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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <typedefs.h> |
29 | #include <typedefs.h> |
30 | #include <arch/types.h> |
30 | #include <arch/types.h> |
31 | #include <mm/heap.h> |
31 | #include <mm/heap.h> |
32 | #include <mm/frame.h> |
32 | #include <mm/frame.h> |
33 | #include <mm/vm.h> |
33 | #include <mm/vm.h> |
34 | #include <panic.h> |
34 | #include <panic.h> |
35 | #include <debug.h> |
35 | #include <debug.h> |
36 | #include <list.h> |
36 | #include <list.h> |
37 | #include <synch/spinlock.h> |
37 | #include <synch/spinlock.h> |
38 | #include <arch/asm.h> |
38 | #include <arch/asm.h> |
39 | #include <arch.h> |
39 | #include <arch.h> |
40 | #include <print.h> |
40 | #include <print.h> |
41 | 41 | ||
42 | spinlock_t zone_head_lock; /**< this lock protects zone_head list */ |
42 | spinlock_t zone_head_lock; /**< this lock protects zone_head list */ |
43 | link_t zone_head; /**< list of all zones in the system */ |
43 | link_t zone_head; /**< list of all zones in the system */ |
44 | 44 | ||
45 | region_t zone_blacklist[ZONE_BLACKLIST_SIZE]; |
45 | region_t zone_blacklist[ZONE_BLACKLIST_SIZE]; |
46 | count_t zone_blacklist_count = 0; |
46 | count_t zone_blacklist_count = 0; |
47 | 47 | ||
48 | static struct buddy_system_operations zone_buddy_system_operations = { |
48 | static struct buddy_system_operations zone_buddy_system_operations = { |
49 | .find_buddy = zone_buddy_find_buddy, |
49 | .find_buddy = zone_buddy_find_buddy, |
50 | .bisect = zone_buddy_bisect, |
50 | .bisect = zone_buddy_bisect, |
51 | .coalesce = zone_buddy_coalesce, |
51 | .coalesce = zone_buddy_coalesce, |
52 | .set_order = zone_buddy_set_order, |
52 | .set_order = zone_buddy_set_order, |
53 | .get_order = zone_buddy_get_order, |
53 | .get_order = zone_buddy_get_order, |
54 | .mark_busy = zone_buddy_mark_busy, |
54 | .mark_busy = zone_buddy_mark_busy, |
55 | }; |
55 | }; |
56 | 56 | ||
57 | /** Initialize physical memory management |
57 | /** Initialize physical memory management |
58 | * |
58 | * |
59 | * Initialize physical memory managemnt. |
59 | * Initialize physical memory managemnt. |
60 | */ |
60 | */ |
61 | void frame_init(void) |
61 | void frame_init(void) |
62 | { |
62 | { |
63 | if (config.cpu_active == 1) { |
63 | if (config.cpu_active == 1) { |
64 | zone_init(); |
64 | zone_init(); |
65 | frame_region_not_free(config.base, config.base + config.kernel_size + CONFIG_STACK_SIZE); |
65 | frame_region_not_free(config.base, config.base + config.kernel_size + CONFIG_STACK_SIZE); |
66 | } |
66 | } |
67 | 67 | ||
68 | frame_arch_init(); |
68 | frame_arch_init(); |
69 | } |
69 | } |
70 | 70 | ||
71 | /** Allocate a frame |
71 | /** Allocate a frame |
72 | * |
72 | * |
73 | * Allocate a frame of physical memory. |
73 | * Allocate a frame of physical memory. |
74 | * |
74 | * |
75 | * @param flags Flags for host zone selection and address processing. |
75 | * @param flags Flags for host zone selection and address processing. |
76 | * |
76 | * |
77 | * @return Allocated frame. |
77 | * @return Allocated frame. |
78 | */ |
78 | */ |
79 | __address frame_alloc(int flags, __u8 order) |
79 | __address frame_alloc(int flags, __u8 order) |
80 | { |
80 | { |
81 | ipl_t ipl; |
81 | ipl_t ipl; |
