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
 
 * @{
 */
 
/**
 * @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 1702	Rev 1705
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 genarch	29	/** @addtogroup genarchmm
30	* @ingroup mm	-
31	* @{	30	* @{
32	*/	31	*/
33		32
34	/**	33	/**
35	* @file	34	* @file
36	* @brief Address space functions for global page hash table.	35	* @brief Address space functions for global page hash table.
37	*/	36	*/
38		37
39	#include <genarch/mm/as_ht.h>	38	#include <genarch/mm/as_ht.h>
40	#include <genarch/mm/page_ht.h>	39	#include <genarch/mm/page_ht.h>
41	#include <mm/as.h>	40	#include <mm/as.h>
42	#include <mm/frame.h>	41	#include <mm/frame.h>
43	#include <arch/types.h>	42	#include <arch/types.h>
44	#include <typedefs.h>	43	#include <typedefs.h>
45	#include <memstr.h>	44	#include <memstr.h>
46	#include <adt/hash_table.h>	45	#include <adt/hash_table.h>
47	#include <synch/mutex.h>	46	#include <synch/mutex.h>
48		47
49	static pte_t *ht_create(int flags);	48	static pte_t *ht_create(int flags);
50	static void ht_destroy(pte_t *page_table);	49	static void ht_destroy(pte_t *page_table);
51		50
52	static void ht_lock(as_t *as, bool lock);	51	static void ht_lock(as_t *as, bool lock);
53	static void ht_unlock(as_t *as, bool unlock);	52	static void ht_unlock(as_t *as, bool unlock);
54		53
55	as_operations_t as_ht_operations = {	54	as_operations_t as_ht_operations = {
56	.page_table_create = ht_create,	55	.page_table_create = ht_create,
57	.page_table_destroy = ht_destroy,	56	.page_table_destroy = ht_destroy,
58	.page_table_lock = ht_lock,	57	.page_table_lock = ht_lock,
59	.page_table_unlock = ht_unlock,	58	.page_table_unlock = ht_unlock,
60	};	59	};
61		60
62		61
63	/** Page hash table create.	62	/** Page hash table create.
64	*	63	*
65	* The page hash table will be created only once	64	* The page hash table will be created only once
66	* and will be shared by all address spaces.	65	* and will be shared by all address spaces.
67	*	66	*
68	* @param flags Ignored.	67	* @param flags Ignored.
69	*	68	*
70	* @return Returns NULL.	69	* @return Returns NULL.
71	*/	70	*/
72	pte_t *ht_create(int flags)	71	pte_t *ht_create(int flags)
73	{	72	{
74	if (flags & FLAG_AS_KERNEL) {	73	if (flags & FLAG_AS_KERNEL) {
75	hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations);	74	hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations);
76	mutex_initialize(&page_ht_lock);	75	mutex_initialize(&page_ht_lock);
77	}	76	}
78	return NULL;	77	return NULL;
79	}	78	}
80		79
81	/** Destroy page table.	80	/** Destroy page table.
82	*	81	*
83	* Actually do nothing as the global page hash table is used.	82	* Actually do nothing as the global page hash table is used.
84	*	83	*
85	* @param page_table This parameter is ignored.	84	* @param page_table This parameter is ignored.
86	*/	85	*/
87	void ht_destroy(pte_t *page_table)	86	void ht_destroy(pte_t *page_table)
88	{	87	{
89	/* No-op. */	88	/* No-op. */
90	}	89	}
91		90
92	/** Lock page table.	91	/** Lock page table.
93	*	92	*
94	* Lock address space and page hash table.	93	* Lock address space and page hash table.
95	* Interrupts must be disabled.	94	* Interrupts must be disabled.
96	*	95	*
97	* @param as Address space.	96	* @param as Address space.
98	* @param lock If false, do not attempt to lock the address space.	97	* @param lock If false, do not attempt to lock the address space.
99	*/	98	*/
100	void ht_lock(as_t *as, bool lock)	99	void ht_lock(as_t *as, bool lock)
101	{	100	{
102	if (lock)	101	if (lock)
103	mutex_lock(&as->lock);	102	mutex_lock(&as->lock);
104	mutex_lock(&page_ht_lock);	103	mutex_lock(&page_ht_lock);
105	}	104	}
106		105
107	/** Unlock page table.	106	/** Unlock page table.
108	*	107	*
109	* Unlock address space and page hash table.	108	* Unlock address space and page hash table.
110	* Interrupts must be disabled.	109	* Interrupts must be disabled.
111	*	110	*
112	* @param as Address space.	111	* @param as Address space.
113	* @param unlock If false, do not attempt to lock the address space.	112	* @param unlock If false, do not attempt to lock the address space.
114	*/	113	*/
115	void ht_unlock(as_t *as, bool unlock)	114	void ht_unlock(as_t *as, bool unlock)
116	{	115	{
117	mutex_unlock(&page_ht_lock);	116	mutex_unlock(&page_ht_lock);
118	if (unlock)	117	if (unlock)
119	mutex_unlock(&as->lock);	118	mutex_unlock(&as->lock);
120	}	119	}
121		120
122	/** @}	121	/** @}
123	*/	122	*/
124		123
125		124

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/genarch/src/mm/as_ht.c @ 1637 – Rev 1702 → 1705