low & _PAGE_READ) 330 pte.pte_high |= _PAGE_SILENT_READ; 331 return pte; 332} 333#else 334static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 335static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 336static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 337 338static inline pte_t pte_wrprotect(pte_t pte) 339{ 340 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 341 return pte; 342} 343 344static inline pte_t pte_mkclean(pte_t pte) 345{ 346 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 347 return pte; 348} 349 350static inline pte_t pte_mkold(pte_t pte) 351{ 352 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 353 return pte; 354} 355 356static inline pte_t pte_mkwrite(pte_t pte) 357{ 358 pte_val(pte) |= _PAGE_WRITE; 359 if (pte_val(pte) & _PAGE_MODIFIED) 360 pte_val(pte) |= _PAGE_SILENT_WRITE; 361 return pte; 362} 363 364static inline pte_t pte_mkdirty(pte_t pte) 365{ 366 pte_val(pte) |= _PAGE_MODIFIED; 367 if (pte_val(pte) & _PAGE_WRITE) 368 pte_val(pte) |= _PAGE_SILENT_WRITE; 369 return pte; 370} 371 372static inline pte_t pte_mkyoung(pte_t pte) 373{ 374 pte_val(pte) |= _PAGE_ACCESSED; 375#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) 376 if (!(pte_val(pte) & _PAGE_NO_READ)) 377 pte_val(pte) |= _PAGE_SILENT_READ; 378 else 379#endif 380 if (pte_val(pte) & _PAGE_READ) 381 pte_val(pte) |= _PAGE_SILENT_READ; 382 return pte; 383} 384 385#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT 386static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 387 388static inline pte_t pte_mkhuge(pte_t pte) 389{ 390 pte_val(pte) |= _PAGE_HUGE; 391 return pte; 392} 393#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ 394#endif 395static inline int pte_special(pte_t pte) { return 0; } 396static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 397 398/* 399 * Macro to make mark a page protection value as "uncacheable". Note 400 * that "protection" is really a misnomer here as the protection value 401 * contains the memory attribute bits, dirty bits, and various other 402 * bits as well. 403 */ 404#define pgprot_noncached pgprot_noncached 405 406static inline pgprot_t pgprot_noncached(pgprot_t _prot) 407{ 408 unsigned long prot = pgprot_val(_prot); 409 410 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 411 412 return __pgprot(prot); 413} 414 415static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 416{ 417 unsigned long prot = pgprot_val(_prot); 418 419 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */ 420 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine; 421 422 return __pgprot(prot); 423} 424 425/* 426 * Conversion functions: convert a page and protection to a page entry, 427 * and a page entry and page directory to the page they refer to. 428 */ 429#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 430 431#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 432static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 433{ 434 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK); 435 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 436 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK; 437 pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK; 438 return pte; 439} 440#else 441static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 442{ 443 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 444} 445#endif 446 447 448extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 449 pte_t pte); 450 451static inline void update_mmu_cache(struct vm_area_struct *vma, 452 unsigned long address, pte_t *ptep) 453{ 454 pte_t pte = *ptep; 455 __update_tlb(vma, address, pte); 456} 457 458static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 459 unsigned long address, pmd_t *pmdp) 460{ 461 pte_t pte = *(pte_t *)pmdp; 462 463 __update_tlb(vma, address, pte); 464} 465 466#define kern_addr_valid(addr) (1) 467 468#ifdef CONFIG_PHYS_ADDR_T_64BIT 469extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 470 471static inline int io_remap_pfn_range(struct vm_area_struct *vma, 472 unsigned long vaddr, 473 unsigned long pfn, 474 unsigned long size, 475 pgprot_t prot) 476{ 477 phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 478 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 479} 480#define io_remap_pfn_range io_remap_pfn_range 481#endif 482 483#ifdef CONFIG_TRANSPARENT_HUGEPAGE 484 485extern int has_transparent_hugepage(void); 486 487static inline int pmd_trans_huge(pmd_t pmd) 488{ 489 return !!