82 | link_t *cur, *tmp; |
82 | link_t *cur, *tmp; |
83 | zone_t *z; |
83 | zone_t *z; |
84 | zone_t *zone = NULL; |
84 | zone_t *zone = NULL; |
85 | frame_t *frame = NULL; |
85 | frame_t *frame = NULL; |
86 | __address v; |
86 | __address v; |
87 | 87 | ||
88 | loop: |
88 | loop: |
89 | ipl = interrupts_disable(); |
89 | ipl = interrupts_disable(); |
90 | spinlock_lock(&zone_head_lock); |
90 | spinlock_lock(&zone_head_lock); |
91 | 91 | ||
92 | /* |
92 | /* |
93 | * First, find suitable frame zone. |
93 | * First, find suitable frame zone. |
94 | */ |
94 | */ |
95 | for (cur = zone_head.next; cur != &zone_head; cur = cur->next) { |
95 | for (cur = zone_head.next; cur != &zone_head; cur = cur->next) { |
96 | z = list_get_instance(cur, zone_t, link); |
96 | z = list_get_instance(cur, zone_t, link); |
97 | 97 | ||
98 | spinlock_lock(&z->lock); |
98 | spinlock_lock(&z->lock); |
99 | 99 | ||
100 | /* Check if the zone has 2^order frames area available */ |
100 | /* Check if the zone has 2^order frames area available */ |
101 | if (buddy_system_can_alloc(z->buddy_system, order)) { |
101 | if (buddy_system_can_alloc(z->buddy_system, order)) { |
102 | zone = z; |
102 | zone = z; |
103 | break; |
103 | break; |
104 | } |
104 | } |
105 | 105 | ||
106 | spinlock_unlock(&z->lock); |
106 | spinlock_unlock(&z->lock); |
107 | } |
107 | } |
108 | 108 | ||
109 | if (!zone) { |
109 | if (!zone) { |
110 | if (flags & FRAME_PANIC) |
110 | if (flags & FRAME_PANIC) |
111 | panic("Can't allocate frame.\n"); |
111 | panic("Can't allocate frame.\n"); |
112 | 112 | ||
113 | /* |
113 | /* |
114 | * TODO: Sleep until frames are available again. |
114 | * TODO: Sleep until frames are available again. |
115 | */ |
115 | */ |
116 | spinlock_unlock(&zone_head_lock); |
116 | spinlock_unlock(&zone_head_lock); |
117 | interrupts_restore(ipl); |
117 | interrupts_restore(ipl); |
118 | 118 | ||
119 | panic("Sleep not implemented.\n"); |
119 | panic("Sleep not implemented.\n"); |
120 | goto loop; |
120 | goto loop; |
121 | } |
121 | } |
122 | 122 | ||
123 | 123 | ||
124 | /* Allocate frames from zone buddy system */ |
124 | /* Allocate frames from zone buddy system */ |
125 | cur = buddy_system_alloc(zone->buddy_system, order); |
125 | cur = buddy_system_alloc(zone->buddy_system, order); |
126 | 126 | ||
127 | /* frame will be actually a first frame of the block */ |
127 | /* frame will be actually a first frame of the block */ |
128 | frame = list_get_instance(cur, frame_t, buddy_link); |
128 | frame = list_get_instance(cur, frame_t, buddy_link); |
129 | 129 | ||
130 | /* get frame address */ |
130 | /* get frame address */ |
131 | v = FRAME2ADDR(zone, frame); |
131 | v = FRAME2ADDR(zone, frame); |
132 | 132 | ||
133 | if (flags & FRAME_KA) |
133 | if (flags & FRAME_KA) |
134 | v = PA2KA(v); |
134 | v = PA2KA(v); |
135 | 135 | ||
136 | spinlock_unlock(&zone->lock); |
136 | spinlock_unlock(&zone->lock); |
137 | spinlock_unlock(&zone_head_lock); |
137 | spinlock_unlock(&zone_head_lock); |
138 | interrupts_restore(ipl); |
138 | interrupts_restore(ipl); |
139 | return v; |
139 | return v; |
140 | 140 | ||
141 | } |
141 | } |
142 | 142 | ||
143 | /** Free a frame. |
143 | /** Free a frame. |
144 | * |
144 | * |
145 | * Find respective frame structrue for supplied addr. |
