arch/sparc/include/asm/pgtable_32.h

   1 #ifndef _SPARC_PGTABLE_H
   2 #define _SPARC_PGTABLE_H
   3
   4 /*  asm/pgtable.h:  Defines and functions used to work
   5  *                        with Sparc page tables.
   6  *
   7  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   8  *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   9  */
  10
  11 #include <linux/const.h>
  12
  13 #ifndef __ASSEMBLY__
  14 #include <asm-generic/4level-fixup.h>
  15
  16 #include <linux/spinlock.h>
  17 #include <linux/swap.h>
  18 #include <asm/types.h>
  19 #include <asm/pgtsrmmu.h>
  20 #include <asm/oplib.h>
  21 #include <asm/btfixup.h>
  22 #include <asm/cpu_type.h>
  23
  24
  25 struct vm_area_struct;
  26 struct page;
  27
  28 extern void load_mmu(void);
  29 extern unsigned long calc_highpages(void);
  30
  31 #define pte_ERROR(e)   __builtin_trap()
  32 #define pmd_ERROR(e)   __builtin_trap()
  33 #define pgd_ERROR(e)   __builtin_trap()
  34
  35 #define PMD_SHIFT               22
  36 #define PMD_SIZE                (1UL << PMD_SHIFT)
  37 #define PMD_MASK                (~(PMD_SIZE-1))
  38 #define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
  39 #define PGDIR_SHIFT             SRMMU_PGDIR_SHIFT
  40 #define PGDIR_SIZE              SRMMU_PGDIR_SIZE
  41 #define PGDIR_MASK              SRMMU_PGDIR_MASK
  42 #define PTRS_PER_PTE            1024
  43 #define PTRS_PER_PMD            SRMMU_PTRS_PER_PMD
  44 #define PTRS_PER_PGD            SRMMU_PTRS_PER_PGD
  45 #define USER_PTRS_PER_PGD       PAGE_OFFSET / SRMMU_PGDIR_SIZE
  46 #define FIRST_USER_ADDRESS      0
  47 #define PTE_SIZE                (PTRS_PER_PTE*4)
  48
  49 #define PAGE_NONE       SRMMU_PAGE_NONE
  50 #define PAGE_SHARED     SRMMU_PAGE_SHARED
  51 #define PAGE_COPY       SRMMU_PAGE_COPY
  52 #define PAGE_READONLY   SRMMU_PAGE_RDONLY
  53 #define PAGE_KERNEL     SRMMU_PAGE_KERNEL
  54
  55 /* Top-level page directory */
  56 extern pgd_t swapper_pg_dir[1024];
  57
  58 extern void paging_init(void);
  59
  60 extern unsigned long ptr_in_current_pgd;
  61
  62 /*         xwr */
  63 #define __P000  PAGE_NONE
  64 #define __P001  PAGE_READONLY
  65 #define __P010  PAGE_COPY
  66 #define __P011  PAGE_COPY
  67 #define __P100  PAGE_READONLY
  68 #define __P101  PAGE_READONLY
  69 #define __P110  PAGE_COPY
  70 #define __P111  PAGE_COPY
  71
  72 #define __S000  PAGE_NONE
  73 #define __S001  PAGE_READONLY
  74 #define __S010  PAGE_SHARED
  75 #define __S011  PAGE_SHARED
  76 #define __S100  PAGE_READONLY
  77 #define __S101  PAGE_READONLY
  78 #define __S110  PAGE_SHARED
  79 #define __S111  PAGE_SHARED
  80
  81 extern int num_contexts;
  82
  83 /* First physical page can be anywhere, the following is needed so that
  84  * va-->pa and vice versa conversions work properly without performance
  85  * hit for all __pa()/__va() operations.
  86  */
  87 extern unsigned long phys_base;
  88 extern unsigned long pfn_base;
  89
  90 /*
  91  * BAD_PAGETABLE is used when we need a bogus page-table, while
  92  * BAD_PAGE is used for a bogus page.
  93  *
  94  * ZERO_PAGE is a global shared page that is always zero: used
  95  * for zero-mapped memory areas etc..
  96  */
  97 extern pte_t * __bad_pagetable(void);
  98 extern pte_t __bad_page(void);
  99 extern unsigned long empty_zero_page;
 100
 101 #define BAD_PAGETABLE __bad_pagetable()
 102 #define BAD_PAGE __bad_page()
 103 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
 104
 105 /*
 106  * In general all page table modifications should use the V8 atomic
 107  * swap instruction.  This insures the mmu and the cpu are in sync
 108  * with respect to ref/mod bits in the page tables.
 109  */
 110 static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
 111 {
 112         __asm__ __volatile__("swap [%2], %0" : "=&r" (value) : "0" (value), "r" (addr));
 113         return value;
 114 }
 115
 116 /* Certain architectures need to do special things when pte's
 117  * within a page table are directly modified.  Thus, the following
 118  * hook is made available.
