| 1 | /*
|
|---|
| 2 | * Copyright (C) 2005 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 |
|
|---|
| 29 | #ifndef __FRAME_H__
|
|---|
| 30 | #define __FRAME_H__
|
|---|
| 31 |
|
|---|
| 32 | #include <arch/types.h>
|
|---|
| 33 | #include <typedefs.h>
|
|---|
| 34 | #include <list.h>
|
|---|
| 35 | #include <synch/spinlock.h>
|
|---|
| 36 |
|
|---|
| 37 | #define FRAME_KA 1 /* skip frames conflicting with user address space */
|
|---|
| 38 | #define FRAME_PANIC 2 /* panic on failure */
|
|---|
| 39 |
|
|---|
| 40 | struct zone {
|
|---|
| 41 | link_t link; /**< link to previous and next zone */
|
|---|
| 42 |
|
|---|
| 43 | spinlock_t lock; /**< this lock protects everything below */
|
|---|
| 44 | __address base; /**< physical address of the first frame in the frames array */
|
|---|
| 45 | frame_t *frames; /**< array of frame_t structures in this zone */
|
|---|
| 46 | link_t free_head; /**< list of free frame_t structures */
|
|---|
| 47 | link_t busy_head; /**< list of busy frame_t structures */
|
|---|
| 48 | count_t free_count; /**< number of frame_t structures in free list */
|
|---|
| 49 | count_t busy_count; /**< number of frame_t structures in busy list */
|
|---|
| 50 | int flags;
|
|---|
| 51 | };
|
|---|
| 52 |
|
|---|
| 53 | struct frame {
|
|---|
| 54 | zone_t *zone; /**< host zone */
|
|---|
| 55 | count_t refcount; /**< when > 0, the frame is in busy list, otherwise the frame is in free list */
|
|---|
| 56 | link_t link; /**< link either to frame_zone free or busy list */
|
|---|
| 57 | };
|
|---|
| 58 |
|
|---|
| 59 | extern spinlock_t zone_head_lock; /**< this lock protects zone_head list */
|
|---|
| 60 | extern link_t zone_head; /**< list of all zones in the system */
|
|---|
| 61 |
|
|---|
| 62 | extern count_t frames;
|
|---|
| 63 | extern count_t frames_free;
|
|---|
| 64 |
|
|---|
| 65 | extern count_t kernel_frames;
|
|---|
| 66 | extern count_t kernel_frames_free;
|
|---|
| 67 |
|
|---|
| 68 | extern __u8 *frame_bitmap;
|
|---|
| 69 | extern count_t frame_bitmap_octets;
|
|---|
| 70 |
|
|---|
| 71 | extern __u8 *frame_kernel_bitmap;
|
|---|
| 72 |
|
|---|
| 73 | extern void frame_init(void);
|
|---|
| 74 |
|
|---|
| 75 | __address frame_alloc(int flags);
|
|---|
| 76 | extern void frame_free(__address addr);
|
|---|
| 77 | extern void frame_not_free(__address addr);
|
|---|
| 78 | extern void frame_region_not_free(__address start, __address stop);
|
|---|
| 79 |
|
|---|
| 80 | extern void zone_init(void);
|
|---|
| 81 | extern zone_t *zone_create(__address start, size_t size, int flags);
|
|---|
| 82 | extern void zone_attach(zone_t *zone);
|
|---|
| 83 |
|
|---|
| 84 | extern void frame_initialize(frame_t *frame, zone_t *zone);
|
|---|
| 85 | extern __address frame_get_address(frame_t *frame);
|
|---|
| 86 |
|
|---|
| 87 | /*
|
|---|
| 88 | * TODO: Implement the following functions.
|
|---|
| 89 | */
|
|---|
| 90 |
|
|---|
| 91 | /*
|
|---|
| 92 | extern frame_t *frame_alloc(int flags);
|
|---|
| 93 | extern void frame_free(frame_t *frame);
|
|---|
| 94 | */
|
|---|
| 95 | extern frame_t *frame_reference(frame_t *frame);
|
|---|
| 96 | extern void frame_release(frame_t *frame);
|
|---|
| 97 |
|
|---|
| 98 | #endif
|
|---|
