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

   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
 106static 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
 114static 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
 124static inline int pte_none (pte_t pte) { return !pte_val (pte); }
 125static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
 126static 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
 139static 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; }
 142static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
 143#define pmd_bad(pmd) pmd_bad2(&(pmd))
 144static 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)))
 147static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
 148
 149static inline int pgd_none (pgd_t pgd) { return 0; }
 150static inline int pgd_bad (pgd_t pgd) { return 0; }
 151static inline int pgd_present (pgd_t pgd) { return 1; }
 152static 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 */
 168static inline int pte_write(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
 169static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
 170static inline int pte_young(pte_t pte)          { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
 171static inline int pte_file(pte_t pte)           { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
 172static inline int pte_special(pte_t pte)        { return 0; }
 173
 174static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
 175static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
 176static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
 177static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
 178static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
 179static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
 180static 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:
 184static inline pte_t pte_mkcache(pte_t pte)      { return pte; }
 185static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 186
 187extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 188extern 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. */
 200static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
 201{
 202        return (pmd_t *) pgd;
 203}
 204
 205static inline unsigned long pte_to_pgoff(pte_t pte)
 206{
 207        return pte.pte & SUN3_PAGE_PGNUM_MASK;
 208}
 209
 210static 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 */
 232