include/asm-sparc/pgtable.h

   1 /* $Id: pgtable.h,v 1.106 2000/11/08 04:49:24 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 <linux/config.h>
  13 #include <linux/spinlock.h>
  14 #include <asm/asi.h>
  15 #ifdef CONFIG_SUN4
  16 #include <asm/pgtsun4.h>
  17 #else
  18 #include <asm/pgtsun4c.h>
  19 #endif
  20 #include <asm/pgtsrmmu.h>
  21 #include <asm/vac-ops.h>
  22 #include <asm/oplib.h>
  23 #include <asm/sbus.h>
  24 #include <asm/btfixup.h>
  25 #include <asm/system.h>
  26
  27 #ifndef __ASSEMBLY__
  28
  29 extern void load_mmu(void);
  30
  31 BTFIXUPDEF_CALL(void, quick_kernel_fault, unsigned long)
  32
  33 #define quick_kernel_fault(addr) BTFIXUP_CALL(quick_kernel_fault)(addr)
  34
  35 /* Routines for data transfer buffers. */
  36 BTFIXUPDEF_CALL(char *, mmu_lockarea, char *, unsigned long)
  37 BTFIXUPDEF_CALL(void,   mmu_unlockarea, char *, unsigned long)
  38
  39 #define mmu_lockarea(vaddr,len) BTFIXUP_CALL(mmu_lockarea)(vaddr,len)
  40 #define mmu_unlockarea(vaddr,len) BTFIXUP_CALL(mmu_unlockarea)(vaddr,len)
  41
  42 /* These are implementations for sbus_map_sg/sbus_unmap_sg... collapse later */
  43 BTFIXUPDEF_CALL(__u32, mmu_get_scsi_one, char *, unsigned long, struct sbus_bus *sbus)
  44 BTFIXUPDEF_CALL(void,  mmu_get_scsi_sgl, struct scatterlist *, int, struct sbus_bus *sbus)
  45 BTFIXUPDEF_CALL(void,  mmu_release_scsi_one, __u32, unsigned long, struct sbus_bus *sbus)
  46 BTFIXUPDEF_CALL(void,  mmu_release_scsi_sgl, struct scatterlist *, int, struct sbus_bus *sbus)
  47
  48 #define mmu_get_scsi_one(vaddr,len,sbus) BTFIXUP_CALL(mmu_get_scsi_one)(vaddr,len,sbus)
  49 #define mmu_get_scsi_sgl(sg,sz,sbus) BTFIXUP_CALL(mmu_get_scsi_sgl)(sg,sz,sbus)
  50 #define mmu_release_scsi_one(vaddr,len,sbus) BTFIXUP_CALL(mmu_release_scsi_one)(vaddr,len,sbus)
  51 #define mmu_release_scsi_sgl(sg,sz,sbus) BTFIXUP_CALL(mmu_release_scsi_sgl)(sg,sz,sbus)
  52
  53 /*
  54  * mmu_map/unmap are provided by iommu/iounit; Invalid to call on IIep.
  55  */
  56 BTFIXUPDEF_CALL(void,  mmu_map_dma_area, unsigned long va, __u32 addr, int len)
  57 BTFIXUPDEF_CALL(unsigned long /*phys*/, mmu_translate_dvma, unsigned long busa)
  58 BTFIXUPDEF_CALL(void,  mmu_unmap_dma_area, unsigned long busa, int len)
  59
  60 #define mmu_map_dma_area(va, ba,len) BTFIXUP_CALL(mmu_map_dma_area)(va,ba,len)
  61 #define mmu_unmap_dma_area(ba,len) BTFIXUP_CALL(mmu_unmap_dma_area)(ba,len)
  62 #define mmu_translate_dvma(ba)     BTFIXUP_CALL(mmu_translate_dvma)(ba)
  63
  64 BTFIXUPDEF_SIMM13(pmd_shift)
  65 BTFIXUPDEF_SETHI(pmd_size)
  66 BTFIXUPDEF_SETHI(pmd_mask)
  67
  68 extern unsigned int pmd_align(unsigned int addr) __attribute__((const));
  69 extern __inline__ unsigned int pmd_align(unsigned int addr)
  70 {
  71         return ((addr + ~BTFIXUP_SETHI(pmd_mask)) & BTFIXUP_SETHI(pmd_mask));
  72 }
  73
  74 BTFIXUPDEF_SIMM13(pgdir_shift)
  75 BTFIXUPDEF_SETHI(pgdir_size)
  76 BTFIXUPDEF_SETHI(pgdir_mask)
  77
  78 extern unsigned int pgdir_align(unsigned int addr) __attribute__((const));
  79 extern __inline__ unsigned int pgdir_align(unsigned int addr)
  80 {
  81         return ((addr + ~BTFIXUP_SETHI(pgdir_mask)) & BTFIXUP_SETHI(pgdir_mask));
  82 }
  83
  84 BTFIXUPDEF_SIMM13(ptrs_per_pte)
  85 BTFIXUPDEF_SIMM13(ptrs_per_pmd)
  86 BTFIXUPDEF_SIMM13(ptrs_per_pgd)
