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| Rev | Author | Line No. | Line |
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| 5270 | serge | 1 | #ifndef _ASM_X86_PGTABLE_32_H |
| 2 | #define _ASM_X86_PGTABLE_32_H |
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| 3 | |||
| 4 | #include |
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| 5 | |||
| 6 | /* |
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| 7 | * The Linux memory management assumes a three-level page table setup. On |
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| 8 | * the i386, we use that, but "fold" the mid level into the top-level page |
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| 9 | * table, so that we physically have the same two-level page table as the |
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| 10 | * i386 mmu expects. |
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| 11 | * |
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| 12 | * This file contains the functions and defines necessary to modify and use |
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| 13 | * the i386 page table tree. |
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| 14 | */ |
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| 15 | #ifndef __ASSEMBLY__ |
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| 16 | #include |
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| 17 | #include |
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| 18 | |||
| 19 | #include |
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| 20 | #include |
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| 21 | #include |
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| 22 | |||
| 23 | struct mm_struct; |
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| 24 | struct vm_area_struct; |
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| 25 | |||
| 26 | extern pgd_t swapper_pg_dir[1024]; |
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| 27 | extern pgd_t initial_page_table[1024]; |
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| 28 | |||
| 29 | static inline void pgtable_cache_init(void) { } |
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| 30 | static inline void check_pgt_cache(void) { } |
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| 31 | void paging_init(void); |
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| 32 | |||
| 33 | /* |
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| 34 | * Define this if things work differently on an i386 and an i486: |
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| 35 | * it will (on an i486) warn about kernel memory accesses that are |
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| 36 | * done without a 'access_ok(VERIFY_WRITE,..)' |
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| 37 | */ |
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| 38 | #undef TEST_ACCESS_OK |
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| 39 | |||
| 40 | #ifdef CONFIG_X86_PAE |
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| 41 | # include |
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| 42 | #else |
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| 43 | # include |
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| 44 | #endif |
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| 45 | |||
| 46 | #if defined(CONFIG_HIGHPTE) |
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| 47 | #define pte_offset_map(dir, address) \ |
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| 48 | ((pte_t *)kmap_atomic(pmd_page(*(dir))) + \ |
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| 49 | pte_index((address))) |
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| 50 | #define pte_unmap(pte) kunmap_atomic((pte)) |
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| 51 | #else |
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| 52 | #define pte_offset_map(dir, address) \ |
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| 53 | ((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address))) |
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| 54 | #define pte_unmap(pte) do { } while (0) |
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| 55 | #endif |
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| 56 | |||
| 57 | /* Clear a kernel PTE and flush it from the TLB */ |
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| 58 | #define kpte_clear_flush(ptep, vaddr) \ |
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| 59 | do { \ |
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| 60 | pte_clear(&init_mm, (vaddr), (ptep)); \ |
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| 61 | __flush_tlb_one((vaddr)); \ |
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| 62 | } while (0) |
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| 63 | |||
| 64 | #endif /* !__ASSEMBLY__ */ |
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| 65 | |||
| 66 | /* |
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| 67 | * kern_addr_valid() is (1) for FLATMEM and (0) for |
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| 68 | * SPARSEMEM and DISCONTIGMEM |
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| 69 | */ |
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| 70 | #ifdef CONFIG_FLATMEM |
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| 71 | #define kern_addr_valid(addr) (1) |
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| 72 | #else |
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| 73 | #define kern_addr_valid(kaddr) (0) |
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| 74 | #endif |
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| 75 | |||
| 76 | #endif /* _ASM_X86_PGTABLE_32_H */ |