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 #ifndef __ASSEMBLY__
  12 #include <asm-generic/4level-fixup.h>
  13
  14 #include <linux/spinlock.h>
  15 #include <linux/swap.h>
  16 #include <asm/types.h>
  17 #include <asm/pgtsun4c.h>
  18 #include <asm/pgtsrmmu.h>
  19 #include <asm/vac-ops.h>
  20 #include <asm/oplib.h>
  21 #include <asm/btfixup.h>
  22 #include <asm/system.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 BTFIXUPDEF_SIMM13(pgdir_shift)
  32 BTFIXUPDEF_SETHI(pgdir_size)
  33 BTFIXUPDEF_SETHI(pgdir_mask)
  34
  35 BTFIXUPDEF_SIMM13(ptrs_per_pmd)
  36 BTFIXUPDEF_SIMM13(ptrs_per_pgd)
  37 BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
  38
  39 #define pte_ERROR(e)   __builtin_trap()
  40 #define pmd_ERROR(e)   __builtin_trap()
  41 #define pgd_ERROR(e)   __builtin_trap()
  42
  43 BTFIXUPDEF_INT(page_none)
  44 BTFIXUPDEF_INT(page_copy)
  45 BTFIXUPDEF_INT(page_readonly)
  46 BTFIXUPDEF_INT(page_kernel)
  47
  48 #define PMD_SHIFT               SUN4C_PMD_SHIFT
  49 #define PMD_SIZE                (1UL << PMD_SHIFT)
  50 #define PMD_MASK                (~(PMD_SIZE-1))
  51 #define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
  52 #define PGDIR_SHIFT             BTFIXUP_SIMM13(pgdir_shift)
  53 #define PGDIR_SIZE              BTFIXUP_SETHI(pgdir_size)
  54 #define PGDIR_MASK              BTFIXUP_SETHI(pgdir_mask)
  55 #define PTRS_PER_PTE            1024
  56 #define PTRS_PER_PMD            BTFIXUP_SIMM13(ptrs_per_pmd)
  57 #define PTRS_PER_PGD            BTFIXUP_SIMM13(ptrs_per_pgd)
  58 #define USER_PTRS_PER_PGD       BTFIXUP_SIMM13(user_ptrs_per_pgd)
  59 #define FIRST_USER_ADDRESS      0
  60 #define PTE_SIZE                (PTRS_PER_PTE*4)
  61
  62 #define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))
  63 extern pgprot_t PAGE_SHARED;
  64 #define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))
  65 #define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly))
  66
  67 extern unsigned long page_kernel;
  68
  69 #ifdef MODULE
  70 #define PAGE_KERNEL     page_kernel
  71 #else
  72 #define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))
  73 #endif
  74
  75 /* Top-level page directory */
  76 extern pgd_t swapper_pg_dir[1024];
  77
  78 extern void paging_init(void);
  79
  80 /* Page table for 0-4MB for everybody, on the Sparc this
  81  * holds the same as on the i386.
  82  */
  83 extern pte_t pg0[1024];
  84 extern pte_t pg1[1024];
  85 extern pte_t pg2[1024];
  86 extern pte_t pg3[1024];
  87
  88 extern unsigned long ptr_in_current_pgd;
  89
  90 /* Here is a trick, since mmap.c need the initializer elements for
  91  * protection_map[] to be constant at compile time, I set the following
  92  * to all zeros.  I set it to the real values after I link in the
  93  * appropriate MMU page table routines at boot time.
  94  */
  95 #define __P000  __pgprot(0)
  96 #define __P001  __pgprot(0)
  97 #define __P010  __pgprot(0)
  98 #define __P011  __pgprot(0)
  99 #define __P100  __pgprot(0)
 100 #define __P101  __pgprot(0)
 101 #define __P110  __pgprot(0)
 102 #define __P111  __pgprot(0)
 103
 104 #define __S000  __pgprot(0)
 105 #define __S001  __pgprot(0)
 106 #define __S010  __pgprot(0)
 107 #define __S011  __pgprot(0)
 108 #define __S100  __pgprot(0)
 109 #define __S101  __pgprot(0)
 110 #define __S110  __pgprot(0)
 111 #define __S111  __pgprot(0)
 112
 113 extern int num_contexts;
 114
 115 /* First physical page can be anywhere, the following is needed so that
 116  * va-->pa and vice versa conversions work properly without performance
 117  * hit for all __pa()/__va() operations.