 119  */
 120
 121 static inline void set_pte(pte_t *ptep, pte_t pteval)
 122 {
 123         srmmu_swap((unsigned long *)ptep, pte_val(pteval));
 124 }
 125
 126 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 127
 128 static inline int srmmu_device_memory(unsigned long x)
 129 {
 130         return ((x & 0xF0000000) != 0);
 131 }
 132
 133 static inline struct page *pmd_page(pmd_t pmd)
 134 {
 135         if (srmmu_device_memory(pmd_val(pmd)))
 136                 BUG();
 137         return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
 138 }
 139
 140 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
 141
 142 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
 143
 144 static inline int pte_present(pte_t pte)
 145 {
 146         return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE);
 147 }
 148
 149 static inline int pte_none(pte_t pte)
 150 {
 151         return !pte_val(pte);
 152 }
 153
 154 static inline void __pte_clear(pte_t *ptep)
 155 {
 156         set_pte(ptep, __pte(0));
 157 }
 158
 159 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 160 {
 161         __pte_clear(ptep);
 162 }
 163
 164 static inline int pmd_bad(pmd_t pmd)
 165 {
 166         return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
 167 }
 168
 169 static inline int pmd_present(pmd_t pmd)
 170 {
 171         return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
 172 }
 173
 174 static inline int pmd_none(pmd_t pmd)
 175 {
 176         return !pmd_val(pmd);
 177 }
 178
 179 static inline void pmd_clear(pmd_t *pmdp)
 180 {
 181         int i;
 182         for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++)
 183                 set_pte((pte_t *)&pmdp->pmdv[i], __pte(0));
 184 }
 185
 186 static inline int pgd_none(pgd_t pgd)
 187 {
 188         return !(pgd_val(pgd) & 0xFFFFFFF);
 189 }
 190
 191 static inline int pgd_bad(pgd_t pgd)
 192 {
 193         return (pgd_val(pgd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
 194 }
 195
 196 static inline int pgd_present(pgd_t pgd)
 197 {
 198         return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
 199 }
 200
 201 static inline void pgd_clear(pgd_t *pgdp)
 202 {
 203         set_pte((pte_t *)pgdp, __pte(0));
 204 }
 205
 206 /*
 207  * The following only work if pte_present() is true.
 208  * Undefined behaviour if not..
 209  */
 210 static inline int pte_write(pte_t pte)
 211 {
 212         return pte_val(pte) & SRMMU_WRITE;
 213 }
 214
 215 static inline int pte_dirty(pte_t pte)
 216 {
 217         return pte_val(pte) & SRMMU_DIRTY;
 218 }
 219
 220 static inline int pte_young(pte_t pte)
 221 {
 222         return pte_val(pte) & SRMMU_REF;
 223 }
 224
 225 /*
 226  * The following only work if pte_present() is not true.
 227  */
 228 static inline int pte_file(pte_t pte)
 229 {
 230         return pte_val(pte) & SRMMU_FILE;
 231 }
 232
 233 static inline int pte_special(pte_t pte)
 234 {
 235         return 0;
 236 }
 237
 238 static inline pte_t pte_wrprotect(pte_t pte)
 239 {
 240         return __pte(pte_val(pte) & ~SRMMU_WRITE);
 241 }
 242
 243 static inline pte_t pte_mkclean(pte_t pte)
 244 {
 245         return __pte(pte_val(pte) & ~SRMMU_DIRTY);
 246 }
 247
 248 static inline pte_t pte_mkold(pte_t pte)
 249 {
 250         return __pte(pte_val(pte) & ~SRMMU_REF);
 251 }
 252
 253 static inline pte_t pte_mkwrite(pte_t pte)
 254 {
 255         return __pte(pte_val(pte) | SRMMU_WRITE);
 256 }
 257
 258 static inline pte_t pte_mkdirty(pte_t pte)
 259 {
 260         return __pte(pte_val(pte) | SRMMU_DIRTY);
 261 }
 262
 263 static inline pte_t pte_mkyoung(pte_t pte)
 264 {
 265         return __pte(pte_val(pte) | SRMMU_REF);
 266 }
 267
 268 #define pte_mkspecial(pte)    (pte)
 269
 270 #define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
 271
 272 static inline unsigned long pte_pfn(pte_t pte)
 273 {
 274         if (srmmu_device_memory(pte_val(pte))) {
 275                 /* Just return something that will cause
 276                  * pfn_valid() to return false.  This makes
 277                  * copy_one_pte() to just directly copy to
 278                  * PTE over.
 279                  */
 280                 return ~0UL;
 281         }
 282         return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
 283 }
 284
 285 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 286
 287 /*
 288  * Conversion functions: convert a page and protection to a page entry,
 289  * and a page entry and page directory to the page they refer to.
 290  */
 291 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
 292 {
 293         return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot));
 294 }
 295
 296 static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
 297 {
 298         return __pte(((page) >> 4) | pgprot_val(pgprot));
 299 }
 300
 301 static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
 302 {
 303         return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot));
 304 }
 305
 306 #define pgprot_noncached pgprot_noncached
 307 static inline pgprot_t pgprot_noncached(pgprot_t prot)
 308 {
 309         prot &= ~__pgprot(SRMMU_CACHE);
 310         return prot;
 311 }
 312
 313 BTFIXUPDEF_INT(pte_modify_mask)
 314
 315 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 316 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 317 {
 318         return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 319                 pgprot_val(newprot));
 320 }
 321
 322 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 323
 324 /* to find an entry in a page-table-directory */
 325 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 326
 327 /* to find an entry in a kernel page-table-directory */
 328 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 329
 330 /* Find an entry in the second-level page table.. */
 331 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 332 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 333
 334 /* Find an entry in the third-level page table.. */
 335 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 336 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
 337
 338 /*
 339  * This shortcut works on sun4m (and sun4d) because the nocache area is static.
