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(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
  71
  72 #define __HAVE_ARCH_MOVE_PTE
  73 #define move_pte(pte, prot, old_addr, new_addr)                         \
  74 ({                                                                      \
  75         pte_t newpte = (pte);                                           \
  76         if (pte_present(pte) && pfn_valid(pte_pfn(pte)) &&              \
  77                         pte_page(pte) == ZERO_PAGE(old_addr))           \
  78                 newpte = mk_pte(ZERO_PAGE(new_addr), (prot));           \
  79         newpte;                                                         \
  80 })
  81
  82 extern void paging_init(void);
  83
  84 /*
  85  * Conversion functions: convert a page and protection to a page entry,
  86  * and a page entry and page directory to the page they refer to.
  87  */
  88 #define pmd_phys(pmd)           (pmd_val(pmd) - PAGE_OFFSET)
  89 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  90 #define pmd_page_kernel(pmd)    pmd_val(pmd)
  91
  92 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
  93
  94 #define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
  95 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
  96
  97 static inline void set_pte(pte_t *ptep, pte_t pte)
  98 {
  99         ptep->pte_high = pte.pte_high;
 100         smp_wmb();
 101         ptep->pte_low = pte.pte_low;
 102         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
 103
 104         if (pte.pte_low & _PAGE_GLOBAL) {
 105                 pte_t *buddy = ptep_buddy(ptep);
 106                 /*
 107                  * Make sure the buddy is global too (if it's !none,
 108                  * it better already be global)
 109                  */
 110                 if (pte_none(*buddy)) {
 111                         buddy->pte_low  |= _PAGE_GLOBAL;
 112                         buddy->pte_high |= _PAGE_GLOBAL;
 113                 }
 114         }
 115 }
 116 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 117
 118 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 119 {
 120         pte_t null = __pte(0);
 121
 122         /* Preserve global status for the pair */
 123         if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 124                 null.pte_low = null.pte_high = _PAGE_GLOBAL;
 125
 126         set_pte_at(mm, addr, ptep, null);
 127 }
 128 #else
 129
 130 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 131 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 132
 133 /*
 134  * Certain architectures need to do special things when pte's
 135  * within a page table are directly modified.  Thus, the following
 136  * hook is made available.
 137  */
 138 static inline void set_pte(pte_t *ptep, pte_t pteval)
 139 {
 140         *ptep = pteval;
 141 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 142         if (pte_val(pteval) & _PAGE_GLOBAL) {
 143                 pte_t *buddy = ptep_buddy(ptep);
 144                 /*
 145                  * Make sure the buddy is global too (if it's !none,
 146                  * it better already be global)
 147                  */
 148                 if (pte_none(*buddy))
 149                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 150         }
 151 #endif
 152 }
 153 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 154
 155 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 156 {
 157 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 158         /* Preserve global status for the pair */
 159         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 160                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 161         else
 162 #endif
 163                 set_pte_at(mm, addr, ptep, __pte(0));
 164 }
 165 #endif
 166
 167 /*
 168  * (pmds are folded into puds so this doesn't get actually called,
 169  * but the define is needed for a generic inline function.)
 170  */
 171 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 172
 173 #ifdef CONFIG_64BIT
 174 /*
 175  * (puds are folded into pgds so this doesn't get actually called,
 176  * but the define is needed for a generic inline function.)
 177  */
 178 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 179 #endif
 180
 181 #define PGD_T_LOG2      ffz(~sizeof(pgd_t))
 182 #define PMD_T_LOG2      ffz(~sizeof(pmd_t))
 183 #define PTE_T_LOG2      ffz(~sizeof(pte_t))
 184
 185 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 186
 187 /*
 188  * The following only work if pte_present() is true.
 189  * Undefined behaviour if not..
