| 1 | /*
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| 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 |
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| 29 | #ifndef __FRAME_H__
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| 30 | #define __FRAME_H__
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| 31 |
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| 32 | #include <arch/types.h>
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| 33 | #include <typedefs.h>
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| 34 | #include <list.h>
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| 35 | #include <synch/spinlock.h>
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| 36 |
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| 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 |
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| 40 | struct frame_zone {
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| 41 | link_t fz_link; /**< link to previous and next frame_zone */
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| 42 |
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| 43 | spinlock_t lock; /**< this lock protexts everything below */
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| 44 | link_t free_head; /**< list of free frames */
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| 45 | link_t busy_head; /**< list of busy frames */
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| 46 | count_t free_count; /**< frames in free list */
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| 47 | count_t busy_count; /**< frames in busy list */
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| 48 | frame_t *frames; /**< array of frames in this zone */
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| 49 | int flags;
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| 50 | };
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| 51 |
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| 52 | struct frame {
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| 53 | count_t refcount; /**< when > 0, the frame is in busy list, otherwise the frame is in free list */
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| 54 | link_t link; /**< link either to frame_zone free or busy list */
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| 55 | };
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| 56 |
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| 57 | extern spinlock_t frame_zone_head_lock; /**< this lock protects frame_zone_head list */
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| 58 | extern link_t frame_zone_head; /**< list of all frame_zone's in the system */
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| 59 |
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| 60 | extern count_t frames;
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| 61 | extern count_t frames_free;
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| 62 |
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| 63 | extern count_t kernel_frames;
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| 64 | extern count_t kernel_frames_free;
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| 65 |
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| 66 | extern __u8 *frame_bitmap;
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| 67 | extern count_t frame_bitmap_octets;
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| 68 |
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| 69 | extern __u8 *frame_kernel_bitmap;
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| 70 |
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| 71 | extern void frame_init(void);
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| 72 |
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| 73 | __address frame_alloc(int flags);
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| 74 | extern void frame_free(__address addr);
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| 75 | extern void frame_not_free(__address addr);
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| 76 | extern void frame_region_not_free(__address start, __address stop);
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| 77 |
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| 78 | #endif
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