arch/m68k/include/asm/sun3_pgtable.h

   1 #ifndef _SUN3_PGTABLE_H
   2 #define _SUN3_PGTABLE_H
   3
   4 #include <asm/sun3mmu.h>
   5
   6 #ifndef __ASSEMBLY__
   7 #include <asm/virtconvert.h>
   8 #include <linux/linkage.h>
   9
  10 /*
  11  * This file contains all the things which change drastically for the sun3
  12  * pagetable stuff, to avoid making too much of a mess of the generic m68k
  13  * `pgtable.h'; this should only be included from the generic file. --m
  14  */
  15
  16 /* For virtual address to physical address conversion */
  17 #define VTOP(addr)      __pa(addr)
  18 #define PTOV(addr)      __va(addr)
  19
  20
  21 #endif  /* !__ASSEMBLY__ */
  22
  23 /* These need to be defined for compatibility although the sun3 doesn't use them */
  24 #define _PAGE_NOCACHE030 0x040
  25 #define _CACHEMASK040   (~0x060)
  26 #define _PAGE_NOCACHE_S 0x040
  27
  28 /* Page protection values within PTE. */
  29 #define SUN3_PAGE_VALID     (0x80000000)
  30 #define SUN3_PAGE_WRITEABLE (0x40000000)
  31 #define SUN3_PAGE_SYSTEM    (0x20000000)
  32 #define SUN3_PAGE_NOCACHE   (0x10000000)
  33 #define SUN3_PAGE_ACCESSED  (0x02000000)
  34 #define SUN3_PAGE_MODIFIED  (0x01000000)
  35
  36
  37 /* Externally used page protection values. */
  38 #define _PAGE_PRESENT   (SUN3_PAGE_VALID)
  39 #define _PAGE_ACCESSED  (SUN3_PAGE_ACCESSED)
  40
  41 #define PTE_FILE_MAX_BITS 28
  42
  43 /* Compound page protection values. */
  44 //todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix...
  45 // is it just PAGE_KERNEL and PAGE_SHARED?
  46 #define PAGE_NONE       __pgprot(SUN3_PAGE_VALID \
  47                                  | SUN3_PAGE_ACCESSED \
  48                                  | SUN3_PAGE_NOCACHE)
  49 #define PAGE_SHARED     __pgprot(SUN3_PAGE_VALID \
  50                                  | SUN3_PAGE_WRITEABLE \
  51                                  | SUN3_PAGE_ACCESSED \
  52                                  | SUN3_PAGE_NOCACHE)
  53 #define PAGE_COPY       __pgprot(SUN3_PAGE_VALID \
  54                                  | SUN3_PAGE_ACCESSED \
  55                                  | SUN3_PAGE_NOCACHE)
  56 #define PAGE_READONLY   __pgprot(SUN3_PAGE_VALID \
  57                                  | SUN3_PAGE_ACCESSED \
  58                                  | SUN3_PAGE_NOCACHE)
  59 #define PAGE_KERNEL     __pgprot(SUN3_PAGE_VALID \
  60                                  | SUN3_PAGE_WRITEABLE \
  61                                  | SUN3_PAGE_SYSTEM \
  62                                  | SUN3_PAGE_NOCACHE \
  63                                  | SUN3_PAGE_ACCESSED \
  64                                  | SUN3_PAGE_MODIFIED)
  65 #define PAGE_INIT       __pgprot(SUN3_PAGE_VALID \
  66                                  | SUN3_PAGE_WRITEABLE \
  67                                  | SUN3_PAGE_SYSTEM \
  68                                  | SUN3_PAGE_NOCACHE)
  69
  70 /*
  71  * Page protections for initialising protection_map. The sun3 has only two
  72  * protection settings, valid (implying read and execute) and writeable. These
  73  * are as close as we can get...
  74  */
  75 #define __P000  PAGE_NONE
  76 #define __P001  PAGE_READONLY
  77 #define __P010  PAGE_COPY
  78 #define __P011  PAGE_COPY
  79 #define __P100  PAGE_READONLY
  80 #define __P101  PAGE_READONLY
  81 #define __P110  PAGE_COPY
  82 #define __P111  PAGE_COPY
  83
  84 #define __S000  PAGE_NONE
  85 #define __S001  PAGE_READONLY
  86 #define __S010  PAGE_SHARED
  87 #define __S011  PAGE_SHARED
  88 #define __S100  PAGE_READONLY
  89 #define __S101  PAGE_READONLY
  90 #define __S110  PAGE_SHARED
  91 #define __S111  PAGE_SHARED
  92
  93 /* Use these fake page-protections on PMDs. */
  94 #define SUN3_PMD_VALID  (0x00000001)
  95 #define SUN3_PMD_MASK   (0x0000003F)
  96 #define SUN3_PMD_MAGIC  (0x0000002B)
  97
  98 #ifndef __ASSEMBLY__
  99
 100 /*
 101  * Conversion functions: convert a page and protection to a page entry,
 102  * and a page entry and page directory to the page they refer to.
