WebSVN – HelenOS – Diff – /tags/0.2.0.1/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.
 */
 
/**
 * @file    as_pt.c
 * @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 <typedefs.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;
 
    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();
        mutex_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));
        mutex_unlock(&AS_KERNEL->lock);
        interrupts_restore(ipl);
    }
 
    return (pte_t *) KA2PA((__address) 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(ADDR2PFN((__address) 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 1965	Rev 1968
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_pt.c	30	* @file as_pt.c
31	* @brief Address space functions for 4-level hierarchical pagetables.	31	* @brief Address space functions for 4-level hierarchical pagetables.
32	*/	32	*/
33		33
34	#include <genarch/mm/page_pt.h>	34	#include <genarch/mm/page_pt.h>
35	#include <mm/page.h>	35	#include <mm/page.h>
36	#include <mm/frame.h>	36	#include <mm/frame.h>
37	#include <mm/as.h>	37	#include <mm/as.h>
38	#include <synch/mutex.h>	38	#include <synch/mutex.h>
39	#include <arch/mm/page.h>	39	#include <arch/mm/page.h>
40	#include <arch/mm/as.h>	40	#include <arch/mm/as.h>
41	#include <arch/types.h>	41	#include <arch/types.h>
42	#include <typedefs.h>	42	#include <typedefs.h>
43	#include <memstr.h>	43	#include <memstr.h>
44	#include <arch.h>	44	#include <arch.h>
45		45
46	static pte_t *ptl0_create(int flags);	46	static pte_t *ptl0_create(int flags);
47	static void ptl0_destroy(pte_t *page_table);	47	static void ptl0_destroy(pte_t *page_table);
48		48
49	static void pt_lock(as_t *as, bool lock);	49	static void pt_lock(as_t *as, bool lock);
50	static void pt_unlock(as_t *as, bool unlock);	50	static void pt_unlock(as_t *as, bool unlock);
51		51
52	as_operations_t as_pt_operations = {	52	as_operations_t as_pt_operations = {
53	.page_table_create = ptl0_create,	53	.page_table_create = ptl0_create,
54	.page_table_destroy = ptl0_destroy,	54	.page_table_destroy = ptl0_destroy,
55	.page_table_lock = pt_lock,	55	.page_table_lock = pt_lock,
56	.page_table_unlock = pt_unlock	56	.page_table_unlock = pt_unlock
57	};	57	};
58		58
59	/** Create PTL0.	59	/** Create PTL0.
60	*	60	*
61	* PTL0 of 4-level page table will be created for each address space.	61	* PTL0 of 4-level page table will be created for each address space.
62	*	62	*
63	* @param flags Flags can specify whether ptl0 is for the kernel address space.	63	* @param flags Flags can specify whether ptl0 is for the kernel address space.
64	*	64	*
65	* @return New PTL0.	65	* @return New PTL0.
66	*/	66	*/
67	pte_t *ptl0_create(int flags)	67	pte_t *ptl0_create(int flags)
68	{	68	{
69	pte_t src_ptl0, dst_ptl0;	69	pte_t src_ptl0, dst_ptl0;
70	ipl_t ipl;	70	ipl_t ipl;
71		71
72	dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA \| FRAME_PANIC)));	72	dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA \| FRAME_PANIC)));
73		73
74	if (flags & FLAG_AS_KERNEL) {	74	if (flags & FLAG_AS_KERNEL) {
75	memsetb((__address) dst_ptl0, PAGE_SIZE, 0);	75	memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
76	} else {	76	} else {
77	__address src, dst;	77	__address src, dst;
78		78
79	/*	79	/*
80	* Copy the kernel address space portion to new PTL0.	80	* Copy the kernel address space portion to new PTL0.
81	*/	81	*/
82		82
83	ipl = interrupts_disable();	83	ipl = interrupts_disable();
84	mutex_lock(&AS_KERNEL->lock);	84	mutex_lock(&AS_KERNEL->lock);
85	src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);	85	src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);
86		86
87	src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];	87	src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
88	dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];	88	dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
89		89
90	memsetb((__address) dst_ptl0, PAGE_SIZE, 0);	90	memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
91	memcpy((void ) dst, (void ) src, PAGE_SIZE - (src - (__address) src_ptl0));	91	memcpy((void ) dst, (void ) src, PAGE_SIZE - (src - (__address) src_ptl0));
92	mutex_unlock(&AS_KERNEL->lock);	92	mutex_unlock(&AS_KERNEL->lock);
93	interrupts_restore(ipl);	93	interrupts_restore(ipl);
94	}	94	}
95		95
96	return (pte_t *) KA2PA((__address) dst_ptl0);	96	return (pte_t *) KA2PA((__address) dst_ptl0);
97	}	97	}
98		98
99	/** Destroy page table.	99	/** Destroy page table.
100	*	100	*
101	* Destroy PTL0, other levels are expected to be already deallocated.	101	* Destroy PTL0, other levels are expected to be already deallocated.
102	*	102	*
103	* @param page_table Physical address of PTL0.	103	* @param page_table Physical address of PTL0.
104	*/	104	*/
105	void ptl0_destroy(pte_t *page_table)	105	void ptl0_destroy(pte_t *page_table)
106	{	106	{
107	frame_free(ADDR2PFN((__address) page_table));	107	frame_free(ADDR2PFN((__address) page_table));
108	}	108	}
109		109
110	/** Lock page tables.	110	/** Lock page tables.
111	*	111	*
112	* Lock only the address space.	112	* Lock only the address space.
113	* Interrupts must be disabled.	113	* Interrupts must be disabled.
114	*	114	*
115	* @param as Address space.	115	* @param as Address space.
116	* @param lock If false, do not attempt to lock the address space.	116	* @param lock If false, do not attempt to lock the address space.
117	*/	117	*/
118	void pt_lock(as_t *as, bool lock)	118	void pt_lock(as_t *as, bool lock)
119	{	119	{
120	if (lock)	120	if (lock)
121	mutex_lock(&as->lock);	121	mutex_lock(&as->lock);
122	}	122	}
123		123
124	/** Unlock page tables.	124	/** Unlock page tables.
125	*	125	*
126	* Unlock the address space.	126	* Unlock the address space.
127	* Interrupts must be disabled.	127	* Interrupts must be disabled.
128	*	128	*
129	* @param as Address space.	129	* @param as Address space.
130	* @param unlock If false, do not attempt to unlock the address space.	130	* @param unlock If false, do not attempt to unlock the address space.
131	*/	131	*/
132	void pt_unlock(as_t *as, bool unlock)	132	void pt_unlock(as_t *as, bool unlock)
133	{	133	{
134	if (unlock)	134	if (unlock)
135	mutex_unlock(&as->lock);	135	mutex_unlock(&as->lock);
136	}	136	}
137		137

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(root)/tags/0.2.0.1/kernel/genarch/src/mm/as_pt.c – Rev 1965 → 1968