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#ifndef _I386_PGTABLE_2LEVEL_H

#define _I386_PGTABLE_2LEVEL_H

/*

 * traditional i386 two-level paging structure:

 */

#define PGDIR_SHIFT     22

#define PTRS_PER_PGD    1024

/*

 * the i386 is two-level, so we don't really have any

 * PMD directory physically.

 */

#define PMD_SHIFT       22

#define PTRS_PER_PMD    1

#define PTRS_PER_PTE    1024

#define pte_ERROR(e) \

        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)

#define pmd_ERROR(e) \

        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))

#define pgd_ERROR(e) \

        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))

/*

 * The "pgd_xxx()" functions here are trivial for a folded two-level

 * setup: the pgd is never bad, and a pmd always exists (as it's folded

 * into the pgd entry)

 */

static inline int pgd_none(pgd_t pgd)           { return 0; }

static inline int pgd_bad(pgd_t pgd)            { return 0; }

static inline int pgd_present(pgd_t pgd)        { return 1; }

#define pgd_clear(xp)                           do { } while (0)

/*

 * Certain architectures need to do special things when PTEs

 * within a page table are directly modified.  Thus, the following

 * hook is made available.

 */

#define set_pte(pteptr, pteval) (*(pteptr) = pteval)

#define set_pte_atomic(pteptr, pteval) (*(pteptr) = pteval)

/*

 * (pmds are folded into pgds so this doesnt get actually called,

 * but the define is needed for a generic inline function.)

 */

#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)

#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)

#define pgd_page(pgd) \

((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))

static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)

{

        return (pmd_t *) dir;

}

#define ptep_get_and_clear(xp)  __pte(xchg(&(xp)->pte_low, 0))

#define pte_same(a, b)          ((a).pte_low == (b).pte_low)

#define pte_page(x)             (mem_map+((unsigned long)(((x).pte_low >> PAGE_SHIFT))))

#define pte_none(x)             (!(x).pte_low)

#define __mk_pte(page_nr,pgprot) __pte(((page_nr) << PAGE_SHIFT) | pgprot_val(pgprot))

#endif /* _I386_PGTABLE_2LEVEL_H */