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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2001-2005 Jakub Jermar |
2 | * Copyright (C) 2001-2005 Jakub Jermar |
| 3 | * Copyright (C) 2005 Sergey Bondari |
3 | * Copyright (C) 2005 Sergey Bondari |
| 4 | * All rights reserved. |
4 | * All rights reserved. |
| 5 | * |
5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
8 | * are met: |
| 9 | * |
9 | * |
| 10 | * - Redistributions of source code must retain the above copyright |
10 | * - Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * - Redistributions in binary form must reproduce the above copyright |
12 | * - Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
14 | * documentation and/or other materials provided with the distribution. |
| 15 | * - The name of the author may not be used to endorse or promote products |
15 | * - The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
16 | * derived from this software without specific prior written permission. |
| 17 | * |
17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
28 | */ |
| 29 | 29 | ||
| 30 | /* |
30 | /* |
| 31 | * Locking order |
31 | * Locking order |
| 32 | * |
32 | * |
| 33 | * In order to access particular zone, the process must first lock |
33 | * In order to access particular zone, the process must first lock |
| 34 | * the zones.lock, then lock the zone and then unlock the zones.lock. |
34 | * the zones.lock, then lock the zone and then unlock the zones.lock. |
| 35 | * This insures, that we can fiddle with the zones in runtime without |
35 | * This insures, that we can fiddle with the zones in runtime without |
| 36 | * affecting the processes. |
36 | * affecting the processes. |
| 37 | * |
37 | * |
| 38 | */ |
38 | */ |
| 39 | 39 | ||
| 40 | #include <typedefs.h> |
40 | #include <typedefs.h> |
| 41 | #include <arch/types.h> |
41 | #include <arch/types.h> |
| 42 | #include <mm/frame.h> |
42 | #include <mm/frame.h> |
| 43 | #include <mm/as.h> |
43 | #include <mm/as.h> |
| 44 | #include <panic.h> |
44 | #include <panic.h> |
| 45 | #include <debug.h> |
45 | #include <debug.h> |
| 46 | #include <adt/list.h> |
46 | #include <adt/list.h> |
| 47 | #include <synch/spinlock.h> |
47 | #include <synch/spinlock.h> |
| 48 | #include <arch/asm.h> |
48 | #include <arch/asm.h> |
| 49 | #include <arch.h> |
49 | #include <arch.h> |
| 50 | #include <print.h> |
50 | #include <print.h> |
| 51 | #include <align.h> |
51 | #include <align.h> |
| 52 | #include <mm/slab.h> |
52 | #include <mm/slab.h> |
| 53 | #include <bitops.h> |
53 | #include <bitops.h> |
| 54 | 54 | ||
| 55 | typedef struct { |
55 | typedef struct { |
| 56 | count_t refcount; /**< tracking of shared frames */ |
56 | count_t refcount; /**< tracking of shared frames */ |
| 57 | __u8 buddy_order; /**< buddy system block order */ |
57 | __u8 buddy_order; /**< buddy system block order */ |
| 58 | link_t buddy_link; /**< link to the next free block inside one order */ |
58 | link_t buddy_link; /**< link to the next free block inside one order */ |
| 59 | void *parent; /**< If allocated by slab, this points there */ |
59 | void *parent; /**< If allocated by slab, this points there */ |
| 60 | }frame_t; |
60 | }frame_t; |
| 61 | 61 | ||
| 62 | typedef struct { |
62 | typedef struct { |
| 63 | SPINLOCK_DECLARE(lock); /**< this lock protects everything below */ |
63 | SPINLOCK_DECLARE(lock); /**< this lock protects everything below */ |
| 64 | pfn_t base; /**< frame_no of the first frame in the frames array */ |
64 | pfn_t base; /**< frame_no of the first frame in the frames array */ |
| 65 | count_t count; /**< Size of zone */ |
65 | count_t count; /**< Size of zone */ |
| 66 | 66 | ||
| 67 | frame_t *frames; /**< array of frame_t structures in this zone */ |
67 | frame_t *frames; /**< array of frame_t structures in this zone */ |
| 68 | count_t free_count; /**< number of free frame_t structures */ |
68 | count_t free_count; /**< number of free frame_t structures */ |
| 69 | count_t busy_count; /**< number of busy frame_t structures */ |
69 | count_t busy_count; /**< number of busy frame_t structures */ |
| 70 | 70 | ||
| 71 | buddy_system_t * buddy_system; /**< buddy system for the zone */ |
71 | buddy_system_t * buddy_system; /**< buddy system for the zone */ |
| 72 | int flags; |
72 | int flags; |
| 73 | }zone_t; |
73 | }zone_t; |
| 74 | 74 | ||
| 75 | /* |
75 | /* |
| 76 | * The zoneinfo.lock must be locked when accessing zoneinfo structure. |
76 | * The zoneinfo.lock must be locked when accessing zoneinfo structure. |
| 77 | * Some of the attributes in zone_t structures are 'read-only' |
77 | * Some of the attributes in zone_t structures are 'read-only' |
| 78 | */ |
78 | */ |
| 79 | 79 | ||
| 80 | struct { |
80 | struct { |
| 81 | SPINLOCK_DECLARE(lock); |
81 | SPINLOCK_DECLARE(lock); |
| 82 | int count; |
82 | int count; |
| 83 | zone_t *info[ZONES_MAX]; |
83 | zone_t *info[ZONES_MAX]; |
| 84 | }zones; |
84 | }zones; |
| 85 | 85 | ||
| 86 | 86 | ||
| 87 | /*********************************/ |
87 | /*********************************/ |
| 88 | /* Helper functions */ |
88 | /* Helper functions */ |
| 89 | static inline index_t frame_index(zone_t *zone, frame_t *frame) |
89 | static inline index_t frame_index(zone_t *zone, frame_t *frame) |
| 90 | { |
90 | { |
| 91 | return (index_t)(frame - zone->frames); |
91 | return (index_t)(frame - zone->frames); |
| 92 | } |
92 | } |
| 93 | static inline index_t frame_index_abs(zone_t *zone, frame_t *frame) |
93 | static inline index_t frame_index_abs(zone_t *zone, frame_t *frame) |
| 94 | { |
94 | { |
| 95 | return (index_t)(frame - zone->frames) + zone->base; |
95 | return (index_t)(frame - zone->frames) + zone->base; |
| 96 | } |
96 | } |
| 97 | static inline int frame_index_valid(zone_t *zone, index_t index) |
97 | static inline int frame_index_valid(zone_t *zone, index_t index) |
| 98 | { |
98 | { |
| 99 | return index >= 0 && index < zone->count; |
99 | return index >= 0 && index < zone->count; |
| 100 | } |
100 | } |
| 101 | 101 | ||
| 102 | /** Compute pfn_t from frame_t pointer & zone pointer */ |
102 | /** Compute pfn_t from frame_t pointer & zone pointer */ |
| 103 | static index_t make_frame_index(zone_t *zone, frame_t *frame) |
103 | static index_t make_frame_index(zone_t *zone, frame_t *frame) |
| 104 | { |
104 | { |
| 105 | return frame - zone->frames; |
105 | return frame - zone->frames; |
| 106 | } |
106 | } |
| 107 | 107 | ||
| 108 | /** Initialize frame structure |
108 | /** Initialize frame structure |
| 109 | * |
109 | * |
| 110 | * Initialize frame structure. |
110 | * Initialize frame structure. |
| 111 | * |
111 | * |
| 112 | * @param frame Frame structure to be initialized. |
112 | * @param frame Frame structure to be initialized. |
| 113 | */ |
113 | */ |
| 114 | static void frame_initialize(frame_t *frame) |
114 | static void frame_initialize(frame_t *frame) |
| 115 | { |
115 | { |
| 116 | frame->refcount = 1; |
116 | frame->refcount = 1; |
| 117 | frame->buddy_order = 0; |
117 | frame->buddy_order = 0; |
| 118 | } |
118 | } |
| 119 | 119 | ||
| 120 | /*************************************/ |
120 | /*************************************/ |
| 121 | /* Zoneinfo functions */ |
121 | /* Zoneinfo functions */ |
| 122 | 122 | ||
| 123 | /** |
123 | /** |
| 124 | * Insert-sort zone into zones list |
124 | * Insert-sort zone into zones list |
| 125 | * |
125 | * |
| 126 | * @return zone number on success, -1 on error |
126 | * @return zone number on success, -1 on error |
| 127 | */ |
127 | */ |
| 128 | static int zones_add_zone(zone_t *newzone) |
128 | static int zones_add_zone(zone_t *newzone) |
| 129 | { |
129 | { |
| 130 | int i,j; |
130 | int i,j; |
| 131 | ipl_t ipl; |
131 | ipl_t ipl; |
| 132 | zone_t *z; |
132 | zone_t *z; |
| 133 | 133 | ||
| 134 | ipl = interrupts_disable(); |
134 | ipl = interrupts_disable(); |
| 135 | spinlock_lock(&zones.lock); |
135 | spinlock_lock(&zones.lock); |
| 136 | /* Try to merge */ |
136 | /* Try to merge */ |
| 137 | if (zones.count+1 == ZONES_MAX) |
137 | if (zones.count+1 == ZONES_MAX) |
| 138 | panic("Maximum zone(%d) count exceeded.", ZONES_MAX); |
138 | panic("Maximum zone(%d) count exceeded.", ZONES_MAX); |
| 139 | for (i=0; i < zones.count; i++) { |
139 | for (i=0; i < zones.count; i++) { |
| 140 | /* Check for overflow */ |
140 | /* Check for overflow */ |
| 141 | z = zones.info[i]; |
141 | z = zones.info[i]; |
