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