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
 155 static inline int pte_none(pte_t pte)
 156 {
 157         return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
 158 }
 159
 160 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 161 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
 162
 163 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 164 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 165 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
 166
 167 static inline int pmd_none(pmd_t pmd)
 168 {
 169         return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
 170 }
 171
 172 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 173 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 174 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
 175
 176 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 177 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 178 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 179 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
 180
 181 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 182 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 183 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 184 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
 185
 186 /*
 187  * The following only work if pte_present() is true.
 188  * Undefined behaviour if not..
 189  */
 190 BTFIXUPDEF_HALF(pte_writei)
 191 BTFIXUPDEF_HALF(pte_dirtyi)
 192 BTFIXUPDEF_HALF(pte_youngi)
 193
 194 static int pte_write(pte_t pte) __attribute_const__;
 195 static inline int pte_write(pte_t pte)
 196 {
 197         return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 198 }
 199
 200 static int pte_dirty(pte_t pte) __attribute_const__;
 201 static inline int pte_dirty(pte_t pte)
 202 {
 203         return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 204 }
 205
 206 static int pte_young(pte_t pte) __attribute_const__;
 207 static inline int pte_young(pte_t pte)
 208 {
 209         return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 210 }
 211
 212 /*
 213  * The following only work if pte_present() is not true.
 214  */
 215 BTFIXUPDEF_HALF(pte_filei)
 216
 217 static int pte_file(pte_t pte) __attribute_const__;
 218 static inline int pte_file(pte_t pte)
 219 {
 220         return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 221 }
 222
 223 /*
 224  */
 225 BTFIXUPDEF_HALF(pte_wrprotecti)
 226 BTFIXUPDEF_HALF(pte_mkcleani)
 227 BTFIXUPDEF_HALF(pte_mkoldi)
 228
 229 static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
 230 static inline pte_t pte_wrprotect(pte_t pte)
 231 {
 232         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
 233 }
 234
 235 static pte_t pte_mkclean(pte_t pte) __attribute_const__;
 236 static inline pte_t pte_mkclean(pte_t pte)
 237 {
 238         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
 239 }
 240
 241 static pte_t pte_mkold(pte_t pte) __attribute_const__;
 242 static inline pte_t pte_mkold(pte_t pte)
 243 {
 244         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
 245 }
 246
 247 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
 248 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
 249 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
 250
 251 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
 252 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
 253 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
 254
 255 #define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
 256
 257 BTFIXUPDEF_CALL(unsigned long,   pte_pfn, pte_t)
 258 #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
 259 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 260
 261 /*
 262  * Conversion functions: convert a page and protection to a page entry,
 263  * and a page entry and page directory to the page they refer to.
 264  */
 265 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
 266
 267 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
 268 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
 269 BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
 270
 271 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 272 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 273 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
 274
 275 #define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
 276
 277 BTFIXUPDEF_INT(pte_modify_mask)
 278
 279 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 280 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 281 {
 282         return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 283                 pgprot_val(newprot));
 284 }
 285
 286 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 287
 288 /* to find an entry in a page-table-directory */
 289 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 290
 291 /* to find an entry in a kernel page-table-directory */
 292 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 293
 294 /* Find an entry in the second-level page table.. */
 295 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 296 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 297
 298 /* Find an entry in the third-level page table.. */
 299 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 300 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
 301
 302 /*
 303  * This shortcut works on sun4m (and sun4d) because the nocache area is static,
 304  * and sun4c is guaranteed to have no highmem anyway.
 305  */
 306 #define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 307 #define pte_offset_map_nested(d, a)     pte_offset_kernel(d,a)
 308
 309 #define pte_unmap(pte)          do{}while(0)
 310 #define pte_unmap_nested(pte)   do{}while(0)
 311
 312 /* Certain architectures need to do special things when pte's
 313  * within a page table are directly modified.  Thus, the following
 314  * hook is made available.
