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 <asm-generic/4level-fixup.h>
  12
  13 #include <linux/config.h>
  14 #ifdef CONFIG_32BIT
  15 #include <asm/pgtable-32.h>
  16 #endif
  17 #ifdef CONFIG_64BIT
  18 #include <asm/pgtable-64.h>
  19 #endif
  20
  21 #include <asm/pgtable-bits.h>
  22
  23 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
  24 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  25                         PAGE_CACHABLE_DEFAULT)
  26 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | \
  27                         PAGE_CACHABLE_DEFAULT)
  28 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | \
  29                         PAGE_CACHABLE_DEFAULT)
  30 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  31                         _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
  32 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  33                         PAGE_CACHABLE_DEFAULT)
  34 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
  35                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
  36
  37 /*
  38  * MIPS can't do page protection for execute, and considers that the same like
  39  * read. Also, write permissions imply read permissions. This is the closest
  40  * we can get by reasonable means..
  41  */
  42 #define __P000  PAGE_NONE
  43 #define __P001  PAGE_READONLY
  44 #define __P010  PAGE_COPY
  45 #define __P011  PAGE_COPY
  46 #define __P100  PAGE_READONLY
  47 #define __P101  PAGE_READONLY
  48 #define __P110  PAGE_COPY
  49 #define __P111  PAGE_COPY
  50
  51 #define __S000  PAGE_NONE
  52 #define __S001  PAGE_READONLY
  53 #define __S010  PAGE_SHARED
  54 #define __S011  PAGE_SHARED
  55 #define __S100  PAGE_READONLY
  56 #define __S101  PAGE_READONLY
  57 #define __S110  PAGE_SHARED
  58 #define __S111  PAGE_SHARED
  59
  60 /*
  61  * ZERO_PAGE is a global shared page that is always zero; used
  62  * for zero-mapped memory areas etc..
  63  */
  64
  65 extern unsigned long empty_zero_page;
  66 extern unsigned long zero_page_mask;
  67
  68 #define ZERO_PAGE(vaddr) \
  69         (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
  70
  71 #define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
  72
  73 extern void paging_init(void);
  74
  75 /*
  76  * Conversion functions: convert a page and protection to a page entry,
  77  * and a page entry and page directory to the page they refer to.
  78  */
  79 #define page_pte(page)          page_pte_prot(page, __pgprot(0))
  80 #define pmd_phys(pmd)           (pmd_val(pmd) - PAGE_OFFSET)
  81 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  82 #define pmd_page_kernel(pmd)    pmd_val(pmd)
  83
  84 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
  85 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
  86
  87 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
  88 static inline void set_pte(pte_t *ptep, pte_t pte)
  89 {
  90         ptep->pte_high = pte.pte_high;
  91         smp_wmb();
  92         ptep->pte_low = pte.pte_low;
  93         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
  94
  95         if (pte_val(pte) & _PAGE_GLOBAL) {
  96                 pte_t *buddy = ptep_buddy(ptep);
  97                 /*
  98                  * Make sure the buddy is global too (if it's !none,
  99                  * it better already be global)
 100                  */
 101                 if (pte_none(*buddy))
 102                         buddy->pte_low |= _PAGE_GLOBAL;
 103         }
 104 }
 105 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 106
 107 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 108 {
 109         /* Preserve global status for the pair */
 110         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 111                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 112         else
 113                 set_pte_at(mm, addr, ptep, __pte(0));
 114 }
 115 #else
 116 /*
 117  * Certain architectures need to do special things when pte's
 118  * within a page table are directly modified.  Thus, the following
 119  * hook is made available.
 120  */
 121 static inline void set_pte(pte_t *ptep, pte_t pteval)
 122 {
 123         *ptep = pteval;
 124 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 125         if (pte_val(pteval) & _PAGE_GLOBAL) {
 126                 pte_t *buddy = ptep_buddy(ptep);
 127                 /*
 128                  * Make sure the buddy is global too (if it's !none,
 129                  * it better already be global)
 130                  */
 131                 if (pte_none(*buddy))
 132                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 133         }
 134 #endif
 135 }
 136 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 137
 138 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 139 {
 140 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 141         /* Preserve global status for the pair */
 142         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 143                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 144         else
 145 #endif
 146                 set_pte_at(mm, addr, ptep, __pte(0));
 147 }
 148 #endif
 149
 150 /*
 151  * (pmds are folded into pgds so this doesn't get actually called,
 152  * but the define is needed for a generic inline function.)