145 | * Find respective frame structrue for supplied addr. |
146 | * Decrement frame reference count. |
146 | * Decrement frame reference count. |
147 | * If it drops to zero, move the frame structure to free list. |
147 | * If it drops to zero, move the frame structure to free list. |
148 | * |
148 | * |
149 | * @param addr Address of the frame to be freed. It must be a multiple of FRAME_SIZE. |
149 | * @param addr Address of the frame to be freed. It must be a multiple of FRAME_SIZE. |
150 | */ |
150 | */ |
151 | void frame_free(__address addr) |
151 | void frame_free(__address addr) |
152 | { |
152 | { |
153 | ipl_t ipl; |
153 | ipl_t ipl; |
154 | link_t *cur; |
154 | link_t *cur; |
155 | zone_t *z; |
155 | zone_t *z; |
156 | zone_t *zone = NULL; |
156 | zone_t *zone = NULL; |
157 | frame_t *frame; |
157 | frame_t *frame; |
158 | ASSERT(addr % FRAME_SIZE == 0); |
158 | ASSERT(addr % FRAME_SIZE == 0); |
159 | 159 | ||
160 | ipl = interrupts_disable(); |
160 | ipl = interrupts_disable(); |
161 | spinlock_lock(&zone_head_lock); |
161 | spinlock_lock(&zone_head_lock); |
162 | 162 | ||
163 | /* |
163 | /* |
164 | * First, find host frame zone for addr. |
164 | * First, find host frame zone for addr. |
165 | */ |
165 | */ |
166 | for (cur = zone_head.next; cur != &zone_head; cur = cur->next) { |
166 | for (cur = zone_head.next; cur != &zone_head; cur = cur->next) { |
167 | z = list_get_instance(cur, zone_t, link); |
167 | z = list_get_instance(cur, zone_t, link); |
168 | 168 | ||
169 | spinlock_lock(&z->lock); |
169 | spinlock_lock(&z->lock); |
170 | 170 | ||
171 | if (IS_KA(addr)) |
171 | if (IS_KA(addr)) |
172 | addr = KA2PA(addr); |
172 | addr = KA2PA(addr); |
173 | 173 | ||
174 | /* |
174 | /* |
175 | * Check if addr belongs to z. |
175 | * Check if addr belongs to z. |
176 | */ |
176 | */ |
177 | if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) { |
177 | if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) { |
178 | zone = z; |
178 | zone = z; |
179 | break; |
179 | break; |
180 | } |
180 | } |
181 | spinlock_unlock(&z->lock); |
181 | spinlock_unlock(&z->lock); |
182 | } |
182 | } |
183 | 183 | ||
184 | ASSERT(zone != NULL); |
184 | ASSERT(zone != NULL); |
185 | 185 | ||
186 | frame = ADDR2FRAME(zone, addr); |
186 | frame = ADDR2FRAME(zone, addr); |
187 | 187 | ||
188 | ASSERT(frame->refcount); |
188 | ASSERT(frame->refcount); |
189 | 189 | ||
190 | if (!--frame->refcount) { |
190 | if (!--frame->refcount) { |
191 | buddy_system_free(zone->buddy_system, &frame->buddy_link); |
191 | buddy_system_free(zone->buddy_system, &frame->buddy_link); |
192 | } |
192 | } |
193 | 193 | ||
194 | spinlock_unlock(&zone->lock); |
194 | spinlock_unlock(&zone->lock); |
195 | 195 | ||
196 | spinlock_unlock(&zone_head_lock); |
196 | spinlock_unlock(&zone_head_lock); |
197 | interrupts_restore(ipl); |
197 | interrupts_restore(ipl); |
198 | } |
198 | } |
199 | 199 | ||
200 | /** Mark frame region not free. |
200 | /** Mark frame region not free. |
201 | * |
201 | * |
202 | * Mark frame region not free. |
202 | * Mark frame region not free. |
203 | * |
203 | * |
204 | * @param start First address. |
204 | * @param start First address. |
205 | * @param stop Last address. |
205 | * @param stop Last address. |
