Subversion Repositories HelenOS

Rev

Rev 1266 | Rev 1468 | Go to most recent revision | 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
 
1266 jermar 29
/**
30
 * @file    as_pt.c
31
 * @brief   Address space functions for 4-level hierarchical pagetables.
32
 */
33
 
756 jermar 34
#include <genarch/mm/page_pt.h>
35
#include <mm/page.h>
36
#include <mm/frame.h>
37
#include <mm/as.h>
1380 jermar 38
#include <synch/mutex.h>
756 jermar 39
#include <arch/mm/page.h>
40
#include <arch/mm/as.h>
41
#include <arch/types.h>
42
#include <typedefs.h>
43
#include <memstr.h>
44
#include <arch.h>
45
 
46
static pte_t *ptl0_create(int flags);
47
 
1044 jermar 48
static void pt_lock(as_t *as, bool lock);
49
static void pt_unlock(as_t *as, bool unlock);
50
 
756 jermar 51
as_operations_t as_pt_operations = {
1044 jermar 52
    .page_table_create = ptl0_create,
53
    .page_table_lock = pt_lock,
54
    .page_table_unlock = pt_unlock
756 jermar 55
};
56
 
57
/** Create PTL0.
58
 *
59
 * PTL0 of 4-level page table will be created for each address space.
60
 *
61
 * @param flags Flags can specify whether ptl0 is for the kernel address space.
62
 *
63
 * @return New PTL0.
64
 */
65
pte_t *ptl0_create(int flags)
66
{
67
    pte_t *src_ptl0, *dst_ptl0;
68
    ipl_t ipl;
69
 
814 palkovsky 70
    dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC)));
756 jermar 71
 
72
    if (flags & FLAG_AS_KERNEL) {
73
        memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
74
    } else {
1059 jermar 75
        __address src, dst;
76
 
756 jermar 77
        /*
78
         * Copy the kernel address space portion to new PTL0.
79
         */
80
 
81
        ipl = interrupts_disable();
1380 jermar 82
        mutex_lock(&AS_KERNEL->lock);      
756 jermar 83
        src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);
1059 jermar 84
 
85
        src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
86
        dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
87
 
88
        memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
89
        memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0));
1380 jermar 90
        mutex_unlock(&AS_KERNEL->lock);
756 jermar 91
        interrupts_restore(ipl);
92
    }
93
 
94
    return (pte_t *) KA2PA((__address) dst_ptl0);
95
}
1044 jermar 96
 
97
/** Lock page tables.
98
 *
99
 * Lock only the address space.
100
 * Interrupts must be disabled.
101
 *
102
 * @param as Address space.
103
 * @param lock If false, do not attempt to lock the address space.
104
 */
105
void pt_lock(as_t *as, bool lock)
106
{
107
    if (lock)
1380 jermar 108
        mutex_lock(&as->lock);
1044 jermar 109
}
110
 
111
/** Unlock page tables.
112
 *
113
 * Unlock the address space.
114
 * Interrupts must be disabled.
115
 *
116
 * @param as Address space.
117
 * @param unlock If false, do not attempt to unlock the address space.
118
 */
119
void pt_unlock(as_t *as, bool unlock)
120
{
121
    if (unlock)
1380 jermar 122
        mutex_unlock(&as->lock);
1044 jermar 123
}