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1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
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 | /** @addtogroup arm32mm |
29 | /** @addtogroup arm32mm |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | * @brief Paging related declarations. |
33 | * @brief Paging related declarations. |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #ifndef KERN_arm32_PAGE_H_ |
36 | #ifndef KERN_arm32_PAGE_H_ |
37 | #define KERN_arm32_PAGE_H_ |
37 | #define KERN_arm32_PAGE_H_ |
38 | 38 | ||
39 | #include <arch/mm/frame.h> |
39 | #include <arch/mm/frame.h> |
40 | #include <mm/mm.h> |
40 | #include <mm/mm.h> |
41 | #include <arch/exception.h> |
41 | #include <arch/exception.h> |
42 | 42 | ||
43 | #define PAGE_WIDTH FRAME_WIDTH |
43 | #define PAGE_WIDTH FRAME_WIDTH |
44 | #define PAGE_SIZE FRAME_SIZE |
44 | #define PAGE_SIZE FRAME_SIZE |
45 | 45 | ||
46 | #ifndef __ASM__ |
46 | #ifndef __ASM__ |
47 | # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
47 | # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
48 | # define PA2KA(x) (((uintptr_t) (x)) + 0x80000000) |
48 | # define PA2KA(x) (((uintptr_t) (x)) + 0x80000000) |
49 | #else |
49 | #else |
50 | # define KA2PA(x) ((x) - 0x80000000) |
50 | # define KA2PA(x) ((x) - 0x80000000) |
51 | # define PA2KA(x) ((x) + 0x80000000) |
51 | # define PA2KA(x) ((x) + 0x80000000) |
52 | #endif |
52 | #endif |
53 | 53 | ||
54 | #ifdef KERNEL |
54 | #ifdef KERNEL |
55 | 55 | ||
56 | /* Number of entries in each level. */ |
56 | /* Number of entries in each level. */ |
57 | #define PTL0_ENTRIES_ARCH (2 << 12) /* 4096 */ |
57 | #define PTL0_ENTRIES_ARCH (2 << 12) /* 4096 */ |
58 | #define PTL1_ENTRIES_ARCH 0 |
58 | #define PTL1_ENTRIES_ARCH 0 |
59 | #define PTL2_ENTRIES_ARCH 0 |
59 | #define PTL2_ENTRIES_ARCH 0 |
60 | /* coarse page tables used (256 * 4 = 1KB per page) */ |
60 | /* coarse page tables used (256 * 4 = 1KB per page) */ |
61 | #define PTL3_ENTRIES_ARCH (2 << 8) /* 256 */ |
61 | #define PTL3_ENTRIES_ARCH (2 << 8) /* 256 */ |
62 | 62 | ||
63 | /* Page table sizes for each level. */ |
63 | /* Page table sizes for each level. */ |
64 | #define PTL0_SIZE_ARCH FOUR_FRAMES |
64 | #define PTL0_SIZE_ARCH FOUR_FRAMES |
65 | #define PTL1_SIZE_ARCH 0 |
65 | #define PTL1_SIZE_ARCH 0 |
66 | #define PTL2_SIZE_ARCH 0 |
66 | #define PTL2_SIZE_ARCH 0 |
67 | #define PTL3_SIZE_ARCH ONE_FRAME |
67 | #define PTL3_SIZE_ARCH ONE_FRAME |
68 | 68 | ||
69 | /* Macros calculating indices into page tables for each level. */ |
69 | /* Macros calculating indices into page tables for each level. */ |
70 | #define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 20) & 0xfff) |
70 | #define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 20) & 0xfff) |
71 | #define PTL1_INDEX_ARCH(vaddr) 0 |
71 | #define PTL1_INDEX_ARCH(vaddr) 0 |
72 | #define PTL2_INDEX_ARCH(vaddr) 0 |
72 | #define PTL2_INDEX_ARCH(vaddr) 0 |
73 | #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x0ff) |
