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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/asid_fifo.h> |
29 | #include <genarch/mm/asid_fifo.h> |
30 | #include <arch/mm/asid.h> |
30 | #include <arch/mm/asid.h> |
31 | #include <mm/asid.h> |
31 | #include <mm/asid.h> |
32 | #include <typedefs.h> |
32 | #include <typedefs.h> |
33 | #include <fifo.h> |
33 | #include <adt/fifo.h> |
34 | 34 | ||
35 | /** |
35 | /** |
36 | * FIFO queue containing unassigned ASIDs. |
36 | * FIFO queue containing unassigned ASIDs. |
37 | * Can be only accessed when asidlock is held. |
37 | * Can be only accessed when asidlock is held. |
38 | */ |
38 | */ |
39 | FIFO_INITIALIZE(free_asids, asid_t, ASIDS_ALLOCABLE); |
39 | FIFO_INITIALIZE(free_asids, asid_t, ASIDS_ALLOCABLE); |
40 | 40 | ||
41 | /** Initialize data structures for O(1) ASID allocation and deallocation. */ |
41 | /** Initialize data structures for O(1) ASID allocation and deallocation. */ |
42 | void asid_fifo_init(void) |
42 | void asid_fifo_init(void) |
43 | { |
43 | { |
44 | int i; |
44 | int i; |
45 | 45 | ||
46 | for (i = 0; i < ASIDS_ALLOCABLE; i++) { |
46 | for (i = 0; i < ASIDS_ALLOCABLE; i++) { |
47 | fifo_push(free_asids, ASID_START + i); |
47 | fifo_push(free_asids, ASID_START + i); |
48 | } |
48 | } |
49 | } |
49 | } |
50 | 50 | ||
51 | /** Allocate free ASID. |
51 | /** Allocate free ASID. |
52 | * |
52 | * |
53 | * Allocation runs in O(1). |
53 | * Allocation runs in O(1). |
54 | * |
54 | * |
55 | * @return Free ASID. |
55 | * @return Free ASID. |
56 | */ |
56 | */ |
57 | asid_t asid_find_free(void) |
57 | asid_t asid_find_free(void) |
58 | { |
58 | { |
59 | return fifo_pop(free_asids); |
59 | return fifo_pop(free_asids); |
60 | } |
60 | } |
61 | 61 | ||
62 | /** Return ASID among free ASIDs. |
62 | /** Return ASID among free ASIDs. |
63 | * |
63 | * |
64 | * This operation runs in O(1). |
64 | * This operation runs in O(1). |
65 | * |
65 | * |
66 | * @param asid ASID being freed. |
66 | * @param asid ASID being freed. |
67 | */ |
67 | */ |
68 | void asid_put_arch(asid_t asid) |
68 | void asid_put_arch(asid_t asid) |
69 | { |
69 | { |
70 | fifo_push(free_asids, asid); |
70 | fifo_push(free_asids, asid); |
71 | } |
71 | } |
72 | 72 |