Rev 2410 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
2128 | jermar | 1 | /* |
2238 | kebrt | 2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
2128 | 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 | /** @addtogroup arm32mm |
||
30 | * @{ |
||
31 | */ |
||
32 | /** @file |
||
2410 | stepan | 33 | * @brief Paging related declarations. |
2128 | jermar | 34 | */ |
35 | |||
36 | #ifndef KERN_arm32_PAGE_H_ |
||
37 | #define KERN_arm32_PAGE_H_ |
||
38 | |||
39 | #include <arch/mm/frame.h> |
||
2182 | jancik | 40 | #include <mm/mm.h> |
41 | #include <arch/exception.h> |
||
2128 | jermar | 42 | |
2182 | jancik | 43 | |
2128 | jermar | 44 | #define PAGE_WIDTH FRAME_WIDTH |
45 | #define PAGE_SIZE FRAME_SIZE |
||
46 | |||
47 | #define PAGE_COLOR_BITS 0 /* dummy */ |
||
48 | |||
49 | #ifndef __ASM__ |
||
50 | # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
||
51 | # define PA2KA(x) (((uintptr_t) (x)) + 0x80000000) |
||
52 | #else |
||
53 | # define KA2PA(x) ((x) - 0x80000000) |
||
54 | # define PA2KA(x) ((x) + 0x80000000) |
||
55 | #endif |
||
56 | |||
57 | #ifdef KERNEL |
||
58 | |||
2276 | jancik | 59 | #define PTL0_ENTRIES_ARCH (2<<12) // 4096 |
60 | #define PTL1_ENTRIES_ARCH 0 |
||
61 | #define PTL2_ENTRIES_ARCH 0 |
||
2241 | kebrt | 62 | /* coarse page tables used (256*4 = 1KB per page) */ |
2276 | jancik | 63 | #define PTL3_ENTRIES_ARCH (2<<8) // 256 |
2128 | jermar | 64 | |
2276 | jancik | 65 | #define PTL0_SIZE_ARCH FOUR_FRAMES |
66 | #define PTL1_SIZE_ARCH 0 |
||
67 | #define PTL2_SIZE_ARCH 0 |
||
68 | #define PTL3_SIZE_ARCH ONE_FRAME |
||
2242 | kebrt | 69 | |
2276 | jancik | 70 | #define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 20) & 0xfff) |
71 | #define PTL1_INDEX_ARCH(vaddr) 0 |
||
72 | #define PTL2_INDEX_ARCH(vaddr) 0 |
||
73 | #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x0ff) |
||
2128 | jermar | 74 | |
2276 | jancik | 75 | #define GET_PTL1_ADDRESS_ARCH(ptl0, i) ((pte_t *)( (((pte_level0_t*)(ptl0))[(i)]).coarse_table_addr << 10 )) |
76 | #define GET_PTL2_ADDRESS_ARCH(ptl1, i) (ptl1) |
||
77 | #define GET_PTL3_ADDRESS_ARCH(ptl2, i) (ptl2) |
||
78 | #define GET_FRAME_ADDRESS_ARCH(ptl3, i) ((uintptr_t)( (((pte_level1_t*)(ptl3))[(i)]).frame_base_addr << 12 )) |
||
2128 | jermar | 79 | |
2276 | jancik | 80 | #define SET_PTL0_ADDRESS_ARCH(ptl0) (set_ptl0_addr((pte_level0_t *)(ptl0))) |
81 | #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) (((pte_level0_t *)(ptl0))[(i)].coarse_table_addr = (a)>>10) |
||
2147 | jancik | 82 | #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
83 | #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
||
2276 | jancik | 84 | #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) (((pte_level1_t *)(ptl3))[(i)].frame_base_addr = (a)>>12) |
2128 | jermar | 85 | |
2276 | jancik | 86 | #define GET_PTL1_FLAGS_ARCH(ptl0, i) get_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i)) |
87 | #define GET_PTL2_FLAGS_ARCH(ptl1, i) PAGE_PRESENT |
||
88 | #define GET_PTL3_FLAGS_ARCH(ptl2, i) PAGE_PRESENT |
||
89 | #define GET_FRAME_FLAGS_ARCH(ptl3, i) get_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i)) |
||
2128 | jermar | 90 | |
2276 | jancik | 91 | #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) set_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i), (x)) |
