Subversion Repositories HelenOS-historic

Rev

Rev 1767 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
756 jermar 1 
/*
2 
 * Copyright (C) 2006 Jakub Jermar
3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
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
15 
 *   derived from this software without specific prior written permission.
16 
 *
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
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
28 
 
1702 cejka 29 
 /** @addtogroup genarchmm
30 
 * @{
31 
 */
32 
 
1266 jermar 33 
/**
1702 cejka 34 
 * @file
1266 jermar 35 
 * @brief	Address space functions for 4-level hierarchical pagetables.
36 
 */
37 
 
756 jermar 38 
#include <genarch/mm/page_pt.h>
39 
#include <mm/page.h>
40 
#include <mm/frame.h>
41 
#include <mm/as.h>
1380 jermar 42 
#include <synch/mutex.h>
756 jermar 43 
#include <arch/mm/page.h>
44 
#include <arch/mm/as.h>
45 
#include <arch/types.h>
46 
#include <typedefs.h>
47 
#include <memstr.h>
48 
#include <arch.h>
49 
 
50 
static pte_t *ptl0_create(int flags);
1468 jermar 51 
static void ptl0_destroy(pte_t *page_table);
756 jermar 52 
 
1044 jermar 53 
static void pt_lock(as_t *as, bool lock);
54 
static void pt_unlock(as_t *as, bool unlock);
55 
 
756 jermar 56 
as_operations_t as_pt_operations = {
1044 jermar 57 
	.page_table_create = ptl0_create,
1468 jermar 58 
	.page_table_destroy = ptl0_destroy,
1044 jermar 59 
	.page_table_lock = pt_lock,
60 
	.page_table_unlock = pt_unlock
756 jermar 61 
};
62 
 
63 
/** Create PTL0.
64 
 *
65 
 * PTL0 of 4-level page table will be created for each address space.
66 
 *
67 
 * @param flags Flags can specify whether ptl0 is for the kernel address space.
68 
 *
69 
 * @return New PTL0.
70 
 */
71 
pte_t *ptl0_create(int flags)
72 
{
73 
	pte_t *src_ptl0, *dst_ptl0;
74 
	ipl_t ipl;
75 
 
1767 palkovsky 76 
	dst_ptl0 = (pte_t *) frame_alloc(ONE_FRAME, FRAME_KA);
756 jermar 77 
 
78 
	if (flags & FLAG_AS_KERNEL) {
1780 jermar 79 
		memsetb((uintptr_t) dst_ptl0, PAGE_SIZE, 0);
756 jermar 80 
	} else {
1780 jermar 81 
		uintptr_t src, dst;
1059 jermar 82 
 
756 jermar 83 
		/*
84 
		 * Copy the kernel address space portion to new PTL0.
85 
		 */
86 
 
87 
		ipl = interrupts_disable();
1380 jermar 88 
		mutex_lock(&AS_KERNEL->lock);
1780 jermar 89 
		src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->page_table);
1059 jermar 90 
 
1780 jermar 91 
		src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
92 
		dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
1059 jermar 93 
 
1780 jermar 94 
		memsetb((uintptr_t) dst_ptl0, PAGE_SIZE, 0);
95 
		memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (uintptr_t) src_ptl0));
1380 jermar 96 
		mutex_unlock(&AS_KERNEL->lock);
756 jermar 97 
		interrupts_restore(ipl);
98 
	}
99 
 
1780 jermar 100 
	return (pte_t *) KA2PA((uintptr_t) dst_ptl0);
756 jermar 101 
}
1044 jermar 102 
 
1468 jermar 103 
/** Destroy page table.
104 
 *
105 
 * Destroy PTL0, other levels are expected to be already deallocated.
106 
 *
107 
 * @param page_table Physical address of PTL0.
108 
 */
109 
void ptl0_destroy(pte_t *page_table)
110 
{
1780 jermar 111 
	frame_free((uintptr_t)page_table);
1468 jermar 112 
}
113 
 
1044 jermar 114 
/** Lock page tables.
115 
 *
116 
 * Lock only the address space.
117 
 * Interrupts must be disabled.
118 
 *
119 
 * @param as Address space.
120 
 * @param lock If false, do not attempt to lock the address space.
121 
 */
122 
void pt_lock(as_t *as, bool lock)
123 
{
124 
	if (lock)
1380 jermar 125 
		mutex_lock(&as->lock);
1044 jermar 126 
}
127 
 
128 
/** Unlock page tables.
129 
 *
130 
 * Unlock the address space.
131 
 * Interrupts must be disabled.
132 
 *
133 
 * @param as Address space.
134 
 * @param unlock If false, do not attempt to unlock the address space.
135 
 */
136 
void pt_unlock(as_t *as, bool unlock)
137 
{
138 
	if (unlock)
1380 jermar 139 
		mutex_unlock(&as->lock);
1044 jermar 140 
}
1702 cejka 141 
 
142 
 /** @}
143 
 */
144