73 | #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x0ff) |
74 | 74 | ||
75 | /* Get PTE address accessors for each level. */ |
75 | /* Get PTE address accessors for each level. */ |
76 | #define GET_PTL1_ADDRESS_ARCH(ptl0, i) \ |
76 | #define GET_PTL1_ADDRESS_ARCH(ptl0, i) \ |
77 | ((pte_t *) ((((pte_level0_t *)(ptl0))[(i)]).coarse_table_addr << 10)) |
77 | ((pte_t *) ((((pte_level0_t *)(ptl0))[(i)]).coarse_table_addr << 10)) |
78 | #define GET_PTL2_ADDRESS_ARCH(ptl1, i) \ |
78 | #define GET_PTL2_ADDRESS_ARCH(ptl1, i) \ |
79 | (ptl1) |
79 | (ptl1) |
80 | #define GET_PTL3_ADDRESS_ARCH(ptl2, i) \ |
80 | #define GET_PTL3_ADDRESS_ARCH(ptl2, i) \ |
81 | (ptl2) |
81 | (ptl2) |
82 | #define GET_FRAME_ADDRESS_ARCH(ptl3, i) \ |
82 | #define GET_FRAME_ADDRESS_ARCH(ptl3, i) \ |
83 | ((uintptr_t) ((((pte_level1_t *)(ptl3))[(i)]).frame_base_addr << 12)) |
83 | ((uintptr_t) ((((pte_level1_t *)(ptl3))[(i)]).frame_base_addr << 12)) |
84 | 84 | ||
85 | /* Set PTE address accessors for each level. */ |
85 | /* Set PTE address accessors for each level. */ |
86 | #define SET_PTL0_ADDRESS_ARCH(ptl0) \ |
86 | #define SET_PTL0_ADDRESS_ARCH(ptl0) \ |
87 | (set_ptl0_addr((pte_level0_t *) (ptl0))) |
87 | (set_ptl0_addr((pte_level0_t *) (ptl0))) |
88 | #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \ |
88 | #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \ |
89 | (((pte_level0_t *) (ptl0))[(i)].coarse_table_addr = (a) >> 10) |
89 | (((pte_level0_t *) (ptl0))[(i)].coarse_table_addr = (a) >> 10) |
90 | #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
90 | #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
91 | #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
91 | #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
92 | #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \ |
92 | #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \ |
93 | (((pte_level1_t *) (ptl3))[(i)].frame_base_addr = (a) >> 12) |
93 | (((pte_level1_t *) (ptl3))[(i)].frame_base_addr = (a) >> 12) |
94 | 94 | ||
95 | /* Get PTE flags accessors for each level. */ |
95 | /* Get PTE flags accessors for each level. */ |
96 | #define GET_PTL1_FLAGS_ARCH(ptl0, i) \ |
96 | #define GET_PTL1_FLAGS_ARCH(ptl0, i) \ |
97 | get_pt_level0_flags((pte_level0_t *) (ptl0), (size_t) (i)) |
97 | get_pt_level0_flags((pte_level0_t *) (ptl0), (size_t) (i)) |
98 | #define GET_PTL2_FLAGS_ARCH(ptl1, i) \ |
98 | #define GET_PTL2_FLAGS_ARCH(ptl1, i) \ |
99 | PAGE_PRESENT |
99 | PAGE_PRESENT |
100 | #define GET_PTL3_FLAGS_ARCH(ptl2, i) \ |
100 | #define GET_PTL3_FLAGS_ARCH(ptl2, i) \ |
101 | PAGE_PRESENT |
101 | PAGE_PRESENT |
102 | #define GET_FRAME_FLAGS_ARCH(ptl3, i) \ |
102 | #define GET_FRAME_FLAGS_ARCH(ptl3, i) \ |
103 | get_pt_level1_flags((pte_level1_t *) (ptl3), (size_t) (i)) |
103 | get_pt_level1_flags((pte_level1_t *) (ptl3), (size_t) (i)) |
104 | 104 | ||
105 | /* Set PTE flags accessors for each level. */ |
105 | /* Set PTE flags accessors for each level. */ |
106 | #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \ |
106 | #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \ |
107 | set_pt_level0_flags((pte_level0_t *) (ptl0), (size_t) (i), (x)) |
107 | set_pt_level0_flags((pte_level0_t *) (ptl0), (size_t) (i), (x)) |
108 | #define SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
108 | #define SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
109 | #define SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
109 | #define SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
110 | #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) \ |
110 | #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) \ |
111 | set_pt_level1_flags((pte_level1_t *) (ptl3), (size_t) (i), (x)) |
111 | set_pt_level1_flags((pte_level1_t *) (ptl3), (size_t) (i), (x)) |
112 | 112 | ||
113 | /* Macros for querying the last-level PTE entries. */ |
113 | /* Macros for querying the last-level PTE entries. */ |
114 | #define PTE_VALID_ARCH(pte) \ |
114 | #define PTE_VALID_ARCH(pte) \ |
115 | (*((uint32_t *) (pte)) != 0) |
115 | (*((uint32_t *) (pte)) != 0) |
116 | #define PTE_PRESENT_ARCH(pte) \ |
116 | #define PTE_PRESENT_ARCH(pte) \ |
117 | (((pte_level0_t *) (pte))->descriptor_type != 0) |
117 | (((pte_level0_t *) (pte))->descriptor_type != 0) |
118 | #define PTE_GET_FRAME_ARCH(pte) \ |
118 | #define PTE_GET_FRAME_ARCH(pte) \ |
119 | (((pte_level1_t *) (pte))->frame_base_addr << FRAME_WIDTH) |
119 | (((pte_level1_t *) (pte))->frame_base_addr << FRAME_WIDTH) |
120 | #define PTE_WRITABLE_ARCH(pte) \ |
120 | #define PTE_WRITABLE_ARCH(pte) \ |
121 | (((pte_level1_t *) (pte))->access_permission_0 == \ |
121 | (((pte_level1_t *) (pte))->access_permission_0 == \ |
122 | PTE_AP_USER_RW_KERNEL_RW) |
122 | PTE_AP_USER_RW_KERNEL_RW) |
123 | #define PTE_EXECUTABLE_ARCH(pte) \ |
123 | #define PTE_EXECUTABLE_ARCH(pte) \ |
124 | 1 |
124 | 1 |
125 | 125 | ||
126 | #ifndef __ASM__ |
126 | #ifndef __ASM__ |
127 | 127 | ||
128 | /** Level 0 page table entry. */ |
128 | /** Level 0 page table entry. */ |
129 | typedef struct { |
129 | typedef struct { |
130 | /* 0b01 for coarse tables, see below for details */ |
130 | /* 0b01 for coarse tables, see below for details */ |
131 | unsigned descriptor_type : 2; |
131 | unsigned descriptor_type : 2; |
132 | unsigned impl_specific : 3; |
132 | unsigned impl_specific : 3; |
133 | unsigned domain : 4; |
133 | unsigned domain : 4; |
134 | unsigned should_be_zero : 1; |
134 | unsigned should_be_zero : 1; |
135 | 135 | ||
136 | /* Pointer to the coarse 2nd level page table (holding entries for small |
136 | /* Pointer to the coarse 2nd level page table (holding entries for small |
137 | * (4KB) or large (64KB) pages. ARM also supports fine 2nd level page |
137 | * (4KB) or large (64KB) pages. ARM also supports fine 2nd level page |
138 | * tables that may hold even tiny pages (1KB) but they are bigger (4KB |
138 | * tables that may hold even tiny pages (1KB) but they are bigger (4KB |
139 | * per table in comparison with 1KB per the coarse table) |
