Subversion Repositories HelenOS

Rev

Rev 2071 | Rev 2465 | 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
 */
832 jermar 59
#define PTL0_ENTRIES_ARCH   1024
60
#define PTL1_ENTRIES_ARCH   0
61
#define PTL2_ENTRIES_ARCH   0
62
#define PTL3_ENTRIES_ARCH   1024
63
 
2089 decky 64
#define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)
119 jermar 65
#define PTL1_INDEX_ARCH(vaddr)  0
66
#define PTL2_INDEX_ARCH(vaddr)  0
2089 decky 67
#define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)
119 jermar 68
 
2089 decky 69
#define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)((((pte_t *)(ptl0))[(i)].frame_address) << 12))
119 jermar 70
#define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
71
#define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
2089 decky 72
#define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((uintptr_t)((((pte_t *)(ptl3))[(i)].frame_address) << 12))
119 jermar 73
 
1780 jermar 74
#define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((uintptr_t) (ptl0)))
120 jermar 75
#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].frame_address = (a)>>12)
76
#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
77
#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
78
#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *)(ptl3))[(i)].frame_address = (a)>>12)
119 jermar 79
 
120 jermar 80
#define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
81
#define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
82
#define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
83
#define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
84
 
85
#define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
86
#define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
87
#define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
88
#define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
89
 
1780 jermar 90
#define PTE_VALID_ARCH(p)           (*((uint32_t *) (p)) != 0)
977 jermar 91
#define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
2089 decky 92
#define PTE_GET_FRAME_ARCH(p)           ((p)->frame_address << FRAME_WIDTH)
1423 jermar 93
#define PTE_WRITABLE_ARCH(p)            ((p)->writeable != 0)
94
#define PTE_EXECUTABLE_ARCH(p)          1
832 jermar 95
 
300 palkovsky 96
#ifndef __ASM__
97
 
2089 decky 98
#include <mm/mm.h>
99
#include <arch/interrupt.h>
300 palkovsky 100
 
1411 jermar 101
/* Page fault error codes. */
102
 
103
/** When bit on this position is 0, the page fault was caused by a not-present page. */
2089 decky 104
#define PFERR_CODE_P        (1 << 0)
1411 jermar 105
 
106
/** When bit on this position is 1, the page fault was caused by a write. */
2089 decky 107
#define PFERR_CODE_RW       (1 << 1)
1411 jermar 108
 
109
/** When bit on this position is 1, the page fault was caused in user mode. */
2089 decky 110
#define PFERR_CODE_US       (1 << 2)
1411 jermar 111
 
112
/** When bit on this position is 1, a reserved bit was set in page directory. */
2089 decky 113
#define PFERR_CODE_RSVD     (1 << 3)    
1411 jermar 114
 
120 jermar 115
static inline int get_pt_flags(pte_t *pt, index_t i)
116
{
117
    pte_t *p = &pt[i];
118
 
119
    return (
2089 decky 120
        (!p->page_cache_disable) << PAGE_CACHEABLE_SHIFT |
121
        (!p->present) << PAGE_PRESENT_SHIFT |
122
        p->uaccessible << PAGE_USER_SHIFT |
120 jermar 123
        1<<PAGE_READ_SHIFT |
2089 decky 124
        p->writeable << PAGE_WRITE_SHIFT |
825 jermar 125
        1<<PAGE_EXEC_SHIFT |
2089 decky 126
        p->global << PAGE_GLOBAL_SHIFT
120 jermar 127
    );
128
}
129
 
130
static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
131
{
132
    pte_t *p = &pt[i];
133
 
134
    p->page_cache_disable = !(flags & PAGE_CACHEABLE);
135
    p->present = !(flags & PAGE_NOT_PRESENT);
135 jermar 136
    p->uaccessible = (flags & PAGE_USER) != 0;
137
    p->writeable = (flags & PAGE_WRITE) != 0;
825 jermar 138
    p->global = (flags & PAGE_GLOBAL) != 0;
831 jermar 139
 
140
    /*
141
     * Ensure that there is at least one bit set even if the present bit is cleared.
142
     */
143
    p->soft_valid = true;
120 jermar 144
}
145
 
1 jermar 146
extern void page_arch_init(void);
1411 jermar 147
extern void page_fault(int n, istate_t *istate);
1 jermar 148
 
300 palkovsky 149
#endif /* __ASM__ */
150
 
967 palkovsky 151
#endif /* KERNEL */
152
 
1 jermar 153
#endif
1702 cejka 154
 
1888 jermar 155
/** @}
1702 cejka 156
 */