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_MIPS32
  15 #include <asm/pgtable-32.h>
  16 #endif
  17 #ifdef CONFIG_MIPS64
  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 extern void paging_init(void);
  72
  73 /*
  74  * Conversion functions: convert a page and protection to a page entry,
  75  * and a page entry and page directory to the page they refer to.
  76  */
  77 #define page_pte(page)          page_pte_prot(page, __pgprot(0))
  78 #define pmd_phys(pmd)           (pmd_val(pmd) - PAGE_OFFSET)
  79 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  80 #define pmd_page_kernel(pmd)    pmd_val(pmd)
  81
  82 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
  83 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
  84
  85 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
  86 static inline void set_pte(pte_t *ptep, pte_t pte)
  87 {
  88         ptep->pte_high = pte.pte_high;
  89         smp_wmb();
  90         ptep->pte_low = pte.pte_low;
  91         //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
  92
  93         if (pte_val(pte) & _PAGE_GLOBAL) {
  94                 pte_t *buddy = ptep_buddy(ptep);
  95                 /*
  96                  * Make sure the buddy is global too (if it's !none,
  97                  * it better already be global)
  98                  */
  99                 if (pte_none(*buddy))
 100                         buddy->pte_low |= _PAGE_GLOBAL;
 101         }
 102 }
 103 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 104
 105 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 106 {
 107         /* Preserve global status for the pair */
 108         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 109                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 110         else
 111                 set_pte_at(mm, addr, ptep, __pte(0));
 112 }
 113 #else
 114 /*
 115  * Certain architectures need to do special things when pte's
 116  * within a page table are directly modified.  Thus, the following
 117  * hook is made available.
 118  */
 119 static inline void set_pte(pte_t *ptep, pte_t pteval)
 120 {
 121         *ptep = pteval;
 122 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 123         if (pte_val(pteval) & _PAGE_GLOBAL) {
 124                 pte_t *buddy = ptep_buddy(ptep);
 125                 /*
 126                  * Make sure the buddy is global too (if it's !none,
 127                  * it better already be global)
 128                  */
 129                 if (pte_none(*buddy))
 130                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 131         }
 132 #endif
 133 }
 134 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 135
 136 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 137 {
 138 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 139         /* Preserve global status for the pair */
 140         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 141                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 142         else
 143 #endif
 144                 set_pte_at(mm, addr, ptep, __pte(0));
 145 }
 146 #endif
 147
 148 /*
 149  * (pmds are folded into pgds so this doesn't get actually called,
 150  * but the define is needed for a generic inline function.)
 151  */
 152 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 153 #define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
 154
 155 #define PGD_T_LOG2      ffz(~sizeof(pgd_t))
 156 #define PMD_T_LOG2      ffz(~sizeof(pmd_t))
 157 #define PTE_T_LOG2      ffz(~sizeof(pte_t))
 158
 159 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 160
 161 /*
 162  * The following only work if pte_present() is true.
 163  * Undefined behaviour if not..
 164  */
 165 static inline int pte_user(pte_t pte)   { BUG(); return 0; }
 166 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 167 static inline int pte_read(pte_t pte)   { return (pte).pte_low & _PAGE_READ; }
 168 static inline int pte_write(pte_t pte)  { return (pte).pte_low & _PAGE_WRITE; }
 169 static inline int pte_dirty(pte_t pte)  { return (pte).pte_low & _PAGE_MODIFIED; }
 170 static inline int pte_young(pte_t pte)  { return (pte).pte_low & _PAGE_ACCESSED; }
 171 static inline int pte_file(pte_t pte)   { return (pte).pte_low & _PAGE_FILE; }
 172 static inline pte_t pte_wrprotect(pte_t pte)
 173 {
 174         (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 175         (pte).pte_high &= ~_PAGE_SILENT_WRITE;
 176         return pte;
 177 }
 178
 179 static inline pte_t pte_rdprotect(pte_t pte)
 180 {
 181         (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 182         (pte).pte_high &= ~_PAGE_SILENT_READ;
 183         return pte;
 184 }
 185
 186 static inline pte_t pte_mkclean(pte_t pte)
 187 {
 188         (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 189         (pte).pte_high &= ~_PAGE_SILENT_WRITE;
 190         return pte;
 191 }
 192
 193 static inline pte_t pte_mkold(pte_t pte)
 194 {
 195         (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 196         (pte).pte_high &= ~_PAGE_SILENT_READ;
 197         return pte;
 198 }
 199
 200 static inline pte_t pte_mkwrite(pte_t pte)
 201 {
 202         (pte).pte_low |= _PAGE_WRITE;
 203         if ((pte).pte_low & _PAGE_MODIFIED) {
 204                 (pte).pte_low |= _PAGE_SILENT_WRITE;
 205                 (pte).pte_high |= _PAGE_SILENT_WRITE;
 206         }
 207         return pte;
 208 }
 209
 210 static inline pte_t pte_mkread(pte_t pte)
 211 {
 212         (pte).pte_low |= _PAGE_READ;
 213         if ((pte).pte_low & _PAGE_ACCESSED) {
 214                 (pte).pte_low |= _PAGE_SILENT_READ;
 215                 (pte).pte_high |= _PAGE_SILENT_READ;
 216         }
 217         return pte;
 218 }
 219
 220 static inline pte_t pte_mkdirty(pte_t pte)
 221 {
 222         (pte).pte_low |= _PAGE_MODIFIED;
 223         if ((pte).pte_low & _PAGE_WRITE) {
