arch/m68k/include/asm/mcf_pgtable.h

   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_ACCESSED        0x00001000
  39
  40 #define _PAGE_CACHE040          0x020   /* 68040 cache mode, cachable, copyback */
  41 #define _PAGE_NOCACHE_S         0x040   /* 68040 no-cache mode, serialized */
  42 #define _PAGE_NOCACHE           0x060   /* 68040 cache mode, non-serialized */
  43 #define _PAGE_CACHE040W         0x000   /* 68040 cache mode, cachable, write-through */
  44 #define _DESCTYPE_MASK          0x003
  45 #define _CACHEMASK040           (~0x060)
  46 #define _PAGE_GLOBAL040         0x400   /* 68040 global bit, used for kva descs */
  47
  48 /*
  49  * Externally used page protection values.
  50  */
  51 #define _PAGE_PRESENT   (CF_PAGE_VALID)
  52 #define _PAGE_ACCESSED  (CF_PAGE_ACCESSED)
  53 #define _PAGE_DIRTY     (CF_PAGE_DIRTY)
  54 #define _PAGE_READWRITE (CF_PAGE_READABLE \
  55                                 | CF_PAGE_WRITABLE \
  56                                 | CF_PAGE_SYSTEM \
  57                                 | CF_PAGE_SHARED)
  58
  59 /*
  60  * Compound page protection values.
  61  */
  62 #define PAGE_NONE       __pgprot(CF_PAGE_VALID \
  63                                  | CF_PAGE_ACCESSED)
  64
  65 #define PAGE_SHARED     __pgprot(CF_PAGE_VALID \
  66                                  | CF_PAGE_ACCESSED \
  67                                  | CF_PAGE_SHARED)
  68
  69 #define PAGE_INIT       __pgprot(CF_PAGE_VALID \
  70                                  | CF_PAGE_READABLE \
  71                                  | CF_PAGE_WRITABLE \
  72                                  | CF_PAGE_EXEC \
  73                                  | CF_PAGE_SYSTEM)
  74
  75 #define PAGE_KERNEL     __pgprot(CF_PAGE_VALID \
  76                                  | CF_PAGE_ACCESSED \
  77                                  | CF_PAGE_READABLE \
  78                                  | CF_PAGE_WRITABLE \
  79                                  | CF_PAGE_EXEC \
  80                                  | CF_PAGE_SYSTEM \
  81                                  | CF_PAGE_SHARED)
  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_special(pte_t pte)
 246 {
 247         return 0;
 248 }
 249
 250 static inline pte_t pte_wrprotect(pte_t pte)
 251 {
 252         pte_val(pte) &= ~CF_PAGE_WRITABLE;
 253         return pte;
 254 }
 255
 256 static inline pte_t pte_rdprotect(pte_t pte)
 257 {
 258         pte_val(pte) &= ~CF_PAGE_READABLE;
 259         return pte;
 260 }
 261
 262 static inline pte_t pte_exprotect(pte_t pte)
 263 {
 264         pte_val(pte) &= ~CF_PAGE_EXEC;
 265         return pte;
 266 }
 267
 268 static inline pte_t pte_mkclean(pte_t pte)
 269 {
 270         pte_val(pte) &= ~CF_PAGE_DIRTY;
 271         return pte;
 272 }
 273
 274 static inline pte_t pte_mkold(pte_t pte)
 275 {
 276         pte_val(pte) &= ~CF_PAGE_ACCESSED;
 277         return pte;
 278 }
 279
 280 static inline pte_t pte_mkwrite(pte_t pte)
 281 {
 282         pte_val(pte) |= CF_PAGE_WRITABLE;
 283         return pte;
 284 }
 285
 286 static inline pte_t pte_mkread(pte_t pte)
 287 {
 288         pte_val(pte) |= CF_PAGE_READABLE;
 289         return pte;
 290 }
 291
 292 static inline pte_t pte_mkexec(pte_t pte)
 293 {
 294         pte_val(pte) |= CF_PAGE_EXEC;
 295         return pte;
 296 }
 297
 298 static inline pte_t pte_mkdirty(pte_t pte)
 299 {
 300         pte_val(pte) |= CF_PAGE_DIRTY;
 301         return pte;
 302 }
 303
 304 static inline pte_t pte_mkyoung(pte_t pte)
 305 {
 306         pte_val(pte) |= CF_PAGE_ACCESSED;
 307         return pte;
 308 }
 309
 310 static inline pte_t pte_mknocache(pte_t pte)
 311 {
 312         pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
 313         return pte;
 314 }
 315
 316 static inline pte_t pte_mkcache(pte_t pte)
 317 {
 318         pte_val(pte) &= ~CF_PAGE_NOCACHE;
 319         return pte;
 320 }
 321
 322 static inline pte_t pte_mkspecial(pte_t pte)
 323 {
 324         return pte;
 325 }
 326
 327 #define swapper_pg_dir kernel_pg_dir
 328 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
 329
 330 /*
 331  * Find an entry in a pagetable directory.
 332  */
 333 #define pgd_index(address)      ((address) >> PGDIR_SHIFT)
 334 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 335
 336 /*
 337  * Find an entry in a kernel pagetable directory.
 338  */
 339 #define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 340
 341 /*
 342  * Find an entry in the second-level pagetable.
 343  */
 344 static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
 345 {
 346         return (pmd_t *) pgd;
 347 }
 348
 349 /*
 350  * Find an entry in the third-level pagetable.
 351  */
 352 #define __pte_offset(address)   ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 353 #define pte_offset_kernel(dir, address) \
 354         ((pte_t *) __pmd_page(*(dir)) + __pte_offset(address))
 355
 356 /*
 357  * Disable caching for page at given kernel virtual address.
 358  */
 359 static inline void nocache_page(void *vaddr)
 360 {
 361         pgd_t *dir;
 362         pmd_t *pmdp;
 363         pte_t *ptep;
 364         unsigned long addr = (unsigned long) vaddr;
 365
 366         dir = pgd_offset_k(addr);
 367         pmdp = pmd_offset(dir, addr);
 368         ptep = pte_offset_kernel(pmdp, addr);
 369         *ptep = pte_mknocache(*ptep);
 370 }
 371
 372 /*
 373  * Enable caching for page at given kernel virtual address.
 374  */
 375 static inline void cache_page(void *vaddr)
 376 {
 377         pgd_t *dir;
 378         pmd_t *pmdp;
 379         pte_t *ptep;
 380         unsigned long addr = (unsigned long) vaddr;
 381
 382         dir = pgd_offset_k(addr);
 383         pmdp = pmd_offset(dir, addr);
 384         ptep = pte_offset_kernel(pmdp, addr);
 385         *ptep = pte_mkcache(*ptep);
 386 }
 387
 388 /*
 389  * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
 390  */
 391 #define __swp_type(x)           ((x).val & 0xFF)
 392 #define __swp_offset(x)         ((x).val >> 11)
 393 #define __swp_entry(typ, off)   ((swp_entry_t) { (typ) | \
 394                                         (off << 11) })
 395 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 396 #define __swp_entry_to_pte(x)   (__pte((x).val))
 397
 398 #define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 399
 400 #define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \
 401                                        __pte_offset(addr))
 402 #define pte_unmap(pte)          ((void) 0)
 403 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 404 #define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
 405
 406 #endif  /* !__ASSEMBLY__ */
 407 #endif  /* _MCF_PGTABLE_H */