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 #define is_zero_pfn is_zero_pfn
  80 static inline int is_zero_pfn(unsigned long pfn)
  81 {
  82         extern unsigned long zero_pfn;
  83         unsigned long offset_from_zero_pfn = pfn - zero_pfn;
  84         return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
  85 }
  86
  87 #define my_zero_pfn(addr)       page_to_pfn(ZERO_PAGE(addr))
  88
  89 extern void paging_init(void);
  90
  91 /*
  92  * Conversion functions: convert a page and protection to a page entry,
  93  * and a page entry and page directory to the page they refer to.
  94  */
  95 #define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  96 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  97 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
  98
  99 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 100
 101 #define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
 102 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 103
 104 static inline void set_pte(pte_t *ptep, pte_t pte)
 105 {
 106         ptep->pte_high = pte.pte_high;
 107         smp_wmb();
 108         ptep->pte_low = pte.pte_low;
 109         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
 110
 111         if (pte.pte_low & _PAGE_GLOBAL) {
 112                 pte_t *buddy = ptep_buddy(ptep);
 113                 /*
 114                  * Make sure the buddy is global too (if it's !none,
 115                  * it better already be global)
 116                  */
 117                 if (pte_none(*buddy)) {
 118                         buddy->pte_low  |= _PAGE_GLOBAL;
 119                         buddy->pte_high |= _PAGE_GLOBAL;
 120                 }
 121         }
 122 }
 123 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 124
 125 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 126 {
 127         pte_t null = __pte(0);
 128
 129         /* Preserve global status for the pair */
 130         if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 131                 null.pte_low = null.pte_high = _PAGE_GLOBAL;
 132
 133         set_pte_at(mm, addr, ptep, null);
 134 }
 135 #else
 136
 137 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 138 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 139
 140 /*
 141  * Certain architectures need to do special things when pte's
 142  * within a page table are directly modified.  Thus, the following
 143  * hook is made available.
 144  */
 145 static inline void set_pte(pte_t *ptep, pte_t pteval)
 146 {
 147         *ptep = pteval;
 148 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 149         if (pte_val(pteval) & _PAGE_GLOBAL) {
 150                 pte_t *buddy = ptep_buddy(ptep);
 151                 /*
 152                  * Make sure the buddy is global too (if it's !none,
 153                  * it better already be global)
 154                  */
 155                 if (pte_none(*buddy))
 156                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 157         }
 158 #endif
 159 }
 160 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 161
 162 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 163 {
 164 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 165         /* Preserve global status for the pair */
 166         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 167                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 168         else
 169 #endif
 170                 set_pte_at(mm, addr, ptep, __pte(0));
 171 }
 172 #endif
 173
 174 /*
 175  * (pmds are folded into puds so this doesn't get actually called,
 176  * but the define is needed for a generic inline function.)
 177  */
 178 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 179
 180 #ifdef CONFIG_64BIT
 181 /*
 182  * (puds are folded into pgds so this doesn't get actually called,
 183  * but the define is needed for a generic inline function.)
 184  */
 185 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 186 #endif
 187
 188 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 189 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 190 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 191
 192 /*
 193  * We used to declare this array with size but gcc 3.3 and older are not able
 194  * to find that this expression is a constant, so the size is dropped.
 195  */
 196 extern pgd_t swapper_pg_dir[];
 197
 198 /*
 199  * The following only work if pte_present() is true.
 200  * Undefined behaviour if not..
