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_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
 418 /*
 419  * No page table caches to initialise
 420  */
 421 #define pgtable_cache_init()    do { } while (0)
 422
 423 #endif /* _ASM_PGTABLE_H */