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1 jermar 1
/*
2
 * Copyright (C) 2001-2004 Jakub Jermar
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
368 jermar 29
#include <typedefs.h>
1 jermar 30
#include <arch/types.h>
31
#include <mm/heap.h>
32
#include <mm/frame.h>
33
#include <mm/vm.h>
34
#include <panic.h>
367 jermar 35
#include <debug.h>
368 jermar 36
#include <list.h>
1 jermar 37
#include <synch/spinlock.h>
115 jermar 38
#include <arch/asm.h>
195 vana 39
#include <arch.h>
115 jermar 40
 
367 jermar 41
spinlock_t zone_head_lock;       /**< this lock protects zone_head list */
42
link_t zone_head;                /**< list of all zones in the system */
43
 
479 bondari 44
static struct buddy_system_operations  zone_buddy_system_operations = {
45
    .find_buddy = zone_buddy_find_buddy,
46
    .bisect = zone_buddy_bisect,
47
    .coalesce = zone_buddy_coalesce,
48
    .set_order = zone_buddy_set_order,
49
    .get_order = zone_buddy_get_order,
50
};
51
 
368 jermar 52
/** Initialize physical memory management
53
 *
54
 * Initialize physical memory managemnt.
55
 */
1 jermar 56
void frame_init(void)
57
{
125 jermar 58
    if (config.cpu_active == 1) {
367 jermar 59
        zone_init();
1 jermar 60
    }
61
 
62
    frame_arch_init();
368 jermar 63
 
1 jermar 64
    if (config.cpu_active == 1) {
368 jermar 65
                frame_region_not_free(config.base, config.base + config.kernel_size + CONFIG_STACK_SIZE);
66
        }  
1 jermar 67
}
68
 
368 jermar 69
/** Allocate a frame
70
 *
71
 * Allocate a frame of physical memory.
72
 *
73
 * @param flags Flags for host zone selection and address processing.
74
 *
75
 * @return Allocated frame.
1 jermar 76
 */
77
__address frame_alloc(int flags)
78
{
413 jermar 79
    ipl_t ipl;
368 jermar 80
    link_t *cur, *tmp;
81
    zone_t *z;
82
    zone_t *zone = NULL;
83
    frame_t *frame = NULL;
84
    __address v;
1 jermar 85
 
86
loop:
413 jermar 87
    ipl = interrupts_disable();
368 jermar 88
    spinlock_lock(&zone_head_lock);
89
 
90
    /*
91
     * First, find suitable frame zone.
92
     */
93
    for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
94
        z = list_get_instance(cur, zone_t, link);
1 jermar 95
 
368 jermar 96
        spinlock_lock(&z->lock);
97
        /*
98
         * Check if the zone has any free frames.
99
         */
100
        if (z->free_count) {
101
            zone = z;
102
            break;
1 jermar 103
        }
368 jermar 104
        spinlock_unlock(&z->lock);
1 jermar 105
    }
368 jermar 106
 
107
    if (!zone) {
108
        if (flags & FRAME_PANIC)
109
            panic("Can't allocate frame.\n");
110
 
111
        /*
112
         * TODO: Sleep until frames are available again.
113
         */
114
        spinlock_unlock(&zone_head_lock);
413 jermar 115
        interrupts_restore(ipl);
1 jermar 116
 
368 jermar 117
        panic("Sleep not implemented.\n");
118
        goto loop;
119
    }
1 jermar 120
 
368 jermar 121
    tmp = zone->free_head.next;
122
    frame = list_get_instance(tmp, frame_t, link);
123
 
124
    frame->refcount++;
125
    list_remove(tmp);           /* remove frame from free_head */
126
    zone->free_count--;
127
    zone->busy_count++;
1 jermar 128
 
479 bondari 129
    //v = zone->base + (frame - zone->frames) * FRAME_SIZE;
130
    v = FRAME2ADDR(zone, frame);
368 jermar 131
 
132
    if (flags & FRAME_KA)
133
        v = PA2KA(v);
134
 
135
    spinlock_unlock(&zone->lock);
136
 
137
    spinlock_unlock(&zone_head_lock);
413 jermar 138
    interrupts_restore(ipl);
368 jermar 139
 
