LXR linux/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#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 */
  36static inline int pgd_none(pgd_t pgd)   { return 0; }
  37static inline int pgd_bad(pgd_t pgd)    { return 0; }
  38static 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
  58static 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#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 */
  78