 201  */
 202 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 203 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 204 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 205 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 206 static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 207
 208 static inline pte_t pte_wrprotect(pte_t pte)
 209 {
 210         pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 211         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 212         return pte;
 213 }
 214
 215 static inline pte_t pte_mkclean(pte_t pte)
 216 {
 217         pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 218         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 219         return pte;
 220 }
 221
 222 static inline pte_t pte_mkold(pte_t pte)
 223 {
 224         pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 225         pte.pte_high &= ~_PAGE_SILENT_READ;
 226         return pte;
 227 }
 228
 229 static inline pte_t pte_mkwrite(pte_t pte)
 230 {
 231         pte.pte_low |= _PAGE_WRITE;
 232         if (pte.pte_low & _PAGE_MODIFIED) {
 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_mkdirty(pte_t pte)
 240 {
 241         pte.pte_low |= _PAGE_MODIFIED;
 242         if (pte.pte_low & _PAGE_WRITE) {
 243                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 244                 pte.pte_high |= _PAGE_SILENT_WRITE;
 245         }
 246         return pte;
 247 }
 248
 249 static inline pte_t pte_mkyoung(pte_t pte)
 250 {
 251         pte.pte_low |= _PAGE_ACCESSED;
 252         if (pte.pte_low & _PAGE_READ) {
 253                 pte.pte_low  |= _PAGE_SILENT_READ;
 254                 pte.pte_high |= _PAGE_SILENT_READ;
 255         }
 256         return pte;
 257 }
 258 #else
 259 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 260 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 261 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 262 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 263
 264 static inline pte_t pte_wrprotect(pte_t pte)
 265 {
 266         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 267         return pte;
 268 }
 269
 270 static inline pte_t pte_mkclean(pte_t pte)
 271 {
 272         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 273         return pte;
 274 }
 275
 276 static inline pte_t pte_mkold(pte_t pte)
 277 {
 278         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 279         return pte;
 280 }
 281
 282 static inline pte_t pte_mkwrite(pte_t pte)
 283 {
 284         pte_val(pte) |= _PAGE_WRITE;
 285         if (pte_val(pte) & _PAGE_MODIFIED)
 286                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 287         return pte;
 288 }
 289
 290 static inline pte_t pte_mkdirty(pte_t pte)
 291 {
 292         pte_val(pte) |= _PAGE_MODIFIED;
 293         if (pte_val(pte) & _PAGE_WRITE)
 294                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 295         return pte;
 296 }
 297
 298 static inline pte_t pte_mkyoung(pte_t pte)
 299 {
 300         pte_val(pte) |= _PAGE_ACCESSED;
 301         if (pte_val(pte) & _PAGE_READ)
 302                 pte_val(pte) |= _PAGE_SILENT_READ;
 303         return pte;
 304 }
 305
 306 #ifdef _PAGE_HUGE
 307 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 308
 309 static inline pte_t pte_mkhuge(pte_t pte)
 310 {
 311         pte_val(pte) |= _PAGE_HUGE;
 312         return pte;
 313 }
 314 #endif /* _PAGE_HUGE */
 315 #endif
 316 static inline int pte_special(pte_t pte)        { return 0; }
 317 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 318
 319 /*
 320  * Macro to make mark a page protection value as "uncacheable".  Note
 321  * that "protection" is really a misnomer here as the protection value
 322  * contains the memory attribute bits, dirty bits, and various other
 323  * bits as well.
 324  */
 325 #define pgprot_noncached pgprot_noncached
 326
 327 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 328 {
 329         unsigned long prot = pgprot_val(_prot);
 330
 331         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 332
 333         return __pgprot(prot);
 334 }
 335
 336 /*
 337  * Conversion functions: convert a page and protection to a page entry,
 338  * and a page entry and page directory to the page they refer to.
 339  */
 340 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 341
 342 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 343 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 344 {
 345         pte.pte_low  &= _PAGE_CHG_MASK;
 346         pte.pte_high &= ~0x3f;
 347         pte.pte_low  |= pgprot_val(newprot);
 348         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 349         return pte;
 350 }
 351 #else
 352 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 353 {
 354         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 355 }
 356 #endif
 357
 358
 359 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 360         pte_t pte);
 361 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 362         pte_t pte);
 363
 364 static inline void update_mmu_cache(struct vm_area_struct *vma,
 365         unsigned long address, pte_t pte)
 366 {
 367         __update_tlb(vma, address, pte);
 368         __update_cache(vma, address, pte);
 369 }
 370
 371 #define kern_addr_valid(addr)   (1)
 372
 373 #ifdef CONFIG_64BIT_PHYS_ADDR
 374 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 375
 376 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 377                 unsigned long vaddr,
 378                 unsigned long pfn,
 379                 unsigned long size,
 380                 pgprot_t prot)
 381 {
 382         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 383         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 384 }
 385 #else
 386 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 387                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 388 #endif
 389
 390 #include <asm-generic/pgtable.h>
 391
 392 /*
 393  * We provide our own get_unmapped area to cope with the virtual aliasing
 394  * constraints placed on us by the cache architecture.
 395  */
 396 #define HAVE_ARCH_UNMAPPED_AREA
 397
 398 /*
 399  * No page table caches to initialise
 400  */
 401 #define pgtable_cache_init()    do { } while (0)
 402
 403 #endif /* _ASM_PGTABLE_H */