140
    return v;
1 jermar 141
}
142
 
368 jermar 143
/** Free a frame.
144
 *
145
 * Find respective frame structrue for supplied addr.
146
 * Decrement frame reference count.
147
 * If it drops to zero, move the frame structure to free list.
148
 *
149
 * @param addr Address of the frame to be freed. It must be a multiple of FRAME_SIZE.
1 jermar 150
 */
151
void frame_free(__address addr)
152
{
413 jermar 153
    ipl_t ipl;
368 jermar 154
    link_t *cur;
155
    zone_t *z;
156
    zone_t *zone = NULL;
157
    frame_t *frame;
1 jermar 158
 
368 jermar 159
    ASSERT(addr % FRAME_SIZE == 0);
1 jermar 160
 
413 jermar 161
    ipl = interrupts_disable();
368 jermar 162
    spinlock_lock(&zone_head_lock);
1 jermar 163
 
368 jermar 164
    /*
165
     * First, find host frame zone for addr.
166
     */
167
    for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
168
        z = list_get_instance(cur, zone_t, link);
169
 
170
        spinlock_lock(&z->lock);
171
 
172
        if (IS_KA(addr))
173
            addr = KA2PA(addr);
174
 
175
        /*
176
         * Check if addr belongs to z.
177
         */
178
        if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) {
179
            zone = z;
180
            break;
1 jermar 181
        }
368 jermar 182
        spinlock_unlock(&z->lock);
1 jermar 183
    }
184
 
368 jermar 185
    ASSERT(zone != NULL);
186
 
479 bondari 187
    frame = ADDR2FRAME(zone, addr);
188
    // frame = &zone->frames[(addr - zone->base)/FRAME_SIZE];
368 jermar 189
    ASSERT(frame->refcount);
190
 
191
    if (!--frame->refcount) {
192
        list_append(&frame->link, &zone->free_head);    /* append frame to free_head */
193
        zone->free_count++;
194
        zone->busy_count--;
195
    }
196
 
197
    spinlock_unlock(&zone->lock);  
198
 
199
    spinlock_unlock(&zone_head_lock);
413 jermar 200
    interrupts_restore(ipl);
1 jermar 201
}
202
 
368 jermar 203
/** Mark frame not free.
204
 *
205
 * Find respective frame structrue for supplied addr.
373 jermar 206
 * Increment frame reference count and remove the frame structure from free list.
368 jermar 207
 *
208
 * @param addr Address of the frame to be marked. It must be a multiple of FRAME_SIZE.
1 jermar 209
 */
210
void frame_not_free(__address addr)
211
{
413 jermar 212
    ipl_t ipl;
368 jermar 213
    link_t *cur;
214
    zone_t *z;
215
    zone_t *zone = NULL;
216
    frame_t *frame;
1 jermar 217
 
368 jermar 218
    ASSERT(addr % FRAME_SIZE == 0);
219
 
413 jermar 220
    ipl = interrupts_disable();
368 jermar 221
    spinlock_lock(&zone_head_lock);
1 jermar 222
 
368 jermar 223
    /*
224
     * First, find host frame zone for addr.
225
     */
226
    for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
227
        z = list_get_instance(cur, zone_t, link);
228
 
229
        spinlock_lock(&z->lock);
230
 
231
        if (IS_KA(addr))
232
            addr = KA2PA(addr);
233
 
234
        /*
235
         * Check if addr belongs to z.
236
         */
237
        if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) {
238
            zone = z;
239
            break;
1 jermar 240
        }
368 jermar 241
        spinlock_unlock(&z->lock);
1 jermar 242
    }
368 jermar 243
 
244
    ASSERT(zone != NULL);
245
 
479 bondari 246
    //frame = &zone->frames[(addr - zone->base)/FRAME_SIZE];
247
    frame = ADDR2FRAME(zone, addr);
368 jermar 248
 
249
    if (!frame->refcount) {
250
        frame->refcount++;
251
 
252
        list_remove(&frame->link);          /* remove frame from free_head */
253
        zone->free_count--;
254
        zone->busy_count++;
255
    }
256
 
257
    spinlock_unlock(&zone->lock);  
258
 
259
    spinlock_unlock(&zone_head_lock);
413 jermar 260
    interrupts_restore(ipl);
1 jermar 261
}
262
 
