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/pgtsrmmu.h>
  20 #include <asm/oplib.h>
  21 #include <asm/btfixup.h>
  22 #include <asm/cpu_type.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               22
  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_CALL_CONST(int, pte_present, pte_t)
 146 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
 147
 148 static inline int pte_none(pte_t pte)
 149 {
 150         return !pte_val(pte);
 151 }
 152
 153 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 154 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
 155
 156 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 157 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 158 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
 159
 160 static inline int pmd_none(pmd_t pmd)
 161 {
 162         return !pmd_val(pmd);
 163 }
 164
 165 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 166 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 167 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
 168
 169 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 170 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 171 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 172 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
 173
 174 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 175 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 176 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 177 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
 178
 179 /*
 180  * The following only work if pte_present() is true.
 181  * Undefined behaviour if not..
 182  */
 183 BTFIXUPDEF_HALF(pte_writei)
 184 BTFIXUPDEF_HALF(pte_dirtyi)
 185 BTFIXUPDEF_HALF(pte_youngi)
 186
 187 static int pte_write(pte_t pte) __attribute_const__;
 188 static inline int pte_write(pte_t pte)
 189 {
 190         return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 191 }
 192
 193 static int pte_dirty(pte_t pte) __attribute_const__;
 194 static inline int pte_dirty(pte_t pte)
 195 {
 196         return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 197 }
 198
 199 static int pte_young(pte_t pte) __attribute_const__;
 200 static inline int pte_young(pte_t pte)
 201 {
 202         return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 203 }
 204
 205 /*
 206  * The following only work if pte_present() is not true.
 207  */
 208 BTFIXUPDEF_HALF(pte_filei)
 209
 210 static int pte_file(pte_t pte) __attribute_const__;
 211 static inline int pte_file(pte_t pte)
 212 {
 213         return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 214 }
 215
 216 static inline int pte_special(pte_t pte)
 217 {
 218         return 0;
 219 }
 220
 221 /*
 222  */
 223 BTFIXUPDEF_HALF(pte_wrprotecti)
 224 BTFIXUPDEF_HALF(pte_mkcleani)
 225 BTFIXUPDEF_HALF(pte_mkoldi)
 226
 227 static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
 228 static inline pte_t pte_wrprotect(pte_t pte)
 229 {
 230         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
 231 }
 232
 233 static pte_t pte_mkclean(pte_t pte) __attribute_const__;
 234 static inline pte_t pte_mkclean(pte_t pte)
 235 {
 236         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
 237 }
 238
 239 static pte_t pte_mkold(pte_t pte) __attribute_const__;
 240 static inline pte_t pte_mkold(pte_t pte)
 241 {
 242         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
 243 }
 244
 245 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
 246 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
 247 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
 248
 249 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
 250 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
 251 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
 252
 253 #define pte_mkspecial(pte)    (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
 270 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 271 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 272 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
 273
 274 #define pgprot_noncached pgprot_noncached
 275 static inline pgprot_t pgprot_noncached(pgprot_t prot)
 276 {
 277         prot &= ~__pgprot(SRMMU_CACHE);
 278         return prot;
 279 }
 280
 281 BTFIXUPDEF_INT(pte_modify_mask)
 282
 283 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 284 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 285 {
 286         return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 287                 pgprot_val(newprot));
 288 }
 289
 290 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 291
 292 /* to find an entry in a page-table-directory */
 293 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 294
 295 /* to find an entry in a kernel page-table-directory */
 296 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 297
 298 /* Find an entry in the second-level page table.. */
 299 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 300 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 301
 302 /* Find an entry in the third-level page table.. */
 303 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 304 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
 305
 306 /*
 307  * This shortcut works on sun4m (and sun4d) because the nocache area is static.
 308  */
 309 #define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 310 #define pte_unmap(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,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
 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 static inline unsigned long pte_to_pgoff(pte_t pte)
 358 {
 359         return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT;
 360 }
 361
 362 static inline pte_t pgoff_to_pte(unsigned long pgoff)
 363 {
 364         return __pte((pgoff << SRMMU_PTE_FILE_SHIFT) | SRMMU_FILE);
 365 }
 366
 367 /*
 368  * This is made a constant because mm/fremap.c required a constant.
 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 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 sun4m:
 419         case sun4d:
 420                 return (srmmu_get_pte (addr) >> 28);
 421         default:
 422                 return -1;
 423         }
 424 }
 425
 426 extern unsigned long *sparc_valid_addr_bitmap;
 427
 428 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 429 #define kern_addr_valid(addr) \
 430         (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 431
 432 /*
 433  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 434  * its high 4 bits.  These macros/functions put it there or get it from there.
 435  */
 436 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 437 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 438 #define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 439
 440 extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
 441                            unsigned long, pgprot_t);
 442
 443 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 444                                      unsigned long from, unsigned long pfn,
 445                                      unsigned long size, pgprot_t prot)
 446 {
 447         unsigned long long offset, space, phys_base;
 448
 449         offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
 450         space = GET_IOSPACE(pfn);
 451         phys_base = offset | (space << 32ULL);
 452
 453         return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
 454 }
 455
 456 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 457 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 458 ({                                                                        \
 459         int __changed = !pte_same(*(__ptep), __entry);                    \
 460         if (__changed) {                                                  \
 461                 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 462                 flush_tlb_page(__vma, __address);                         \
 463         }                                                                 \
 464         __changed;                                                        \
 465 })
 466
 467 #include <asm-generic/pgtable.h>
 468
 469 #endif /* !(__ASSEMBLY__) */
 470
 471 #define VMALLOC_START           _AC(0xfe600000,UL)
 472 #define VMALLOC_END             _AC(0xffc00000,UL)
 473
 474 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 475 #define HAVE_ARCH_UNMAPPED_AREA
 476
 477 /*
 478  * No page table caches to initialise
 479  */
 480 #define pgtable_cache_init()    do { } while (0)
 481
 482 #endif /* !(_SPARC_PGTABLE_H) */