root/arch/m68k/include/asm/sun3_pgtable.h

INCLUDED FROM

DEFINITIONS

1. pte_modify
2. pgd_set
3. pte_none
4. pte_present
5. pte_clear
6. pmd_none2
7. pmd_bad2
8. pmd_present2
9. pmd_clear
10. pgd_none
11. pgd_bad
12. pgd_present
13. pgd_clear
14. pte_write
15. pte_dirty
16. pte_young
17. pte_special
18. pte_wrprotect
19. pte_mkclean
20. pte_mkold
21. pte_mkwrite
22. pte_mkdirty
23. pte_mkyoung
24. pte_mknocache
25. pte_mkcache
26. pte_mkspecial
27. pmd_offset

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _SUN3_PGTABLE_H
   3 #define _SUN3_PGTABLE_H
   4 
   5 #include <asm/sun3mmu.h>
   6 
   7 #ifndef __ASSEMBLY__
   8 #include <asm/virtconvert.h>
   9 #include <linux/linkage.h>
  10 
  11 /*
  12  * This file contains all the things which change drastically for the sun3
  13  * pagetable stuff, to avoid making too much of a mess of the generic m68k
  14  * `pgtable.h'; this should only be included from the generic file. --m
  15  */
  16 
  17 /* For virtual address to physical address conversion */
  18 #define VTOP(addr)      __pa(addr)
  19 #define PTOV(addr)      __va(addr)
  20 
  21 
  22 #endif  /* !__ASSEMBLY__ */
  23 
  24 /* These need to be defined for compatibility although the sun3 doesn't use them */
  25 #define _PAGE_NOCACHE030 0x040
  26 #define _CACHEMASK040   (~0x060)
  27 #define _PAGE_NOCACHE_S 0x040
  28 
  29 /* Page protection values within PTE. */
  30 #define SUN3_PAGE_VALID     (0x80000000)
  31 #define SUN3_PAGE_WRITEABLE (0x40000000)
  32 #define SUN3_PAGE_SYSTEM    (0x20000000)
  33 #define SUN3_PAGE_NOCACHE   (0x10000000)
  34 #define SUN3_PAGE_ACCESSED  (0x02000000)
  35 #define SUN3_PAGE_MODIFIED  (0x01000000)
  36 
  37 
  38 /* Externally used page protection values. */
  39 #define _PAGE_PRESENT   (SUN3_PAGE_VALID)
  40 #define _PAGE_ACCESSED  (SUN3_PAGE_ACCESSED)
  41 
  42 /* Compound page protection values. */
  43 //todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix...
  44 // is it just PAGE_KERNEL and PAGE_SHARED?
  45 #define PAGE_NONE       __pgprot(SUN3_PAGE_VALID \
  46                                  | SUN3_PAGE_ACCESSED \
  47                                  | SUN3_PAGE_NOCACHE)
  48 #define PAGE_SHARED     __pgprot(SUN3_PAGE_VALID \
  49                                  | SUN3_PAGE_WRITEABLE \
  50                                  | SUN3_PAGE_ACCESSED \
  51                                  | SUN3_PAGE_NOCACHE)
  52 #define PAGE_COPY       __pgprot(SUN3_PAGE_VALID \
  53                                  | SUN3_PAGE_ACCESSED \
  54                                  | SUN3_PAGE_NOCACHE)
  55 #define PAGE_READONLY   __pgprot(SUN3_PAGE_VALID \
  56                                  | SUN3_PAGE_ACCESSED \
  57                                  | SUN3_PAGE_NOCACHE)
  58 #define PAGE_KERNEL     __pgprot(SUN3_PAGE_VALID \
  59                                  | SUN3_PAGE_WRITEABLE \
  60                                  | SUN3_PAGE_SYSTEM \
  61                                  | SUN3_PAGE_NOCACHE \
  62                                  | SUN3_PAGE_ACCESSED \
  63                                  | SUN3_PAGE_MODIFIED)
  64 #define PAGE_INIT       __pgprot(SUN3_PAGE_VALID \
  65                                  | SUN3_PAGE_WRITEABLE \
  66                                  | SUN3_PAGE_SYSTEM \
  67                                  | SUN3_PAGE_NOCACHE)
  68 
  69 /*
  70  * Page protections for initialising protection_map. The sun3 has only two
  71  * protection settings, valid (implying read and execute) and writeable. These
  72  * are as close as we can get...
  73  */
  74 #define __P000  PAGE_NONE
  75 #define __P001  PAGE_READONLY
  76 #define __P010  PAGE_COPY
  77 #define __P011  PAGE_COPY
  78 #define __P100  PAGE_READONLY
  79 #define __P101  PAGE_READONLY
  80 #define __P110  PAGE_COPY
  81 #define __P111  PAGE_COPY
  82 
  83 #define __S000  PAGE_NONE
  84 #define __S001  PAGE_READONLY
  85 #define __S010  PAGE_SHARED
  86 #define __S011  PAGE_SHARED
  87 #define __S100  PAGE_READONLY
  88 #define __S101  PAGE_READONLY
  89 #define __S110  PAGE_SHARED
  90 #define __S111  PAGE_SHARED
  91 
  92 /* Use these fake page-protections on PMDs. */
  93 #define SUN3_PMD_VALID  (0x00000001)
  94 #define SUN3_PMD_MASK   (0x0000003F)
  95 #define SUN3_PMD_MAGIC  (0x0000002B)
  96 
  97 #ifndef __ASSEMBLY__
  98 
  99 /*
 100  * Conversion functions: convert a page and protection to a page entry,
 101  * and a page entry and page directory to the page they refer to.
 102  */
 103 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
 104 
 105 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 106 {
 107         pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
 108         return pte;