 153  */
 154 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 155 #define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
 156
 157 #define PGD_T_LOG2      ffz(~sizeof(pgd_t))
 158 #define PMD_T_LOG2      ffz(~sizeof(pmd_t))
 159 #define PTE_T_LOG2      ffz(~sizeof(pte_t))
 160
 161 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 162
 163 /*
 164  * The following only work if pte_present() is true.
 165  * Undefined behaviour if not..
 166  */
 167 static inline int pte_user(pte_t pte)   { BUG(); return 0; }
 168 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 169 static inline int pte_read(pte_t pte)   { return (pte).pte_low & _PAGE_READ; }
 170 static inline int pte_write(pte_t pte)  { return (pte).pte_low & _PAGE_WRITE; }
 171 static inline int pte_dirty(pte_t pte)  { return (pte).pte_low & _PAGE_MODIFIED; }
 172 static inline int pte_young(pte_t pte)  { return (pte).pte_low & _PAGE_ACCESSED; }
 173 static inline int pte_file(pte_t pte)   { return (pte).pte_low & _PAGE_FILE; }
 174 static inline pte_t pte_wrprotect(pte_t pte)
 175 {
 176         (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 177         (pte).pte_high &= ~_PAGE_SILENT_WRITE;
 178         return pte;
 179 }
 180
 181 static inline pte_t pte_rdprotect(pte_t pte)
 182 {
 183         (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 184         (pte).pte_high &= ~_PAGE_SILENT_READ;
 185         return pte;
 186 }
 187
 188 static inline pte_t pte_mkclean(pte_t pte)
 189 {
 190         (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 191         (pte).pte_high &= ~_PAGE_SILENT_WRITE;
 192         return pte;
 193 }
 194
 195 static inline pte_t pte_mkold(pte_t pte)
 196 {
 197         (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 198         (pte).pte_high &= ~_PAGE_SILENT_READ;
 199         return pte;
 200 }
 201
 202 static inline pte_t pte_mkwrite(pte_t pte)
 203 {
 204         (pte).pte_low |= _PAGE_WRITE;
 205         if ((pte).pte_low & _PAGE_MODIFIED) {
 206                 (pte).pte_low |= _PAGE_SILENT_WRITE;
 207                 (pte).pte_high |= _PAGE_SILENT_WRITE;
 208         }
 209         return pte;
 210 }
 211
 212 static inline pte_t pte_mkread(pte_t pte)
 213 {
 214         (pte).pte_low |= _PAGE_READ;
 215         if ((pte).pte_low & _PAGE_ACCESSED) {
 216                 (pte).pte_low |= _PAGE_SILENT_READ;
 217                 (pte).pte_high |= _PAGE_SILENT_READ;
 218         }
 219         return pte;
 220 }
 221
 222 static inline pte_t pte_mkdirty(pte_t pte)
 223 {
 224         (pte).pte_low |= _PAGE_MODIFIED;
 225         if ((pte).pte_low & _PAGE_WRITE) {
 226                 (pte).pte_low |= _PAGE_SILENT_WRITE;
 227                 (pte).pte_high |= _PAGE_SILENT_WRITE;
 228         }
 229         return pte;
 230 }
 231
 232 static inline pte_t pte_mkyoung(pte_t pte)
 233 {
 234         (pte).pte_low |= _PAGE_ACCESSED;
 235         if ((pte).pte_low & _PAGE_READ)
 236                 (pte).pte_low |= _PAGE_SILENT_READ;
 237                 (pte).pte_high |= _PAGE_SILENT_READ;
 238         return pte;
 239 }
 240 #else
 241 static inline int pte_read(pte_t pte)   { return pte_val(pte) & _PAGE_READ; }
 242 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 243 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 244 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 245 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 246
 247 static inline pte_t pte_wrprotect(pte_t pte)
 248 {
 249         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 250         return pte;
 251 }
 252
 253 static inline pte_t pte_rdprotect(pte_t pte)
 254 {
 255         pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 256         return pte;
 257 }
 258
 259 static inline pte_t pte_mkclean(pte_t pte)
 260 {
 261         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 262         return pte;
 263 }
 264
 265 static inline pte_t pte_mkold(pte_t pte)
 266 {
 267         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 268         return pte;
