WebSVN – HelenOS – Diff – /trunk/kernel/genarch/src/mm/as_pt.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 4-level hierarchical pagetables.
 */
 
#include <genarch/mm/page_pt.h>
#include <mm/page.h>
#include <mm/frame.h>
#include <mm/as.h>
#include <synch/mutex.h>
#include <arch/mm/page.h>
#include <arch/mm/as.h>
#include <arch/types.h>
#include <memstr.h>
#include <arch.h>
 
static pte_t *ptl0_create(int flags);
static void ptl0_destroy(pte_t *page_table);
 
static void pt_lock(as_t *as, bool lock);
static void pt_unlock(as_t *as, bool unlock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
as_operations_t as_pt_operations = {
    .page_table_create = ptl0_create,
    .page_table_destroy = ptl0_destroy,
    .page_table_lock = pt_lock,
    .page_table_unlock = pt_unlock
};
 
 
/** Create PTL0.
 *
 * PTL0 of 4-level page table will be created for each address space.
 *
 * @param flags Flags can specify whether ptl0 is for the kernel address space.
 *
 * @return New PTL0.
 */
pte_t *ptl0_create(int flags)
{
    pte_t *src_ptl0, *dst_ptl0;
    ipl_t ipl;
    int table_size;
 
    dst_ptl0 = (pte_t *) frame_alloc(PTL0_SIZE, FRAME_KA);
    table_size = FRAME_SIZE << PTL0_SIZE;
 
    if (flags & FLAG_AS_KERNEL) {
        memsetb(dst_ptl0, table_size, 0);
    } else {
        uintptr_t src, dst;
   
        /*
         * Copy the kernel address space portion to new PTL0.
         */
         
        ipl = interrupts_disable();
        mutex_lock(&AS_KERNEL->lock);      
        src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->genarch.page_table);
 
        src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
        dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
 
        memsetb(dst_ptl0, table_size, 0);
        memcpy((void *) dst, (void *) src, table_size - (src - (uintptr_t) src_ptl0));
        mutex_unlock(&AS_KERNEL->lock);
        interrupts_restore(ipl);
    }
 
    return (pte_t *) KA2PA((uintptr_t) dst_ptl0);
}
 
/** Destroy page table.
 *
 * Destroy PTL0, other levels are expected to be already deallocated.
 *
 * @param page_table Physical address of PTL0.
 */
void ptl0_destroy(pte_t *page_table)
{
    frame_free((uintptr_t)page_table);
}
 
/** Lock page tables.
 *
 * Lock only the address space.
 * Interrupts must be disabled.
 *
 * @param as Address space.
 * @param lock If false, do not attempt to lock the address space.
 */
void pt_lock(as_t *as, bool lock)
{
    if (lock)
        mutex_lock(&as->lock);
}
 
/** Unlock page tables.
 *
 * Unlock the address space.
 * Interrupts must be disabled.
 *
 * @param as Address space.
 * @param unlock If false, do not attempt to unlock the address space.
 */
void pt_unlock(as_t *as, bool unlock)
{
    if (unlock)
        mutex_unlock(&as->lock);
}
 
