1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _MCF_PGTABLE_H 3 #define _MCF_PGTABLE_H 4 5 #include <asm/mcfmmu.h> 6 #include <asm/page.h> 7 8 /* 9 * MMUDR bits, in proper place. We write these directly into the MMUDR 10 * after masking from the pte. 11 */ 12 #define CF_PAGE_LOCKED MMUDR_LK /* 0x00000002 */ 13 #define CF_PAGE_EXEC MMUDR_X /* 0x00000004 */ 14 #define CF_PAGE_WRITABLE MMUDR_W /* 0x00000008 */ 15 #define CF_PAGE_READABLE MMUDR_R /* 0x00000010 */ 16 #define CF_PAGE_SYSTEM MMUDR_SP /* 0x00000020 */ 17 #define CF_PAGE_COPYBACK MMUDR_CM_CCB /* 0x00000040 */ 18 #define CF_PAGE_NOCACHE MMUDR_CM_NCP /* 0x00000080 */ 19 20 #define CF_CACHEMASK (~MMUDR_CM_CCB) 21 #define CF_PAGE_MMUDR_MASK 0x000000fe 22 23 #define _PAGE_NOCACHE030 CF_PAGE_NOCACHE 24 25 /* 26 * MMUTR bits, need shifting down. 27 */ 28 #define CF_PAGE_MMUTR_MASK 0x00000c00 29 #define CF_PAGE_MMUTR_SHIFT 10 30 31 #define CF_PAGE_VALID (MMUTR_V << CF_PAGE_MMUTR_SHIFT) 32 #define CF_PAGE_SHARED (MMUTR_SG << CF_PAGE_MMUTR_SHIFT) 33 34 /* 35 * Fake bits, not implemented in CF, will get masked out before 36 * hitting hardware. 37 */ 38 #define CF_PAGE_DIRTY 0x00000001 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 | CF_PAGE_SHARED) 83 84 #define PAGE_COPY __pgprot(CF_PAGE_VALID \ 85 | CF_PAGE_ACCESSED \ 86 | CF_PAGE_READABLE \ 87 | CF_PAGE_DIRTY) 88 89 /* 90 * Page protections for initialising protection_map. See mm/mmap.c 91 * for use. In general, the bit positions are xwr, and P-items are 92 * private, the S-items are shared. 93 */ 94 #define __P000 PAGE_NONE 95 #define __P001 __pgprot(CF_PAGE_VALID \ 96 | CF_PAGE_ACCESSED \ 97 | CF_PAGE_READABLE) 98 #define __P010 __pgprot(CF_PAGE_VALID \ 99 | CF_PAGE_ACCESSED \ 100 | CF_PAGE_WRITABLE) 101 #define __P011 __pgprot(CF_PAGE_VALID \ 102 | CF_PAGE_ACCESSED \ 103 | CF_PAGE_READABLE \ 104 | CF_PAGE_WRITABLE) 105 #define __P100 __pgprot(CF_PAGE_VALID \ 106 | CF_PAGE_ACCESSED \ 107 | CF_PAGE_EXEC) 108 #define __P101 __pgprot(CF_PAGE_VALID \ 109 | CF_PAGE_ACCESSED \ 110 | CF_PAGE_READABLE \ 111 | CF_PAGE_EXEC) 112 #define __P110 __pgprot(CF_PAGE_VALID \ 113 | CF_PAGE_ACCESSED \ 114 | CF_PAGE_WRITABLE \ 115 | CF_PAGE_EXEC) 116 #define __P111 __pgprot(CF_PAGE_VALID \ 117 | CF_PAGE_ACCESSED \ 118 | CF_PAGE_READABLE \ 119 | CF_PAGE_WRITABLE \ 120 | CF_PAGE_EXEC) 121 122 #define __S000 PAGE_NONE 123 #define __S001 __pgprot(CF_PAGE_VALID \ 124 | CF_PAGE_ACCESSED \ 125 | CF_PAGE_READABLE) 126 #define __S010 PAGE_SHARED 127 #define __S011 __pgprot(CF_PAGE_VALID \ 128 | CF_PAGE_ACCESSED \ 129 | CF_PAGE_SHARED \ 130 | CF_PAGE_READABLE) 131 #define __S100 __pgprot(CF_PAGE_VALID \ 132 | CF_PAGE_ACCESSED \ 133 | CF_PAGE_EXEC) 134 #define __S101 __pgprot(CF_PAGE_VALID \ 135 | CF_PAGE_ACCESSED \ 136 | CF_PAGE_READABLE \ 137 | CF_PAGE_EXEC) 138 #define __S110 __pgprot(CF_PAGE_VALID \ 139 | CF_PAGE_ACCESSED \ 140 | CF_PAGE_SHARED \ 141 | CF_PAGE_EXEC) 142 #define __S111 __pgprot(CF_PAGE_VALID \ 143 | CF_PAGE_ACCESSED \ 144 | CF_PAGE_SHARED \ 145 | CF_PAGE_READABLE \ 146 | CF_PAGE_EXEC) 147 148 #define PTE_MASK PAGE_MASK 149 #define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY) 150 151 #ifndef __ASSEMBLY__ 