LXR linux/arch/m68k/include/asm/sun3

   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
 105static 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
 113static 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
 123static inline int pte_none (pte_t pte) { return !pte_val (pte); }
 124static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
 125static 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
 138static 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; }
 141static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
 142#define pmd_bad(pmd) pmd_bad2(&(pmd))
 143static 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)))
 146static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
 147
 148static inline int pgd_none (pgd_t pgd) { return 0; }
 149static inline int pgd_bad (pgd_t pgd) { return 0; }
 150static inline int pgd_present (pgd_t pgd) { return 1; }
 151static 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 */
 167static inline int pte_write(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
 168static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
 169static inline int pte_young(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
 170static inline int pte_special(pte_t pte)        { return 0; }
 171
 172static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
 173static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
 174static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
 175static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
 176static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
 177static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
 178static 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:
 182static inline pte_t pte_mkcache(pte_t pte)      { return pte; }
 183static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 184
 185extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 186extern 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. */
 198static 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 */
 218