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;
 
    dst_ptl0 = (pte_t *) frame_alloc(ONE_FRAME, FRAME_KA);
 
    if (flags & FLAG_AS_KERNEL) {
        memsetb((uintptr_t) dst_ptl0, PAGE_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((uintptr_t) dst_ptl0, PAGE_SIZE, 0);
        memcpy((void *) dst, (void *) src, PAGE_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 2089	Rev 2106
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	as_operations_t as_pt_operations = {	55	as_operations_t as_pt_operations = {
56	.page_table_create = ptl0_create,	56	.page_table_create = ptl0_create,
57	.page_table_destroy = ptl0_destroy,	57	.page_table_destroy = ptl0_destroy,
58	.page_table_lock = pt_lock,	58	.page_table_lock = pt_lock,
59	.page_table_unlock = pt_unlock	59	.page_table_unlock = pt_unlock
60	};	60	};
61		61
62	/** Create PTL0.	62	/** Create PTL0.
63	*	63	*
64	* 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.
65	*	65	*
66	* @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.
67	*	67	*
68	* @return New PTL0.	68	* @return New PTL0.
69	*/	69	*/
70	pte_t *ptl0_create(int flags)	70	pte_t *ptl0_create(int flags)
71	{	71	{
72	pte_t src_ptl0, dst_ptl0;	72	pte_t src_ptl0, dst_ptl0;
73	ipl_t ipl;	73	ipl_t ipl;
74		74
75	dst_ptl0 = (pte_t *) frame_alloc(ONE_FRAME, FRAME_KA);	75	dst_ptl0 = (pte_t *) frame_alloc(ONE_FRAME, FRAME_KA);
76		76
77	if (flags & FLAG_AS_KERNEL) {	77	if (flags & FLAG_AS_KERNEL) {
78	memsetb((uintptr_t) dst_ptl0, PAGE_SIZE, 0);	78	memsetb((uintptr_t) dst_ptl0, PAGE_SIZE, 0);
79	} else {	79	} else {
80	uintptr_t src, dst;	80	uintptr_t src, dst;
81		81
82	/*	82	/*
83	* Copy the kernel address space portion to new PTL0.	83	* Copy the kernel address space portion to new PTL0.
84	*/	84	*/
85		85
86	ipl = interrupts_disable();	86	ipl = interrupts_disable();
87	mutex_lock(&AS_KERNEL->lock);	87	mutex_lock(&AS_KERNEL->lock);
88	src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->page_table);	88	src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->genarch.page_table);
89		89
90	src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];	90	src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
91	dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];	91	dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
92		92
93	memsetb((uintptr_t) dst_ptl0, PAGE_SIZE, 0);	93	memsetb((uintptr_t) dst_ptl0, PAGE_SIZE, 0);
94	memcpy((void ) dst, (void ) src, PAGE_SIZE - (src - (uintptr_t) src_ptl0));	94	memcpy((void ) dst, (void ) src, PAGE_SIZE - (src - (uintptr_t) src_ptl0));
95	mutex_unlock(&AS_KERNEL->lock);	95	mutex_unlock(&AS_KERNEL->lock);
96	interrupts_restore(ipl);	96	interrupts_restore(ipl);
97	}	97	}
98		98
99	return (pte_t *) KA2PA((uintptr_t) dst_ptl0);	99	return (pte_t *) KA2PA((uintptr_t) dst_ptl0);
100	}	100	}
101		101
102	/** Destroy page table.	102	/** Destroy page table.
103	*	103	*
104	* Destroy PTL0, other levels are expected to be already deallocated.	104	* Destroy PTL0, other levels are expected to be already deallocated.
105	*	105	*
106	* @param page_table Physical address of PTL0.	106	* @param page_table Physical address of PTL0.
107	*/	107	*/
108	void ptl0_destroy(pte_t *page_table)	108	void ptl0_destroy(pte_t *page_table)
109	{	109	{
110	frame_free((uintptr_t)page_table);	110	frame_free((uintptr_t)page_table);
111	}	111	}
112		112
113	/** Lock page tables.	113	/** Lock page tables.
114	*	114	*
115	* Lock only the address space.	115	* Lock only the address space.
116	* Interrupts must be disabled.	116	* Interrupts must be disabled.
117	*	117	*
118	* @param as Address space.	118	* @param as Address space.
119	* @param lock If false, do not attempt to lock the address space.	119	* @param lock If false, do not attempt to lock the address space.
120	*/	120	*/
121	void pt_lock(as_t *as, bool lock)	121	void pt_lock(as_t *as, bool lock)
122	{	122	{
123	if (lock)	123	if (lock)
124	mutex_lock(&as->lock);	124	mutex_lock(&as->lock);
125	}	125	}
126		126
127	/** Unlock page tables.	127	/** Unlock page tables.
128	*	128	*
129	* Unlock the address space.	129	* Unlock the address space.
130	* Interrupts must be disabled.	130	* Interrupts must be disabled.
131	*	131	*
132	* @param as Address space.	132	* @param as Address space.
133	* @param unlock If false, do not attempt to unlock the address space.	133	* @param unlock If false, do not attempt to unlock the address space.
134	*/	134	*/
135	void pt_unlock(as_t *as, bool unlock)	135	void pt_unlock(as_t *as, bool unlock)
136	{	136	{
137	if (unlock)	137	if (unlock)
138	mutex_unlock(&as->lock);	138	mutex_unlock(&as->lock);
139	}	139	}
140		140
141	/** @}	141	/** @}
142	*/	142	*/
143		143

Subversion Repositories HelenOS

(root)/trunk/kernel/genarch/src/mm/as_pt.c @ 2089 – Rev 2089 → 2106