2147 | jancik | 92 | #define SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
93 | #define SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
||
2276 | jancik | 94 | #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) set_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i), (x)) |
2128 | jermar | 95 | |
2276 | jancik | 96 | #define PTE_VALID_ARCH(pte) (*((uint32_t *) (pte)) != 0) |
97 | #define PTE_PRESENT_ARCH(pte) ( ((pte_level0_t *)(pte))->descriptor_type != 0 ) |
||
2241 | kebrt | 98 | |
99 | /* pte should point into ptl3 */ |
||
2276 | jancik | 100 | #define PTE_GET_FRAME_ARCH(pte) ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH) |
2241 | kebrt | 101 | /* pte should point into ptl3 */ |
2276 | jancik | 102 | #define PTE_WRITABLE_ARCH(pte) ( ((pte_level1_t *)(pte))->access_permission_0 == PTE_AP_USER_RW_KERNEL_RW ) |
103 | #define PTE_EXECUTABLE_ARCH(pte) 1 |
||
2241 | kebrt | 104 | |
2329 | kebrt | 105 | |
2128 | jermar | 106 | #ifndef __ASM__ |
107 | |||
2276 | jancik | 108 | /** Level 0 page table entry. */ |
109 | typedef struct { |
||
2411 | stepan | 110 | |
2276 | jancik | 111 | /* 01b for coarse tables, see below for details */ |
112 | unsigned descriptor_type : 2; |
||
113 | unsigned impl_specific : 3; |
||
114 | unsigned domain : 4; |
||
115 | unsigned should_be_zero : 1; |
||
2411 | stepan | 116 | |
2276 | jancik | 117 | /* Pointer to the coarse 2nd level page table (holding entries for small (4KB) |
118 | * or large (64KB) pages. ARM also supports fine 2nd level page tables that |
||
119 | * may hold even tiny pages (1KB) but they are bigger (4KB per table in comparison |
||
120 | * with 1KB per the coarse table) |
||
121 | */ |
||
122 | unsigned coarse_table_addr : 22; |
||
123 | } __attribute__ ((packed)) pte_level0_t; |
||
124 | |||
2329 | kebrt | 125 | |
126 | /** Level 1 page table entry (small (4KB) pages used). */ |
||
2276 | jancik | 127 | typedef struct { |
2411 | stepan | 128 | |
2276 | jancik | 129 | /* 0b10 for small pages */ |
130 | unsigned descriptor_type : 2; |
||
131 | unsigned bufferable : 1; |
||
132 | unsigned cacheable : 1; |
||
2411 | stepan | 133 | |
2276 | jancik | 134 | /* access permissions for each of 4 subparts of a page |
135 | * (for each 1KB when small pages used */ |
||
136 | unsigned access_permission_0 : 2; |
||
137 | unsigned access_permission_1 : 2; |
||
138 | unsigned access_permission_2 : 2; |
||
139 | unsigned access_permission_3 : 2; |
||
140 | unsigned frame_base_addr : 20; |
||
141 | } __attribute__ ((packed)) pte_level1_t; |
||
142 | |||
143 | |||
144 | /* Level 1 page tables access permissions */ |
||
145 | |||
2329 | kebrt | 146 | /** User mode: no access, privileged mode: no access. */ |
2276 | jancik | 147 | #define PTE_AP_USER_NO_KERNEL_NO 0 |
2411 | stepan | 148 | |
2329 | kebrt | 149 | /** User mode: no access, privileged mode: read/write. */ |
2276 | jancik | 150 | #define PTE_AP_USER_NO_KERNEL_RW 1 |
2411 | stepan | 151 | |
2329 | kebrt | 152 | /** User mode: read only, privileged mode: read/write. */ |
2276 | jancik | 153 | #define PTE_AP_USER_RO_KERNEL_RW 2 |
2411 | stepan | 154 | |
2329 | kebrt | 155 | /** User mode: read/write, privileged mode: read/write. */ |
