arch/m68k/include/asm/motorola_pgtable.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _MOTOROLA_PGTABLE_H
   3 #define _MOTOROLA_PGTABLE_H
   4
   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_READWRITE 0x000
  13 #define _PAGE_ACCESSED  0x008
  14 #define _PAGE_DIRTY     0x010
  15 #define _PAGE_SUPER     0x080   /* 68040 supervisor only */
  16 #define _PAGE_GLOBAL040 0x400   /* 68040 global bit, used for kva descs */
  17 #define _PAGE_NOCACHE030 0x040  /* 68030 no-cache mode */
  18 #define _PAGE_NOCACHE   0x060   /* 68040 cache mode, non-serialized */
  19 #define _PAGE_NOCACHE_S 0x040   /* 68040 no-cache mode, serialized */
  20 #define _PAGE_CACHE040  0x020   /* 68040 cache mode, cachable, copyback */
  21 #define _PAGE_CACHE040W 0x000   /* 68040 cache mode, cachable, write-through */
  22
  23 #define _DESCTYPE_MASK  0x003
  24
  25 #define _CACHEMASK040   (~0x060)
  26 #define _TABLE_MASK     (0xfffffe00)
  27
  28 #define _PAGE_TABLE     (_PAGE_SHORT)
  29 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
  30
  31 #define _PAGE_PROTNONE  0x004
  32
  33 #ifndef __ASSEMBLY__
  34
  35 /* This is the cache mode to be used for pages containing page descriptors for
  36  * processors >= '040. It is in pte_mknocache(), and the variable is defined
  37  * and initialized in head.S */
  38 extern int m68k_pgtable_cachemode;
  39
  40 /* This is the cache mode for normal pages, for supervisor access on
  41  * processors >= '040. It is used in pte_mkcache(), and the variable is
  42  * defined and initialized in head.S */
  43
  44 #if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
  45 #define m68k_supervisor_cachemode _PAGE_CACHE040W
  46 #elif defined(CPU_M68040_OR_M68060_ONLY)
  47 #define m68k_supervisor_cachemode _PAGE_CACHE040
  48 #elif defined(CPU_M68020_OR_M68030_ONLY)
  49 #define m68k_supervisor_cachemode 0
  50 #else
  51 extern int m68k_supervisor_cachemode;
  52 #endif
  53
  54 #if defined(CPU_M68040_OR_M68060_ONLY)
  55 #define mm_cachebits _PAGE_CACHE040
  56 #elif defined(CPU_M68020_OR_M68030_ONLY)
  57 #define mm_cachebits 0
  58 #else
  59 extern unsigned long mm_cachebits;
  60 #endif
  61
  62 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
  63 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
  64 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  65 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  66 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
  67
  68 /* Alternate definitions that are compile time constants, for
  69    initializing protection_map.  The cachebits are fixed later.  */
  70 #define PAGE_NONE_C     __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  71 #define PAGE_SHARED_C   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
  72 #define PAGE_COPY_C     __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  73 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  74
  75 /*
  76  * The m68k can't do page protection for execute, and considers that the same are read.
  77  * Also, write permissions imply read permissions. This is the closest we can get..
  78  */
  79 #define __P000  PAGE_NONE_C
  80 #define __P001  PAGE_READONLY_C
  81 #define __P010  PAGE_COPY_C
  82 #define __P011  PAGE_COPY_C
  83 #define __P100  PAGE_READONLY_C
  84 #define __P101  PAGE_READONLY_C
  85 #define __P110  PAGE_COPY_C
  86 #define __P111  PAGE_COPY_C
  87
  88 #define __S000  PAGE_NONE_C
  89 #define __S001  PAGE_READONLY_C
  90 #define __S010  PAGE_SHARED_C
  91 #define __S011  PAGE_SHARED_C
  92 #define __S100  PAGE_READONLY_C
  93 #define __S101  PAGE_READONLY_C
  94 #define __S110  PAGE_SHARED_C
  95 #define __S111  PAGE_SHARED_C
  96
  97 /*
  98  * Conversion functions: convert a page and protection to a page entry,
  99  * and a page entry and page directory to the page they refer to.
