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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
2 | * Copyright (C) 2006 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <genarch/mm/page_pt.h> |
29 | #include <genarch/mm/page_pt.h> |
30 | #include <mm/page.h> |
30 | #include <mm/page.h> |
31 | #include <mm/frame.h> |
31 | #include <mm/frame.h> |
32 | #include <mm/as.h> |
32 | #include <mm/as.h> |
33 | #include <arch/mm/page.h> |
33 | #include <arch/mm/page.h> |
34 | #include <arch/mm/as.h> |
34 | #include <arch/mm/as.h> |
35 | #include <arch/types.h> |
35 | #include <arch/types.h> |
36 | #include <typedefs.h> |
36 | #include <typedefs.h> |
37 | #include <memstr.h> |
37 | #include <memstr.h> |
38 | #include <arch.h> |
38 | #include <arch.h> |
39 | 39 | ||
40 | static pte_t *ptl0_create(int flags); |
40 | static pte_t *ptl0_create(int flags); |
41 | 41 | ||
42 | static void pt_lock(as_t *as, bool lock); |
42 | static void pt_lock(as_t *as, bool lock); |
43 | static void pt_unlock(as_t *as, bool unlock); |
43 | static void pt_unlock(as_t *as, bool unlock); |
44 | 44 | ||
45 | as_operations_t as_pt_operations = { |
45 | as_operations_t as_pt_operations = { |
46 | .page_table_create = ptl0_create, |
46 | .page_table_create = ptl0_create, |
47 | .page_table_lock = pt_lock, |
47 | .page_table_lock = pt_lock, |
48 | .page_table_unlock = pt_unlock |
48 | .page_table_unlock = pt_unlock |
49 | }; |
49 | }; |
50 | 50 | ||
51 | /** Create PTL0. |
51 | /** Create PTL0. |
52 | * |
52 | * |
53 | * PTL0 of 4-level page table will be created for each address space. |
53 | * PTL0 of 4-level page table will be created for each address space. |
54 | * |
54 | * |
55 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
55 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
56 | * |
56 | * |
57 | * @return New PTL0. |
57 | * @return New PTL0. |
58 | */ |
58 | */ |
59 | pte_t *ptl0_create(int flags) |
59 | pte_t *ptl0_create(int flags) |
60 | { |
60 | { |
61 | pte_t *src_ptl0, *dst_ptl0; |
61 | pte_t *src_ptl0, *dst_ptl0; |
62 | ipl_t ipl; |
62 | ipl_t ipl; |
63 | 63 | ||
64 | dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC))); |
64 | dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC))); |
65 | 65 | ||
66 | if (flags & FLAG_AS_KERNEL) { |
66 | if (flags & FLAG_AS_KERNEL) { |
67 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
67 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
68 | } else { |
68 | } else { |
- | 69 | __address src, dst; |
|
- | 70 | ||
69 | /* |
71 | /* |
70 | * Copy the kernel address space portion to new PTL0. |
72 | * Copy the kernel address space portion to new PTL0. |
71 | * TODO: copy only kernel address space. |
- | |
72 | */ |
73 | */ |
73 | 74 | ||
74 | ipl = interrupts_disable(); |
75 | ipl = interrupts_disable(); |
75 | spinlock_lock(&AS_KERNEL->lock); |
76 | spinlock_lock(&AS_KERNEL->lock); |
76 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
77 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
- | 78 | ||
- | 79 | src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
|
- | 80 | dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
|
- | 81 | ||
77 | memcpy((void *) dst_ptl0,(void *) src_ptl0, PAGE_SIZE); |
82 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
- | 83 | memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0)); |
|
78 | spinlock_unlock(&AS_KERNEL->lock); |
84 | spinlock_unlock(&AS_KERNEL->lock); |
79 | interrupts_restore(ipl); |
85 | interrupts_restore(ipl); |
80 | } |
86 | } |
81 | 87 | ||
82 | return (pte_t *) KA2PA((__address) dst_ptl0); |
88 | return (pte_t *) KA2PA((__address) dst_ptl0); |
83 | } |
89 | } |
84 | 90 | ||
85 | /** Lock page tables. |
91 | /** Lock page tables. |
86 | * |
92 | * |
87 | * Lock only the address space. |
93 | * Lock only the address space. |
88 | * Interrupts must be disabled. |
94 | * Interrupts must be disabled. |
89 | * |
95 | * |
90 | * @param as Address space. |
96 | * @param as Address space. |
91 | * @param lock If false, do not attempt to lock the address space. |
97 | * @param lock If false, do not attempt to lock the address space. |
92 | */ |
98 | */ |
93 | void pt_lock(as_t *as, bool lock) |
99 | void pt_lock(as_t *as, bool lock) |
94 | { |
100 | { |
95 | if (lock) |
101 | if (lock) |
96 | spinlock_lock(&as->lock); |
102 | spinlock_lock(&as->lock); |
97 | } |
103 | } |
98 | 104 | ||
99 | /** Unlock page tables. |
105 | /** Unlock page tables. |
100 | * |
106 | * |
101 | * Unlock the address space. |
107 | * Unlock the address space. |
102 | * Interrupts must be disabled. |
108 | * Interrupts must be disabled. |
103 | * |
109 | * |
104 | * @param as Address space. |
110 | * @param as Address space. |
105 | * @param unlock If false, do not attempt to unlock the address space. |
111 | * @param unlock If false, do not attempt to unlock the address space. |
106 | */ |
112 | */ |
107 | void pt_unlock(as_t *as, bool unlock) |
113 | void pt_unlock(as_t *as, bool unlock) |
108 | { |
114 | { |
109 | if (unlock) |
115 | if (unlock) |
110 | spinlock_unlock(&as->lock); |
116 | spinlock_unlock(&as->lock); |
111 | } |
117 | } |
112 | 118 |