 224                 (pte).pte_low |= _PAGE_SILENT_WRITE;
 225                 (pte).pte_high |= _PAGE_SILENT_WRITE;
 226         }
 227         return pte;
 228 }
 229
 230 static inline pte_t pte_mkyoung(pte_t pte)
 231 {
 232         (pte).pte_low |= _PAGE_ACCESSED;
 233         if ((pte).pte_low & _PAGE_READ)
 234                 (pte).pte_low |= _PAGE_SILENT_READ;
 235                 (pte).pte_high |= _PAGE_SILENT_READ;
 236         return pte;
 237 }
 238 #else
 239 static inline int pte_read(pte_t pte)   { return pte_val(pte) & _PAGE_READ; }
 240 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 241 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 242 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 243 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 244
 245 static inline pte_t pte_wrprotect(pte_t pte)
 246 {
 247         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 248         return pte;
 249 }
 250
 251 static inline pte_t pte_rdprotect(pte_t pte)
 252 {
 253         pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
 254         return pte;
 255 }
 256
 257 static inline pte_t pte_mkclean(pte_t pte)
 258 {
 259         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 260         return pte;
 261 }
 262
 263 static inline pte_t pte_mkold(pte_t pte)
 264 {
 265         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 266         return pte;
 267 }
 268
 269 static inline pte_t pte_mkwrite(pte_t pte)
 270 {
 271         pte_val(pte) |= _PAGE_WRITE;
 272         if (pte_val(pte) & _PAGE_MODIFIED)
 273                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 274         return pte;
 275 }
 276
 277 static inline pte_t pte_mkread(pte_t pte)
 278 {
 279         pte_val(pte) |= _PAGE_READ;
 280         if (pte_val(pte) & _PAGE_ACCESSED)
 281                 pte_val(pte) |= _PAGE_SILENT_READ;
 282         return pte;
 283 }
 284
 285 static inline pte_t pte_mkdirty(pte_t pte)
 286 {
 287         pte_val(pte) |= _PAGE_MODIFIED;
 288         if (pte_val(pte) & _PAGE_WRITE)
 289                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 290         return pte;
 291 }
 292
 293 static inline pte_t pte_mkyoung(pte_t pte)
 294 {
 295         pte_val(pte) |= _PAGE_ACCESSED;
 296         if (pte_val(pte) & _PAGE_READ)
 297                 pte_val(pte) |= _PAGE_SILENT_READ;
 298         return pte;
 299 }
 300 #endif
 301
 302 /*
 303  * Macro to make mark a page protection value as "uncacheable".  Note
 304  * that "protection" is really a misnomer here as the protection value
 305  * contains the memory attribute bits, dirty bits, and various other
 306  * bits as well.
 307  */
 308 #define pgprot_noncached pgprot_noncached
 309
 310 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 311 {
 312         unsigned long prot = pgprot_val(_prot);
 313
 314         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 315
 316         return __pgprot(prot);
 317 }
 318
 319 /*
 320  * Conversion functions: convert a page and protection to a page entry,
 321  * and a page entry and page directory to the page they refer to.
 322  */
 323 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 324
 325 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 326 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 327 {
 328         pte.pte_low &= _PAGE_CHG_MASK;
 329         pte.pte_low |= pgprot_val(newprot);
 330         pte.pte_high |= pgprot_val(newprot) & 0x3f;
 331         return pte;
 332 }
 333 #else
 334 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 335 {
 336         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 337 }
 338 #endif
 339
 340
 341 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 342         pte_t pte);
 343 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 344         pte_t pte);
 345
 346 static inline void update_mmu_cache(struct vm_area_struct *vma,
 347         unsigned long address, pte_t pte)
 348 {
 349         __update_tlb(vma, address, pte);
 350         __update_cache(vma, address, pte);
 351 }
 352
 353 #ifndef CONFIG_DISCONTIGMEM
 354 #define kern_addr_valid(addr)   (1)
 355 #endif
 356
 357 #ifdef CONFIG_64BIT_PHYS_ADDR
 358 extern phys_t fixup_bigphys_addr(phys_t phys_addr, phys_t size);
 359 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 360
 361 static inline int io_remap_page_range(struct vm_area_struct *vma,
 362                 unsigned long vaddr,
 363                 unsigned long paddr,
 364                 unsigned long size,
 365                 pgprot_t prot)
 366 {
 367         phys_t phys_addr_high = fixup_bigphys_addr(paddr, size);
 368         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 369 }
 370
 371 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 372                 unsigned long vaddr,
 373                 unsigned long pfn,
 374                 unsigned long size,
 375                 pgprot_t prot)
 376 {
 377         phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 378         return remap_pfn_range(vma, vaddr, pfn, size, prot);
 379 }
 380 #else
 381 #define io_remap_page_range(vma, vaddr, paddr, size, prot)              \
 382                 remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
 383 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 384                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 385 #endif
 386
 387 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 388 #define GET_IOSPACE(pfn)                0
 389 #define GET_PFN(pfn)                    (pfn)
 390
 391 #include <asm-generic/pgtable.h>
 392
 393 /*
 394  * We provide our own get_unmapped area to cope with the virtual aliasing
 395  * constraints placed on us by the cache architecture.
 396  */
 397 #define HAVE_ARCH_UNMAPPED_AREA
 398
 399 /*
 400  * No page table caches to initialise
 401  */
 402 #define pgtable_cache_init()    do { } while (0)
 403
 404 #endif /* _ASM_PGTABLE_H */