include/asm-sparc/pgtable.h

   1 /* $Id: pgtable.h,v 1.110 2001/12/21 04:56:17 davem Exp $ */
   2 #ifndef _SPARC_PGTABLE_H
   3 #define _SPARC_PGTABLE_H
   4
   5 /*  asm-sparc/pgtable.h:  Defines and functions used to work
   6  *                        with Sparc page tables.
   7  *
   8  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   9  *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  10  */
  11
  12 #include <asm-generic/4level-fixup.h>
  13
  14 #include <linux/spinlock.h>
  15 #include <linux/swap.h>
  16 #include <asm/types.h>
  17 #ifdef CONFIG_SUN4
  18 #include <asm/pgtsun4.h>
  19 #else
  20 #include <asm/pgtsun4c.h>
  21 #endif
  22 #include <asm/pgtsrmmu.h>
  23 #include <asm/vac-ops.h>
  24 #include <asm/oplib.h>
  25 #include <asm/btfixup.h>
  26 #include <asm/system.h>
  27
  28 #ifndef __ASSEMBLY__
  29
  30 struct vm_area_struct;
  31 struct page;
  32
  33 extern void load_mmu(void);
  34 extern unsigned long calc_highpages(void);
  35
  36 BTFIXUPDEF_SIMM13(pgdir_shift)
  37 BTFIXUPDEF_SETHI(pgdir_size)
  38 BTFIXUPDEF_SETHI(pgdir_mask)
  39
  40 BTFIXUPDEF_SIMM13(ptrs_per_pmd)
  41 BTFIXUPDEF_SIMM13(ptrs_per_pgd)
  42 BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
  43
  44 #define pte_ERROR(e)   __builtin_trap()
  45 #define pmd_ERROR(e)   __builtin_trap()
  46 #define pgd_ERROR(e)   __builtin_trap()
  47
  48 BTFIXUPDEF_INT(page_none)
  49 BTFIXUPDEF_INT(page_copy)
  50 BTFIXUPDEF_INT(page_readonly)
  51 BTFIXUPDEF_INT(page_kernel)
  52
  53 #define PMD_SHIFT               SUN4C_PMD_SHIFT
  54 #define PMD_SIZE                (1UL << PMD_SHIFT)
  55 #define PMD_MASK                (~(PMD_SIZE-1))
  56 #define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
  57 #define PGDIR_SHIFT             BTFIXUP_SIMM13(pgdir_shift)
  58 #define PGDIR_SIZE              BTFIXUP_SETHI(pgdir_size)
  59 #define PGDIR_MASK              BTFIXUP_SETHI(pgdir_mask)
  60 #define PTRS_PER_PTE            1024
  61 #define PTRS_PER_PMD            BTFIXUP_SIMM13(ptrs_per_pmd)
  62 #define PTRS_PER_PGD            BTFIXUP_SIMM13(ptrs_per_pgd)
  63 #define USER_PTRS_PER_PGD       BTFIXUP_SIMM13(user_ptrs_per_pgd)
  64 #define FIRST_USER_ADDRESS      0
  65 #define PTE_SIZE                (PTRS_PER_PTE*4)
  66
  67 #define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))
  68 extern pgprot_t PAGE_SHARED;
  69 #define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))
  70 #define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly))
  71
  72 extern unsigned long page_kernel;
  73
  74 #ifdef MODULE
  75 #define PAGE_KERNEL     page_kernel
  76 #else
  77 #define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))
  78 #endif
  79
  80 /* Top-level page directory */
  81 extern pgd_t swapper_pg_dir[1024];
  82
  83 extern void paging_init(void);
  84
  85 /* Page table for 0-4MB for everybody, on the Sparc this
  86  * holds the same as on the i386.
  87  */
  88 extern pte_t pg0[1024];
  89 extern pte_t pg1[1024];
  90 extern pte_t pg2[1024];
  91 extern pte_t pg3[1024];
  92
  93 extern unsigned long ptr_in_current_pgd;
  94
  95 /* Here is a trick, since mmap.c need the initializer elements for
  96  * protection_map[] to be constant at compile time, I set the following
  97  * to all zeros.  I set it to the real values after I link in the
  98  * appropriate MMU page table routines at boot time.
  99  */
 100 #define __P000  __pgprot(0)
 101 #define __P001  __pgprot(0)
 102 #define __P010  __pgprot(0)
 103 #define __P011  __pgprot(0)
 104 #define __P100  __pgprot(0)
 105 #define __P101  __pgprot(0)
 106 #define __P110  __pgprot(0)
 107 #define __P111  __pgprot(0)
 108
 109 #define __S000  __pgprot(0)
 110 #define __S001  __pgprot(0)
 111 #define __S010  __pgprot(0)
 112 #define __S011  __pgprot(0)
 113 #define __S100  __pgprot(0)
 114 #define __S101  __pgprot(0)
 115 #define __S110  __pgprot(0)
 116 #define __S111  __pgprot(0)
 117
 118 extern int num_contexts;
 119
 120 /* First physical page can be anywhere, the following is needed so that
 121  * va-->pa and vice versa conversions work properly without performance
 122  * hit for all __pa()/__va() operations.
