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 23 struct mm_struct; 24 struct 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 71 extern 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 78 extern unsigned long empty_zero_page; 79 extern 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 85 extern 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() \ 101 do { \ 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() \ 116 do { \ 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) 134 135 static 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) 152 153 static 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 */ 175 static 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 if (pte_none(*buddy)) 186 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 187 } 188 #endif 189 } 190 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 191 192 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 193 { 194 htw_stop(); 195 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 196 /* Preserve global status for the pair */ 197 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 198 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 199 else 200 #endif 201 set_pte_at(mm, addr, ptep, __pte(0)); 202 htw_start(); 203 } 204 #endif 205 206 /* 207 * (pmds are folded into puds so this doesn't get actually called, 208 * but the define is needed for a generic inline function.) 209 */ 210 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 211 212 #ifndef __PAGETABLE_PMD_FOLDED 213 /* 214 * (puds are folded into pgds so this doesn't get actually called, 215 * but the define is needed for a generic inline function.) 216 */ 217 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 218 #endif 219 220 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 221 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 222 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 223 224 /* 225 * We used to declare this array with size but gcc 3.3 and older are not able 226 * to find that this expression is a constant, so the size is dropped. 227 */ 228 extern pgd_t swapper_pg_dir[]; 229 230 /* 231 * The following only work if pte_present() is true. 232 * Undefined behaviour if not.. 233 */ 234 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 235 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 236 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 237 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 238 239 static inline pte_t pte_wrprotect(pte_t pte) 240 { 241 pte.pte_low &= ~_PAGE_WRITE; 242 pte.pte_high &= ~_PAGE_SILENT_WRITE; 243 return pte; 244 } 245 246 static inline pte_t pte_mkclean(pte_t pte) 247 { 248 pte.pte_low &= ~_PAGE_MODIFIED; 249 pte.pte_high &= ~_PAGE_SILENT_WRITE; 250 return pte; 251 } 252 253 static inline pte_t pte_mkold(pte_t pte) 254 { 255 pte.pte_low &= ~_PAGE_ACCESSED; 256 pte.pte_high &= ~_PAGE_SILENT_READ; 257 return pte; 258 } 259 260 static inline pte_t pte_mkwrite(pte_t pte) 261 { 262 pte.pte_low |= _PAGE_WRITE; 263 if (pte.pte_low & _PAGE_MODIFIED) 264 pte.pte_high |= _PAGE_SILENT_WRITE; 265 return pte; 266 } 267 268 static inline pte_t pte_mkdirty(pte_t pte) 269 { 270 pte.pte_low |= _PAGE_MODIFIED; 271 if (pte.pte_low & _PAGE_WRITE) 272 pte.pte_high |= _PAGE_SILENT_WRITE; 273 return pte; 274 } 275 276 static inline pte_t pte_mkyoung(pte_t pte) 277 { 278 pte.pte_low |= _PAGE_ACCESSED; 279 if (pte.pte_low & _PAGE_READ) 280 pte.pte_high |= _PAGE_SILENT_READ; 281 return pte; 282 } 283 #else 284 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 285 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 286 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 287 288 static inline pte_t pte_wrprotect(pte_t pte) 289 { 290 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 291 return pte; 292 } 293 294 static inline pte_t pte_mkclean(pte_t pte) 295 { 296 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 297 return pte; 298 } 299 300 static inline pte_t pte_mkold(pte_t pte) 301 { 302 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 303 return pte; 304 } 305 306 static inline pte_t pte_mkwrite(pte_t pte) 307 { 308 pte_val(pte) |= _PAGE_WRITE; 309 if (pte_val(pte) & _PAGE_MODIFIED) 310 pte_val(pte) |= _PAGE_SILENT_WRITE; 311 return pte; 312 } 313 314 static inline pte_t pte_mkdirty(pte_t pte) 315 { 316 pte_val(pte) |= _PAGE_MODIFIED; 317 if (pte_val(pte) & _PAGE_WRITE) 318 pte_val(pte) |= _PAGE_SILENT_WRITE; 319 return pte; 320 } 321 322 static inline pte_t pte_mkyoung(pte_t pte) 323 { 324 pte_val(pte) |= _PAGE_ACCESSED; 325 #ifdef CONFIG_CPU_MIPSR2 326 if (!