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 #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_READ | _PAGE_WRITE | \
  26                                  _page_cachable_default)
  27 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | \
  28                                  _page_cachable_default)
  29 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _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 | _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  * MIPS can't do page protection for execute, and considers that the same like
  40  * read. Also, write permissions imply read permissions. This is the closest
  41  * we can get by reasonable means..
  42  */
  43
  44 /*
  45  * Dummy values to fill the table in mmap.c
  46  * The real values will be generated at runtime
  47  */
  48 #define __P000 __pgprot(0)
  49 #define __P001 __pgprot(0)
  50 #define __P010 __pgprot(0)
  51 #define __P011 __pgprot(0)
  52 #define __P100 __pgprot(0)
  53 #define __P101 __pgprot(0)
  54 #define __P110 __pgprot(0)
  55 #define __P111 __pgprot(0)
  56
  57 #define __S000 __pgprot(0)
  58 #define __S001 __pgprot(0)
  59 #define __S010 __pgprot(0)
  60 #define __S011 __pgprot(0)
  61 #define __S100 __pgprot(0)
  62 #define __S101 __pgprot(0)
  63 #define __S110 __pgprot(0)
  64 #define __S111 __pgprot(0)
  65
  66 extern unsigned long _page_cachable_default;
  67
  68 /*
  69  * ZERO_PAGE is a global shared page that is always zero; used
  70  * for zero-mapped memory areas etc..
  71  */
  72
  73 extern unsigned long empty_zero_page;
  74 extern unsigned long zero_page_mask;
  75
  76 #define ZERO_PAGE(vaddr) \
  77         (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  78
  79 extern void paging_init(void);
  80
  81 /*
  82  * Conversion functions: convert a page and protection to a page entry,
  83  * and a page entry and page directory to the page they refer to.
  84  */
  85 #define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  86 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  87 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
  88
  89 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
  90
  91 #define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
  92 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
  93
  94 static inline void set_pte(pte_t *ptep, pte_t pte)
  95 {
  96         ptep->pte_high = pte.pte_high;
  97         smp_wmb();
  98         ptep->pte_low = pte.pte_low;
  99         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
 100
 101         if (pte.pte_low & _PAGE_GLOBAL) {
 102                 pte_t *buddy = ptep_buddy(ptep);
 103                 /*
 104                  * Make sure the buddy is global too (if it's !none,
 105                  * it better already be global)
 106                  */
 107                 if (pte_none(*buddy)) {
 108                         buddy->pte_low  |= _PAGE_GLOBAL;
 109                         buddy->pte_high |= _PAGE_GLOBAL;
 110                 }
 111         }
 112 }
 113 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 114
 115 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 116 {
 117         pte_t null = __pte(0);
 118
 119         /* Preserve global status for the pair */
 120         if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 121                 null.pte_low = null.pte_high = _PAGE_GLOBAL;
 122
 123         set_pte_at(mm, addr, ptep, null);
 124 }
 125 #else
 126
 127 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 128 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 129
 130 /*
 131  * Certain architectures need to do special things when pte's
 132  * within a page table are directly modified.  Thus, the following
 133  * hook is made available.
 134  */
 135 static inline void set_pte(pte_t *ptep, pte_t pteval)
 136 {
 137         *ptep = pteval;
 138 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 139         if (pte_val(pteval) & _PAGE_GLOBAL) {
 140                 pte_t *buddy = ptep_buddy(ptep);
 141                 /*
 142                  * Make sure the buddy is global too (if it's !none,
 143                  * it better already be global)
 144                  */
 145                 if (pte_none(*buddy))
 146                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 147         }
 148 #endif
 149 }
 150 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 151
 152 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 153 {
 154 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 155         /* Preserve global status for the pair */
 156         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 157                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 158         else
 159 #endif
 160                 set_pte_at(mm, addr, ptep, __pte(0));
 161 }
 162 #endif
 163
 164 /*
 165  * (pmds are folded into puds so this doesn't get actually called,
 166  * but the define is needed for a generic inline function.)
 167  */
 168 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 169
 170 #ifdef CONFIG_64BIT
 171 /*
 172  * (puds are folded into pgds so this doesn't get actually called,
 173  * but the define is needed for a generic inline function.)
 174  */
 175 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 176 #endif
 177
 178 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 179 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 180 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 181
 182 /*
 183  * We used to declare this array with size but gcc 3.3 and older are not able
 184  * to find that this expression is a constant, so the size is dropped.
 185  */
 186 extern pgd_t swapper_pg_dir[];
 187
 188 /*
 189  * The following only work if pte_present() is true.
 190  * Undefined behaviour if not..
