LXR linux/arch/m32r/include/asm/pgtable-2level.h

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