WebSVN – HelenOS – Diff – /trunk/kernel/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.
 */
 
/** @addtogroup genarchmm
 * @{
 */
 
/**
 * @file
 * @brief   FIFO queue ASID management.
 *
 * Architectures that link with this file keep the unallocated ASIDs
 * in FIFO queue. The queue can be statically (e.g. mips32) or
 * dynamically allocated (e.g ia64 and sparc64).
 */
 
#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);
}
 
/** @}
 */
 

Rev 2007	Rev 2071
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	/** @addtogroup genarchmm	29	/** @addtogroup genarchmm
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file	34	* @file
35	* @brief FIFO queue ASID management.	35	* @brief FIFO queue ASID management.
36	*	36	*
37	* Architectures that link with this file keep the unallocated ASIDs	37	* Architectures that link with this file keep the unallocated ASIDs
38	* in FIFO queue. The queue can be statically (e.g. mips32) or	38	* in FIFO queue. The queue can be statically (e.g. mips32) or
39	* dynamically allocated (e.g ia64 and sparc64).	39	* dynamically allocated (e.g ia64 and sparc64).
40	*/	40	*/
41		41
42	#include <genarch/mm/asid_fifo.h>	42	#include <genarch/mm/asid_fifo.h>
43	#include <arch/mm/asid.h>	43	#include <arch/mm/asid.h>
44	#include <mm/asid.h>	44	#include <mm/asid.h>
45	#include <typedefs.h>	45	#include <typedefs.h>
46	#include <adt/fifo.h>	46	#include <adt/fifo.h>
47		47
48	#define FIFO_STATIC_LIMIT 1024	48	#define FIFO_STATIC_LIMIT 1024
49	#define FIFO_STATIC (ASIDS_ALLOCABLE<FIFO_STATIC_LIMIT)	49	#define FIFO_STATIC (ASIDS_ALLOCABLE<FIFO_STATIC_LIMIT)
50		50
51	/**	51	/**
52	* FIFO queue containing unassigned ASIDs.	52	* FIFO queue containing unassigned ASIDs.
53	* Can be only accessed when asidlock is held.	53	* Can be only accessed when asidlock is held.
54	*/	54	*/
55	#if FIFO_STATIC	55	#if FIFO_STATIC
56	FIFO_INITIALIZE_STATIC(free_asids, asid_t, ASIDS_ALLOCABLE);	56	FIFO_INITIALIZE_STATIC(free_asids, asid_t, ASIDS_ALLOCABLE);
57	#else	57	#else
58	FIFO_INITIALIZE_DYNAMIC(free_asids, asid_t, ASIDS_ALLOCABLE);	58	FIFO_INITIALIZE_DYNAMIC(free_asids, asid_t, ASIDS_ALLOCABLE);
59	#endif	59	#endif
60		60
61	/** Initialize data structures for O(1) ASID allocation and deallocation. */	61	/** Initialize data structures for O(1) ASID allocation and deallocation. */
62	void asid_fifo_init(void)	62	void asid_fifo_init(void)
63	{	63	{
64	int i;	64	int i;
65		65
66	#if (!FIFO_STATIC)	66	#if (!FIFO_STATIC)
67	fifo_create(free_asids);	67	fifo_create(free_asids);
68	#endif	68	#endif
69		69
70	for (i = 0; i < ASIDS_ALLOCABLE; i++) {	70	for (i = 0; i < ASIDS_ALLOCABLE; i++) {
71	fifo_push(free_asids, ASID_START + i);	71	fifo_push(free_asids, ASID_START + i);
72	}	72	}
73	}	73	}
74		74
75	/** Allocate free ASID.	75	/** Allocate free ASID.
76	*	76	*
77	* Allocation runs in O(1).	77	* Allocation runs in O(1).
78	*	78	*
79	* @return Free ASID.	79	* @return Free ASID.
80	*/	80	*/
81	asid_t asid_find_free(void)	81	asid_t asid_find_free(void)
82	{	82	{
83	return fifo_pop(free_asids);	83	return fifo_pop(free_asids);
84	}	84	}
85		85
86	/** Return ASID among free ASIDs.	86	/** Return ASID among free ASIDs.
87	*	87	*
88	* This operation runs in O(1).	88	* This operation runs in O(1).
89	*	89	*
90	* @param asid ASID being freed.	90	* @param asid ASID being freed.
91	*/	91	*/
92	void asid_put_arch(asid_t asid)	92	void asid_put_arch(asid_t asid)
93	{	93	{
94	fifo_push(free_asids, asid);	94	fifo_push(free_asids, asid);
95	}	95	}
96		96
97	/** @}	97	/** @}
98	*/	98	*/
99		99

Subversion Repositories HelenOS

(root)/trunk/kernel/genarch/src/mm/asid_fifo.c – Rev 2007 → 2071