LXR linux/arch/m68k/include/asm/mcf

   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                                 | 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
 159static 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
 167static 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
 175static inline int pte_none(pte_t pte)
 176{
 177        return !pte_val(pte);
 178}
 179
 180static inline int pte_present(pte_t pte)
 181{
 182        return pte_val(pte) & CF_PAGE_VALID;
 183}
 184
 185static 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
 194static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
 195#define pmd_none(pmd) pmd_none2(&(pmd))
 196static 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)))
 199static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
 200
 201static inline int pgd_none(pgd_t pgd) { return 0; }
 202static inline int pgd_bad(pgd_t pgd) { return 0; }
 203static inline int pgd_present(pgd_t pgd) { return 1; }
 204static inline void pgd_clear(pgd_t *pgdp) {}
 205
 206#define pte_ERROR(e) \
 207        printk(KERN_ERR "%s:%d: bad pte %08lx.\n",      \
 208        __FILE__, __LINE__, pte_val(e))
 209#define pmd_ERROR(e) \
 210        printk(KERN_ERR "%s:%d: bad pmd %08lx.\n",      \
 211        __FILE__, __LINE__, pmd_val(e))
 212#define pgd_ERROR(e) \
 213        printk(KERN_ERR "%s:%d: bad pgd %08lx.\n",      \
 214        __FILE__, __LINE__, pgd_val(e))
 215
 216/*
 217 * The following only work if pte_present() is true.
 218 * Undefined behaviour if not...
 219 * [we have the full set here even if they don't change from m68k]
 220 */
 221static inline int pte_read(pte_t pte)
 222{
 223        return pte_val(pte) & CF_PAGE_READABLE;
 224}
 225
 226static inline int pte_write(pte_t pte)
 227{
 228        return pte_val(pte) & CF_PAGE_WRITABLE;
 229}
 230
 231static inline int pte_exec(pte_t pte)
 232{
 233        return pte_val(pte) & CF_PAGE_EXEC;
 234}
 235
 236static inline int pte_dirty(pte_t pte)
 237{
 238        return pte_val(pte) & CF_PAGE_DIRTY;
 239}
 240
 241static inline int pte_young(pte_t pte)
 242{
 243        return pte_val(pte) & CF_PAGE_ACCESSED;
 244}
 245
 246static inline int pte_file(pte_t pte)
 247{
 248        return pte_val(pte) & CF_PAGE_FILE;
 249}
 250
 251static inline int pte_special(pte_t pte)
 252{
 253        return 0;
 254}
 255
 256static inline pte_t pte_wrprotect(pte_t pte)
 257{
 258        pte_val(pte) &= ~CF_PAGE_WRITABLE;
 259        return pte;
 260}
 261
 262static inline pte_t pte_rdprotect(pte_t pte)
 263{
 264        pte_val(pte) &= ~CF_PAGE_READABLE;
 265        return pte;
 266}
 267
 268static inline pte_t pte_exprotect(pte_t pte)
 269{
 270        pte_val(pte) &= ~CF_PAGE_EXEC;
 271        return pte;
 272}
 273
 274static inline pte_t pte_mkclean(pte_t pte)
 275{
 276        pte_val(pte) &= ~CF_PAGE_DIRTY;
 277        return pte;
 278}
 279
 280static inline pte_t pte_mkold(pte_t pte)
 281{
 282        pte_val(pte) &= ~CF_PAGE_ACCESSED;
 283        return pte;
 284}
 285
 286static inline pte_t pte_mkwrite(pte_t pte)
 287{
 288        pte_val(pte) |= CF_PAGE_WRITABLE;
 289        return pte;
 290}
 291
 292static inline pte_t pte_mkread(pte_t pte)
 293{
 294        pte_val(pte) |= CF_PAGE_READABLE;
 295        return pte;
 296}
 297
 298static inline pte_t pte_mkexec(pte_t pte)
 299{
 300        pte_val(pte) |= CF_PAGE_EXEC;
 301        return pte;
 302}
 303
 304static inline pte_t pte_mkdirty(pte_t pte)
 305{
 306        pte_val(pte) |= CF_PAGE_DIRTY;
 307        return pte;
 308}
 309
 310static inline pte_t pte_mkyoung(pte_t pte)
 311{
 312        pte_val(pte) |= CF_PAGE_ACCESSED;
 313        return pte;
 314}
 315
 316static inline pte_t pte_mknocache(pte_t pte)
 317{
 318        pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
 319        return pte;
 320}
 321
 322static inline pte_t pte_mkcache(pte_t pte)
 323{
 324        pte_val(pte) &= ~CF_PAGE_NOCACHE;
 325        return pte;
 326}
 327
 328static inline pte_t pte_mkspecial(pte_t pte)
 329{
 330        return pte;
 331}
 332
 333#define swapper_pg_dir kernel_pg_dir
 334extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
 335
 336/*
 337 * Find an entry in a pagetable directory.
