| 1 | /*
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| 2 | * Copyright (C) 2005 Jakub Jermar
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| 3 | * Copyright (C) 2005 Sergey Bondari
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * - Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * - Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * - The name of the author may not be used to endorse or promote products
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| 16 | * derived from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | #ifndef __FRAME_H__
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| 31 | #define __FRAME_H__
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| 32 |
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| 33 | #include <arch/types.h>
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| 34 | #include <typedefs.h>
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| 35 | #include <list.h>
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| 36 | #include <synch/spinlock.h>
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| 37 | #include <mm/buddy.h>
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| 38 |
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| 39 | #define FRAME_KA 1 /* skip frames conflicting with user address space */
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| 40 | #define FRAME_PANIC 2 /* panic on failure */
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| 41 |
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| 42 | #define FRAME2ADDR(zone, frame) ((zone)->base + ((frame) - (zone)->frames) * FRAME_SIZE)
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| 43 | #define ADDR2FRAME(zone, addr) (&((zone)->frames[((addr) - (zone)->base) / FRAME_SIZE]))
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| 44 | #define FRAME_INDEX(zone, frame) ((count_t)((frame) - (zone)->frames))
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| 45 | #define IS_BUDDY_LEFT_BLOCK(zone, frame) ((FRAME_INDEX((zone), (frame)) % (1 >> ((frame)->buddy_order + 1))) == 0)
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| 46 | #define IS_BUDDY_RIGHT_BLOCK(zone, frame) ((FRAME_INDEX((zone), (frame)) % (1 >> ((frame)->buddy_order + 1))) == (1 >> (frame)->buddy_order))
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| 47 |
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| 48 |
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| 49 |
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| 50 | struct zone {
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| 51 | link_t link; /**< link to previous and next zone */
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| 52 |
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| 53 | spinlock_t lock; /**< this lock protects everything below */
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| 54 | __address base; /**< physical address of the first frame in the frames array */
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| 55 | frame_t *frames; /**< array of frame_t structures in this zone */
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| 56 | link_t free_head; /**< list of free frame_t structures */
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| 57 | count_t free_count; /**< number of frame_t structures in free list */
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| 58 | count_t busy_count; /**< number of frame_t structures not in free list */
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| 59 |
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| 60 | buddy_system_t * buddy_system; /**< buddy system for the zone */
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| 61 | int flags;
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| 62 | };
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| 63 |
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| 64 | struct frame {
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| 65 | count_t refcount; /**< when == 0, the frame is in free list */
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| 66 | link_t link; /**< link to zone free list when refcount == 0 */
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| 67 | __u8 buddy_order; /**< buddy system block order */
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| 68 | link_t buddy_link; /**< link to the next free block inside one order*/
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| 69 | };
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| 70 |
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| 71 | extern spinlock_t zone_head_lock; /**< this lock protects zone_head list */
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| 72 | extern link_t zone_head; /**< list of all zones in the system */
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| 73 |
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| 74 | extern void zone_init(void);
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| 75 | extern zone_t *zone_create(__address start, size_t size, int flags);
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| 76 | extern void zone_attach(zone_t *zone);
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| 77 |
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| 78 | extern void frame_init(void);
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| 79 | extern void frame_initialize(frame_t *frame, zone_t *zone);
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| 80 | __address frame_alloc(int flags);
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| 81 | extern void frame_free(__address addr);
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| 82 | extern void frame_not_free(__address addr);
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| 83 | extern void frame_region_not_free(__address start, __address stop);
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| 84 | zone_t * get_zone_by_frame(frame_t * frame);
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| 85 |
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| 86 | /*
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| 87 | * Buddy system operations
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| 88 | */
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| 89 | link_t * zone_buddy_find_buddy(link_t * buddy);
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| 90 | link_t * zone_buddy_bisect(link_t * block);
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| 91 | link_t * zone_buddy_coalesce(link_t * buddy_l, link_t * buddy_r);
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| 92 | void zone_buddy_set_order(link_t * block, __u8 order);
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| 93 | __u8 zone_buddy_get_order(link_t * block);
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| 94 |
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| 95 | __address zone_buddy_frame_alloc(int flags, __u8 order);
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| 96 | void zone_buddy_frame_free(__address addr);
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| 97 |
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| 98 | /*
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| 99 | * TODO: Implement the following functions.
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| 100 | */
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| 101 | extern frame_t *frame_reference(frame_t *frame);
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| 102 | extern void frame_release(frame_t *frame);
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| 103 |
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| 104 | #endif
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