(pte_val(pte) & _PAGE_NO_READ)) 327 pte_val(pte) |= _PAGE_SILENT_READ; 328 else 329 #endif 330 if (pte_val(pte) & _PAGE_READ) 331 pte_val(pte) |= _PAGE_SILENT_READ; 332 return pte; 333 } 334 335 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT 336 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 337 338 static inline pte_t pte_mkhuge(pte_t pte) 339 { 340 pte_val(pte) |= _PAGE_HUGE; 341 return pte; 342 } 343 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ 344 #endif 345 static inline int pte_special(pte_t pte) { return 0; } 346 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 347 348 /* 349 * Macro to make mark a page protection value as "uncacheable". Note 350 * that "protection" is really a misnomer here as the protection value 351 * contains the memory attribute bits, dirty bits, and various other 352 * bits as well. 353 */ 354 #define pgprot_noncached pgprot_noncached 355 356 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 357 { 358 unsigned long prot = pgprot_val(_prot); 359 360 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 361 362 return __pgprot(prot); 363 } 364 365 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 366 { 367 unsigned long prot = pgprot_val(_prot); 368 369 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */ 370 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine; 371 372 return __pgprot(prot); 373 } 374 375 /* 376 * Conversion functions: convert a page and protection to a page entry, 377 * and a page entry and page directory to the page they refer to. 378 */ 379 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 380 381 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) 382 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 383 { 384 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK); 385 pte.pte_high &= (_PFN_MASK | _CACHE_MASK); 386 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK; 387 pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK; 388 return pte; 389 } 390 #else 391 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 392 { 393 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 394 } 395 #endif 396 397 398 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 399 pte_t pte); 400 extern void __update_cache(struct vm_area_struct *vma, unsigned long address, 401 pte_t pte); 402 403 static inline void update_mmu_cache(struct vm_area_struct *vma, 404 unsigned long address, pte_t *ptep) 405 { 406 pte_t pte = *ptep; 407 __update_tlb(vma, address, pte); 408 __update_cache(vma, address, pte); 409 } 410 411 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 412 unsigned long address, pmd_t *pmdp) 413 { 414 pte_t pte = *(pte_t *)pmdp; 415 416 __update_tlb(vma, address, pte); 417 } 418 419 #define kern_addr_valid(addr) (1) 420 421 #ifdef CONFIG_PHYS_ADDR_T_64BIT 422 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 423 424 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 425 unsigned long vaddr, 426 unsigned long pfn, 427 unsigned long size, 428 pgprot_t prot) 429 { 430 phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 431 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 432 } 433 #define io_remap_pfn_range io_remap_pfn_range 434 #endif 435 436 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 437 438 extern int has_transparent_hugepage(void); 439 440 static inline int pmd_trans_huge(pmd_t pmd) 441 { 442 return !!