206 | */ |
206 | */ |
207 | void frame_region_not_free(__address base, size_t size) |
207 | void frame_region_not_free(__address base, size_t size) |
208 | { |
208 | { |
209 | count_t index; |
209 | count_t index; |
210 | index = zone_blacklist_count++; |
210 | index = zone_blacklist_count++; |
211 | ASSERT(base % FRAME_SIZE == 0); |
211 | ASSERT(base % FRAME_SIZE == 0); |
212 | 212 | ||
213 | if (size % FRAME_SIZE != 0) { |
213 | if (size % FRAME_SIZE != 0) { |
214 | size = size + (FRAME_SIZE - size % FRAME_SIZE); |
214 | size = size + (FRAME_SIZE - size % FRAME_SIZE); |
215 | } |
215 | } |
216 | ASSERT(size % FRAME_SIZE == 0); |
216 | ASSERT(size % FRAME_SIZE == 0); |
217 | ASSERT(zone_blacklist_count <= ZONE_BLACKLIST_SIZE); |
217 | ASSERT(zone_blacklist_count <= ZONE_BLACKLIST_SIZE); |
218 | zone_blacklist[index].base = base; |
218 | zone_blacklist[index].base = base; |
219 | zone_blacklist[index].size = size; |
219 | zone_blacklist[index].size = size; |
220 | } |
220 | } |
221 | 221 | ||
222 | 222 | ||
223 | /** Initialize zonekeeping |
223 | /** Initialize zonekeeping |
224 | * |
224 | * |
225 | * Initialize zonekeeping. |
225 | * Initialize zonekeeping. |
226 | */ |
226 | */ |
227 | void zone_init(void) |
227 | void zone_init(void) |
228 | { |
228 | { |
229 | spinlock_initialize(&zone_head_lock); |
229 | spinlock_initialize(&zone_head_lock); |
230 | list_initialize(&zone_head); |
230 | list_initialize(&zone_head); |
231 | } |
231 | } |
232 | 232 | ||
233 | 233 | ||
234 | void zone_create_in_region(__address base, size_t size) { |
234 | void zone_create_in_region(__address base, size_t size) { |
235 | int i; |
235 | int i; |
236 | zone_t * z; |
236 | zone_t * z; |
237 | __address s; size_t sz; |
237 | __address s; size_t sz; |
238 | 238 | ||
239 | ASSERT(base % FRAME_SIZE == 0); |
239 | ASSERT(base % FRAME_SIZE == 0); |
240 | ASSERT(size % FRAME_SIZE == 0); |
240 | ASSERT(size % FRAME_SIZE == 0); |
241 | 241 | ||
242 | if (!size) return; |
242 | if (!size) return; |
243 | 243 | ||
244 | for (i = 0; i < zone_blacklist_count; i++) { |
244 | for (i = 0; i < zone_blacklist_count; i++) { |
245 | if (zone_blacklist[i].base >= base && zone_blacklist[i].base < base + size) { |
245 | if (zone_blacklist[i].base >= base && zone_blacklist[i].base < base + size) { |
246 | s = base; sz = zone_blacklist[i].base - base; |
246 | s = base; sz = zone_blacklist[i].base - base; |
247 | ASSERT(base != s || sz != size); |
247 | ASSERT(base != s || sz != size); |
248 | zone_create_in_region(s, sz); |
248 | zone_create_in_region(s, sz); |
249 | 249 | ||
250 | s = zone_blacklist[i].base + zone_blacklist[i].size; |
250 | s = zone_blacklist[i].base + zone_blacklist[i].size; |
251 | sz = (base + size) - (zone_blacklist[i].base + zone_blacklist[i].size); |
251 | sz = (base + size) - (zone_blacklist[i].base + zone_blacklist[i].size); |
252 | ASSERT(base != s || sz != size); |
252 | ASSERT(base != s || sz != size); |
253 | zone_create_in_region(s, sz); |
253 | zone_create_in_region(s, sz); |
254 | return; |
254 | return; |
255 | 255 | ||
256 | } |
256 | } |
257 | } |
257 | } |
258 | 258 | ||
259 | z = zone_create(base, size, 0); |
259 | z = zone_create(base, size, 0); |
260 | 260 | ||
261 | if (!z) { |
261 | if (!z) { |
