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      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 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 182 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 183 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 184 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 185 static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 186
 187 static inline pte_t pte_wrprotect(pte_t pte)
 188 {
 189         pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 190         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 191         return pte;
 192 }
 193
 194 static inline pte_t pte_mkclean(pte_t pte)
 195 {
 196         pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 197         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 198         return pte;
 199 }
 200
 201 static inline pte_t pte_mkold(pte_t pte)
 202 {
 203         pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 204         pte.pte_high &= ~_PAGE_SILENT_READ;
 205         return pte;
 206 }
 207
 208 static inline pte_t pte_mkwrite(pte_t pte)
 209 {
 210         pte.pte_low |= _PAGE_WRITE;
 211         if (pte.pte_low & _PAGE_MODIFIED) {
 212                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 213                 pte.pte_high |= _PAGE_SILENT_WRITE;
 214         }
 215         return pte;
 216 }
 217
 218 static inline pte_t pte_mkdirty(pte_t pte)
 219 {
 220         pte.pte_low |= _PAGE_MODIFIED;
 221         if (pte.pte_low & _PAGE_WRITE) {
 222                 pte.pte_low  |= _PAGE_SILENT_WRITE;
 223                 pte.pte_high |= _PAGE_SILENT_WRITE;
 224         }
 225         return pte;
 226 }
 227
 228 static inline pte_t pte_mkyoung(pte_t pte)
 229 {
 230         pte.pte_low |= _PAGE_ACCESSED;
 231         if (pte.pte_low & _PAGE_READ)
 232                 pte.pte_low  |= _PAGE_SILENT_READ;
 233                 pte.pte_high |= _PAGE_SILENT_READ;
 234         return pte;
 235 }
 236 #else
 237 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 238 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 239 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 240 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 241
 242 static inline pte_t pte_wrprotect(pte_t pte)
 243 {
 244         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 245         return pte;
 246 }
 247
 248 static inline pte_t pte_mkclean(pte_t pte)
 249 {
 250         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 251         return pte;
 252 }
 253
 254 static inline pte_t pte_mkold(pte_t pte)
 255 {
 256         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 257         return pte;
 258 }
 259
 260 static inline pte_t pte_mkwrite(pte_t pte)
 261 {
 262         pte_val(pte) |= _PAGE_WRITE;
 263         if (pte_val(pte) & _PAGE_MODIFIED)
 264                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 265         return pte;
 266 }
 267
 268 static inline pte_t pte_mkdirty(pte_t pte)
 269 {
 270         pte_val(pte) |= _PAGE_MODIFIED;
 271         if (pte_val(pte) & _PAGE_WRITE)
 272                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 273         return pte;
 274 }
 275
 276 static inline pte_t pte_mkyoung(pte_t pte)
 277 {
 278         pte_val(pte) |= _PAGE_ACCESSED;
 279         if (pte_val(pte) & _PAGE_READ)
 280                 pte_val(pte) |= _PAGE_SILENT_READ;
 281         return pte;
 282 }
 283 #endif
 284
 285 /*
 286  * Macro to make mark a page protection value as "uncacheable".  Note
 287  * that "protection" is really a misnomer here as the protection value
 288  * contains the memory attribute bits, dirty bits, and various other
 289  * bits as well.
 290  */
 291 #define pgprot_noncached pgprot_noncached
 292
 293 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 294 {
 295         unsigned long prot = pgprot_val(_prot);
 296
 297         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 298
 299         return __pgprot(prot);
 300 }
 301
 302 /*
 303  * Conversion functions: convert a page and protection to a page entry,
 304  * and a page entry and page directory to the page they refer to.
 305  */
 306 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 307
 308 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 309 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 310 {
 311         pte.pte_low  &= _PAGE_CHG_MASK;
 312         pte.pte_high &= ~0x3f;
 313         pte.pte_low  |= pgprot_val(newprot);
 314         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 315         return pte;
 316 }
 317 #else
 318 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 319 {
 320         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 321 }
 322 #endif
 323
 324
 325 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 326         pte_t pte);
 327 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 328         pte_t pte);
 329
 330 static inline void update_mmu_cache(struct vm_area_struct *vma,
 331         unsigned long address, pte_t pte)
 332 {
 333         __update_tlb(vma, address, pte);
 334         __update_cache(vma, address, pte);
 335 }
 336
 337 #define kern_addr_valid(addr)   (1)
 338
 339 #ifdef CONFIG_64BIT_PHYS_ADDR
 340 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 341
 342 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 343                 unsigned long vaddr,
 344                 unsigned long pfn,
 345                 unsigned long size,
 346                 pgprot_t prot)
 347 {
 348         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 349         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 350 }
 351 #else
 352 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 353                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 354 #endif
 355
 356 #include <asm-generic/pgtable.h>
 357
 358 /*
 359  * We provide our own get_unmapped area to cope with the virtual aliasing
 360  * constraints placed on us by the cache architecture.
 361  */
 362 #define HAVE_ARCH_UNMAPPED_AREA
 363
 364 /*
 365  * No page table caches to initialise
 366  */
 367 #define pgtable_cache_init()    do { } while (0)
 368
 369 #endif /* _ASM_PGTABLE_H */