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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 | /** @addtogroup genarchmm |
29 | /** @addtogroup genarchmm |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief Address space functions for 4-level hierarchical pagetables. |
35 | * @brief Address space functions for 4-level hierarchical pagetables. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <genarch/mm/page_pt.h> |
38 | #include <genarch/mm/page_pt.h> |
39 | #include <mm/page.h> |
39 | #include <mm/page.h> |
40 | #include <mm/frame.h> |
40 | #include <mm/frame.h> |
41 | #include <mm/as.h> |
41 | #include <mm/as.h> |
42 | #include <synch/mutex.h> |
42 | #include <synch/mutex.h> |
43 | #include <arch/mm/page.h> |
43 | #include <arch/mm/page.h> |
44 | #include <arch/mm/as.h> |
44 | #include <arch/mm/as.h> |
45 | #include <arch/types.h> |
45 | #include <arch/types.h> |
46 | #include <typedefs.h> |
46 | #include <typedefs.h> |
47 | #include <memstr.h> |
47 | #include <memstr.h> |
48 | #include <arch.h> |
48 | #include <arch.h> |
49 | 49 | ||
50 | static pte_t *ptl0_create(int flags); |
50 | static pte_t *ptl0_create(int flags); |
51 | static void ptl0_destroy(pte_t *page_table); |
51 | static void ptl0_destroy(pte_t *page_table); |
52 | 52 | ||
53 | static void pt_lock(as_t *as, bool lock); |
53 | static void pt_lock(as_t *as, bool lock); |
54 | static void pt_unlock(as_t *as, bool unlock); |
54 | static void pt_unlock(as_t *as, bool unlock); |
55 | 55 | ||
56 | as_operations_t as_pt_operations = { |
56 | as_operations_t as_pt_operations = { |
57 | .page_table_create = ptl0_create, |
57 | .page_table_create = ptl0_create, |
58 | .page_table_destroy = ptl0_destroy, |
58 | .page_table_destroy = ptl0_destroy, |
59 | .page_table_lock = pt_lock, |
59 | .page_table_lock = pt_lock, |
60 | .page_table_unlock = pt_unlock |
60 | .page_table_unlock = pt_unlock |
61 | }; |
61 | }; |
62 | 62 | ||
63 | /** Create PTL0. |
63 | /** Create PTL0. |
64 | * |
64 | * |
65 | * PTL0 of 4-level page table will be created for each address space. |
65 | * PTL0 of 4-level page table will be created for each address space. |
66 | * |
66 | * |
67 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
67 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
68 | * |
68 | * |
69 | * @return New PTL0. |
69 | * @return New PTL0. |
70 | */ |
70 | */ |
71 | pte_t *ptl0_create(int flags) |
71 | pte_t *ptl0_create(int flags) |
72 | { |
72 | { |
73 | pte_t *src_ptl0, *dst_ptl0; |
73 | pte_t *src_ptl0, *dst_ptl0; |
74 | ipl_t ipl; |
74 | ipl_t ipl; |
75 | 75 | ||
76 | dst_ptl0 = (pte_t *) frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC); |
76 | dst_ptl0 = (pte_t *) frame_alloc(ONE_FRAME, FRAME_KA); |
77 | 77 | ||
78 | if (flags & FLAG_AS_KERNEL) { |
78 | if (flags & FLAG_AS_KERNEL) { |
79 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
79 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
80 | } else { |
80 | } else { |
81 | __address src, dst; |
81 | __address src, dst; |
82 | 82 | ||
83 | /* |
83 | /* |
84 | * Copy the kernel address space portion to new PTL0. |
84 | * Copy the kernel address space portion to new PTL0. |
85 | */ |
85 | */ |
86 | 86 | ||
87 | ipl = interrupts_disable(); |
87 | ipl = interrupts_disable(); |
88 | mutex_lock(&AS_KERNEL->lock); |
88 | mutex_lock(&AS_KERNEL->lock); |
89 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
89 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
90 | 90 | ||
91 | src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
91 | src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
92 | dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
92 | dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
93 | 93 | ||
94 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
94 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
95 | memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0)); |
95 | memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0)); |
96 | mutex_unlock(&AS_KERNEL->lock); |
96 | mutex_unlock(&AS_KERNEL->lock); |
97 | interrupts_restore(ipl); |
97 | interrupts_restore(ipl); |
98 | } |
98 | } |
99 | 99 | ||
100 | return (pte_t *) KA2PA((__address) dst_ptl0); |
100 | return (pte_t *) KA2PA((__address) dst_ptl0); |
101 | } |
101 | } |
102 | 102 | ||
103 | /** Destroy page table. |
103 | /** Destroy page table. |
104 | * |
104 | * |
105 | * Destroy PTL0, other levels are expected to be already deallocated. |
105 | * Destroy PTL0, other levels are expected to be already deallocated. |
106 | * |
106 | * |
107 | * @param page_table Physical address of PTL0. |
107 | * @param page_table Physical address of PTL0. |
108 | */ |
108 | */ |
109 | void ptl0_destroy(pte_t *page_table) |
109 | void ptl0_destroy(pte_t *page_table) |
110 | { |
110 | { |
111 | frame_free((__address)page_table); |
111 | frame_free((__address)page_table); |
112 | } |
112 | } |
113 | 113 | ||
114 | /** Lock page tables. |
114 | /** Lock page tables. |
115 | * |
115 | * |
116 | * Lock only the address space. |
116 | * Lock only the address space. |
117 | * Interrupts must be disabled. |
117 | * Interrupts must be disabled. |
118 | * |
118 | * |
119 | * @param as Address space. |
119 | * @param as Address space. |
120 | * @param lock If false, do not attempt to lock the address space. |
120 | * @param lock If false, do not attempt to lock the address space. |
121 | */ |
121 | */ |
122 | void pt_lock(as_t *as, bool lock) |
122 | void pt_lock(as_t *as, bool lock) |
123 | { |
123 | { |
124 | if (lock) |
124 | if (lock) |
125 | mutex_lock(&as->lock); |
125 | mutex_lock(&as->lock); |
126 | } |
126 | } |
127 | 127 | ||
128 | /** Unlock page tables. |
128 | /** Unlock page tables. |
129 | * |
129 | * |
130 | * Unlock the address space. |
130 | * Unlock the address space. |
131 | * Interrupts must be disabled. |
131 | * Interrupts must be disabled. |
132 | * |
132 | * |
133 | * @param as Address space. |
133 | * @param as Address space. |
134 | * @param unlock If false, do not attempt to unlock the address space. |
134 | * @param unlock If false, do not attempt to unlock the address space. |
135 | */ |
135 | */ |
136 | void pt_unlock(as_t *as, bool unlock) |
136 | void pt_unlock(as_t *as, bool unlock) |
137 | { |
137 | { |
138 | if (unlock) |
138 | if (unlock) |
139 | mutex_unlock(&as->lock); |
139 | mutex_unlock(&as->lock); |
140 | } |
140 | } |
141 | 141 | ||
142 | /** @} |
142 | /** @} |
143 | */ |
143 | */ |
144 | 144 | ||
145 | 145 |