139 | * per table in comparison with 1KB per the coarse table) |
140 | */ |
140 | */ |
141 | unsigned coarse_table_addr : 22; |
141 | unsigned coarse_table_addr : 22; |
142 | } ATTRIBUTE_PACKED pte_level0_t; |
142 | } ATTRIBUTE_PACKED pte_level0_t; |
143 | 143 | ||
144 | /** Level 1 page table entry (small (4KB) pages used). */ |
144 | /** Level 1 page table entry (small (4KB) pages used). */ |
145 | typedef struct { |
145 | typedef struct { |
146 | 146 | ||
147 | /* 0b10 for small pages */ |
147 | /* 0b10 for small pages */ |
148 | unsigned descriptor_type : 2; |
148 | unsigned descriptor_type : 2; |
149 | unsigned bufferable : 1; |
149 | unsigned bufferable : 1; |
150 | unsigned cacheable : 1; |
150 | unsigned cacheable : 1; |
151 | 151 | ||
152 | /* access permissions for each of 4 subparts of a page |
152 | /* access permissions for each of 4 subparts of a page |
153 | * (for each 1KB when small pages used */ |
153 | * (for each 1KB when small pages used */ |
154 | unsigned access_permission_0 : 2; |
154 | unsigned access_permission_0 : 2; |
155 | unsigned access_permission_1 : 2; |
155 | unsigned access_permission_1 : 2; |
156 | unsigned access_permission_2 : 2; |
156 | unsigned access_permission_2 : 2; |
157 | unsigned access_permission_3 : 2; |
157 | unsigned access_permission_3 : 2; |
158 | unsigned frame_base_addr : 20; |
158 | unsigned frame_base_addr : 20; |
159 | } ATTRIBUTE_PACKED pte_level1_t; |
159 | } ATTRIBUTE_PACKED pte_level1_t; |
160 | 160 | ||
161 | 161 | ||
162 | /* Level 1 page tables access permissions */ |
162 | /* Level 1 page tables access permissions */ |
163 | 163 | ||
164 | /** User mode: no access, privileged mode: no access. */ |
164 | /** User mode: no access, privileged mode: no access. */ |
165 | #define PTE_AP_USER_NO_KERNEL_NO 0 |
165 | #define PTE_AP_USER_NO_KERNEL_NO 0 |
166 | 166 | ||
167 | /** User mode: no access, privileged mode: read/write. */ |
167 | /** User mode: no access, privileged mode: read/write. */ |
168 | #define PTE_AP_USER_NO_KERNEL_RW 1 |
168 | #define PTE_AP_USER_NO_KERNEL_RW 1 |
169 | 169 | ||
170 | /** User mode: read only, privileged mode: read/write. */ |
170 | /** User mode: read only, privileged mode: read/write. */ |
171 | #define PTE_AP_USER_RO_KERNEL_RW 2 |
171 | #define PTE_AP_USER_RO_KERNEL_RW 2 |
172 | 172 | ||
173 | /** User mode: read/write, privileged mode: read/write. */ |
173 | /** User mode: read/write, privileged mode: read/write. */ |
174 | #define PTE_AP_USER_RW_KERNEL_RW 3 |
174 | #define PTE_AP_USER_RW_KERNEL_RW 3 |
175 | 175 | ||
176 | 176 | ||
177 | /* pte_level0_t and pte_level1_t descriptor_type flags */ |
177 | /* pte_level0_t and pte_level1_t descriptor_type flags */ |
178 | 178 | ||
179 | /** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type). */ |
179 | /** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type). */ |
180 | #define PTE_DESCRIPTOR_NOT_PRESENT 0 |
180 | #define PTE_DESCRIPTOR_NOT_PRESENT 0 |
181 | 181 | ||
182 | /** pte_level0_t coarse page table flag (used in descriptor_type). */ |