 118  */
 119 extern unsigned long phys_base;
 120 extern unsigned long pfn_base;
 121
 122 /*
 123  * BAD_PAGETABLE is used when we need a bogus page-table, while
 124  * BAD_PAGE is used for a bogus page.
 125  *
 126  * ZERO_PAGE is a global shared page that is always zero: used
 127  * for zero-mapped memory areas etc..
 128  */
 129 extern pte_t * __bad_pagetable(void);
 130 extern pte_t __bad_page(void);
 131 extern unsigned long empty_zero_page;
 132
 133 #define BAD_PAGETABLE __bad_pagetable()
 134 #define BAD_PAGE __bad_page()
 135 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
 136
 137 /*
 138  */
 139 BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
 140 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
 141
 142 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
 143 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
 144
 145 BTFIXUPDEF_SETHI(none_mask)
 146 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
 147 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
 148
 149 static inline int pte_none(pte_t pte)
 150 {
 151         return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
 152 }
 153
 154 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 155 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
 156
 157 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 158 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 159 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
 160
 161 static inline int pmd_none(pmd_t pmd)
 162 {
 163         return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
 164 }
 165
 166 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 167 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 168 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
 169
 170 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 171 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 172 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 173 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
 174
 175 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 176 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 177 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 178 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
 179
 180 /*
 181  * The following only work if pte_present() is true.
 182  * Undefined behaviour if not..
 183  */
 184 BTFIXUPDEF_HALF(pte_writei)
 185 BTFIXUPDEF_HALF(pte_dirtyi)
 186 BTFIXUPDEF_HALF(pte_youngi)
 187
 188 static int pte_write(pte_t pte) __attribute_const__;
 189 static inline int pte_write(pte_t pte)
 190 {
 191         return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 192 }
 193
 194 static int pte_dirty(pte_t pte) __attribute_const__;
 195 static inline int pte_dirty(pte_t pte)
 196 {
 197         return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 198 }
 199
 200 static int pte_young(pte_t pte) __attribute_const__;
 201 static inline int pte_young(pte_t pte)
 202 {
 203         return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 204 }
 205
 206 /*
 207  * The following only work if pte_present() is not true.
 208  */
 209 BTFIXUPDEF_HALF(pte_filei)
 210
 211 static int pte_file(pte_t pte) __attribute_const__;
 212 static inline int pte_file(pte_t pte)
 213 {
 214         return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 215 }
 216
 217 static inline int pte_special(pte_t pte)
 218 {
 219         return 0;
 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 pte_mkspecial(pte)    (pte)
 255
 256 #define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
 257
 258 BTFIXUPDEF_CALL(unsigned long,   pte_pfn, pte_t)
 259 #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
 260 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 261
 262 /*
 263  * Conversion functions: convert a page and protection to a page entry,
 264  * and a page entry and page directory to the page they refer to.
 265  */
 266 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
 267
 268 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
 269 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
 270 BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
 271
 272 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 273 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 274 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
 275
 276 #define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
 277
 278 BTFIXUPDEF_INT(pte_modify_mask)
 279
 280 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 281 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 282 {
 283         return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 284                 pgprot_val(newprot));
 285 }
 286
 287 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 288
 289 /* to find an entry in a page-table-directory */
 290 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 291
 292 /* to find an entry in a kernel page-table-directory */
 293 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 294
 295 /* Find an entry in the second-level page table.. */
 296 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 297 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 298
 299 /* Find an entry in the third-level page table.. */
 300 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 301 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
 302
 303 /*
 304  * This shortcut works on sun4m (and sun4d) because the nocache area is static,
 305  * and sun4c is guaranteed to have no highmem anyway.
 306  */
 307 #define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 308 #define pte_offset_map_nested(d, a)     pte_offset_kernel(d,a)
 309
 310 #define pte_unmap(pte)          do{}while(0)
 311 #define pte_unmap_nested(pte)   do{}while(0)
 312
 313 /* Certain architectures need to do special things when pte's
 314  * within a page table are directly modified.  Thus, the following
 315  * hook is made available.
