WebSVN – HelenOS-historic – Diff – /kernel/trunk/genarch/src/mm/as_ht.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 genarch
 * @ingroup mm
 * @{
 */
 
/**
 * @file
 * @brief   Address space functions for global page hash table.
 */
 
#include <genarch/mm/as_ht.h>
#include <genarch/mm/page_ht.h>
#include <mm/as.h>
#include <mm/frame.h>
#include <arch/types.h>
#include <typedefs.h>
#include <memstr.h>
#include <adt/hash_table.h>
#include <synch/mutex.h>
 
static pte_t *ht_create(int flags);
static void ht_destroy(pte_t *page_table);
 
static void ht_lock(as_t *as, bool lock);
static void ht_unlock(as_t *as, bool unlock);
 
as_operations_t as_ht_operations = {
    .page_table_create = ht_create,
    .page_table_destroy = ht_destroy,
    .page_table_lock = ht_lock,
    .page_table_unlock = ht_unlock,
};
 
 
/** Page hash table create.
 *
 * The page hash table will be created only once
 * and will be shared by all address spaces.
 *
 * @param flags Ignored.
 *
 * @return Returns NULL.
 */
pte_t *ht_create(int flags)
{
    if (flags & FLAG_AS_KERNEL) {
        hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations);
        mutex_initialize(&page_ht_lock);
    }
    return NULL;
}
 
/** Destroy page table.
 *
 * Actually do nothing as the global page hash table is used.
 *
 * @param page_table This parameter is ignored.
 */
void ht_destroy(pte_t *page_table)
{
    /* No-op. */
}
 
/** Lock page table.
 *
 * Lock address space and page hash table.
 * Interrupts must be disabled.
 *
 * @param as Address space.
 * @param lock If false, do not attempt to lock the address space.
 */
void ht_lock(as_t *as, bool lock)
{
    if (lock)
        mutex_lock(&as->lock);
    mutex_lock(&page_ht_lock);
}
 
/** Unlock page table.
 *
 * Unlock address space and page hash table.
 * Interrupts must be disabled.
 *
 * @param as Address space.
 * @param unlock If false, do not attempt to lock the address space.
 */
void ht_unlock(as_t *as, bool unlock)
{
    mutex_unlock(&page_ht_lock);
    if (unlock)
        mutex_unlock(&as->lock);
}
 
 /** @}
 */
 
 

Rev 1468	Rev 1702
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
-		29	/** @addtogroup genarchmm genarch
-		30	* @ingroup mm
-		31	* @{
-		32	*/
28		33
29	/**	34	/**
30	* @file as_ht.c	35	* @file
31	* @brief Address space functions for global page hash table.	36	* @brief Address space functions for global page hash table.
32	*/	37	*/
33		38
34	#include <genarch/mm/as_ht.h>	39	#include <genarch/mm/as_ht.h>
35	#include <genarch/mm/page_ht.h>	40	#include <genarch/mm/page_ht.h>
36	#include <mm/as.h>	41	#include <mm/as.h>
37	#include <mm/frame.h>	42	#include <mm/frame.h>
38	#include <arch/types.h>	43	#include <arch/types.h>
39	#include <typedefs.h>	44	#include <typedefs.h>
40	#include <memstr.h>	45	#include <memstr.h>
41	#include <adt/hash_table.h>	46	#include <adt/hash_table.h>
42	#include <synch/mutex.h>	47	#include <synch/mutex.h>
43		48
44	static pte_t *ht_create(int flags);	49	static pte_t *ht_create(int flags);
45	static void ht_destroy(pte_t *page_table);	50	static void ht_destroy(pte_t *page_table);
46		51
47	static void ht_lock(as_t *as, bool lock);	52	static void ht_lock(as_t *as, bool lock);
48	static void ht_unlock(as_t *as, bool unlock);	53	static void ht_unlock(as_t *as, bool unlock);
49		54
50	as_operations_t as_ht_operations = {	55	as_operations_t as_ht_operations = {
51	.page_table_create = ht_create,	56	.page_table_create = ht_create,
52	.page_table_destroy = ht_destroy,	57	.page_table_destroy = ht_destroy,
53	.page_table_lock = ht_lock,	58	.page_table_lock = ht_lock,
54	.page_table_unlock = ht_unlock,	59	.page_table_unlock = ht_unlock,
55	};	60	};
56		61
57		62
58	/** Page hash table create.	63	/** Page hash table create.
59	*	64	*
60	* The page hash table will be created only once	65	* The page hash table will be created only once
61	* and will be shared by all address spaces.	66	* and will be shared by all address spaces.
62	*	67	*
63	* @param flags Ignored.	68	* @param flags Ignored.
64	*	69	*
65	* @return Returns NULL.	70	* @return Returns NULL.
66	*/	71	*/
67	pte_t *ht_create(int flags)	72	pte_t *ht_create(int flags)
68	{	73	{
69	if (flags & FLAG_AS_KERNEL) {	74	if (flags & FLAG_AS_KERNEL) {
70	hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations);	75	hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations);
71	mutex_initialize(&page_ht_lock);	76	mutex_initialize(&page_ht_lock);
72	}	77	}
73	return NULL;	78	return NULL;
74	}	79	}
75		80
76	/** Destroy page table.	81	/** Destroy page table.
77	*	82	*
78	* Actually do nothing as the global page hash table is used.	83	* Actually do nothing as the global page hash table is used.
79	*	84	*
80	* @param page_table This parameter is ignored.	85	* @param page_table This parameter is ignored.
81	*/	86	*/
82	void ht_destroy(pte_t *page_table)	87	void ht_destroy(pte_t *page_table)
83	{	88	{
84	/* No-op. */	89	/* No-op. */
85	}	90	}
86		91
87	/** Lock page table.	92	/** Lock page table.
88	*	93	*
89	* Lock address space and page hash table.	94	* Lock address space and page hash table.
90	* Interrupts must be disabled.	95	* Interrupts must be disabled.
91	*	96	*
92	* @param as Address space.	97	* @param as Address space.
93	* @param lock If false, do not attempt to lock the address space.	98	* @param lock If false, do not attempt to lock the address space.
94	*/	99	*/
95	void ht_lock(as_t *as, bool lock)	100	void ht_lock(as_t *as, bool lock)
96	{	101	{
97	if (lock)	102	if (lock)
98	mutex_lock(&as->lock);	103	mutex_lock(&as->lock);
99	mutex_lock(&page_ht_lock);	104	mutex_lock(&page_ht_lock);
100	}	105	}
101		106
102	/** Unlock page table.	107	/** Unlock page table.
103	*	108	*
104	* Unlock address space and page hash table.	109	* Unlock address space and page hash table.
105	* Interrupts must be disabled.	110	* Interrupts must be disabled.
106	*	111	*
107	* @param as Address space.	112	* @param as Address space.
108	* @param unlock If false, do not attempt to lock the address space.	113	* @param unlock If false, do not attempt to lock the address space.
109	*/	114	*/
110	void ht_unlock(as_t *as, bool unlock)	115	void ht_unlock(as_t *as, bool unlock)
111	{	116	{
112	mutex_unlock(&page_ht_lock);	117	mutex_unlock(&page_ht_lock);
113	if (unlock)	118	if (unlock)
114	mutex_unlock(&as->lock);	119	mutex_unlock(&as->lock);
115	}	120	}
-		121
-		122	/** @}
-		123	*/
-		124
116		125

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/genarch/src/mm/as_ht.c – Rev 1468 → 1702