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_shared)
  50 BTFIXUPDEF_INT(page_copy)
  51 BTFIXUPDEF_INT(page_readonly)
  52 BTFIXUPDEF_INT(page_kernel)
  53
  54 #define PMD_SHIFT               SUN4C_PMD_SHIFT
  55 #define PMD_SIZE                (1UL << PMD_SHIFT)
  56 #define PMD_MASK                (~(PMD_SIZE-1))
  57 #define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
  58 #define PGDIR_SHIFT             BTFIXUP_SIMM13(pgdir_shift)
  59 #define PGDIR_SIZE              BTFIXUP_SETHI(pgdir_size)
  60 #define PGDIR_MASK              BTFIXUP_SETHI(pgdir_mask)
  61 #define PTRS_PER_PTE            1024
  62 #define PTRS_PER_PMD            BTFIXUP_SIMM13(ptrs_per_pmd)
  63 #define PTRS_PER_PGD            BTFIXUP_SIMM13(ptrs_per_pgd)
  64 #define USER_PTRS_PER_PGD       BTFIXUP_SIMM13(user_ptrs_per_pgd)
  65 #define FIRST_USER_ADDRESS      0
  66 #define PTE_SIZE                (PTRS_PER_PTE*4)
  67
  68 #define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))
  69 #define PAGE_SHARED    __pgprot(BTFIXUP_INT(page_shared))
  70 #define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))
  71 #define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly))
  72
  73 extern unsigned long page_kernel;
  74
  75 #ifdef MODULE
  76 #define PAGE_KERNEL     page_kernel
  77 #else
  78 #define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))
  79 #endif
  80
  81 /* Top-level page directory */
  82 extern pgd_t swapper_pg_dir[1024];
  83
  84 extern void paging_init(void);
  85
  86 /* Page table for 0-4MB for everybody, on the Sparc this
  87  * holds the same as on the i386.
  88  */
  89 extern pte_t pg0[1024];
  90 extern pte_t pg1[1024];
  91 extern pte_t pg2[1024];
  92 extern pte_t pg3[1024];
  93
  94 extern unsigned long ptr_in_current_pgd;
  95
  96 /* Here is a trick, since mmap.c need the initializer elements for
  97  * protection_map[] to be constant at compile time, I set the following
  98  * to all zeros.  I set it to the real values after I link in the
  99  * appropriate MMU page table routines at boot time.
 100  */
 101 #define __P000  __pgprot(0)
 102 #define __P001  __pgprot(0)
 103 #define __P010  __pgprot(0)
 104 #define __P011  __pgprot(0)
 105 #define __P100  __pgprot(0)
 106 #define __P101  __pgprot(0)
 107 #define __P110  __pgprot(0)
 108 #define __P111  __pgprot(0)
 109
 110 #define __S000  __pgprot(0)
 111 #define __S001  __pgprot(0)
 112 #define __S010  __pgprot(0)
 113 #define __S011  __pgprot(0)
 114 #define __S100  __pgprot(0)
 115 #define __S101  __pgprot(0)
 116 #define __S110  __pgprot(0)
 117 #define __S111  __pgprot(0)
 118
 119 extern int num_contexts;
 120
 121 /* First physical page can be anywhere, the following is needed so that
 122  * va-->pa and vice versa conversions work properly without performance
 123  * hit for all __pa()/__va() operations.
 124  */
 125 extern unsigned long phys_base;
 126 extern unsigned long pfn_base;
 127
 128 /*
 129  * BAD_PAGETABLE is used when we need a bogus page-table, while
 130  * BAD_PAGE is used for a bogus page.
 131  *
 132  * ZERO_PAGE is a global shared page that is always zero: used
 133  * for zero-mapped memory areas etc..