(pmd_val(pmd) & _PAGE_HUGE); 490} 491 492static inline pmd_t pmd_mkhuge(pmd_t pmd) 493{ 494 pmd_val(pmd) |= _PAGE_HUGE; 495 496 return pmd; 497} 498 499static inline int pmd_trans_splitting(pmd_t pmd) 500{ 501 return !!(pmd_val(pmd) & _PAGE_SPLITTING); 502} 503 504static inline pmd_t pmd_mksplitting(pmd_t pmd) 505{ 506 pmd_val(pmd) |= _PAGE_SPLITTING; 507 508 return pmd; 509} 510 511extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 512 pmd_t *pmdp, pmd_t pmd); 513 514#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH 515/* Extern to avoid header file madness */ 516extern void pmdp_splitting_flush(struct vm_area_struct *vma, 517 unsigned long address, 518 pmd_t *pmdp); 519 520#define __HAVE_ARCH_PMD_WRITE 521static inline int pmd_write(pmd_t pmd) 522{ 523 return !!(pmd_val(pmd) & _PAGE_WRITE); 524} 525 526static inline pmd_t pmd_wrprotect(pmd_t pmd) 527{ 528 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 529 return pmd; 530} 531 532static inline pmd_t pmd_mkwrite(pmd_t pmd) 533{ 534 pmd_val(pmd) |= _PAGE_WRITE; 535 if (pmd_val(pmd) & _PAGE_MODIFIED) 536 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 537 538 return pmd; 539} 540 541static inline int pmd_dirty(pmd_t pmd) 542{ 543 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 544} 545 546static inline pmd_t pmd_mkclean(pmd_t pmd) 547{ 548 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 549 return pmd; 550} 551 552static inline pmd_t pmd_mkdirty(pmd_t pmd) 553{ 554 pmd_val(pmd) |= _PAGE_MODIFIED; 555 if (pmd_val(pmd) & _PAGE_WRITE) 556 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 557 558 return pmd; 559} 560 561static inline int pmd_young(pmd_t pmd) 562{ 563 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 564} 565 566static inline pmd_t pmd_mkold(pmd_t pmd) 567{ 568 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 569 570 return pmd; 571} 572 573static inline pmd_t pmd_mkyoung(pmd_t pmd) 574{ 575 pmd_val(pmd) |= _PAGE_ACCESSED; 576 577#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) 578 if (!(pmd_val(pmd) & _PAGE_NO_READ)) 579 pmd_val(pmd) |= _PAGE_SILENT_READ; 580 else 581#endif 582 if (pmd_val(pmd) & _PAGE_READ) 583 pmd_val(pmd) |= _PAGE_SILENT_READ; 584 585 return pmd; 586} 587 588/* Extern to avoid header file madness */ 589extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 590 591static inline unsigned long pmd_pfn(pmd_t pmd) 592{ 593 return pmd_val(pmd) >> _PFN_SHIFT; 594} 595 596static inline struct page *pmd_page(pmd_t pmd) 597{ 598 if (pmd_trans_huge(pmd)) 599 return pfn_to_page(pmd_pfn(pmd)); 600 601 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 602} 603 604static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 605{ 606 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot); 607 return pmd; 608} 609 610static inline pmd_t pmd_mknotpresent(pmd_t pmd) 611{ 612 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); 613 614 return pmd; 615} 616 617/* 618 * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a 619 * different prototype. 620 */ 621#define __HAVE_ARCH_PMDP_GET_AND_CLEAR 622static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, 623 unsigned long address, pmd_t *pmdp) 624{ 625 pmd_t old = *pmdp; 626 627 pmd_clear(pmdp); 628 629 return old; 630} 631 632#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 633 634#include <asm-generic/pgtable.h> 635 636/* 637 * uncached accelerated TLB map for video memory access 638 */ 639#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED 640#define __HAVE_PHYS_MEM_ACCESS_PROT 641 642struct file; 643pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 644 unsigned long size, pgprot_t vma_prot); 645int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, 646 unsigned long size, pgprot_t *vma_prot); 647#endif 648 649/* 650 * We provide our own get_unmapped area to cope with the virtual aliasing 651 * constraints placed on us by the cache architecture. 652 */ 653#define HAVE_ARCH_UNMAPPED_AREA 654#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 655 656/* 657 * No page table caches to initialise 658 */ 659#define pgtable_cache_init() do { } while (0) 660 661#endif /* _ASM_PGTABLE_H */ 662