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