368 jermar 263
/** Mark frame region not free.
264
 *
265
 * Mark frame region not free.
266
 *
267
 * @param start First address.
268
 * @param stop Last address.
269
 */
1 jermar 270
void frame_region_not_free(__address start, __address stop)
271
{
368 jermar 272
        __address a;
1 jermar 273
 
368 jermar 274
        start /= FRAME_SIZE;
275
        stop /= FRAME_SIZE;
276
        for (a = start; a <= stop; a++)
277
                frame_not_free(a * FRAME_SIZE);
1 jermar 278
}
367 jermar 279
 
368 jermar 280
 
367 jermar 281
/** Initialize zonekeeping
282
 *
283
 * Initialize zonekeeping.
284
 */
285
void zone_init(void)
286
{
287
    spinlock_initialize(&zone_head_lock);
288
    list_initialize(&zone_head);
289
}
290
 
291
/** Create frame zone
292
 *
293
 * Create new frame zone.
294
 *
295
 * @param start Physical address of the first frame within the zone.
296
 * @param size Size of the zone. Must be a multiple of FRAME_SIZE.
297
 * @param flags Zone flags.
298
 *
299
 * @return Initialized zone.
300
 */
301
zone_t *zone_create(__address start, size_t size, int flags)
302
{
303
    zone_t *z;
304
    count_t cnt;
305
    int i;
479 bondari 306
    __u8 max_order;
367 jermar 307
 
308
    ASSERT(start % FRAME_SIZE == 0);
309
    ASSERT(size % FRAME_SIZE == 0);
310
 
311
    cnt = size / FRAME_SIZE;
312
 
374 jermar 313
    z = (zone_t *) early_malloc(sizeof(zone_t));
367 jermar 314
    if (z) {
315
        link_initialize(&z->link);
316
        spinlock_initialize(&z->lock);
317
 
318
        z->base = start;
319
        z->flags = flags;
320
 
321
        z->free_count = cnt;
322
        list_initialize(&z->free_head);
323
 
324
        z->busy_count = 0;
325
 
374 jermar 326
        z->frames = (frame_t *) early_malloc(cnt * sizeof(frame_t));
367 jermar 327
        if (!z->frames) {
375 jermar 328
            early_free(z);
367 jermar 329
            return NULL;
330
        }
331
 
332
        for (i = 0; i<cnt; i++) {
333
            frame_initialize(&z->frames[i], z);
334
            list_append(&z->frames[i].link, &z->free_head);
335
        }
336
 
479 bondari 337
        /*
338
         * Create buddy system for the zone
339
         */
340
        for (max_order = 0; cnt >> max_order; max_order++);
489 jermar 341
        z->buddy_system = buddy_system_create(max_order, &zone_buddy_system_operations, (void *) z);
367 jermar 342
    }
343
 
344
    return z;
345
}
346
 
347
/** Attach frame zone
348
 *
349
 * Attach frame zone to zone list.
350
 *
351
 * @param zone Zone to be attached.
352
 */
353
void zone_attach(zone_t *zone)
354
{
413 jermar 355
    ipl_t ipl;
367 jermar 356
 
413 jermar 357
    ipl = interrupts_disable();
367 jermar 358
    spinlock_lock(&zone_head_lock);
359
 
360
    list_append(&zone->link, &zone_head);
361
 
362
    spinlock_unlock(&zone_head_lock);
413 jermar 363
    interrupts_restore(ipl);
367 jermar 364
}
365
 
366
/** Initialize frame structure
367
 *
368
 * Initialize frame structure.
369
 *
370
 * @param frame Frame structure to be initialized.
371
 * @param zone Host frame zone.
372
 */
373
void frame_initialize(frame_t *frame, zone_t *zone)
374
{
375
    frame->refcount = 0;
376
    link_initialize(&frame->link);
377
}
479 bondari 378
 
379
 
380
 
381
/*
382
 * buddy system functions (under construction)
383
 *
384
 */
385
 
386
 
387
/** Allocate 2^order frames
388
 *
389
 */
390
__address zone_buddy_frame_alloc(int flags, __u8 order) {
391
    ipl_t ipl;
392
    link_t *cur, *tmp;
393
    zone_t *z;
394
    zone_t *zone = NULL;
395
    frame_t *frame = NULL;
396
    __address v;
397
 
398
loop:
399
    ipl = interrupts_disable();
400
    spinlock_lock(&zone_head_lock);
401
 
