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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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| 1 | jermar | 36 | |
| 37 | #define FRAME_KA 1 /* skip frames conflicting with user address space */ |
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| 38 | #define FRAME_PANIC 2 /* panic on failure */ |
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| 39 | |||
| 366 | jermar | 40 | struct zone { |
| 41 | link_t link; /**< link to previous and next zone */ |
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| 354 | jermar | 42 | |
| 355 | jermar | 43 | spinlock_t lock; /**< this lock protects everything below */ |
| 44 | __address base; /**< physical address of the first frame in the frames array */ |
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| 45 | frame_t *frames; /**< array of frame_t structures in this zone */ |
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| 46 | link_t free_head; /**< list of free frame_t structures */ |
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| 47 | link_t busy_head; /**< list of busy frame_t structures */ |
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| 48 | count_t free_count; /**< number of frame_t structures in free list */ |
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| 49 | count_t busy_count; /**< number of frame_t structures in busy list */ |
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| 354 | jermar | 50 | int flags; |
| 51 | }; |
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| 52 | |||
| 53 | struct frame { |
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| 54 | count_t refcount; /**< when > 0, the frame is in busy list, otherwise the frame is in free list */ |
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| 55 | link_t link; /**< link either to frame_zone free or busy list */ |
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| 56 | }; |
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| 57 | |||
| 366 | jermar | 58 | extern spinlock_t zone_head_lock; /**< this lock protects zone_head list */ |
| 59 | extern link_t zone_head; /**< list of all zones in the system */ |
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| 354 | jermar | 60 | |
| 368 | jermar | 61 | extern void zone_init(void); |
| 62 | extern zone_t *zone_create(__address start, size_t size, int flags); |
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| 63 | extern void zone_attach(zone_t *zone); |
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| 1 | jermar | 64 | |
| 65 | extern void frame_init(void); |
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| 368 | jermar | 66 | extern void frame_initialize(frame_t *frame, zone_t *zone); |
| 1 | jermar | 67 | __address frame_alloc(int flags); |
| 68 | extern void frame_free(__address addr); |
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| 69 | extern void frame_not_free(__address addr); |
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| 70 | extern void frame_region_not_free(__address start, __address stop); |
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| 71 | |||
| 366 | jermar | 72 | /* |
| 73 | * TODO: Implement the following functions. |
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| 74 | */ |
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| 75 | extern frame_t *frame_reference(frame_t *frame); |
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| 76 | extern void frame_release(frame_t *frame); |
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| 77 | |||
| 1 | jermar | 78 | #endif |