Subversion Repositories HelenOS

Rev

Rev 2927 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 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
 
1888 jermar 29
/** @addtogroup ia32mm 
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1888 jermar 35
#ifndef KERN_ia32_PAGE_H_
36
#define KERN_ia32_PAGE_H_
1 jermar 37
 
967 palkovsky 38
#include <arch/mm/frame.h>
39
 
765 jermar 40
#define PAGE_WIDTH  FRAME_WIDTH
1 jermar 41
#define PAGE_SIZE   FRAME_SIZE
42
 
2007 jermar 43
#define PAGE_COLOR_BITS 0           /* dummy */
44
 
967 palkovsky 45
#ifdef KERNEL
46
 
300 palkovsky 47
#ifndef __ASM__
1780 jermar 48
#   define KA2PA(x) (((uintptr_t) (x)) - 0x80000000)
49
#   define PA2KA(x) (((uintptr_t) (x)) + 0x80000000)
300 palkovsky 50
#else
957 decky 51
#   define KA2PA(x) ((x) - 0x80000000)
52
#   define PA2KA(x) ((x) + 0x80000000)
300 palkovsky 53
#endif
1 jermar 54
 
119 jermar 55
/*
56
 * Implementation of generic 4-level page table interface.
57
 * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.
58
 */
2467 jermar 59
 
60
/* Number of entries in each level. */
832 jermar 61
#define PTL0_ENTRIES_ARCH   1024
62
#define PTL1_ENTRIES_ARCH   0
63
#define PTL2_ENTRIES_ARCH   0
64
#define PTL3_ENTRIES_ARCH   1024
65
 
2467 jermar 66
/* Page table sizes for each level. */
67
#define PTL0_SIZE_ARCH      ONE_FRAME
68
#define PTL1_SIZE_ARCH      0
69
#define PTL2_SIZE_ARCH      0
70
#define PTL3_SIZE_ARCH      ONE_FRAME
2465 jermar 71
 
2467 jermar 72
/* Macros calculating indices for each level. */
2089 decky 73
#define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)
119 jermar 74
#define PTL1_INDEX_ARCH(vaddr)  0
75
#define PTL2_INDEX_ARCH(vaddr)  0
2089 decky 76
#define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)
119 jermar 77
 
2467 jermar 78
/* Get PTE address accessors for each level. */
79
#define GET_PTL1_ADDRESS_ARCH(ptl0, i) \
80
    ((pte_t *) ((((pte_t *) (ptl0))[(i)].frame_address) << 12))
81
#define GET_PTL2_ADDRESS_ARCH(ptl1, i) \
82
    (ptl1)
83
#define GET_PTL3_ADDRESS_ARCH(ptl2, i) \
84
    (ptl2)
85
#define GET_FRAME_ADDRESS_ARCH(ptl3, i) \
86
    ((uintptr_t) ((((pte_t *) (ptl3))[(i)].frame_address) << 12))
119 jermar 87
 
2467 jermar 88
/* Set PTE address accessors for each level. */
89
#define SET_PTL0_ADDRESS_ARCH(ptl0) \
90
    (write_cr3((uintptr_t) (ptl0)))
91
#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \
92
    (((pte_t *) (ptl0))[(i)].frame_address = (a) >> 12)
120 jermar 93
#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
94
#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
2467 jermar 95
#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \
96
    (((pte_t *) (ptl3))[(i)].frame_address = (a) >> 12)
119 jermar 97
 
2467 jermar 98
/* Get PTE flags accessors for each level. */
99
#define GET_PTL1_FLAGS_ARCH(ptl0, i) \
100
    get_pt_flags((pte_t *) (ptl0), (index_t) (i))
101
#define GET_PTL2_FLAGS_ARCH(ptl1, i) \
102
    PAGE_PRESENT
103
#define GET_PTL3_FLAGS_ARCH(ptl2, i) \
104
    PAGE_PRESENT
105
#define GET_FRAME_FLAGS_ARCH(ptl3, i) \
106
    get_pt_flags((pte_t *) (ptl3), (index_t) (i))
120 jermar 107
 
