LXR linux/arch/m68k/include/asm/motorola

   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 */
  49extern 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
  62extern 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
  70extern 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#define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd))
 109
 110/*
 111 * Conversion functions: convert a page and protection to a page entry,
 112 * and a page entry and page directory to the page they refer to.
 113 */
 114#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
 115
 116static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 117{
 118        pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
 119        return pte;
 120}
 121
 122static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
 123{
 124        pmd_val(*pmdp) = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
 125}
 126
 127static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
 128{
 129        pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
 130}
 131
 132#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
 133#define pmd_page_vaddr(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
 134#define pud_pgtable(pud) ((pmd_t *)__va(pud_val(pud) & _TABLE_MASK))
 135
 136
 137#define pte_none(pte)           (!pte_val(pte))
 138#define pte_present(pte)        (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 139#define pte_clear(mm,addr,ptep)         ({ pte_val(*(ptep)) = 0; })
 140
 141#define pte_page(pte)           virt_to_page(__va(pte_val(pte)))
 142#define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
 143#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 144
 145#define pmd_none(pmd)           (!pmd_val(pmd))
 146#define pmd_bad(pmd)            ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
 147#define pmd_present(pmd)        (pmd_val(pmd) & _PAGE_TABLE)
 148#define pmd_clear(pmdp)         ({ pmd_val(*pmdp) = 0; })
 149
 150/*
 151 * m68k does not have huge pages (020/030 actually could), but generic code
 152 * expects pmd_page() to exists, only to then DCE it all. Provide a dummy to
 153 * make the compiler happy.
 154 */
 155#define pmd_page(pmd)           NULL
 156
 157
 158#define pud_none(pud)           (!pud_val(pud))
 159#define pud_bad(pud)            ((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE)
 160#define pud_present(pud)        (pud_val(pud) & _PAGE_TABLE)
 161#define pud_clear(pudp)         ({ pud_val(*pudp) = 0; })
 162#define pud_page(pud)           (mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT))
 163
 164#define pte_ERROR(e) \
 165        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 166#define pmd_ERROR(e) \
 167        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 168#define pgd_ERROR(e) \
 169        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 170
 171
 172/*
 173 * The following only work if pte_present() is true.
 174 * Undefined behaviour if not..
 175 */
 176static inline int pte_write(pte_t pte)          { return !(pte_val(pte) & _PAGE_RONLY); }
 177static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 178static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 179
 180static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) |= _PAGE_RONLY; return pte; }
 181static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
 182static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 183static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
 184static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
 185static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 186static inline pte_t pte_mknocache(pte_t pte)
 187{
 188        pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
 189        return pte;
 190}
 191static inline pte_t pte_mkcache(pte_t pte)
 192{
 193        pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
 194        return pte;
 195}
 196
 197#define swapper_pg_dir kernel_pg_dir
 198extern pgd_t kernel_pg_dir[128];
 199
 200/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
 201#define __swp_type(x)           (((x).val >> 4) & 0xff)
 202#define __swp_offset(x)         ((x).val >> 12)
 203#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
 204#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 205#define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 206
 207#endif  /* !__ASSEMBLY__ */
 208#endif /* _MOTOROLA_PGTABLE_H */
 209