 134  */
 135 extern pte_t * __bad_pagetable(void);
 136 extern pte_t __bad_page(void);
 137 extern unsigned long empty_zero_page;
 138
 139 #define BAD_PAGETABLE __bad_pagetable()
 140 #define BAD_PAGE __bad_page()
 141 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
 142
 143 /*
 144  */
 145 BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
 146 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
 147
 148 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
 149 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
 150
 151 BTFIXUPDEF_SETHI(none_mask)
 152 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
 153 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
 154 BTFIXUPDEF_CALL(int, pte_read, pte_t)
 155
 156 static inline int pte_none(pte_t pte)
 157 {
 158         return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
 159 }
 160
 161 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 162 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
 163 #define pte_read(pte) BTFIXUP_CALL(pte_read)(pte)
 164
 165 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 166 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 167 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
 168
 169 static inline int pmd_none(pmd_t pmd)
 170 {
 171         return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
 172 }
 173
 174 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 175 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 176 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
 177
 178 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 179 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 180 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 181 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
 182
 183 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 184 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 185 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 186 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
 187
 188 /*
 189  * The following only work if pte_present() is true.
 190  * Undefined behaviour if not..
 191  */
 192 BTFIXUPDEF_HALF(pte_writei)
 193 BTFIXUPDEF_HALF(pte_dirtyi)
 194 BTFIXUPDEF_HALF(pte_youngi)
 195
 196 static int pte_write(pte_t pte) __attribute_const__;
 197 static inline int pte_write(pte_t pte)
 198 {
 199         return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 200 }
 201
 202 static int pte_dirty(pte_t pte) __attribute_const__;
 203 static inline int pte_dirty(pte_t pte)
 204 {
 205         return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 206 }
 207
 208 static int pte_young(pte_t pte) __attribute_const__;
 209 static inline int pte_young(pte_t pte)
 210 {
 211         return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 212 }
 213
 214 /*
 215  * The following only work if pte_present() is not true.
 216  */
 217 BTFIXUPDEF_HALF(pte_filei)
 218
 219 static int pte_file(pte_t pte) __attribute_const__;
 220 static inline int pte_file(pte_t pte)
 221 {
 222         return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 223 }
 224
 225 /*
 226  */
 227 BTFIXUPDEF_HALF(pte_wrprotecti)
 228 BTFIXUPDEF_HALF(pte_mkcleani)
 229 BTFIXUPDEF_HALF(pte_mkoldi)
 230
 231 static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
 232 static inline pte_t pte_wrprotect(pte_t pte)
 233 {
 234         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
 235 }
 236
 237 static pte_t pte_mkclean(pte_t pte) __attribute_const__;
 238 static inline pte_t pte_mkclean(pte_t pte)
 239 {
 240         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
 241 }
 242
 243 static pte_t pte_mkold(pte_t pte) __attribute_const__;
 244 static inline pte_t pte_mkold(pte_t pte)
 245 {
 246         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
 247 }
 248
 249 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
 250 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
 251 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
 252
 253 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
 254 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
 255 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
 256
 257 #define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
 258
 259 BTFIXUPDEF_CALL(unsigned long,   pte_pfn, pte_t)
 260 #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
 261 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 262
 263 /*
 264  * Conversion functions: convert a page and protection to a page entry,
 265  * and a page entry and page directory to the page they refer to.
 266  */
 267 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
 268
 269 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
 270 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
 271 BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
 272
 273 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 274 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 275 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
 276
 277 #define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
 278
 279 BTFIXUPDEF_INT(pte_modify_mask)
 280
 281 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 282 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 283 {
 284         return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 285                 pgprot_val(newprot));
 286 }
 287
 288 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 289
 290 /* to find an entry in a page-table-directory */
 291 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 292
 293 /* to find an entry in a kernel page-table-directory */
 294 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 295
 296 /* Find an entry in the second-level page table.. */
 297 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 298 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 299
 300 /* Find an entry in the third-level page table.. */
 301 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 302 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
 303
 304 /*
 305  * This shortcut works on sun4m (and sun4d) because the nocache area is static,
 306  * and sun4c is guaranteed to have no highmem anyway.
 307  */
 308 #define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 309 #define pte_offset_map_nested(d, a)     pte_offset_kernel(d,a)
 310
 311 #define pte_unmap(pte)          do{}while(0)
 312 #define pte_unmap_nested(pte)   do{}while(0)
 313
 314 /* Certain architectures need to do special things when pte's
 315  * within a page table are directly modified.  Thus, the following
 316  * hook is made available.