| 142 | if (overlaps(newzone->base,newzone->count, |
142 | if (overlaps(newzone->base,newzone->count, |
| 143 | z->base, z->count)) { |
143 | z->base, z->count)) { |
| 144 | printf("Zones overlap!\n"); |
144 | printf("Zones overlap!\n"); |
| 145 | return -1; |
145 | return -1; |
| 146 | } |
146 | } |
| 147 | if (newzone->base < z->base) |
147 | if (newzone->base < z->base) |
| 148 | break; |
148 | break; |
| 149 | } |
149 | } |
| 150 | /* Move other zones up */ |
150 | /* Move other zones up */ |
| 151 | for (j=i;j < zones.count;j++) |
151 | for (j=i;j < zones.count;j++) |
| 152 | zones.info[j+1] = zones.info[j]; |
152 | zones.info[j+1] = zones.info[j]; |
| 153 | zones.info[i] = newzone; |
153 | zones.info[i] = newzone; |
| 154 | zones.count++; |
154 | zones.count++; |
| 155 | spinlock_unlock(&zones.lock); |
155 | spinlock_unlock(&zones.lock); |
| 156 | interrupts_restore(ipl); |
156 | interrupts_restore(ipl); |
| 157 | 157 | ||
| 158 | return i; |
158 | return i; |
| 159 | } |
159 | } |
| 160 | 160 | ||
| 161 | /** |
161 | /** |
| 162 | * Try to find a zone where can we find the frame |
162 | * Try to find a zone where can we find the frame |
| 163 | * |
163 | * |
| 164 | * @param hint Start searching in zone 'hint' |
164 | * @param hint Start searching in zone 'hint' |
| 165 | * @param lock Lock zone if true |
165 | * @param lock Lock zone if true |
| 166 | * |
166 | * |
| 167 | * Assume interrupts disable |
167 | * Assume interrupts disable |
| 168 | */ |
168 | */ |
| 169 | static zone_t * find_zone_and_lock(pfn_t frame, int *pzone) |
169 | static zone_t * find_zone_and_lock(pfn_t frame, int *pzone) |
| 170 | { |
170 | { |
| 171 | int i; |
171 | int i; |
| 172 | int hint = pzone ? *pzone : 0; |
172 | int hint = pzone ? *pzone : 0; |
| 173 | zone_t *z; |
173 | zone_t *z; |
| 174 | 174 | ||
| 175 | spinlock_lock(&zones.lock); |
175 | spinlock_lock(&zones.lock); |
| 176 | 176 | ||
| 177 | if (hint >= zones.count || hint < 0) |
177 | if (hint >= zones.count || hint < 0) |
| 178 | hint = 0; |
178 | hint = 0; |
| 179 | 179 | ||
| 180 | i = hint; |
180 | i = hint; |
| 181 | do { |
181 | do { |
| 182 | z = zones.info[i]; |
182 | z = zones.info[i]; |
| 183 | spinlock_lock(&z->lock); |
183 | spinlock_lock(&z->lock); |
| 184 | if (z->base <= frame && z->base + z->count > frame) { |
184 | if (z->base <= frame && z->base + z->count > frame) { |
| 185 | spinlock_unlock(&zones.lock); /* Unlock the global lock */ |
185 | spinlock_unlock(&zones.lock); /* Unlock the global lock */ |
| 186 | if (pzone) |
186 | if (pzone) |
| 187 | *pzone = i; |
187 | *pzone = i; |
| 188 | return z; |
188 | return z; |
| 189 | } |
189 | } |
| 190 | spinlock_unlock(&z->lock); |
190 | spinlock_unlock(&z->lock); |
| 191 | 191 | ||
| 192 | i++; |
192 | i++; |
| 193 | if (i >= zones.count) |
193 | if (i >= zones.count) |
| 194 | i = 0; |
194 | i = 0; |
| 195 | } while(i != hint); |
195 | } while(i != hint); |
| 196 | 196 | ||
| 197 | spinlock_unlock(&zones.lock); |
197 | spinlock_unlock(&zones.lock); |
| 198 | return NULL; |
198 | return NULL; |
| 199 | } |
199 | } |
| 200 | 200 | ||
| 201 | /** @return True if zone can allocate specified order */ |
201 | /** @return True if zone can allocate specified order */ |
| 202 | static int zone_can_alloc(zone_t *z, __u8 order) |
202 | static int zone_can_alloc(zone_t *z, __u8 order) |
| 203 | { |
203 | { |
| 204 | return buddy_system_can_alloc(z->buddy_system, order); |
204 | return buddy_system_can_alloc(z->buddy_system, order); |
| 205 | } |
205 | } |
| 206 | 206 | ||
| 207 | /** |
207 | /** |
| 208 | * Find AND LOCK zone that can allocate order frames |
208 | * Find AND LOCK zone that can allocate order frames |
| 209 | * |
209 | * |
| 210 | * Assume interrupts are disabled!! |
210 | * Assume interrupts are disabled!! |
| 211 | * |
211 | * |
| 212 | * @param pzone Pointer to preferred zone or NULL, on return contains zone number |
212 | * @param pzone Pointer to preferred zone or NULL, on return contains zone number |
| 213 | */ |
213 | */ |
| 214 | static zone_t * find_free_zone_lock(__u8 order, int *pzone) |
214 | static zone_t * find_free_zone_lock(__u8 order, int *pzone) |
| 215 | { |
215 | { |
| 216 | int i; |
216 | int i; |
| 217 | zone_t *z; |
217 | zone_t *z; |
| 218 | int hint = pzone ? *pzone : 0; |
218 | int hint = pzone ? *pzone : 0; |
| 219 | 219 | ||
| 220 | spinlock_lock(&zones.lock); |
220 | spinlock_lock(&zones.lock); |
| 221 | if (hint >= zones.count) |
221 | if (hint >= zones.count) |
| 222 | hint = 0; |
222 | hint = 0; |
| 223 | i = hint; |
223 | i = hint; |
| 224 | do { |
224 | do { |
| 225 | z = zones.info[i]; |
225 | z = zones.info[i]; |
| 226 | 226 | ||
| 227 | spinlock_lock(&z->lock); |
227 | spinlock_lock(&z->lock); |
| 228 | 228 | ||
| 229 | /* Check if the zone has 2^order frames area available */ |
229 | /* Check if the zone has 2^order frames area available */ |
| 230 | if (zone_can_alloc(z, order)) { |
230 | if (zone_can_alloc(z, order)) { |
| 231 | spinlock_unlock(&zones.lock); |
231 | spinlock_unlock(&zones.lock); |
| 232 | if (pzone) |
232 | if (pzone) |
| 233 | *pzone = i; |
233 | *pzone = i; |
| 234 | return z; |
234 | return z; |
| 235 | } |
235 | } |
| 236 | spinlock_unlock(&z->lock); |
236 | spinlock_unlock(&z->lock); |
| 237 | if (++i >= zones.count) |
237 | if (++i >= zones.count) |
| 238 | i = 0; |
238 | i = 0; |
| 239 | } while(i != hint); |
239 | } while(i != hint); |
| 240 | spinlock_unlock(&zones.lock); |
240 | spinlock_unlock(&zones.lock); |
| 241 | return NULL; |
241 | return NULL; |
| 242 | } |
242 | } |
| 243 | 243 | ||
| 244 | /********************************************/ |
244 | /********************************************/ |
| 245 | /* Buddy system functions */ |
245 | /* Buddy system functions */ |
| 246 | 246 | ||
| 247 | /** Buddy system find_block implementation |
247 | /** Buddy system find_block implementation |
| 248 | * |
248 | * |
| 249 | * Find block that is parent of current list. |
249 | * Find block that is parent of current list. |
| 250 | * That means go to lower addresses, until such block is found |
250 | * That means go to lower addresses, until such block is found |
| 251 | * |
251 | * |
| 252 | * @param order - Order of parent must be different then this parameter!! |
252 | * @param order - Order of parent must be different then this parameter!! |
| 253 | */ |
253 | */ |
| 254 | static link_t *zone_buddy_find_block(buddy_system_t *b, link_t *child, |
254 | static link_t *zone_buddy_find_block(buddy_system_t *b, link_t *child, |
| 255 | __u8 order) |
255 | __u8 order) |
| 256 | { |
256 | { |
| 257 | frame_t * frame; |
257 | frame_t * frame; |
| 258 | zone_t * zone; |
258 | zone_t * zone; |
| 259 | index_t index; |
259 | index_t index; |
| 260 | 260 | ||
| 261 | frame = list_get_instance(child, frame_t, buddy_link); |
261 | frame = list_get_instance(child, frame_t, buddy_link); |
| 262 | zone = (zone_t *) b->data; |
262 | zone = (zone_t *) b->data; |
| 263 | 263 | ||
| 264 | index = frame_index(zone, frame); |
264 | index = frame_index(zone, frame); |
| 265 | do { |
265 | do { |
| 266 | if (zone->frames[index].buddy_order != order) { |
266 | if (zone->frames[index].buddy_order != order) { |
| 267 | return &zone->frames[index].buddy_link; |
267 | return &zone->frames[index].buddy_link; |
| 268 | } |
268 | } |
| 269 | } while(index-- > 0); |
269 | } while(index-- > 0); |
| 270 | return NULL; |
270 | return NULL; |
| 271 | } |
271 | } |
| 272 | 272 | ||
| 273 | static void zone_buddy_print_id(buddy_system_t *b, link_t *block) |
273 | static void zone_buddy_print_id(buddy_system_t *b, link_t *block) |
| 274 | { |
274 | { |
| 275 | frame_t * frame; |
275 | frame_t * frame; |
| 276 | zone_t * zone; |
276 | zone_t * zone; |
| 277 | index_t index; |
277 | index_t index; |
| 278 | 278 | ||
| 279 | frame = list_get_instance(block, frame_t, buddy_link); |
279 | frame = list_get_instance(block, frame_t, buddy_link); |
| 280 | zone = (zone_t *) b->data; |
280 | zone = (zone_t *) b->data; |
| 281 | index = frame_index(zone, frame); |
281 | index = frame_index(zone, frame); |
| 282 | printf("%d", index); |
282 | printf("%d", index); |
| 283 | } |
283 | } |
| 284 | 284 | ||
| 285 | /** Buddy system find_buddy implementation |
285 | /** Buddy system find_buddy implementation |
| 286 | * |
286 | * |
| 287 | * @param b Buddy system. |
287 | * @param b Buddy system. |
| 288 | * @param block Block for which buddy should be found |
