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 #ifdef CONFIG_32BIT 12 #include <asm/pgtable-32.h> 13 #endif 14 #ifdef CONFIG_64BIT 15 #include <asm/pgtable-64.h> 16 #endif 17 18 #include <asm/io.h> 19 #include <asm/pgtable-bits.h> 20 21 struct mm_struct; 22 struct vm_area_struct; 23 24 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT) 25 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \ 26 _page_cachable_default) 27 #define PAGE_COPY __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \ 28 (kernel_uses_smartmips_rixi ? _PAGE_NO_EXEC : 0) | _page_cachable_default) 29 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \ 30 _page_cachable_default) 31 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 32 _PAGE_GLOBAL | _page_cachable_default) 33 #define PAGE_USERIO __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \ 34 _page_cachable_default) 35 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ 36 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) 37 38 /* 39 * If _PAGE_NO_EXEC is not defined, we can't do page protection for 40 * execute, and consider it to be the same as read. Also, write 41 * permissions imply read permissions. This is the closest we can get 42 * by reasonable means.. 43 */ 44 45 /* 46 * Dummy values to fill the table in mmap.c 47 * The real values will be generated at runtime 48 */ 49 #define __P000 __pgprot(0) 50 #define __P001 __pgprot(0) 51 #define __P010 __pgprot(0) 52 #define __P011 __pgprot(0) 53 #define __P100 __pgprot(0) 54 #define __P101 __pgprot(0) 55 #define __P110 __pgprot(0) 56 #define __P111 __pgprot(0) 57 58 #define __S000 __pgprot(0) 59 #define __S001 __pgprot(0) 60 #define __S010 __pgprot(0) 61 #define __S011 __pgprot(0) 62 #define __S100 __pgprot(0) 63 #define __S101 __pgprot(0) 64 #define __S110 __pgprot(0) 65 #define __S111 __pgprot(0) 66 67 extern unsigned long _page_cachable_default; 68 69 /* 70 * ZERO_PAGE is a global shared page that is always zero; used 71 * for zero-mapped memory areas etc.. 72 */ 73 74 extern unsigned long empty_zero_page; 75 extern unsigned long zero_page_mask; 76 77 #define ZERO_PAGE(vaddr) \ 78 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 79 80 #define is_zero_pfn is_zero_pfn 81 static inline int is_zero_pfn(unsigned long pfn) 82 { 83 extern unsigned long zero_pfn; 84 unsigned long offset_from_zero_pfn = pfn - zero_pfn; 85 return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); 86 } 87 88 #define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr)) 89 90 extern void paging_init(void); 91 92 /* 93 * Conversion functions: convert a page and protection to a page entry, 94 * and a page entry and page directory to the page they refer to. 95 */ 96 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 97 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 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) 104 105 static 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 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low); 111 112 if (pte.pte_low & _PAGE_GLOBAL) { 113 pte_t *buddy = ptep_buddy(ptep); 114 /* 115 * Make sure the buddy is global too (if it's !none, 116 * it better already be global) 117 */ 118 if (pte_none(*buddy)) { 119 buddy->pte_low |= _PAGE_GLOBAL; 120 buddy->pte_high |= _PAGE_GLOBAL; 121 } 122 } 123 } 124 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 125 126 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 127 { 128 pte_t null = __pte(0); 129 130 /* Preserve global status for the pair */ 131 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 132 null.pte_low = null.pte_high = _PAGE_GLOBAL; 133 134 set_pte_at(mm, addr, ptep, null); 135 } 136 #else 137 138 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 139 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 140 141 /* 142 * Certain architectures need to do special things when pte's 143 * within a page table are directly modified. Thus, the following 144 * hook is made available. 145 */ 146 static inline void set_pte(pte_t *ptep, pte_t pteval) 147 { 148 *ptep = pteval; 149 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 150 if (pte_val(pteval) & _PAGE_GLOBAL) { 151 pte_t *buddy = ptep_buddy(ptep); 152 /* 153 * Make sure the buddy is global too (if it's !none, 154 * it better already be global) 155 */ 156 if (pte_none(*buddy)) 157 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 158 } 159 #endif 160 } 161 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) 162 163 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 164 { 165 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 166 /* Preserve global status for the pair */ 167 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 168 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 169 else 170 #endif 171 set_pte_at(mm, addr, ptep, __pte(0)); 172 } 173 #endif 174 175 /* 176 * (pmds are folded into puds so this doesn't get actually called, 177 * but the define is needed for a generic inline function.) 178 */ 179 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 180 181 #ifndef __PAGETABLE_PMD_FOLDED 182 /* 183 * (puds are folded into pgds so this doesn't get actually called, 184 * but the define is needed for a generic inline function.) 185 */ 186 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 187 #endif 188 189 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1) 190 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1) 191 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1) 192 193 /* 194 * We used to declare this array with size but gcc 3.3 and older are not able 195 * to find that this expression is a constant, so the size is dropped. 