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/cpu_type.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) */ 487