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 <linux/config.h>
  12 #ifdef CONFIG_32BIT
  13 #include <asm/pgtable-32.h>
  14 #endif
  15 #ifdef CONFIG_64BIT
  16 #include <asm/pgtable-64.h>
  17 #endif
  18
  19 #include <asm/io.h>
  20 #include <asm/pgtable-bits.h>
  21
  22 struct mm_struct;
  23 struct vm_area_struct;
  24
  25 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
  26 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  27                         PAGE_CACHABLE_DEFAULT)
  28 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | \
  29                         PAGE_CACHABLE_DEFAULT)
  30 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | \
  31                         PAGE_CACHABLE_DEFAULT)
  32 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  33                         _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
  34 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  35                         PAGE_CACHABLE_DEFAULT)
  36 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
  37                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
  38
  39 /*
  40  * MIPS can't do page protection for execute, and considers that the same like
  41  * read. Also, write permissions imply read permissions. This is the closest
  42  * we can get by reasonable means..
  43  */
  44 #define __P000  PAGE_NONE
  45 #define __P001  PAGE_READONLY
  46 #define __P010  PAGE_COPY
  47 #define __P011  PAGE_COPY
  48 #define __P100  PAGE_READONLY
  49 #define __P101  PAGE_READONLY
  50 #define __P110  PAGE_COPY
  51 #define __P111  PAGE_COPY
  52
  53 #define __S000  PAGE_NONE
  54 #define __S001  PAGE_READONLY
  55 #define __S010  PAGE_SHARED
  56 #define __S011  PAGE_SHARED
  57 #define __S100  PAGE_READONLY
  58 #define __S101  PAGE_READONLY
  59 #define __S110  PAGE_SHARED
  60 #define __S111  PAGE_SHARED
  61
  62 /*
  63  * ZERO_PAGE is a global shared page that is always zero; used
  64  * for zero-mapped memory areas etc..
  65  */
  66
  67 extern unsigned long empty_zero_page;
  68 extern unsigned long zero_page_mask;
  69
  70 #define ZERO_PAGE(vaddr) \
  71         (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
  72
  73 #define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
  74
  75 extern void paging_init(void);
  76
  77 /*
  78  * Conversion functions: convert a page and protection to a page entry,
  79  * and a page entry and page directory to the page they refer to.
  80  */
  81 #define pmd_phys(pmd)           (pmd_val(pmd) - PAGE_OFFSET)
  82 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  83 #define pmd_page_kernel(pmd)    pmd_val(pmd)
  84
  85 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
  86 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
  87
  88 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
  89 static inline void set_pte(pte_t *ptep, pte_t pte)
  90 {
  91         ptep->pte_high = pte.pte_high;
  92         smp_wmb();
  93         ptep->pte_low = pte.pte_low;
  94         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
  95
  96         if (pte_val(pte) & _PAGE_GLOBAL) {
  97                 pte_t *buddy = ptep_buddy(ptep);
  98                 /*
  99                  * Make sure the buddy is global too (if it's !none,
 100                  * it better already be global)
 101                  */
 102                 if (pte_none(*buddy))
 103                         buddy->pte_low |= _PAGE_GLOBAL;
 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         /* Preserve global status for the pair */
 111         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 112                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 113         else
 114                 set_pte_at(mm, addr, ptep, __pte(0));
 115 }
 116 #else
 117 /*
 118  * Certain architectures need to do special things when pte's
 119  * within a page table are directly modified.  Thus, the following
 120  * hook is made available.
 121  */
 122 static inline void set_pte(pte_t *ptep, pte_t pteval)
 123 {
 124         *ptep = pteval;
 125 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 126         if (pte_val(pteval) & _PAGE_GLOBAL) {
 127                 pte_t *buddy = ptep_buddy(ptep);
 128                 /*
 129                  * Make sure the buddy is global too (if it's !none,
 130                  * it better already be global)
 131                  */
 132                 if (pte_none(*buddy))
 133                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 134         }
 135 #endif
 136 }
 137 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 138
 139 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 140 {
 141 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 142         /* Preserve global status for the pair */
 143         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 144                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 145         else
 146 #endif
 147                 set_pte_at(mm, addr, ptep, __pte(0));
 148 }
 149 #endif
 150
 151 /*
 152  * (pmds are folded into puds so this doesn't get actually called,
 153  * but the define is needed for a generic inline function.)
