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
  27 /*
  28  * Currently set to the minimum alignment of table pointers (256 bytes).
  29  * The hardware only uses the low 4 bits for state:
  30  *
  31  *    3 - Used
  32  *    2 - Write Protected
  33  *  0,1 - Descriptor Type
  34  *
  35  * and has the rest of the bits reserved.
  36  */
  37 #define _TABLE_MASK     (0xffffff00)
  38
  39 #define _PAGE_TABLE     (_PAGE_SHORT)
  40 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
  41
  42 #define _PAGE_PROTNONE  0x004
  43
  44 #ifndef __ASSEMBLY__
  45
  46 /* This is the cache mode to be used for pages containing page descriptors for
  47  * processors >= '040. It is in pte_mknocache(), and the variable is defined
  48  * and initialized in head.S */
  49 extern int m68k_pgtable_cachemode;
  50
  51 /* This is the cache mode for normal pages, for supervisor access on
  52  * processors >= '040. It is used in pte_mkcache(), and the variable is
  53  * defined and initialized in head.S */
  54
  55 #if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
  56 #define m68k_supervisor_cachemode _PAGE_CACHE040W
  57 #elif defined(CPU_M68040_OR_M68060_ONLY)
  58 #define m68k_supervisor_cachemode _PAGE_CACHE040
  59 #elif defined(CPU_M68020_OR_M68030_ONLY)
  60 #define m68k_supervisor_cachemode 0
  61 #else
  62 extern int m68k_supervisor_cachemode;
  63 #endif
  64
  65 #if defined(CPU_M68040_OR_M68060_ONLY)
  66 #define mm_cachebits _PAGE_CACHE040
  67 #elif defined(CPU_M68020_OR_M68030_ONLY)
  68 #define mm_cachebits 0
  69 #else
  70 extern unsigned long mm_cachebits;
  71 #endif
  72
  73 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
  74 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
  75 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  76 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
  77 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
  78
  79 /* Alternate definitions that are compile time constants, for
  80    initializing protection_map.  The cachebits are fixed later.  */
  81 #define PAGE_NONE_C     __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  82 #define PAGE_SHARED_C   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
  83 #define PAGE_COPY_C     __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  84 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
  85
  86 /*
  87  * The m68k can't do page protection for execute, and considers that the same are read.
  88  * Also, write permissions imply read permissions. This is the closest we can get..
  89  */
  90 #define __P000  PAGE_NONE_C
  91 #define __P001  PAGE_READONLY_C
  92 #define __P010  PAGE_COPY_C
  93 #define __P011  PAGE_COPY_C
  94 #define __P100  PAGE_READONLY_C
  95 #define __P101  PAGE_READONLY_C
  96 #define __P110  PAGE_COPY_C
  97 #define __P111  PAGE_COPY_C
  98
  99 #define __S000  PAGE_NONE_C
 100 #define __S001  PAGE_READONLY_C
 101 #define __S010  PAGE_SHARED_C
 102 #define __S011  PAGE_SHARED_C
 103 #define __S100  PAGE_READONLY_C
 104 #define __S101  PAGE_READONLY_C
 105 #define __S110  PAGE_SHARED_C
 106 #define __S111  PAGE_SHARED_C
 107
 108 /*
 109  * Conversion functions: convert a page and protection to a page entry,
 110  * and a page entry and page directory to the page they refer to.
 111  */
 112 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
 113
 114 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 115 {
 116         pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
 117         return pte;
 118 }
 119
 120 static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
 121 {
 122         pmd_val(*pmdp) = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
 123 }
 124
 125 static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
 126 {
 127         pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
 128 }
 129
 130 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
 131 #define pmd_page_vaddr(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
 132 #define pud_page_vaddr(pud) ((unsigned long)__va(pud_val(pud) & _TABLE_MASK))
 133
 134
 135 #define pte_none(pte)           (!pte_val(pte))
 136 #define pte_present(pte)        (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 137 #define pte_clear(mm,addr,ptep)         ({ pte_val(*(ptep)) = 0; })
 138
 139 #define pte_page(pte)           virt_to_page(__va(pte_val(pte)))
 140 #define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
 141 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 142
 143 #define pmd_none(pmd)           (!pmd_val(pmd))
 144 #define pmd_bad(pmd)            ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 145 #define pmd_present(pmd)        (pmd_val(pmd) & _PAGE_TABLE)
 146 #define pmd_clear(pmdp)         ({ pmd_val(*pmdp) = 0; })
 147
 148 /*
 149  * m68k does not have huge pages (020/030 actually could), but generic code
 150  * expects pmd_page() to exists, only to then DCE it all. Provide a dummy to
 151  * make the compiler happy.
 152  */
 153 #define pmd_page(pmd)           NULL
 154
 155
 156 #define pud_none(pud)           (!pud_val(pud))
 157 #define pud_bad(pud)            ((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE)
 158 #define pud_present(pud)        (pud_val(pud) & _PAGE_TABLE)
 159 #define pud_clear(pudp)         ({ pud_val(*pudp) = 0; })
 160 #define pud_page(pud)           (mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT))
 161
 162 #define pte_ERROR(e) \
 163         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 164 #define pmd_ERROR(e) \
 165         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 166 #define pgd_ERROR(e) \
 167         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 168
 169
 170 /*
 171  * The following only work if pte_present() is true.
 172  * Undefined behaviour if not..
 173  */
 174 static inline int pte_write(pte_t pte)          { return !(pte_val(pte) & _PAGE_RONLY); }
 175 static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 176 static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 177
 178 static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) |= _PAGE_RONLY; return pte; }
 179 static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
 180 static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 181 static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
 182 static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
 183 static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 184 static inline pte_t pte_mknocache(pte_t pte)
 185 {
 186         pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
 187         return pte;
 188 }
 189 static inline pte_t pte_mkcache(pte_t pte)
 190 {
 191         pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
 192         return pte;
 193 }
 194
 195 #define swapper_pg_dir kernel_pg_dir
 196 extern pgd_t kernel_pg_dir[128];
 197
 198 /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
 199 #define __swp_type(x)           (((x).val >> 4) & 0xff)
 200 #define __swp_offset(x)         ((x).val >> 12)
 201 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
 202 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 203 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 204
 205 #endif  /* !__ASSEMBLY__ */
 206 #endif /* _MOTOROLA_PGTABLE_H */