  87 BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
  88
  89 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
  90
  91 #define pte_ERROR(e)   __builtin_trap()
  92 #define pmd_ERROR(e)   __builtin_trap()
  93 #define pgd_ERROR(e)   __builtin_trap()
  94
  95 BTFIXUPDEF_INT(page_none)
  96 BTFIXUPDEF_INT(page_shared)
  97 BTFIXUPDEF_INT(page_copy)
  98 BTFIXUPDEF_INT(page_readonly)
  99 BTFIXUPDEF_INT(page_kernel)
 100
 101 #define PMD_SHIFT               BTFIXUP_SIMM13(pmd_shift)
 102 #define PMD_SIZE                BTFIXUP_SETHI(pmd_size)
 103 #define PMD_MASK                BTFIXUP_SETHI(pmd_mask)
 104 #define PMD_ALIGN(addr)         pmd_align(addr)
 105 #define PGDIR_SHIFT             BTFIXUP_SIMM13(pgdir_shift)
 106 #define PGDIR_SIZE              BTFIXUP_SETHI(pgdir_size)
 107 #define PGDIR_MASK              BTFIXUP_SETHI(pgdir_mask)
 108 #define PGDIR_ALIGN             pgdir_align(addr)
 109 #define PTRS_PER_PTE            BTFIXUP_SIMM13(ptrs_per_pte)
 110 #define PTRS_PER_PMD            BTFIXUP_SIMM13(ptrs_per_pmd)
 111 #define PTRS_PER_PGD            BTFIXUP_SIMM13(ptrs_per_pgd)
 112 #define USER_PTRS_PER_PGD       BTFIXUP_SIMM13(user_ptrs_per_pgd)
 113 #define FIRST_USER_PGD_NR       0
 114
 115 #define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))
 116 #define PAGE_SHARED    __pgprot(BTFIXUP_INT(page_shared))
 117 #define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))
 118 #define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly))
 119
 120 extern unsigned long page_kernel;
 121
 122 #ifdef MODULE
 123 #define PAGE_KERNEL     page_kernel
 124 #else
 125 #define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))
 126 #endif
 127
 128 /* Top-level page directory */
 129 extern pgd_t swapper_pg_dir[1024];
 130
 131 /* Page table for 0-4MB for everybody, on the Sparc this
 132  * holds the same as on the i386.
 133  */
 134 extern pte_t pg0[1024];
 135 extern pte_t pg1[1024];
 136 extern pte_t pg2[1024];
 137 extern pte_t pg3[1024];
 138
 139 extern unsigned long ptr_in_current_pgd;
 140
 141 /* Here is a trick, since mmap.c need the initializer elements for
 142  * protection_map[] to be constant at compile time, I set the following
 143  * to all zeros.  I set it to the real values after I link in the
 144  * appropriate MMU page table routines at boot time.
 145  */
 146 #define __P000  __pgprot(0)
 147 #define __P001  __pgprot(0)
 148 #define __P010  __pgprot(0)
 149 #define __P011  __pgprot(0)
 150 #define __P100  __pgprot(0)
 151 #define __P101  __pgprot(0)
 152 #define __P110  __pgprot(0)
 153 #define __P111  __pgprot(0)
 154
 155 #define __S000  __pgprot(0)
 156 #define __S001  __pgprot(0)
 157 #define __S010  __pgprot(0)
 158 #define __S011  __pgprot(0)
 159 #define __S100  __pgprot(0)
 160 #define __S101  __pgprot(0)
 161 #define __S110  __pgprot(0)
 162 #define __S111  __pgprot(0)
 163
 164 extern int num_contexts;
 165
 166 /* First physical page can be anywhere, the following is needed so that
 167  * va-->pa and vice versa conversions work properly without performance
 168  * hit for all __pa()/__va() operations.
 169  */
 170 extern unsigned long phys_base;
 171
 172 /*
 173  * BAD_PAGETABLE is used when we need a bogus page-table, while
 174  * BAD_PAGE is used for a bogus page.
