include/asm-mips/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/config.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
  22 struct mm_struct;
  23 struct vm_area_struct;
  24
  25 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
  26 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  27                         PAGE_CACHABLE_DEFAULT)
  28 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | \
  29                         PAGE_CACHABLE_DEFAULT)
  30 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _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 | _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  * MIPS can't do page protection for execute, and considers that the same like
  41  * read. Also, write permissions imply read permissions. This is the closest
  42  * we can get by reasonable means..
  43  */
  44 #define __P000  PAGE_NONE
  45 #define __P001  PAGE_READONLY
  46 #define __P010  PAGE_COPY
  47 #define __P011  PAGE_COPY
  48 #define __P100  PAGE_READONLY
  49 #define __P101  PAGE_READONLY
  50 #define __P110  PAGE_COPY
  51 #define __P111  PAGE_COPY
  52
  53 #define __S000  PAGE_NONE
  54 #define __S001  PAGE_READONLY
  55 #define __S010  PAGE_SHARED
  56 #define __S011  PAGE_SHARED
  57 #define __S100  PAGE_READONLY
  58 #define __S101  PAGE_READONLY
  59 #define __S110  PAGE_SHARED
  60 #define __S111  PAGE_SHARED
  61
  62 /*
  63  * ZERO_PAGE is a global shared page that is always zero; used
  64  * for zero-mapped memory areas etc..
  65  */
  66
  67 extern unsigned long empty_zero_page;
  68 extern unsigned long zero_page_mask;
  69
  70 #define ZERO_PAGE(vaddr) \
  71         (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
  72
  73 #define __HAVE_ARCH_MOVE_PTE
  74 #define move_pte(pte, prot, old_addr, new_addr)                         \
  75 ({                                                                      \
  76         pte_t newpte = (pte);                                           \
  77         if (pte_present(pte) && pfn_valid(pte_pfn(pte)) &&              \
  78                         pte_page(pte) == ZERO_PAGE(old_addr))           \
  79                 newpte = mk_pte(ZERO_PAGE(new_addr), (prot));           \
  80         newpte;                                                         \
  81 })
  82
  83 extern void paging_init(void);
  84
  85 /*
  86  * Conversion functions: convert a page and protection to a page entry,
  87  * and a page entry and page directory to the page they refer to.
  88  */
  89 #define pmd_phys(pmd)           (pmd_val(pmd) - PAGE_OFFSET)
  90 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  91 #define pmd_page_kernel(pmd)    pmd_val(pmd)
  92
  93 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
  94
  95 #define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
  96 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
  97
  98 static inline void set_pte(pte_t *ptep, pte_t pte)
  99 {
 100         ptep->pte_high = pte.pte_high;
 101         smp_wmb();
 102         ptep->pte_low = pte.pte_low;
 103         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
 104
 105         if (pte.pte_low & _PAGE_GLOBAL) {
 106                 pte_t *buddy = ptep_buddy(ptep);
 107                 /*
 108                  * Make sure the buddy is global too (if it's !none,
 109                  * it better already be global)
 110                  */
 111                 if (pte_none(*buddy)) {
 112                         buddy->pte_low  |= _PAGE_GLOBAL;
 113                         buddy->pte_high |= _PAGE_GLOBAL;
 114                 }
 115         }
 116 }
 117 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 118
 119 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 120 {
 121         pte_t null = __pte(0);
 122
 123         /* Preserve global status for the pair */
 124         if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 125                 null.pte_low = null.pte_high = _PAGE_GLOBAL;
 126
 127         set_pte_at(mm, addr, ptep, null);
 128 }
 129 #else
 130
 131 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 132 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 133
 134 /*
 135  * Certain architectures need to do special things when pte's
 136  * within a page table are directly modified.  Thus, the following
 137  * hook is made available.