 191  */
 192 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 193 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 194 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 195 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 196 static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 197
 198 static inline pte_t pte_wrprotect(pte_t pte)
 199 {
 200         pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 201         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 202         return pte;
 203 }
 204
 205 static inline pte_t pte_mkclean(pte_t pte)
 206 {
 207         pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 208         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 209         return pte;
 210 }
 211
 212 static inline pte_t pte_mkold(pte_t pte)
 213 {
 214         pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 215         pte.pte_high &= ~_PAGE_SILENT_READ;
 216         return pte;
 217 }
 218
 219 static inline pte_t pte_mkwrite(pte_t pte)
 220 {
 221         pte.pte_low |= _PAGE_WRITE;
 222         if (pte.pte_low & _PAGE_MODIFIED) {
 223                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 224                 pte.pte_high |= _PAGE_SILENT_WRITE;
 225         }
 226         return pte;
 227 }
 228
 229 static inline pte_t pte_mkdirty(pte_t pte)
 230 {
 231         pte.pte_low |= _PAGE_MODIFIED;
 232         if (pte.pte_low & _PAGE_WRITE) {
 233                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 234                 pte.pte_high |= _PAGE_SILENT_WRITE;
 235         }
 236         return pte;
 237 }
 238
 239 static inline pte_t pte_mkyoung(pte_t pte)
 240 {
 241         pte.pte_low |= _PAGE_ACCESSED;
 242         if (pte.pte_low & _PAGE_READ) {
 243                 pte.pte_low  |= _PAGE_SILENT_READ;
 244                 pte.pte_high |= _PAGE_SILENT_READ;
 245         }
 246         return pte;
 247 }
 248 #else
 249 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 250 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 251 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 252 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 253
 254 static inline pte_t pte_wrprotect(pte_t pte)
 255 {
 256         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 257         return pte;
 258 }
 259
 260 static inline pte_t pte_mkclean(pte_t pte)
 261 {
 262         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 263         return pte;
 264 }
 265
 266 static inline pte_t pte_mkold(pte_t pte)
 267 {
 268         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 269         return pte;
 270 }
 271
 272 static inline pte_t pte_mkwrite(pte_t pte)
 273 {
 274         pte_val(pte) |= _PAGE_WRITE;
 275         if (pte_val(pte) & _PAGE_MODIFIED)
 276                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 277         return pte;
 278 }
 279
 280 static inline pte_t pte_mkdirty(pte_t pte)
 281 {
 282         pte_val(pte) |= _PAGE_MODIFIED;
 283         if (pte_val(pte) & _PAGE_WRITE)
 284                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 285         return pte;
 286 }
 287
 288 static inline pte_t pte_mkyoung(pte_t pte)
 289 {
 290         pte_val(pte) |= _PAGE_ACCESSED;
 291         if (pte_val(pte) & _PAGE_READ)
 292                 pte_val(pte) |= _PAGE_SILENT_READ;
 293         return pte;
 294 }
 295
 296 #ifdef _PAGE_HUGE
 297 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 298
 299 static inline pte_t pte_mkhuge(pte_t pte)
 300 {
 301         pte_val(pte) |= _PAGE_HUGE;
 302         return pte;
 303 }
 304 #endif /* _PAGE_HUGE */
 305 #endif
 306 static inline int pte_special(pte_t pte)        { return 0; }
 307 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 308
 309 /*
 310  * Macro to make mark a page protection value as "uncacheable".  Note
 311  * that "protection" is really a misnomer here as the protection value
 312  * contains the memory attribute bits, dirty bits, and various other
 313  * bits as well.
 314  */
 315 #define pgprot_noncached pgprot_noncached
 316
 317 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 318 {
 319         unsigned long prot = pgprot_val(_prot);
 320
 321         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 322
 323         return __pgprot(prot);
 324 }
 325
 326 /*
 327  * Conversion functions: convert a page and protection to a page entry,
 328  * and a page entry and page directory to the page they refer to.
 329  */
 330 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 331
 332 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 333 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 334 {
 335         pte.pte_low  &= _PAGE_CHG_MASK;
 336         pte.pte_high &= ~0x3f;
 337         pte.pte_low  |= pgprot_val(newprot);
 338         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 339         return pte;
 340 }
 341 #else
 342 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 343 {
 344         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 345 }
 346 #endif
 347
 348
 349 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 350         pte_t pte);
 351 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 352         pte_t pte);
 353
 354 static inline void update_mmu_cache(struct vm_area_struct *vma,
 355         unsigned long address, pte_t pte)
 356 {
 357         __update_tlb(vma, address, pte);
 358         __update_cache(vma, address, pte);
 359 }
 360
 361 #define kern_addr_valid(addr)   (1)
 362
 363 #ifdef CONFIG_64BIT_PHYS_ADDR
 364 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 365
 366 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 367                 unsigned long vaddr,
 368                 unsigned long pfn,
 369                 unsigned long size,
 370                 pgprot_t prot)
 371 {
 372         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 373         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 374 }
 375 #else
 376 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 377                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 378 #endif
 379
 380 #include <asm-generic/pgtable.h>
 381
 382 /*
 383  * We provide our own get_unmapped area to cope with the virtual aliasing
 384  * constraints placed on us by the cache architecture.
 385  */
 386 #define HAVE_ARCH_UNMAPPED_AREA
 387
 388 /*
 389  * No page table caches to initialise
 390  */
 391 #define pgtable_cache_init()    do { } while (0)
 392
 393 #endif /* _ASM_PGTABLE_H */