 190  */
 191 static inline int pte_user(pte_t pte)   { BUG(); return 0; }
 192 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 193 static inline int pte_read(pte_t pte)   { return pte.pte_low & _PAGE_READ; }
 194 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 195 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 196 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 197 static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 198
 199 static inline pte_t pte_wrprotect(pte_t pte)
 200 {
 201         pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 202         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 203         return pte;
 204 }
 205
 206 static inline pte_t pte_rdprotect(pte_t pte)
 207 {
 208         pte.pte_low  &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 209         pte.pte_high &= ~_PAGE_SILENT_READ;
 210         return pte;
 211 }
 212
 213 static inline pte_t pte_mkclean(pte_t pte)
 214 {
 215         pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 216         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 217         return pte;
 218 }
 219
 220 static inline pte_t pte_mkold(pte_t pte)
 221 {
 222         pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 223         pte.pte_high &= ~_PAGE_SILENT_READ;
 224         return pte;
 225 }
 226
 227 static inline pte_t pte_mkwrite(pte_t pte)
 228 {
 229         pte.pte_low |= _PAGE_WRITE;
 230         if (pte.pte_low & _PAGE_MODIFIED) {
 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_mkread(pte_t pte)
 238 {
 239         pte.pte_low |= _PAGE_READ;
 240         if (pte.pte_low & _PAGE_ACCESSED) {
 241                 pte.pte_low  |= _PAGE_SILENT_READ;
 242                 pte.pte_high |= _PAGE_SILENT_READ;
 243         }
 244         return pte;
 245 }
 246
 247 static inline pte_t pte_mkdirty(pte_t pte)
 248 {
 249         pte.pte_low |= _PAGE_MODIFIED;
 250         if (pte.pte_low & _PAGE_WRITE) {
 251                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 252                 pte.pte_high |= _PAGE_SILENT_WRITE;
 253         }
 254         return pte;
 255 }
 256
 257 static inline pte_t pte_mkyoung(pte_t pte)
 258 {
 259         pte.pte_low |= _PAGE_ACCESSED;
 260         if (pte.pte_low & _PAGE_READ)
 261                 pte.pte_low  |= _PAGE_SILENT_READ;
 262                 pte.pte_high |= _PAGE_SILENT_READ;
 263         return pte;
 264 }
 265 #else
 266 static inline int pte_read(pte_t pte)   { return pte_val(pte) & _PAGE_READ; }
 267 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 268 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 269 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 270 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 271
 272 static inline pte_t pte_wrprotect(pte_t pte)
 273 {
 274         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 275         return pte;
 276 }
 277
 278 static inline pte_t pte_rdprotect(pte_t pte)
 279 {
 280         pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 281         return pte;
 282 }
 283
 284 static inline pte_t pte_mkclean(pte_t pte)
 285 {
 286         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 287         return pte;
 288 }
 289
 290 static inline pte_t pte_mkold(pte_t pte)
 291 {
 292         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 293         return pte;
 294 }
 295
 296 static inline pte_t pte_mkwrite(pte_t pte)
 297 {
 298         pte_val(pte) |= _PAGE_WRITE;
 299         if (pte_val(pte) & _PAGE_MODIFIED)
 300                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 301         return pte;
 302 }
 303
 304 static inline pte_t pte_mkread(pte_t pte)
 305 {
 306         pte_val(pte) |= _PAGE_READ;
 307         if (pte_val(pte) & _PAGE_ACCESSED)
 308                 pte_val(pte) |= _PAGE_SILENT_READ;
 309         return pte;
 310 }
 311
 312 static inline pte_t pte_mkdirty(pte_t pte)
 313 {
 314         pte_val(pte) |= _PAGE_MODIFIED;
 315         if (pte_val(pte) & _PAGE_WRITE)
 316                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 317         return pte;
 318 }
 319
 320 static inline pte_t pte_mkyoung(pte_t pte)
 321 {
 322         pte_val(pte) |= _PAGE_ACCESSED;
 323         if (pte_val(pte) & _PAGE_READ)
 324                 pte_val(pte) |= _PAGE_SILENT_READ;
 325         return pte;
 326 }
 327 #endif
 328
 329 /*
 330  * Macro to make mark a page protection value as "uncacheable".  Note
 331  * that "protection" is really a misnomer here as the protection value
 332  * contains the memory attribute bits, dirty bits, and various other
 333  * bits as well.
 334  */
 335 #define pgprot_noncached pgprot_noncached
 336
 337 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 338 {
 339         unsigned long prot = pgprot_val(_prot);
 340
 341         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 342
 343         return __pgprot(prot);
 344 }
 345
 346 /*
 347  * Conversion functions: convert a page and protection to a page entry,
 348  * and a page entry and page directory to the page they refer to.
 349  */
 350 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 351
 352 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 353 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 354 {
 355         pte.pte_low  &= _PAGE_CHG_MASK;
 356         pte.pte_high &= ~0x3f;
 357         pte.pte_low  |= pgprot_val(newprot);
 358         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 359         return pte;
 360 }
 361 #else
 362 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 363 {
 364         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 365 }
 366 #endif
 367
 368
 369 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 370         pte_t pte);
 371 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 372         pte_t pte);
 373
 374 static inline void update_mmu_cache(struct vm_area_struct *vma,
 375         unsigned long address, pte_t pte)
 376 {
 377         __update_tlb(vma, address, pte);
 378         __update_cache(vma, address, pte);
 379 }
 380
 381 #define kern_addr_valid(addr)   (1)
 382
 383 #ifdef CONFIG_64BIT_PHYS_ADDR
 384 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 385
 386 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 387                 unsigned long vaddr,
 388                 unsigned long pfn,
 389                 unsigned long size,
 390                 pgprot_t prot)
 391 {
 392         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 393         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 394 }
 395 #else
 396 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 397                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 398 #endif
 399
 400 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 401 #define GET_IOSPACE(pfn)                0
 402 #define GET_PFN(pfn)                    (pfn)
 403
 404 #include <asm-generic/pgtable.h>
 405
 406 /*
 407  * We provide our own get_unmapped area to cope with the virtual aliasing
 408  * constraints placed on us by the cache architecture.
 409  */
 410 #define HAVE_ARCH_UNMAPPED_AREA
 411
 412 /*
 413  * No page table caches to initialise
 414  */
 415 #define pgtable_cache_init()    do { } while (0)
 416
 417 #endif /* _ASM_PGTABLE_H */