 316  */
 317
 318 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
 319
 320 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
 321 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 322
 323 struct seq_file;
 324 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
 325
 326 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
 327
 328 /* Fault handler stuff... */
 329 #define FAULT_CODE_PROT     0x1
 330 #define FAULT_CODE_WRITE    0x2
 331 #define FAULT_CODE_USER     0x4
 332
 333 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *)
 334
 335 #define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
 336
 337 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
 338     unsigned long, unsigned int)
 339 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
 340 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
 341 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
 342
 343 extern int invalid_segment;
 344
 345 /* Encode and de-code a swap entry */
 346 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
 347 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
 348 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
 349
 350 #define __swp_type(__x)                 BTFIXUP_CALL(__swp_type)(__x)
 351 #define __swp_offset(__x)               BTFIXUP_CALL(__swp_offset)(__x)
 352 #define __swp_entry(__type,__off)       BTFIXUP_CALL(__swp_entry)(__type,__off)
 353
 354 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 355 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 356
 357 /* file-offset-in-pte helpers */
 358 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
 359 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
 360
 361 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
 362 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
 363
 364 /*
 365  * This is made a constant because mm/fremap.c required a constant.
 366  * Note that layout of these bits is different between sun4c.c and srmmu.c.
 367  */
 368 #define PTE_FILE_MAX_BITS 24
 369
 370 /*
 371  */
 372 struct ctx_list {
 373         struct ctx_list *next;
 374         struct ctx_list *prev;
 375         unsigned int ctx_number;
 376         struct mm_struct *ctx_mm;
 377 };
 378
 379 extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 380 extern struct ctx_list ctx_free;        /* Head of free list */
 381 extern struct ctx_list ctx_used;        /* Head of used contexts list */
 382
 383 #define NO_CONTEXT     -1
 384
 385 static inline void remove_from_ctx_list(struct ctx_list *entry)
 386 {
 387         entry->next->prev = entry->prev;
 388         entry->prev->next = entry->next;
 389 }
 390
 391 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
 392 {
 393         entry->next = head;
 394         (entry->prev = head->prev)->next = entry;
 395         head->prev = entry;
 396 }
 397 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 398 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
 399
 400 static inline unsigned long
 401 __get_phys (unsigned long addr)
 402 {
 403         switch (sparc_cpu_model){
 404         case sun4:
 405         case sun4c:
 406                 return sun4c_get_pte (addr) << PAGE_SHIFT;
 407         case sun4m:
 408         case sun4d:
 409                 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 410         default:
 411                 return 0;
 412         }
 413 }
 414
 415 static inline int
 416 __get_iospace (unsigned long addr)
 417 {
 418         switch (sparc_cpu_model){
 419         case sun4:
 420         case sun4c:
 421                 return -1; /* Don't check iospace on sun4c */
 422         case sun4m:
 423         case sun4d:
 424                 return (srmmu_get_pte (addr) >> 28);
 425         default:
 426                 return -1;
 427         }
 428 }
 429
 430 extern unsigned long *sparc_valid_addr_bitmap;
 431
 432 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 433 #define kern_addr_valid(addr) \
 434         (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 435
 436 extern int io_remap_pfn_range(struct vm_area_struct *vma,
 437                               unsigned long from, unsigned long pfn,
 438                               unsigned long size, pgprot_t prot);
 439
 440 /*
 441  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 442  * its high 4 bits.  These macros/functions put it there or get it from there.
 443  */
 444 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 445 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 446 #define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 447
 448 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 449 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 450 ({                                                                        \
 451         int __changed = !pte_same(*(__ptep), __entry);                    \
 452         if (__changed) {                                                  \
 453                 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 454                 flush_tlb_page(__vma, __address);                         \
 455         }                                                                 \
 456         (sparc_cpu_model == sun4c) || __changed;                          \
 457 })
 458
 459 #include <asm-generic/pgtable.h>
 460
 461 #endif /* !(__ASSEMBLY__) */
 462
 463 #define VMALLOC_START           0xfe600000
 464 /* XXX Alter this when I get around to fixing sun4c - Anton */
 465 #define VMALLOC_END             0xffc00000
 466
 467
 468 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 469 #define HAVE_ARCH_UNMAPPED_AREA
 470
 471 /*
 472  * No page table caches to initialise
 473  */
 474 #define pgtable_cache_init()    do { } while (0)
 475
 476 #endif /* !(_SPARC_PGTABLE_H) */