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| 684 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 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 | |||
| 1702 | cejka | 29 | /** @addtogroup genarchmm |
| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 684 | jermar | 35 | /* |
| 36 | * This is the generic 4-level page table interface. |
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| 37 | * Architectures that use hierarchical page tables |
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| 38 | * are supposed to implement *_ARCH macros. |
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| 39 | */ |
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| 40 | |||
| 1108 | jermar | 41 | #ifdef CONFIG_PAGE_PT |
| 42 | |||
| 684 | jermar | 43 | #ifndef __PAGE_PT_H__ |
| 44 | #define __PAGE_PT_H__ |
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| 45 | |||
| 46 | #include <arch/types.h> |
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| 47 | #include <typedefs.h> |
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| 48 | #include <mm/page.h> |
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| 49 | |||
| 50 | /* |
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| 832 | jermar | 51 | * Number of entries in each level. |
| 52 | */ |
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| 53 | #define PTL0_ENTRIES PTL0_ENTRIES_ARCH |
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| 54 | #define PTL1_ENTRIES PTL1_ENTRIES_ARCH |
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| 55 | #define PTL2_ENTRIES PTL2_ENTRIES_ARCH |
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| 56 | #define PTL3_ENTRIES PTL3_ENTRIES_ARCH |
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| 57 | |||
| 58 | /* |
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| 684 | jermar | 59 | * These macros process vaddr and extract those portions |
| 60 | * of it that function as indices to respective page tables. |
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| 61 | */ |
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| 62 | #define PTL0_INDEX(vaddr) PTL0_INDEX_ARCH(vaddr) |
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| 63 | #define PTL1_INDEX(vaddr) PTL1_INDEX_ARCH(vaddr) |
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| 64 | #define PTL2_INDEX(vaddr) PTL2_INDEX_ARCH(vaddr) |
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| 65 | #define PTL3_INDEX(vaddr) PTL3_INDEX_ARCH(vaddr) |
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| 66 | |||
| 67 | #define SET_PTL0_ADDRESS(ptl0) SET_PTL0_ADDRESS_ARCH(ptl0) |
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| 68 | |||
| 69 | /* |
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| 70 | * These macros traverse the 4-level tree of page tables, |
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| 71 | * each descending by one level. |
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| 72 | */ |
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| 73 | #define GET_PTL1_ADDRESS(ptl0, i) GET_PTL1_ADDRESS_ARCH(ptl0, i) |
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| 74 | #define GET_PTL2_ADDRESS(ptl1, i) GET_PTL2_ADDRESS_ARCH(ptl1, i) |
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| 75 | #define GET_PTL3_ADDRESS(ptl2, i) GET_PTL3_ADDRESS_ARCH(ptl2, i) |
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| 76 | #define GET_FRAME_ADDRESS(ptl3, i) GET_FRAME_ADDRESS_ARCH(ptl3, i) |
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| 77 | |||
| 78 | /* |
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| 79 | * These macros are provided to change shape of the 4-level |
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| 80 | * tree of page tables on respective level. |
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| 81 | */ |
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| 82 | #define SET_PTL1_ADDRESS(ptl0, i, a) SET_PTL1_ADDRESS_ARCH(ptl0, i, a) |
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| 83 | #define SET_PTL2_ADDRESS(ptl1, i, a) SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
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| 84 | #define SET_PTL3_ADDRESS(ptl2, i, a) SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
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| 85 | #define SET_FRAME_ADDRESS(ptl3, i, a) SET_FRAME_ADDRESS_ARCH(ptl3, i, a) |
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| 86 | |||
| 87 | /* |
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| 88 | * These macros are provided to query various flags within the page tables. |
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| 89 | */ |
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| 90 | #define GET_PTL1_FLAGS(ptl0, i) GET_PTL1_FLAGS_ARCH(ptl0, i) |
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| 91 | #define GET_PTL2_FLAGS(ptl1, i) GET_PTL2_FLAGS_ARCH(ptl1, i) |
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| 92 | #define GET_PTL3_FLAGS(ptl2, i) GET_PTL3_FLAGS_ARCH(ptl2, i) |
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| 93 | #define GET_FRAME_FLAGS(ptl3, i) GET_FRAME_FLAGS_ARCH(ptl3, i) |
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| 94 | |||
| 95 | /* |
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| 96 | * These macros are provided to set/clear various flags within the page tables. |
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| 97 | */ |
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| 98 | #define SET_PTL1_FLAGS(ptl0, i, x) SET_PTL1_FLAGS_ARCH(ptl0, i, x) |
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| 99 | #define SET_PTL2_FLAGS(ptl1, i, x) SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
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| 100 | #define SET_PTL3_FLAGS(ptl2, i, x) SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
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| 101 | #define SET_FRAME_FLAGS(ptl3, i, x) SET_FRAME_FLAGS_ARCH(ptl3, i, x) |
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| 102 | |||
| 977 | jermar | 103 | #define PTE_VALID(p) PTE_VALID_ARCH((p)) |
| 104 | #define PTE_PRESENT(p) PTE_PRESENT_ARCH((p)) |
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| 105 | #define PTE_GET_FRAME(p) PTE_GET_FRAME_ARCH((p)) |
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| 1423 | jermar | 106 | #define PTE_READABLE(p) 1 |
| 107 | #define PTE_WRITABLE(p) PTE_WRITABLE_ARCH((p)) |
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| 108 | #define PTE_EXECUTABLE(p) PTE_EXECUTABLE_ARCH((p)) |
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| 832 | jermar | 109 | |
| 793 | jermar | 110 | extern page_mapping_operations_t pt_mapping_operations; |
| 684 | jermar | 111 | |
| 756 | jermar | 112 | extern void page_mapping_insert_pt(as_t *as, __address page, __address frame, int flags); |
| 113 | extern pte_t *page_mapping_find_pt(as_t *as, __address page); |
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| 684 | jermar | 114 | |
| 115 | #endif |
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| 1108 | jermar | 116 | |
| 117 | #endif |
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| 1702 | cejka | 118 | |
| 119 | /** @} |
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| 120 | */ |
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| 121 |