include/asm-m68k/motorola_pgtable.h

   1 #ifndef _MOTOROLA_PGTABLE_H
   2 #define _MOTOROLA_PGTABLE_H
   3
   4 #include <linux/config.h>
   5
   6 /*
   7  * Definitions for MMU descriptors
   8  */
   9 #define _PAGE_PRESENT   0x001
  10 #define _PAGE_SHORT     0x002
  11 #define _PAGE_RONLY     0x004
  12 #define _PAGE_ACCESSED  0x008
  13 #define _PAGE_DIRTY     0x010
  14 #define _PAGE_SUPER     0x080   /* 68040 supervisor only */
  15 #define _PAGE_FAKE_SUPER 0x200  /* fake supervisor only on 680[23]0 */
  16 #define _PAGE_GLOBAL040 0x400   /* 68040 global bit, used for kva descs */
  17 #define _PAGE_COW       0x800   /* implemented in software */
  18 #define _PAGE_NOCACHE030 0x040  /* 68030 no-cache mode */
  19 #define _PAGE_NOCACHE   0x060   /* 68040 cache mode, non-serialized */
  20 #define _PAGE_NOCACHE_S 0x040   /* 68040 no-cache mode, serialized */
  21 #define _PAGE_CACHE040  0x020   /* 68040 cache mode, cachable, copyback */
  22 #define _PAGE_CACHE040W 0x000   /* 68040 cache mode, cachable, write-through */
  23
  24 #define _DESCTYPE_MASK  0x003
  25
  26 #define _CACHEMASK040   (~0x060)
  27 #define _TABLE_MASK     (0xfffffe00)
  28
  29 #define _PAGE_TABLE     (_PAGE_SHORT)
  30 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
  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(CONFIG_060_WRITETHROUGH)
  44 extern int m68k_supervisor_cachemode;
  45 #else
  46 #define m68k_supervisor_cachemode _PAGE_CACHE040
  47 #endif
  48
  49 #if defined(CPU_M68040_OR_M68060_ONLY)
  50 #define mm_cachebits _PAGE_CACHE040
  51 #elif defined(CPU_M68020_OR_M68030_ONLY)
  52 #define mm_cachebits 0
  53 #else
  54 extern unsigned long mm_cachebits;
  55 #endif
  56
  57 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  58 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
  59 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  60 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  61 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
  62
  63 /* Alternate definitions that are compile time constants, for
  64    initializing protection_map.  The cachebits are fixed later.  */
  65 #define PAGE_NONE_C     __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  66 #define PAGE_SHARED_C   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
  67 #define PAGE_COPY_C     __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  68 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  69
  70 /*
  71  * The m68k can't do page protection for execute, and considers that the same are read.
  72  * Also, write permissions imply read permissions. This is the closest we can get..
  73  */
  74 #define __P000  PAGE_NONE_C
  75 #define __P001  PAGE_READONLY_C
  76 #define __P010  PAGE_COPY_C
  77 #define __P011  PAGE_COPY_C
  78 #define __P100  PAGE_READONLY_C
  79 #define __P101  PAGE_READONLY_C
  80 #define __P110  PAGE_COPY_C
  81 #define __P111  PAGE_COPY_C
  82
  83 #define __S000  PAGE_NONE_C
  84 #define __S001  PAGE_READONLY_C
  85 #define __S010  PAGE_SHARED_C
  86 #define __S011  PAGE_SHARED_C
  87 #define __S100  PAGE_READONLY_C
  88 #define __S101  PAGE_READONLY_C
  89 #define __S110  PAGE_SHARED_C
  90 #define __S111  PAGE_SHARED_C
  91
  92 /*
  93  * Conversion functions: convert a page and protection to a page entry,
  94  * and a page entry and page directory to the page they refer to.
