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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 | /** |
|
- | 30 | * @file as_pt.c |
|
- | 31 | * @brief Address space functions for 4-level hierarchical pagetables. |
|
- | 32 | */ |
|
- | 33 | ||
29 | #include <genarch/mm/page_pt.h> |
34 | #include <genarch/mm/page_pt.h> |
30 | #include <mm/page.h> |
35 | #include <mm/page.h> |
31 | #include <mm/frame.h> |
36 | #include <mm/frame.h> |
32 | #include <mm/as.h> |
37 | #include <mm/as.h> |
33 | #include <arch/mm/page.h> |
38 | #include <arch/mm/page.h> |
34 | #include <arch/mm/as.h> |
39 | #include <arch/mm/as.h> |
35 | #include <arch/types.h> |
40 | #include <arch/types.h> |
36 | #include <typedefs.h> |
41 | #include <typedefs.h> |
37 | #include <memstr.h> |
42 | #include <memstr.h> |
38 | #include <arch.h> |
43 | #include <arch.h> |
39 | 44 | ||
40 | static pte_t *ptl0_create(int flags); |
45 | static pte_t *ptl0_create(int flags); |
41 | 46 | ||
42 | static void pt_lock(as_t *as, bool lock); |
47 | static void pt_lock(as_t *as, bool lock); |
43 | static void pt_unlock(as_t *as, bool unlock); |
48 | static void pt_unlock(as_t *as, bool unlock); |
44 | 49 | ||
45 | as_operations_t as_pt_operations = { |
50 | as_operations_t as_pt_operations = { |
46 | .page_table_create = ptl0_create, |
51 | .page_table_create = ptl0_create, |
47 | .page_table_lock = pt_lock, |
52 | .page_table_lock = pt_lock, |
48 | .page_table_unlock = pt_unlock |
53 | .page_table_unlock = pt_unlock |
49 | }; |
54 | }; |
50 | 55 | ||
51 | /** Create PTL0. |
56 | /** Create PTL0. |
52 | * |
57 | * |
53 | * PTL0 of 4-level page table will be created for each address space. |
58 | * PTL0 of 4-level page table will be created for each address space. |
54 | * |
59 | * |
55 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
60 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
56 | * |
61 | * |
57 | * @return New PTL0. |
62 | * @return New PTL0. |
58 | */ |
63 | */ |
59 | pte_t *ptl0_create(int flags) |
64 | pte_t *ptl0_create(int flags) |
60 | { |
65 | { |
61 | pte_t *src_ptl0, *dst_ptl0; |
66 | pte_t *src_ptl0, *dst_ptl0; |
62 | ipl_t ipl; |
67 | ipl_t ipl; |
63 | 68 | ||
64 | dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC))); |
69 | dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC))); |
65 | 70 | ||
66 | if (flags & FLAG_AS_KERNEL) { |
71 | if (flags & FLAG_AS_KERNEL) { |
67 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
72 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
68 | } else { |
73 | } else { |
69 | __address src, dst; |
74 | __address src, dst; |
70 | 75 | ||
71 | /* |
76 | /* |
72 | * Copy the kernel address space portion to new PTL0. |
77 | * Copy the kernel address space portion to new PTL0. |
73 | */ |
78 | */ |
74 | 79 | ||
75 | ipl = interrupts_disable(); |
80 | ipl = interrupts_disable(); |
76 | spinlock_lock(&AS_KERNEL->lock); |
81 | spinlock_lock(&AS_KERNEL->lock); |
77 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
82 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
78 | 83 | ||
79 | src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
84 | src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
80 | dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
85 | dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
81 | 86 | ||
82 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
87 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
83 | memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0)); |
88 | memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0)); |
84 | spinlock_unlock(&AS_KERNEL->lock); |
89 | spinlock_unlock(&AS_KERNEL->lock); |
85 | interrupts_restore(ipl); |
90 | interrupts_restore(ipl); |
86 | } |
91 | } |
87 | 92 | ||
88 | return (pte_t *) KA2PA((__address) dst_ptl0); |
93 | return (pte_t *) KA2PA((__address) dst_ptl0); |
89 | } |
94 | } |
90 | 95 | ||
91 | /** Lock page tables. |
96 | /** Lock page tables. |
92 | * |
97 | * |
93 | * Lock only the address space. |
98 | * Lock only the address space. |
94 | * Interrupts must be disabled. |
99 | * Interrupts must be disabled. |
95 | * |
100 | * |
96 | * @param as Address space. |
101 | * @param as Address space. |
97 | * @param lock If false, do not attempt to lock the address space. |
102 | * @param lock If false, do not attempt to lock the address space. |
98 | */ |
103 | */ |
99 | void pt_lock(as_t *as, bool lock) |
104 | void pt_lock(as_t *as, bool lock) |
100 | { |
105 | { |
101 | if (lock) |
106 | if (lock) |
102 | spinlock_lock(&as->lock); |
107 | spinlock_lock(&as->lock); |
103 | } |
108 | } |
104 | 109 | ||
105 | /** Unlock page tables. |
110 | /** Unlock page tables. |
106 | * |
111 | * |
107 | * Unlock the address space. |
112 | * Unlock the address space. |
108 | * Interrupts must be disabled. |
113 | * Interrupts must be disabled. |
109 | * |
114 | * |
110 | * @param as Address space. |
115 | * @param as Address space. |
111 | * @param unlock If false, do not attempt to unlock the address space. |
116 | * @param unlock If false, do not attempt to unlock the address space. |
112 | */ |
117 | */ |
113 | void pt_unlock(as_t *as, bool unlock) |
118 | void pt_unlock(as_t *as, bool unlock) |
114 | { |
119 | { |
115 | if (unlock) |
120 | if (unlock) |
116 | spinlock_unlock(&as->lock); |
121 | spinlock_unlock(&as->lock); |
117 | } |
122 | } |
118 | 123 |