1 #ifndef _MCF_PGTABLE_H 2 #define _MCF_PGTABLE_H 3 4 #include <asm/mcfmmu.h> 5 #include <asm/page.h> 6 7 /* 8 * MMUDR bits, in proper place. We write these directly into the MMUDR 9 * after masking from the pte. 10 */ 11 #define CF_PAGE_LOCKED MMUDR_LK /* 0x00000002 */ 12 #define CF_PAGE_EXEC MMUDR_X /* 0x00000004 */ 13 #define CF_PAGE_WRITABLE MMUDR_W /* 0x00000008 */ 14 #define CF_PAGE_READABLE MMUDR_R /* 0x00000010 */ 15 #define CF_PAGE_SYSTEM MMUDR_SP /* 0x00000020 */ 16 #define CF_PAGE_COPYBACK MMUDR_CM_CCB /* 0x00000040 */ 17 #define CF_PAGE_NOCACHE MMUDR_CM_NCP /* 0x00000080 */ 18 19 #define CF_CACHEMASK (~MMUDR_CM_CCB) 20 #define CF_PAGE_MMUDR_MASK 0x000000fe 21 22 #define _PAGE_NOCACHE030 CF_PAGE_NOCACHE 23 24 /* 25 * MMUTR bits, need shifting down. 26 */ 27 #define CF_PAGE_MMUTR_MASK 0x00000c00 28 #define CF_PAGE_MMUTR_SHIFT 10 29 30 #define CF_PAGE_VALID (MMUTR_V << CF_PAGE_MMUTR_SHIFT) 31 #define CF_PAGE_SHARED (MMUTR_SG << CF_PAGE_MMUTR_SHIFT) 32 33 /* 34 * Fake bits, not implemented in CF, will get masked out before 35 * hitting hardware. 36 */ 37 #define CF_PAGE_DIRTY 0x00000001 38 #define CF_PAGE_FILE 0x00000200 39 #define CF_PAGE_ACCESSED 0x00001000 40 41 #define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */ 42 #define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */ 43 #define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */ 44 #define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */ 45 #define _DESCTYPE_MASK 0x003 46 #define _CACHEMASK040 (~0x060) 47 #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ 48 49 /* 50 * Externally used page protection values. 51 */ 52 #define _PAGE_PRESENT (CF_PAGE_VALID) 53 #define _PAGE_ACCESSED (CF_PAGE_ACCESSED) 54 #define _PAGE_DIRTY (CF_PAGE_DIRTY) 55 #define _PAGE_READWRITE (CF_PAGE_READABLE \ 56 | CF_PAGE_WRITABLE \ 57 | CF_PAGE_SYSTEM \ 58 | CF_PAGE_SHARED) 59 60 /* 61 * Compound page protection values. 62 */ 63 #define PAGE_NONE __pgprot(CF_PAGE_VALID \ 64 | CF_PAGE_ACCESSED) 65 66 #define PAGE_SHARED __pgprot(CF_PAGE_VALID \ 67 | CF_PAGE_ACCESSED \ 68 | CF_PAGE_SHARED) 69 70 #define PAGE_INIT __pgprot(CF_PAGE_VALID \ 71 | CF_PAGE_READABLE \ 72 | CF_PAGE_WRITABLE \ 73 | CF_PAGE_EXEC \ 74 | CF_PAGE_SYSTEM) 75 76 #define PAGE_KERNEL __pgprot(CF_PAGE_VALID \ 77 | CF_PAGE_ACCESSED \ 78 | CF_PAGE_READABLE \ 79 | CF_PAGE_WRITABLE \ 80 | CF_PAGE_EXEC \ 81 | CF_PAGE_SYSTEM) 82 83 #define PAGE_COPY __pgprot(CF_PAGE_VALID \ 84 | CF_PAGE_ACCESSED \ 85 | CF_PAGE_READABLE \ 86 | CF_PAGE_DIRTY) 87 88 /* 89 * Page protections for initialising protection_map. See mm/mmap.c 90 * for use. In general, the bit positions are xwr, and P-items are 91 * private, the S-items are shared. 92 */ 93 #define __P000 PAGE_NONE 94 #define __P001 __pgprot(CF_PAGE_VALID \ 95 | CF_PAGE_ACCESSED \ 96 | CF_PAGE_READABLE) 97 #define __P010 __pgprot(CF_PAGE_VALID \ 98 | CF_PAGE_ACCESSED \ 99 | CF_PAGE_WRITABLE) 100 #define __P011 __pgprot(CF_PAGE_VALID \ 101 | CF_PAGE_ACCESSED \ 102 | CF_PAGE_READABLE \ 103 | CF_PAGE_WRITABLE) 104 #define __P100 __pgprot(CF_PAGE_VALID \ 105 | CF_PAGE_ACCESSED \ 106 | CF_PAGE_EXEC) 107 #define __P101 __pgprot(CF_PAGE_VALID \ 108 | CF_PAGE_ACCESSED \ 109 | CF_PAGE_READABLE \ 110 | CF_PAGE_EXEC) 111 #define __P110 __pgprot(CF_PAGE_VALID \ 112 | CF_PAGE_ACCESSED \ 113 | CF_PAGE_WRITABLE \ 114 | CF_PAGE_EXEC) 115 #define __P111 __pgprot(CF_PAGE_VALID \ 116 | CF_PAGE_ACCESSED \ 117 | CF_PAGE_READABLE \ 118 | CF_PAGE_WRITABLE \ 119 | CF_PAGE_EXEC) 120 121 #define __S000 PAGE_NONE 122 #define __S001 __pgprot(CF_PAGE_VALID \ 123 | CF_PAGE_ACCESSED \ 124 | CF_PAGE_READABLE) 125 #define __S010 PAGE_SHARED 126 #define __S011 __pgprot(CF_PAGE_VALID \ 127 | CF_PAGE_ACCESSED \ 128 | CF_PAGE_SHARED \ 129 | CF_PAGE_READABLE) 130 #define __S100 __pgprot(CF_PAGE_VALID \ 