402
    /*
403
     * First, find suitable frame zone.
404
     */
405
    for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
406
        z = list_get_instance(cur, zone_t, link);
407
 
408
        spinlock_lock(&z->lock);
409
        /*
410
         * Check if the zone has 2^order frames area available
411
         * TODO: Must check if buddy system has at least block in order >= given order
412
         */
413
        if (z->free_count == (1 >> order)) {
414
            zone = z;
415
            break;
416
        }
417
 
418
        spinlock_unlock(&z->lock);
419
    }
420
 
421
    if (!zone) {
422
        if (flags & FRAME_PANIC)
423
            panic("Can't allocate frame.\n");
424
 
425
        /*
426
         * TODO: Sleep until frames are available again.
427
         */
428
        spinlock_unlock(&zone_head_lock);
429
        interrupts_restore(ipl);
430
 
431
        panic("Sleep not implemented.\n");
432
        goto loop;
433
    }
434
 
435
 
436
    /* Allocate frames from zone buddy system */
437
    cur = buddy_system_alloc(zone->buddy_system, order);
438
 
439
    /* frame will be actually a first frame of the block */
440
    frame = list_get_instance(cur, frame_t, buddy_link);
441
 
442
    /* get frame address */
443
    v = FRAME2ADDR(zone, frame);
444
 
445
    if (flags & FRAME_KA)
446
        v = PA2KA(v);
447
 
448
    spinlock_unlock(&zone->lock);
449
    spinlock_unlock(&zone_head_lock);
450
    interrupts_restore(ipl);
451
 
452
    return v;
453
}
454
 
455
 
456
/** Free frame(s)
457
 *
458
 * @param addr Address of the frame(s) to be freed. It must be a multiple of FRAME_SIZE.
459
 */
460
void zone_buddy_frame_free(__address addr)
461
{
462
    ipl_t ipl;
463
    link_t *cur;
464
    zone_t *z;
465
    zone_t *zone = NULL;
466
    frame_t *frame;
467
 
468
    ASSERT(addr % FRAME_SIZE == 0);
469
 
470
    ipl = interrupts_disable();
471
    spinlock_lock(&zone_head_lock);
472
 
473
    /*
474
     * First, find host frame zone for addr.
475
     */
476
    for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
477
        z = list_get_instance(cur, zone_t, link);
478
 
479
        spinlock_lock(&z->lock);
480
 
481
        if (IS_KA(addr))
482
            addr = KA2PA(addr);
483
 
484
        /*
485
         * Check if addr belongs to z.
486
         */
487
        if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) {
488
            zone = z;
489
            break;
490
        }
491
        spinlock_unlock(&z->lock);
492
    }
493
 
494
    ASSERT(zone != NULL);
495
 
496
    frame = ADDR2FRAME(zone, addr);
497
 
498
    ASSERT(frame->refcount);
499
 
500
    if (!--frame->refcount) {
501
        buddy_system_free(zone->buddy_system, &frame->buddy_link);
502
    }
503
 
504
    spinlock_unlock(&zone->lock);  
505
 
506
    spinlock_unlock(&zone_head_lock);
507
    interrupts_restore(ipl);
508
}
509
 
480 bondari 510
/** Guess zone by frame instance address
511
 *
512
 * @param frame Frame
513
 *
514
 * @return Zone of given frame
515
 */
516
zone_t * get_zone_by_frame(frame_t * frame) {
517
    link_t * cur;
518
    zone_t * zone, *z;
479 bondari 519
 
480 bondari 520
    ASSERT(frame);
521
    /*
522
     * First, find host frame zone for addr.
523
     */
524
    for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
525
        z = list_get_instance(cur, zone_t, link);
526
 
527
        spinlock_lock(&z->lock);
528
 
529
        /*
530
         * Check if frame address belongs to z.
531
         */
532
        if ((frame >= z->frames) && (frame <= z->frames + (z->free_count + z->busy_count))) {
533
            zone = z;
534
            break;
535
        }
536
        spinlock_unlock(&z->lock);
537
    }
538
    ASSERT(zone);
539
 
