Subversion Repositories HelenOS

Rev

Rev 4490 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
164 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2005 Ondrej Palkovsky
164 palkovsky 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
 
1780 jermar 29
/** @addtogroup amd64mm
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1063 palkovsky 35
/** Paging on AMD64
36
 *
37
 * The space is divided in positive numbers - userspace and
38
 * negative numbers - kernel space. The 'negative' space starting
39
 * with 0xffff800000000000 and ending with 0xffffffff80000000
40
 * (-2GB) is identically mapped physical memory. The area
41
 * (0xffffffff80000000 ... 0xffffffffffffffff is again identically
42
 * mapped first 2GB.
43
 *
44
 * ATTENTION - PA2KA(KA2PA(x)) != x if 'x' is in kernel
45
 */
46
 
1888 jermar 47
#ifndef KERN_amd64_PAGE_H_
48
#define KERN_amd64_PAGE_H_
164 palkovsky 49
 
808 palkovsky 50
#include <arch/mm/frame.h>
51
 
967 palkovsky 52
#define PAGE_WIDTH  FRAME_WIDTH
53
#define PAGE_SIZE   FRAME_SIZE
54
 
55
#ifdef KERNEL
56
 
194 palkovsky 57
#ifndef __ASM__
2089 decky 58
#   include <mm/mm.h>
59
#   include <arch/types.h>
60
#   include <arch/interrupt.h>
164 palkovsky 61
 
1780 jermar 62
static inline uintptr_t ka2pa(uintptr_t x)
1063 palkovsky 63
{
64
    if (x > 0xffffffff80000000)
65
        return x - 0xffffffff80000000;
66
    else
67
        return x - 0xffff800000000000;
68
}
2089 decky 69
 
2467 jermar 70
#   define KA2PA(x)     ka2pa((uintptr_t) x)
71
#   define PA2KA_CODE(x)    (((uintptr_t) (x)) + 0xffffffff80000000)
72
#   define PA2KA(x)     (((uintptr_t) (x)) + 0xffff800000000000)
194 palkovsky 73
#else
2467 jermar 74
#   define KA2PA(x)     ((x) - 0xffffffff80000000)
75
#   define PA2KA(x)     ((x) + 0xffffffff80000000)
194 palkovsky 76
#endif
77
 
2467 jermar 78
/* Number of entries in each level. */
832 jermar 79
#define PTL0_ENTRIES_ARCH   512
80
#define PTL1_ENTRIES_ARCH   512
81
#define PTL2_ENTRIES_ARCH   512
82
#define PTL3_ENTRIES_ARCH   512
83
 
2467 jermar 84
/* Page table sizes for each level. */
85
#define PTL0_SIZE_ARCH      ONE_FRAME
86
#define PTL1_SIZE_ARCH      ONE_FRAME
87
#define PTL2_SIZE_ARCH      ONE_FRAME
88
#define PTL3_SIZE_ARCH      ONE_FRAME
2465 jermar 89
 
2467 jermar 90
/* Macros calculating indices into page tables in each level. */
91
#define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 39) & 0x1ff)
92
#define PTL1_INDEX_ARCH(vaddr)  (((vaddr) >> 30) & 0x1ff)
93
#define PTL2_INDEX_ARCH(vaddr)  (((vaddr) >> 21) & 0x1ff)
94
#define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x1ff)
164 palkovsky 95
 
2467 jermar 96
/* Get PTE address accessors for each level. */
97
#define GET_PTL1_ADDRESS_ARCH(ptl0, i) \
98
    ((pte_t *) ((((uint64_t) ((pte_t *) (ptl0))[(i)].addr_12_31) << 12) | \
99
        (((uint64_t) ((pte_t *) (ptl0))[(i)].addr_32_51) << 32)))
100
#define GET_PTL2_ADDRESS_ARCH(ptl1, i) \
101
    ((pte_t *) ((((uint64_t) ((pte_t *) (ptl1))[(i)].addr_12_31) << 12) | \
102
        (((uint64_t) ((pte_t *) (ptl1))[(i)].addr_32_51) << 32)))
103
#define GET_PTL3_ADDRESS_ARCH(ptl2, i) \
104
    ((pte_t *) ((((uint64_t) ((pte_t *) (ptl2))[(i)].addr_12_31) << 12) | \
105
        (((uint64_t) ((pte_t *) (ptl2))[(i)].addr_32_51) << 32)))
106
#define GET_FRAME_ADDRESS_ARCH(ptl3, i) \
107
    ((uintptr_t *) \
108
        ((((uint64_t) ((pte_t *) (ptl3))[(i)].addr_12_31) << 12) | \
109
        (((uint64_t) ((pte_t *) (ptl3))[(i)].addr_32_51) << 32)))
164 palkovsky 110
 
2467 jermar 111
/* Set PTE address accessors for each level. */
112
#define SET_PTL0_ADDRESS_ARCH(ptl0) \
113
    (write_cr3((uintptr_t) (ptl0)))
114
#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \
4490 decky 115
    set_pt_addr((pte_t *) (ptl0), (size_t) (i), a)
2467 jermar 116
#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) \
4490 decky 117
    set_pt_addr((pte_t *) (ptl1), (size_t) (i), a)
2467 jermar 118
#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) \
4490 decky 119
    set_pt_addr((pte_t *) (ptl2), (size_t) (i), a)
2467 jermar 120
#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \
4490 decky 121
    set_pt_addr((pte_t *) (ptl3), (size_t) (i), a)
164 palkovsky 122
 