(pmd_val(pmd) & _PAGE_HUGE); 443 } 444 445 static inline pmd_t pmd_mkhuge(pmd_t pmd) 446 { 447 pmd_val(pmd) |= _PAGE_HUGE; 448 449 return pmd; 450 } 451 452 static inline int pmd_trans_splitting(pmd_t pmd) 453 { 454 return !!(pmd_val(pmd) & _PAGE_SPLITTING); 455 } 456 457 static inline pmd_t pmd_mksplitting(pmd_t pmd) 458 { 459 pmd_val(pmd) |= _PAGE_SPLITTING; 460 461 return pmd; 462 } 463 464 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 465 pmd_t *pmdp, pmd_t pmd); 466 467 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH 468 /* Extern to avoid header file madness */ 469 extern void pmdp_splitting_flush(struct vm_area_struct *vma, 470 unsigned long address, 471 pmd_t *pmdp); 472 473 #define __HAVE_ARCH_PMD_WRITE 474 static inline int pmd_write(pmd_t pmd) 475 { 476 return !!(pmd_val(pmd) & _PAGE_WRITE); 477 } 478 479 static inline pmd_t pmd_wrprotect(pmd_t pmd) 480 { 481 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 482 return pmd; 483 } 484 485 static inline pmd_t pmd_mkwrite(pmd_t pmd) 486 { 487 pmd_val(pmd) |= _PAGE_WRITE; 488 if (pmd_val(pmd) & _PAGE_MODIFIED) 489 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 490 491 return pmd; 492 } 493 494 static inline int pmd_dirty(pmd_t pmd) 495 { 496 return !!(pmd_val(pmd) & _PAGE_MODIFIED); 497 } 498 499 static inline pmd_t pmd_mkclean(pmd_t pmd) 500 { 501 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 502 return pmd; 503 } 504 505 static inline pmd_t pmd_mkdirty(pmd_t pmd) 506 { 507 pmd_val(pmd) |= _PAGE_MODIFIED; 508 if (pmd_val(pmd) & _PAGE_WRITE) 509 pmd_val(pmd) |= _PAGE_SILENT_WRITE; 510 511 return pmd; 512 } 513 514 static inline int pmd_young(pmd_t pmd) 515 { 516 return !!(pmd_val(pmd) & _PAGE_ACCESSED); 517 } 518 519 static inline pmd_t pmd_mkold(pmd_t pmd) 520 { 521 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 522 523 return pmd; 524 } 525 526 static inline pmd_t pmd_mkyoung(pmd_t pmd) 527 { 528 pmd_val(pmd) |= _PAGE_ACCESSED; 529 530 #ifdef CONFIG_CPU_MIPSR2 531 if (!(pmd_val(pmd) & _PAGE_NO_READ)) 532 pmd_val(pmd) |= _PAGE_SILENT_READ; 533 else 534 #endif 535 if (pmd_val(pmd) & _PAGE_READ) 536 pmd_val(pmd) |= _PAGE_SILENT_READ; 537 538 return pmd; 539 } 540 541 /* Extern to avoid header file madness */ 542 extern pmd_t mk_pmd(struct page *page, pgprot_t prot); 543 544 static inline unsigned long pmd_pfn(pmd_t pmd) 545 { 546 return pmd_val(pmd) >> _PFN_SHIFT; 547 } 548 549 static inline struct page *pmd_page(pmd_t pmd) 550 { 551 if (pmd_trans_huge(pmd)) 552 return pfn_to_page(pmd_pfn(pmd)); 553 554 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT); 555 } 556 557 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 558 { 559 pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot); 560 return pmd; 561 } 562 563 static inline pmd_t pmd_mknotpresent(pmd_t pmd) 564 { 565 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY); 566 567 return pmd; 568 } 569 570 /* 571 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a 572 * different prototype. 573 */ 574 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 575 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 576 unsigned long address, pmd_t *pmdp) 577 { 578 pmd_t old = *pmdp; 579 580 pmd_clear(pmdp); 581 582 return old; 583 } 584 585 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 586 587 #include <asm-generic/pgtable.h> 588 589 /* 590 * uncached accelerated TLB map for video memory access 591 */ 592 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED 593 #define __HAVE_PHYS_MEM_ACCESS_PROT 594 595 struct file; 596 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 597 unsigned long size, pgprot_t vma_prot); 598 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, 599 unsigned long size, pgprot_t *vma_prot); 600 #endif 601 602 /* 603 * We provide our own get_unmapped area to cope with the virtual aliasing 604 * constraints placed on us by the cache architecture. 605 */ 606 #define HAVE_ARCH_UNMAPPED_AREA 607 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 608 609 /* 610 * No page table caches to initialise 611 */ 612 #define pgtable_cache_init() do { } while (0) 613 614 #endif /* _ASM_PGTABLE_H */ 615