262 | panic("Cannot allocate zone (%dB).\n", size); |
262 | panic("Cannot allocate zone (%dB).\n", size); |
263 | } |
263 | } |
264 | 264 | ||
265 | zone_attach(z); |
265 | zone_attach(z); |
266 | } |
266 | } |
267 | 267 | ||
268 | 268 | ||
269 | 269 | ||
270 | /** Create frame zone |
270 | /** Create frame zone |
271 | * |
271 | * |
272 | * Create new frame zone. |
272 | * Create new frame zone. |
273 | * |
273 | * |
274 | * @param start Physical address of the first frame within the zone. |
274 | * @param start Physical address of the first frame within the zone. |
275 | * @param size Size of the zone. Must be a multiple of FRAME_SIZE. |
275 | * @param size Size of the zone. Must be a multiple of FRAME_SIZE. |
276 | * @param flags Zone flags. |
276 | * @param flags Zone flags. |
277 | * |
277 | * |
278 | * @return Initialized zone. |
278 | * @return Initialized zone. |
279 | */ |
279 | */ |
280 | zone_t * zone_create(__address start, size_t size, int flags) |
280 | zone_t * zone_create(__address start, size_t size, int flags) |
281 | { |
281 | { |
282 | zone_t *z; |
282 | zone_t *z; |
283 | count_t cnt; |
283 | count_t cnt; |
284 | int i; |
284 | int i; |
285 | __u8 max_order; |
285 | __u8 max_order; |
286 | 286 | ||
287 | /* hack for bug #10 */ |
287 | /* hack for bug #10 */ |
288 | // if (start == 0x100000) size -= (FRAME_SIZE * 256); |
288 | // if (start == 0x100000) size -= (FRAME_SIZE * 256); |
289 | 289 | ||
290 | // printf("ZONE_CREATE() %X - %X (%d kbytes) \n", start, start+size, size/1024); |
290 | // printf("ZONE_CREATE() %X - %X (%d kbytes) \n", start, start+size, size/1024); |
291 | ASSERT(start % FRAME_SIZE == 0); |
291 | ASSERT(start % FRAME_SIZE == 0); |
292 | ASSERT(size % FRAME_SIZE == 0); |
292 | ASSERT(size % FRAME_SIZE == 0); |
293 | 293 | ||
294 | cnt = size / FRAME_SIZE; |
294 | cnt = size / FRAME_SIZE; |
295 | 295 | ||
296 | z = (zone_t *) early_malloc(sizeof(zone_t)); |
296 | z = (zone_t *) early_malloc(sizeof(zone_t)); |
297 | if (z) { |
297 | if (z) { |
298 | link_initialize(&z->link); |
298 | link_initialize(&z->link); |
299 | spinlock_initialize(&z->lock); |
299 | spinlock_initialize(&z->lock); |
300 | 300 | ||
301 | z->base = start; |
301 | z->base = start; |
302 | z->flags = flags; |
302 | z->flags = flags; |
303 | 303 | ||
304 | z->free_count = cnt; |
304 | z->free_count = cnt; |
305 | list_initialize(&z->free_head); |
305 | list_initialize(&z->free_head); |
306 | 306 | ||
307 | z->busy_count = 0; |
307 | z->busy_count = 0; |
308 | 308 | ||
309 | z->frames = (frame_t *) early_malloc(cnt * sizeof(frame_t)); |
309 | z->frames = (frame_t *) early_malloc(cnt * sizeof(frame_t)); |
310 | if (!z->frames) { |
310 | if (!z->frames) { |
311 | early_free(z); |
311 | early_free(z); |
312 | return NULL; |
312 | return NULL; |
313 | } |
313 | } |
314 | 314 | ||
315 | for (i = 0; i<cnt; i++) { |
315 | for (i = 0; i<cnt; i++) { |
316 | frame_initialize(&z->frames[i], z); |
316 | frame_initialize(&z->frames[i], z); |
317 | list_append(&z->frames[i].link, &z->free_head); |
317 | list_append(&z->frames[i].link, &z->free_head); |
318 | } |
318 | } |
319 | 319 | ||
320 | /* |
320 | /* |
321 | * Create buddy system for the zone |
321 | * Create buddy system for the zone |
322 | */ |
322 | */ |