182 | /** pte_level0_t coarse page table flag (used in descriptor_type). */ |
183 | #define PTE_DESCRIPTOR_COARSE_TABLE 1 |
183 | #define PTE_DESCRIPTOR_COARSE_TABLE 1 |
184 | 184 | ||
185 | /** pte_level1_t small page table flag (used in descriptor type). */ |
185 | /** pte_level1_t small page table flag (used in descriptor type). */ |
186 | #define PTE_DESCRIPTOR_SMALL_PAGE 2 |
186 | #define PTE_DESCRIPTOR_SMALL_PAGE 2 |
187 | 187 | ||
188 | 188 | ||
189 | /** Sets the address of level 0 page table. |
189 | /** Sets the address of level 0 page table. |
190 | * |
190 | * |
191 | * @param pt Pointer to the page table to set. |
191 | * @param pt Pointer to the page table to set. |
192 | */ |
192 | */ |
193 | static inline void set_ptl0_addr(pte_level0_t *pt) |
193 | static inline void set_ptl0_addr(pte_level0_t *pt) |
194 | { |
194 | { |
195 | asm volatile ( |
195 | asm volatile ( |
196 | "mcr p15, 0, %[pt], c2, c0, 0\n" |
196 | "mcr p15, 0, %[pt], c2, c0, 0\n" |
197 | :: [pt] "r" (pt) |
197 | :: [pt] "r" (pt) |
198 | ); |
198 | ); |
199 | } |
199 | } |
200 | 200 | ||
201 | 201 | ||
202 | /** Returns level 0 page table entry flags. |
202 | /** Returns level 0 page table entry flags. |
203 | * |
203 | * |
204 | * @param pt Level 0 page table. |
204 | * @param pt Level 0 page table. |
205 | * @param i Index of the entry to return. |
205 | * @param i Index of the entry to return. |
206 | */ |
206 | */ |
207 | static inline int get_pt_level0_flags(pte_level0_t *pt, size_t i) |
207 | static inline int get_pt_level0_flags(pte_level0_t *pt, size_t i) |
208 | { |
208 | { |
209 | pte_level0_t *p = &pt[i]; |
209 | pte_level0_t *p = &pt[i]; |
210 | int np = (p->descriptor_type == PTE_DESCRIPTOR_NOT_PRESENT); |
210 | int np = (p->descriptor_type == PTE_DESCRIPTOR_NOT_PRESENT); |
211 | 211 | ||
212 | return (np << PAGE_PRESENT_SHIFT) | (1 << PAGE_USER_SHIFT) | |
212 | return (np << PAGE_PRESENT_SHIFT) | (1 << PAGE_USER_SHIFT) | |
213 | (1 << PAGE_READ_SHIFT) | (1 << PAGE_WRITE_SHIFT) | |
213 | (1 << PAGE_READ_SHIFT) | (1 << PAGE_WRITE_SHIFT) | |
214 | (1 << PAGE_EXEC_SHIFT) | (1 << PAGE_CACHEABLE_SHIFT); |
214 | (1 << PAGE_EXEC_SHIFT) | (1 << PAGE_CACHEABLE_SHIFT); |
215 | } |
215 | } |
216 | 216 | ||
217 | /** Returns level 1 page table entry flags. |
217 | /** Returns level 1 page table entry flags. |
218 | * |
218 | * |
219 | * @param pt Level 1 page table. |
219 | * @param pt Level 1 page table. |
220 | * @param i Index of the entry to return. |
220 | * @param i Index of the entry to return. |
221 | */ |
221 | */ |
222 | static inline int get_pt_level1_flags(pte_level1_t *pt, size_t i) |
222 | static inline int get_pt_level1_flags(pte_level1_t *pt, size_t i) |
223 | { |
223 | { |
224 | pte_level1_t *p = &pt[i]; |
224 | pte_level1_t *p = &pt[i]; |
225 | 225 | ||
226 | int dt = p->descriptor_type; |
226 | int dt = p->descriptor_type; |
227 | int ap = p->access_permission_0; |
227 | int ap = p->access_permission_0; |
228 | 228 | ||
229 | return ((dt == PTE_DESCRIPTOR_NOT_PRESENT) << PAGE_PRESENT_SHIFT) | |