2467 jermar 123
/* Get PTE flags accessors for each level. */
124
#define GET_PTL1_FLAGS_ARCH(ptl0, i) \
4490 decky 125
    get_pt_flags((pte_t *) (ptl0), (size_t) (i))
2467 jermar 126
#define GET_PTL2_FLAGS_ARCH(ptl1, i) \
4490 decky 127
    get_pt_flags((pte_t *) (ptl1), (size_t) (i))
2467 jermar 128
#define GET_PTL3_FLAGS_ARCH(ptl2, i) \
4490 decky 129
    get_pt_flags((pte_t *) (ptl2), (size_t) (i))
2467 jermar 130
#define GET_FRAME_FLAGS_ARCH(ptl3, i) \
4490 decky 131
    get_pt_flags((pte_t *) (ptl3), (size_t) (i))
164 palkovsky 132
 
2467 jermar 133
/* Set PTE flags accessors for each level. */
134
#define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \
4490 decky 135
    set_pt_flags((pte_t *) (ptl0), (size_t) (i), (x))
2467 jermar 136
#define SET_PTL2_FLAGS_ARCH(ptl1, i, x) \
4490 decky 137
    set_pt_flags((pte_t *) (ptl1), (size_t) (i), (x))
2467 jermar 138
#define SET_PTL3_FLAGS_ARCH(ptl2, i, x) \
4490 decky 139
    set_pt_flags((pte_t *) (ptl2), (size_t) (i), (x))
2467 jermar 140
#define SET_FRAME_FLAGS_ARCH(ptl3, i, x) \
4490 decky 141
    set_pt_flags((pte_t *) (ptl3), (size_t) (i), (x))
164 palkovsky 142
 
2467 jermar 143
/* Macros for querying the last-level PTE entries. */
144
#define PTE_VALID_ARCH(p) \
145
    (*((uint64_t *) (p)) != 0)
146
#define PTE_PRESENT_ARCH(p) \
147
    ((p)->present != 0)
148
#define PTE_GET_FRAME_ARCH(p) \
149
    ((((uintptr_t) (p)->addr_12_31) << 12) | \
150
        ((uintptr_t) (p)->addr_32_51 << 32))
151
#define PTE_WRITABLE_ARCH(p) \
152
    ((p)->writeable != 0)
153
#define PTE_EXECUTABLE_ARCH(p) \
154
    ((p)->no_execute == 0)
832 jermar 155
 
226 palkovsky 156
#ifndef __ASM__
164 palkovsky 157
 
1411 jermar 158
/* Page fault error codes. */
159
 
2467 jermar 160
/** When bit on this position is 0, the page fault was caused by a not-present
161
 * page.
162
 */
163
#define PFERR_CODE_P            (1 << 0)  
1411 jermar 164
 
165
/** When bit on this position is 1, the page fault was caused by a write. */
2467 jermar 166
#define PFERR_CODE_RW           (1 << 1)
1411 jermar 167
 
168
/** When bit on this position is 1, the page fault was caused in user mode. */
2467 jermar 169
#define PFERR_CODE_US           (1 << 2)
1411 jermar 170
 
171
/** When bit on this position is 1, a reserved bit was set in page directory. */
2467 jermar 172
#define PFERR_CODE_RSVD         (1 << 3)
1411 jermar 173
 
2467 jermar 174
/** When bit on this position os 1, the page fault was caused during instruction
175
 * fecth.
176
 */
177
#define PFERR_CODE_ID       (1 << 4)
1411 jermar 178
 
4490 decky 179
static inline int get_pt_flags(pte_t *pt, size_t i)
226 palkovsky 180
{
181
    pte_t *p = &pt[i];
182
 
2467 jermar 183
    return ((!p->page_cache_disable) << PAGE_CACHEABLE_SHIFT |
184
        (!p->present) << PAGE_PRESENT_SHIFT |
185
        p->uaccessible << PAGE_USER_SHIFT |
186
        1 << PAGE_READ_SHIFT |
187
        p->writeable << PAGE_WRITE_SHIFT |
188
        (!p->no_execute) << PAGE_EXEC_SHIFT |
189
        p->global << PAGE_GLOBAL_SHIFT);
226 palkovsky 190
}
191
 
4490 decky 192
static inline void set_pt_addr(pte_t *pt, size_t i, uintptr_t a)
226 palkovsky 193
{
194
    pte_t *p = &pt[i];
195
 
196
    p->addr_12_31 = (a >> 12) & 0xfffff;
197
    p->addr_32_51 = a >> 32;
198
}
199
 
4490 decky 200
static inline void set_pt_flags(pte_t *pt, size_t i, int flags)
226 palkovsky 201
{
202
    pte_t *p = &pt[i];
203
 
204
    p->page_cache_disable = !(flags & PAGE_CACHEABLE);
205
    p->present = !(flags & PAGE_NOT_PRESENT);
206
    p->uaccessible = (flags & PAGE_USER) != 0;
207
    p->writeable = (flags & PAGE_WRITE) != 0;
208
    p->no_execute = (flags & PAGE_EXEC) == 0;
825 jermar 209
    p->global = (flags & PAGE_GLOBAL) != 0;
831 jermar 210
 
211
    /*
212
     * Ensure that there is at least one bit set even if the present bit is cleared.
213
     */
214
    p->soft_valid = 1;
226 palkovsky 215
}
216
 
164 palkovsky 217
extern void page_arch_init(void);
1958 decky 218
extern void page_fault(int n, istate_t *istate);
164 palkovsky 219
 
967 palkovsky 220
#endif /* __ASM__ */
164 palkovsky 221
 
967 palkovsky 222
#endif /* KERNEL */
223
 
164 palkovsky 224
#endif
1702 cejka 225
 
1780 jermar 226
/** @}
1702 cejka 227
 */