288 | * @param block Block for which buddy should be found |
| 289 | * |
289 | * |
| 290 | * @return Buddy for given block if found |
290 | * @return Buddy for given block if found |
| 291 | */ |
291 | */ |
| 292 | static link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * block) |
292 | static link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * block) |
| 293 | { |
293 | { |
| 294 | frame_t * frame; |
294 | frame_t * frame; |
| 295 | zone_t * zone; |
295 | zone_t * zone; |
| 296 | index_t index; |
296 | index_t index; |
| 297 | bool is_left, is_right; |
297 | bool is_left, is_right; |
| 298 | 298 | ||
| 299 | frame = list_get_instance(block, frame_t, buddy_link); |
299 | frame = list_get_instance(block, frame_t, buddy_link); |
| 300 | zone = (zone_t *) b->data; |
300 | zone = (zone_t *) b->data; |
| 301 | ASSERT(IS_BUDDY_ORDER_OK(frame_index_abs(zone, frame), frame->buddy_order)); |
301 | ASSERT(IS_BUDDY_ORDER_OK(frame_index_abs(zone, frame), frame->buddy_order)); |
| 302 | 302 | ||
| 303 | is_left = IS_BUDDY_LEFT_BLOCK_ABS(zone, frame); |
303 | is_left = IS_BUDDY_LEFT_BLOCK_ABS(zone, frame); |
| 304 | is_right = IS_BUDDY_RIGHT_BLOCK_ABS(zone, frame); |
304 | is_right = IS_BUDDY_RIGHT_BLOCK_ABS(zone, frame); |
| 305 | 305 | ||
| 306 | ASSERT(is_left ^ is_right); |
306 | ASSERT(is_left ^ is_right); |
| 307 | if (is_left) { |
307 | if (is_left) { |
| 308 | index = (frame_index(zone, frame)) + (1 << frame->buddy_order); |
308 | index = (frame_index(zone, frame)) + (1 << frame->buddy_order); |
| 309 | } else { // if (is_right) |
309 | } else { // if (is_right) |
| 310 | index = (frame_index(zone, frame)) - (1 << frame->buddy_order); |
310 | index = (frame_index(zone, frame)) - (1 << frame->buddy_order); |
| 311 | } |
311 | } |
| 312 | 312 | ||
| 313 | - | ||
| 314 | if (frame_index_valid(zone, index)) { |
313 | if (frame_index_valid(zone, index)) { |
| 315 | if (zone->frames[index].buddy_order == frame->buddy_order && |
314 | if (zone->frames[index].buddy_order == frame->buddy_order && |
| 316 | zone->frames[index].refcount == 0) { |
315 | zone->frames[index].refcount == 0) { |
| 317 | return &zone->frames[index].buddy_link; |
316 | return &zone->frames[index].buddy_link; |
| 318 | } |
317 | } |
| 319 | } |
318 | } |
| 320 | 319 | ||
| 321 | return NULL; |
320 | return NULL; |
| 322 | } |
321 | } |
| 323 | 322 | ||
| 324 | /** Buddy system bisect implementation |
323 | /** Buddy system bisect implementation |
| 325 | * |
324 | * |
| 326 | * @param b Buddy system. |
325 | * @param b Buddy system. |
| 327 | * @param block Block to bisect |
326 | * @param block Block to bisect |
| 328 | * |
327 | * |
| 329 | * @return right block |
328 | * @return right block |
| 330 | */ |
329 | */ |
| 331 | static link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block) { |
330 | static link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block) { |
| 332 | frame_t * frame_l, * frame_r; |
331 | frame_t * frame_l, * frame_r; |
| 333 | 332 | ||
| 334 | frame_l = list_get_instance(block, frame_t, buddy_link); |
333 | frame_l = list_get_instance(block, frame_t, buddy_link); |
| 335 | frame_r = (frame_l + (1 << (frame_l->buddy_order - 1))); |
334 | frame_r = (frame_l + (1 << (frame_l->buddy_order - 1))); |
| 336 | 335 | ||
| 337 | return &frame_r->buddy_link; |
336 | return &frame_r->buddy_link; |
| 338 | } |
337 | } |
| 339 | 338 | ||
| 340 | /** Buddy system coalesce implementation |
339 | /** Buddy system coalesce implementation |
| 341 | * |
340 | * |
| 342 | * @param b Buddy system. |
341 | * @param b Buddy system. |
| 343 | * @param block_1 First block |
342 | * @param block_1 First block |
| 344 | * @param block_2 First block's buddy |
343 | * @param block_2 First block's buddy |
| 345 | * |
344 | * |
| 346 | * @return Coalesced block (actually block that represents lower address) |
345 | * @return Coalesced block (actually block that represents lower address) |
| 347 | */ |
346 | */ |
| 348 | static link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * block_1, |
347 | static link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * block_1, |
| 349 | link_t * block_2) |
348 | link_t * block_2) |
| 350 | { |
349 | { |
| 351 | frame_t *frame1, *frame2; |
350 | frame_t *frame1, *frame2; |
| 352 | 351 | ||
| 353 | frame1 = list_get_instance(block_1, frame_t, buddy_link); |
352 | frame1 = list_get_instance(block_1, frame_t, buddy_link); |
| 354 | frame2 = list_get_instance(block_2, frame_t, buddy_link); |
353 | frame2 = list_get_instance(block_2, frame_t, buddy_link); |
| 355 | 354 | ||
| 356 | return frame1 < frame2 ? block_1 : block_2; |
355 | return frame1 < frame2 ? block_1 : block_2; |
| 357 | } |
356 | } |
| 358 | 357 | ||
| 359 | /** Buddy system set_order implementation |
358 | /** Buddy system set_order implementation |
| 360 | * |
359 | * |
| 361 | * @param b Buddy system. |
360 | * @param b Buddy system. |
| 362 | * @param block Buddy system block |
361 | * @param block Buddy system block |
| 363 | * @param order Order to set |
362 | * @param order Order to set |
| 364 | */ |
363 | */ |
| 365 | static void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order) { |
364 | static void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order) { |
| 366 | frame_t * frame; |
365 | frame_t * frame; |
| 367 | frame = list_get_instance(block, frame_t, buddy_link); |
366 | frame = list_get_instance(block, frame_t, buddy_link); |
| 368 | frame->buddy_order = order; |
367 | frame->buddy_order = order; |
| 369 | } |
368 | } |
| 370 | 369 | ||
| 371 | /** Buddy system get_order implementation |
370 | /** Buddy system get_order implementation |
| 372 | * |
371 | * |
| 373 | * @param b Buddy system. |
372 | * @param b Buddy system. |
| 374 | * @param block Buddy system block |
373 | * @param block Buddy system block |
| 375 | * |
374 | * |
| 376 | * @return Order of block |
375 | * @return Order of block |
| 377 | */ |
376 | */ |
| 378 | static __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block) { |
377 | static __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block) { |
| 379 | frame_t * frame; |
378 | frame_t * frame; |
| 380 | frame = list_get_instance(block, frame_t, buddy_link); |
379 | frame = list_get_instance(block, frame_t, buddy_link); |
| 381 | return frame->buddy_order; |
380 | return frame->buddy_order; |
| 382 | } |
381 | } |
| 383 | 382 | ||
| 384 | /** Buddy system mark_busy implementation |
383 | /** Buddy system mark_busy implementation |
| 385 | * |
384 | * |
| 386 | * @param b Buddy system |
385 | * @param b Buddy system |
| 387 | * @param block Buddy system block |
386 | * @param block Buddy system block |
| 388 | * |
387 | * |
| 389 | */ |
388 | */ |
| 390 | static void zone_buddy_mark_busy(buddy_system_t *b, link_t * block) { |
389 | static void zone_buddy_mark_busy(buddy_system_t *b, link_t * block) { |
| 391 | frame_t * frame; |
390 | frame_t * frame; |
| 392 | 391 | ||
| 393 | frame = list_get_instance(block, frame_t, buddy_link); |
392 | frame = list_get_instance(block, frame_t, buddy_link); |
| 394 | frame->refcount = 1; |
393 | frame->refcount = 1; |
| 395 | } |
394 | } |
| 396 | 395 | ||
| 397 | /** Buddy system mark_available implementation |
396 | /** Buddy system mark_available implementation |
| 398 | * |
397 | * |
| 399 | * @param b Buddy system |
398 | * @param b Buddy system |
| 400 | * @param block Buddy system block |
399 | * @param block Buddy system block |
| 401 | * |
400 | * |
| 402 | */ |
401 | */ |
| 403 | static void zone_buddy_mark_available(buddy_system_t *b, link_t * block) { |
402 | static void zone_buddy_mark_available(buddy_system_t *b, link_t * block) { |
| 404 | frame_t * frame; |
403 | frame_t * frame; |
| 405 | frame = list_get_instance(block, frame_t, buddy_link); |
404 | frame = list_get_instance(block, frame_t, buddy_link); |
| 406 | frame->refcount = 0; |
405 | frame->refcount = 0; |
| 407 | } |
406 | } |
| 408 | 407 | ||
| 409 | static struct buddy_system_operations zone_buddy_system_operations = { |
408 | static struct buddy_system_operations zone_buddy_system_operations = { |
| 410 | .find_buddy = zone_buddy_find_buddy, |
409 | .find_buddy = zone_buddy_find_buddy, |
| 411 | .bisect = zone_buddy_bisect, |
410 | .bisect = zone_buddy_bisect, |
| 412 | .coalesce = zone_buddy_coalesce, |
411 | .coalesce = zone_buddy_coalesce, |
| 413 | .set_order = zone_buddy_set_order, |