323 | for (max_order = 0; cnt >> max_order; max_order++); |
323 | for (max_order = 0; cnt >> max_order; max_order++); |
324 | z->buddy_system = buddy_system_create(max_order, &zone_buddy_system_operations, (void *) z); |
324 | z->buddy_system = buddy_system_create(max_order, &zone_buddy_system_operations, (void *) z); |
325 | 325 | ||
326 | /* Stuffing frames */ |
326 | /* Stuffing frames */ |
327 | for (i = 0; i<cnt; i++) { |
327 | for (i = 0; i<cnt; i++) { |
328 | z->frames[i].refcount = 0; |
328 | z->frames[i].refcount = 0; |
329 | buddy_system_free(z->buddy_system, &z->frames[i].buddy_link); |
329 | buddy_system_free(z->buddy_system, &z->frames[i].buddy_link); |
330 | } |
330 | } |
331 | } |
331 | } |
332 | return z; |
332 | return z; |
333 | } |
333 | } |
334 | 334 | ||
335 | /** Attach frame zone |
335 | /** Attach frame zone |
336 | * |
336 | * |
337 | * Attach frame zone to zone list. |
337 | * Attach frame zone to zone list. |
338 | * |
338 | * |
339 | * @param zone Zone to be attached. |
339 | * @param zone Zone to be attached. |
340 | */ |
340 | */ |
341 | void zone_attach(zone_t *zone) |
341 | void zone_attach(zone_t *zone) |
342 | { |
342 | { |
343 | ipl_t ipl; |
343 | ipl_t ipl; |
344 | 344 | ||
345 | ipl = interrupts_disable(); |
345 | ipl = interrupts_disable(); |
346 | spinlock_lock(&zone_head_lock); |
346 | spinlock_lock(&zone_head_lock); |
347 | 347 | ||
348 | list_append(&zone->link, &zone_head); |
348 | list_append(&zone->link, &zone_head); |
349 | 349 | ||
350 | spinlock_unlock(&zone_head_lock); |
350 | spinlock_unlock(&zone_head_lock); |
351 | interrupts_restore(ipl); |
351 | interrupts_restore(ipl); |
352 | } |
352 | } |
353 | 353 | ||
354 | /** Initialize frame structure |
354 | /** Initialize frame structure |
355 | * |
355 | * |
356 | * Initialize frame structure. |
356 | * Initialize frame structure. |
357 | * |
357 | * |
358 | * @param frame Frame structure to be initialized. |
358 | * @param frame Frame structure to be initialized. |
359 | * @param zone Host frame zone. |
359 | * @param zone Host frame zone. |
360 | */ |
360 | */ |
361 | void frame_initialize(frame_t *frame, zone_t *zone) |
361 | void frame_initialize(frame_t *frame, zone_t *zone) |
362 | { |
362 | { |
363 | frame->refcount = 1; |
363 | frame->refcount = 1; |
364 | frame->buddy_order = 0; |
364 | frame->buddy_order = 0; |
365 | link_initialize(&frame->link); |
365 | link_initialize(&frame->link); |
366 | } |
366 | } |
367 | 367 | ||
368 | 368 | ||
369 | /** Buddy system find_buddy implementation |
369 | /** Buddy system find_buddy implementation |
370 | * |
370 | * |
371 | * @param b Buddy system. |
371 | * @param b Buddy system. |
372 | * @param block Block for which buddy should be found |
372 | * @param block Block for which buddy should be found |
373 | * |
373 | * |
374 | * @return Buddy for given block if found |
374 | * @return Buddy for given block if found |
375 | */ |
375 | */ |
376 | link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * block) { |
376 | link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * block) { |
377 | frame_t * frame, * f; |
377 | frame_t * frame, * f; |
378 | zone_t * zone; |
378 | zone_t * zone; |
379 | link_t * cur; |
379 | link_t * cur; |
380 | count_t index; |
380 | count_t index; |
