include/asm-sh/pgtable-2level.h

   1 #ifndef __ASM_SH_PGTABLE_2LEVEL_H
   2 #define __ASM_SH_PGTABLE_2LEVEL_H
   3
   4 /*
   5  * traditional two-level paging structure:
   6  */
   7
   8 #define PGDIR_SHIFT     22
   9 #define PTRS_PER_PGD    1024
  10
  11 /*
  12  * this is two-level, so we don't really have any
  13  * PMD directory physically.
  14  */
  15 #define PMD_SHIFT       22
  16 #define PTRS_PER_PMD    1
  17
  18 #define PTRS_PER_PTE    1024
  19
  20 #ifndef __ASSEMBLY__
  21 #define pte_ERROR(e) \
  22         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  23 #define pmd_ERROR(e) \
  24         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
  25 #define pgd_ERROR(e) \
  26         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  27
  28 /*
  29  * The "pgd_xxx()" functions here are trivial for a folded two-level
  30  * setup: the pgd is never bad, and a pmd always exists (as it's folded
  31  * into the pgd entry)
  32  */
  33 static inline int pgd_none(pgd_t pgd)           { return 0; }
  34 static inline int pgd_bad(pgd_t pgd)            { return 0; }
  35 static inline int pgd_present(pgd_t pgd)        { return 1; }
  36 static inline void pgd_clear (pgd_t * pgdp)     { }
  37
  38 /*
  39  * Certain architectures need to do special things when PTEs
  40  * within a page table are directly modified.  Thus, the following
  41  * hook is made available.
  42  */
  43 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  44 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  45
  46 /*
  47  * (pmds are folded into pgds so this doesn't get actually called,
  48  * but the define is needed for a generic inline function.)
  49  */
  50 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
  51 #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
  52
  53 #define pgd_page(pgd) \
  54 ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
  55
  56 static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
  57 {
  58         return (pmd_t *) dir;
  59 }
  60
  61 #define pte_pfn(x)              ((unsigned long)(((x).pte >> PAGE_SHIFT)))
  62 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  63 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  64
  65 #endif /* !__ASSEMBLY__ */
  66
  67 #endif /* __ASM_SH_PGTABLE_2LEVEL_H */