412 | .set_order = zone_buddy_set_order, |
| 414 | .get_order = zone_buddy_get_order, |
413 | .get_order = zone_buddy_get_order, |
| 415 | .mark_busy = zone_buddy_mark_busy, |
414 | .mark_busy = zone_buddy_mark_busy, |
| 416 | .mark_available = zone_buddy_mark_available, |
415 | .mark_available = zone_buddy_mark_available, |
| 417 | .find_block = zone_buddy_find_block, |
416 | .find_block = zone_buddy_find_block, |
| 418 | .print_id = zone_buddy_print_id |
417 | .print_id = zone_buddy_print_id |
| 419 | }; |
418 | }; |
| 420 | 419 | ||
| 421 | /*************************************/ |
420 | /*************************************/ |
| 422 | /* Zone functions */ |
421 | /* Zone functions */ |
| 423 | 422 | ||
| 424 | /** Allocate frame in particular zone |
423 | /** Allocate frame in particular zone |
| 425 | * |
424 | * |
| 426 | * Assume zone is locked |
425 | * Assume zone is locked |
| 427 | * Panics, if allocation is impossible. |
426 | * Panics, if allocation is impossible. |
| 428 | * |
427 | * |
| 429 | * @return Frame index in zone |
428 | * @return Frame index in zone |
| 430 | */ |
429 | */ |
| 431 | static pfn_t zone_frame_alloc(zone_t *zone,__u8 order) |
430 | static pfn_t zone_frame_alloc(zone_t *zone,__u8 order) |
| 432 | { |
431 | { |
| 433 | pfn_t v; |
432 | pfn_t v; |
| 434 | link_t *tmp; |
433 | link_t *tmp; |
| 435 | frame_t *frame; |
434 | frame_t *frame; |
| 436 | 435 | ||
| 437 | /* Allocate frames from zone buddy system */ |
436 | /* Allocate frames from zone buddy system */ |
| 438 | tmp = buddy_system_alloc(zone->buddy_system, order); |
437 | tmp = buddy_system_alloc(zone->buddy_system, order); |
| 439 | 438 | ||
| 440 | ASSERT(tmp); |
439 | ASSERT(tmp); |
| 441 | 440 | ||
| 442 | /* Update zone information. */ |
441 | /* Update zone information. */ |
| 443 | zone->free_count -= (1 << order); |
442 | zone->free_count -= (1 << order); |
| 444 | zone->busy_count += (1 << order); |
443 | zone->busy_count += (1 << order); |
| 445 | 444 | ||
| 446 | /* Frame will be actually a first frame of the block. */ |
445 | /* Frame will be actually a first frame of the block. */ |
| 447 | frame = list_get_instance(tmp, frame_t, buddy_link); |
446 | frame = list_get_instance(tmp, frame_t, buddy_link); |
| 448 | 447 | ||
| 449 | /* get frame address */ |
448 | /* get frame address */ |
| 450 | v = make_frame_index(zone, frame); |
449 | v = make_frame_index(zone, frame); |
| 451 | return v; |
450 | return v; |
| 452 | } |
451 | } |
| 453 | 452 | ||
| 454 | /** Free frame from zone |
453 | /** Free frame from zone |
| 455 | * |
454 | * |
| 456 | * Assume zone is locked |
455 | * Assume zone is locked |
| 457 | */ |
456 | */ |
| 458 | static void zone_frame_free(zone_t *zone, index_t frame_idx) |
457 | static void zone_frame_free(zone_t *zone, index_t frame_idx) |
| 459 | { |
458 | { |
| 460 | frame_t *frame; |
459 | frame_t *frame; |
| 461 | __u8 order; |
460 | __u8 order; |
| 462 | 461 | ||
| 463 | frame = &zone->frames[frame_idx]; |
462 | frame = &zone->frames[frame_idx]; |
| 464 | 463 | ||
| 465 | /* remember frame order */ |
464 | /* remember frame order */ |
| 466 | order = frame->buddy_order; |
465 | order = frame->buddy_order; |
| 467 | 466 | ||
| 468 | ASSERT(frame->refcount); |
467 | ASSERT(frame->refcount); |
| 469 | 468 | ||
| 470 | if (!--frame->refcount) { |
469 | if (!--frame->refcount) { |
| 471 | buddy_system_free(zone->buddy_system, &frame->buddy_link); |
470 | buddy_system_free(zone->buddy_system, &frame->buddy_link); |
| - | 471 | ||
| - | 472 | /* Update zone information. */ |
|
| - | 473 | zone->free_count += (1 << order); |
|
| - | 474 | zone->busy_count -= (1 << order); |
|
| 472 | } |
475 | } |
| 473 | - | ||
| 474 | /* Update zone information. */ |
- | |
| 475 | zone->free_count += (1 << order); |
- | |
| 476 | zone->busy_count -= (1 << order); |
- | |
| 477 | } |
476 | } |
| 478 | 477 | ||
| 479 | /** Return frame from zone */ |
478 | /** Return frame from zone */ |
| 480 | static frame_t * zone_get_frame(zone_t *zone, index_t frame_idx) |
479 | static frame_t * zone_get_frame(zone_t *zone, index_t frame_idx) |
| 481 | { |
480 | { |
| 482 | ASSERT(frame_idx < zone->count); |
481 | ASSERT(frame_idx < zone->count); |
| 483 | return &zone->frames[frame_idx]; |
482 | return &zone->frames[frame_idx]; |
| 484 | } |
483 | } |
| 485 | 484 | ||
| 486 | /** Mark frame in zone unavailable to allocation */ |
485 | /** Mark frame in zone unavailable to allocation */ |
| 487 | static void zone_mark_unavailable(zone_t *zone, index_t frame_idx) |
486 | static void zone_mark_unavailable(zone_t *zone, index_t frame_idx) |
| 488 | { |
487 | { |
| 489 | frame_t *frame; |
488 | frame_t *frame; |
| 490 | link_t *link; |
489 | link_t *link; |
| 491 | 490 | ||
| 492 | frame = zone_get_frame(zone, frame_idx); |
491 | frame = zone_get_frame(zone, frame_idx); |
| 493 | if (frame->refcount) |
492 | if (frame->refcount) |
| 494 | return; |
493 | return; |
| 495 | link = buddy_system_alloc_block(zone->buddy_system, |
494 | link = buddy_system_alloc_block(zone->buddy_system, |
| 496 | &frame->buddy_link); |
495 | &frame->buddy_link); |
| 497 | ASSERT(link); |
496 | ASSERT(link); |
| 498 | zone->free_count--; |
497 | zone->free_count--; |
| 499 | } |
498 | } |
| 500 | 499 | ||
| 501 | /** |
500 | /** |
| 502 | * Join 2 zones |
501 | * Join 2 zones |
| 503 | * |
502 | * |
| 504 | * Expect zone_t *z to point to space at least zone_conf_size large |
503 | * Expect zone_t *z to point to space at least zone_conf_size large |
| 505 | * |
504 | * |
| 506 | * Assume z1 & z2 are locked |
505 | * Assume z1 & z2 are locked |
| 507 | */ |
506 | */ |
| 508 | 507 | ||
| 509 | static void _zone_merge(zone_t *z, zone_t *z1, zone_t *z2) |
508 | static void _zone_merge(zone_t *z, zone_t *z1, zone_t *z2) |
| 510 | { |
509 | { |
| 511 | __u8 max_order; |
510 | __u8 max_order; |
| 512 | int i, z2idx; |
511 | int i, z2idx; |
| 513 | pfn_t frame_idx; |
512 | pfn_t frame_idx; |
| 514 | frame_t *frame; |
513 | frame_t *frame; |
| 515 | 514 | ||
| 516 | ASSERT(!overlaps(z1->base,z1->count,z2->base,z2->count)); |
515 | ASSERT(!overlaps(z1->base,z1->count,z2->base,z2->count)); |
| 517 | ASSERT(z1->base < z2->base); |
516 | ASSERT(z1->base < z2->base); |
| 518 | 517 | ||
| 519 | spinlock_initialize(&z->lock, "zone_lock"); |
518 | spinlock_initialize(&z->lock, "zone_lock"); |
| 520 | z->base = z1->base; |
519 | z->base = z1->base; |
| 521 | z->count = z2->base+z2->count - z1->base; |
520 | z->count = z2->base+z2->count - z1->base; |
| 522 | z->flags = z1->flags & z2->flags; |
521 | z->flags = z1->flags & z2->flags; |
| 523 | 522 | ||
| 524 | z->free_count = z1->free_count + z2->free_count; |
523 | z->free_count = z1->free_count + z2->free_count; |
| 525 | z->busy_count = z1->busy_count + z2->busy_count; |
524 | z->busy_count = z1->busy_count + z2->busy_count; |
| 526 | 525 | ||
| 527 | max_order = fnzb(z->count); |
526 | max_order = fnzb(z->count); |
| 528 | 527 | ||
| 529 | z->buddy_system = (buddy_system_t *)&z[1]; |
528 | z->buddy_system = (buddy_system_t *)&z[1]; |
| 530 | buddy_system_create(z->buddy_system, max_order, |
529 | buddy_system_create(z->buddy_system, max_order, |
| 531 | &zone_buddy_system_operations, |
530 | &zone_buddy_system_operations, |
| 532 | (void *) z); |
531 | (void *) z); |
| 533 | 532 | ||
| 534 | z->frames = (frame_t *)((void *)z->buddy_system+buddy_conf_size(max_order)); |
533 | z->frames = (frame_t *)((void *)z->buddy_system+buddy_conf_size(max_order)); |
| 535 | for (i = 0; i < z->count; i++) { |
534 | for (i = 0; i < z->count; i++) { |
| 536 | /* This marks all frames busy */ |
535 | /* This marks all frames busy */ |
| 537 | frame_initialize(&z->frames[i]); |
536 | frame_initialize(&z->frames[i]); |
| 538 | } |
537 | } |
| 539 | /* Copy frames from both zones to preserve full frame orders, |
538 | /* Copy frames from both zones to preserve full frame orders, |
| 540 | * parents etc. Set all frames with refcount=0 to 1, because |
539 | * parents etc. Set all frames with refcount=0 to 1, because |
| 541 | * we add all free frames to buddy allocator later again, clear |
540 | * we add all free frames to buddy allocator later again, clear |
| 542 | * order to 0. |
541 | * order to 0. |
| 543 | */ |
542 | */ |
| 544 | for (i=0; i<z1->count; i++) |
543 | for (i=0; i<z1->count; i++) |
| 545 | z->frames[i] = z1->frames[i]; |
544 | z->frames[i] = z1->frames[i]; |
