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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> |
40 | #include <print.h> |
41 | #include <panic.h> |
41 | #include <panic.h> |
42 | #include <align.h> |
42 | #include <align.h> |
43 | 43 | ||
44 | /* Definitions for identity page mapper */ |
44 | /* Definitions for identity page mapper */ |
45 | pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE))); |
45 | pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE))); |
46 | pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE))); |
46 | pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE))); |
47 | pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE))); |
47 | pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE))); |
48 | extern pte_t ptl_0; /* From boot.S */ |
48 | extern pte_t ptl_0; /* From boot.S */ |
49 | 49 | ||
50 | #define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
50 | #define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
51 | #define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
51 | #define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
52 | #define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
52 | #define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
53 | 53 | ||
54 | #define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page)))) |
54 | #define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page)))) |
55 | #define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page)))) |
55 | #define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page)))) |
56 | #define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page)))) |
56 | #define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page)))) |
57 | 57 | ||
58 | #define SETUP_PTL1(ptl0, page, tgt) { \ |
58 | #define SETUP_PTL1(ptl0, page, tgt) { \ |
59 | SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
59 | SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
60 | SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
60 | SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
61 | } |
61 | } |
62 | #define SETUP_PTL2(ptl1, page, tgt) { \ |
62 | #define SETUP_PTL2(ptl1, page, tgt) { \ |
63 | SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
63 | SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
64 | SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
64 | SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
65 | } |
65 | } |
66 | #define SETUP_PTL3(ptl2, page, tgt) { \ |
66 | #define SETUP_PTL3(ptl2, page, tgt) { \ |
67 | SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
67 | SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
68 | SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
68 | SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
69 | } |
69 | } |
70 | #define SETUP_FRAME(ptl3, page, tgt) { \ |
70 | #define SETUP_FRAME(ptl3, page, tgt) { \ |
71 | SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
71 | SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
72 | SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
72 | SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
73 | } |
73 | } |
74 | void page_arch_init(void) |
74 | void page_arch_init(void) |
75 | { |
75 | { |
76 | __address cur; |
76 | __address cur; |
77 | int i; |
77 | int i; |
78 | int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL; |
78 | int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL; |
79 | 79 | ||
80 | if (config.cpu_active == 1) { |
80 | if (config.cpu_active == 1) { |
81 | page_mapping_operations = &pt_mapping_operations; |
81 | page_mapping_operations = &pt_mapping_operations; |
82 | 82 | ||
83 | /* |
83 | /* |
84 | * PA2KA(identity) mapping for all frames. |
84 | * PA2KA(identity) mapping for all frames. |
85 | */ |
85 | */ |
86 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
86 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
87 | /* Standard identity mapping */ |
87 | /* Standard identity mapping */ |
88 | page_mapping_insert(AS_KERNEL, PA2KA_IDENT(cur), cur, identity_flags); |
88 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags); |
89 | } |
89 | } |
90 | /* Upper kernel mapping |
90 | /* Upper kernel mapping |
91 | * - from zero to top of kernel (include bottom addresses |
91 | * - from zero to top of kernel (include bottom addresses |
92 | * because some are needed for init ) |
92 | * because some are needed for init ) |
93 | */ |
93 | */ |
94 | for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) { |
94 | for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) { |
95 | page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags); |
95 | page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags); |
96 | } |
96 | } |
97 | for (i=0; i < init.cnt; i++) { |