 109 }
 110 
 111 #define pmd_set(pmdp,ptep) do {} while (0)
 112 
 113 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
 114 {
 115         pgd_val(*pgdp) = virt_to_phys(pmdp);
 116 }
 117 
 118 #define __pte_page(pte) \
 119 ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
 120 #define __pmd_page(pmd) \
 121 ((unsigned long) __va (pmd_val (pmd) & PAGE_MASK))
 122 
 123 static inline int pte_none (pte_t pte) { return !pte_val (pte); }
 124 static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
 125 static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 126 {
 127         pte_val (*ptep) = 0;
 128 }
 129 
 130 #define pte_pfn(pte)            (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
 131 #define pfn_pte(pfn, pgprot) \
 132 ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
 133 
 134 #define pte_page(pte)           virt_to_page(__pte_page(pte))
 135 #define pmd_page(pmd)           virt_to_page(__pmd_page(pmd))
 136 
 137 
 138 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
 139 #define pmd_none(pmd) pmd_none2(&(pmd))
 140 //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
 141 static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
 142 #define pmd_bad(pmd) pmd_bad2(&(pmd))
 143 static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
 144 /* #define pmd_present(pmd) pmd_present2(&(pmd)) */
 145 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
 146 static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
 147 
 148 static inline int pgd_none (pgd_t pgd) { return 0; }
 149 static inline int pgd_bad (pgd_t pgd) { return 0; }
 150 static inline int pgd_present (pgd_t pgd) { return 1; }
 151 static inline void pgd_clear (pgd_t *pgdp) {}
 152 
 153 
 154 #define pte_ERROR(e) \
 155         pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 156 #define pmd_ERROR(e) \
 157         pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 158 #define pgd_ERROR(e) \
 159         pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 160 
 161 
 162 /*
 163  * The following only work if pte_present() is true.
 164  * Undefined behaviour if not...
 165  * [we have the full set here even if they don't change from m68k]
 166  */
 167 static inline int pte_write(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
 168 static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
 169 static inline int pte_young(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
 170 static inline int pte_special(pte_t pte)        { return 0; }
 171 
 172 static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
 173 static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
 174 static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
 175 static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
 176 static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
 177 static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
 178 static inline pte_t pte_mknocache(pte_t pte)    { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
 179 // use this version when caches work...
 180 //static inline pte_t pte_mkcache(pte_t pte)    { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
 181 // until then, use:
 182 static inline pte_t pte_mkcache(pte_t pte)      { return pte; }
 183 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 184 
 185 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 186 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
 187 
 188 /* Find an entry in a pagetable directory. */
 189 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
 190 
 191 #define pgd_offset(mm, address) \
 192 ((mm)->pgd + pgd_index(address))
 193 
 194 /* Find an entry in a kernel pagetable directory. */
 195 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 196 
 197 /* Find an entry in the second-level pagetable. */
 198 static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
 199 {
 200         return (pmd_t *) pgd;
 201 }
 202 
 203 /* Find an entry in the third-level pagetable. */
 204 #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
 205 #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
 206 #define pte_offset_map(pmd, address) ((pte_t *)page_address(pmd_page(*pmd)) + pte_index(address))
 207 #define pte_unmap(pte) do { } while (0)
 208 
 209 /* Macros to (de)construct the fake PTEs representing swap pages. */
 210 #define __swp_type(x)           ((x).val & 0x7F)
 211 #define __swp_offset(x)         (((x).val) >> 7)
 212 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
 213 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 214 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
 215 
 216 #endif  /* !__ASSEMBLY__ */
 217 #endif  /* !_SUN3_PGTABLE_H */