#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)/* * (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 */