include/asm-m68k/motorola_pgtable.h

   1 #ifndef _MOTOROLA_PGTABLE_H
   2 #define _MOTOROLA_PGTABLE_H
   3
   4 /*
   5  * Definitions for MMU descriptors
   6  */
   7 #define _PAGE_PRESENT   0x001
   8 #define _PAGE_SHORT     0x002
   9 #define _PAGE_RONLY     0x004
  10 #define _PAGE_ACCESSED  0x008
  11 #define _PAGE_DIRTY     0x010
  12 #define _PAGE_SUPER     0x080   /* 68040 supervisor only */
  13 #define _PAGE_FAKE_SUPER 0x200  /* fake supervisor only on 680[23]0 */
  14 #define _PAGE_GLOBAL040 0x400   /* 68040 global bit, used for kva descs */
  15 #define _PAGE_COW       0x800   /* implemented in software */
  16 #define _PAGE_NOCACHE030 0x040  /* 68030 no-cache mode */
  17 #define _PAGE_NOCACHE   0x060   /* 68040 cache mode, non-serialized */
  18 #define _PAGE_NOCACHE_S 0x040   /* 68040 no-cache mode, serialized */
  19 #define _PAGE_CACHE040  0x020   /* 68040 cache mode, cachable, copyback */
  20 #define _PAGE_CACHE040W 0x000   /* 68040 cache mode, cachable, write-through */
  21
  22 #define _DESCTYPE_MASK  0x003
  23
  24 #define _CACHEMASK040   (~0x060)
  25 #define _TABLE_MASK     (0xfffffe00)
  26
  27 #define _PAGE_TABLE     (_PAGE_SHORT)
  28 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
  29
  30 #ifndef __ASSEMBLY__
  31
  32 /* This is the cache mode to be used for pages containing page descriptors for
  33  * processors >= '040. It is in pte_mknocache(), and the variable is defined
  34  * and initialized in head.S */
  35 extern int m68k_pgtable_cachemode;
  36
  37 /* This is the cache mode for normal pages, for supervisor access on
  38  * processors >= '040. It is used in pte_mkcache(), and the variable is
  39  * defined and initialized in head.S */
  40
  41 #if defined(CONFIG_060_WRITETHROUGH)
  42 extern int m68k_supervisor_cachemode;
  43 #else
  44 #define m68k_supervisor_cachemode _PAGE_CACHE040
  45 #endif
  46
  47 #if defined(CPU_M68040_OR_M68060_ONLY)
  48 #define mm_cachebits _PAGE_CACHE040
  49 #elif defined(CPU_M68020_OR_M68030_ONLY)
  50 #define mm_cachebits 0
  51 #else
  52 extern unsigned long mm_cachebits;
  53 #endif
  54
  55 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  56 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
  57 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  58 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  59 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
  60
  61 /* Alternate definitions that are compile time constants, for
  62    initializing protection_map.  The cachebits are fixed later.  */
  63 #define PAGE_NONE_C     __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  64 #define PAGE_SHARED_C   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
  65 #define PAGE_COPY_C     __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  66 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  67
  68 /*
  69  * The m68k can't do page protection for execute, and considers that the same are read.
  70  * Also, write permissions imply read permissions. This is the closest we can get..
  71  */
  72 #define __P000  PAGE_NONE_C
  73 #define __P001  PAGE_READONLY_C
  74 #define __P010  PAGE_COPY_C
  75 #define __P011  PAGE_COPY_C
  76 #define __P100  PAGE_READONLY_C
  77 #define __P101  PAGE_READONLY_C
  78 #define __P110  PAGE_COPY_C
  79 #define __P111  PAGE_COPY_C
  80
  81 #define __S000  PAGE_NONE_C
  82 #define __S001  PAGE_READONLY_C
  83 #define __S010  PAGE_SHARED_C
  84 #define __S011  PAGE_SHARED_C
  85 #define __S100  PAGE_READONLY_C
  86 #define __S101  PAGE_READONLY_C
  87 #define __S110  PAGE_SHARED_C
  88 #define __S111  PAGE_SHARED_C
  89
  90 /*
  91  * Conversion functions: convert a page and protection to a page entry,
  92  * and a page entry and page directory to the page they refer to.