 138  */
 139 static inline void set_pte(pte_t *ptep, pte_t pteval)
 140 {
 141         *ptep = pteval;
 142 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 143         if (pte_val(pteval) & _PAGE_GLOBAL) {
 144                 pte_t *buddy = ptep_buddy(ptep);
 145                 /*
 146                  * Make sure the buddy is global too (if it's !none,
 147                  * it better already be global)
 148                  */
 149                 if (pte_none(*buddy))
 150                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 151         }
 152 #endif
 153 }
 154 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 155
 156 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 157 {
 158 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 159         /* Preserve global status for the pair */
 160         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 161                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 162         else
 163 #endif
 164                 set_pte_at(mm, addr, ptep, __pte(0));
 165 }
 166 #endif
 167
 168 /*
 169  * (pmds are folded into puds so this doesn't get actually called,
 170  * but the define is needed for a generic inline function.)
 171  */
 172 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 173
 174 #ifdef CONFIG_64BIT
 175 /*
 176  * (puds are folded into pgds so this doesn't get actually called,
 177  * but the define is needed for a generic inline function.)
 178  */
 179 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 180 #endif
 181
 182 #define PGD_T_LOG2      ffz(~sizeof(pgd_t))
 183 #define PMD_T_LOG2      ffz(~sizeof(pmd_t))
 184 #define PTE_T_LOG2      ffz(~sizeof(pte_t))
 185
 186 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 187
 188 /*
 189  * The following only work if pte_present() is true.
 190  * Undefined behaviour if not..
 191  */
 192 static inline int pte_user(pte_t pte)   { BUG(); return 0; }
 193 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 194 static inline int pte_read(pte_t pte)   { return pte.pte_low & _PAGE_READ; }
 195 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 196 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 197 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 198 static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 199
 200 static inline pte_t pte_wrprotect(pte_t pte)
 201 {
 202         pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 203         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 204         return pte;
 205 }
 206
 207 static inline pte_t pte_rdprotect(pte_t pte)
 208 {
 209         pte.pte_low  &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 210         pte.pte_high &= ~_PAGE_SILENT_READ;
 211         return pte;
 212 }
 213
 214 static inline pte_t pte_mkclean(pte_t pte)
 215 {
 216         pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 217         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 218         return pte;
 219 }
 220
 221 static inline pte_t pte_mkold(pte_t pte)
 222 {
 223         pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 224         pte.pte_high &= ~_PAGE_SILENT_READ;
 225         return pte;
 226 }
 227
 228 static inline pte_t pte_mkwrite(pte_t pte)
 229 {
 230         pte.pte_low |= _PAGE_WRITE;
 231         if (pte.pte_low & _PAGE_MODIFIED) {
 232                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 233                 pte.pte_high |= _PAGE_SILENT_WRITE;
 234         }
 235         return pte;
 236 }
 237
 238 static inline pte_t pte_mkread(pte_t pte)
 239 {
 240         pte.pte_low |= _PAGE_READ;
 241         if (pte.pte_low & _PAGE_ACCESSED) {
 242                 pte.pte_low  |= _PAGE_SILENT_READ;
 243                 pte.pte_high |= _PAGE_SILENT_READ;
 244         }
 245         return pte;
 246 }
 247
 248 static inline pte_t pte_mkdirty(pte_t pte)
 249 {
 250         pte.pte_low |= _PAGE_MODIFIED;
 251         if (pte.pte_low & _PAGE_WRITE) {
 252                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 253                 pte.pte_high |= _PAGE_SILENT_WRITE;
 254         }
 255         return pte;
 256 }
 257
 258 static inline pte_t pte_mkyoung(pte_t pte)
 259 {
 260         pte.pte_low |= _PAGE_ACCESSED;
 261         if (pte.pte_low & _PAGE_READ)
 262                 pte.pte_low  |= _PAGE_SILENT_READ;
 263                 pte.pte_high |= _PAGE_SILENT_READ;
 264         return pte;
 265 }
 266 #else
 267 static inline int pte_read(pte_t pte)   { return pte_val(pte) & _PAGE_READ; }
 268 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 269 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 270 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 271 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 272