 269 }
 270
 271 static inline pte_t pte_mkwrite(pte_t pte)
 272 {
 273         pte_val(pte) |= _PAGE_WRITE;
 274         if (pte_val(pte) & _PAGE_MODIFIED)
 275                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 276         return pte;
 277 }
 278
 279 static inline pte_t pte_mkread(pte_t pte)
 280 {
 281         pte_val(pte) |= _PAGE_READ;
 282         if (pte_val(pte) & _PAGE_ACCESSED)
 283                 pte_val(pte) |= _PAGE_SILENT_READ;
 284         return pte;
 285 }
 286
 287 static inline pte_t pte_mkdirty(pte_t pte)
 288 {
 289         pte_val(pte) |= _PAGE_MODIFIED;
 290         if (pte_val(pte) & _PAGE_WRITE)
 291                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 292         return pte;
 293 }
 294
 295 static inline pte_t pte_mkyoung(pte_t pte)
 296 {
 297         pte_val(pte) |= _PAGE_ACCESSED;
 298         if (pte_val(pte) & _PAGE_READ)
 299                 pte_val(pte) |= _PAGE_SILENT_READ;
 300         return pte;
 301 }
 302 #endif
 303
 304 /*
 305  * Macro to make mark a page protection value as "uncacheable".  Note
 306  * that "protection" is really a misnomer here as the protection value
 307  * contains the memory attribute bits, dirty bits, and various other
 308  * bits as well.
 309  */
 310 #define pgprot_noncached pgprot_noncached
 311
 312 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 313 {
 314         unsigned long prot = pgprot_val(_prot);
 315
 316         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 317
 318         return __pgprot(prot);
 319 }
 320
 321 /*
 322  * Conversion functions: convert a page and protection to a page entry,
 323  * and a page entry and page directory to the page they refer to.
 324  */
 325 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 326
 327 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 328 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 329 {
 330         pte.pte_low &= _PAGE_CHG_MASK;
 331         pte.pte_low |= pgprot_val(newprot);
 332         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 333         return pte;
 334 }
 335 #else
 336 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 337 {
 338         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 339 }
 340 #endif
 341
 342
 343 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 344         pte_t pte);
 345 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 346         pte_t pte);
 347
 348 static inline void update_mmu_cache(struct vm_area_struct *vma,
 349         unsigned long address, pte_t pte)
 350 {
 351         __update_tlb(vma, address, pte);
 352         __update_cache(vma, address, pte);
 353 }
 354
 355 #ifndef CONFIG_NEED_MULTIPLE_NODES
 356 #define kern_addr_valid(addr)   (1)
 357 #endif
 358
 359 #ifdef CONFIG_64BIT_PHYS_ADDR
 360 extern phys_t fixup_bigphys_addr(phys_t phys_addr, phys_t size);
 361 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 362
 363 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 364                 unsigned long vaddr,
 365                 unsigned long pfn,
 366                 unsigned long size,
 367                 pgprot_t prot)
 368 {
 369         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 370         return remap_pfn_range(vma, vaddr, pfn, size, prot);
 371 }
 372 #else
 373 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 374                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 375 #endif
 376
 377 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 378 #define GET_IOSPACE(pfn)                0
 379 #define GET_PFN(pfn)                    (pfn)
 380
 381 #include <asm-generic/pgtable.h>
 382
 383 /*
 384  * We provide our own get_unmapped area to cope with the virtual aliasing
 385  * constraints placed on us by the cache architecture.
 386  */
 387 #define HAVE_ARCH_UNMAPPED_AREA
 388
 389 /*
 390  * No page table caches to initialise
 391  */
 392 #define pgtable_cache_init()    do { } while (0)
 393
 394 #endif /* _ASM_PGTABLE_H */