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/pgtsun4c.h>
  20 #include <asm/pgtsrmmu.h>
  21 #include <asm/vac-ops.h>
  22 #include <asm/oplib.h>
  23 #include <asm/btfixup.h>
  24 #include <asm/system.h>
  25
  26
  27 struct vm_area_struct;
  28 struct page;
  29
  30 extern void load_mmu(void);
  31 extern unsigned long calc_highpages(void);
  32
  33 BTFIXUPDEF_SIMM13(pgdir_shift)
  34 BTFIXUPDEF_SETHI(pgdir_size)
  35 BTFIXUPDEF_SETHI(pgdir_mask)
  36
  37 BTFIXUPDEF_SIMM13(ptrs_per_pmd)
  38 BTFIXUPDEF_SIMM13(ptrs_per_pgd)
  39 BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
  40
  41 #define pte_ERROR(e)   __builtin_trap()
  42 #define pmd_ERROR(e)   __builtin_trap()
  43 #define pgd_ERROR(e)   __builtin_trap()
  44
  45 BTFIXUPDEF_INT(page_none)
  46 BTFIXUPDEF_INT(page_copy)
  47 BTFIXUPDEF_INT(page_readonly)
  48 BTFIXUPDEF_INT(page_kernel)
  49
  50 #define PMD_SHIFT               SUN4C_PMD_SHIFT
  51 #define PMD_SIZE                (1UL << PMD_SHIFT)
  52 #define PMD_MASK                (~(PMD_SIZE-1))
  53 #define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
  54 #define PGDIR_SHIFT             BTFIXUP_SIMM13(pgdir_shift)
  55 #define PGDIR_SIZE              BTFIXUP_SETHI(pgdir_size)
  56 #define PGDIR_MASK              BTFIXUP_SETHI(pgdir_mask)
  57 #define PTRS_PER_PTE            1024
  58 #define PTRS_PER_PMD            BTFIXUP_SIMM13(ptrs_per_pmd)
  59 #define PTRS_PER_PGD            BTFIXUP_SIMM13(ptrs_per_pgd)
  60 #define USER_PTRS_PER_PGD       BTFIXUP_SIMM13(user_ptrs_per_pgd)
  61 #define FIRST_USER_ADDRESS      0
  62 #define PTE_SIZE                (PTRS_PER_PTE*4)
  63
  64 #define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))
  65 extern pgprot_t PAGE_SHARED;
  66 #define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))
  67 #define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly))
  68
  69 extern unsigned long page_kernel;
  70
  71 #ifdef MODULE
  72 #define PAGE_KERNEL     page_kernel
  73 #else
  74 #define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))
  75 #endif
  76
  77 /* Top-level page directory */
  78 extern pgd_t swapper_pg_dir[1024];
  79
  80 extern void paging_init(void);
  81
  82 /* Page table for 0-4MB for everybody, on the Sparc this
  83  * holds the same as on the i386.
  84  */
  85 extern pte_t pg0[1024];
  86 extern pte_t pg1[1024];
  87 extern pte_t pg2[1024];
  88 extern pte_t pg3[1024];
  89
  90 extern unsigned long ptr_in_current_pgd;
  91
  92 /* Here is a trick, since mmap.c need the initializer elements for
  93  * protection_map[] to be constant at compile time, I set the following
  94  * to all zeros.  I set it to the real values after I link in the
  95  * appropriate MMU page table routines at boot time.
  96  */
  97 #define __P000  __pgprot(0)
  98 #define __P001  __pgprot(0)
  99 #define __P010  __pgprot(0)
 100 #define __P011  __pgprot(0)
 101 #define __P100  __pgprot(0)
 102 #define __P101  __pgprot(0)
 103 #define __P110  __pgprot(0)
 104 #define __P111  __pgprot(0)
 105
 106 #define __S000  __pgprot(0)
 107 #define __S001  __pgprot(0)
 108 #define __S010  __pgprot(0)
 109 #define __S011  __pgprot(0)
 110 #define __S100  __pgprot(0)
 111 #define __S101  __pgprot(0)
 112 #define __S110  __pgprot(0)
 113 #define __S111  __pgprot(0)
 114
 115 extern int num_contexts;
 116
 117 /* First physical page can be anywhere, the following is needed so that
 118  * va-->pa and vice versa conversions work properly without performance
 119  * hit for all __pa()/__va() operations.