381 | bool is_left, is_right; |
381 | bool is_left, is_right; |
382 | 382 | ||
383 | frame = list_get_instance(block, frame_t, buddy_link); |
383 | frame = list_get_instance(block, frame_t, buddy_link); |
384 | zone = (zone_t *) b->data; |
384 | zone = (zone_t *) b->data; |
385 | 385 | ||
386 | /* |
386 | /* |
387 | * (FRAME_INDEX % 2^(ORDER+1)) == 0 ===> LEFT BUDDY |
387 | * (FRAME_INDEX % 2^(ORDER+1)) == 0 ===> LEFT BUDDY |
388 | * (FRAME_INDEX % 2^(ORDER+1)) == 2^(ORDER) ===> RIGHT BUDDY |
388 | * (FRAME_INDEX % 2^(ORDER+1)) == 2^(ORDER) ===> RIGHT BUDDY |
389 | */ |
389 | */ |
390 | 390 | ||
391 | is_left = IS_BUDDY_LEFT_BLOCK(zone, frame); |
391 | is_left = IS_BUDDY_LEFT_BLOCK(zone, frame); |
392 | is_right = IS_BUDDY_RIGHT_BLOCK(zone, frame); |
392 | is_right = IS_BUDDY_RIGHT_BLOCK(zone, frame); |
393 | 393 | ||
394 | ASSERT((is_left || is_right) && (!is_left || !is_right)); |
394 | ASSERT((is_left || is_right) && (!is_left || !is_right)); |
395 | 395 | ||
396 | /* |
396 | /* |
397 | * test left buddy |
397 | * test left buddy |
398 | */ |
398 | */ |
399 | if (is_left) { |
399 | if (is_left) { |
400 | index = (FRAME_INDEX(zone, frame)) + (1 << frame->buddy_order); |
400 | index = (FRAME_INDEX(zone, frame)) + (1 << frame->buddy_order); |
401 | } else if (is_right) { |
401 | } else if (is_right) { |
402 | index = (FRAME_INDEX(zone, frame)) - (1 << frame->buddy_order); |
402 | index = (FRAME_INDEX(zone, frame)) - (1 << frame->buddy_order); |
403 | } |
403 | } |
404 | 404 | ||
405 | if (FRAME_INDEX_VALID(zone, index)) { |
405 | if (FRAME_INDEX_VALID(zone, index)) { |
406 | if ( zone->frames[index].buddy_order == frame->buddy_order && |
406 | if ( zone->frames[index].buddy_order == frame->buddy_order && |
407 | zone->frames[index].refcount == 0) { |
407 | zone->frames[index].refcount == 0) { |
408 | return &zone->frames[index].buddy_link; |
408 | return &zone->frames[index].buddy_link; |
409 | } |
409 | } |
410 | } |
410 | } |
411 | 411 | ||
412 | return NULL; |
412 | return NULL; |
413 | 413 | ||
414 | } |
414 | } |
415 | 415 | ||
416 | /** Buddy system bisect implementation |
416 | /** Buddy system bisect implementation |
417 | * |
417 | * |
418 | * @param b Buddy system. |
418 | * @param b Buddy system. |
419 | * @param block Block to bisect |
419 | * @param block Block to bisect |
420 | * |
420 | * |
421 | * @return right block |
421 | * @return right block |
422 | */ |
422 | */ |
423 | link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block) { |
423 | link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block) { |
424 | frame_t * frame_l, * frame_r; |
424 | frame_t * frame_l, * frame_r; |
425 | frame_l = list_get_instance(block, frame_t, buddy_link); |
425 | frame_l = list_get_instance(block, frame_t, buddy_link); |
426 | frame_r = (frame_l + (1 << (frame_l->buddy_order - 1))); |
426 | frame_r = (frame_l + (1 << (frame_l->buddy_order - 1))); |
427 | return &frame_r->buddy_link; |
427 | return &frame_r->buddy_link; |
428 | } |
428 | } |
429 | 429 | ||
430 | /** Buddy system coalesce implementation |
430 | /** Buddy system coalesce implementation |
431 | * |
431 | * |
432 | * @param b Buddy system. |
432 | * @param b Buddy system. |
433 | * @param block_1 First block |
433 | * @param block_1 First block |