 103  */
 104 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
 105
 106 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 107 {
 108         pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
 109         return pte;
 110 }
 111
 112 #define pmd_set(pmdp,ptep) do {} while (0)
 113
 114 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
 115 {
 116         pgd_val(*pgdp) = virt_to_phys(pmdp);
 117 }
 118
 119 #define __pte_page(pte) \
 120 ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
 121 #define __pmd_page(pmd) \
 122 ((unsigned long) __va (pmd_val (pmd) & PAGE_MASK))
 123
 124 static inline int pte_none (pte_t pte) { return !pte_val (pte); }
 125 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
 126 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 127 {
 128         pte_val (*ptep) = 0;
 129 }
 130
 131 #define pte_pfn(pte)            (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
 132 #define pfn_pte(pfn, pgprot) \
 133 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
 134
 135 #define pte_page(pte)           virt_to_page(__pte_page(pte))
 136 #define pmd_page(pmd)           virt_to_page(__pmd_page(pmd))
 137
 138
 139 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
 140 #define pmd_none(pmd) pmd_none2(&(pmd))
 141 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
 142 static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
 143 #define pmd_bad(pmd) pmd_bad2(&(pmd))
 144 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
 145 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
 146 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
 147 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
 148
 149 static inline int pgd_none (pgd_t pgd) { return 0; }
 150 static inline int pgd_bad (pgd_t pgd) { return 0; }
 151 static inline int pgd_present (pgd_t pgd) { return 1; }
 152 static inline void pgd_clear (pgd_t *pgdp) {}
 153
 154
 155 #define pte_ERROR(e) \
 156         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 157 #define pmd_ERROR(e) \
 158         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 159 #define pgd_ERROR(e) \
 160         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 161
 162
 163 /*
 164  * The following only work if pte_present() is true.
 165  * Undefined behaviour if not...
 166  * [we have the full set here even if they don't change from m68k]
 167  */
 168 static inline int pte_write(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
 169 static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
 170 static inline int pte_young(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
 171 static inline int pte_file(pte_t pte)           { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
 172 static inline int pte_special(pte_t pte)        { return 0; }
 173
 174 static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
 175 static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
 176 static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
 177 static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
 178 static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
 179 static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
 180 static inline pte_t pte_mknocache(pte_t pte)    { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
 181 // use this version when caches work...
 182 //static inline pte_t pte_mkcache(pte_t pte)    { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
 183 // until then, use:
 184 static inline pte_t pte_mkcache(pte_t pte)      { return pte; }
 185 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 186
 187 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 188 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
 189
 190 /* Find an entry in a pagetable directory. */
 191 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
 192
 193 #define pgd_offset(mm, address) \
 194 ((mm)->pgd + pgd_index(address))
 195
 196 /* Find an entry in a kernel pagetable directory. */
 197 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 198
 199 /* Find an entry in the second-level pagetable. */
 200 static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
 201 {
 202         return (pmd_t *) pgd;
 203 }
 204
 205 static inline unsigned long pte_to_pgoff(pte_t pte)
 206 {
 207         return pte.pte & SUN3_PAGE_PGNUM_MASK;
 208 }
 209
 210 static inline pte_t pgoff_to_pte(unsigned off)
 211 {
 212         pte_t pte = { off + SUN3_PAGE_ACCESSED };
 213         return pte;
 214 }
 215
 216
 217 /* Find an entry in the third-level pagetable. */
 218 #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
 219 #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
 220 #define pte_offset_map(pmd, address) ((pte_t *)page_address(pmd_page(*pmd)) + pte_index(address))
 221 #define pte_unmap(pte) do { } while (0)
 222
 223 /* Macros to (de)construct the fake PTEs representing swap pages. */
 224 #define __swp_type(x)           ((x).val & 0x7F)
 225 #define __swp_offset(x)         (((x).val) >> 7)
 226 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
 227 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 228 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 229
 230 #endif  /* !__ASSEMBLY__ */
 231 #endif  /* !_SUN3_PGTABLE_H */