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 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
  23 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  24                         PAGE_CACHABLE_DEFAULT)
  25 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | \
  26                         PAGE_CACHABLE_DEFAULT)
  27 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | \
  28                         PAGE_CACHABLE_DEFAULT)
  29 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  30                         _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
  31 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  32                         PAGE_CACHABLE_DEFAULT)
  33 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
  34                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
  35
  36 /*
  37  * MIPS can't do page protection for execute, and considers that the same like
  38  * read. Also, write permissions imply read permissions. This is the closest
  39  * we can get by reasonable means..
  40  */
  41 #define __P000  PAGE_NONE
  42 #define __P001  PAGE_READONLY
  43 #define __P010  PAGE_COPY
  44 #define __P011  PAGE_COPY
  45 #define __P100  PAGE_READONLY
  46 #define __P101  PAGE_READONLY
  47 #define __P110  PAGE_COPY
  48 #define __P111  PAGE_COPY
  49
  50 #define __S000  PAGE_NONE
  51 #define __S001  PAGE_READONLY
  52 #define __S010  PAGE_SHARED
  53 #define __S011  PAGE_SHARED
  54 #define __S100  PAGE_READONLY
  55 #define __S101  PAGE_READONLY
  56 #define __S110  PAGE_SHARED
  57 #define __S111  PAGE_SHARED
  58
  59 /*
  60  * ZERO_PAGE is a global shared page that is always zero; used
  61  * for zero-mapped memory areas etc..
  62  */
  63
  64 extern unsigned long empty_zero_page;
  65 extern unsigned long zero_page_mask;
  66
  67 #define ZERO_PAGE(vaddr) \
  68         (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
  69
  70 #define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
  71
  72 extern void paging_init(void);
  73
  74 /*
  75  * Conversion functions: convert a page and protection to a page entry,
  76  * and a page entry and page directory to the page they refer to.
  77  */
  78 #define pmd_phys(pmd)           (pmd_val(pmd) - PAGE_OFFSET)
  79 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  80 #define pmd_page_kernel(pmd)    pmd_val(pmd)
  81
  82 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
  83 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
  84
  85 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
  86 static inline void set_pte(pte_t *ptep, pte_t pte)
  87 {
  88         ptep->pte_high = pte.pte_high;
  89         smp_wmb();
  90         ptep->pte_low = pte.pte_low;
  91         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
  92
  93         if (pte_val(pte) & _PAGE_GLOBAL) {
  94                 pte_t *buddy = ptep_buddy(ptep);
  95                 /*
  96                  * Make sure the buddy is global too (if it's !none,
  97                  * it better already be global)
  98                  */
  99                 if (pte_none(*buddy))
 100                         buddy->pte_low |= _PAGE_GLOBAL;
 101         }
 102 }
 103 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 104
 105 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 106 {
 107         /* Preserve global status for the pair */
 108         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 109                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 110         else
 111                 set_pte_at(mm, addr, ptep, __pte(0));
 112 }
 113 #else
 114 /*
 115  * Certain architectures need to do special things when pte's
 116  * within a page table are directly modified.  Thus, the following
 117  * hook is made available.
 118  */
 119 static inline void set_pte(pte_t *ptep, pte_t pteval)
 120 {
 121         *ptep = pteval;
 122 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 123         if (pte_val(pteval) & _PAGE_GLOBAL) {
 124                 pte_t *buddy = ptep_buddy(ptep);
 125                 /*
 126                  * Make sure the buddy is global too (if it's !none,
 127                  * it better already be global)
 128                  */
 129                 if (pte_none(*buddy))
 130                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 131         }
 132 #endif
 133 }
 134 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 135
 136 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 137 {
 138 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 139         /* Preserve global status for the pair */
 140         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 141                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 142         else
 143 #endif
 144                 set_pte_at(mm, addr, ptep, __pte(0));
 145 }
 146 #endif
 147
 148 /*
 149  * (pmds are folded into puds so this doesn't get actually called,
 150  * but the define is needed for a generic inline function.)
 151  */
 152 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 153
 154 #ifdef CONFIG_64BIT
 155 /*
 156  * (puds are folded into pgds so this doesn't get actually called,
 157  * but the define is needed for a generic inline function.)
 158  */
 159 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 160 #endif
 161
 162 #define PGD_T_LOG2      ffz(~sizeof(pgd_t))
 163 #define PMD_T_LOG2      ffz(~sizeof(pmd_t))
 164 #define PTE_T_LOG2      ffz(~sizeof(pte_t))
 165
 166 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 167
 168 /*
 169  * The following only work if pte_present() is true.
 170  * Undefined behaviour if not..
