buddy.h

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00001 /*
00002  * Copyright (C) 2005 Jakub Jermar
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  *
00009  * - Redistributions of source code must retain the above copyright
00010  *   notice, this list of conditions and the following disclaimer.
00011  * - Redistributions in binary form must reproduce the above copyright
00012  *   notice, this list of conditions and the following disclaimer in the
00013  *   documentation and/or other materials provided with the distribution.
00014  * - The name of the author may not be used to endorse or promote products
00015  *   derived from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00019  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00020  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00022  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00023  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00024  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00025  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00026  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  */
00028 
00035 #ifndef __BUDDY_H__
00036 #define __BUDDY_H__
00037 
00038 #include <arch/types.h>
00039 #include <typedefs.h>
00040 
00041 #define BUDDY_SYSTEM_INNER_BLOCK        0xff
00042 
00044 struct buddy_system_operations {
00045         link_t *(* find_buddy)(buddy_system_t *, link_t *);             
00046         link_t *(* bisect)(buddy_system_t *, link_t *);                 
00047         link_t *(* coalesce)(buddy_system_t *, link_t *, link_t *);     
00048         void (*set_order)(buddy_system_t *, link_t *, __u8);            
00049         __u8 (*get_order)(buddy_system_t *, link_t *);                  
00050         void (*mark_busy)(buddy_system_t *, link_t *);                  
00051         void (*mark_available)(buddy_system_t *, link_t *);             
00053         link_t *(* find_block)(buddy_system_t *, link_t *, __u8);
00054         void (* print_id)(buddy_system_t *, link_t *);
00055 };
00056 
00057 struct buddy_system {
00058         __u8 max_order;                         
00059         link_t *order;
00060         buddy_system_operations_t *op;
00061         void *data;                             
00062 };
00063 
00064 extern void buddy_system_create(buddy_system_t *b,
00065                                 __u8 max_order, 
00066                                 buddy_system_operations_t *op, void *data);
00067 extern link_t *buddy_system_alloc(buddy_system_t *b, __u8 i);
00068 extern bool buddy_system_can_alloc(buddy_system_t *b, __u8 order);
00069 extern void buddy_system_free(buddy_system_t *b, link_t *block);
00070 extern void buddy_system_structure_print(buddy_system_t *b, size_t elem_size);
00071 extern size_t buddy_conf_size(int max_order);
00072 extern link_t *buddy_system_alloc_block(buddy_system_t *b, link_t *block);
00073 
00074 #endif
00075 

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