 175  *
 176  * ZERO_PAGE is a global shared page that is always zero: used
 177  * for zero-mapped memory areas etc..
 178  */
 179 extern pte_t * __bad_pagetable(void);
 180 extern pte_t __bad_page(void);
 181 extern unsigned long empty_zero_page;
 182
 183 #define BAD_PAGETABLE __bad_pagetable()
 184 #define BAD_PAGE __bad_page()
 185 #define ZERO_PAGE(vaddr) (mem_map + (((unsigned long)&empty_zero_page - PAGE_OFFSET + phys_base) >> PAGE_SHIFT))
 186
 187 /* number of bits that fit into a memory pointer */
 188 #define BITS_PER_PTR      (8*sizeof(unsigned long))
 189
 190 /* to align the pointer to a pointer address */
 191 #define PTR_MASK          (~(sizeof(void*)-1))
 192
 193 #define SIZEOF_PTR_LOG2   2
 194
 195 BTFIXUPDEF_CALL_CONST(unsigned long, pmd_page, pmd_t)
 196 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page, pgd_t)
 197
 198 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
 199 #define pgd_page(pgd) BTFIXUP_CALL(pgd_page)(pgd)
 200
 201 BTFIXUPDEF_SETHI(none_mask)
 202 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
 203 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
 204
 205 extern __inline__ int pte_none(pte_t pte)
 206 {
 207         return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
 208 }
 209
 210 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 211 #define pte_clear(pte) BTFIXUP_CALL(pte_clear)(pte)
 212
 213 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 214 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 215 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
 216
 217 extern __inline__ int pmd_none(pmd_t pmd)
 218 {
 219         return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
 220 }
 221
 222 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 223 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 224 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
 225
 226 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 227 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 228 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 229 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
 230
 231 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 232 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 233 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 234 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
 235
 236 /*
 237  * The following only work if pte_present() is true.
 238  * Undefined behaviour if not..
 239  */
 240 BTFIXUPDEF_HALF(pte_writei)
 241 BTFIXUPDEF_HALF(pte_dirtyi)
 242 BTFIXUPDEF_HALF(pte_youngi)
 243
 244 extern int pte_write(pte_t pte) __attribute__((const));
 245 extern __inline__ int pte_write(pte_t pte)
 246 {
 247         return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 248 }
 249
 250 extern int pte_dirty(pte_t pte) __attribute__((const));
 251 extern __inline__ int pte_dirty(pte_t pte)
 252 {
 253         return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 254 }
 255
 256 extern int pte_young(pte_t pte) __attribute__((const));
 257 extern __inline__ int pte_young(pte_t pte)
 258 {
 259         return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 260 }
 261
 262 BTFIXUPDEF_HALF(pte_wrprotecti)
 263 BTFIXUPDEF_HALF(pte_mkcleani)
 264 BTFIXUPDEF_HALF(pte_mkoldi)
 265
 266 extern pte_t pte_wrprotect(pte_t pte) __attribute__((const));
 267 extern __inline__ pte_t pte_wrprotect(pte_t pte)
 268 {
 269         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
 270 }
 271
 272 extern pte_t pte_mkclean(pte_t pte) __attribute__((const));
 273 extern __inline__ pte_t pte_mkclean(pte_t pte)
 274 {
 275         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
 276 }
 277
 278 extern pte_t pte_mkold(pte_t pte) __attribute__((const));
 279 extern __inline__ pte_t pte_mkold(pte_t pte)
 280 {
 281         return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
 282 }
 283
 284 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
 285 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
 286 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
 287
 288 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
 289 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
 290 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
 291
 292 #define page_pte_prot(page, prot)       mk_pte(page, prot)
 293 #define page_pte(page)                  page_pte_prot(page, __pgprot(0))
 294
 295 /* Permanent address of a page. */
 296 #define page_address(page)  ((page)->virtual)
 297
 298 BTFIXUPDEF_CALL(struct page *, pte_page, pte_t)
 299 #define pte_page(pte) BTFIXUP_CALL(pte_page)(pte)
 300
 301 /*
 302  * Conversion functions: convert a page and protection to a page entry,
 303  * and a page entry and page directory to the page they refer to.