/** @}
 */
 

Rev 3104	Rev 3240
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 Address space functions for 4-level hierarchical pagetables.	35	* @brief Address space functions for 4-level hierarchical pagetables.
36	*/	36	*/
37		37
38	#include <genarch/mm/page_pt.h>	38	#include <genarch/mm/page_pt.h>
39	#include <mm/page.h>	39	#include <mm/page.h>
40	#include <mm/frame.h>	40	#include <mm/frame.h>
41	#include <mm/as.h>	41	#include <mm/as.h>
42	#include <synch/mutex.h>	42	#include <synch/mutex.h>
43	#include <arch/mm/page.h>	43	#include <arch/mm/page.h>
44	#include <arch/mm/as.h>	44	#include <arch/mm/as.h>
45	#include <arch/types.h>	45	#include <arch/types.h>
46	#include <memstr.h>	46	#include <memstr.h>
47	#include <arch.h>	47	#include <arch.h>
48		48
49	static pte_t *ptl0_create(int flags);	49	static pte_t *ptl0_create(int flags);
50	static void ptl0_destroy(pte_t *page_table);	50	static void ptl0_destroy(pte_t *page_table);
51		51
52	static void pt_lock(as_t *as, bool lock);	52	static void pt_lock(as_t *as, bool lock);
53	static void pt_unlock(as_t *as, bool unlock);	53	static void pt_unlock(as_t *as, bool unlock);
54		54
55	#ifdef __OBJC__	-
56	@implementation as_t	-
57		-
58	+ (pte_t *) page_table_create: (int) flags	-
59	{	-
60	return ptl0_create(flags);	-
61	}	-
62		-
63	+ (void) page_table_destroy: (pte_t *) page_table	-
64	{	-
65	ptl0_destroy(page_table);	-
66	}	-
67		-
68	- (void) page_table_lock: (bool) _lock	-
69	{	-
70	pt_lock(self, _lock);	-
71	}	-
72		-
73	- (void) page_table_unlock: (bool) unlock	-
74	{	-
75	pt_unlock(self, unlock);	-
76	}	-
77		-
78	@end	-
79	#else	-
80	as_operations_t as_pt_operations = {	55	as_operations_t as_pt_operations = {
81	.page_table_create = ptl0_create,	56	.page_table_create = ptl0_create,
82	.page_table_destroy = ptl0_destroy,	57	.page_table_destroy = ptl0_destroy,
83	.page_table_lock = pt_lock,	58	.page_table_lock = pt_lock,
84	.page_table_unlock = pt_unlock	59	.page_table_unlock = pt_unlock
85	};	60	};
86	#endif	-
87		61
88	/** Create PTL0.	62	/** Create PTL0.
89	*	63	*
90	* PTL0 of 4-level page table will be created for each address space.	64	* PTL0 of 4-level page table will be created for each address space.
91	*	65	*
92	* @param flags Flags can specify whether ptl0 is for the kernel address space.	66	* @param flags Flags can specify whether ptl0 is for the kernel address space.
93	*	67	*
94	* @return New PTL0.	68	* @return New PTL0.
95	*/	69	*/
96	pte_t *ptl0_create(int flags)	70	pte_t *ptl0_create(int flags)
97	{	71	{
98	pte_t src_ptl0, dst_ptl0;	72	pte_t src_ptl0, dst_ptl0;
99	ipl_t ipl;	73	ipl_t ipl;
100	int table_size;	74	int table_size;
101		75
102	dst_ptl0 = (pte_t *) frame_alloc(PTL0_SIZE, FRAME_KA);	76	dst_ptl0 = (pte_t *) frame_alloc(PTL0_SIZE, FRAME_KA);
103	table_size = FRAME_SIZE << PTL0_SIZE;	77	table_size = FRAME_SIZE << PTL0_SIZE;
104		78
105	if (flags & FLAG_AS_KERNEL) {	79	if (flags & FLAG_AS_KERNEL) {
106	memsetb(dst_ptl0, table_size, 0);	80	memsetb(dst_ptl0, table_size, 0);
107	} else {	81	} else {
108	uintptr_t src, dst;	82	uintptr_t src, dst;
109		83
110	/*	84	/*
111	* Copy the kernel address space portion to new PTL0.	85	* Copy the kernel address space portion to new PTL0.
112	*/	86	*/
113		87
114	ipl = interrupts_disable();	88	ipl = interrupts_disable();
115	mutex_lock(&AS_KERNEL->lock);	89	mutex_lock(&AS_KERNEL->lock);
116	src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->genarch.page_table);	90	src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->genarch.page_table);
117		91
118	src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];	92	src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
119	dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];	93	dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
120		94
121	memsetb(dst_ptl0, table_size, 0);	95	memsetb(dst_ptl0, table_size, 0);
122	memcpy((void ) dst, (void ) src, table_size - (src - (uintptr_t) src_ptl0));	96	memcpy((void ) dst, (void ) src, table_size - (src - (uintptr_t) src_ptl0));
123	mutex_unlock(&AS_KERNEL->lock);	97	mutex_unlock(&AS_KERNEL->lock);
124	interrupts_restore(ipl);	98	interrupts_restore(ipl);
125	}	99	}
126		100
127	return (pte_t *) KA2PA((uintptr_t) dst_ptl0);	101	return (pte_t *) KA2PA((uintptr_t) dst_ptl0);
128	}	102	}
129		103
130	/** Destroy page table.	104	/** Destroy page table.
131	*	105	*
132	* Destroy PTL0, other levels are expected to be already deallocated.	106	* Destroy PTL0, other levels are expected to be already deallocated.
133	*	107	*
134	* @param page_table Physical address of PTL0.	108	* @param page_table Physical address of PTL0.
135	*/	109	*/
136	void ptl0_destroy(pte_t *page_table)	110	void ptl0_destroy(pte_t *page_table)
137	{	111	{
138	frame_free((uintptr_t)page_table);	112	frame_free((uintptr_t)page_table);
139	}	113	}
140		114
141	/** Lock page tables.	115	/** Lock page tables.
142	*	116	*
143	* Lock only the address space.	117	* Lock only the address space.
144	* Interrupts must be disabled.	118	* Interrupts must be disabled.
145	*	119	*
146	* @param as Address space.	120	* @param as Address space.
147	* @param lock If false, do not attempt to lock the address space.	121	* @param lock If false, do not attempt to lock the address space.
148	*/	122	*/
149	void pt_lock(as_t *as, bool lock)	123	void pt_lock(as_t *as, bool lock)
150	{	124	{
151	if (lock)	125	if (lock)
152	mutex_lock(&as->lock);	126	mutex_lock(&as->lock);
153	}	127	}
154		128
155	/** Unlock page tables.	129	/** Unlock page tables.
156	*	130	*
157	* Unlock the address space.	131	* Unlock the address space.
158	* Interrupts must be disabled.	132	* Interrupts must be disabled.
159	*	133	*
160	* @param as Address space.	134	* @param as Address space.
161	* @param unlock If false, do not attempt to unlock the address space.	135	* @param unlock If false, do not attempt to unlock the address space.
162	*/	136	*/
163	void pt_unlock(as_t *as, bool unlock)	137	void pt_unlock(as_t *as, bool unlock)
164	{	138	{
165	if (unlock)	139	if (unlock)
166	mutex_unlock(&as->lock);	140	mutex_unlock(&as->lock);
167	}	141	}
168		142
169	/** @}	143	/** @}
170	*/	144	*/
171		145

Subversion Repositories HelenOS

(root)/trunk/kernel/genarch/src/mm/as_pt.c – Rev 3104 → 3240