152 153 /* 154 * Conversion functions: convert a page and protection to a page entry, 155 * and a page entry and page directory to the page they refer to. 156 */ 157 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 158 159 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 160 { 161 pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot); 162 return pte; 163 } 164 165 #define pmd_set(pmdp, ptep) do {} while (0) 166 167 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp) 168 { 169 pgd_val(*pgdp) = virt_to_phys(pmdp); 170 } 171 172 #define __pte_page(pte) ((unsigned long) (pte_val(pte) & PAGE_MASK)) 173 #define __pmd_page(pmd) ((unsigned long) (pmd_val(pmd))) 174 175 static inline int pte_none(pte_t pte) 176 { 177 return !pte_val(pte); 178 } 179 180 static inline int pte_present(pte_t pte) 181 { 182 return pte_val(pte) & CF_PAGE_VALID; 183 } 184 185 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 186 pte_t *ptep) 187 { 188 pte_val(*ptep) = 0; 189 } 190 191 #define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT) 192 #define pte_page(pte) virt_to_page(__pte_page(pte)) 193 194 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); } 195 #define pmd_none(pmd) pmd_none2(&(pmd)) 196 static inline int pmd_bad2(pmd_t *pmd) { return 0; } 197 #define pmd_bad(pmd) pmd_bad2(&(pmd)) 198 #define pmd_present(pmd) (!pmd_none2(&(pmd))) 199 static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; } 200 201 #define pte_ERROR(e) \ 202 printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \ 203 __FILE__, __LINE__, pte_val(e)) 204 #define pgd_ERROR(e) \ 205 printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \ 206 __FILE__, __LINE__, pgd_val(e)) 207 208 /* 209 * The following only work if pte_present() is true. 210 * Undefined behaviour if not... 211 * [we have the full set here even if they don't change from m68k] 212 */ 213 static inline int pte_read(pte_t pte) 214 { 215 return pte_val(pte) & CF_PAGE_READABLE; 216 } 217 218 static inline int pte_write(pte_t pte) 219 { 220 return pte_val(pte) & CF_PAGE_WRITABLE; 221 } 222 223 static inline int pte_exec(pte_t pte) 224 { 225 return pte_val(pte) & CF_PAGE_EXEC; 226 } 227 228 static inline int pte_dirty(pte_t pte) 229 { 230 return pte_val(pte) & CF_PAGE_DIRTY; 231 } 232 233 static inline int pte_young(pte_t pte) 234 { 235 return pte_val(pte) & CF_PAGE_ACCESSED; 236 } 237 238 static inline int pte_special(pte_t pte) 239 { 240 return 0; 241 } 242 243 static inline pte_t pte_wrprotect(pte_t pte) 244 { 245 pte_val(pte) &= ~CF_PAGE_WRITABLE; 246 return pte; 247 } 248 249 static inline pte_t pte_rdprotect(pte_t pte) 250 { 251 pte_val(pte) &= ~CF_PAGE_READABLE; 252 return pte; 253 } 254 255 static inline pte_t pte_exprotect(pte_t pte) 256 { 257 pte_val(pte) &= ~CF_PAGE_EXEC; 258 return pte; 259 } 260 261 static inline pte_t pte_mkclean(pte_t pte) 262 { 263 pte_val(pte) &= ~CF_PAGE_DIRTY; 264 return pte; 265 } 266 267 static inline pte_t pte_mkold(pte_t pte) 268 { 269 pte_val(pte) &= ~CF_PAGE_ACCESSED; 270 return pte; 271 } 272 273 static inline pte_t pte_mkwrite(pte_t pte) 274 { 275 pte_val(pte) |= CF_PAGE_WRITABLE; 276 return pte; 277 } 278 279 