 154  */
 155 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 156
 157 #ifdef CONFIG_64BIT
 158 /*
 159  * (puds are folded into pgds so this doesn't get actually called,
 160  * but the define is needed for a generic inline function.)
 161  */
 162 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 163 #endif
 164
 165 #define PGD_T_LOG2      ffz(~sizeof(pgd_t))
 166 #define PMD_T_LOG2      ffz(~sizeof(pmd_t))
 167 #define PTE_T_LOG2      ffz(~sizeof(pte_t))
 168
 169 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 170
 171 /*
 172  * The following only work if pte_present() is true.
 173  * Undefined behaviour if not..
 174  */
 175 static inline int pte_user(pte_t pte)   { BUG(); return 0; }
 176 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 177 static inline int pte_read(pte_t pte)   { return (pte).pte_low & _PAGE_READ; }
 178 static inline int pte_write(pte_t pte)  { return (pte).pte_low & _PAGE_WRITE; }
 179 static inline int pte_dirty(pte_t pte)  { return (pte).pte_low & _PAGE_MODIFIED; }
 180 static inline int pte_young(pte_t pte)  { return (pte).pte_low & _PAGE_ACCESSED; }
 181 static inline int pte_file(pte_t pte)   { return (pte).pte_low & _PAGE_FILE; }
 182 static inline pte_t pte_wrprotect(pte_t pte)
 183 {
 184         (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 185         (pte).pte_high &= ~_PAGE_SILENT_WRITE;
 186         return pte;
 187 }
 188
 189 static inline pte_t pte_rdprotect(pte_t pte)
 190 {
 191         (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 192         (pte).pte_high &= ~_PAGE_SILENT_READ;
 193         return pte;
 194 }
 195
 196 static inline pte_t pte_mkclean(pte_t pte)
 197 {
 198         (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 199         (pte).pte_high &= ~_PAGE_SILENT_WRITE;
 200         return pte;
 201 }
 202
 203 static inline pte_t pte_mkold(pte_t pte)
 204 {
 205         (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 206         (pte).pte_high &= ~_PAGE_SILENT_READ;
 207         return pte;
 208 }
 209
 210 static inline pte_t pte_mkwrite(pte_t pte)
 211 {
 212         (pte).pte_low |= _PAGE_WRITE;
 213         if ((pte).pte_low & _PAGE_MODIFIED) {
 214                 (pte).pte_low |= _PAGE_SILENT_WRITE;
 215                 (pte).pte_high |= _PAGE_SILENT_WRITE;
 216         }
 217         return pte;
 218 }
 219
 220 static inline pte_t pte_mkread(pte_t pte)
 221 {
 222         (pte).pte_low |= _PAGE_READ;
 223         if ((pte).pte_low & _PAGE_ACCESSED) {
 224                 (pte).pte_low |= _PAGE_SILENT_READ;
 225                 (pte).pte_high |= _PAGE_SILENT_READ;
 226         }
 227         return pte;
 228 }
 229
 230 static inline pte_t pte_mkdirty(pte_t pte)
 231 {
 232         (pte).pte_low |= _PAGE_MODIFIED;
 233         if ((pte).pte_low & _PAGE_WRITE) {
 234                 (pte).pte_low |= _PAGE_SILENT_WRITE;
 235                 (pte).pte_high |= _PAGE_SILENT_WRITE;
 236         }
 237         return pte;
 238 }
 239
 240 static inline pte_t pte_mkyoung(pte_t pte)
 241 {
 242         (pte).pte_low |= _PAGE_ACCESSED;
 243         if ((pte).pte_low & _PAGE_READ)
 244                 (pte).pte_low |= _PAGE_SILENT_READ;
 245                 (pte).pte_high |= _PAGE_SILENT_READ;
 246         return pte;
 247 }
 248 #else
 249 static inline int pte_read(pte_t pte)   { return pte_val(pte) & _PAGE_READ; }
 250 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 251 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 252 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 253 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 254
 255 static inline pte_t pte_wrprotect(pte_t pte)
 256 {
 257         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 258         return pte;
 259 }
 260
 261 static inline pte_t pte_rdprotect(pte_t pte)
 262 {
 263         pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 264         return pte;
 265 }
 266
 267 static inline pte_t pte_mkclean(pte_t pte)
 268 {
 269         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 270         return pte;
 271 }