| 546 | for (i=0; i < z2->count; i++) { |
545 | for (i=0; i < z2->count; i++) { |
| 547 | z2idx = i + (z2->base - z1->base); |
546 | z2idx = i + (z2->base - z1->base); |
| 548 | z->frames[z2idx] = z2->frames[i]; |
547 | z->frames[z2idx] = z2->frames[i]; |
| 549 | } |
548 | } |
| 550 | for (i=0; i < z->count; i++) { |
549 | for (i=0; i < z->count; i++) { |
| 551 | if (!z->frames[i].refcount) { |
550 | if (!z->frames[i].refcount) { |
| 552 | z->frames[i].refcount = 1; |
551 | z->frames[i].refcount = 1; |
| 553 | z->frames[i].buddy_order = 0; |
552 | z->frames[i].buddy_order = 0; |
| 554 | } |
553 | } |
| 555 | } |
554 | } |
| 556 | /* Add free blocks from the 2 original zones */ |
555 | /* Add free blocks from the 2 original zones */ |
| 557 | while (zone_can_alloc(z1, 0)) { |
556 | while (zone_can_alloc(z1, 0)) { |
| 558 | frame_idx = zone_frame_alloc(z1, 0); |
557 | frame_idx = zone_frame_alloc(z1, 0); |
| 559 | frame = &z->frames[frame_idx]; |
558 | frame = &z->frames[frame_idx]; |
| 560 | frame->refcount = 0; |
559 | frame->refcount = 0; |
| 561 | buddy_system_free(z->buddy_system, &frame->buddy_link); |
560 | buddy_system_free(z->buddy_system, &frame->buddy_link); |
| 562 | } |
561 | } |
| 563 | while (zone_can_alloc(z2, 0)) { |
562 | while (zone_can_alloc(z2, 0)) { |
| 564 | frame_idx = zone_frame_alloc(z2, 0); |
563 | frame_idx = zone_frame_alloc(z2, 0); |
| 565 | frame = &z->frames[frame_idx + (z2->base-z1->base)]; |
564 | frame = &z->frames[frame_idx + (z2->base-z1->base)]; |
| 566 | frame->refcount = 0; |
565 | frame->refcount = 0; |
| 567 | buddy_system_free(z->buddy_system, &frame->buddy_link); |
566 | buddy_system_free(z->buddy_system, &frame->buddy_link); |
| 568 | } |
567 | } |
| 569 | } |
568 | } |
| 570 | 569 | ||
| 571 | /** Return old configuration frames into the zone |
570 | /** Return old configuration frames into the zone |
| 572 | * |
571 | * |
| 573 | * We have several cases |
572 | * We have several cases |
| 574 | * - the conf. data is outside of zone -> exit, shall we call frame_free?? |
573 | * - the conf. data is outside of zone -> exit, shall we call frame_free?? |
| 575 | * - the conf. data was created by zone_create or |
574 | * - the conf. data was created by zone_create or |
| 576 | * updated with reduce_region -> free every frame |
575 | * updated with reduce_region -> free every frame |
| 577 | * |
576 | * |
| 578 | * @param newzone The actual zone where freeing should occur |
577 | * @param newzone The actual zone where freeing should occur |
| 579 | * @param oldzone Pointer to old zone configuration data that should |
578 | * @param oldzone Pointer to old zone configuration data that should |
| 580 | * be freed from new zone |
579 | * be freed from new zone |
| 581 | */ |
580 | */ |
| 582 | static void return_config_frames(zone_t *newzone, zone_t *oldzone) |
581 | static void return_config_frames(zone_t *newzone, zone_t *oldzone) |
| 583 | { |
582 | { |
| 584 | pfn_t pfn; |
583 | pfn_t pfn; |
| 585 | frame_t *frame; |
584 | frame_t *frame; |
| 586 | count_t cframes; |
585 | count_t cframes; |
| 587 | int i; |
586 | int i; |
| 588 | 587 | ||
| 589 | pfn = ADDR2PFN((__address)KA2PA(oldzone)); |
588 | pfn = ADDR2PFN((__address)KA2PA(oldzone)); |
| 590 | cframes = SIZE2FRAMES(zone_conf_size(oldzone->count)); |
589 | cframes = SIZE2FRAMES(zone_conf_size(oldzone->count)); |
| 591 | 590 | ||
| 592 | if (pfn < newzone->base || pfn >= newzone->base + newzone->count) |
591 | if (pfn < newzone->base || pfn >= newzone->base + newzone->count) |
| 593 | return; |
592 | return; |
| 594 | 593 | ||
| 595 | frame = &newzone->frames[pfn - newzone->base]; |
594 | frame = &newzone->frames[pfn - newzone->base]; |
| 596 | ASSERT(!frame->buddy_order); |
595 | ASSERT(!frame->buddy_order); |
| 597 | 596 | ||
| 598 | for (i=0; i < cframes; i++) { |
597 | for (i=0; i < cframes; i++) { |
| 599 | newzone->busy_count++; |
598 | newzone->busy_count++; |
| 600 | zone_frame_free(newzone, pfn+i-newzone->base); |
599 | zone_frame_free(newzone, pfn+i-newzone->base); |
| 601 | } |
600 | } |
| 602 | } |
601 | } |
| 603 | 602 | ||
| 604 | - | ||
| 605 | /** Reduce allocated block to count of order 0 frames |
603 | /** Reduce allocated block to count of order 0 frames |
| 606 | * |
604 | * |
| 607 | * The allocated block need 2^order frames of space. Reduce all frames |
605 | * The allocated block need 2^order frames of space. Reduce all frames |
| 608 | * in block to order 0 and free the unneded frames. This means, that |
606 | * in block to order 0 and free the unneded frames. This means, that |
| 609 | * when freeing the block, you have to free every frame from block. |
607 | * when freeing the block, you have to free every frame from block. |
| 610 | * |
608 | * |
| 611 | * @param zone |
609 | * @param zone |
| 612 | * @param frame_idx Index to block |
610 | * @param frame_idx Index to block |
| 613 | * @param count Allocated space in block |
611 | * @param count Allocated space in block |
| 614 | */ |
612 | */ |
| 615 | static void zone_reduce_region(zone_t *zone, pfn_t frame_idx, count_t count) |
613 | static void zone_reduce_region(zone_t *zone, pfn_t frame_idx, count_t count) |
| 616 | { |
614 | { |
| 617 | count_t i; |
615 | count_t i; |
| 618 | __u8 order; |
616 | __u8 order; |
| 619 | frame_t *frame; |
617 | frame_t *frame; |
| 620 | 618 | ||
| 621 | ASSERT(frame_idx+count < zone->count); |
619 | ASSERT(frame_idx+count < zone->count); |
| 622 | 620 | ||
| 623 | order = zone->frames[frame_idx].buddy_order; |
621 | order = zone->frames[frame_idx].buddy_order; |
| 624 | ASSERT((1 << order) >= count); |
622 | ASSERT((1 << order) >= count); |
| 625 | 623 | ||
| 626 | /* Reduce all blocks to order 0 */ |
624 | /* Reduce all blocks to order 0 */ |
| 627 | for (i=0; i < (1 << order); i++) { |
625 | for (i=0; i < (1 << order); i++) { |
| 628 | frame = &zone->frames[i + frame_idx]; |
626 | frame = &zone->frames[i + frame_idx]; |
| 629 | frame->buddy_order = 0; |
627 | frame->buddy_order = 0; |
| 630 | if (! frame->refcount) |
628 | if (! frame->refcount) |
| 631 | frame->refcount = 1; |
629 | frame->refcount = 1; |
| 632 | ASSERT(frame->refcount == 1); |
630 | ASSERT(frame->refcount == 1); |
| 633 | } |
631 | } |
| 634 | /* Free unneeded frames */ |
632 | /* Free unneeded frames */ |
| 635 | for (i=count; i < (1 << order); i++) { |
633 | for (i=count; i < (1 << order); i++) { |
| 636 | zone_frame_free(zone, i + frame_idx); |
634 | zone_frame_free(zone, i + frame_idx); |
| 637 | } |
635 | } |
| 638 | } |
636 | } |
| 639 | 637 | ||
| 640 | /** Merge zones z1 and z2 |
638 | /** Merge zones z1 and z2 |
| 641 | * |
639 | * |
| 642 | * - the zones must be 2 zones with no zone existing in between, |
640 | * - the zones must be 2 zones with no zone existing in between, |
| 643 | * which means that z2 = z1+1 |
641 | * which means that z2 = z1+1 |
| 644 | * |
642 | * |
| 645 | * - When you create a new zone, the frame allocator configuration does |
643 | * - When you create a new zone, the frame allocator configuration does |
| 646 | * not to be 2^order size. Once the allocator is running it is no longer |
644 | * not to be 2^order size. Once the allocator is running it is no longer |
| 647 | * possible, merged configuration data occupies more space :-/ |
645 | * possible, merged configuration data occupies more space :-/ |
| 648 | */ |
646 | */ |
| 649 | void zone_merge(int z1, int z2) |
647 | void zone_merge(int z1, int z2) |
| 650 | { |
648 | { |
| 651 | ipl_t ipl; |
649 | ipl_t ipl; |
| 652 | zone_t *zone1, *zone2, *newzone; |
650 | zone_t *zone1, *zone2, *newzone; |
| 653 | int cframes; |
651 | int cframes; |
| 654 | __u8 order; |
652 | __u8 order; |
| 655 | int i; |
653 | int i; |
| 656 | pfn_t pfn; |
654 | pfn_t pfn; |
| 657 | 655 | ||
| 658 | ipl = interrupts_disable(); |
656 | ipl = interrupts_disable(); |
| 659 | spinlock_lock(&zones.lock); |
657 | spinlock_lock(&zones.lock); |
| 660 | 658 | ||
| 661 | if (z1 < 0 || z1 >= zones.count || z2 < 0 || z2 >= zones.count) |
659 | if (z1 < 0 || z1 >= zones.count || z2 < 0 || z2 >= zones.count) |
| 662 | goto errout; |
660 | goto errout; |
| 663 | /* We can join only 2 zones with none existing inbetween */ |
661 | /* We can join only 2 zones with none existing inbetween */ |
| 664 | if (z2-z1 != 1) |
662 | if (z2-z1 != 1) |
| 665 | goto errout; |
663 | goto errout; |
| 666 | 664 | ||
| 667 | zone1 = zones.info[z1]; |
