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 PMD_SHIFT       22
  17#define PTRS_PER_PMD    1
  18
  19#define PTRS_PER_PTE    1024
  20
  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 */
  33static inline int pgd_none(pgd_t pgd)   { return 0; }
  34static inline int pgd_bad(pgd_t pgd)    { return 0; }
  35static inline int pgd_present(pgd_t pgd)        { return 1; }
  36#define pgd_clear(xp)                           do { } while (0)
  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 doesnt 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_vaddr(pgd) \
  54((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
  55
  56#ifndef CONFIG_DISCONTIGMEM
  57#define pgd_page(pgd)   (mem_map + ((pgd_val(pgd) >> PAGE_SHIFT) - PFN_BASE))
  58#endif /* !CONFIG_DISCONTIGMEM */
  59
  60static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address)
  61{
  62        return (pmd_t *) dir;
  63}
  64
  65#define ptep_get_and_clear(mm,addr,xp)  __pte(xchg(&(xp)->pte, 0))
  66#define pte_same(a, b)          (pte_val(a) == pte_val(b))
  67#define pte_page(x)             pfn_to_page(pte_pfn(x))
  68#define pte_none(x)             (!pte_val(x))
  69#define pte_pfn(x)              (pte_val(x) >> PAGE_SHIFT)
  70#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  71#define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  72
  73#define PTE_FILE_MAX_BITS       29
  74#define pte_to_pgoff(pte)       (((pte_val(pte) >> 2) & 0x7f) | (((pte_val(pte) >> 10)) << 7))
  75#define pgoff_to_pte(off)       ((pte_t) { (((off) & 0x7f) << 2) | (((off) >> 7) << 10) | _PAGE_FILE })
  76
  77#endif /* __KERNEL__ */
  78#endif /* _ASM_M32R_PGTABLE_2LEVEL_H */
  79