 100  */
 101 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
 102
 103 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 104 {
 105         pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
 106         return pte;
 107 }
 108
 109 static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
 110 {
 111         unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
 112         unsigned long *ptr = pmdp->pmd;
 113         short i = 16;
 114         while (--i >= 0) {
 115                 *ptr++ = ptbl;
 116                 ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
 117         }
 118 }
 119
 120 static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
 121 {
 122         pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
 123 }
 124
 125 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
 126 #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
 127 #define pud_page_vaddr(pud) ((unsigned long)__va(pud_val(pud) & _TABLE_MASK))
 128
 129
 130 #define pte_none(pte)           (!pte_val(pte))
 131 #define pte_present(pte)        (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 132 #define pte_clear(mm,addr,ptep)         ({ pte_val(*(ptep)) = 0; })
 133
 134 #define pte_page(pte)           virt_to_page(__va(pte_val(pte)))
 135 #define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
 136 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 137
 138 #define pmd_none(pmd)           (!pmd_val(pmd))
 139 #define pmd_bad(pmd)            ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 140 #define pmd_present(pmd)        (pmd_val(pmd) & _PAGE_TABLE)
 141 #define pmd_clear(pmdp) ({                      \
 142         unsigned long *__ptr = pmdp->pmd;       \
 143         short __i = 16;                         \
 144         while (--__i >= 0)                      \
 145                 *__ptr++ = 0;                   \
 146 })
 147 #define pmd_page(pmd)           virt_to_page(__va(pmd_val(pmd)))
 148
 149
 150 #define pud_none(pud)           (!pud_val(pud))
 151 #define pud_bad(pud)            ((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE)
 152 #define pud_present(pud)        (pud_val(pud) & _PAGE_TABLE)
 153 #define pud_clear(pudp)         ({ pud_val(*pudp) = 0; })
 154 #define pud_page(pud)           (mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT))
 155
 156 #define pte_ERROR(e) \
 157         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 158 #define pmd_ERROR(e) \
 159         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 160 #define pgd_ERROR(e) \
 161         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 162
 163
 164 /*
 165  * The following only work if pte_present() is true.
 166  * Undefined behaviour if not..
 167  */
 168 static inline int pte_write(pte_t pte)          { return !(pte_val(pte) & _PAGE_RONLY); }
 169 static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 170 static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 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(pud_t *dir, unsigned long address)
 213 {
 214         return (pmd_t *)pud_page_vaddr(*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_unmap(pte)          ((void)0)
 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(void *vaddr)
 237 {
 238         unsigned long addr = (unsigned long)vaddr;
 239
 240         if (CPU_IS_040_OR_060) {
 241                 pgd_t *dir;
 242                 p4d_t *p4dp;
 243                 pud_t *pudp;
 244                 pmd_t *pmdp;
 245                 pte_t *ptep;
 246
 247                 dir = pgd_offset_k(addr);
 248                 p4dp = p4d_offset(dir, addr);
 249                 pudp = pud_offset(p4dp, addr);
 250                 pmdp = pmd_offset(pudp, addr);
 251                 ptep = pte_offset_kernel(pmdp, addr);
 252                 *ptep = pte_mknocache(*ptep);
 253         }
 254 }
 255
 256 static inline void cache_page(void *vaddr)
 257 {
 258         unsigned long addr = (unsigned long)vaddr;
 259
 260         if (CPU_IS_040_OR_060) {
 261                 pgd_t *dir;
 262                 p4d_t *p4dp;
 263                 pud_t *pudp;
 264                 pmd_t *pmdp;
 265                 pte_t *ptep;
 266
 267                 dir = pgd_offset_k(addr);
 268                 p4dp = p4d_offset(dir, addr);
 269                 pudp = pud_offset(p4dp, addr);
 270                 pmdp = pmd_offset(pudp, addr);
 271                 ptep = pte_offset_kernel(pmdp, addr);
 272                 *ptep = pte_mkcache(*ptep);
 273         }
 274 }
 275
 276 /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
 277 #define __swp_type(x)           (((x).val >> 4) & 0xff)
 278 #define __swp_offset(x)         ((x).val >> 12)
 279 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
 280 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 281 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 282
 283 #endif  /* !__ASSEMBLY__ */
 284 #endif /* _MOTOROLA_PGTABLE_H */