  95  */
  96 #define __mk_pte(page, pgprot) \
  97 ({                                                                      \
  98         pte_t __pte;                                                    \
  99                                                                         \
 100         pte_val(__pte) = __pa(page) + pgprot_val(pgprot);               \
 101         __pte;                                                          \
 102 })
 103 #define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot))
 104 #define mk_pte_phys(physpage, pgprot) \
 105 ({                                                                      \
 106         pte_t __pte;                                                    \
 107                                                                         \
 108         pte_val(__pte) = (physpage) + pgprot_val(pgprot);               \
 109         __pte;                                                          \
 110 })
 111
 112 extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 113 { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
 114
 115 extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
 116 {
 117         unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
 118         unsigned long *ptr = pmdp->pmd;
 119         short i = 16;
 120         while (--i >= 0) {
 121                 *ptr++ = ptbl;
 122                 ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
 123         }
 124 }
 125
 126 extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp)
 127 { pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp); }
 128
 129 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
 130 #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
 131 #define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
 132
 133
 134 #define pte_none(pte)           (!pte_val(pte))
 135 #define pte_present(pte)        (pte_val(pte) & (_PAGE_PRESENT | _PAGE_FAKE_SUPER))
 136 #define pte_clear(ptep)         ({ pte_val(*(ptep)) = 0; })
 137 #define pte_pagenr(pte)         ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
 138
 139 #define pmd_none(pmd)           (!pmd_val(pmd))
 140 #define pmd_bad(pmd)            ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 141 #define pmd_present(pmd)        (pmd_val(pmd) & _PAGE_TABLE)
 142 #define pmd_clear(pmdp) ({                      \
 143         unsigned long *__ptr = pmdp->pmd;       \
 144         short __i = 16;                         \
 145         while (--__i >= 0)                      \
 146                 *__ptr++ = 0;                   \
 147 })
 148
 149
 150 #define pgd_none(pgd)           (!pgd_val(pgd))
 151 #define pgd_bad(pgd)            ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 152 #define pgd_present(pgd)        (pgd_val(pgd) & _PAGE_TABLE)
 153 #define pgd_clear(pgdp)         ({ pgd_val(*pgdp) = 0; })
 154 /* Permanent address of a page. */
 155 #define page_address(page)      ({ if (!(page)->virtual) BUG(); (page)->virtual; })
 156 #define __page_address(page)    (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
 157 #define pte_page(pte)           (mem_map+pte_pagenr(pte))
 158
 159 #define pte_ERROR(e) \
 160         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 161 #define pmd_ERROR(e) \
 162         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 163 #define pgd_ERROR(e) \
 164         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 165
 166
 167 /*
 168  * The following only work if pte_present() is true.
 169  * Undefined behaviour if not..
 170  */
 171 extern inline int pte_read(pte_t pte)           { return 1; }
 172 extern inline int pte_write(pte_t pte)          { return !(pte_val(pte) & _PAGE_RONLY); }
 173 extern inline int pte_exec(pte_t pte)           { return 1; }
 174 extern inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 175 extern inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 176
 177 extern inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) |= _PAGE_RONLY; return pte; }
 178 extern inline pte_t pte_rdprotect(pte_t pte)    { return pte; }
 179 extern inline pte_t pte_exprotect(pte_t pte)    { return pte; }
 180 extern inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
 181 extern inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 182 extern inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
 183 extern inline pte_t pte_mkread(pte_t pte)       { return pte; }
 184 extern inline pte_t pte_mkexec(pte_t pte)       { return pte; }
 185 extern inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
 186 extern inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 187 extern inline pte_t pte_mknocache(pte_t pte)
 188 {
 189         pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
 190         return pte;
 191 }
 192 extern inline pte_t pte_mkcache(pte_t pte)      { pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; return pte; }
 193
 194 #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
 195
 196 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
 197
 198 /* to find an entry in a page-table-directory */
 199 extern inline pgd_t * pgd_offset(struct mm_struct * mm, unsigned long address)
 200 {
 201         return mm->pgd + pgd_index(address);
 202 }
 203
 204 #define swapper_pg_dir kernel_pg_dir
 205 extern pgd_t kernel_pg_dir[128];
 206
 207 extern inline pgd_t * pgd_offset_k(unsigned long address)
 208 {
 209         return kernel_pg_dir + (address >> PGDIR_SHIFT);
 210 }
 211
 212
 213 /* Find an entry in the second-level page table.. */
 214 extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
 215 {
 216         return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
 217 }
 218
 219 /* Find an entry in the third-level page table.. */
 220 extern inline pte_t * pte_offset(pmd_t * pmdp, unsigned long address)
 221 {
 222         return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 223 }
 224
 225
 226 /*
 227  * Allocate and free page tables. The xxx_kernel() versions are
 228  * used to allocate a kernel page table - this turns on ASN bits
 229  * if any.
 230  */
 231
 232 /* Prior to calling these routines, the page should have been flushed
 233  * from both the cache and ATC, or the CPU might not notice that the
 234  * cache setting for the page has been changed. -jskov
 235  */
 236 static inline void nocache_page (unsigned long vaddr)
 237 {
 238         if (CPU_IS_040_OR_060) {
 239                 pgd_t *dir;
 240                 pmd_t *pmdp;
 241                 pte_t *ptep;
 242
 243                 dir = pgd_offset_k(vaddr);
 244                 pmdp = pmd_offset(dir,vaddr);
 245                 ptep = pte_offset(pmdp,vaddr);
 246                 *ptep = pte_mknocache(*ptep);
 247         }
 248 }
 249
 250 static inline void cache_page (unsigned long vaddr)
 251 {
 252         if (CPU_IS_040_OR_060) {
 253                 pgd_t *dir;
 254                 pmd_t *pmdp;
 255                 pte_t *ptep;
 256
 257                 dir = pgd_offset_k(vaddr);
 258                 pmdp = pmd_offset(dir,vaddr);
 259                 ptep = pte_offset(pmdp,vaddr);
 260                 *ptep = pte_mkcache(*ptep);
 261         }
 262 }
 263
 264
 265 #endif  /* !__ASSEMBLY__ */
 266 #endif /* _MOTOROLA_PGTABLE_H */