 171  */
 172 static inline int pte_user(pte_t pte)   { BUG(); return 0; }
 173 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 174 static inline int pte_read(pte_t pte)   { return (pte).pte_low & _PAGE_READ; }
 175 static inline int pte_write(pte_t pte)  { return (pte).pte_low & _PAGE_WRITE; }
 176 static inline int pte_dirty(pte_t pte)  { return (pte).pte_low & _PAGE_MODIFIED; }
 177 static inline int pte_young(pte_t pte)  { return (pte).pte_low & _PAGE_ACCESSED; }
 178 static inline int pte_file(pte_t pte)   { return (pte).pte_low & _PAGE_FILE; }
 179 static inline pte_t pte_wrprotect(pte_t pte)
 180 {
 181         (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 182         (pte).pte_high &= ~_PAGE_SILENT_WRITE;
 183         return pte;
 184 }
 185
 186 static inline pte_t pte_rdprotect(pte_t pte)
 187 {
 188         (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 189         (pte).pte_high &= ~_PAGE_SILENT_READ;
 190         return pte;
 191 }
 192
 193 static inline pte_t pte_mkclean(pte_t pte)
 194 {
 195         (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 196         (pte).pte_high &= ~_PAGE_SILENT_WRITE;
 197         return pte;
 198 }
 199
 200 static inline pte_t pte_mkold(pte_t pte)
 201 {
 202         (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 203         (pte).pte_high &= ~_PAGE_SILENT_READ;
 204         return pte;
 205 }
 206
 207 static inline pte_t pte_mkwrite(pte_t pte)
 208 {
 209         (pte).pte_low |= _PAGE_WRITE;
 210         if ((pte).pte_low & _PAGE_MODIFIED) {
 211                 (pte).pte_low |= _PAGE_SILENT_WRITE;
 212                 (pte).pte_high |= _PAGE_SILENT_WRITE;
 213         }
 214         return pte;
 215 }
 216
 217 static inline pte_t pte_mkread(pte_t pte)
 218 {
 219         (pte).pte_low |= _PAGE_READ;
 220         if ((pte).pte_low & _PAGE_ACCESSED) {
 221                 (pte).pte_low |= _PAGE_SILENT_READ;
 222                 (pte).pte_high |= _PAGE_SILENT_READ;
 223         }
 224         return pte;
 225 }
 226
 227 static inline pte_t pte_mkdirty(pte_t pte)
 228 {
 229         (pte).pte_low |= _PAGE_MODIFIED;
 230         if ((pte).pte_low & _PAGE_WRITE) {
 231                 (pte).pte_low |= _PAGE_SILENT_WRITE;
 232                 (pte).pte_high |= _PAGE_SILENT_WRITE;
 233         }
 234         return pte;
 235 }
 236
 237 static inline pte_t pte_mkyoung(pte_t pte)
 238 {
 239         (pte).pte_low |= _PAGE_ACCESSED;
 240         if ((pte).pte_low & _PAGE_READ)
 241                 (pte).pte_low |= _PAGE_SILENT_READ;
 242                 (pte).pte_high |= _PAGE_SILENT_READ;
 243         return pte;
 244 }
 245 #else
 246 static inline int pte_read(pte_t pte)   { return pte_val(pte) & _PAGE_READ; }
 247 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 248 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 249 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 250 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 251
 252 static inline pte_t pte_wrprotect(pte_t pte)
 253 {
 254         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 255         return pte;
 256 }
 257
 258 static inline pte_t pte_rdprotect(pte_t pte)
 259 {
 260         pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 261         return pte;
 262 }
 263
 264 static inline pte_t pte_mkclean(pte_t pte)
 265 {
 266         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 267         return pte;
 268 }
 269
 270 static inline pte_t pte_mkold(pte_t pte)
 271 {
 272         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 273         return pte;
 274 }
 275
 276 static inline pte_t pte_mkwrite(pte_t pte)
 277 {
 278         pte_val(pte) |= _PAGE_WRITE;
 279         if (pte_val(pte) & _PAGE_MODIFIED)
 280                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 281         return pte;
 282 }
 283
 284 static inline pte_t pte_mkread(pte_t pte)
 285 {
 286         pte_val(pte) |= _PAGE_READ;
 287         if (pte_val(pte) & _PAGE_ACCESSED)
 288                 pte_val(pte) |= _PAGE_SILENT_READ;
 289         return pte;
 290 }
 291
 292 static inline pte_t pte_mkdirty(pte_t pte)
 293 {
 294         pte_val(pte) |= _PAGE_MODIFIED;
 295         if (pte_val(pte) & _PAGE_WRITE)
 296                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 297         return pte;
 298 }
 299
 300 static inline pte_t pte_mkyoung(pte_t pte)
 301 {
 302         pte_val(pte) |= _PAGE_ACCESSED;
 303         if (pte_val(pte) & _PAGE_READ)
 304                 pte_val(pte) |= _PAGE_SILENT_READ;
 305         return pte;
 306 }
 307 #endif
 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_R1)
 333 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 334 {
 335         pte.pte_low &= _PAGE_CHG_MASK;
 336         pte.pte_low |= pgprot_val(newprot);
 337         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 338         return pte;
 339 }
 340 #else
 341 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 342 {
 343         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 344 }
 345 #endif
 346
 347
 348 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 349         pte_t pte);
 350 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 351         pte_t pte);
 352
 353 static inline void update_mmu_cache(struct vm_area_struct *vma,
 354         unsigned long address, pte_t pte)
 355 {
 356         __update_tlb(vma, address, pte);
 357         __update_cache(vma, address, pte);
 358 }
 359
 360 #ifndef CONFIG_NEED_MULTIPLE_NODES
 361 #define kern_addr_valid(addr)   (1)
 362 #endif
 363
 364 #ifdef CONFIG_64BIT_PHYS_ADDR
 365 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 366
 367 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 368                 unsigned long vaddr,
 369                 unsigned long pfn,
 370                 unsigned long size,
 371                 pgprot_t prot)
 372 {
 373         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 374         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 375 }
 376 #else
 377 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 378                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 379 #endif
 380
 381 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 382 #define GET_IOSPACE(pfn)                0
 383 #define GET_PFN(pfn)                    (pfn)
 384
 385 #include <asm-generic/pgtable.h>
 386
 387 /*
 388  * We provide our own get_unmapped area to cope with the virtual aliasing
 389  * constraints placed on us by the cache architecture.
 390  */
 391 #define HAVE_ARCH_UNMAPPED_AREA
 392
 393 /*
 394  * No page table caches to initialise
 395  */
 396 #define pgtable_cache_init()    do { } while (0)
 397
 398 #endif /* _ASM_PGTABLE_H */