2276 | jancik | 156 | #define PTE_AP_USER_RW_KERNEL_RW 3 |
157 | |||
158 | |||
159 | /* pte_level0_t and pte_level1_t descriptor_type flags */ |
||
160 | |||
2329 | kebrt | 161 | /** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type). */ |
2276 | jancik | 162 | #define PTE_DESCRIPTOR_NOT_PRESENT 0 |
2411 | stepan | 163 | |
2329 | kebrt | 164 | /** pte_level0_t coarse page table flag (used in descriptor_type). */ |
2276 | jancik | 165 | #define PTE_DESCRIPTOR_COARSE_TABLE 1 |
2411 | stepan | 166 | |
2329 | kebrt | 167 | /** pte_level1_t small page table flag (used in descriptor type). */ |
2276 | jancik | 168 | #define PTE_DESCRIPTOR_SMALL_PAGE 2 |
169 | |||
170 | |||
2329 | kebrt | 171 | /** Sets the address of level 0 page table. |
2241 | kebrt | 172 | * |
2329 | kebrt | 173 | * @param pt Pointer to the page table to set. |
2182 | jancik | 174 | */ |
2238 | kebrt | 175 | static inline void set_ptl0_addr( pte_level0_t* pt) |
176 | { |
||
2276 | jancik | 177 | asm volatile ( |
178 | "mcr p15, 0, %0, c2, c0, 0 \n" |
||
179 | : |
||
180 | : "r"(pt) |
||
181 | ); |
||
2182 | jancik | 182 | } |
2128 | jermar | 183 | |
2329 | kebrt | 184 | |
2263 | kebrt | 185 | /** Returns level 0 page table entry flags. |
2241 | kebrt | 186 | * |
2329 | kebrt | 187 | * @param pt Level 0 page table. |
188 | * @param i Index of the entry to return. |
||
2241 | kebrt | 189 | */ |
2147 | jancik | 190 | static inline int get_pt_level0_flags(pte_level0_t *pt, index_t i) |
2128 | jermar | 191 | { |
2238 | kebrt | 192 | pte_level0_t *p = &pt[i]; |
2147 | jancik | 193 | |
2256 | kebrt | 194 | return |
195 | ( (p->descriptor_type == PTE_DESCRIPTOR_NOT_PRESENT) << PAGE_PRESENT_SHIFT ) | |
||
2241 | kebrt | 196 | ( 1 << PAGE_USER_SHIFT ) | |
197 | ( 1 << PAGE_READ_SHIFT ) | |
||
198 | ( 1 << PAGE_WRITE_SHIFT ) | |
||
199 | ( 1 << PAGE_EXEC_SHIFT ) | |
||
200 | ( 1 << PAGE_CACHEABLE_SHIFT ) |
||
2256 | kebrt | 201 | ; |
2238 | kebrt | 202 | } |
2147 | jancik | 203 | |
2329 | kebrt | 204 | |
2263 | kebrt | 205 | /** Returns level 1 page table entry flags. |
2241 | kebrt | 206 | * |
2329 | kebrt | 207 | * @param pt Level 1 page table. |
208 | * @param i Index of the entry to return. |
||
2241 | kebrt | 209 | */ |
2149 | jancik | 210 | static inline int get_pt_level1_flags(pte_level1_t *pt, index_t i) |
2147 | jancik | 211 | { |
2241 | kebrt | 212 | pte_level1_t *p = &pt[i]; |
2128 | jermar | 213 | |
2256 | kebrt | 214 | return |
215 | ( (p->descriptor_type == PTE_DESCRIPTOR_NOT_PRESENT) << PAGE_PRESENT_SHIFT) | |
||
216 | ( (p->access_permission_0 == PTE_AP_USER_RO_KERNEL_RW) << PAGE_READ_SHIFT ) | |
||
217 | ( (p->access_permission_0 == PTE_AP_USER_RW_KERNEL_RW) << PAGE_READ_SHIFT ) | |
||
218 | ( (p->access_permission_0 == PTE_AP_USER_RW_KERNEL_RW) << PAGE_WRITE_SHIFT ) | |
||
2259 | jancik | 219 | ( (p->access_permission_0 != PTE_AP_USER_NO_KERNEL_RW) << PAGE_USER_SHIFT ) | |
220 | ( (p->access_permission_0 == PTE_AP_USER_NO_KERNEL_RW) << PAGE_READ_SHIFT ) | |
||
221 | ( (p->access_permission_0 == PTE_AP_USER_NO_KERNEL_RW) << PAGE_WRITE_SHIFT ) | |
||
2147 | jancik | 222 | ( 1 << PAGE_EXEC_SHIFT ) | |
2241 | kebrt | 223 | ( p->bufferable << PAGE_CACHEABLE ) |
2256 | kebrt | 224 | ; |
2147 | jancik | 225 | } |
226 | |||
2329 | kebrt | 227 | |