 273 static inline pte_t pte_wrprotect(pte_t pte)
 274 {
 275         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 276         return pte;
 277 }
 278
 279 static inline pte_t pte_rdprotect(pte_t pte)
 280 {
 281         pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 282         return pte;
 283 }
 284
 285 static inline pte_t pte_mkclean(pte_t pte)
 286 {
 287         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 288         return pte;
 289 }
 290
 291 static inline pte_t pte_mkold(pte_t pte)
 292 {
 293         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 294         return pte;
 295 }
 296
 297 static inline pte_t pte_mkwrite(pte_t pte)
 298 {
 299         pte_val(pte) |= _PAGE_WRITE;
 300         if (pte_val(pte) & _PAGE_MODIFIED)
 301                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 302         return pte;
 303 }
 304
 305 static inline pte_t pte_mkread(pte_t pte)
 306 {
 307         pte_val(pte) |= _PAGE_READ;
 308         if (pte_val(pte) & _PAGE_ACCESSED)
 309                 pte_val(pte) |= _PAGE_SILENT_READ;
 310         return pte;
 311 }
 312
 313 static inline pte_t pte_mkdirty(pte_t pte)
 314 {
 315         pte_val(pte) |= _PAGE_MODIFIED;
 316         if (pte_val(pte) & _PAGE_WRITE)
 317                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 318         return pte;
 319 }
 320
 321 static inline pte_t pte_mkyoung(pte_t pte)
 322 {
 323         pte_val(pte) |= _PAGE_ACCESSED;
 324         if (pte_val(pte) & _PAGE_READ)
 325                 pte_val(pte) |= _PAGE_SILENT_READ;
 326         return pte;
 327 }
 328 #endif
 329
 330 /*
 331  * Macro to make mark a page protection value as "uncacheable".  Note
 332  * that "protection" is really a misnomer here as the protection value
 333  * contains the memory attribute bits, dirty bits, and various other
 334  * bits as well.
 335  */
 336 #define pgprot_noncached pgprot_noncached
 337
 338 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 339 {
 340         unsigned long prot = pgprot_val(_prot);
 341
 342         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 343
 344         return __pgprot(prot);
 345 }
 346
 347 /*
 348  * Conversion functions: convert a page and protection to a page entry,
 349  * and a page entry and page directory to the page they refer to.
 350  */
 351 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 352
 353 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 354 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 355 {
 356         pte.pte_low  &= _PAGE_CHG_MASK;
 357         pte.pte_high &= ~0x3f;
 358         pte.pte_low  |= pgprot_val(newprot);
 359         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 360         return pte;
 361 }
 362 #else
 363 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 364 {
 365         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 366 }
 367 #endif
 368
 369
 370 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 371         pte_t pte);
 372 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 373         pte_t pte);
 374
 375 static inline void update_mmu_cache(struct vm_area_struct *vma,
 376         unsigned long address, pte_t pte)
 377 {
 378         __update_tlb(vma, address, pte);
 379         __update_cache(vma, address, pte);
 380 }
 381
 382 #ifndef CONFIG_NEED_MULTIPLE_NODES
 383 #define kern_addr_valid(addr)   (1)
 384 #endif
 385
 386 #ifdef CONFIG_64BIT_PHYS_ADDR
 387 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 388
 389 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 390                 unsigned long vaddr,
 391                 unsigned long pfn,
 392                 unsigned long size,
 393                 pgprot_t prot)
 394 {
 395         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 396         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 397 }
 398 #else
 399 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 400                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 401 #endif
 402
 403 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 404 #define GET_IOSPACE(pfn)                0
 405 #define GET_PFN(pfn)                    (pfn)
 406
 407 #include <asm-generic/pgtable.h>
 408
 409 /*
 410  * We provide our own get_unmapped area to cope with the virtual aliasing
 411  * constraints placed on us by the cache architecture.
 412  */
 413 #define HAVE_ARCH_UNMAPPED_AREA
 414
 415 /*
 416  * No page table caches to initialise
 417  */
 418 #define pgtable_cache_init()    do { } while (0)
 419
 420 #endif /* _ASM_PGTABLE_H */