Go to most recent revision | Details | 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) { |
548 | jermar | 82 | newpt = frame_alloc(FRAME_KA, ONE_FRAME); |
125 | jermar | 83 | memsetb(newpt, PAGE_SIZE, 0); |
84 | SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt)); |
||
548 | jermar | 85 | SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE); |
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) { |
548 | jermar | 91 | newpt = frame_alloc(FRAME_KA, ONE_FRAME); |
125 | jermar | 92 | memsetb(newpt, PAGE_SIZE, 0); |
93 | SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt)); |
||
548 | jermar | 94 | SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE); |
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) { |
548 | jermar | 100 | newpt = frame_alloc(FRAME_KA, ONE_FRAME); |
125 | jermar | 101 | memsetb(newpt, PAGE_SIZE, 0); |
102 | SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt)); |
||
548 | jermar | 103 | SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE); |
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 | } |