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 #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 #define __P000  PAGE_NONE
  44 #define __P001  PAGE_READONLY
  45 #define __P010  PAGE_COPY
  46 #define __P011  PAGE_COPY
  47 #define __P100  PAGE_READONLY
  48 #define __P101  PAGE_READONLY
  49 #define __P110  PAGE_COPY
  50 #define __P111  PAGE_COPY
  51
  52 #define __S000  PAGE_NONE
  53 #define __S001  PAGE_READONLY
  54 #define __S010  PAGE_SHARED
  55 #define __S011  PAGE_SHARED
  56 #define __S100  PAGE_READONLY
  57 #define __S101  PAGE_READONLY
  58 #define __S110  PAGE_SHARED
  59 #define __S111  PAGE_SHARED
  60
  61 /*
  62  * ZERO_PAGE is a global shared page that is always zero; used
  63  * for zero-mapped memory areas etc..
  64  */
  65
  66 extern unsigned long empty_zero_page;
  67 extern unsigned long zero_page_mask;
  68
  69 #define ZERO_PAGE(vaddr) \
  70         (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  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_vaddr(pmd)     pmd_val(pmd)
  81
  82 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
  83
  84 #define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
  85 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
  86
  87 static inline void set_pte(pte_t *ptep, pte_t pte)
  88 {
  89         ptep->pte_high = pte.pte_high;
  90         smp_wmb();
  91         ptep->pte_low = pte.pte_low;
  92         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
  93
  94         if (pte.pte_low & _PAGE_GLOBAL) {
  95                 pte_t *buddy = ptep_buddy(ptep);
  96                 /*
  97                  * Make sure the buddy is global too (if it's !none,
  98                  * it better already be global)
  99                  */
 100                 if (pte_none(*buddy)) {
 101                         buddy->pte_low  |= _PAGE_GLOBAL;
 102                         buddy->pte_high |= _PAGE_GLOBAL;
 103                 }
 104         }
 105 }
 106 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 107
 108 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 109 {
 110         pte_t null = __pte(0);
 111
 112         /* Preserve global status for the pair */
 113         if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 114                 null.pte_low = null.pte_high = _PAGE_GLOBAL;
 115
 116         set_pte_at(mm, addr, ptep, null);
 117 }
 118 #else
 119
 120 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 121 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 122
 123 /*
 124  * Certain architectures need to do special things when pte's
 125  * within a page table are directly modified.  Thus, the following
 126  * hook is made available.
 127  */
 128 static inline void set_pte(pte_t *ptep, pte_t pteval)
 129 {
 130         *ptep = pteval;
 131 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 132         if (pte_val(pteval) & _PAGE_GLOBAL) {
 133                 pte_t *buddy = ptep_buddy(ptep);
 134                 /*
 135                  * Make sure the buddy is global too (if it's !none,
 136                  * it better already be global)
 137                  */
 138                 if (pte_none(*buddy))
 139                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 140         }
 141 #endif
 142 }
 143 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 144
 145 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 146 {
 147 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 148         /* Preserve global status for the pair */
 149         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 150                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 151         else
 152 #endif
 153                 set_pte_at(mm, addr, ptep, __pte(0));
 154 }
 155 #endif
 156
 157 /*
 158  * (pmds are folded into puds so this doesn't get actually called,
 159  * but the define is needed for a generic inline function.)
 160  */
 161 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 162
 163 #ifdef CONFIG_64BIT
 164 /*
 165  * (puds are folded into pgds so this doesn't get actually called,
 166  * but the define is needed for a generic inline function.)
 167  */
 168 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 169 #endif
 170
 171 #define PGD_T_LOG2      ffz(~sizeof(pgd_t))
 172 #define PMD_T_LOG2      ffz(~sizeof(pmd_t))
 173 #define PTE_T_LOG2      ffz(~sizeof(pte_t))
 174
 175 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 176
 177 /*
 178  * The following only work if pte_present() is true.
 179  * Undefined behaviour if not..
