Subversion Repositories HelenOS

Rev

Rev 195 | Rev 251 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2
 * Copyright (C) 2001-2004 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 <mm/page.h>
120 jermar 30
#include <mm/frame.h>
1 jermar 31
#include <arch/mm/page.h>
116 jermar 32
#include <arch/types.h>
33
#include <typedefs.h>
120 jermar 34
#include <arch/asm.h>
195 vana 35
#include <memstr.h>
1 jermar 36
 
195 vana 37
 
1 jermar 38
void page_init(void)
226 palkovsky 39
{
23 jermar 40
    page_arch_init();
1 jermar 41
    map_page_to_frame(0x0, 0x0, PAGE_NOT_PRESENT, 0);
42
}
116 jermar 43
 
44
/** Map memory structure
45
 *
46
 * Identity-map memory structure
47
 * considering possible crossings
48
 * of page boundaries.
49
 *
50
 * @param s Address of the structure.
51
 * @param size Size of the structure.
52
 */
53
void map_structure(__address s, size_t size)
54
{
55
    int i, cnt, length;
56
 
226 palkovsky 57
    length = size + (s - (s & ~(PAGE_SIZE-1)));
125 jermar 58
    cnt = length/PAGE_SIZE + (length%PAGE_SIZE>0);
116 jermar 59
 
125 jermar 60
    for (i = 0; i < cnt; i++)
61
        map_page_to_frame(s + i*PAGE_SIZE, s + i*PAGE_SIZE, PAGE_NOT_CACHEABLE, 0);
116 jermar 62
 
63
}
120 jermar 64
 
65
/** Map page to frame
66
 *
67
 * Map virtual address 'page' to physical address 'frame'
68
 * using 'flags'. Allocate and setup any missing page tables.
69
 *
70
 * @param page Virtual address of the page to be mapped.
71
 * @param frame Physical address of memory frame to which the mapping is done.
72
 * @param flags Flags to be used for mapping.
73
 * @param root Explicit PTL0 address.
74
 */
75
void map_page_to_frame(__address page, __address frame, int flags, __address root)
76
{
125 jermar 77
    pte_t *ptl0, *ptl1, *ptl2, *ptl3;
78
    __address newpt;
120 jermar 79
 
158 decky 80
    ptl0 = (pte_t *) PA2KA(root ? root : (__address) GET_PTL0_ADDRESS());
120 jermar 81
 
125 jermar 82
    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
83
        newpt = frame_alloc(FRAME_KA);
84
        memsetb(newpt, PAGE_SIZE, 0);
85
        SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));
86
        SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER);
87
    }
120 jermar 88
 
125 jermar 89
    ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
120 jermar 90
 
125 jermar 91
    if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {
92
        newpt = frame_alloc(FRAME_KA);
93
        memsetb(newpt, PAGE_SIZE, 0);
94
        SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));
95
        SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER);
96
    }
120 jermar 97
 
125 jermar 98
    ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
120 jermar 99
 
125 jermar 100
    if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {
101
        newpt = frame_alloc(FRAME_KA);
102
        memsetb(newpt, PAGE_SIZE, 0);
103
        SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));
104
        SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER);
105
    }
120 jermar 106
 
125 jermar 107
    ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
120 jermar 108
 
125 jermar 109
    SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(page), frame);
110
    SET_FRAME_FLAGS(ptl3, PTL3_INDEX(page), flags);
120 jermar 111
}