WebSVN – HelenOS-historic – Diff – /kernel/trunk/genarch/src/mm/asid_fifo.c


/*
 * Copyright (C) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <genarch/mm/asid_fifo.h>
#include <arch/mm/asid.h>
#include <mm/asid.h>
#include <typedefs.h>
#include <adt/fifo.h>
 
#define FIFO_STATIC_LIMIT   1024
#define FIFO_STATIC     (ASIDS_ALLOCABLE<FIFO_STATIC_LIMIT)
 
/**
 * FIFO queue containing unassigned ASIDs.
 * Can be only accessed when asidlock is held.
 */
#if FIFO_STATIC
FIFO_INITIALIZE_STATIC(free_asids, asid_t, ASIDS_ALLOCABLE);
#else
FIFO_INITIALIZE_DYNAMIC(free_asids, asid_t, ASIDS_ALLOCABLE);
#endif
 
/** Initialize data structures for O(1) ASID allocation and deallocation. */
void asid_fifo_init(void)
{
    int i;
 
    #if (!FIFO_STATIC)
    fifo_create(free_asids);
    #endif
       
    for (i = 0; i < ASIDS_ALLOCABLE; i++) {
        fifo_push(free_asids, ASID_START + i);
    }
}
 
/** Allocate free ASID.
 *
 * Allocation runs in O(1).
 *
 * @return Free ASID.
 */
asid_t asid_find_free(void)
{
    return fifo_pop(free_asids);
}
 
/** Return ASID among free ASIDs.
 *
 * This operation runs in O(1).
 *
 * @param asid ASID being freed.
 */
void asid_put_arch(asid_t asid)
{
    fifo_push(free_asids, asid);
}
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/genarch/src/mm/asid_fifo.c @ 1266 – Rev 830 → 831

Rev 830		Rev 831
1	/*	1	/*
2	* Copyright (C) 2006 Jakub Jermar	2	* Copyright (C) 2006 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	#include <genarch/mm/asid_fifo.h>	29	#include <genarch/mm/asid_fifo.h>
30	#include <arch/mm/asid.h>	30	#include <arch/mm/asid.h>
31	#include <mm/asid.h>	31	#include <mm/asid.h>
32	#include <typedefs.h>	32	#include <typedefs.h>
33	#include <adt/fifo.h>	33	#include <adt/fifo.h>
34		34
35	#define FIFO_STATIC_LIMIT 1024	35	#define FIFO_STATIC_LIMIT 1024
36	#define FIFO_STATIC (ASIDS_ALLOCABLE<FIFO_STATIC_LIMIT)	36	#define FIFO_STATIC (ASIDS_ALLOCABLE<FIFO_STATIC_LIMIT)
-		37
37	/**	38	/**
38	* FIFO queue containing unassigned ASIDs.	39	* FIFO queue containing unassigned ASIDs.
39	* Can be only accessed when asidlock is held.	40	* Can be only accessed when asidlock is held.
40	*/	41	*/
41	#if FIFO_STATIC	42	#if FIFO_STATIC
42	FIFO_INITIALIZE_STATIC(free_asids, asid_t, ASIDS_ALLOCABLE);	43	FIFO_INITIALIZE_STATIC(free_asids, asid_t, ASIDS_ALLOCABLE);
43	#else	44	#else
44	FIFO_INITIALIZE_DYNAMIC(free_asids, asid_t, ASIDS_ALLOCABLE);	45	FIFO_INITIALIZE_DYNAMIC(free_asids, asid_t, ASIDS_ALLOCABLE);
45	#endif	46	#endif
46		47
47	/** Initialize data structures for O(1) ASID allocation and deallocation. */	48	/** Initialize data structures for O(1) ASID allocation and deallocation. */
48	void asid_fifo_init(void)	49	void asid_fifo_init(void)
49	{	50	{
50	int i;	51	int i;
51		52
52	#if (!FIFO_STATIC)	53	#if (!FIFO_STATIC)
53	fifo_create(free_asids);	54	fifo_create(free_asids);
54	#endif	55	#endif
55		56
56	for (i = 0; i < ASIDS_ALLOCABLE; i++) {	57	for (i = 0; i < ASIDS_ALLOCABLE; i++) {
57	fifo_push(free_asids, ASID_START + i);	58	fifo_push(free_asids, ASID_START + i);
58	}	59	}
59	}	60	}
60		61
61	/** Allocate free ASID.	62	/** Allocate free ASID.
62	*	63	*
63	* Allocation runs in O(1).	64	* Allocation runs in O(1).
64	*	65	*
65	* @return Free ASID.	66	* @return Free ASID.
66	*/	67	*/
67	asid_t asid_find_free(void)	68	asid_t asid_find_free(void)
68	{	69	{
69	return fifo_pop(free_asids);	70	return fifo_pop(free_asids);
70	}	71	}
71		72
72	/** Return ASID among free ASIDs.	73	/** Return ASID among free ASIDs.
73	*	74	*
74	* This operation runs in O(1).	75	* This operation runs in O(1).
75	*	76	*
76	* @param asid ASID being freed.	77	* @param asid ASID being freed.
77	*/	78	*/
78	void asid_put_arch(asid_t asid)	79	void asid_put_arch(asid_t asid)
79	{	80	{
80	fifo_push(free_asids, asid);	81	fifo_push(free_asids, asid);
81	}	82	}
82		83