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 #ifndef __ASSEMBLY__ 12 #include <asm-generic/4level-fixup.h> 13 14 #include <linux/spinlock.h> 15 #include <linux/swap.h> 16 #include <asm/types.h> 17 #include <asm/pgtsun4c.h> 18 #include <asm/pgtsrmmu.h> 19 #include <asm/vac-ops.h> 20 #include <asm/oplib.h> 21 #include <asm/btfixup.h> 22 #include <asm/system.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 SUN4C_PMD_SHIFT 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 BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t) 270 271 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot) 272 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot) 273 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space) 274 275 #define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot) 276 277 BTFIXUPDEF_INT(pte_modify_mask) 278 279 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; 280 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 281 { 282 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) | 283 pgprot_val(newprot)); 284 } 285 286 #define pgd_index(address) ((address) >> PGDIR_SHIFT) 287 288 /* to find an entry in a page-table-directory */ 289 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 290 291 /* to find an entry in a kernel page-table-directory */ 292 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 293 294 /* Find an entry in the second-level page table.. */ 295 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long) 296 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr) 297 298 /* Find an entry in the third-level page table.. */ 299 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long) 300 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr) 301 302 /* 303 * This shortcut works on sun4m (and sun4d) because the nocache area is static, 304 * and sun4c is guaranteed to have no highmem anyway. 305 */ 306 #define pte_offset_map(d, a) pte_offset_kernel(d,a) 307 #define pte_offset_map_nested(d, a) pte_offset_kernel(d,a) 308 309 #define pte_unmap(pte) do{}while(0) 310 #define pte_unmap_nested(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 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte); 358 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff); 359 360 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte) 361 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off) 362 363 /* 364 * This is made a constant because mm/fremap.c required a constant. 365 * Note that layout of these bits is different between sun4c.c and srmmu.c. 366 */ 367 #define PTE_FILE_MAX_BITS 24 368 369 /* 370 */ 371 struct ctx_list { 372 struct ctx_list *next; 373 struct ctx_list *prev; 374 unsigned int ctx_number; 375 struct mm_struct *ctx_mm; 376 }; 377 378 extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */ 379 extern struct ctx_list ctx_free; /* Head of free list */ 380 extern struct ctx_list ctx_used; /* Head of used contexts list */ 381 382 #define NO_CONTEXT -1 383 384 static inline void remove_from_ctx_list(struct ctx_list *entry) 385 { 386 entry->next->prev = entry->prev; 387 entry->prev->next = entry->next; 388 } 389 390 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry) 391 { 392 entry->next = head; 393 (entry->prev = head->prev)->next = entry; 394 head->prev = entry; 395 } 396 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry) 397 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry) 398 399 static inline unsigned long 400 __get_phys (unsigned long addr) 401 { 402 switch (sparc_cpu_model){ 403 case sun4: 404 case sun4c: 405 return sun4c_get_pte (addr) << PAGE_SHIFT; 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 sun4: 419 case sun4c: 420 return -1; /* Don't check iospace on sun4c */ 421 case sun4m: 422 case sun4d: 423 return (srmmu_get_pte (addr) >> 28); 424 default: 425 return -1; 426 } 427 } 428 429 extern unsigned long *sparc_valid_addr_bitmap; 430 431 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 432 #define kern_addr_valid(addr) \ 433 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) 434 435 extern int io_remap_pfn_range(struct vm_area_struct *vma, 436 unsigned long from, unsigned long pfn, 437 unsigned long size, pgprot_t prot); 438 439 /* 440 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in 441 * its high 4 bits. These macros/functions put it there or get it from there. 442 */ 443 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) 444 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) 445 #define GET_PFN(pfn) (pfn & 0x0fffffffUL) 446 447 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 448 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ 449 ({ \ 450 int __changed = !pte_same(*(__ptep), __entry); \ 451 if (__changed) { \ 452 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ 453 flush_tlb_page(__vma, __address); \ 454 } \ 455 (sparc_cpu_model == sun4c) || __changed; \ 456 }) 457 458 #include <asm-generic/pgtable.h> 459 460 #endif /* !(__ASSEMBLY__) */ 461 462 #define VMALLOC_START 0xfe600000 463 /* XXX Alter this when I get around to fixing sun4c - Anton */ 464 #define VMALLOC_END 0xffc00000 465 466 467 /* We provide our own get_unmapped_area to cope with VA holes for userland */ 468 #define HAVE_ARCH_UNMAPPED_AREA 469 470 /* 471 * No page table caches to initialise 472 */ 473 #define pgtable_cache_init() do { } while (0) 474 475 #endif /* !(_SPARC_PGTABLE_H) */ 476