 317  */
 318
 319 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
 320
 321 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
 322 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 323
 324 struct seq_file;
 325 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
 326
 327 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
 328
 329 /* Fault handler stuff... */
 330 #define FAULT_CODE_PROT     0x1
 331 #define FAULT_CODE_WRITE    0x2
 332 #define FAULT_CODE_USER     0x4
 333
 334 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
 335
 336 #define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
 337
 338 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
 339     unsigned long, unsigned int)
 340 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
 341 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
 342 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
 343
 344 extern int invalid_segment;
 345
 346 /* Encode and de-code a swap entry */
 347 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
 348 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
 349 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
 350
 351 #define __swp_type(__x)                 BTFIXUP_CALL(__swp_type)(__x)
 352 #define __swp_offset(__x)               BTFIXUP_CALL(__swp_offset)(__x)
 353 #define __swp_entry(__type,__off)       BTFIXUP_CALL(__swp_entry)(__type,__off)
 354
 355 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 356 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 357
 358 /* file-offset-in-pte helpers */
 359 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
 360 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
 361
 362 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
 363 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
 364
 365 /*
 366  * This is made a constant because mm/fremap.c required a constant.
 367  * Note that layout of these bits is different between sun4c.c and srmmu.c.
 368  */
 369 #define PTE_FILE_MAX_BITS 24
 370
 371 /*
 372  */
 373 struct ctx_list {
 374         struct ctx_list *next;
 375         struct ctx_list *prev;
 376         unsigned int ctx_number;
 377         struct mm_struct *ctx_mm;
 378 };
 379
 380 extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 381 extern struct ctx_list ctx_free;        /* Head of free list */
 382 extern struct ctx_list ctx_used;        /* Head of used contexts list */
 383
 384 #define NO_CONTEXT     -1
 385
 386 static inline void remove_from_ctx_list(struct ctx_list *entry)
 387 {
 388         entry->next->prev = entry->prev;
 389         entry->prev->next = entry->next;
 390 }
 391
 392 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
 393 {
 394         entry->next = head;
 395         (entry->prev = head->prev)->next = entry;
 396         head->prev = entry;
 397 }
 398 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 399 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
 400
 401 static inline unsigned long
 402 __get_phys (unsigned long addr)
 403 {
 404         switch (sparc_cpu_model){
 405         case sun4:
 406         case sun4c:
 407                 return sun4c_get_pte (addr) << PAGE_SHIFT;
 408         case sun4m:
 409         case sun4d:
 410                 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 411         default:
 412                 return 0;
 413         }
 414 }
 415
 416 static inline int
 417 __get_iospace (unsigned long addr)
 418 {
 419         switch (sparc_cpu_model){
 420         case sun4:
 421         case sun4c:
 422                 return -1; /* Don't check iospace on sun4c */
 423         case sun4m:
 424         case sun4d:
 425                 return (srmmu_get_pte (addr) >> 28);
 426         default:
 427                 return -1;
 428         }
 429 }
 430
 431 extern unsigned long *sparc_valid_addr_bitmap;
 432
 433 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 434 #define kern_addr_valid(addr) \
 435         (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 436
 437 extern int io_remap_pfn_range(struct vm_area_struct *vma,
 438                               unsigned long from, unsigned long pfn,
 439                               unsigned long size, pgprot_t prot);
 440
 441 /*
 442  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 443  * its high 4 bits.  These macros/functions put it there or get it from there.
 444  */
 445 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 446 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 447 #define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 448
 449 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 450 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 451 ({                                                                        \
 452         int __changed = !pte_same(*(__ptep), __entry);                    \
 453         if (__changed) {                                                  \
 454                 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 455                 flush_tlb_page(__vma, __address);                         \
 456         }                                                                 \
 457         (sparc_cpu_model == sun4c) || __changed;                          \
 458 })
 459
 460 #include <asm-generic/pgtable.h>
 461
 462 #endif /* !(__ASSEMBLY__) */
 463
 464 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 465 #define HAVE_ARCH_UNMAPPED_AREA
 466
 467 /*
 468  * No page table caches to initialise
 469  */
 470 #define pgtable_cache_init()    do { } while (0)
 471
 472 #endif /* !(_SPARC_PGTABLE_H) */