131 | CF_PAGE_ACCESSED \ 132 | CF_PAGE_EXEC) 133 #define __S101 __pgprot(CF_PAGE_VALID \ 134 | CF_PAGE_ACCESSED \ 135 | CF_PAGE_READABLE \ 136 | CF_PAGE_EXEC) 137 #define __S110 __pgprot(CF_PAGE_VALID \ 138 | CF_PAGE_ACCESSED \ 139 | CF_PAGE_SHARED \ 140 | CF_PAGE_EXEC) 141 #define __S111 __pgprot(CF_PAGE_VALID \ 142 | CF_PAGE_ACCESSED \ 143 | CF_PAGE_SHARED \ 144 | CF_PAGE_READABLE \ 145 | CF_PAGE_EXEC) 146 147 #define PTE_MASK PAGE_MASK 148 #define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY) 149 150 #ifndef __ASSEMBLY__ 151 152 /* 153 * Conversion functions: convert a page and protection to a page entry, 154 * and a page entry and page directory to the page they refer to. 155 */ 156 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 157 158 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 159 { 160 pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot); 161 return pte; 162 } 163 164 #define pmd_set(pmdp, ptep) do {} while (0) 165 166 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp) 167 { 168 pgd_val(*pgdp) = virt_to_phys(pmdp); 169 } 170 171 #define __pte_page(pte) ((unsigned long) (pte_val(pte) & PAGE_MASK)) 172 #define __pmd_page(pmd) ((unsigned long) (pmd_val(pmd))) 173 174 static inline int pte_none(pte_t pte) 175 { 176 return !pte_val(pte); 177 } 178 179 static inline int pte_present(pte_t pte) 180 { 181 return pte_val(pte) & CF_PAGE_VALID; 182 } 183 184 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 185 pte_t *ptep) 186 { 187 pte_val(*ptep) = 0; 188 } 189 190 #define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT) 191 #define pte_page(pte) virt_to_page(__pte_page(pte)) 192 193 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); } 194 #define pmd_none(pmd) pmd_none2(&(pmd)) 195 static inline int pmd_bad2(pmd_t *pmd) { return 0; } 196 #define pmd_bad(pmd) pmd_bad2(&(pmd)) 197 #define pmd_present(pmd) (!pmd_none2(&(pmd))) 198 static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; } 199 200 static inline int pgd_none(pgd_t pgd) { return 0; } 201 static inline int pgd_bad(pgd_t pgd) { return 0; } 202 static inline int pgd_present(pgd_t pgd) { return 1; } 203 static inline void pgd_clear(pgd_t *pgdp) {} 204 205 #define pte_ERROR(e) \ 206 printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \ 207 __FILE__, __LINE__, pte_val(e)) 208 #define pmd_ERROR(e) \ 209 printk(KERN_ERR "%s:%d: bad pmd %08lx.\n", \ 210 __FILE__, __LINE__, pmd_val(e)) 211 #define pgd_ERROR(e) \ 212 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \ 213 __FILE__, __LINE__, pgd_val(e)) 214 215 /* 216 * The following only work if pte_present() is true. 217 * Undefined behaviour if not... 218 * [we have the full set here even if they don't change from m68k] 219 */ 220 static inline int pte_read(pte_t pte) 221 { 222 return pte_val(pte) & CF_PAGE_READABLE; 223 } 224 225 static inline int pte_write(pte_t pte) 226 { 227 return pte_val(pte) & CF_PAGE_WRITABLE; 228 } 229 230 static inline int pte_exec(pte_t pte) 231 { 232 return pte_val(pte) & CF_PAGE_EXEC; 233 } 234 235 static inline int pte_dirty(pte_t pte) 236 { 237 return pte_val(pte) & CF_PAGE_DIRTY; 238 } 239 240 static inline int pte_young(pte_t pte) 241 { 242 return pte_val(pte) & CF_PAGE_ACCESSED; 243 } 244 245 static inline int pte_file(pte_t pte) 246 { 247 return pte_val(pte) & CF_PAGE_FILE; 248 } 249 250 static inline int pte_special(pte_t pte) 251 { 252 return 0; 253 } 254 255 static inline pte_t pte_wrprotect(pte_t pte) 256 { 257 pte_val(pte) &= ~CF_PAGE_WRITABLE; 258 return pte; 259 } 260 261 static inline pte_t pte_rdprotect(pte_t pte) 262 { 263 pte_val(pte) &= ~CF_PAGE_READABLE; 264 return pte; 265 } 266 267 static inline pte_t pte_exprotect(pte_t pte) 268 { 269 pte_val(pte) &= ~CF_PAGE_EXEC; 270 return pte; 271 } 272 273 static inline pte_t