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| 1 | jermar | 1 | /* |
| 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 | #include <mm/page.h> |
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| 120 | jermar | 30 | #include <mm/frame.h> |
| 1 | jermar | 31 | #include <arch/mm/page.h> |
| 116 | jermar | 32 | #include <arch/types.h> |
| 33 | #include <typedefs.h> |
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| 120 | jermar | 34 | #include <arch/asm.h> |
| 195 | vana | 35 | #include <memstr.h> |
| 684 | jermar | 36 | #include <debug.h> |
| 1 | jermar | 37 | |
| 684 | jermar | 38 | /** Virtual operations for page subsystem. */ |
| 39 | page_operations_t *page_operations = NULL; |
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| 40 | |||
| 1 | jermar | 41 | void page_init(void) |
| 226 | palkovsky | 42 | { |
| 23 | jermar | 43 | page_arch_init(); |
| 492 | jermar | 44 | page_mapping_insert(0x0, 0x0, PAGE_NOT_PRESENT, 0); |
| 1 | jermar | 45 | } |
| 116 | jermar | 46 | |
| 47 | /** Map memory structure |
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| 48 | * |
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| 49 | * Identity-map memory structure |
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| 50 | * considering possible crossings |
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| 51 | * of page boundaries. |
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| 52 | * |
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| 53 | * @param s Address of the structure. |
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| 54 | * @param size Size of the structure. |
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| 55 | */ |
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| 56 | void map_structure(__address s, size_t size) |
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| 57 | { |
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| 58 | int i, cnt, length; |
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| 59 | |||
| 226 | palkovsky | 60 | length = size + (s - (s & ~(PAGE_SIZE-1))); |
| 125 | jermar | 61 | cnt = length/PAGE_SIZE + (length%PAGE_SIZE>0); |
| 116 | jermar | 62 | |
| 125 | jermar | 63 | for (i = 0; i < cnt; i++) |
| 492 | jermar | 64 | page_mapping_insert(s + i*PAGE_SIZE, s + i*PAGE_SIZE, PAGE_NOT_CACHEABLE, 0); |
| 116 | jermar | 65 | |
| 66 | } |
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| 120 | jermar | 67 | |
| 68 | /** Map page to frame |
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| 69 | * |
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| 70 | * Map virtual address 'page' to physical address 'frame' |
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| 71 | * using 'flags'. Allocate and setup any missing page tables. |
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| 72 | * |
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| 73 | * @param page Virtual address of the page to be mapped. |
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| 74 | * @param frame Physical address of memory frame to which the mapping is done. |
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| 75 | * @param flags Flags to be used for mapping. |
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| 76 | * @param root Explicit PTL0 address. |
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| 77 | */ |
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| 492 | jermar | 78 | void page_mapping_insert(__address page, __address frame, int flags, __address root) |
| 120 | jermar | 79 | { |
| 684 | jermar | 80 | ASSERT(page_operations); |
| 81 | ASSERT(page_operations->mapping_insert); |
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| 82 | |||
| 83 | page_operations->mapping_insert(page, frame, flags, root); |
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| 120 | jermar | 84 | } |
| 391 | jermar | 85 | |
| 86 | /** Find mapping for virtual page |
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| 87 | * |
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| 88 | * Find mapping for virtual page. |
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| 89 | * |
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| 90 | * @param page Virtual page. |
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| 91 | * @param root PTL0 address if non-zero. |
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| 92 | * |
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| 93 | * @return NULL if there is no such mapping; entry from PTL3 describing the mapping otherwise. |
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| 94 | */ |
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| 492 | jermar | 95 | pte_t *page_mapping_find(__address page, __address root) |
| 391 | jermar | 96 | { |
| 684 | jermar | 97 | ASSERT(page_operations); |
| 98 | ASSERT(page_operations->mapping_find); |
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| 391 | jermar | 99 | |
| 684 | jermar | 100 | return page_operations->mapping_find(page, root); |
| 391 | jermar | 101 | } |