| #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 */ |