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