 120  */
 121 extern unsigned long phys_base;
 122 extern unsigned long pfn_base;
 123
 124 /*
 125  * BAD_PAGETABLE is used when we need a bogus page-table, while
 126  * BAD_PAGE is used for a bogus page.
 127  *
 128  * ZERO_PAGE is a global shared page that is always zero: used
 129  * for zero-mapped memory areas etc..
 130  */
 131 extern pte_t * __bad_pagetable(void);
 132 extern pte_t __bad_page(void);
 133 extern unsigned long empty_zero_page;
 134
 135 #define BAD_PAGETABLE __bad_pagetable()
 136 #define BAD_PAGE __bad_page()
 137 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
 138
 139 /*
 140  */
 141 BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
 142 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
 143
 144 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
 145 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
 146
 147 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
 148 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
 149
 150 static inline int pte_none(pte_t pte)
 151 {
 152         return !pte_val(pte);
 153 }
 154
 155 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 156 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
 157
 158 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 159 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 160 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
 161
 162 static inline int pmd_none(pmd_t pmd)
 163 {
 164         return !pmd_val(pmd);
 165 }
 166
 167 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 168 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 169 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
 170
 171 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 172 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 173 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 174 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
 175
 176 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 177 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 178 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 179 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
 180
 181 /*
 182  * The following only work if pte_present() is true.
 183  * Undefined behaviour if not..
 184  */
 185 BTFIXUPDEF_HALF(pte_writei)
 186 BTFIXUPDEF_HALF(pte_dirtyi)
 187 BTFIXUPDEF_HALF(pte_youngi)
 188
 189 static int pte_write(pte_t pte) __attribute_const__;
 190 static inline int pte_write(pte_t pte)
 191 {
 192         return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 193 }
 194
 195 static int pte_dirty(pte_t pte) __attribute_const__;
 196 static inline int pte_dirty(pte_t pte)
 197 {
 198         return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 199 }
 200
 201 static int pte_young(pte_t pte) __attribute_const__;
 202 static inline int pte_young(pte_t pte)
 203 {
 204         return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 205 }
 206
 207 /*
 208  * The following only work if pte_present() is not true.
 209  */
 210 BTFIXUPDEF_HALF(pte_filei)
 211
 212 static int pte_file(pte_t pte) __attribute_const__;
 213 static inline int pte_file(pte_t pte)
 214 {
 215         return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 216 }
 217
 218 static inline int pte_special(pte_t pte)
 219 {
 220         return 0;
 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 pte_mkspecial(pte)    (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_unmap(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,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
 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 /*
 435  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 436  * its high 4 bits.  These macros/functions put it there or get it from there.
 437  */
 438 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 439 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 440 #define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 441
 442 extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
 443                            unsigned long, pgprot_t);
 444
 445 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 446                                      unsigned long from, unsigned long pfn,
 447                                      unsigned long size, pgprot_t prot)
 448 {
 449         unsigned long long offset, space, phys_base;
 450
 451         offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
 452         space = GET_IOSPACE(pfn);
 453         phys_base = offset | (space << 32ULL);
 454
 455         return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
 456 }
 457
 458 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 459 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 460 ({                                                                        \
 461         int __changed = !pte_same(*(__ptep), __entry);                    \
 462         if (__changed) {                                                  \
 463                 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 464                 flush_tlb_page(__vma, __address);                         \
 465         }                                                                 \
 466         (sparc_cpu_model == sun4c) || __changed;                          \
 467 })
 468
 469 #include <asm-generic/pgtable.h>
 470
 471 #endif /* !(__ASSEMBLY__) */
 472
 473 #define VMALLOC_START           _AC(0xfe600000,UL)
 474 /* XXX Alter this when I get around to fixing sun4c - Anton */
 475 #define VMALLOC_END             _AC(0xffc00000,UL)
 476
 477
 478 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 479 #define HAVE_ARCH_UNMAPPED_AREA
 480
 481 /*
 482  * No page table caches to initialise
 483  */
 484 #define pgtable_cache_init()    do { } while (0)
 485
 486 #endif /* !(_SPARC_PGTABLE_H) */