665 | zone1 = zones.info[z1]; |
| 668 | zone2 = zones.info[z2]; |
666 | zone2 = zones.info[z2]; |
| 669 | spinlock_lock(&zone1->lock); |
667 | spinlock_lock(&zone1->lock); |
| 670 | spinlock_lock(&zone2->lock); |
668 | spinlock_lock(&zone2->lock); |
| 671 | 669 | ||
| 672 | cframes = SIZE2FRAMES(zone_conf_size(zone2->base+zone2->count-zone1->base)); |
670 | cframes = SIZE2FRAMES(zone_conf_size(zone2->base+zone2->count-zone1->base)); |
| 673 | order = fnzb(cframes) + 1; |
671 | order = fnzb(cframes) + 1; |
| 674 | 672 | ||
| 675 | /* Allocate zonedata inside one of the zones */ |
673 | /* Allocate zonedata inside one of the zones */ |
| 676 | if (zone_can_alloc(zone1, order)) |
674 | if (zone_can_alloc(zone1, order)) |
| 677 | pfn = zone1->base + zone_frame_alloc(zone1, order); |
675 | pfn = zone1->base + zone_frame_alloc(zone1, order); |
| 678 | else if (zone_can_alloc(zone2, order)) |
676 | else if (zone_can_alloc(zone2, order)) |
| 679 | pfn = zone2->base + zone_frame_alloc(zone2, order); |
677 | pfn = zone2->base + zone_frame_alloc(zone2, order); |
| 680 | else |
678 | else |
| 681 | goto errout2; |
679 | goto errout2; |
| 682 | 680 | ||
| 683 | newzone = (zone_t *)PA2KA(PFN2ADDR(pfn)); |
681 | newzone = (zone_t *)PA2KA(PFN2ADDR(pfn)); |
| 684 | 682 | ||
| 685 | _zone_merge(newzone, zone1, zone2); |
683 | _zone_merge(newzone, zone1, zone2); |
| 686 | 684 | ||
| 687 | /* Free unneeded config frames */ |
685 | /* Free unneeded config frames */ |
| 688 | zone_reduce_region(newzone, pfn - newzone->base, cframes); |
686 | zone_reduce_region(newzone, pfn - newzone->base, cframes); |
| 689 | /* Subtract zone information from busy frames */ |
687 | /* Subtract zone information from busy frames */ |
| 690 | newzone->busy_count -= cframes; |
688 | newzone->busy_count -= cframes; |
| 691 | 689 | ||
| 692 | /* Replace existing zones in zoneinfo list */ |
690 | /* Replace existing zones in zoneinfo list */ |
| 693 | zones.info[z1] = newzone; |
691 | zones.info[z1] = newzone; |
| 694 | for (i=z2+1;i < zones.count;i++) |
692 | for (i=z2+1;i < zones.count;i++) |
| 695 | zones.info[i-1] = zones.info[i]; |
693 | zones.info[i-1] = zones.info[i]; |
| 696 | zones.count--; |
694 | zones.count--; |
| 697 | 695 | ||
| 698 | /* Free old zone information */ |
696 | /* Free old zone information */ |
| 699 | return_config_frames(newzone, zone1); |
697 | return_config_frames(newzone, zone1); |
| 700 | return_config_frames(newzone, zone2); |
698 | return_config_frames(newzone, zone2); |
| 701 | errout2: |
699 | errout2: |
| 702 | /* Nobody is allowed to enter to zone, so we are safe |
700 | /* Nobody is allowed to enter to zone, so we are safe |
| 703 | * to touch the spinlocks last time */ |
701 | * to touch the spinlocks last time */ |
| 704 | spinlock_unlock(&zone1->lock); |
702 | spinlock_unlock(&zone1->lock); |
| 705 | spinlock_unlock(&zone2->lock); |
703 | spinlock_unlock(&zone2->lock); |
| 706 | errout: |
704 | errout: |
| 707 | spinlock_unlock(&zones.lock); |
705 | spinlock_unlock(&zones.lock); |
| 708 | interrupts_restore(ipl); |
706 | interrupts_restore(ipl); |
| 709 | } |
707 | } |
| 710 | 708 | ||
| 711 | - | ||
| 712 | /** |
709 | /** |
| 713 | * Merge all zones into one big zone |
710 | * Merge all zones into one big zone |
| 714 | * |
711 | * |
| 715 | * It is reasonable to do this on systems whose bios reports parts in chunks, |
712 | * It is reasonable to do this on systems whose bios reports parts in chunks, |
| 716 | * so that we could have 1 zone (it's faster). |
713 | * so that we could have 1 zone (it's faster). |
| 717 | */ |
714 | */ |
| 718 | void zone_merge_all(void) |
715 | void zone_merge_all(void) |
| 719 | { |
716 | { |
| 720 | int count = zones.count; |
717 | int count = zones.count; |
| 721 | 718 | ||
| 722 | while (zones.count > 1 && --count) { |
719 | while (zones.count > 1 && --count) { |
| 723 | zone_merge(0,1); |
720 | zone_merge(0,1); |
| 724 | break; |
721 | break; |
| 725 | } |
722 | } |
| 726 | } |
723 | } |
| 727 | 724 | ||
| 728 | /** Create frame zone |
725 | /** Create frame zone |
| 729 | * |
726 | * |
| 730 | * Create new frame zone. |
727 | * Create new frame zone. |
| 731 | * |
728 | * |
| 732 | * @param start Physical address of the first frame within the zone. |
729 | * @param start Physical address of the first frame within the zone. |
| 733 | * @param size Size of the zone. Must be a multiple of FRAME_SIZE. |
730 | * @param size Size of the zone. Must be a multiple of FRAME_SIZE. |
| 734 | * @param conffram Address of configuration frame |
731 | * @param conffram Address of configuration frame |
| 735 | * @param flags Zone flags. |
732 | * @param flags Zone flags. |
| 736 | * |
733 | * |
| 737 | * @return Initialized zone. |
734 | * @return Initialized zone. |
| 738 | */ |
735 | */ |
| 739 | static void zone_construct(pfn_t start, count_t count, zone_t *z, int flags) |
736 | static void zone_construct(pfn_t start, count_t count, zone_t *z, int flags) |
| 740 | { |
737 | { |
| 741 | int i; |
738 | int i; |
| 742 | __u8 max_order; |
739 | __u8 max_order; |
| 743 | 740 | ||
| 744 | spinlock_initialize(&z->lock, "zone_lock"); |
741 | spinlock_initialize(&z->lock, "zone_lock"); |
| 745 | z->base = start; |
742 | z->base = start; |
| 746 | z->count = count; |
743 | z->count = count; |
| 747 | z->flags = flags; |
744 | z->flags = flags; |
| 748 | z->free_count = count; |
745 | z->free_count = count; |
| 749 | z->busy_count = 0; |
746 | z->busy_count = 0; |
| 750 | 747 | ||
| 751 | /* |
748 | /* |
| 752 | * Compute order for buddy system, initialize |
749 | * Compute order for buddy system, initialize |
| 753 | */ |
750 | */ |
| 754 | max_order = fnzb(count); |
751 | max_order = fnzb(count); |
| 755 | z->buddy_system = (buddy_system_t *)&z[1]; |
752 | z->buddy_system = (buddy_system_t *)&z[1]; |
| 756 | 753 | ||
| 757 | buddy_system_create(z->buddy_system, max_order, |
754 | buddy_system_create(z->buddy_system, max_order, |
| 758 | &zone_buddy_system_operations, |
755 | &zone_buddy_system_operations, |
| 759 | (void *) z); |
756 | (void *) z); |
| 760 | 757 | ||
| 761 | /* Allocate frames _after_ the conframe */ |
758 | /* Allocate frames _after_ the conframe */ |
| 762 | /* Check sizes */ |
759 | /* Check sizes */ |
| 763 | z->frames = (frame_t *)((void *)z->buddy_system+buddy_conf_size(max_order)); |
760 | z->frames = (frame_t *)((void *)z->buddy_system+buddy_conf_size(max_order)); |
| 764 | for (i = 0; i<count; i++) { |
761 | for (i = 0; i<count; i++) { |
| 765 | frame_initialize(&z->frames[i]); |
762 | frame_initialize(&z->frames[i]); |
| 766 | } |
763 | } |
| 767 | 764 | ||
| 768 | /* Stuffing frames */ |
765 | /* Stuffing frames */ |
| 769 | for (i = 0; i < count; i++) { |
766 | for (i = 0; i < count; i++) { |
| 770 | z->frames[i].refcount = 0; |
767 | z->frames[i].refcount = 0; |
| 771 | buddy_system_free(z->buddy_system, &z->frames[i].buddy_link); |
768 | buddy_system_free(z->buddy_system, &z->frames[i].buddy_link); |
| 772 | } |
769 | } |
| 773 | } |
770 | } |
| 774 | 771 | ||
| 775 | - | ||
| 776 | /** Compute configuration data size for zone */ |
772 | /** Compute configuration data size for zone */ |
| 777 | __address zone_conf_size(count_t count) |
773 | __address zone_conf_size(count_t count) |
| 778 | { |
774 | { |
| 779 | int size = sizeof(zone_t) + count*sizeof(frame_t); |
775 | int size = sizeof(zone_t) + count*sizeof(frame_t); |
| 780 | int max_order; |
776 | int max_order; |
| 781 | 777 | ||
| 782 | max_order = fnzb(count); |
778 | max_order = fnzb(count); |
| 783 | size += buddy_conf_size(max_order); |
779 | size += buddy_conf_size(max_order); |
| 784 | return size; |
780 | return size; |
| 785 | } |
781 | } |
| 786 | 782 | ||
| 787 | - | ||
| 788 | /** Create and add zone to system |
783 | /** Create and add zone to system |
| 789 | * |
784 | * |
| 790 | * @param confframe Where configuration frame is supposed to be. |
785 | * @param confframe Where configuration frame is supposed to be. |
| 791 | * Always check, that we will not disturb the kernel and possibly init. |
786 | * Always check, that we will not disturb the kernel and possibly init. |
| 792 | * If confframe is given _outside_ this zone, it is expected, |
787 | * If confframe is given _outside_ this zone, it is expected, |
| 793 | * that the area is already marked BUSY and big enough |
788 | * that the area is already marked BUSY and big enough |
