WebSVN – HelenOS-historic – Diff – /kernel/trunk/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.
 */
 
#include <genarch/mm/page_pt.h>
#include <mm/page.h>
#include <mm/frame.h>
#include <mm/as.h>
#include <arch/mm/page.h>
#include <arch/mm/as.h>
#include <arch/types.h>
#include <typedefs.h>
#include <memstr.h>
#include <arch.h>
 
static pte_t *ptl0_create(int flags);
 
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_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;
 
    dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC)));
 
    if (flags & FLAG_AS_KERNEL) {
        memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
    } else {
        __address src, dst;
   
        /*
         * Copy the kernel address space portion to new PTL0.
 
         */
         
        ipl = interrupts_disable();
        spinlock_lock(&AS_KERNEL->lock);       
        src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);
 
        src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
        dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
 
        memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
        memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0));
        spinlock_unlock(&AS_KERNEL->lock);
        interrupts_restore(ipl);
    }
 
    return (pte_t *) KA2PA((__address) dst_ptl0);
}
 
/** 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)
        spinlock_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)
        spinlock_unlock(&as->lock);
}
 

Rev 1044	Rev 1059
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	#include <genarch/mm/page_pt.h>	29	#include <genarch/mm/page_pt.h>
30	#include <mm/page.h>	30	#include <mm/page.h>
31	#include <mm/frame.h>	31	#include <mm/frame.h>
32	#include <mm/as.h>	32	#include <mm/as.h>
33	#include <arch/mm/page.h>	33	#include <arch/mm/page.h>
34	#include <arch/mm/as.h>	34	#include <arch/mm/as.h>
35	#include <arch/types.h>	35	#include <arch/types.h>
36	#include <typedefs.h>	36	#include <typedefs.h>
37	#include <memstr.h>	37	#include <memstr.h>
38	#include <arch.h>	38	#include <arch.h>
39		39
40	static pte_t *ptl0_create(int flags);	40	static pte_t *ptl0_create(int flags);
41		41
42	static void pt_lock(as_t *as, bool lock);	42	static void pt_lock(as_t *as, bool lock);
43	static void pt_unlock(as_t *as, bool unlock);	43	static void pt_unlock(as_t *as, bool unlock);
44		44
45	as_operations_t as_pt_operations = {	45	as_operations_t as_pt_operations = {
46	.page_table_create = ptl0_create,	46	.page_table_create = ptl0_create,
47	.page_table_lock = pt_lock,	47	.page_table_lock = pt_lock,
48	.page_table_unlock = pt_unlock	48	.page_table_unlock = pt_unlock
49	};	49	};
50		50
51	/** Create PTL0.	51	/** Create PTL0.
52	*	52	*
53	* PTL0 of 4-level page table will be created for each address space.	53	* PTL0 of 4-level page table will be created for each address space.
54	*	54	*
55	* @param flags Flags can specify whether ptl0 is for the kernel address space.	55	* @param flags Flags can specify whether ptl0 is for the kernel address space.
56	*	56	*
57	* @return New PTL0.	57	* @return New PTL0.
58	*/	58	*/
59	pte_t *ptl0_create(int flags)	59	pte_t *ptl0_create(int flags)
60	{	60	{
61	pte_t src_ptl0, dst_ptl0;	61	pte_t src_ptl0, dst_ptl0;
62	ipl_t ipl;	62	ipl_t ipl;
63		63
64	dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA \| FRAME_PANIC)));	64	dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA \| FRAME_PANIC)));
65		65
66	if (flags & FLAG_AS_KERNEL) {	66	if (flags & FLAG_AS_KERNEL) {
67	memsetb((__address) dst_ptl0, PAGE_SIZE, 0);	67	memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
68	} else {	68	} else {
-		69	__address src, dst;
-		70
69	/*	71	/*
70	* Copy the kernel address space portion to new PTL0.	72	* Copy the kernel address space portion to new PTL0.
71	* TODO: copy only kernel address space.	-
72	*/	73	*/
73		74
74	ipl = interrupts_disable();	75	ipl = interrupts_disable();
75	spinlock_lock(&AS_KERNEL->lock);	76	spinlock_lock(&AS_KERNEL->lock);
76	src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);	77	src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);
-		78
-		79	src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
-		80	dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
-		81
77	memcpy((void ) dst_ptl0,(void ) src_ptl0, PAGE_SIZE);	82	memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
-		83	memcpy((void ) dst, (void ) src, PAGE_SIZE - (src - (__address) src_ptl0));
78	spinlock_unlock(&AS_KERNEL->lock);	84	spinlock_unlock(&AS_KERNEL->lock);
79	interrupts_restore(ipl);	85	interrupts_restore(ipl);
80	}	86	}
81		87
82	return (pte_t *) KA2PA((__address) dst_ptl0);	88	return (pte_t *) KA2PA((__address) dst_ptl0);
83	}	89	}
84		90
85	/** Lock page tables.	91	/** Lock page tables.
86	*	92	*
87	* Lock only the address space.	93	* Lock only the address space.
88	* Interrupts must be disabled.	94	* Interrupts must be disabled.
89	*	95	*
90	* @param as Address space.	96	* @param as Address space.
91	* @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.
92	*/	98	*/
93	void pt_lock(as_t *as, bool lock)	99	void pt_lock(as_t *as, bool lock)
94	{	100	{
95	if (lock)	101	if (lock)
96	spinlock_lock(&as->lock);	102	spinlock_lock(&as->lock);
97	}	103	}
98		104
99	/** Unlock page tables.	105	/** Unlock page tables.
100	*	106	*
101	* Unlock the address space.	107	* Unlock the address space.
102	* Interrupts must be disabled.	108	* Interrupts must be disabled.
103	*	109	*
104	* @param as Address space.	110	* @param as Address space.
105	* @param unlock If false, do not attempt to unlock the address space.	111	* @param unlock If false, do not attempt to unlock the address space.
106	*/	112	*/
107	void pt_unlock(as_t *as, bool unlock)	113	void pt_unlock(as_t *as, bool unlock)
108	{	114	{
109	if (unlock)	115	if (unlock)
110	spinlock_unlock(&as->lock);	116	spinlock_unlock(&as->lock);
111	}	117	}
112		118

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/genarch/src/mm/as_pt.c – Rev 1044 → 1059