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.
 */
 
/**
 * @file    as_ht.c
 * @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 1380	Rev 1468
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	/**	29	/**
30	* @file as_ht.c	30	* @file as_ht.c
31	* @brief Address space functions for global page hash table.	31	* @brief Address space functions for global page hash table.
32	*/	32	*/
33		33
34	#include <genarch/mm/as_ht.h>	34	#include <genarch/mm/as_ht.h>
35	#include <genarch/mm/page_ht.h>	35	#include <genarch/mm/page_ht.h>
36	#include <mm/as.h>	36	#include <mm/as.h>
37	#include <mm/frame.h>	37	#include <mm/frame.h>
38	#include <arch/types.h>	38	#include <arch/types.h>
39	#include <typedefs.h>	39	#include <typedefs.h>
40	#include <memstr.h>	40	#include <memstr.h>
41	#include <adt/hash_table.h>	41	#include <adt/hash_table.h>
42	#include <synch/mutex.h>	42	#include <synch/mutex.h>
43		43
44	static pte_t *ht_create(int flags);	44	static pte_t *ht_create(int flags);
-		45	static void ht_destroy(pte_t *page_table);
45		46
46	static void ht_lock(as_t *as, bool lock);	47	static void ht_lock(as_t *as, bool lock);
47	static void ht_unlock(as_t *as, bool unlock);	48	static void ht_unlock(as_t *as, bool unlock);
48		49
49	as_operations_t as_ht_operations = {	50	as_operations_t as_ht_operations = {
50	.page_table_create = ht_create,	51	.page_table_create = ht_create,
-		52	.page_table_destroy = ht_destroy,
51	.page_table_lock = ht_lock,	53	.page_table_lock = ht_lock,
52	.page_table_unlock = ht_unlock,	54	.page_table_unlock = ht_unlock,
53	};	55	};
54		56
55		57
56	/** Page hash table create.	58	/** Page hash table create.
57	*	59	*
58	* The page hash table will be created only once	60	* The page hash table will be created only once
59	* and will be shared by all address spaces.	61	* and will be shared by all address spaces.
60	*	62	*
61	* @param flags Ignored.	63	* @param flags Ignored.
62	*	64	*
63	* @return Returns NULL.	65	* @return Returns NULL.
64	*/	66	*/
65	pte_t *ht_create(int flags)	67	pte_t *ht_create(int flags)
66	{	68	{
67	if (flags & FLAG_AS_KERNEL) {	69	if (flags & FLAG_AS_KERNEL) {
68	hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations);	70	hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations);
69	mutex_initialize(&page_ht_lock);	71	mutex_initialize(&page_ht_lock);
70	}	72	}
71	return NULL;	73	return NULL;
72	}	74	}
-		75
-		76	/** Destroy page table.
-		77	*
-		78	* Actually do nothing as the global page hash table is used.
-		79	*
-		80	* @param page_table This parameter is ignored.
-		81	*/
-		82	void ht_destroy(pte_t *page_table)
-		83	{
-		84	/* No-op. */
-		85	}
73		86
74	/** Lock page table.	87	/** Lock page table.
75	*	88	*
76	* Lock address space and page hash table.	89	* Lock address space and page hash table.
77	* Interrupts must be disabled.	90	* Interrupts must be disabled.
78	*	91	*
79	* @param as Address space.	92	* @param as Address space.
80	* @param lock If false, do not attempt to lock the address space.	93	* @param lock If false, do not attempt to lock the address space.
81	*/	94	*/
82	void ht_lock(as_t *as, bool lock)	95	void ht_lock(as_t *as, bool lock)
83	{	96	{
84	if (lock)	97	if (lock)
85	mutex_lock(&as->lock);	98	mutex_lock(&as->lock);
86	mutex_lock(&page_ht_lock);	99	mutex_lock(&page_ht_lock);
87	}	100	}
88		101
89	/** Unlock page table.	102	/** Unlock page table.
90	*	103	*
91	* Unlock address space and page hash table.	104	* Unlock address space and page hash table.
92	* Interrupts must be disabled.	105	* Interrupts must be disabled.
93	*	106	*
94	* @param as Address space.	107	* @param as Address space.
95	* @param unlock If false, do not attempt to lock the address space.	108	* @param unlock If false, do not attempt to lock the address space.
96	*/	109	*/
97	void ht_unlock(as_t *as, bool unlock)	110	void ht_unlock(as_t *as, bool unlock)
98	{	111	{
99	mutex_unlock(&page_ht_lock);	112	mutex_unlock(&page_ht_lock);
100	if (unlock)	113	if (unlock)
101	mutex_unlock(&as->lock);	114	mutex_unlock(&as->lock);
102	}	115	}
103		116

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/genarch/src/mm/as_ht.c – Rev 1380 → 1468