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);
 
as_operations_t as_pt_operations = {
    .page_table_create = ptl0_create
};
 
/** 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 *) frame_alloc(FRAME_KA | FRAME_PANIC, ONE_FRAME, NULL, NULL);
 
    if (flags & FLAG_AS_KERNEL) {
        memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
    } else {
        /*
         * Copy the kernel address space portion to new PTL0.
         * TODO: copy only kernel address space.
         */
         
        ipl = interrupts_disable();
        spinlock_lock(&AS_KERNEL->lock);
        src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);
        memcpy((void *) dst_ptl0,(void *) src_ptl0, PAGE_SIZE);
        spinlock_unlock(&AS_KERNEL->lock);
        interrupts_restore(ipl);
    }
 
    return (pte_t *) KA2PA((__address) dst_ptl0);
}
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/genarch/src/mm/as_pt.c – Rev 756 → 762

Rev 756		Rev 762
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	as_operations_t as_pt_operations = {	42	as_operations_t as_pt_operations = {
43	.page_table_create = ptl0_create	43	.page_table_create = ptl0_create
44	};	44	};
45		45
46	/** Create PTL0.	46	/** Create PTL0.
47	*	47	*
48	* PTL0 of 4-level page table will be created for each address space.	48	* PTL0 of 4-level page table will be created for each address space.
49	*	49	*
50	* @param flags Flags can specify whether ptl0 is for the kernel address space.	50	* @param flags Flags can specify whether ptl0 is for the kernel address space.
51	*	51	*
52	* @return New PTL0.	52	* @return New PTL0.
53	*/	53	*/
54	pte_t *ptl0_create(int flags)	54	pte_t *ptl0_create(int flags)
55	{	55	{
56	pte_t src_ptl0, dst_ptl0;	56	pte_t src_ptl0, dst_ptl0;
57	ipl_t ipl;	57	ipl_t ipl;
58		58
59	dst_ptl0 = (pte_t *) frame_alloc(FRAME_KA \| FRAME_PANIC, ONE_FRAME, NULL);	59	dst_ptl0 = (pte_t *) frame_alloc(FRAME_KA \| FRAME_PANIC, ONE_FRAME, NULL, NULL);
60		60
61	if (flags & FLAG_AS_KERNEL) {	61	if (flags & FLAG_AS_KERNEL) {
62	memsetb((__address) dst_ptl0, PAGE_SIZE, 0);	62	memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
63	} else {	63	} else {
64	/*	64	/*
65	* Copy the kernel address space portion to new PTL0.	65	* Copy the kernel address space portion to new PTL0.
66	* TODO: copy only kernel address space.	66	* TODO: copy only kernel address space.
67	*/	67	*/
68		68
69	ipl = interrupts_disable();	69	ipl = interrupts_disable();
70	spinlock_lock(&AS_KERNEL->lock);	70	spinlock_lock(&AS_KERNEL->lock);
71	src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);	71	src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);
72	memcpy((void ) dst_ptl0,(void ) src_ptl0, PAGE_SIZE);	72	memcpy((void ) dst_ptl0,(void ) src_ptl0, PAGE_SIZE);
73	spinlock_unlock(&AS_KERNEL->lock);	73	spinlock_unlock(&AS_KERNEL->lock);
74	interrupts_restore(ipl);	74	interrupts_restore(ipl);
75	}	75	}
76		76
77	return (pte_t *) KA2PA((__address) dst_ptl0);	77	return (pte_t *) KA2PA((__address) dst_ptl0);
78	}	78	}
79		79