 180  */
 181 static inline int pte_user(pte_t pte)   { BUG(); return 0; }
 182 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 183 static inline int pte_read(pte_t pte)   { return pte.pte_low & _PAGE_READ; }
 184 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 185 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 186 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 187 static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 188
 189 static inline pte_t pte_wrprotect(pte_t pte)
 190 {
 191         pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 192         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 193         return pte;
 194 }
 195
 196 static inline pte_t pte_rdprotect(pte_t pte)
 197 {
 198         pte.pte_low  &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 199         pte.pte_high &= ~_PAGE_SILENT_READ;
 200         return pte;
 201 }
 202
 203 static inline pte_t pte_mkclean(pte_t pte)
 204 {
 205         pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 206         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 207         return pte;
 208 }
 209
 210 static inline pte_t pte_mkold(pte_t pte)
 211 {
 212         pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 213         pte.pte_high &= ~_PAGE_SILENT_READ;
 214         return pte;
 215 }
 216
 217 static inline pte_t pte_mkwrite(pte_t pte)
 218 {
 219         pte.pte_low |= _PAGE_WRITE;
 220         if (pte.pte_low & _PAGE_MODIFIED) {
 221                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 222                 pte.pte_high |= _PAGE_SILENT_WRITE;
 223         }
 224         return pte;
 225 }
 226
 227 static inline pte_t pte_mkread(pte_t pte)
 228 {
 229         pte.pte_low |= _PAGE_READ;
 230         if (pte.pte_low & _PAGE_ACCESSED) {
 231                 pte.pte_low  |= _PAGE_SILENT_READ;
 232                 pte.pte_high |= _PAGE_SILENT_READ;
 233         }
 234         return pte;
 235 }
 236
 237 static inline pte_t pte_mkdirty(pte_t pte)
 238 {
 239         pte.pte_low |= _PAGE_MODIFIED;
 240         if (pte.pte_low & _PAGE_WRITE) {
 241                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 242                 pte.pte_high |= _PAGE_SILENT_WRITE;
 243         }
 244         return pte;
 245 }
 246
 247 static inline pte_t pte_mkyoung(pte_t pte)
 248 {
 249         pte.pte_low |= _PAGE_ACCESSED;
 250         if (pte.pte_low & _PAGE_READ)
 251                 pte.pte_low  |= _PAGE_SILENT_READ;
 252                 pte.pte_high |= _PAGE_SILENT_READ;
 253         return pte;
 254 }
 255 #else
 256 static inline int pte_read(pte_t pte)   { return pte_val(pte) & _PAGE_READ; }
 257 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 258 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 259 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 260 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 261
 262 static inline pte_t pte_wrprotect(pte_t pte)
 263 {
 264         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 265         return pte;
 266 }
 267
 268 static inline pte_t pte_rdprotect(pte_t pte)
 269 {
 270         pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 271         return pte;
 272 }
 273
 274 static inline pte_t pte_mkclean(pte_t pte)
 275 {
 276         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 277         return pte;
 278 }
 279
 280 static inline pte_t pte_mkold(pte_t pte)
 281 {
 282         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 283         return pte;
 284 }
 285
 286 static inline pte_t pte_mkwrite(pte_t pte)
 287 {
 288         pte_val(pte) |= _PAGE_WRITE;
 289         if (pte_val(pte) & _PAGE_MODIFIED)
 290                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 291         return pte;
 292 }
 293
 294 static inline pte_t pte_mkread(pte_t pte)
 295 {
 296         pte_val(pte) |= _PAGE_READ;
 297         if (pte_val(pte) & _PAGE_ACCESSED)
 298                 pte_val(pte) |= _PAGE_SILENT_READ;
 299         return pte;
 300 }
 301
 302 static inline pte_t pte_mkdirty(pte_t pte)
 303 {
 304         pte_val(pte) |= _PAGE_MODIFIED;
 305         if (pte_val(pte) & _PAGE_WRITE)
 306                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 307         return pte;
 308 }
 309
 310 static inline pte_t pte_mkyoung(pte_t pte)
 311 {
 312         pte_val(pte) |= _PAGE_ACCESSED;
 313         if (pte_val(pte) & _PAGE_READ)
 314                 pte_val(pte) |= _PAGE_SILENT_READ;
 315         return pte;
 316 }
 317 #endif
 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_R1)
 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 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 391 #define GET_IOSPACE(pfn)                0
 392 #define GET_PFN(pfn)                    (pfn)
 393
 394 #include <asm-generic/pgtable.h>
 395
 396 /*
 397  * We provide our own get_unmapped area to cope with the virtual aliasing
 398  * constraints placed on us by the cache architecture.
 399  */
 400 #define HAVE_ARCH_UNMAPPED_AREA
 401
 402 /*
 403  * No page table caches to initialise
 404  */
 405 #define pgtable_cache_init()    do { } while (0)
 406
 407 #endif /* _ASM_PGTABLE_H */