pte_mkclean(pte_t pte) 274 { 275 pte_val(pte) &= ~CF_PAGE_DIRTY; 276 return pte; 277 } 278 279 static inline pte_t pte_mkold(pte_t pte) 280 { 281 pte_val(pte) &= ~CF_PAGE_ACCESSED; 282 return pte; 283 } 284 285 static inline pte_t pte_mkwrite(pte_t pte) 286 { 287 pte_val(pte) |= CF_PAGE_WRITABLE; 288 return pte; 289 } 290 291 static inline pte_t pte_mkread(pte_t pte) 292 { 293 pte_val(pte) |= CF_PAGE_READABLE; 294 return pte; 295 } 296 297 static inline pte_t pte_mkexec(pte_t pte) 298 { 299 pte_val(pte) |= CF_PAGE_EXEC; 300 return pte; 301 } 302 303 static inline pte_t pte_mkdirty(pte_t pte) 304 { 305 pte_val(pte) |= CF_PAGE_DIRTY; 306 return pte; 307 } 308 309 static inline pte_t pte_mkyoung(pte_t pte) 310 { 311 pte_val(pte) |= CF_PAGE_ACCESSED; 312 return pte; 313 } 314 315 static inline pte_t pte_mknocache(pte_t pte) 316 { 317 pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40); 318 return pte; 319 } 320 321 static inline pte_t pte_mkcache(pte_t pte) 322 { 323 pte_val(pte) &= ~CF_PAGE_NOCACHE; 324 return pte; 325 } 326 327 static inline pte_t pte_mkspecial(pte_t pte) 328 { 329 return pte; 330 } 331 332 #define swapper_pg_dir kernel_pg_dir 333 extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; 334 335 /* 336 * Find an entry in a pagetable directory. 337 */ 338 #define pgd_index(address) ((address) >> PGDIR_SHIFT) 339 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 340 341 /* 342 * Find an entry in a kernel pagetable directory. 343 */ 344 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 345 346 /* 347 * Find an entry in the second-level pagetable. 348 */ 349 static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address) 350 { 351 return (pmd_t *) pgd; 352 } 353 354 /* 355 * Find an entry in the third-level pagetable. 356 */ 357 #define __pte_offset(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 358 #define pte_offset_kernel(dir, address) \ 359 ((pte_t *) __pmd_page(*(dir)) + __pte_offset(address)) 360 361 /* 362 * Disable caching for page at given kernel virtual address. 363 */ 364 static inline void nocache_page(void *vaddr) 365 { 366 pgd_t *dir; 367 pmd_t *pmdp; 368 pte_t *ptep; 369 unsigned long addr = (unsigned long) vaddr; 370 371 dir = pgd_offset_k(addr); 372 pmdp = pmd_offset(dir, addr); 373 ptep = pte_offset_kernel(pmdp, addr); 374 *ptep = pte_mknocache(*ptep); 375 } 376 377 /* 378 * Enable caching for page at given kernel virtual address. 379 */ 380 static inline void cache_page(void *vaddr) 381 { 382 pgd_t *dir; 383 pmd_t *pmdp; 384 pte_t *ptep; 385 unsigned long addr = (unsigned long) vaddr; 386 387 dir = pgd_offset_k(addr); 388 pmdp = pmd_offset(dir, addr); 389 ptep = pte_offset_kernel(pmdp, addr); 390 *ptep = pte_mkcache(*ptep); 391 } 392 393 #define PTE_FILE_MAX_BITS 21 394 #define PTE_FILE_SHIFT 11 395 396 static inline unsigned long pte_to_pgoff(pte_t pte) 397 { 398 return pte_val(pte) >> PTE_FILE_SHIFT; 399 } 400 401 static inline pte_t pgoff_to_pte(unsigned pgoff) 402 { 403 return __pte((pgoff << PTE_FILE_SHIFT) + CF_PAGE_FILE); 404 } 405 406 /* 407 * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) 408 */ 409 #define __swp_type(x) ((x).val & 0xFF) 410 #define __swp_offset(x) ((x).val >> PTE_FILE_SHIFT) 411 #define __swp_entry(typ, off) ((swp_entry_t) { (typ) | \ 412 (off << PTE_FILE_SHIFT) }) 413 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 414 #define __swp_entry_to_pte(x) (__pte((x).val)) 415 416 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) 417 418 #define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \ 419 __pte_offset(addr)) 420 #define pte_unmap(pte) ((void) 0) 421 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) 422 #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) 423 424 #endif /* !__ASSEMBLY__ */ 425 #endif /* _MCF_PGTABLE_H */ 426