2467 jermar 108
/* Set PTE flags accessors for each level. */
109
#define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \
110
    set_pt_flags((pte_t *) (ptl0), (index_t) (i), (x))
120 jermar 111
#define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
112
#define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
2467 jermar 113
#define SET_FRAME_FLAGS_ARCH(ptl3, i, x) \
114
    set_pt_flags((pte_t *) (ptl3), (index_t) (i), (x))
120 jermar 115
 
2467 jermar 116
/* Macros for querying the last level entries. */
117
#define PTE_VALID_ARCH(p) \
118
    (*((uint32_t *) (p)) != 0)
119
#define PTE_PRESENT_ARCH(p) \
120
    ((p)->present != 0)
121
#define PTE_GET_FRAME_ARCH(p) \
122
    ((p)->frame_address << FRAME_WIDTH)
123
#define PTE_WRITABLE_ARCH(p) \
124
    ((p)->writeable != 0)
1423 jermar 125
#define PTE_EXECUTABLE_ARCH(p)          1
832 jermar 126
 
300 palkovsky 127
#ifndef __ASM__
128
 
2089 decky 129
#include <mm/mm.h>
130
#include <arch/interrupt.h>
3149 svoboda 131
#include <arch/types.h>
132
#include <typedefs.h>
300 palkovsky 133
 
1411 jermar 134
/* Page fault error codes. */
135
 
2467 jermar 136
/** When bit on this position is 0, the page fault was caused by a not-present
137
 * page.
138
 */
2089 decky 139
#define PFERR_CODE_P        (1 << 0)
1411 jermar 140
 
141
/** When bit on this position is 1, the page fault was caused by a write. */
2089 decky 142
#define PFERR_CODE_RW       (1 << 1)
1411 jermar 143
 
144
/** When bit on this position is 1, the page fault was caused in user mode. */
2089 decky 145
#define PFERR_CODE_US       (1 << 2)
1411 jermar 146
 
147
/** When bit on this position is 1, a reserved bit was set in page directory. */
2089 decky 148
#define PFERR_CODE_RSVD     (1 << 3)    
1411 jermar 149
 
120 jermar 150
static inline int get_pt_flags(pte_t *pt, index_t i)
151
{
152
    pte_t *p = &pt[i];
153
 
2467 jermar 154
    return ((!p->page_cache_disable) << PAGE_CACHEABLE_SHIFT |
155
        (!p->present) << PAGE_PRESENT_SHIFT |
156
        p->uaccessible << PAGE_USER_SHIFT |
157
        1 << PAGE_READ_SHIFT |
158
        p->writeable << PAGE_WRITE_SHIFT |
159
        1 << PAGE_EXEC_SHIFT |
160
        p->global << PAGE_GLOBAL_SHIFT);
120 jermar 161
}
162
 
163
static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
164
{
165
    pte_t *p = &pt[i];
166
 
167
    p->page_cache_disable = !(flags & PAGE_CACHEABLE);
168
    p->present = !(flags & PAGE_NOT_PRESENT);
135 jermar 169
    p->uaccessible = (flags & PAGE_USER) != 0;
170
    p->writeable = (flags & PAGE_WRITE) != 0;
825 jermar 171
    p->global = (flags & PAGE_GLOBAL) != 0;
831 jermar 172
 
173
    /*
2467 jermar 174
     * Ensure that there is at least one bit set even if the present bit is
175
     * cleared.
831 jermar 176
     */
177
    p->soft_valid = true;
120 jermar 178
}
179
 
1 jermar 180
extern void page_arch_init(void);
1411 jermar 181
extern void page_fault(int n, istate_t *istate);
1 jermar 182
 
300 palkovsky 183
#endif /* __ASM__ */
184
 
967 palkovsky 185
#endif /* KERNEL */
186
 
1 jermar 187
#endif
1702 cejka 188
 
1888 jermar 189
/** @}
1702 cejka 190
 */