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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _I386_PGTABLE_2LEVEL_H |
| 2 | #define _I386_PGTABLE_2LEVEL_H |
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| 3 | |||
| 4 | /* |
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| 5 | * traditional i386 two-level paging structure: |
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| 6 | */ |
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| 7 | |||
| 8 | #define PGDIR_SHIFT 22 |
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| 9 | #define PTRS_PER_PGD 1024 |
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| 10 | |||
| 11 | /* |
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| 12 | * the i386 is two-level, so we don't really have any |
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| 13 | * PMD directory physically. |
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| 14 | */ |
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| 15 | #define PMD_SHIFT 22 |
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| 16 | #define PTRS_PER_PMD 1 |
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| 17 | |||
| 18 | #define PTRS_PER_PTE 1024 |
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| 19 | |||
| 20 | #define pte_ERROR(e) \ |
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| 21 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low) |
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| 22 | #define pmd_ERROR(e) \ |
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| 23 | printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) |
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| 24 | #define pgd_ERROR(e) \ |
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| 25 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
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| 26 | |||
| 27 | /* |
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| 28 | * The "pgd_xxx()" functions here are trivial for a folded two-level |
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| 29 | * setup: the pgd is never bad, and a pmd always exists (as it's folded |
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| 30 | * into the pgd entry) |
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| 31 | */ |
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| 32 | static inline int pgd_none(pgd_t pgd) { return 0; } |
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| 33 | static inline int pgd_bad(pgd_t pgd) { return 0; } |
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| 34 | static inline int pgd_present(pgd_t pgd) { return 1; } |
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| 35 | #define pgd_clear(xp) do { } while (0) |
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| 36 | |||
| 37 | /* |
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| 38 | * Certain architectures need to do special things when PTEs |
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| 39 | * within a page table are directly modified. Thus, the following |
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| 40 | * hook is made available. |
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| 41 | */ |
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| 42 | #define set_pte(pteptr, pteval) (*(pteptr) = pteval) |
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| 43 | #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval) |
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| 44 | /* |
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| 45 | * (pmds are folded into pgds so this doesn't get actually called, |
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| 46 | * but the define is needed for a generic inline function.) |
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| 47 | */ |
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| 48 | #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) |
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| 49 | #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval) |
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| 50 | |||
| 51 | #define pgd_page(pgd) \ |
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| 52 | ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK)) |
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| 53 | |||
| 54 | static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) |
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| 55 | { |
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| 56 | return (pmd_t *) dir; |
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| 57 | } |
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| 58 | #define ptep_get_and_clear(xp) __pte(xchg(&(xp)->pte_low, 0)) |
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| 59 | #define pte_same(a, b) ((a).pte_low == (b).pte_low) |
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| 60 | #define pte_page(x) pfn_to_page(pte_pfn(x)) |
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| 61 | #define pte_none(x) (!(x).pte_low) |
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| 62 | #define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT))) |
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| 63 | #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) |
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| 64 | #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) |
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| 65 | |||
| 66 | /* |
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| 67 | * Bits 0, 6 and 7 are taken, split up the 29 bits of offset |
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| 68 | * into this range: |
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| 69 | */ |
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| 70 | #define PTE_FILE_MAX_BITS 29 |
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| 71 | |||
| 72 | #define pte_to_pgoff(pte) \ |
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| 73 | ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 )) |
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| 74 | |||
| 75 | #define pgoff_to_pte(off) \ |
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| 76 | ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE }) |
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| 77 | |||
| 78 | #endif /* _I386_PGTABLE_2LEVEL_H */ |