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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <arch/mm/page.h> |
29 | #include <arch/mm/page.h> |
30 | #include <genarch/mm/page_pt.h> |
30 | #include <genarch/mm/page_pt.h> |
31 | #include <arch/mm/frame.h> |
31 | #include <arch/mm/frame.h> |
32 | #include <mm/page.h> |
32 | #include <mm/page.h> |
33 | #include <mm/frame.h> |
33 | #include <mm/frame.h> |
34 | #include <mm/as.h> |
34 | #include <mm/as.h> |
35 | #include <arch/interrupt.h> |
35 | #include <arch/interrupt.h> |
36 | #include <arch/asm.h> |
36 | #include <arch/asm.h> |
37 | #include <config.h> |
37 | #include <config.h> |
38 | #include <memstr.h> |
38 | #include <memstr.h> |
39 | #include <interrupt.h> |
39 | #include <interrupt.h> |
- | 40 | #include <print.h> |
|
- | 41 | #include <panic.h> |
|
- | 42 | ||
- | 43 | /* Definitions for identity page mapper */ |
|
- | 44 | pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE))); |
|
- | 45 | pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE))); |
|
- | 46 | pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE))); |
|
- | 47 | extern pte_t ptl_0; /* From boot.S */ |
|
- | 48 | ||
- | 49 | #define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
|
- | 50 | #define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
|
- | 51 | #define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
|
- | 52 | ||
- | 53 | #define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page)))) |
|
- | 54 | #define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page)))) |
|
- | 55 | #define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page)))) |
|
- | 56 | ||
- | 57 | #define SETUP_PTL1(ptl0, page, tgt) { \ |
|
- | 58 | SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
|
- | 59 | SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
|
- | 60 | } |
|
- | 61 | #define SETUP_PTL2(ptl1, page, tgt) { \ |
|
- | 62 | SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
|
- | 63 | SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
|
- | 64 | } |
|
- | 65 | #define SETUP_PTL3(ptl2, page, tgt) { \ |
|
- | 66 | SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
|
- | 67 | SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
|
- | 68 | } |
|
- | 69 | #define SETUP_FRAME(ptl3, page, tgt) { \ |
|
- | 70 | SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
|
- | 71 | SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
|
- | 72 | } |
|
40 | 73 | ||
41 | void page_arch_init(void) |
74 | void page_arch_init(void) |
42 | { |
75 | { |
43 | __address cur; |
76 | __address cur; |
44 | int flags; |
77 | int flags; |
45 | 78 | ||
46 | if (config.cpu_active == 1) { |
79 | if (config.cpu_active == 1) { |
47 | page_mapping_operations = &pt_mapping_operations; |
80 | page_mapping_operations = &pt_mapping_operations; |
48 | 81 | ||
49 | /* |
82 | /* |
50 | * PA2KA(identity) mapping for all frames. |
83 | * PA2KA(identity) mapping for all frames. |
51 | */ |
84 | */ |
52 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
85 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
53 | flags = PAGE_CACHEABLE | PAGE_EXEC; |
86 | flags = PAGE_CACHEABLE | PAGE_EXEC; |
54 | if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size)) |
87 | if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size)) |
55 | flags |= PAGE_GLOBAL; |
88 | flags |= PAGE_GLOBAL; |
56 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
89 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
57 | } |
90 | } |
58 | exc_register(14, "page_fault", (iroutine)page_fault); |
91 | exc_register(14, "page_fault", (iroutine)page_fault); |
59 | write_cr3((__address) AS_KERNEL->page_table); |
92 | write_cr3((__address) AS_KERNEL->page_table); |
60 | } |
93 | } |
61 | else { |
94 | else { |
62 | write_cr3((__address) AS_KERNEL->page_table); |
95 | write_cr3((__address) AS_KERNEL->page_table); |
63 | } |
96 | } |
- | 97 | } |
|
- | 98 | ||
- | 99 | /** Identity page mapper |
|
- | 100 | * |
|
- | 101 | * We need to map whole physical memory identically before the page subsystem |
|
- | 102 | * is initializaed. This thing clears page table and fills in the specific |
|
- | 103 | * items. |
|
- | 104 | */ |
|
- | 105 | void ident_page_fault(int n, istate_t *istate) |
|
- | 106 | { |
|
- | 107 | __address page; |
|
- | 108 | static __address oldpage = 0; |
|
- | 109 | pte_t *aptl_1, *aptl_2, *aptl_3; |
|
- | 110 | ||
- | 111 | page = read_cr2(); |
|
- | 112 | if (oldpage) { |
|
- | 113 | /* Unmap old address */ |
|
- | 114 | aptl_1 = PTL1_ADDR(&ptl_0, oldpage); |
|
- | 115 | aptl_2 = PTL2_ADDR(aptl_1, oldpage); |
|
- | 116 | aptl_3 = PTL3_ADDR(aptl_2, oldpage); |
|
- | 117 | ||
- | 118 | SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
|
- | 119 | if (aptl_3 == helper_ptl3) |
|
- | 120 | SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
|
- | 121 | if (aptl_2 == helper_ptl2) |
|
- | 122 | SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
|
- | 123 | if (aptl_1 == helper_ptl1) |
|
- | 124 | SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
|
- | 125 | } |
|
- | 126 | if (PTL1_PRESENT(&ptl_0, page)) |
|
- | 127 | aptl_1 = PTL1_ADDR(&ptl_0, page); |
|
- | 128 | else { |
|
- | 129 | SETUP_PTL1(&ptl_0, page, helper_ptl1); |
|
- | 130 | aptl_1 = helper_ptl1; |
|
- | 131 | } |
|
- | 132 | ||
- | 133 | if (PTL2_PRESENT(aptl_1, page)) |
|
- | 134 | aptl_2 = PTL2_ADDR(aptl_1, page); |
|
- | 135 | else { |
|
- | 136 | SETUP_PTL2(aptl_1, page, helper_ptl2); |
|
- | 137 | aptl_2 = helper_ptl2; |
|
- | 138 | } |
|
- | 139 | ||
- | 140 | if (PTL3_PRESENT(aptl_2, page)) |
|
- | 141 | aptl_3 = PTL3_ADDR(aptl_2, page); |
|
- | 142 | else { |
|
- | 143 | SETUP_PTL3(aptl_2, page, helper_ptl3); |
|
- | 144 | aptl_3 = helper_ptl3; |
|
- | 145 | } |
|
- | 146 | ||
- | 147 | SETUP_FRAME(aptl_3, page, page); |
|
- | 148 | ||
- | 149 | oldpage = page; |
|
- | 150 | } |
|
- | 151 | ||
- | 152 | void page_fault(int n, istate_t *istate) |
|
- | 153 | { |
|
- | 154 | __address page; |
|
- | 155 | ||
- | 156 | page = read_cr2(); |
|
- | 157 | if (!as_page_fault(page)) { |
|
- | 158 | print_info_errcode(n, istate); |
|
- | 159 | printf("Page fault address: %Q\n", page); |
|
- | 160 | panic("page fault\n"); |
|
- | 161 | } |
|
64 | } |
162 | } |
65 | 163 |