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| 730 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include <genarch/mm/asid_fifo.h> |
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| 30 | #include <arch/mm/asid.h> |
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| 31 | #include <mm/asid.h> |
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| 32 | #include <typedefs.h> |
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| 33 | #include <fifo.h> |
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| 34 | |||
| 35 | /** |
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| 36 | * FIFO queue containing unassigned ASIDs. |
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| 37 | * Can be only accessed when asidlock is held. |
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| 38 | */ |
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| 39 | FIFO_INITIALIZE(free_asids, asid_t, ASIDS_ALLOCABLE); |
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| 40 | |||
| 41 | /** Initialize data structures for O(1) ASID allocation and deallocation. */ |
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| 42 | void asid_fifo_init(void) |
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| 43 | { |
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| 44 | int i; |
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| 45 | |||
| 46 | for (i = 0; i < ASIDS_ALLOCABLE; i++) { |
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| 47 | fifo_push(free_asids, ASID_START + i); |
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| 48 | } |
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| 49 | } |
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| 50 | |||
| 51 | /** Allocate free ASID. |
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| 52 | * |
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| 53 | * Allocation runs in O(1). |
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| 54 | * |
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| 55 | * @return Free ASID. |
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| 56 | */ |
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| 57 | asid_t asid_find_free(void) |
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| 58 | { |
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| 59 | return fifo_pop(free_asids); |
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| 60 | } |
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| 61 | |||
| 62 | /** Return ASID among free ASIDs. |
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| 63 | * |
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| 64 | * This operation runs in O(1). |
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| 65 | * |
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| 66 | * @param asid ASID being freed. |
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| 67 | */ |
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| 68 | void asid_put_arch(asid_t asid) |
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| 69 | { |
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| 70 | fifo_push(free_asids, asid); |
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| 71 | } |