540
    return zone;
541
 
542
 
543
}
544
 
479 bondari 545
/** Buddy system find_buddy implementation
489 jermar 546
 *
547
 * @param b Buddy system.
480 bondari 548
 * @param block Block for which buddy should be found
479 bondari 549
 *
480 bondari 550
 * @return Buddy for given block if found
479 bondari 551
 */
489 jermar 552
link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * block) {
480 bondari 553
    frame_t * frame, * f;
554
    zone_t * zone;
555
    link_t * cur;
556
    bool is_left, is_right;
479 bondari 557
 
480 bondari 558
    frame = list_get_instance(block, frame_t, buddy_link);
559
    zone = get_zone_by_frame(frame);
560
 
561
 
562
    /*
563
     * (FRAME_INDEX % 2^(ORDER+1)) == 0 ===> LEFT BUDDY
564
     * (FRAME_INDEX % 2^(ORDER+1)) == 2^(ORDER) ===> RIGHT BUDDY
565
     */
566
 
567
    is_left = IS_BUDDY_LEFT_BLOCK(zone, frame);
568
    is_right = IS_BUDDY_RIGHT_BLOCK(zone, frame);
569
 
570
    ASSERT((is_left || is_right) && (!is_left || !is_right));
571
 
572
    for (cur = &zone->buddy_system->order[frame->buddy_order]; cur; cur = cur->next) {
573
        f = list_get_instance(cur, frame_t, buddy_link);
574
 
575
        ASSERT(f->buddy_order == frame->buddy_order);
576
 
577
        /*
578
         * if found frame is coherent with our frame from the left
579
         */
580
        if ((FRAME_INDEX(zone, f) + 1 >> frame->buddy_order == FRAME_INDEX(zone, frame)) && is_right) {
581
            return cur;
582
        }
583
 
584
        /*
585
         * if found frame is coherent with our frame from the right
586
         */
587
        if ((FRAME_INDEX(zone,f) - 1 >> frame->buddy_order == FRAME_INDEX(zone, frame)) && is_left) {
588
            return cur;
589
        }
590
 
591
    }
592
 
593
    return NULL;
594
 
595
 
479 bondari 596
}
597
 
598
/** Buddy system bisect implementation
599
 *
489 jermar 600
 * @param b Buddy system.
480 bondari 601
 * @param block Block to bisect
602
 *
603
 * @return right block
479 bondari 604
 */
489 jermar 605
link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block) {
480 bondari 606
    frame_t * frame_l, * frame_r;
607
 
608
    frame_l = list_get_instance(block, frame_t, buddy_link);
479 bondari 609
 
487 bondari 610
    frame_r = (frame_t *) (&frame_l + (1>>frame_l->buddy_order-1));
480 bondari 611
 
612
    return &frame_r->buddy_link;
613
 
479 bondari 614
}
615
 
616
/** Buddy system coalesce implementation
617
 *
489 jermar 618
 * @param b Buddy system.
480 bondari 619
 * @param block_1 First block
620
 * @param block_2 First block's buddy
621
 *
622
 * @return Coalesced block (actually block that represents lower address)
479 bondari 623
 */
489 jermar 624
link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * block_1, link_t * block_2) {
480 bondari 625
    frame_t * frame1, * frame2;
626
 
627
    frame1 = list_get_instance(block_1, frame_t, buddy_link);
628
    frame2 = list_get_instance(block_2, frame_t, buddy_link);
629
 
488 bondari 630
    return &frame1 < &frame2 ? block_1 : block_2;
479 bondari 631
}
632
 
633
/** Buddy system set_order implementation
489 jermar 634
 *
635
 * @param b Buddy system.
480 bondari 636
 * @param block Buddy system block
637
 * @param order Order to set
479 bondari 638
 */
489 jermar 639
void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order) {
480 bondari 640
    frame_t * frame;
641
    frame = list_get_instance(block, frame_t, buddy_link);
642
    frame->buddy_order = order;
479 bondari 643
}
644
 
645
/** Buddy system get_order implementation
489 jermar 646
 *
647
 * @param b Buddy system.
480 bondari 648
 * @param block Buddy system block
479 bondari 649
 *
480 bondari 650
 * @return Order of block
479 bondari 651
 */
489 jermar 652
__u8 zone_buddy_get_order(buddy_system_t *b, link_t * block) {
480 bondari 653
    frame_t * frame;
654
    frame = list_get_instance(block, frame_t, buddy_link);
655
    return frame->buddy_order;
479 bondari 656
}