Subversion Repositories HelenOS

Rev

Rev 2465 | Rev 3153 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
756 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Jakub Jermar
756 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
 
1851 jermar 29
/** @addtogroup genarchmm
1702 cejka 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 <memstr.h>
47
#include <arch.h>
48
 
49
static pte_t *ptl0_create(int flags);
1468 jermar 50
static void ptl0_destroy(pte_t *page_table);
756 jermar 51
 
1044 jermar 52
static void pt_lock(as_t *as, bool lock);
53
static void pt_unlock(as_t *as, bool unlock);
54
 
2125 decky 55
#ifdef __OBJC__
56
@implementation as_t
57
 
58
+ (pte_t *) page_table_create: (int) flags
59
{
60
    return ptl0_create(flags);
61
}
62
 
63
+ (void) page_table_destroy: (pte_t *) page_table
64
{
65
    ptl0_destroy(page_table);
66
}
67
 
68
- (void) page_table_lock: (bool) _lock
69
{
70
    pt_lock(self, _lock);
71
}
72
 
73
- (void) page_table_unlock: (bool) unlock
74
{
75
    pt_unlock(self, unlock);
76
}
77
 
78
@end
79
#else
756 jermar 80
as_operations_t as_pt_operations = {
1044 jermar 81
    .page_table_create = ptl0_create,
1468 jermar 82
    .page_table_destroy = ptl0_destroy,
1044 jermar 83
    .page_table_lock = pt_lock,
84
    .page_table_unlock = pt_unlock
756 jermar 85
};
2125 decky 86
#endif
756 jermar 87
 
88
/** Create PTL0.
89
 *
90
 * PTL0 of 4-level page table will be created for each address space.
91
 *
92
 * @param flags Flags can specify whether ptl0 is for the kernel address space.
93
 *
94
 * @return New PTL0.
95
 */
96
pte_t *ptl0_create(int flags)
97
{
98
    pte_t *src_ptl0, *dst_ptl0;
99
    ipl_t ipl;
2465 jermar 100
    int table_size;
756 jermar 101
 
2465 jermar 102
    dst_ptl0 = (pte_t *) frame_alloc(PTL0_SIZE, FRAME_KA);
103
    table_size = FRAME_SIZE << PTL0_SIZE;
756 jermar 104
 
105
    if (flags & FLAG_AS_KERNEL) {
2465 jermar 106
        memsetb((uintptr_t) dst_ptl0, table_size, 0);
756 jermar 107
    } else {
1780 jermar 108
        uintptr_t src, dst;
1059 jermar 109
 
756 jermar 110
        /*
111
         * Copy the kernel address space portion to new PTL0.
112
         */
113
 
114
        ipl = interrupts_disable();
1380 jermar 115
        mutex_lock(&AS_KERNEL->lock);      
2106 jermar 116
        src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->genarch.page_table);
1059 jermar 117
 
1780 jermar 118
        src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
119
        dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
1059 jermar 120
 
2465 jermar 121
        memsetb((uintptr_t) dst_ptl0, table_size, 0);
122
        memcpy((void *) dst, (void *) src, table_size - (src - (uintptr_t) src_ptl0));
1380 jermar 123
        mutex_unlock(&AS_KERNEL->lock);
756 jermar 124
        interrupts_restore(ipl);
125
    }
126
 
1780 jermar 127
    return (pte_t *) KA2PA((uintptr_t) dst_ptl0);
756 jermar 128
}
1044 jermar 129
 
1468 jermar 130
/** Destroy page table.
131
 *
132
 * Destroy PTL0, other levels are expected to be already deallocated.
133
 *
134
 * @param page_table Physical address of PTL0.
135
 */
136
void ptl0_destroy(pte_t *page_table)
137
{
1780 jermar 138
    frame_free((uintptr_t)page_table);
1468 jermar 139
}
140
 
1044 jermar 141
/** Lock page tables.
142
 *
143
 * Lock only the address space.
144
 * Interrupts must be disabled.
145
 *
146
 * @param as Address space.
147
 * @param lock If false, do not attempt to lock the address space.
148
 */
149
void pt_lock(as_t *as, bool lock)
150
{
151
    if (lock)
1380 jermar 152
        mutex_lock(&as->lock);
1044 jermar 153
}
154
 
155
/** Unlock page tables.
156
 *
157
 * Unlock the address space.
158
 * Interrupts must be disabled.
159
 *
160
 * @param as Address space.
161
 * @param unlock If false, do not attempt to unlock the address space.
162
 */
163
void pt_unlock(as_t *as, bool unlock)
164
{
165
    if (unlock)
1380 jermar 166
        mutex_unlock(&as->lock);
1044 jermar 167
}
1702 cejka 168
 
1851 jermar 169
/** @}
1702 cejka 170
 */