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

   1 #ifndef _ASM_M32R_PGTABLE_2LEVEL_H
   2 #define _ASM_M32R_PGTABLE_2LEVEL_H
   3
   4 /* $Id$ */
   5
   6 #include <linux/config.h>
   7
   8 /*
   9  * traditional M32R two-level paging structure:
  10  */
  11
  12 #define PGDIR_SHIFT     22
  13 #define PTRS_PER_PGD    1024
  14
  15 /*
  16  * the M32R is two-level, so we don't really have any
  17  * PMD directory physically.
  18  */
  19 #define PMD_SHIFT       22
  20 #define PTRS_PER_PMD    1
  21
  22 #define PTRS_PER_PTE    1024
  23
  24 #define pte_ERROR(e) \
  25         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  26 #define pmd_ERROR(e) \
  27         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
  28 #define pgd_ERROR(e) \
  29         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  30
  31 /*
  32  * The "pgd_xxx()" functions here are trivial for a folded two-level
  33  * setup: the pgd is never bad, and a pmd always exists (as it's folded
  34  * into the pgd entry)
  35  */
  36 static __inline__ int pgd_none(pgd_t pgd)       { return 0; }
  37 static __inline__ int pgd_bad(pgd_t pgd)        { return 0; }
  38 static __inline__ int pgd_present(pgd_t pgd)    { return 1; }
  39 #define pgd_clear(xp)                           do { } while (0)
  40
  41 /*
  42  * Certain architectures need to do special things when PTEs
  43  * within a page table are directly modified.  Thus, the following
  44  * hook is made available.
  45  */
  46 #define set_pte(pteptr, pteval) (*(pteptr) = 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(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 /* M32R_FIXME : PTE_FILE_MAX_BITS, pte_to_pgoff, pgoff_to_pte */
  72 #define PTE_FILE_MAX_BITS       31
  73 #define pte_to_pgoff(pte)       (pte_val(pte) >> 1)
  74 #define pgoff_to_pte(off)       ((pte_t) { ((off) << 1) | _PAGE_FILE })
  75
  76 #endif /* _ASM_M32R_PGTABLE_2LEVEL_H */
  77