Rev 1269 | Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
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| 1215 | decky | 1 | /* |
| 2 | * Copyright (C) 2006 Martin Decky |
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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 | #include <arch/mm/tlb.h> |
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| 30 | #include <arch/types.h> |
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| 31 | #include <mm/tlb.h> |
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| 32 | #include <mm/page.h> |
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| 33 | #include <mm/as.h> |
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| 34 | #include <arch.h> |
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| 35 | #include <print.h> |
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| 36 | #include <symtab.h> |
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| 37 | |||
| 38 | |||
| 39 | /** Initialize Page Hash Table. |
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| 40 | * |
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| 41 | * Setup the Page Hash Table with no entries. |
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| 42 | * |
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| 43 | */ |
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| 44 | void tlb_arch_init(void) |
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| 45 | { |
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| 46 | } |
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| 47 | |||
| 48 | |||
| 49 | /** Try to find PTE for faulting address |
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| 50 | * |
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| 51 | * Try to find PTE for faulting address. |
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| 52 | * The AS->lock must be held on entry to this function. |
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| 53 | * |
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| 54 | * @param badvaddr Faulting virtual address. |
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| 55 | * @return PTE on success, NULL otherwise. |
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| 56 | * |
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| 57 | */ |
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| 58 | static pte_t *find_mapping_and_check(__address badvaddr) |
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| 59 | { |
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| 60 | /* |
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| 61 | * Check if the mapping exists in page tables. |
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| 62 | */ |
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| 63 | pte_t *pte = page_mapping_find(AS, badvaddr); |
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| 64 | if ((pte) && (pte->p)) { |
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| 65 | /* |
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| 66 | * Mapping found in page tables. |
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| 67 | * Immediately succeed. |
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| 68 | */ |
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| 69 | return pte; |
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| 70 | } else { |
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| 71 | /* |
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| 72 | * Mapping not found in page tables. |
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| 73 | * Resort to higher-level page fault handler. |
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| 74 | */ |
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| 75 | page_table_unlock(AS, true); |
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| 76 | if (as_page_fault(badvaddr)) { |
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| 77 | /* |
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| 78 | * The higher-level page fault handler succeeded, |
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| 79 | * The mapping ought to be in place. |
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| 80 | */ |
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| 81 | page_table_lock(AS, true); |
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| 82 | pte = page_mapping_find(AS, badvaddr); |
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| 83 | ASSERT((pte) && (pte->p)); |
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| 84 | return pte; |
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| 85 | } else { |
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| 86 | page_table_lock(AS, true); |
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| 87 | printf("Page fault.\n"); |
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| 88 | return NULL; |
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| 89 | } |
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| 90 | |||
| 91 | } |
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| 92 | } |
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| 93 | |||
| 94 | |||
| 95 | static void pht_refill_fail(__address badvaddr, istate_t *istate) |
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| 96 | { |
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| 97 | char *symbol = ""; |
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| 98 | char *sym2 = ""; |
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| 99 | |||
| 100 | char *s = get_symtab_entry(istate->pc); |
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| 101 | if (s) |
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| 102 | symbol = s; |
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| 103 | s = get_symtab_entry(istate->lr); |
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| 104 | if (s) |
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| 105 | sym2 = s; |
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| 106 | panic("%X: PHT Refill Exception at %X(%s<-%s)\n", badvaddr, istate->pc, symbol, sym2); |
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| 107 | } |
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| 108 | |||
| 109 | |||
| 110 | /** Process Data Storage Interrupt |
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| 111 | * |
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| 112 | * @param istate Interrupted register context. |
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| 113 | * |
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| 114 | */ |
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| 115 | void pht_refill(istate_t *istate) |
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| 116 | { |
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| 117 | asid_t asid; |
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| 118 | __address badvaddr; |
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| 119 | pte_t *pte; |
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| 120 | |||
| 121 | __asm__ volatile ( |
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| 122 | "mfdar %0\n" |
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| 123 | : "=r" (badvaddr) |
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| 124 | ); |
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| 125 | |||
| 126 | spinlock_lock(&AS->lock); |
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| 127 | asid = AS->asid; |
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| 128 | spinlock_unlock(&AS->lock); |
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| 129 | |||
| 130 | page_table_lock(AS, true); |
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| 131 | |||
| 132 | pte = find_mapping_and_check(badvaddr); |
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| 133 | if (!pte) |
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| 134 | goto fail; |
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| 135 | |||
| 136 | /* |
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| 137 | * Record access to PTE. |
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| 138 | */ |
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| 139 | pte->a = 1; |
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| 140 | |||
| 141 | // FIXME: Insert entry into PHT |
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| 142 | |||
| 143 | page_table_unlock(AS, true); |
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| 144 | return; |
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| 145 | |||
| 146 | fail: |
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| 147 | page_table_unlock(AS, true); |
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| 148 | pht_refill_fail(badvaddr, istate); |
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| 149 | } |
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| 150 | |||
| 151 | |||
| 152 | /** Print contents of Page Hash Table. */ |
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| 153 | void tlb_print(void) |
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| 154 | { |
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| 155 | } |