arch/m68k/include/asm/motorola_pgtable.h

   1 #ifndef _MOTOROLA_PGTABLE_H
   2 #define _MOTOROLA_PGTABLE_H
   3
   4
   5 /*
   6  * Definitions for MMU descriptors
   7  */
   8 #define _PAGE_PRESENT   0x001
   9 #define _PAGE_SHORT     0x002
  10 #define _PAGE_RONLY     0x004
  11 #define _PAGE_ACCESSED  0x008
  12 #define _PAGE_DIRTY     0x010
  13 #define _PAGE_SUPER     0x080   /* 68040 supervisor only */
  14 #define _PAGE_GLOBAL040 0x400   /* 68040 global bit, used for kva descs */
  15 #define _PAGE_NOCACHE030 0x040  /* 68030 no-cache mode */
  16 #define _PAGE_NOCACHE   0x060   /* 68040 cache mode, non-serialized */
  17 #define _PAGE_NOCACHE_S 0x040   /* 68040 no-cache mode, serialized */
  18 #define _PAGE_CACHE040  0x020   /* 68040 cache mode, cachable, copyback */
  19 #define _PAGE_CACHE040W 0x000   /* 68040 cache mode, cachable, write-through */
  20
  21 #define _DESCTYPE_MASK  0x003
  22
  23 #define _CACHEMASK040   (~0x060)
  24 #define _TABLE_MASK     (0xfffffe00)
  25
  26 #define _PAGE_TABLE     (_PAGE_SHORT)
  27 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
  28
  29 #define _PAGE_PROTNONE  0x004
  30 #define _PAGE_FILE      0x008   /* pagecache or swap? */
  31
  32 #ifndef __ASSEMBLY__
  33
  34 /* This is the cache mode to be used for pages containing page descriptors for
  35  * processors >= '040. It is in pte_mknocache(), and the variable is defined
  36  * and initialized in head.S */
  37 extern int m68k_pgtable_cachemode;
  38
  39 /* This is the cache mode for normal pages, for supervisor access on
  40  * processors >= '040. It is used in pte_mkcache(), and the variable is
  41  * defined and initialized in head.S */
  42
  43 #if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
  44 #define m68k_supervisor_cachemode _PAGE_CACHE040W
  45 #elif defined(CPU_M68040_OR_M68060_ONLY)
  46 #define m68k_supervisor_cachemode _PAGE_CACHE040
  47 #elif defined(CPU_M68020_OR_M68030_ONLY)
  48 #define m68k_supervisor_cachemode 0
  49 #else
  50 extern int m68k_supervisor_cachemode;
  51 #endif
  52
  53 #if defined(CPU_M68040_OR_M68060_ONLY)
  54 #define mm_cachebits _PAGE_CACHE040
  55 #elif defined(CPU_M68020_OR_M68030_ONLY)
  56 #define mm_cachebits 0
  57 #else
  58 extern unsigned long mm_cachebits;
  59 #endif
  60
  61 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
  62 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
  63 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  64 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  65 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
  66
  67 /* Alternate definitions that are compile time constants, for
  68    initializing protection_map.  The cachebits are fixed later.  */
  69 #define PAGE_NONE_C     __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  70 #define PAGE_SHARED_C   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
  71 #define PAGE_COPY_C     __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  72 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  73
  74 /*
  75  * The m68k can't do page protection for execute, and considers that the same are read.
  76  * Also, write permissions imply read permissions. This is the closest we can get..
  77  */
  78 #define __P000  PAGE_NONE_C
  79 #define __P001  PAGE_READONLY_C
  80 #define __P010  PAGE_COPY_C
  81 #define __P011  PAGE_COPY_C
  82 #define __P100  PAGE_READONLY_C
  83 #define __P101  PAGE_READONLY_C
  84 #define __P110  PAGE_COPY_C
  85 #define __P111  PAGE_COPY_C
  86
  87 #define __S000  PAGE_NONE_C
  88 #define __S001  PAGE_READONLY_C
  89 #define __S010  PAGE_SHARED_C
  90 #define __S011  PAGE_SHARED_C
  91 #define __S100  PAGE_READONLY_C
  92 #define __S101  PAGE_READONLY_C
  93 #define __S110  PAGE_SHARED_C
  94 #define __S111  PAGE_SHARED_C
  95
  96 /*
  97  * Conversion functions: convert a page and protection to a page entry,
  98  * and a page entry and page directory to the page they refer to.