static inline pte_t pte_mkread(pte_t pte) 280 { 281 pte_val(pte) |= CF_PAGE_READABLE; 282 return pte; 283 } 284 285 static inline pte_t pte_mkexec(pte_t pte) 286 { 287 pte_val(pte) |= CF_PAGE_EXEC; 288 return pte; 289 } 290 291 static inline pte_t pte_mkdirty(pte_t pte) 292 { 293 pte_val(pte) |= CF_PAGE_DIRTY; 294 return pte; 295 } 296 297 static inline pte_t pte_mkyoung(pte_t pte) 298 { 299 pte_val(pte) |= CF_PAGE_ACCESSED; 300 return pte; 301 } 302 303 static inline pte_t pte_mknocache(pte_t pte) 304 { 305 pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40); 306 return pte; 307 } 308 309 static inline pte_t pte_mkcache(pte_t pte) 310 { 311 pte_val(pte) &= ~CF_PAGE_NOCACHE; 312 return pte; 313 } 314 315 static inline pte_t pte_mkspecial(pte_t pte) 316 { 317 return pte; 318 } 319 320 #define swapper_pg_dir kernel_pg_dir 321 extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; 322 323 /* 324 * Find an entry in a pagetable directory. 325 */ 326 #define pgd_index(address) ((address) >> PGDIR_SHIFT) 327 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 328 329 /* 330 * Find an entry in a kernel pagetable directory. 331 */ 332 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 333 334 /* 335 * Find an entry in the third-level pagetable. 336 */ 337 #define __pte_offset(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 338 #define pte_offset_kernel(dir, address) \ 339 ((pte_t *) __pmd_page(*(dir)) + __pte_offset(address)) 340 341 /* 342 * Disable caching for page at given kernel virtual address. 343 */ 344 static inline void nocache_page(void *vaddr) 345 { 346 pgd_t *dir; 347 p4d_t *p4dp; 348 pud_t *pudp; 349 pmd_t *pmdp; 350 pte_t *ptep; 351 unsigned long addr = (unsigned long) vaddr; 352 353 dir = pgd_offset_k(addr); 354 p4dp = p4d_offset(dir, addr); 355 pudp = pud_offset(p4dp, addr); 356 pmdp = pmd_offset(pudp, addr); 357 ptep = pte_offset_kernel(pmdp, addr); 358 *ptep = pte_mknocache(*ptep); 359 } 360 361 /* 362 * Enable caching for page at given kernel virtual address. 363 */ 364 static inline void cache_page(void *vaddr) 365 { 366 pgd_t *dir; 367 p4d_t *p4dp; 368 pud_t *pudp; 369 pmd_t *pmdp; 370 pte_t *ptep; 371 unsigned long addr = (unsigned long) vaddr; 372 373 dir = pgd_offset_k(addr); 374 p4dp = p4d_offset(dir, addr); 375 pudp = pud_offset(p4dp, addr); 376 pmdp = pmd_offset(pudp, addr); 377 ptep = pte_offset_kernel(pmdp, addr); 378 *ptep = pte_mkcache(*ptep); 379 } 380 381 /* 382 * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) 383 */ 384 #define __swp_type(x) ((x).val & 0xFF) 385 #define __swp_offset(x) ((x).val >> 11) 386 #define __swp_entry(typ, off) ((swp_entry_t) { (typ) | \ 387 (off << 11) }) 388 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 389 #define __swp_entry_to_pte(x) (__pte((x).val)) 390 391 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) 392 393 #define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \ 394 __pte_offset(addr)) 395 #define pte_unmap(pte) ((void) 0) 396 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) 397 #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) 398 399 #endif /* !__ASSEMBLY__ */ 400 #endif /* _MCF_PGTABLE_H */ 401