229 | return ((dt == PTE_DESCRIPTOR_NOT_PRESENT) << PAGE_PRESENT_SHIFT) | |
230 | ((ap == PTE_AP_USER_RO_KERNEL_RW) << PAGE_READ_SHIFT) | |
230 | ((ap == PTE_AP_USER_RO_KERNEL_RW) << PAGE_READ_SHIFT) | |
231 | ((ap == PTE_AP_USER_RW_KERNEL_RW) << PAGE_READ_SHIFT) | |
231 | ((ap == PTE_AP_USER_RW_KERNEL_RW) << PAGE_READ_SHIFT) | |
232 | ((ap == PTE_AP_USER_RW_KERNEL_RW) << PAGE_WRITE_SHIFT) | |
232 | ((ap == PTE_AP_USER_RW_KERNEL_RW) << PAGE_WRITE_SHIFT) | |
233 | ((ap != PTE_AP_USER_NO_KERNEL_RW) << PAGE_USER_SHIFT) | |
233 | ((ap != PTE_AP_USER_NO_KERNEL_RW) << PAGE_USER_SHIFT) | |
234 | ((ap == PTE_AP_USER_NO_KERNEL_RW) << PAGE_READ_SHIFT) | |
234 | ((ap == PTE_AP_USER_NO_KERNEL_RW) << PAGE_READ_SHIFT) | |
235 | ((ap == PTE_AP_USER_NO_KERNEL_RW) << PAGE_WRITE_SHIFT) | |
235 | ((ap == PTE_AP_USER_NO_KERNEL_RW) << PAGE_WRITE_SHIFT) | |
236 | (1 << PAGE_EXEC_SHIFT) | |
236 | (1 << PAGE_EXEC_SHIFT) | |
237 | (p->bufferable << PAGE_CACHEABLE); |
237 | (p->bufferable << PAGE_CACHEABLE); |
238 | } |
238 | } |
239 | 239 | ||
240 | 240 | ||
241 | /** Sets flags of level 0 page table entry. |
241 | /** Sets flags of level 0 page table entry. |
242 | * |
242 | * |
243 | * @param pt level 0 page table |
243 | * @param pt level 0 page table |
244 | * @param i index of the entry to be changed |
244 | * @param i index of the entry to be changed |
245 | * @param flags new flags |
245 | * @param flags new flags |
246 | */ |
246 | */ |
247 | static inline void set_pt_level0_flags(pte_level0_t *pt, size_t i, int flags) |
247 | static inline void set_pt_level0_flags(pte_level0_t *pt, size_t i, int flags) |
248 | { |
248 | { |
249 | pte_level0_t *p = &pt[i]; |
249 | pte_level0_t *p = &pt[i]; |
250 | 250 | ||
251 | if (flags & PAGE_NOT_PRESENT) { |
251 | if (flags & PAGE_NOT_PRESENT) { |
252 | p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT; |
252 | p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT; |
253 | /* |
253 | /* |
254 | * Ensures that the entry will be recognized as valid when |
254 | * Ensures that the entry will be recognized as valid when |
255 | * PTE_VALID_ARCH applied. |
255 | * PTE_VALID_ARCH applied. |
256 | */ |
256 | */ |
257 | p->should_be_zero = 1; |
257 | p->should_be_zero = 1; |
258 | } else { |
258 | } else { |
259 | p->descriptor_type = PTE_DESCRIPTOR_COARSE_TABLE; |
259 | p->descriptor_type = PTE_DESCRIPTOR_COARSE_TABLE; |
260 | p->should_be_zero = 0; |
260 | p->should_be_zero = 0; |
261 | } |
261 | } |
262 | } |
262 | } |
263 | 263 | ||
264 | 264 | ||
265 | /** Sets flags of level 1 page table entry. |
265 | /** Sets flags of level 1 page table entry. |
266 | * |
266 | * |
267 | * We use same access rights for the whole page. When page is not preset we |
267 | * We use same access rights for the whole page. When page is not preset we |
268 | * store 1 in acess_rigts_3 so that at least one bit is 1 (to mark correct |
268 | * store 1 in acess_rigts_3 so that at least one bit is 1 (to mark correct |
269 | * page entry, see #PAGE_VALID_ARCH). |