| 794 | * to contain zone_conf_size() amount of data |
789 | * to contain zone_conf_size() amount of data |
| 795 | * |
790 | * |
| 796 | * @return Zone number or -1 on error |
791 | * @return Zone number or -1 on error |
| 797 | */ |
792 | */ |
| 798 | int zone_create(pfn_t start, count_t count, pfn_t confframe, int flags) |
793 | int zone_create(pfn_t start, count_t count, pfn_t confframe, int flags) |
| 799 | { |
794 | { |
| 800 | zone_t *z; |
795 | zone_t *z; |
| 801 | __address addr; |
796 | __address addr; |
| 802 | count_t confcount; |
797 | count_t confcount; |
| 803 | int i; |
798 | int i; |
| 804 | int znum; |
799 | int znum; |
| 805 | 800 | ||
| 806 | /* Theoretically we could have here 0, practically make sure |
801 | /* Theoretically we could have here 0, practically make sure |
| 807 | * nobody tries to do that. If some platform requires, remove |
802 | * nobody tries to do that. If some platform requires, remove |
| 808 | * the assert |
803 | * the assert |
| 809 | */ |
804 | */ |
| 810 | ASSERT(confframe); |
805 | ASSERT(confframe); |
| 811 | /* If conframe is supposed to be inside our zone, then make sure |
806 | /* If conframe is supposed to be inside our zone, then make sure |
| 812 | * it does not span kernel & init |
807 | * it does not span kernel & init |
| 813 | */ |
808 | */ |
| 814 | confcount = SIZE2FRAMES(zone_conf_size(count)); |
809 | confcount = SIZE2FRAMES(zone_conf_size(count)); |
| 815 | if (confframe >= start && confframe < start+count) { |
810 | if (confframe >= start && confframe < start+count) { |
| 816 | for (;confframe < start+count;confframe++) { |
811 | for (;confframe < start+count;confframe++) { |
| 817 | addr = PFN2ADDR(confframe); |
812 | addr = PFN2ADDR(confframe); |
| 818 | if (overlaps(addr, PFN2ADDR(confcount), |
813 | if (overlaps(addr, PFN2ADDR(confcount), |
| 819 | KA2PA(config.base),config.kernel_size)) |
814 | KA2PA(config.base),config.kernel_size)) |
| 820 | continue; |
815 | continue; |
| 821 | if (config.init_addr) |
816 | if (config.init_addr) |
| 822 | if (overlaps(addr,PFN2ADDR(confcount), |
817 | if (overlaps(addr,PFN2ADDR(confcount), |
| 823 | KA2PA(config.init_addr), |
818 | KA2PA(config.init_addr), |
| 824 | config.init_size)) |
819 | config.init_size)) |
| 825 | continue; |
820 | continue; |
| 826 | break; |
821 | break; |
| 827 | } |
822 | } |
| 828 | if (confframe >= start+count) |
823 | if (confframe >= start+count) |
| 829 | panic("Cannot find configuration data for zone."); |
824 | panic("Cannot find configuration data for zone."); |
| 830 | } |
825 | } |
| 831 | 826 | ||
| 832 | z = (zone_t *)PA2KA(PFN2ADDR(confframe)); |
827 | z = (zone_t *)PA2KA(PFN2ADDR(confframe)); |
| 833 | zone_construct(start, count, z, flags); |
828 | zone_construct(start, count, z, flags); |
| 834 | znum = zones_add_zone(z); |
829 | znum = zones_add_zone(z); |
| 835 | if (znum == -1) |
830 | if (znum == -1) |
| 836 | return -1; |
831 | return -1; |
| 837 | 832 | ||
| 838 | /* If confdata in zone, mark as unavailable */ |
833 | /* If confdata in zone, mark as unavailable */ |
| 839 | if (confframe >= start && confframe < start+count) |
834 | if (confframe >= start && confframe < start+count) |
| 840 | for (i=confframe; i<confframe+confcount; i++) { |
835 | for (i=confframe; i<confframe+confcount; i++) { |
| 841 | zone_mark_unavailable(z, i - z->base); |
836 | zone_mark_unavailable(z, i - z->base); |
| 842 | } |
837 | } |
| 843 | return znum; |
838 | return znum; |
| 844 | } |
839 | } |
| 845 | 840 | ||
| 846 | /***************************************/ |
841 | /***************************************/ |
| 847 | /* Frame functions */ |
842 | /* Frame functions */ |
| 848 | 843 | ||
| 849 | /** Set parent of frame */ |
844 | /** Set parent of frame */ |
| 850 | void frame_set_parent(pfn_t pfn, void *data, int hint) |
845 | void frame_set_parent(pfn_t pfn, void *data, int hint) |
| 851 | { |
846 | { |
| 852 | zone_t *zone = find_zone_and_lock(pfn, &hint); |
847 | zone_t *zone = find_zone_and_lock(pfn, &hint); |
| 853 | 848 | ||
| 854 | ASSERT(zone); |
849 | ASSERT(zone); |
| 855 | 850 | ||
| 856 | zone_get_frame(zone, pfn-zone->base)->parent = data; |
851 | zone_get_frame(zone, pfn-zone->base)->parent = data; |
| 857 | spinlock_unlock(&zone->lock); |
852 | spinlock_unlock(&zone->lock); |
| 858 | } |
853 | } |
| 859 | 854 | ||
| 860 | void * frame_get_parent(pfn_t pfn, int hint) |
855 | void * frame_get_parent(pfn_t pfn, int hint) |
| 861 | { |
856 | { |
| 862 | zone_t *zone = find_zone_and_lock(pfn, &hint); |
857 | zone_t *zone = find_zone_and_lock(pfn, &hint); |
| 863 | void *res; |
858 | void *res; |
| 864 | 859 | ||
| 865 | ASSERT(zone); |
860 | ASSERT(zone); |
| 866 | res = zone_get_frame(zone, pfn - zone->base)->parent; |
861 | res = zone_get_frame(zone, pfn - zone->base)->parent; |
| 867 | 862 | ||
| 868 | spinlock_unlock(&zone->lock); |
863 | spinlock_unlock(&zone->lock); |
| 869 | return res; |
864 | return res; |
| 870 | } |
865 | } |
| 871 | 866 | ||
| 872 | /** Allocate power-of-two frames of physical memory. |
867 | /** Allocate power-of-two frames of physical memory. |
| 873 | * |
868 | * |
| 874 | * @param flags Flags for host zone selection and address processing. |
869 | * @param flags Flags for host zone selection and address processing. |
| 875 | * @param order Allocate exactly 2^order frames. |
870 | * @param order Allocate exactly 2^order frames. |
| 876 | * @param pzone Preferred zone |
871 | * @param pzone Preferred zone |
| 877 | * |
872 | * |
| 878 | * @return Allocated frame. |
873 | * @return Allocated frame. |
| 879 | */ |
874 | */ |
| 880 | pfn_t frame_alloc_generic(__u8 order, int flags, int * status, int *pzone) |
875 | pfn_t frame_alloc_generic(__u8 order, int flags, int * status, int *pzone) |
| 881 | { |
876 | { |
| 882 | ipl_t ipl; |
877 | ipl_t ipl; |
| 883 | int freed; |
878 | int freed; |
| 884 | pfn_t v; |
879 | pfn_t v; |
| 885 | zone_t *zone; |
880 | zone_t *zone; |
| 886 | 881 | ||
| 887 | loop: |
882 | loop: |
| 888 | ipl = interrupts_disable(); |
883 | ipl = interrupts_disable(); |
| 889 | /* |
884 | /* |
| 890 | * First, find suitable frame zone. |
885 | * First, find suitable frame zone. |
| 891 | */ |
886 | */ |
| 892 | zone = find_free_zone_lock(order,pzone); |
887 | zone = find_free_zone_lock(order,pzone); |
| 893 | /* If no memory, reclaim some slab memory, |
888 | /* If no memory, reclaim some slab memory, |
| 894 | if it does not help, reclaim all */ |
889 | if it does not help, reclaim all */ |
| 895 | if (!zone && !(flags & FRAME_NO_RECLAIM)) { |
890 | if (!zone && !(flags & FRAME_NO_RECLAIM)) { |
| 896 | freed = slab_reclaim(0); |
891 | freed = slab_reclaim(0); |
| 897 | if (freed) |
892 | if (freed) |
| 898 | zone = find_free_zone_lock(order,pzone); |
893 | zone = find_free_zone_lock(order,pzone); |
| 899 | if (!zone) { |
894 | if (!zone) { |
| 900 | freed = slab_reclaim(SLAB_RECLAIM_ALL); |
895 | freed = slab_reclaim(SLAB_RECLAIM_ALL); |
| 901 | if (freed) |
896 | if (freed) |
| 902 | zone = find_free_zone_lock(order,pzone); |
897 | zone = find_free_zone_lock(order,pzone); |
| 903 | } |
898 | } |
| 904 | } |
899 | } |
| 905 | if (!zone) { |
900 | if (!zone) { |
| 906 | if (flags & FRAME_PANIC) |
901 | if (flags & FRAME_PANIC) |
| 907 | panic("Can't allocate frame.\n"); |
902 | panic("Can't allocate frame.\n"); |
| 908 | 903 | ||
| 909 | /* |
904 | /* |
| 910 | * TODO: Sleep until frames are available again. |
905 | * TODO: Sleep until frames are available again. |
| 911 | */ |
906 | */ |
| 912 | interrupts_restore(ipl); |
907 | interrupts_restore(ipl); |
| 913 | 908 | ||
| 914 | if (flags & FRAME_ATOMIC) { |
909 | if (flags & FRAME_ATOMIC) { |
| 915 | ASSERT(status != NULL); |
910 | ASSERT(status != NULL); |
| 916 | if (status) |
911 | if (status) |
| 917 | *status = FRAME_NO_MEMORY; |
912 | *status = FRAME_NO_MEMORY; |
| 918 | return NULL; |
913 | return NULL; |
| 919 | } |
914 | } |
| 920 | 915 | ||
| 921 | panic("Sleep not implemented.\n"); |
916 | panic("Sleep not implemented.\n"); |
| 922 | goto loop; |
917 | goto loop; |
| 923 | } |
918 | } |
| 924 | v = zone_frame_alloc(zone,order); |
919 | v = zone_frame_alloc(zone,order); |
| 925 | v += zone->base; |
920 | v += zone->base; |
| 926 | 921 | ||
| 927 | spinlock_unlock(&zone->lock); |
922 | spinlock_unlock(&zone->lock); |
| 928 | interrupts_restore(ipl); |
923 | interrupts_restore(ipl); |
| 929 | 924 | ||
| 930 | if (status) |
