Rev 533 | Rev 548 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | #include <mm/page.h> |
||
| 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> |
||
| 120 | jermar | 34 | #include <arch/asm.h> |
| 195 | vana | 35 | #include <memstr.h> |
| 1 | jermar | 36 | |
| 37 | void page_init(void) |
||
| 226 | palkovsky | 38 | { |
| 23 | jermar | 39 | page_arch_init(); |
| 492 | jermar | 40 | page_mapping_insert(0x0, 0x0, PAGE_NOT_PRESENT, 0); |
| 1 | jermar | 41 | } |
| 116 | jermar | 42 | |
| 43 | /** Map memory structure |
||
| 44 | * |
||
| 45 | * Identity-map memory structure |
||
| 46 | * considering possible crossings |
||
| 47 | * of page boundaries. |
||
| 48 | * |
||
| 49 | * @param s Address of the structure. |
||
| 50 | * @param size Size of the structure. |
||
| 51 | */ |
||
| 52 | void map_structure(__address s, size_t size) |
||
| 53 | { |
||
| 54 | int i, cnt, length; |
||
| 55 | |||
| 226 | palkovsky | 56 | length = size + (s - (s & ~(PAGE_SIZE-1))); |
| 125 | jermar | 57 | cnt = length/PAGE_SIZE + (length%PAGE_SIZE>0); |
| 116 | jermar | 58 | |
| 125 | jermar | 59 | for (i = 0; i < cnt; i++) |
| 492 | jermar | 60 | page_mapping_insert(s + i*PAGE_SIZE, s + i*PAGE_SIZE, PAGE_NOT_CACHEABLE, 0); |
| 116 | jermar | 61 | |
| 62 | } |
||
| 120 | jermar | 63 | |
| 64 | /** Map page to frame |
||
| 65 | * |
||
| 66 | * Map virtual address 'page' to physical address 'frame' |
||
| 67 | * using 'flags'. Allocate and setup any missing page tables. |
||
| 68 | * |
||
| 69 | * @param page Virtual address of the page to be mapped. |
||
| 70 | * @param frame Physical address of memory frame to which the mapping is done. |
||
| 71 | * @param flags Flags to be used for mapping. |
||
| 72 | * @param root Explicit PTL0 address. |
||
| 73 | */ |
||
| 492 | jermar | 74 | void page_mapping_insert(__address page, __address frame, int flags, __address root) |
| 120 | jermar | 75 | { |
| 125 | jermar | 76 | pte_t *ptl0, *ptl1, *ptl2, *ptl3; |
| 77 | __address newpt; |
||
| 120 | jermar | 78 | |
| 158 | decky | 79 | ptl0 = (pte_t *) PA2KA(root ? root : (__address) GET_PTL0_ADDRESS()); |
| 120 | jermar | 80 | |
| 125 | jermar | 81 | if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) { |
| 533 | bondari | 82 | newpt = frame_alloc(FRAME_KA, 0); |
| 125 | jermar | 83 | memsetb(newpt, PAGE_SIZE, 0); |
| 84 | SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt)); |
||
| 251 | palkovsky | 85 | SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC); |
| 125 | jermar | 86 | } |
| 120 | jermar | 87 | |
| 125 | jermar | 88 | ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page))); |
| 120 | jermar | 89 | |
| 125 | jermar | 90 | if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) { |
| 533 | bondari | 91 | newpt = frame_alloc(FRAME_KA, 0); |
| 125 | jermar | 92 | memsetb(newpt, PAGE_SIZE, 0); |
| 93 | SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt)); |
||
| 251 | palkovsky | 94 | SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC); |
| 125 | jermar | 95 | } |
| 120 | jermar | 96 | |
| 125 | jermar | 97 | ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page))); |
| 120 | jermar | 98 | |
| 125 | jermar | 99 | if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) { |
| 533 | bondari | 100 | newpt = frame_alloc(FRAME_KA, 0); |
| 125 | jermar | 101 | memsetb(newpt, PAGE_SIZE, 0); |
| 102 | SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt)); |
||
| 251 | palkovsky | 103 | SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC); |
| 125 | jermar | 104 | } |
| 120 | jermar | 105 | |
| 125 | jermar | 106 | ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page))); |
| 120 | jermar | 107 | |
| 125 | jermar | 108 | SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(page), frame); |
| 109 | SET_FRAME_FLAGS(ptl3, PTL3_INDEX(page), flags); |
||
| 120 | jermar | 110 | } |
| 391 | jermar | 111 | |
| 112 | /** Find mapping for virtual page |
||
| 113 | * |
||
| 114 | * Find mapping for virtual page. |
||
| 115 | * |
||
| 116 | * @param page Virtual page. |
||
| 117 | * @param root PTL0 address if non-zero. |
||
| 118 | * |
||
| 119 | * @return NULL if there is no such mapping; entry from PTL3 describing the mapping otherwise. |
||
| 120 | */ |
||
| 492 | jermar | 121 | pte_t *page_mapping_find(__address page, __address root) |
| 391 | jermar | 122 | { |
| 123 | pte_t *ptl0, *ptl1, *ptl2, *ptl3; |
||
| 124 | |||
| 125 | ptl0 = (pte_t *) PA2KA(root ? root : (__address) GET_PTL0_ADDRESS()); |
||
| 126 | |||
| 127 | if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) |
||
| 128 | return NULL; |
||
| 129 | |||
| 130 | ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page))); |
||
| 131 | |||
| 132 | if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) |
||
| 133 | return NULL; |
||
| 134 | |||
| 135 | ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page))); |
||
| 136 | |||
| 137 | if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) |
||
| 138 | return NULL; |
||
| 139 | |||
| 140 | ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page))); |
||
| 141 | |||
| 142 | return &ptl3[PTL3_INDEX(page)]; |
||
| 143 | } |