  93  */
  94 #define __mk_pte(page, pgprot) \
  95 ({                                                                      \
  96         pte_t __pte;                                                    \
  97                                                                         \
  98         pte_val(__pte) = __pa(page) + pgprot_val(pgprot);               \
  99         __pte;                                                          \
 100 })
 101 #define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot))
 102 #define mk_pte_phys(physpage, pgprot) \
 103 ({                                                                      \
 104         pte_t __pte;                                                    \
 105                                                                         \
 106         pte_val(__pte) = (physpage) + pgprot_val(pgprot);               \
 107         __pte;                                                          \
 108 })
 109
 110 extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 111 { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
 112
 113 extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
 114 {
 115         unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
 116         unsigned long *ptr = pmdp->pmd;
 117         short i = 16;
 118         while (--i >= 0) {
 119                 *ptr++ = ptbl;
 120                 ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
 121         }
 122 }
 123
 124 extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp)
 125 { pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp); }
 126
 127 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
 128 #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
 129 #define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
 130
 131
 132 #define pte_none(pte)           (!pte_val(pte))
 133 #define pte_present(pte)        (pte_val(pte) & (_PAGE_PRESENT | _PAGE_FAKE_SUPER))
 134 #define pte_clear(ptep)         ({ pte_val(*(ptep)) = 0; })
 135 #define pte_pagenr(pte)         ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
 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
 147
 148 #define pgd_none(pgd)           (!pgd_val(pgd))
 149 #define pgd_bad(pgd)            ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 150 #define pgd_present(pgd)        (pgd_val(pgd) & _PAGE_TABLE)
 151 #define pgd_clear(pgdp)         ({ pgd_val(*pgdp) = 0; })
 152 /* Permanent address of a page. */
 153 #define page_address(page)      ({ if (!(page)->virtual) BUG(); (page)->virtual; })
 154 #define __page_address(page)    (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
 155 #define pte_page(pte)           (mem_map+pte_pagenr(pte))
 156
 157 #define pte_ERROR(e) \
 158         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 159 #define pmd_ERROR(e) \
 160         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 161 #define pgd_ERROR(e) \
 162         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 163
 164
 165 /*
 166  * The following only work if pte_present() is true.
 167  * Undefined behaviour if not..
 168  */
 169 extern inline int pte_read(pte_t pte)           { return 1; }
 170 extern inline int pte_write(pte_t pte)          { return !(pte_val(pte) & _PAGE_RONLY); }
 171 extern inline int pte_exec(pte_t pte)           { return 1; }
 172 extern inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 173 extern inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 174
 175 extern inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) |= _PAGE_RONLY; return pte; }
 176 extern inline pte_t pte_rdprotect(pte_t pte)    { return pte; }
 177 extern inline pte_t pte_exprotect(pte_t pte)    { return pte; }
 178 extern inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
 179 extern inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 180 extern inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
 181 extern inline pte_t pte_mkread(pte_t pte)       { return pte; }
 182 extern inline pte_t pte_mkexec(pte_t pte)       { return pte; }
 183 extern inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
 184 extern inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 185 extern inline pte_t pte_mknocache(pte_t pte)
 186 {
 187         pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
 188         return pte;
 189 }
 190 extern inline pte_t pte_mkcache(pte_t pte)      { pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; return pte; }
 191
 192 #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
 193
 194 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
 195
 196 /* to find an entry in a page-table-directory */
 197 extern inline pgd_t * pgd_offset(struct mm_struct * mm, 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 extern 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 extern 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 extern inline pte_t * pte_offset(pmd_t * pmdp, unsigned long address)
 219 {
 220         return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 221 }
 222
 223
 224 /*
 225  * Allocate and free page tables. The xxx_kernel() versions are
 226  * used to allocate a kernel page table - this turns on ASN bits
 227  * if any.
 228  */
 229
 230 /* Prior to calling these routines, the page should have been flushed
 231  * from both the cache and ATC, or the CPU might not notice that the
 232  * cache setting for the page has been changed. -jskov
 233  */
 234 static inline void nocache_page (unsigned long vaddr)
 235 {
 236         if (CPU_IS_040_OR_060) {
 237                 pgd_t *dir;
 238                 pmd_t *pmdp;
 239                 pte_t *ptep;
 240
 241                 dir = pgd_offset_k(vaddr);
 242                 pmdp = pmd_offset(dir,vaddr);
 243                 ptep = pte_offset(pmdp,vaddr);
 244                 *ptep = pte_mknocache(*ptep);
 245         }
 246 }
 247
 248 static inline void cache_page (unsigned long vaddr)
 249 {
 250         if (CPU_IS_040_OR_060) {
 251                 pgd_t *dir;
 252                 pmd_t *pmdp;
 253                 pte_t *ptep;
 254
 255                 dir = pgd_offset_k(vaddr);
 256                 pmdp = pmd_offset(dir,vaddr);
 257                 ptep = pte_offset(pmdp,vaddr);
 258                 *ptep = pte_mkcache(*ptep);
 259         }
 260 }
 261
 262
 263 #endif  /* !__ASSEMBLY__ */
 264 #endif /* _MOTOROLA_PGTABLE_H */