 123  */
 124 extern unsigned long phys_base;
 125 extern unsigned long pfn_base;
 126
 127 /*
 128  * BAD_PAGETABLE is used when we need a bogus page-table, while
 129  * BAD_PAGE is used for a bogus page.
 130  *
 131  * ZERO_PAGE is a global shared page that is always zero: used
 132  * for zero-mapped memory areas etc..
 133  */
 134 extern pte_t * __bad_pagetable(void);
 135 extern pte_t __bad_page(void);
 136 extern unsigned long empty_zero_page;
 137
 138 #define BAD_PAGETABLE __bad_pagetable()
 139 #define BAD_PAGE __bad_page()
 140 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
 141
 142 /*
 143  */
 144 BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
 145 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
 146
 147 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
 148 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
 149
 150 BTFIXUPDEF_SETHI(none_mask)
 151 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
 152 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
 153
 154 static inline int pte_none(pte_t pte)
 155 {
 156         return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
 157 }
 158
 159 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 160 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
 161
 162 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 163 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 164 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
 165
 166 static inline int pmd_none(pmd_t pmd)
 167 {
 168         return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
 169 }
 170
 171 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 172 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 173 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
 174
 175 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 176 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 177 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 178 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
 179
 180 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 181 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 182 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 183 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
 184
 185 /*
 186  * The following only work if pte_present() is true.
 187  * Undefined behaviour if not..
 188  */
 189 BTFIXUPDEF_HALF(pte_writei)
 190 BTFIXUPDEF_HALF(pte_dirtyi)
 191 BTFIXUPDEF_HALF(pte_youngi)
 192
 193 static int pte_write(pte_t pte) __attribute_const__;
 194 static inline int pte_write(pte_t pte)
 195 {
 196         return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 197 }
 198
 199 static int pte_dirty(pte_t pte) __attribute_const__;
 200 static inline int pte_dirty(pte_t pte)
 201 {
 202         return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 203 }
 204
 205 static int pte_young(pte_t pte) __attribute_const__;
 206 static inline int pte_young(pte_t pte)
 207 {
 208         return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 209 }
 210
 211 /*
 212  * The following only work if pte_present() is not true.
 213  */
 214 BTFIXUPDEF_HALF(pte_filei)
 215
 216 static int pte_file(pte_t pte) __attribute_const__;
 217 static inline int pte_file(pte_t pte)
 218 {
 219         return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 220 }
 221
 222 /*
 223  */
 224 BTFIXUPDEF_HALF(pte_wrprotecti)
 225 BTFIXUPDEF_HALF(pte_mkcleani)
 226 BTFIXUPDEF_HALF(pte_mkoldi)
 227
 228 static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
 229 static inline pte_t pte_wrprotect(pte_t pte)
 230 {
 231         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
 232 }
 233
 234 static pte_t pte_mkclean(pte_t pte) __attribute_const__;
 235 static inline pte_t pte_mkclean(pte_t pte)
 236 {
 237         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
 238 }
 239
 240 static pte_t pte_mkold(pte_t pte) __attribute_const__;
 241 static inline pte_t pte_mkold(pte_t pte)
 242 {
 243         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
 244 }
 245
 246 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
 247 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
 248 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
 249
 250 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
 251 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
 252 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
 253
 254 #define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
 255
 256 BTFIXUPDEF_CALL(unsigned long,   pte_pfn, pte_t)
 257 #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
 258 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 259
 260 /*
 261  * Conversion functions: convert a page and protection to a page entry,
 262  * and a page entry and page directory to the page they refer to.
 263  */
 264 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
 265
 266 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
 267 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
 268 BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
 269
 270 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 271 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 272 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
 273
 274 #define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
 275
 276 BTFIXUPDEF_INT(pte_modify_mask)
 277
 278 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 279 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 280 {
 281         return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 282                 pgprot_val(newprot));
 283 }
 284
 285 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 286
 287 /* to find an entry in a page-table-directory */
 288 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 289
 290 /* to find an entry in a kernel page-table-directory */
 291 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 292
 293 /* Find an entry in the second-level page table.. */
 294 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 295 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 296
 297 /* Find an entry in the third-level page table.. */
 298 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 299 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
 300
 301 /*
 302  * This shortcut works on sun4m (and sun4d) because the nocache area is static,
 303  * and sun4c is guaranteed to have no highmem anyway.
