Subversion Repositories HelenOS-historic

Rev

Rev 977 | Rev 1087 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
319 jermar 2
 * Copyright (C) 2003-2004 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
 
341 jermar 29
#ifndef __mips32_PAGE_H__
30
#define __mips32_PAGE_H__
1 jermar 31
 
967 palkovsky 32
#include <arch/mm/frame.h>
33
 
765 jermar 34
#define PAGE_WIDTH  FRAME_WIDTH
1 jermar 35
#define PAGE_SIZE   FRAME_SIZE
36
 
306 palkovsky 37
#ifndef __ASM__
38
#  define KA2PA(x)  (((__address) (x)) - 0x80000000)
39
#  define PA2KA(x)  (((__address) (x)) + 0x80000000)
40
#else
41
#  define KA2PA(x)  ((x) - 0x80000000)
42
#  define PA2KA(x)  ((x) + 0x80000000)
43
#endif
1 jermar 44
 
967 palkovsky 45
#ifdef KERNEL
46
 
120 jermar 47
/*
48
 * Implementation of generic 4-level page table interface.
121 jermar 49
 * NOTE: this implementation is under construction
50
 *
51
 * Page table layout:
52
 * - 32-bit virtual addresses
53
 * - Offset is 14 bits => pages are 16K long
394 jermar 54
 * - PTE's use similar format as CP0 EntryLo[01] registers => PTE is therefore 4 bytes long
831 jermar 55
 * - PTE's replace EntryLo v (valid) bit with p (present) bit
56
 * - PTE's use only one bit to distinguish between cacheable and uncacheable mappings
57
 * - PTE's define soft_valid field to ensure there is at least one 1 bit even if the p bit is cleared
394 jermar 58
 * - PTE's make use of CP0 EntryLo's two-bit reserved field for bit W (writable) and bit A (accessed)
121 jermar 59
 * - PTL0 has 64 entries (6 bits)
60
 * - PTL1 is not used
61
 * - PTL2 is not used
62
 * - PTL3 has 4096 entries (12 bits)
120 jermar 63
 */
121 jermar 64
 
832 jermar 65
#define PTL0_ENTRIES_ARCH   64
66
#define PTL1_ENTRIES_ARCH   0
67
#define PTL2_ENTRIES_ARCH   0
68
#define PTL3_ENTRIES_ARCH   4096
69
 
121 jermar 70
#define PTL0_INDEX_ARCH(vaddr)  ((vaddr)>>26) 
120 jermar 71
#define PTL1_INDEX_ARCH(vaddr)  0
72
#define PTL2_INDEX_ARCH(vaddr)  0
394 jermar 73
#define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>14)&0x3fff)
120 jermar 74
 
760 jermar 75
#define SET_PTL0_ADDRESS_ARCH(ptl0)
120 jermar 76
 
831 jermar 77
#define GET_PTL1_ADDRESS_ARCH(ptl0, i)      (((pte_t *)(ptl0))[(i)].pfn<<12)
125 jermar 78
#define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
79
#define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
831 jermar 80
#define GET_FRAME_ADDRESS_ARCH(ptl3, i)     (((pte_t *)(ptl3))[(i)].pfn<<12)
121 jermar 81
 
831 jermar 82
#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].pfn = (a)>>12)
120 jermar 83
#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
84
#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
831 jermar 85
#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *)(ptl3))[(i)].pfn = (a)>>12)
120 jermar 86
 
125 jermar 87
#define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
88
#define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
89
#define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
90
#define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
120 jermar 91
 
121 jermar 92
#define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
120 jermar 93
#define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
94
#define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
121 jermar 95
#define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
120 jermar 96
 
977 jermar 97
#define PTE_VALID_ARCH(pte)         (*((__u32 *) (pte)) != 0)
98
#define PTE_PRESENT_ARCH(pte)           ((pte)->p != 0)
980 palkovsky 99
#define PTE_GET_FRAME_ARCH(pte)         ((pte)->pfn<<12)
832 jermar 100
 
306 palkovsky 101
#ifndef __ASM__
102
 
103
#include <arch/mm/tlb.h>
104
#include <mm/page.h>
105
#include <arch/mm/frame.h>
106
#include <arch/types.h>
107
 
121 jermar 108
static inline int get_pt_flags(pte_t *pt, index_t i)
109
{
110
    pte_t *p = &pt[i];
111
 
112
    return (
831 jermar 113
        (p->cacheable<<PAGE_CACHEABLE_SHIFT) |
114
        ((!p->p)<<PAGE_PRESENT_SHIFT) |
121 jermar 115
        (1<<PAGE_USER_SHIFT) |
116
        (1<<PAGE_READ_SHIFT) |
394 jermar 117
        ((p->w)<<PAGE_WRITE_SHIFT) |
825 jermar 118
        (1<<PAGE_EXEC_SHIFT) |
831 jermar 119
        (p->g<<PAGE_GLOBAL_SHIFT)
121 jermar 120
    );
121
 
122
}
120 jermar 123
 
121 jermar 124
static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
125
{
126
    pte_t *p = &pt[i];
127
 
831 jermar 128
    p->cacheable = (flags & PAGE_CACHEABLE) != 0;
129
    p->p = !(flags & PAGE_NOT_PRESENT);
130
    p->g = (flags & PAGE_GLOBAL) != 0;
394 jermar 131
    p->w = (flags & PAGE_WRITE) != 0;
831 jermar 132
 
133
    /*
134
     * Ensure that valid entries have at least one bit set.
135
     */
136
    p->soft_valid = 1;
121 jermar 137
}
138
 
139
extern void page_arch_init(void);
140
 
306 palkovsky 141
#endif /* __ASM__ */
142
 
967 palkovsky 143
#endif /* KERNEL */
144
 
1 jermar 145
#endif