 272
 273 static inline pte_t pte_mkold(pte_t pte)
 274 {
 275         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 276         return pte;
 277 }
 278
 279 static inline pte_t pte_mkwrite(pte_t pte)
 280 {
 281         pte_val(pte) |= _PAGE_WRITE;
 282         if (pte_val(pte) & _PAGE_MODIFIED)
 283                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 284         return pte;
 285 }
 286
 287 static inline pte_t pte_mkread(pte_t pte)
 288 {
 289         pte_val(pte) |= _PAGE_READ;
 290         if (pte_val(pte) & _PAGE_ACCESSED)
 291                 pte_val(pte) |= _PAGE_SILENT_READ;
 292         return pte;
 293 }
 294
 295 static inline pte_t pte_mkdirty(pte_t pte)
 296 {
 297         pte_val(pte) |= _PAGE_MODIFIED;
 298         if (pte_val(pte) & _PAGE_WRITE)
 299                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 300         return pte;
 301 }
 302
 303 static inline pte_t pte_mkyoung(pte_t pte)
 304 {
 305         pte_val(pte) |= _PAGE_ACCESSED;
 306         if (pte_val(pte) & _PAGE_READ)
 307                 pte_val(pte) |= _PAGE_SILENT_READ;
 308         return pte;
 309 }
 310 #endif
 311
 312 /*
 313  * Macro to make mark a page protection value as "uncacheable".  Note
 314  * that "protection" is really a misnomer here as the protection value
 315  * contains the memory attribute bits, dirty bits, and various other
 316  * bits as well.
 317  */
 318 #define pgprot_noncached pgprot_noncached
 319
 320 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 321 {
 322         unsigned long prot = pgprot_val(_prot);
 323
 324         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 325
 326         return __pgprot(prot);
 327 }
 328
 329 /*
 330  * Conversion functions: convert a page and protection to a page entry,
 331  * and a page entry and page directory to the page they refer to.
 332  */
 333 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 334
 335 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 336 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 337 {
 338         pte.pte_low &= _PAGE_CHG_MASK;
 339         pte.pte_low |= pgprot_val(newprot);
 340         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 341         return pte;
 342 }
 343 #else
 344 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 345 {
 346         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 347 }
 348 #endif
 349
 350
 351 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 352         pte_t pte);
 353 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 354         pte_t pte);
 355
 356 static inline void update_mmu_cache(struct vm_area_struct *vma,
 357         unsigned long address, pte_t pte)
 358 {
 359         __update_tlb(vma, address, pte);
 360         __update_cache(vma, address, pte);
 361 }
 362
 363 #ifndef CONFIG_NEED_MULTIPLE_NODES
 364 #define kern_addr_valid(addr)   (1)
 365 #endif
 366
 367 #ifdef CONFIG_64BIT_PHYS_ADDR
 368 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 369
 370 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 371                 unsigned long vaddr,
 372                 unsigned long pfn,
 373                 unsigned long size,
 374                 pgprot_t prot)
 375 {
 376         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 377         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 378 }
 379 #else
 380 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 381                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 382 #endif
 383
 384 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 385 #define GET_IOSPACE(pfn)                0
 386 #define GET_PFN(pfn)                    (pfn)
 387
 388 #include <asm-generic/pgtable.h>
 389
 390 /*
 391  * We provide our own get_unmapped area to cope with the virtual aliasing
 392  * constraints placed on us by the cache architecture.
 393  */
 394 #define HAVE_ARCH_UNMAPPED_AREA
 395
 396 /*
 397  * No page table caches to initialise
 398  */
 399 #define pgtable_cache_init()    do { } while (0)
 400
 401 #endif /* _ASM_PGTABLE_H */