 315  */
 316
 317 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
 318
 319 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
 320 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 321
 322 struct seq_file;
 323 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
 324
 325 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
 326
 327 /* Fault handler stuff... */
 328 #define FAULT_CODE_PROT     0x1
 329 #define FAULT_CODE_WRITE    0x2
 330 #define FAULT_CODE_USER     0x4
 331
 332 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
 333
 334 #define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
 335
 336 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
 337     unsigned long, unsigned int)
 338 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
 339 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
 340 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
 341
 342 extern int invalid_segment;
 343
 344 /* Encode and de-code a swap entry */
 345 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
 346 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
 347 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
 348
 349 #define __swp_type(__x)                 BTFIXUP_CALL(__swp_type)(__x)
 350 #define __swp_offset(__x)               BTFIXUP_CALL(__swp_offset)(__x)
 351 #define __swp_entry(__type,__off)       BTFIXUP_CALL(__swp_entry)(__type,__off)
 352
 353 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 354 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 355
 356 /* file-offset-in-pte helpers */
 357 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
 358 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
 359
 360 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
 361 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
 362
 363 /*
 364  * This is made a constant because mm/fremap.c required a constant.
 365  * Note that layout of these bits is different between sun4c.c and srmmu.c.
 366  */
 367 #define PTE_FILE_MAX_BITS 24
 368
 369 /*
 370  */
 371 struct ctx_list {
 372         struct ctx_list *next;
 373         struct ctx_list *prev;
 374         unsigned int ctx_number;
 375         struct mm_struct *ctx_mm;
 376 };
 377
 378 extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 379 extern struct ctx_list ctx_free;        /* Head of free list */
 380 extern struct ctx_list ctx_used;        /* Head of used contexts list */
 381
 382 #define NO_CONTEXT     -1
 383
 384 static inline void remove_from_ctx_list(struct ctx_list *entry)
 385 {
 386         entry->next->prev = entry->prev;
 387         entry->prev->next = entry->next;
 388 }
 389
 390 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
 391 {
 392         entry->next = head;
 393         (entry->prev = head->prev)->next = entry;
 394         head->prev = entry;
 395 }
 396 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 397 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
 398
 399 static inline unsigned long
 400 __get_phys (unsigned long addr)
 401 {
 402         switch (sparc_cpu_model){
 403         case sun4:
 404         case sun4c:
 405                 return sun4c_get_pte (addr) << PAGE_SHIFT;
 406         case sun4m:
 407         case sun4d:
 408                 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 409         default:
 410                 return 0;
 411         }
 412 }
 413
 414 static inline int
 415 __get_iospace (unsigned long addr)
 416 {
 417         switch (sparc_cpu_model){
 418         case sun4:
 419         case sun4c:
 420                 return -1; /* Don't check iospace on sun4c */
 421         case sun4m:
 422         case sun4d:
 423                 return (srmmu_get_pte (addr) >> 28);
 424         default:
 425                 return -1;
 426         }
 427 }
 428
 429 extern unsigned long *sparc_valid_addr_bitmap;
 430
 431 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 432 #define kern_addr_valid(addr) \
 433         (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 434
 435 extern int io_remap_pfn_range(struct vm_area_struct *vma,
 436                               unsigned long from, unsigned long pfn,
 437                               unsigned long size, pgprot_t prot);
 438
 439 /*
 440  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 441  * its high 4 bits.  These macros/functions put it there or get it from there.
 442  */
 443 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 444 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 445 #define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 446
 447 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 448 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 449 ({                                                                        \
 450         int __changed = !pte_same(*(__ptep), __entry);                    \
 451         if (__changed) {                                                  \
 452                 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 453                 flush_tlb_page(__vma, __address);                         \
 454         }                                                                 \
 455         (sparc_cpu_model == sun4c) || __changed;                          \
 456 })
 457
 458 #include <asm-generic/pgtable.h>
 459
 460 #endif /* !(__ASSEMBLY__) */
 461
 462 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 463 #define HAVE_ARCH_UNMAPPED_AREA
 464
 465 /*
 466  * No page table caches to initialise
 467  */
 468 #define pgtable_cache_init()    do { } while (0)
 469
 470 #endif /* !(_SPARC_PGTABLE_H) */