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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 | /** |
29 | /** |
30 | * @file as_pt.c |
30 | * @file as_pt.c |
31 | * @brief Address space functions for 4-level hierarchical pagetables. |
31 | * @brief Address space functions for 4-level hierarchical pagetables. |
32 | */ |
32 | */ |
33 | 33 | ||
34 | #include <genarch/mm/page_pt.h> |
34 | #include <genarch/mm/page_pt.h> |
35 | #include <mm/page.h> |
35 | #include <mm/page.h> |
36 | #include <mm/frame.h> |
36 | #include <mm/frame.h> |
37 | #include <mm/as.h> |
37 | #include <mm/as.h> |
38 | #include <synch/mutex.h> |
38 | #include <synch/mutex.h> |
39 | #include <arch/mm/page.h> |
39 | #include <arch/mm/page.h> |
40 | #include <arch/mm/as.h> |
40 | #include <arch/mm/as.h> |
41 | #include <arch/types.h> |
41 | #include <arch/types.h> |
42 | #include <typedefs.h> |
42 | #include <typedefs.h> |
43 | #include <memstr.h> |
43 | #include <memstr.h> |
44 | #include <arch.h> |
44 | #include <arch.h> |
45 | 45 | ||
46 | static pte_t *ptl0_create(int flags); |
46 | static pte_t *ptl0_create(int flags); |
47 | static void ptl0_destroy(pte_t *page_table); |
47 | static void ptl0_destroy(pte_t *page_table); |
48 | 48 | ||
49 | static void pt_lock(as_t *as, bool lock); |
49 | static void pt_lock(as_t *as, bool lock); |
50 | static void pt_unlock(as_t *as, bool unlock); |
50 | static void pt_unlock(as_t *as, bool unlock); |
51 | 51 | ||
52 | as_operations_t as_pt_operations = { |
52 | as_operations_t as_pt_operations = { |
53 | .page_table_create = ptl0_create, |
53 | .page_table_create = ptl0_create, |
54 | .page_table_destroy = ptl0_destroy, |
54 | .page_table_destroy = ptl0_destroy, |
55 | .page_table_lock = pt_lock, |
55 | .page_table_lock = pt_lock, |
56 | .page_table_unlock = pt_unlock |
56 | .page_table_unlock = pt_unlock |
57 | }; |
57 | }; |
58 | 58 | ||
59 | /** Create PTL0. |
59 | /** Create PTL0. |
60 | * |
60 | * |
61 | * PTL0 of 4-level page table will be created for each address space. |
61 | * PTL0 of 4-level page table will be created for each address space. |
62 | * |
62 | * |
63 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
63 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
64 | * |
64 | * |
65 | * @return New PTL0. |
65 | * @return New PTL0. |
66 | */ |
66 | */ |
67 | pte_t *ptl0_create(int flags) |
67 | pte_t *ptl0_create(int flags) |
68 | { |
68 | { |
69 | pte_t *src_ptl0, *dst_ptl0; |
69 | pte_t *src_ptl0, *dst_ptl0; |
70 | ipl_t ipl; |
70 | ipl_t ipl; |
71 | 71 | ||
72 | dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC))); |
72 | dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC))); |
73 | 73 | ||
74 | if (flags & FLAG_AS_KERNEL) { |
74 | if (flags & FLAG_AS_KERNEL) { |
75 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
75 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
76 | } else { |
76 | } else { |
77 | __address src, dst; |
77 | __address src, dst; |
78 | 78 | ||
79 | /* |
79 | /* |
80 | * Copy the kernel address space portion to new PTL0. |
80 | * Copy the kernel address space portion to new PTL0. |
81 | */ |
81 | */ |
82 | 82 | ||
83 | ipl = interrupts_disable(); |
83 | ipl = interrupts_disable(); |
84 | mutex_lock(&AS_KERNEL->lock); |
84 | mutex_lock(&AS_KERNEL->lock); |
85 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
85 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
86 | 86 | ||
87 | src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
87 | src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
88 | dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
88 | dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
89 | 89 | ||
90 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
90 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
91 | memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0)); |
91 | memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0)); |
92 | mutex_unlock(&AS_KERNEL->lock); |
92 | mutex_unlock(&AS_KERNEL->lock); |
93 | interrupts_restore(ipl); |
93 | interrupts_restore(ipl); |
94 | } |
94 | } |
95 | 95 | ||
96 | return (pte_t *) KA2PA((__address) dst_ptl0); |
96 | return (pte_t *) KA2PA((__address) dst_ptl0); |
97 | } |
97 | } |
98 | 98 | ||
99 | /** Destroy page table. |
99 | /** Destroy page table. |
100 | * |
100 | * |
101 | * Destroy PTL0, other levels are expected to be already deallocated. |
101 | * Destroy PTL0, other levels are expected to be already deallocated. |
102 | * |
102 | * |
103 | * @param page_table Physical address of PTL0. |
103 | * @param page_table Physical address of PTL0. |
104 | */ |
104 | */ |
105 | void ptl0_destroy(pte_t *page_table) |
105 | void ptl0_destroy(pte_t *page_table) |
106 | { |
106 | { |
107 | frame_free(ADDR2PFN((__address) page_table)); |
107 | frame_free(ADDR2PFN((__address) page_table)); |
108 | } |
108 | } |
109 | 109 | ||
110 | /** Lock page tables. |
110 | /** Lock page tables. |
111 | * |
111 | * |
112 | * Lock only the address space. |
112 | * Lock only the address space. |
113 | * Interrupts must be disabled. |
113 | * Interrupts must be disabled. |
114 | * |
114 | * |
115 | * @param as Address space. |
115 | * @param as Address space. |
116 | * @param lock If false, do not attempt to lock the address space. |
116 | * @param lock If false, do not attempt to lock the address space. |
117 | */ |
117 | */ |
118 | void pt_lock(as_t *as, bool lock) |
118 | void pt_lock(as_t *as, bool lock) |
119 | { |
119 | { |
120 | if (lock) |
120 | if (lock) |
121 | mutex_lock(&as->lock); |
121 | mutex_lock(&as->lock); |
122 | } |
122 | } |
123 | 123 | ||
124 | /** Unlock page tables. |
124 | /** Unlock page tables. |
125 | * |
125 | * |
126 | * Unlock the address space. |
126 | * Unlock the address space. |
127 | * Interrupts must be disabled. |
127 | * Interrupts must be disabled. |
128 | * |
128 | * |
129 | * @param as Address space. |
129 | * @param as Address space. |
130 | * @param unlock If false, do not attempt to unlock the address space. |
130 | * @param unlock If false, do not attempt to unlock the address space. |
131 | */ |
131 | */ |
132 | void pt_unlock(as_t *as, bool unlock) |
132 | void pt_unlock(as_t *as, bool unlock) |
133 | { |
133 | { |
134 | if (unlock) |
134 | if (unlock) |
135 | mutex_unlock(&as->lock); |
135 | mutex_unlock(&as->lock); |
136 | } |
136 | } |
137 | 137 |