 338 */
 339#define pgd_index(address)      ((address) >> PGDIR_SHIFT)
 340#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 341
 342/*
 343 * Find an entry in a kernel pagetable directory.
 344 */
 345#define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 346
 347/*
 348 * Find an entry in the second-level pagetable.
 349 */
 350static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
 351{
 352        return (pmd_t *) pgd;
 353}
 354
 355/*
 356 * Find an entry in the third-level pagetable.
 357 */
 358#define __pte_offset(address)   ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 359#define pte_offset_kernel(dir, address) \
 360        ((pte_t *) __pmd_page(*(dir)) + __pte_offset(address))
 361
 362/*
 363 * Disable caching for page at given kernel virtual address.
 364 */
 365static inline void nocache_page(void *vaddr)
 366{
 367        pgd_t *dir;
 368        pmd_t *pmdp;
 369        pte_t *ptep;
 370        unsigned long addr = (unsigned long) vaddr;
 371
 372        dir = pgd_offset_k(addr);
 373        pmdp = pmd_offset(dir, addr);
 374        ptep = pte_offset_kernel(pmdp, addr);
 375        *ptep = pte_mknocache(*ptep);
 376}
 377
 378/*
 379 * Enable caching for page at given kernel virtual address.
 380 */
 381static inline void cache_page(void *vaddr)
 382{
 383        pgd_t *dir;
 384        pmd_t *pmdp;
 385        pte_t *ptep;
 386        unsigned long addr = (unsigned long) vaddr;
 387
 388        dir = pgd_offset_k(addr);
 389        pmdp = pmd_offset(dir, addr);
 390        ptep = pte_offset_kernel(pmdp, addr);
 391        *ptep = pte_mkcache(*ptep);
 392}
 393
 394#define PTE_FILE_MAX_BITS       21
 395#define PTE_FILE_SHIFT          11
 396
 397static inline unsigned long pte_to_pgoff(pte_t pte)
 398{
 399        return pte_val(pte) >> PTE_FILE_SHIFT;
 400}
 401
 402static inline pte_t pgoff_to_pte(unsigned pgoff)
 403{
 404        return __pte((pgoff << PTE_FILE_SHIFT) + CF_PAGE_FILE);
 405}
 406
 407/*
 408 * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
 409 */
 410#define __swp_type(x)           ((x).val & 0xFF)
 411#define __swp_offset(x)         ((x).val >> PTE_FILE_SHIFT)
 412#define __swp_entry(typ, off)   ((swp_entry_t) { (typ) | \
 413                                        (off << PTE_FILE_SHIFT) })
 414#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 415#define __swp_entry_to_pte(x)   (__pte((x).val))
 416
 417#define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 418
 419#define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \
 420                                       __pte_offset(addr))
 421#define pte_unmap(pte)          ((void) 0)
 422#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 423#define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
 424
 425#endif  /* !__ASSEMBLY__ */
 426#endif  /* _MCF_PGTABLE_H */
 427