434 | * @param block_2 First block's buddy |
434 | * @param block_2 First block's buddy |
435 | * |
435 | * |
436 | * @return Coalesced block (actually block that represents lower address) |
436 | * @return Coalesced block (actually block that represents lower address) |
437 | */ |
437 | */ |
438 | link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * block_1, link_t * block_2) { |
438 | link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * block_1, link_t * block_2) { |
439 | frame_t * frame1, * frame2; |
439 | frame_t * frame1, * frame2; |
440 | frame1 = list_get_instance(block_1, frame_t, buddy_link); |
440 | frame1 = list_get_instance(block_1, frame_t, buddy_link); |
441 | frame2 = list_get_instance(block_2, frame_t, buddy_link); |
441 | frame2 = list_get_instance(block_2, frame_t, buddy_link); |
442 | return frame1 < frame2 ? block_1 : block_2; |
442 | return frame1 < frame2 ? block_1 : block_2; |
443 | } |
443 | } |
444 | 444 | ||
445 | /** Buddy system set_order implementation |
445 | /** Buddy system set_order implementation |
446 | * |
446 | * |
447 | * @param b Buddy system. |
447 | * @param b Buddy system. |
448 | * @param block Buddy system block |
448 | * @param block Buddy system block |
449 | * @param order Order to set |
449 | * @param order Order to set |
450 | */ |
450 | */ |
451 | void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order) { |
451 | void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order) { |
452 | frame_t * frame; |
452 | frame_t * frame; |
453 | frame = list_get_instance(block, frame_t, buddy_link); |
453 | frame = list_get_instance(block, frame_t, buddy_link); |
454 | frame->buddy_order = order; |
454 | frame->buddy_order = order; |
455 | } |
455 | } |
456 | 456 | ||
457 | /** Buddy system get_order implementation |
457 | /** Buddy system get_order implementation |
458 | * |
458 | * |
459 | * @param b Buddy system. |
459 | * @param b Buddy system. |
460 | * @param block Buddy system block |
460 | * @param block Buddy system block |
461 | * |
461 | * |
462 | * @return Order of block |
462 | * @return Order of block |
463 | */ |
463 | */ |
464 | __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block) { |
464 | __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block) { |
465 | frame_t * frame; |
465 | frame_t * frame; |
466 | frame = list_get_instance(block, frame_t, buddy_link); |
466 | frame = list_get_instance(block, frame_t, buddy_link); |
467 | return frame->buddy_order; |
467 | return frame->buddy_order; |
468 | } |
468 | } |
469 | 469 | ||
470 | /** Buddy system mark_busy implementation |
470 | /** Buddy system mark_busy implementation |
471 | * |
471 | * |
472 | * @param b Buddy system |
472 | * @param b Buddy system |
473 | * @param block Buddy system block |
473 | * @param block Buddy system block |
474 | * |
474 | * |
475 | */ |
475 | */ |
476 | void zone_buddy_mark_busy(buddy_system_t *b, link_t * block) { |
476 | void zone_buddy_mark_busy(buddy_system_t *b, link_t * block) { |
477 | frame_t * frame; |
477 | frame_t * frame; |
478 | frame = list_get_instance(block, frame_t, buddy_link); |
478 | frame = list_get_instance(block, frame_t, buddy_link); |
479 | frame->refcount = 1; |
479 | frame->refcount = 1; |
480 | } |
480 | } |
481 | 481 |