97 | for (i=0; i < init.cnt; i++) { |
98 | for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) { |
98 | for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) { |
99 | page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags); |
99 | page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags); |
100 | } |
100 | } |
101 | } |
101 | } |
102 | 102 | ||
103 | exc_register(14, "page_fault", (iroutine)page_fault); |
103 | exc_register(14, "page_fault", (iroutine)page_fault); |
104 | write_cr3((__address) AS_KERNEL->page_table); |
104 | write_cr3((__address) AS_KERNEL->page_table); |
105 | } |
105 | } |
106 | else { |
106 | else { |
107 | write_cr3((__address) AS_KERNEL->page_table); |
107 | write_cr3((__address) AS_KERNEL->page_table); |
108 | } |
108 | } |
109 | } |
109 | } |
110 | 110 | ||
111 | /** Identity page mapper |
111 | /** Identity page mapper |
112 | * |
112 | * |
113 | * We need to map whole physical memory identically before the page subsystem |
113 | * We need to map whole physical memory identically before the page subsystem |
114 | * is initializaed. This thing clears page table and fills in the specific |
114 | * is initializaed. This thing clears page table and fills in the specific |
115 | * items. |
115 | * items. |
116 | */ |
116 | */ |
117 | void ident_page_fault(int n, istate_t *istate) |
117 | void ident_page_fault(int n, istate_t *istate) |
118 | { |
118 | { |
119 | __address page; |
119 | __address page; |
120 | static __address oldpage = 0; |
120 | static __address oldpage = 0; |
121 | pte_t *aptl_1, *aptl_2, *aptl_3; |
121 | pte_t *aptl_1, *aptl_2, *aptl_3; |
122 | 122 | ||
123 | page = read_cr2(); |
123 | page = read_cr2(); |
124 | if (oldpage) { |
124 | if (oldpage) { |
125 | /* Unmap old address */ |
125 | /* Unmap old address */ |
126 | aptl_1 = PTL1_ADDR(&ptl_0, oldpage); |
126 | aptl_1 = PTL1_ADDR(&ptl_0, oldpage); |
127 | aptl_2 = PTL2_ADDR(aptl_1, oldpage); |
127 | aptl_2 = PTL2_ADDR(aptl_1, oldpage); |
128 | aptl_3 = PTL3_ADDR(aptl_2, oldpage); |
128 | aptl_3 = PTL3_ADDR(aptl_2, oldpage); |
129 | 129 | ||
130 | SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
130 | SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
131 | if (aptl_3 == helper_ptl3) |
131 | if (KA2PA(aptl_3) == KA2PA(helper_ptl3)) |
132 | SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
132 | SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
133 | if (aptl_2 == helper_ptl2) |
133 | if (KA2PA(aptl_2) == KA2PA(helper_ptl2)) |
134 | SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
134 | SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
135 | if (aptl_1 == helper_ptl1) |
135 | if (KA2PA(aptl_1) == KA2PA(helper_ptl1)) |
136 | SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
136 | SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
137 | } |
137 | } |
138 | if (PTL1_PRESENT(&ptl_0, page)) |
138 | if (PTL1_PRESENT(&ptl_0, page)) |
139 | aptl_1 = PTL1_ADDR(&ptl_0, page); |
139 | aptl_1 = PTL1_ADDR(&ptl_0, page); |
140 | else { |
140 | else { |
141 | SETUP_PTL1(&ptl_0, page, helper_ptl1); |
141 | SETUP_PTL1(&ptl_0, page, helper_ptl1); |
142 | aptl_1 = helper_ptl1; |
142 | aptl_1 = helper_ptl1; |
143 | } |
143 | } |
144 | 144 | ||
145 | if (PTL2_PRESENT(aptl_1, page)) |
145 | if (PTL2_PRESENT(aptl_1, page)) |
146 | aptl_2 = PTL2_ADDR(aptl_1, page); |
146 | aptl_2 = PTL2_ADDR(aptl_1, page); |
147 | else { |
147 | else { |
148 | SETUP_PTL2(aptl_1, page, helper_ptl2); |
148 | SETUP_PTL2(aptl_1, page, helper_ptl2); |
149 | aptl_2 = helper_ptl2; |
149 | aptl_2 = helper_ptl2; |
150 | } |
150 | } |
151 | 151 | ||
152 | if (PTL3_PRESENT(aptl_2, page)) |
152 | if (PTL3_PRESENT(aptl_2, page)) |
153 | aptl_3 = PTL3_ADDR(aptl_2, page); |
153 | aptl_3 = PTL3_ADDR(aptl_2, page); |
154 | else { |
154 | else { |
155 | SETUP_PTL3(aptl_2, page, helper_ptl3); |
155 | SETUP_PTL3(aptl_2, page, helper_ptl3); |
156 | aptl_3 = helper_ptl3; |
156 | aptl_3 = helper_ptl3; |
157 | } |
157 | } |
158 | 158 | ||
159 | SETUP_FRAME(aptl_3, page, page); |
159 | SETUP_FRAME(aptl_3, page, page); |
160 | 160 | ||
161 | oldpage = page; |
161 | oldpage = page; |
162 | } |
162 | } |
163 | 163 | ||
164 | void page_fault(int n, istate_t *istate) |
164 | void page_fault(int n, istate_t *istate) |
165 | { |
165 | { |
166 | __address page; |
166 | __address page; |
167 | 167 | ||
168 | page = read_cr2(); |
168 | page = read_cr2(); |
169 | if (!as_page_fault(page)) { |
169 | if (!as_page_fault(page)) { |
170 | print_info_errcode(n, istate); |
170 | print_info_errcode(n, istate); |
171 | printf("Page fault address: %Q\n", page); |
171 | printf("Page fault address: %Q\n", page); |
172 | panic("page fault\n"); |
172 | panic("page fault\n"); |
173 | } |
173 | } |
174 | } |
174 | } |
175 | 175 |