include/asm-m32r/pgtable-2level.h

   1 #ifndef _ASM_M32R_PGTABLE_2LEVEL_H
   2 #define _ASM_M32R_PGTABLE_2LEVEL_H
   3
   4 #ifdef __KERNEL__
   5
   6
   7 /*
   8  * traditional M32R two-level paging structure:
   9  */
  10
  11 #define PGDIR_SHIFT     22
  12 #define PTRS_PER_PGD    1024
  13
  14 /*
  15  * the M32R is two-level, so we don't really have any
  16  * PMD directory physically.
  17  */
  18 #define PMD_SHIFT       22
  19 #define PTRS_PER_PMD    1
  20
  21 #define PTRS_PER_PTE    1024
  22
  23 #define pte_ERROR(e) \
  24         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  25 #define pmd_ERROR(e) \
  26         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
  27 #define pgd_ERROR(e) \
  28         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  29
  30 /*
  31  * The "pgd_xxx()" functions here are trivial for a folded two-level
  32  * setup: the pgd is never bad, and a pmd always exists (as it's folded
  33  * into the pgd entry)
  34  */
  35 static inline int pgd_none(pgd_t pgd)   { return 0; }
  36 static inline int pgd_bad(pgd_t pgd)    { return 0; }
  37 static inline int pgd_present(pgd_t pgd)        { return 1; }
  38 #define pgd_clear(xp)                           do { } while (0)
  39
  40 /*
  41  * Certain architectures need to do special things when PTEs
  42  * within a page table are directly modified.  Thus, the following
  43  * hook is made available.
  44  */
  45 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  46 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  47 #define set_pte_atomic(pteptr, pteval)  set_pte(pteptr, pteval)
  48 /*
  49  * (pmds are folded into pgds so this doesnt get actually called,
  50  * but the define is needed for a generic inline function.)
  51  */
  52 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
  53 #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
  54
  55 #define pgd_page(pgd) \
  56 ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
  57
  58 static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address)
  59 {
  60         return (pmd_t *) dir;
  61 }
  62
  63 #define ptep_get_and_clear(mm,addr,xp)  __pte(xchg(&(xp)->pte, 0))
  64 #define pte_same(a, b)          (pte_val(a) == pte_val(b))
  65 #define pte_page(x)             pfn_to_page(pte_pfn(x))
  66 #define pte_none(x)             (!pte_val(x))
  67 #define pte_pfn(x)              (pte_val(x) >> PAGE_SHIFT)
  68 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  69 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  70
  71 #define PTE_FILE_MAX_BITS       29
  72 #define pte_to_pgoff(pte)       (((pte_val(pte) >> 2) & 0xef) | (((pte_val(pte) >> 10)) << 7))
  73 #define pgoff_to_pte(off)       ((pte_t) { (((off) & 0xef) << 2) | (((off) >> 7) << 10) | _PAGE_FILE })
  74
  75 #endif /* __KERNEL__ */
  76
  77 #endif /* _ASM_M32R_PGTABLE_2LEVEL_H */