 304  */
 305 #define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 306 #define pte_offset_map_nested(d, a)     pte_offset_kernel(d,a)
 307
 308 #define pte_unmap(pte)          do{}while(0)
 309 #define pte_unmap_nested(pte)   do{}while(0)
 310
 311 /* Certain architectures need to do special things when pte's
 312  * within a page table are directly modified.  Thus, the following
 313  * hook is made available.
 314  */
 315
 316 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
 317
 318 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
 319 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 320
 321 struct seq_file;
 322 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
 323
 324 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
 325
 326 /* Fault handler stuff... */
 327 #define FAULT_CODE_PROT     0x1
 328 #define FAULT_CODE_WRITE    0x2
 329 #define FAULT_CODE_USER     0x4
 330
 331 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
 332
 333 #define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
 334
 335 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
 336     unsigned long, unsigned int)
 337 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
 338 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
 339 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
 340
 341 extern int invalid_segment;
 342
 343 /* Encode and de-code a swap entry */
 344 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
 345 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
 346 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
 347
 348 #define __swp_type(__x)                 BTFIXUP_CALL(__swp_type)(__x)
 349 #define __swp_offset(__x)               BTFIXUP_CALL(__swp_offset)(__x)
 350 #define __swp_entry(__type,__off)       BTFIXUP_CALL(__swp_entry)(__type,__off)
 351
 352 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 353 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 354
 355 /* file-offset-in-pte helpers */
 356 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
 357 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
 358
 359 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
 360 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
 361
 362 /*
 363  * This is made a constant because mm/fremap.c required a constant.
 364  * Note that layout of these bits is different between sun4c.c and srmmu.c.
 365  */
 366 #define PTE_FILE_MAX_BITS 24
 367
 368 /*
 369  */
 370 struct ctx_list {
 371         struct ctx_list *next;
 372         struct ctx_list *prev;
 373         unsigned int ctx_number;
 374         struct mm_struct *ctx_mm;
 375 };
 376
 377 extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 378 extern struct ctx_list ctx_free;        /* Head of free list */
 379 extern struct ctx_list ctx_used;        /* Head of used contexts list */
 380
 381 #define NO_CONTEXT     -1
 382
 383 static inline void remove_from_ctx_list(struct ctx_list *entry)
 384 {
 385         entry->next->prev = entry->prev;
 386         entry->prev->next = entry->next;
 387 }
 388
 389 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
 390 {
 391         entry->next = head;
 392         (entry->prev = head->prev)->next = entry;
 393         head->prev = entry;
 394 }
 395 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 396 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
 397
 398 static inline unsigned long
 399 __get_phys (unsigned long addr)
 400 {
 401         switch (sparc_cpu_model){
 402         case sun4:
 403         case sun4c:
 404                 return sun4c_get_pte (addr) << PAGE_SHIFT;
 405         case sun4m:
 406         case sun4d:
 407                 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 408         default:
 409                 return 0;
 410         }
 411 }
 412
 413 static inline int
 414 __get_iospace (unsigned long addr)
 415 {
 416         switch (sparc_cpu_model){
 417         case sun4:
 418         case sun4c:
 419                 return -1; /* Don't check iospace on sun4c */
 420         case sun4m:
 421         case sun4d:
 422                 return (srmmu_get_pte (addr) >> 28);
 423         default:
 424                 return -1;
 425         }
 426 }
 427
 428 extern unsigned long *sparc_valid_addr_bitmap;
 429
 430 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 431 #define kern_addr_valid(addr) \
 432         (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 433
 434 extern int io_remap_pfn_range(struct vm_area_struct *vma,
 435                               unsigned long from, unsigned long pfn,
 436                               unsigned long size, pgprot_t prot);
 437
 438 /*
 439  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 440  * its high 4 bits.  These macros/functions put it there or get it from there.
 441  */
 442 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 443 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 444 #define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 445
 446 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 447 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 448 ({                                                                        \
 449         int __changed = !pte_same(*(__ptep), __entry);                    \
 450         if (__changed) {                                                  \
 451                 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 452                 flush_tlb_page(__vma, __address);                         \
 453         }                                                                 \
 454         (sparc_cpu_model == sun4c) || __changed;                          \
 455 })
 456
 457 #include <asm-generic/pgtable.h>
 458
 459 #endif /* !(__ASSEMBLY__) */
 460
 461 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 462 #define HAVE_ARCH_UNMAPPED_AREA
 463
 464 /*
 465  * No page table caches to initialise
 466  */
 467 #define pgtable_cache_init()    do { } while (0)
 468
 469 #endif /* !(_SPARC_PGTABLE_H) */