 304  */
 305 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
 306
 307 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
 308 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
 309
 310 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 311 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 312 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
 313
 314 BTFIXUPDEF_CALL(void, pgd_set, pgd_t *, pmd_t *)
 315 BTFIXUPDEF_CALL(void, pmd_set, pmd_t *, pte_t *)
 316
 317 #define pgd_set(pgdp,pmdp) BTFIXUP_CALL(pgd_set)(pgdp,pmdp)
 318 #define pmd_set(pmdp,ptep) BTFIXUP_CALL(pmd_set)(pmdp,ptep)
 319
 320 BTFIXUPDEF_INT(pte_modify_mask)
 321
 322 extern pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute__((const));
 323 extern __inline__ pte_t pte_modify(pte_t pte, pgprot_t newprot)
 324 {
 325         return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 326                 pgprot_val(newprot));
 327 }
 328
 329 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 330
 331 /* to find an entry in a page-table-directory */
 332 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 333
 334 /* to find an entry in a kernel page-table-directory */
 335 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 336
 337 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 338 BTFIXUPDEF_CALL(pte_t *, pte_offset, pmd_t *, unsigned long)
 339
 340 /* Find an entry in the second-level page table.. */
 341 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
 342
 343 /* Find an entry in the third-level page table.. */
 344 #define pte_offset(dir,addr) BTFIXUP_CALL(pte_offset)(dir,addr)
 345
 346 /* The permissions for pgprot_val to make a page mapped on the obio space */
 347 extern unsigned int pg_iobits;
 348
 349 #define flush_icache_page(vma, pg)      do { } while(0)
 350
 351 /* Certain architectures need to do special things when pte's
 352  * within a page table are directly modified.  Thus, the following
 353  * hook is made available.
 354  */
 355
 356 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
 357
 358 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
 359
 360 BTFIXUPDEF_CALL(int, mmu_info, char *)
 361
 362 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
 363
 364 /* Fault handler stuff... */
 365 #define FAULT_CODE_PROT     0x1
 366 #define FAULT_CODE_WRITE    0x2
 367 #define FAULT_CODE_USER     0x4
 368
 369 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
 370
 371 #define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
 372
 373 extern int invalid_segment;
 374
 375 /* Encode and de-code a swap entry */
 376 #define SWP_TYPE(x)                     (((x).val >> 2) & 0x7f)
 377 #define SWP_OFFSET(x)                   (((x).val >> 9) & 0x3ffff)
 378 #define SWP_ENTRY(type,offset)          ((swp_entry_t) { (((type) & 0x7f) << 2) | (((offset) & 0x3ffff) << 9) })
 379 #define pte_to_swp_entry(pte)           ((swp_entry_t) { pte_val(pte) })
 380 #define swp_entry_to_pte(x)             ((pte_t) { (x).val })
 381
 382 struct ctx_list {
 383         struct ctx_list *next;
 384         struct ctx_list *prev;
 385         unsigned int ctx_number;
 386         struct mm_struct *ctx_mm;
 387 };
 388
 389 extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 390 extern struct ctx_list ctx_free;        /* Head of free list */
 391 extern struct ctx_list ctx_used;        /* Head of used contexts list */
 392
 393 #define NO_CONTEXT     -1
 394
 395 extern __inline__ void remove_from_ctx_list(struct ctx_list *entry)
 396 {
 397         entry->next->prev = entry->prev;
 398         entry->prev->next = entry->next;
 399 }
 400
 401 extern __inline__ void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
 402 {
 403         entry->next = head;
 404         (entry->prev = head->prev)->next = entry;
 405         head->prev = entry;
 406 }
 407 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 408 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
 409
 410 extern __inline__ unsigned long
 411 __get_phys (unsigned long addr)
 412 {
 413         switch (sparc_cpu_model){
 414         case sun4:
 415         case sun4c:
 416                 return sun4c_get_pte (addr) << PAGE_SHIFT;
 417         case sun4m:
 418         case sun4d:
 419                 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 420         default:
 421                 return 0;
 422         }
 423 }
 424
 425 extern __inline__ int
 426 __get_iospace (unsigned long addr)
 427 {
 428         switch (sparc_cpu_model){
 429         case sun4:
 430         case sun4c:
 431                 return -1; /* Don't check iospace on sun4c */
 432         case sun4m:
 433         case sun4d:
 434                 return (srmmu_get_pte (addr) >> 28);
 435         default:
 436                 return -1;
 437         }
 438 }
 439
 440 extern unsigned long *sparc_valid_addr_bitmap;
 441
 442 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 443 #define kern_addr_valid(addr) \
 444         (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 445
 446 extern int io_remap_page_range(unsigned long from, unsigned long to,
 447                                unsigned long size, pgprot_t prot, int space);
 448
 449 #include <asm-generic/pgtable.h>
 450
 451 #endif /* !(__ASSEMBLY__) */
 452
 453 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 454 #define HAVE_ARCH_UNMAPPED_AREA
 455
 456 #endif /* !(_SPARC_PGTABLE_H) */