  99  */
 100 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
 101
 102 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 103 {
 104         pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
 105         return pte;
 106 }
 107
 108 static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
 109 {
 110         unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
 111         unsigned long *ptr = pmdp->pmd;
 112         short i = 16;
 113         while (--i >= 0) {
 114                 *ptr++ = ptbl;
 115                 ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
 116         }
 117 }
 118
 119 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
 120 {
 121         pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
 122 }
 123
 124 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
 125 #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
 126 #define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
 127
 128
 129 #define pte_none(pte)           (!pte_val(pte))
 130 #define pte_present(pte)        (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 131 #define pte_clear(mm,addr,ptep)         ({ pte_val(*(ptep)) = 0; })
 132
 133 #define pte_page(pte)           virt_to_page(__va(pte_val(pte)))
 134 #define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
 135 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 136
 137 #define pmd_none(pmd)           (!pmd_val(pmd))
 138 #define pmd_bad(pmd)            ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 139 #define pmd_present(pmd)        (pmd_val(pmd) & _PAGE_TABLE)
 140 #define pmd_clear(pmdp) ({                      \
 141         unsigned long *__ptr = pmdp->pmd;       \
 142         short __i = 16;                         \
 143         while (--__i >= 0)                      \
 144                 *__ptr++ = 0;                   \
 145 })
 146 #define pmd_page(pmd)           virt_to_page(__va(pmd_val(pmd)))
 147
 148
 149 #define pgd_none(pgd)           (!pgd_val(pgd))
 150 #define pgd_bad(pgd)            ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 151 #define pgd_present(pgd)        (pgd_val(pgd) & _PAGE_TABLE)
 152 #define pgd_clear(pgdp)         ({ pgd_val(*pgdp) = 0; })
 153 #define pgd_page(pgd)           (mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))
 154
 155 #define pte_ERROR(e) \
 156         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 157 #define pmd_ERROR(e) \
 158         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 159 #define pgd_ERROR(e) \
 160         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 161
 162
 163 /*
 164  * The following only work if pte_present() is true.
 165  * Undefined behaviour if not..
 166  */
 167 static inline int pte_write(pte_t pte)          { return !(pte_val(pte) & _PAGE_RONLY); }
 168 static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 169 static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 170 static inline int pte_file(pte_t pte)           { return pte_val(pte) & _PAGE_FILE; }
 171 static inline int pte_special(pte_t pte)        { return 0; }
 172
 173 static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) |= _PAGE_RONLY; return pte; }
 174 static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
 175 static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 176 static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
 177 static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
 178 static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 179 static inline pte_t pte_mknocache(pte_t pte)
 180 {
 181         pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
 182         return pte;
 183 }
 184 static inline pte_t pte_mkcache(pte_t pte)
 185 {
 186         pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
 187         return pte;
 188 }
 189 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 190
 191 #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
 192
 193 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
 194
 195 /* to find an entry in a page-table-directory */
 196 static inline pgd_t *pgd_offset(const struct mm_struct *mm,
 197                                 unsigned long address)
 198 {
 199         return mm->pgd + pgd_index(address);
 200 }
 201
 202 #define swapper_pg_dir kernel_pg_dir
 203 extern pgd_t kernel_pg_dir[128];
 204
 205 static inline pgd_t *pgd_offset_k(unsigned long address)
 206 {
 207         return kernel_pg_dir + (address >> PGDIR_SHIFT);
 208 }
 209
 210
 211 /* Find an entry in the second-level page table.. */
 212 static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
 213 {
 214         return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
 215 }
 216
 217 /* Find an entry in the third-level page table.. */
 218 static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address)
 219 {
 220         return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 221 }
 222
 223 #define pte_offset_map(pmdp,address) ((pte_t *)__pmd_page(*pmdp) + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
 224 #define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address)
 225 #define pte_unmap(pte)          ((void)0)
 226 #define pte_unmap_nested(pte)   ((void)0)
 227
 228 /*
 229  * Allocate and free page tables. The xxx_kernel() versions are
 230  * used to allocate a kernel page table - this turns on ASN bits
 231  * if any.
 232  */
 233
 234 /* Prior to calling these routines, the page should have been flushed
 235  * from both the cache and ATC, or the CPU might not notice that the
 236  * cache setting for the page has been changed. -jskov
 237  */
 238 static inline void nocache_page(void *vaddr)
 239 {
 240         unsigned long addr = (unsigned long)vaddr;
 241
 242         if (CPU_IS_040_OR_060) {
 243                 pgd_t *dir;
 244                 pmd_t *pmdp;
 245                 pte_t *ptep;
 246
 247                 dir = pgd_offset_k(addr);
 248                 pmdp = pmd_offset(dir, addr);
 249                 ptep = pte_offset_kernel(pmdp, addr);
 250                 *ptep = pte_mknocache(*ptep);
 251         }
 252 }
 253
 254 static inline void cache_page(void *vaddr)
 255 {
 256         unsigned long addr = (unsigned long)vaddr;
 257
 258         if (CPU_IS_040_OR_060) {
 259                 pgd_t *dir;
 260                 pmd_t *pmdp;
 261                 pte_t *ptep;
 262
 263                 dir = pgd_offset_k(addr);
 264                 pmdp = pmd_offset(dir, addr);
 265                 ptep = pte_offset_kernel(pmdp, addr);
 266                 *ptep = pte_mkcache(*ptep);
 267         }
 268 }
 269
 270 #define PTE_FILE_MAX_BITS       28
 271
 272 static inline unsigned long pte_to_pgoff(pte_t pte)
 273 {
 274         return pte.pte >> 4;
 275 }
 276
 277 static inline pte_t pgoff_to_pte(unsigned off)
 278 {
 279         pte_t pte = { (off << 4) + _PAGE_FILE };
 280         return pte;
 281 }
 282
 283 /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
 284 #define __swp_type(x)           (((x).val >> 4) & 0xff)
 285 #define __swp_offset(x)         ((x).val >> 12)
 286 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
 287 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 288 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 289
 290 #endif  /* !__ASSEMBLY__ */
 291 #endif /* _MOTOROLA_PGTABLE_H */