196 */ 197 extern pgd_t swapper_pg_dir[]; 198 199 /* 200 * The following only work if pte_present() is true. 201 * Undefined behaviour if not.. 202 */ 203 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 204 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 205 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 206 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 207 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } 208 209 static inline pte_t pte_wrprotect(pte_t pte) 210 { 211 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 212 pte.pte_high &= ~_PAGE_SILENT_WRITE; 213 return pte; 214 } 215 216 static inline pte_t pte_mkclean(pte_t pte) 217 { 218 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 219 pte.pte_high &= ~_PAGE_SILENT_WRITE; 220 return pte; 221 } 222 223 static inline pte_t pte_mkold(pte_t pte) 224 { 225 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 226 pte.pte_high &= ~_PAGE_SILENT_READ; 227 return pte; 228 } 229 230 static inline pte_t pte_mkwrite(pte_t pte) 231 { 232 pte.pte_low |= _PAGE_WRITE; 233 if (pte.pte_low & _PAGE_MODIFIED) { 234 pte.pte_low |= _PAGE_SILENT_WRITE; 235 pte.pte_high |= _PAGE_SILENT_WRITE; 236 } 237 return pte; 238 } 239 240 static inline pte_t pte_mkdirty(pte_t pte) 241 { 242 pte.pte_low |= _PAGE_MODIFIED; 243 if (pte.pte_low & _PAGE_WRITE) { 244 pte.pte_low |= _PAGE_SILENT_WRITE; 245 pte.pte_high |= _PAGE_SILENT_WRITE; 246 } 247 return pte; 248 } 249 250 static inline pte_t pte_mkyoung(pte_t pte) 251 { 252 pte.pte_low |= _PAGE_ACCESSED; 253 if (pte.pte_low & _PAGE_READ) { 254 pte.pte_low |= _PAGE_SILENT_READ; 255 pte.pte_high |= _PAGE_SILENT_READ; 256 } 257 return pte; 258 } 259 #else 260 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 261 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 262 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 263 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 264 265 static inline pte_t pte_wrprotect(pte_t pte) 266 { 267 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 268 return pte; 269 } 270 271 static inline pte_t pte_mkclean(pte_t pte) 272 { 273 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); 274 return pte; 275 } 276 277 static inline pte_t pte_mkold(pte_t pte) 278 { 279 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 280 return pte; 281 } 282 283 static inline pte_t pte_mkwrite(pte_t pte) 284 { 285 pte_val(pte) |= _PAGE_WRITE; 286 if (pte_val(pte) & _PAGE_MODIFIED) 287 pte_val(pte) |= _PAGE_SILENT_WRITE; 288 return pte; 289 } 290 291 static inline pte_t pte_mkdirty(pte_t pte) 292 { 293 pte_val(pte) |= _PAGE_MODIFIED; 294 if (pte_val(pte) & _PAGE_WRITE) 295 pte_val(pte) |= _PAGE_SILENT_WRITE; 296 return pte; 297 } 298 299 static inline pte_t pte_mkyoung(pte_t pte) 300 { 301 pte_val(pte) |= _PAGE_ACCESSED; 302 if (kernel_uses_smartmips_rixi) { 303 if (!(pte_val(pte) & _PAGE_NO_READ)) 304 pte_val(pte) |= _PAGE_SILENT_READ; 305 } else { 306 if (pte_val(pte) & _PAGE_READ) 307 pte_val(pte) |= _PAGE_SILENT_READ; 308 } 309 return pte; 310 } 311 312 #ifdef _PAGE_HUGE 313 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; } 314 315 static inline pte_t pte_mkhuge(pte_t pte) 316 { 317 pte_val(pte) |= _PAGE_HUGE; 318 return pte; 319 } 320 #endif /* _PAGE_HUGE */ 321 #endif 322 static inline int pte_special(pte_t pte) { return 0; } 323 static inline pte_t pte_mkspecial(pte_t pte) { return pte; } 324 325 /* 326 * Macro to make mark a page protection value as "uncacheable". Note 327 * that "protection" is really a misnomer here as the protection value 328 * contains the memory attribute bits, dirty bits, and various other 329 * bits as well. 330 */ 331 #define pgprot_noncached pgprot_noncached 332 333 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 334 { 335 unsigned long prot = pgprot_val(_prot); 336 337 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 338 339 return __pgprot(prot); 340 } 341 342 /* 343 * Conversion functions: convert a page and protection to a page entry, 344 * and a page entry and page directory to the page they refer to. 345 */ 346 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 347 348 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) 349 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 350 { 351 pte.pte_low &= _PAGE_CHG_MASK; 352 pte.pte_high &= ~0x3f; 353 pte.pte_low |= pgprot_val(newprot); 354 pte.pte_high |= pgprot_val(newprot) & 0x3f; 355 return pte; 356 } 357 #else 358 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 359 { 360 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 361 } 362 #endif 363 364 365 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 366 pte_t pte); 367 extern void __update_cache(struct vm_area_struct *vma, unsigned long address, 368 pte_t pte); 369 370 static inline void update_mmu_cache(struct vm_area_struct *vma, 371 unsigned long address, pte_t *ptep) 372 { 373 pte_t pte = *ptep; 374 __update_tlb(vma, address, pte); 375 __update_cache(vma, address, pte); 376 } 377 378 #define kern_addr_valid(addr) (1) 379 380 #ifdef CONFIG_64BIT_PHYS_ADDR 381 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 382 383 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 384 unsigned long vaddr, 385 unsigned long pfn, 386 unsigned long size, 387 pgprot_t prot) 388 { 389 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 390 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 391 } 392 #else 393 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 394 remap_pfn_range(vma, vaddr, pfn, size, prot) 395 #endif 396 397 #include <asm-generic/pgtable.h> 398 399 /* 400 * uncached accelerated TLB map for video memory access 401 */ 402 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED 403 #define __HAVE_PHYS_MEM_ACCESS_PROT 404 405 struct file; 406 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 407 unsigned long size, pgprot_t vma_prot); 408 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, 409 unsigned long size, pgprot_t *vma_prot); 410 #endif 411 412 /* 413 * We provide our own get_unmapped area to cope with the virtual aliasing 414 * constraints placed on us by the cache architecture. 415 */ 416 #define HAVE_ARCH_UNMAPPED_AREA 417 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 418 419 /* 420 * No page table caches to initialise 421 */ 422 #define pgtable_cache_init() do { } while (0) 423 424 #endif /* _ASM_PGTABLE_H */ 425