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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 page hash table interface. |
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699 | jermar | 31 | * Architectures that use single page hash table for |
32 | * storing page translations must implement it. |
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684 | jermar | 33 | */ |
34 | |||
35 | #ifndef __PAGE_HT_H__ |
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36 | #define __PAGE_HT_H__ |
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37 | |||
38 | #include <mm/page.h> |
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746 | jermar | 39 | #include <typedefs.h> |
684 | jermar | 40 | |
756 | jermar | 41 | /** Page hash table size. */ |
42 | #define HT_WIDTH HT_WIDTH_ARCH |
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43 | #define HT_SIZE (1<<HT_WIDTH) |
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44 | #define HT_ENTRIES (HT_SIZE/sizeof(pte_t)) |
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746 | jermar | 45 | |
699 | jermar | 46 | /** Hash function. |
47 | * |
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48 | * @param page Virtual address. Only vpn bits will be used. |
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49 | * @param asid Address space identifier. |
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50 | * |
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51 | * @return Pointer to hash table typed pte_t *. |
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52 | */ |
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53 | #define HT_HASH(page, asid) HT_HASH_ARCH(page, asid) |
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54 | |||
55 | /** Compare PTE with page and asid. |
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56 | * |
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57 | * @param page Virtual address. Only vpn bits will be used. |
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58 | * @param asid Address space identifier. |
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59 | * @param t PTE. |
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60 | * |
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61 | * @return 1 on match, 0 otherwise. |
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62 | */ |
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63 | #define HT_COMPARE(page, asid, t) HT_COMPARE_ARCH(page, asid, t) |
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64 | |||
746 | jermar | 65 | /** Identify empty page hash table slots. |
699 | jermar | 66 | * |
67 | * @param t Pointer ro hash table typed pte_t *. |
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68 | * |
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69 | * @return 1 if the slot is empty, 0 otherwise. |
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70 | */ |
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71 | #define HT_SLOT_EMPTY(t) HT_SLOT_EMPTY_ARCH(t) |
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72 | |||
746 | jermar | 73 | /** Invalidate/empty page hash table slot. |
74 | * |
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75 | * @param t Address of the slot to be invalidated. |
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76 | */ |
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77 | #define HT_INVALIDATE_SLOT(t) HT_INVALIDATE_SLOT_ARCH(t) |
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78 | |||
699 | jermar | 79 | /** Return next record in collision chain. |
80 | * |
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81 | * @param t PTE. |
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82 | * |
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83 | * @return Successor of PTE or NULL. |
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84 | */ |
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85 | #define HT_GET_NEXT(t) HT_GET_NEXT_ARCH(t) |
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86 | |||
87 | /** Set successor in collision chain. |
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88 | * |
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89 | * @param t PTE. |
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90 | * @param s Successor or NULL. |
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91 | */ |
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92 | #define HT_SET_NEXT(t, s) HT_SET_NEXT_ARCH(t, s) |
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93 | |||
94 | /** Set page hash table record. |
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95 | * |
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96 | * @param t PTE. |
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97 | * @param page Virtual address. Only vpn bits will be used. |
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98 | * @param asid Address space identifier. |
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99 | * @param frame Physical address. Only pfn bits will be used. |
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100 | * @param flags Flags. See mm/page.h. |
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101 | */ |
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102 | #define HT_SET_RECORD(t, page, asid, frame, flags) HT_SET_RECORD_ARCH(t, page, asid, frame, flags) |
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103 | |||
684 | jermar | 104 | extern page_operations_t page_ht_operations; |
746 | jermar | 105 | extern spinlock_t page_ht_lock; |
684 | jermar | 106 | |
746 | jermar | 107 | extern pte_t *page_ht; |
108 | |||
109 | extern void ht_invalidate_all(void); |
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110 | |||
684 | jermar | 111 | #endif |