 340  */
 341 #define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 342 #define pte_unmap(pte)          do{}while(0)
 343
 344 struct seq_file;
 345 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
 346
 347 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
 348
 349 /* Fault handler stuff... */
 350 #define FAULT_CODE_PROT     0x1
 351 #define FAULT_CODE_WRITE    0x2
 352 #define FAULT_CODE_USER     0x4
 353
 354 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *)
 355
 356 #define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
 357
 358 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
 359     unsigned long, unsigned int)
 360 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
 361 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
 362 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
 363
 364 extern int invalid_segment;
 365
 366 /* Encode and de-code a swap entry */
 367 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
 368 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
 369 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
 370
 371 #define __swp_type(__x)                 BTFIXUP_CALL(__swp_type)(__x)
 372 #define __swp_offset(__x)               BTFIXUP_CALL(__swp_offset)(__x)
 373 #define __swp_entry(__type,__off)       BTFIXUP_CALL(__swp_entry)(__type,__off)
 374
 375 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 376 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 377
 378 /* file-offset-in-pte helpers */
 379 static inline unsigned long pte_to_pgoff(pte_t pte)
 380 {
 381         return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT;
 382 }
 383
 384 static inline pte_t pgoff_to_pte(unsigned long pgoff)
 385 {
 386         return __pte((pgoff << SRMMU_PTE_FILE_SHIFT) | SRMMU_FILE);
 387 }
 388
 389 /*
 390  * This is made a constant because mm/fremap.c required a constant.
 391  */
 392 #define PTE_FILE_MAX_BITS 24
 393
 394 /*
 395  */
 396 struct ctx_list {
 397         struct ctx_list *next;
 398         struct ctx_list *prev;
 399         unsigned int ctx_number;
 400         struct mm_struct *ctx_mm;
 401 };
 402
 403 extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 404 extern struct ctx_list ctx_free;        /* Head of free list */
 405 extern struct ctx_list ctx_used;        /* Head of used contexts list */
 406
 407 #define NO_CONTEXT     -1
 408
 409 static inline void remove_from_ctx_list(struct ctx_list *entry)
 410 {
 411         entry->next->prev = entry->prev;
 412         entry->prev->next = entry->next;
 413 }
 414
 415 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
 416 {
 417         entry->next = head;
 418         (entry->prev = head->prev)->next = entry;
 419         head->prev = entry;
 420 }
 421 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 422 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
 423
 424 static inline unsigned long
 425 __get_phys (unsigned long addr)
 426 {
 427         switch (sparc_cpu_model){
 428         case sun4m:
 429         case sun4d:
 430                 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 431         default:
 432                 return 0;
 433         }
 434 }
 435
 436 static inline int
 437 __get_iospace (unsigned long addr)
 438 {
 439         switch (sparc_cpu_model){
 440         case sun4m:
 441         case sun4d:
 442                 return (srmmu_get_pte (addr) >> 28);
 443         default:
 444                 return -1;
 445         }
 446 }
 447
 448 extern unsigned long *sparc_valid_addr_bitmap;
 449
 450 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 451 #define kern_addr_valid(addr) \
 452         (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 453
 454 /*
 455  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 456  * its high 4 bits.  These macros/functions put it there or get it from there.
 457  */
 458 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 459 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 460 #define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 461
 462 extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
 463                            unsigned long, pgprot_t);
 464
 465 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 466                                      unsigned long from, unsigned long pfn,
 467                                      unsigned long size, pgprot_t prot)
 468 {
 469         unsigned long long offset, space, phys_base;
 470
 471         offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
 472         space = GET_IOSPACE(pfn);
 473         phys_base = offset | (space << 32ULL);
 474
 475         return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
 476 }
 477
 478 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 479 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 480 ({                                                                        \
 481         int __changed = !pte_same(*(__ptep), __entry);                    \
 482         if (__changed) {                                                  \
 483                 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 484                 flush_tlb_page(__vma, __address);                         \
 485         }                                                                 \
 486         __changed;                                                        \
 487 })
 488
 489 #include <asm-generic/pgtable.h>
 490
 491 #endif /* !(__ASSEMBLY__) */
 492
 493 #define VMALLOC_START           _AC(0xfe600000,UL)
 494 #define VMALLOC_END             _AC(0xffc00000,UL)
 495
 496 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 497 #define HAVE_ARCH_UNMAPPED_AREA
 498
 499 /*
 500  * No page table caches to initialise
 501  */
 502 #define pgtable_cache_init()    do { } while (0)
 503
 504 #endif /* !(_SPARC_PGTABLE_H) */