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- | 1 | /* |
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- | 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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- | 3 | * All rights reserved. |
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- | 4 | * |
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- | 5 | * Redistribution and use in source and binary forms, with or without |
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- | 6 | * modification, are permitted provided that the following conditions |
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- | 7 | * are met: |
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- | 8 | * |
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- | 9 | * - Redistributions of source code must retain the above copyright |
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- | 10 | * notice, this list of conditions and the following disclaimer. |
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- | 11 | * - Redistributions in binary form must reproduce the above copyright |
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- | 12 | * notice, this list of conditions and the following disclaimer in the |
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- | 13 | * documentation and/or other materials provided with the distribution. |
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- | 14 | * - The name of the author may not be used to endorse or promote products |
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- | 15 | * derived from this software without specific prior written permission. |
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- | 16 | * |
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- | 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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- | 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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- | 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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- | 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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- | 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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- | 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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- | 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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- | 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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- | 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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- | 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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- | 27 | */ |
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- | 28 | ||
- | 29 | #ifndef __PAGE_H__ |
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- | 30 | #define __PAGE_H__ |
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- | 31 | ||
- | 32 | #include <arch/types.h> |
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- | 33 | #include <typedefs.h> |
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- | 34 | ||
- | 35 | #define PAGE_CACHEABLE_SHIFT 0 |
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- | 36 | #define PAGE_NOT_CACHEABLE_SHIFT PAGE_CACHEABLE_SHIFT |
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- | 37 | #define PAGE_PRESENT_SHIFT 1 |
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- | 38 | #define PAGE_NOT_PRESENT_SHIFT PAGE_PRESENT_SHIFT |
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- | 39 | #define PAGE_USER_SHIFT 2 |
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- | 40 | #define PAGE_KERNEL_SHIFT PAGE_USER_SHIFT |
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- | 41 | #define PAGE_READ_SHIFT 3 |
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- | 42 | #define PAGE_WRITE_SHIFT 4 |
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- | 43 | #define PAGE_EXEC_SHIFT 5 |
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- | 44 | ||
- | 45 | #define PAGE_NOT_CACHEABLE (0<<PAGE_CACHEABLE_SHIFT) |
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- | 46 | #define PAGE_CACHEABLE (1<<PAGE_CACHEABLE_SHIFT) |
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- | 47 | ||
- | 48 | #define PAGE_PRESENT (0<<PAGE_PRESENT_SHIFT) |
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- | 49 | #define PAGE_NOT_PRESENT (1<<PAGE_PRESENT_SHIFT) |
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- | 50 | ||
- | 51 | #define PAGE_USER (1<<PAGE_USER_SHIFT) |
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- | 52 | #define PAGE_KERNEL (0<<PAGE_USER_SHIFT) |
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- | 53 | ||
- | 54 | #define PAGE_READ (1<<PAGE_READ_SHIFT) |
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- | 55 | #define PAGE_WRITE (1<<PAGE_WRITE_SHIFT) |
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- | 56 | #define PAGE_EXEC (1<<PAGE_EXEC_SHIFT) |
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- | 57 | ||
- | 58 | /* |
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- | 59 | * This is the generic 4-level page table interface. |
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- | 60 | * Architectures are supposed to implement *_ARCH macros. |
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- | 61 | */ |
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- | 62 | ||
- | 63 | /* |
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- | 64 | * These macros process vaddr and extract those portions |
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- | 65 | * of it that function as indices to respective page tables. |
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- | 66 | */ |
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- | 67 | #define PTL0_INDEX(vaddr) PTL0_INDEX_ARCH(vaddr) |
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- | 68 | #define PTL1_INDEX(vaddr) PTL1_INDEX_ARCH(vaddr) |
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- | 69 | #define PTL2_INDEX(vaddr) PTL2_INDEX_ARCH(vaddr) |
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- | 70 | #define PTL3_INDEX(vaddr) PTL3_INDEX_ARCH(vaddr) |
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- | 71 | ||
- | 72 | #define GET_PTL0_ADDRESS() GET_PTL0_ADDRESS_ARCH() |
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- | 73 | #define SET_PTL0_ADDRESS(ptl0) SET_PTL0_ADDRESS_ARCH(ptl0) |
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- | 74 | ||
- | 75 | /* |
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- | 76 | * These macros traverse the 4-level tree of page tables, |
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- | 77 | * each descending by one level. |
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- | 78 | */ |
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- | 79 | #define GET_PTL1_ADDRESS(ptl0, i) GET_PTL1_ADDRESS_ARCH(ptl0, i) |
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- | 80 | #define GET_PTL2_ADDRESS(ptl1, i) GET_PTL2_ADDRESS_ARCH(ptl1, i) |
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- | 81 | #define GET_PTL3_ADDRESS(ptl2, i) GET_PTL3_ADDRESS_ARCH(ptl2, i) |
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- | 82 | #define GET_FRAME_ADDRESS(ptl3, i) GET_FRAME_ADDRESS_ARCH(ptl3, i) |
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- | 83 | ||
- | 84 | /* |
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- | 85 | * These macros are provided to change shape of the 4-level |
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- | 86 | * tree of page tables on respective level. |
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- | 87 | */ |
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- | 88 | #define SET_PTL1_ADDRESS(ptl0, i, a) SET_PTL1_ADDRESS_ARCH(ptl0, i, a) |
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- | 89 | #define SET_PTL2_ADDRESS(ptl1, i, a) SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
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- | 90 | #define SET_PTL3_ADDRESS(ptl2, i, a) SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
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- | 91 | #define SET_FRAME_ADDRESS(ptl3, i, a) SET_FRAME_ADDRESS_ARCH(ptl3, i, a) |
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- | 92 | ||
- | 93 | /* |
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- | 94 | * These macros are provided to query various flags within the page tables. |
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- | 95 | */ |
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- | 96 | #define GET_PTL1_FLAGS(ptl0, i) GET_PTL1_FLAGS_ARCH(ptl0, i) |
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- | 97 | #define GET_PTL2_FLAGS(ptl1, i) GET_PTL2_FLAGS_ARCH(ptl1, i) |
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- | 98 | #define GET_PTL3_FLAGS(ptl2, i) GET_PTL3_FLAGS_ARCH(ptl2, i) |
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- | 99 | #define GET_FRAME_FLAGS(ptl3, i) GET_FRAME_FLAGS_ARCH(ptl3, i) |
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- | 100 | ||
- | 101 | /* |
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- | 102 | * These macros are provided to set/clear various flags within the page tables. |
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- | 103 | */ |
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- | 104 | #define SET_PTL1_FLAGS(ptl0, i, x) SET_PTL1_FLAGS_ARCH(ptl0, i, x) |
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- | 105 | #define SET_PTL2_FLAGS(ptl1, i, x) SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
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- | 106 | #define SET_PTL3_FLAGS(ptl2, i, x) SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
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- | 107 | #define SET_FRAME_FLAGS(ptl3, i, x) SET_FRAME_FLAGS_ARCH(ptl3, i, x) |
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- | 108 | ||
- | 109 | extern void page_init(void); |
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- | 110 | extern void page_mapping_insert(__address page, __address frame, int flags, __address root); |
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- | 111 | extern pte_t *page_mapping_find(__address page, __address root); |
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- | 112 | extern void map_structure(__address s, size_t size); |
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- | 113 | ||
- | 114 | #endif |