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)           virt_to_phys((void *)pmd_val(pmd))
  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      (__builtin_ffs(sizeof(pgd_t)) - 1)
 172 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 173 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 174
 175 /*
 176  * We used to declare this array with size but gcc 3.3 and older are not able
 177  * to find that this expression is a constant, so the size is dropped.
 178  */
 179 extern pgd_t swapper_pg_dir[];
 180
 181 /*
 182  * The following only work if pte_present() is true.
 183  * Undefined behaviour if not..
 184  */
 185 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 186 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 187 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 188 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 189 static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 190
 191 static inline pte_t pte_wrprotect(pte_t pte)
 192 {
 193         pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 194         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 195         return pte;
 196 }
 197
 198 static inline pte_t pte_mkclean(pte_t pte)
 199 {
 200         pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 201         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 202         return pte;
 203 }
 204
 205 static inline pte_t pte_mkold(pte_t pte)
 206 {
 207         pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 208         pte.pte_high &= ~_PAGE_SILENT_READ;
 209         return pte;
 210 }
 211
 212 static inline pte_t pte_mkwrite(pte_t pte)
 213 {
 214         pte.pte_low |= _PAGE_WRITE;
 215         if (pte.pte_low & _PAGE_MODIFIED) {
 216                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 217                 pte.pte_high |= _PAGE_SILENT_WRITE;
 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_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 242 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 243 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 244 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 245
 246 static inline pte_t pte_wrprotect(pte_t pte)
 247 {
 248         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 249         return pte;
 250 }
 251
 252 static inline pte_t pte_mkclean(pte_t pte)
 253 {
 254         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 255         return pte;
 256 }
 257
 258 static inline pte_t pte_mkold(pte_t pte)
 259 {
 260         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 261         return pte;
 262 }
 263
 264 static inline pte_t pte_mkwrite(pte_t pte)
 265 {
 266         pte_val(pte) |= _PAGE_WRITE;
 267         if (pte_val(pte) & _PAGE_MODIFIED)
 268                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 269         return pte;
 270 }
 271
 272 static inline pte_t pte_mkdirty(pte_t pte)
 273 {
 274         pte_val(pte) |= _PAGE_MODIFIED;
 275         if (pte_val(pte) & _PAGE_WRITE)
 276                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 277         return pte;
 278 }
 279
 280 static inline pte_t pte_mkyoung(pte_t pte)
 281 {
 282         pte_val(pte) |= _PAGE_ACCESSED;
 283         if (pte_val(pte) & _PAGE_READ)
 284                 pte_val(pte) |= _PAGE_SILENT_READ;
 285         return pte;
 286 }
 287 #endif
 288
 289 /*
 290  * Macro to make mark a page protection value as "uncacheable".  Note
 291  * that "protection" is really a misnomer here as the protection value
 292  * contains the memory attribute bits, dirty bits, and various other
 293  * bits as well.
 294  */
 295 #define pgprot_noncached pgprot_noncached
 296
 297 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 298 {
 299         unsigned long prot = pgprot_val(_prot);
 300
 301         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 302
 303         return __pgprot(prot);
 304 }
 305
 306 /*
 307  * Conversion functions: convert a page and protection to a page entry,
 308  * and a page entry and page directory to the page they refer to.
 309  */
 310 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 311
 312 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 313 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 314 {
 315         pte.pte_low  &= _PAGE_CHG_MASK;
 316         pte.pte_high &= ~0x3f;
 317         pte.pte_low  |= pgprot_val(newprot);
 318         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 319         return pte;
 320 }
 321 #else
 322 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 323 {
 324         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 325 }
 326 #endif
 327
 328
 329 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 330         pte_t pte);
 331 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 332         pte_t pte);
 333
 334 static inline void update_mmu_cache(struct vm_area_struct *vma,
 335         unsigned long address, pte_t pte)
 336 {
 337         __update_tlb(vma, address, pte);
 338         __update_cache(vma, address, pte);
 339 }
 340
 341 #define kern_addr_valid(addr)   (1)
 342
 343 #ifdef CONFIG_64BIT_PHYS_ADDR
 344 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 345
 346 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 347                 unsigned long vaddr,
 348                 unsigned long pfn,
 349                 unsigned long size,
 350                 pgprot_t prot)
 351 {
 352         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 353         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 354 }
 355 #else
 356 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 357                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 358 #endif
 359
 360 #include <asm-generic/pgtable.h>
 361
 362 /*
 363  * We provide our own get_unmapped area to cope with the virtual aliasing
 364  * constraints placed on us by the cache architecture.
 365  */
 366 #define HAVE_ARCH_UNMAPPED_AREA
 367
 368 /*
 369  * No page table caches to initialise
 370  */
 371 #define pgtable_cache_init()    do { } while (0)
 372
 373 #endif /* _ASM_PGTABLE_H */