269 | * page entry, see #PAGE_VALID_ARCH). |
270 | * |
270 | * |
271 | * @param pt Level 1 page table. |
271 | * @param pt Level 1 page table. |
272 | * @param i Index of the entry to be changed. |
272 | * @param i Index of the entry to be changed. |
273 | * @param flags New flags. |
273 | * @param flags New flags. |
274 | */ |
274 | */ |
275 | static inline void set_pt_level1_flags(pte_level1_t *pt, size_t i, int flags) |
275 | static inline void set_pt_level1_flags(pte_level1_t *pt, size_t i, int flags) |
276 | { |
276 | { |
277 | pte_level1_t *p = &pt[i]; |
277 | pte_level1_t *p = &pt[i]; |
278 | 278 | ||
279 | if (flags & PAGE_NOT_PRESENT) { |
279 | if (flags & PAGE_NOT_PRESENT) { |
280 | p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT; |
280 | p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT; |
281 | p->access_permission_3 = 1; |
281 | p->access_permission_3 = 1; |
282 | } else { |
282 | } else { |
283 | p->descriptor_type = PTE_DESCRIPTOR_SMALL_PAGE; |
283 | p->descriptor_type = PTE_DESCRIPTOR_SMALL_PAGE; |
284 | p->access_permission_3 = p->access_permission_0; |
284 | p->access_permission_3 = p->access_permission_0; |
285 | } |
285 | } |
286 | 286 | ||
287 | p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0; |
287 | p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0; |
288 | 288 | ||
289 | /* default access permission */ |
289 | /* default access permission */ |
290 | p->access_permission_0 = p->access_permission_1 = |
290 | p->access_permission_0 = p->access_permission_1 = |
291 | p->access_permission_2 = p->access_permission_3 = |
291 | p->access_permission_2 = p->access_permission_3 = |
292 | PTE_AP_USER_NO_KERNEL_RW; |
292 | PTE_AP_USER_NO_KERNEL_RW; |
293 | 293 | ||
294 | if (flags & PAGE_USER) { |
294 | if (flags & PAGE_USER) { |
295 | if (flags & PAGE_READ) { |
295 | if (flags & PAGE_READ) { |
296 | p->access_permission_0 = p->access_permission_1 = |
296 | p->access_permission_0 = p->access_permission_1 = |
297 | p->access_permission_2 = p->access_permission_3 = |
297 | p->access_permission_2 = p->access_permission_3 = |
298 | PTE_AP_USER_RO_KERNEL_RW; |
298 | PTE_AP_USER_RO_KERNEL_RW; |
299 | } |
299 | } |
300 | if (flags & PAGE_WRITE) { |
300 | if (flags & PAGE_WRITE) { |
301 | p->access_permission_0 = p->access_permission_1 = |
301 | p->access_permission_0 = p->access_permission_1 = |
302 | p->access_permission_2 = p->access_permission_3 = |
302 | p->access_permission_2 = p->access_permission_3 = |
303 | PTE_AP_USER_RW_KERNEL_RW; |
303 | PTE_AP_USER_RW_KERNEL_RW; |
304 | } |
304 | } |
305 | } |
305 | } |
306 | } |
306 | } |
307 | 307 | ||
308 | 308 | ||
309 | extern void page_arch_init(void); |
309 | extern void page_arch_init(void); |
310 | 310 | ||
311 | 311 | ||
312 | #endif /* __ASM__ */ |
312 | #endif /* __ASM__ */ |
313 | 313 | ||
314 | #endif /* KERNEL */ |
314 | #endif /* KERNEL */ |
315 | 315 | ||
316 | #endif |
316 | #endif |
317 | 317 | ||
318 | /** @} |
318 | /** @} |
319 | */ |
319 | */ |
320 | 320 |