2263 | kebrt | 228 | /** Sets flags of level 0 page table entry. |
2241 | kebrt | 229 | * |
2329 | kebrt | 230 | * @param pt level 0 page table |
231 | * @param i index of the entry to be changed |
||
232 | * @param flags new flags |
||
2241 | kebrt | 233 | */ |
2147 | jancik | 234 | static inline void set_pt_level0_flags(pte_level0_t *pt, index_t i, int flags) |
2128 | jermar | 235 | { |
2147 | jancik | 236 | pte_level0_t *p = &pt[i]; |
2256 | kebrt | 237 | |
2241 | kebrt | 238 | if (flags & PAGE_NOT_PRESENT) { |
2256 | kebrt | 239 | p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT; |
2263 | kebrt | 240 | // ensures that the entry will be recognized as valid when PTE_VALID_ARCH applied |
2259 | jancik | 241 | p->should_be_zero = 1; |
2238 | kebrt | 242 | } else { |
2256 | kebrt | 243 | p->descriptor_type = PTE_DESCRIPTOR_COARSE_TABLE; |
2259 | jancik | 244 | p->should_be_zero = 0; |
2147 | jancik | 245 | } |
2128 | jermar | 246 | } |
247 | |||
2329 | kebrt | 248 | |
2263 | kebrt | 249 | /** Sets flags of level 1 page table entry. |
2241 | kebrt | 250 | * |
2263 | kebrt | 251 | * We use same access rights for the whole page. When page is not preset we |
252 | * store 1 in acess_rigts_3 so that at least one bit is 1 (to mark correct |
||
253 | * page entry, see #PAGE_VALID_ARCH). |
||
2241 | kebrt | 254 | * |
2329 | kebrt | 255 | * @param pt Level 1 page table. |
256 | * @param i Index of the entry to be changed. |
||
257 | * @param flags New flags. |
||
2147 | jancik | 258 | */ |
259 | static inline void set_pt_level1_flags(pte_level1_t *pt, index_t i, int flags) |
||
260 | { |
||
261 | pte_level1_t *p = &pt[i]; |
||
262 | |||
2241 | kebrt | 263 | if (flags & PAGE_NOT_PRESENT) { |
2256 | kebrt | 264 | p->descriptor_type = PTE_DESCRIPTOR_NOT_PRESENT; |
2259 | jancik | 265 | p->access_permission_3 = 1; |
2238 | kebrt | 266 | } else { |
2256 | kebrt | 267 | p->descriptor_type = PTE_DESCRIPTOR_SMALL_PAGE; |
2259 | jancik | 268 | p->access_permission_3 = p->access_permission_0; |
2238 | kebrt | 269 | } |
2147 | jancik | 270 | |
2238 | kebrt | 271 | p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0; |
272 | |||
2241 | kebrt | 273 | /* default access permission */ |
2238 | kebrt | 274 | p->access_permission_0 = p->access_permission_1 = |
2256 | kebrt | 275 | p->access_permission_2 = p->access_permission_3 = PTE_AP_USER_NO_KERNEL_RW; |
2238 | kebrt | 276 | |
2241 | kebrt | 277 | if (flags & PAGE_USER) { |
278 | if (flags & PAGE_READ) { |
||
2238 | kebrt | 279 | p->access_permission_0 = p->access_permission_1 = |
280 | p->access_permission_2 = p->access_permission_3 = |
||
2256 | kebrt | 281 | PTE_AP_USER_RO_KERNEL_RW; |
2238 | kebrt | 282 | } |
2241 | kebrt | 283 | if (flags & PAGE_WRITE) { |
2238 | kebrt | 284 | p->access_permission_0 = p->access_permission_1 = |
285 | p->access_permission_2 = p->access_permission_3 = |
||
2256 | kebrt | 286 | PTE_AP_USER_RW_KERNEL_RW; |
2238 | kebrt | 287 | } |
288 | } |
||
2147 | jancik | 289 | } |
290 | |||
2258 | jancik | 291 | |
2128 | jermar | 292 | extern void page_arch_init(void); |
293 | |||
2258 | jancik | 294 | |
2128 | jermar | 295 | #endif /* __ASM__ */ |
296 | |||
297 | #endif /* KERNEL */ |
||
298 | |||
299 | #endif |
||
300 | |||
301 | /** @} |
||
302 | */ |
||
2147 | jancik | 303 |