Subversion Repositories HelenOS-historic

Rev

Rev 762 | Rev 814 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
684 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
 
29
#include <genarch/mm/page_pt.h>
30
#include <mm/page.h>
31
#include <mm/frame.h>
756 jermar 32
#include <mm/as.h>
684 jermar 33
#include <arch/mm/page.h>
755 jermar 34
#include <arch/mm/as.h>
684 jermar 35
#include <arch/types.h>
36
#include <typedefs.h>
37
#include <arch/asm.h>
38
#include <memstr.h>
39
 
756 jermar 40
static void pt_mapping_insert(as_t *as, __address page, __address frame, int flags);
41
static pte_t *pt_mapping_find(as_t *as, __address page);
684 jermar 42
 
43
page_operations_t page_pt_operations = {
44
    .mapping_insert = pt_mapping_insert,
45
    .mapping_find = pt_mapping_find
46
};
47
 
48
/** Map page to frame using hierarchical page tables.
49
 *
50
 * Map virtual address 'page' to physical address 'frame'
51
 * using 'flags'.
52
 *
756 jermar 53
 * The address space must be locked and interrupts must be disabled.
54
 *
55
 * @param as Address space to wich page belongs.
684 jermar 56
 * @param page Virtual address of the page to be mapped.
57
 * @param frame Physical address of memory frame to which the mapping is done.
58
 * @param flags Flags to be used for mapping.
59
 */
756 jermar 60
void pt_mapping_insert(as_t *as, __address page, __address frame, int flags)
684 jermar 61
{
62
    pte_t *ptl0, *ptl1, *ptl2, *ptl3;
63
    __address newpt;
64
 
756 jermar 65
    ptl0 = (pte_t *) PA2KA((__address) as->page_table);
684 jermar 66
 
67
    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
786 bondari 68
        newpt = frame_alloc(ONE_FRAME, FRAME_KA);
684 jermar 69
        memsetb(newpt, PAGE_SIZE, 0);
70
        SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));
71
        SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
72
    }
73
 
74
    ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
75
 
76
    if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {
786 bondari 77
        newpt = frame_alloc(ONE_FRAME, FRAME_KA);
684 jermar 78
        memsetb(newpt, PAGE_SIZE, 0);
79
        SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));
80
        SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
81
    }
82
 
83
    ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
84
 
85
    if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {
786 bondari 86
        newpt = frame_alloc(ONE_FRAME, FRAME_KA);
684 jermar 87
        memsetb(newpt, PAGE_SIZE, 0);
88
        SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));
89
        SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
90
    }
91
 
92
    ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
93
 
94
    SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(page), frame);
95
    SET_FRAME_FLAGS(ptl3, PTL3_INDEX(page), flags);
96
}
97
 
98
/** Find mapping for virtual page in hierarchical page tables.
99
 *
100
 * Find mapping for virtual page.
101
 *
756 jermar 102
 * The address space must be locked and interrupts must be disabled.
103
 *
104
 * @param as Address space to which page belongs.
684 jermar 105
 * @param page Virtual page.
106
 *
107
 * @return NULL if there is no such mapping; entry from PTL3 describing the mapping otherwise.
108
 */
756 jermar 109
pte_t *pt_mapping_find(as_t *as, __address page)
684 jermar 110
{
111
    pte_t *ptl0, *ptl1, *ptl2, *ptl3;
112
 
756 jermar 113
    ptl0 = (pte_t *) PA2KA((__address) as->page_table);
684 jermar 114
 
115
    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT)
116
        return NULL;
117
 
118
    ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
119
 
120
    if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT)
121
        return NULL;
122
 
123
    ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
124
 
125
    if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT)
126
        return NULL;
127
 
128
    ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
129
 
130
    return &ptl3[PTL3_INDEX(page)];
131
}