925 | if (status) |
| 931 | *status = FRAME_OK; |
926 | *status = FRAME_OK; |
| 932 | return v; |
927 | return v; |
| 933 | } |
928 | } |
| 934 | 929 | ||
| 935 | /** Free a frame. |
930 | /** Free a frame. |
| 936 | * |
931 | * |
| 937 | * Find respective frame structure for supplied addr. |
932 | * Find respective frame structure for supplied addr. |
| 938 | * Decrement frame reference count. |
933 | * Decrement frame reference count. |
| 939 | * If it drops to zero, move the frame structure to free list. |
934 | * If it drops to zero, move the frame structure to free list. |
| 940 | * |
935 | * |
| 941 | * @param frame Frame no to be freed. |
936 | * @param frame Frame no to be freed. |
| 942 | */ |
937 | */ |
| 943 | void frame_free(pfn_t pfn) |
938 | void frame_free(pfn_t pfn) |
| 944 | { |
939 | { |
| 945 | ipl_t ipl; |
940 | ipl_t ipl; |
| 946 | zone_t *zone; |
941 | zone_t *zone; |
| 947 | 942 | ||
| 948 | ipl = interrupts_disable(); |
943 | ipl = interrupts_disable(); |
| 949 | 944 | ||
| 950 | /* |
945 | /* |
| 951 | * First, find host frame zone for addr. |
946 | * First, find host frame zone for addr. |
| 952 | */ |
947 | */ |
| 953 | zone = find_zone_and_lock(pfn,NULL); |
948 | zone = find_zone_and_lock(pfn,NULL); |
| 954 | ASSERT(zone); |
949 | ASSERT(zone); |
| 955 | 950 | ||
| 956 | zone_frame_free(zone, pfn-zone->base); |
951 | zone_frame_free(zone, pfn-zone->base); |
| 957 | 952 | ||
| 958 | spinlock_unlock(&zone->lock); |
953 | spinlock_unlock(&zone->lock); |
| 959 | interrupts_restore(ipl); |
954 | interrupts_restore(ipl); |
| 960 | } |
955 | } |
| 961 | 956 | ||
| 962 | 957 | ||
| 963 | 958 | ||
| 964 | /** Mark given range unavailable in frame zones */ |
959 | /** Mark given range unavailable in frame zones */ |
| 965 | void frame_mark_unavailable(pfn_t start, count_t count) |
960 | void frame_mark_unavailable(pfn_t start, count_t count) |
| 966 | { |
961 | { |
| 967 | int i; |
962 | int i; |
| 968 | zone_t *zone; |
963 | zone_t *zone; |
| 969 | int prefzone = 0; |
964 | int prefzone = 0; |
| 970 | 965 | ||
| 971 | for (i=0; i < count; i++) { |
966 | for (i=0; i < count; i++) { |
| 972 | zone = find_zone_and_lock(start+i,&prefzone); |
967 | zone = find_zone_and_lock(start+i,&prefzone); |
| 973 | if (!zone) /* PFN not found */ |
968 | if (!zone) /* PFN not found */ |
| 974 | continue; |
969 | continue; |
| 975 | zone_mark_unavailable(zone, start+i-zone->base); |
970 | zone_mark_unavailable(zone, start+i-zone->base); |
| 976 | 971 | ||
| 977 | spinlock_unlock(&zone->lock); |
972 | spinlock_unlock(&zone->lock); |
| 978 | } |
973 | } |
| 979 | } |
974 | } |
| 980 | 975 | ||
| 981 | /** Initialize physical memory management |
976 | /** Initialize physical memory management |
| 982 | * |
977 | * |
| 983 | * Initialize physical memory managemnt. |
978 | * Initialize physical memory managemnt. |
| 984 | */ |
979 | */ |
| 985 | void frame_init(void) |
980 | void frame_init(void) |
| 986 | { |
981 | { |
| 987 | if (config.cpu_active == 1) { |
982 | if (config.cpu_active == 1) { |
| 988 | zones.count = 0; |
983 | zones.count = 0; |
| 989 | spinlock_initialize(&zones.lock,"zones_glob_lock"); |
984 | spinlock_initialize(&zones.lock,"zones_glob_lock"); |
| 990 | } |
985 | } |
| 991 | /* Tell the architecture to create some memory */ |
986 | /* Tell the architecture to create some memory */ |
| 992 | frame_arch_init(); |
987 | frame_arch_init(); |
| 993 | if (config.cpu_active == 1) { |
988 | if (config.cpu_active == 1) { |
| 994 | pfn_t firstframe = ADDR2PFN(KA2PA(config.base)); |
989 | pfn_t firstframe = ADDR2PFN(KA2PA(config.base)); |
| 995 | pfn_t lastframe = ADDR2PFN(KA2PA(config.base+config.kernel_size)); |
990 | pfn_t lastframe = ADDR2PFN(KA2PA(config.base+config.kernel_size)); |
| 996 | frame_mark_unavailable(firstframe,lastframe-firstframe+1); |
991 | frame_mark_unavailable(firstframe,lastframe-firstframe+1); |
| 997 | if (config.init_size > 0) |
992 | if (config.init_size > 0) |
| 998 | frame_mark_unavailable(ADDR2PFN(KA2PA(config.init_addr)), |
993 | frame_mark_unavailable(ADDR2PFN(KA2PA(config.init_addr)), |
| 999 | SIZE2FRAMES(config.init_size)); |
994 | SIZE2FRAMES(config.init_size)); |
| 1000 | } |
995 | } |
| 1001 | } |
996 | } |
| 1002 | 997 | ||
| 1003 | 998 | ||
| 1004 | 999 | ||
| 1005 | /** Prints list of zones |
1000 | /** Prints list of zones |
| 1006 | * |
1001 | * |
| 1007 | */ |
1002 | */ |
| 1008 | void zone_print_list(void) { |
1003 | void zone_print_list(void) { |
| 1009 | zone_t *zone = NULL; |
1004 | zone_t *zone = NULL; |
| 1010 | int i; |
1005 | int i; |
| 1011 | ipl_t ipl; |
1006 | ipl_t ipl; |
| 1012 | 1007 | ||
| 1013 | ipl = interrupts_disable(); |
1008 | ipl = interrupts_disable(); |
| 1014 | spinlock_lock(&zones.lock); |
1009 | spinlock_lock(&zones.lock); |
| 1015 | printf("# Base address\tFree Frames\tBusy Frames\n"); |
1010 | printf("# Base address\tFree Frames\tBusy Frames\n"); |
| 1016 | printf(" ------------\t-----------\t-----------\n"); |
1011 | printf(" ------------\t-----------\t-----------\n"); |
| 1017 | for (i=0;i<zones.count;i++) { |
1012 | for (i=0;i<zones.count;i++) { |
| 1018 | zone = zones.info[i]; |
1013 | zone = zones.info[i]; |
| 1019 | spinlock_lock(&zone->lock); |
1014 | spinlock_lock(&zone->lock); |
| 1020 | printf("%d: %L\t%d\t\t%d\n",i,PFN2ADDR(zone->base), |
1015 | printf("%d: %L\t%d\t\t%d\n",i,PFN2ADDR(zone->base), |
| 1021 | zone->free_count, zone->busy_count); |
1016 | zone->free_count, zone->busy_count); |
| 1022 | spinlock_unlock(&zone->lock); |
1017 | spinlock_unlock(&zone->lock); |
| 1023 | } |
1018 | } |
| 1024 | spinlock_unlock(&zones.lock); |
1019 | spinlock_unlock(&zones.lock); |
| 1025 | interrupts_restore(ipl); |
1020 | interrupts_restore(ipl); |
| 1026 | } |
1021 | } |
| 1027 | 1022 | ||
| 1028 | /** Prints zone details |
1023 | /** Prints zone details |
| 1029 | * |
1024 | * |
| 1030 | * @param base Zone base address OR zone number |
1025 | * @param base Zone base address OR zone number |
| 1031 | */ |
1026 | */ |
| 1032 | void zone_print_one(int num) { |
1027 | void zone_print_one(int num) { |
| 1033 | zone_t *zone = NULL; |
1028 | zone_t *zone = NULL; |
| 1034 | ipl_t ipl; |
1029 | ipl_t ipl; |
| 1035 | int i; |
1030 | int i; |
| 1036 | 1031 | ||
| 1037 | ipl = interrupts_disable(); |
1032 | ipl = interrupts_disable(); |
| 1038 | spinlock_lock(&zones.lock); |
1033 | spinlock_lock(&zones.lock); |
| 1039 | 1034 | ||
| 1040 | for (i=0;i < zones.count; i++) { |
1035 | for (i=0;i < zones.count; i++) { |
| 1041 | if (i == num || PFN2ADDR(zones.info[i]->base) == num) { |
1036 | if (i == num || PFN2ADDR(zones.info[i]->base) == num) { |
| 1042 | zone = zones.info[i]; |
1037 | zone = zones.info[i]; |
| 1043 | break; |
1038 | break; |
| 1044 | } |
1039 | } |
| 1045 | } |
1040 | } |
| 1046 | if (!zone) { |
1041 | if (!zone) { |
| 1047 | printf("Zone not found.\n"); |
1042 | printf("Zone not found.\n"); |
| 1048 | goto out; |
1043 | goto out; |
| 1049 | } |
1044 | } |
| 1050 | 1045 | ||
| 1051 | spinlock_lock(&zone->lock); |
1046 | spinlock_lock(&zone->lock); |
| 1052 | printf("Memory zone information\n"); |
1047 | printf("Memory zone information\n"); |
| 1053 | printf("Zone base address: %P\n", PFN2ADDR(zone->base)); |
1048 | printf("Zone base address: %P\n", PFN2ADDR(zone->base)); |
| 1054 | printf("Zone size: %d frames (%dK)\n", zone->count, ((zone->count) * FRAME_SIZE) >> 10); |
1049 | printf("Zone size: %d frames (%dK)\n", zone->count, ((zone->count) * FRAME_SIZE) >> 10); |
| 1055 | printf("Allocated space: %d frames (%dK)\n", zone->busy_count, (zone->busy_count * FRAME_SIZE) >> 10); |
1050 | printf("Allocated space: %d frames (%dK)\n", zone->busy_count, (zone->busy_count * FRAME_SIZE) >> 10); |
| 1056 | printf("Available space: %d (%dK)\n", zone->free_count, (zone->free_count * FRAME_SIZE) >> 10); |
1051 | printf("Available space: %d (%dK)\n", zone->free_count, (zone->free_count * FRAME_SIZE) >> 10); |
| 1057 | buddy_system_structure_print(zone->buddy_system, FRAME_SIZE); |
1052 | buddy_system_structure_print(zone->buddy_system, FRAME_SIZE); |
| 1058 | 1053 | ||
| 1059 | spinlock_unlock(&zone->lock); |
1054 | spinlock_unlock(&zone->lock); |
| 1060 | out: |
1055 | out: |
| 1061 | spinlock_unlock(&zones.lock); |
1056 | spinlock_unlock(&zones.lock); |
| 1062 | interrupts_restore(ipl); |
1057 | interrupts_restore(ipl); |
| 1063 | } |
1058 | } |
| 1064 | 1059 | ||
| 1065 | 1060 | ||