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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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| 1266 | jermar | 28 | |
| 29 | /** |
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| 30 | * @file asid_fifo.c |
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| 31 | * @brief FIFO queue ASID management. |
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| 32 | * |
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| 33 | * Architectures that link with this file keep the unallocated ASIDs |
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| 34 | * in FIFO queue. The queue can be statically (e.g. mips32) or |
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| 35 | * dynamically allocated (e.g ia64 and sparc64). |
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| 36 | */ |
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| 730 | jermar | 37 | |
| 38 | #include <genarch/mm/asid_fifo.h> |
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| 39 | #include <arch/mm/asid.h> |
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| 40 | #include <mm/asid.h> |
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| 41 | #include <typedefs.h> |
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| 788 | jermar | 42 | #include <adt/fifo.h> |
| 730 | jermar | 43 | |
| 830 | jermar | 44 | #define FIFO_STATIC_LIMIT 1024 |
| 45 | #define FIFO_STATIC (ASIDS_ALLOCABLE<FIFO_STATIC_LIMIT) |
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| 831 | jermar | 46 | |
| 730 | jermar | 47 | /** |
| 48 | * FIFO queue containing unassigned ASIDs. |
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| 49 | * Can be only accessed when asidlock is held. |
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| 50 | */ |
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| 830 | jermar | 51 | #if FIFO_STATIC |
| 52 | FIFO_INITIALIZE_STATIC(free_asids, asid_t, ASIDS_ALLOCABLE); |
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| 53 | #else |
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| 54 | FIFO_INITIALIZE_DYNAMIC(free_asids, asid_t, ASIDS_ALLOCABLE); |
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| 55 | #endif |
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| 730 | jermar | 56 | |
| 57 | /** Initialize data structures for O(1) ASID allocation and deallocation. */ |
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| 58 | void asid_fifo_init(void) |
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| 59 | { |
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| 60 | int i; |
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| 830 | jermar | 61 | |
| 62 | #if (!FIFO_STATIC) |
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| 63 | fifo_create(free_asids); |
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| 64 | #endif |
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| 65 | |||
| 730 | jermar | 66 | for (i = 0; i < ASIDS_ALLOCABLE; i++) { |
| 67 | fifo_push(free_asids, ASID_START + i); |
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| 68 | } |
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| 69 | } |
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| 70 | |||
| 71 | /** Allocate free ASID. |
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| 72 | * |
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| 73 | * Allocation runs in O(1). |
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| 74 | * |
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| 75 | * @return Free ASID. |
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| 76 | */ |
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| 77 | asid_t asid_find_free(void) |
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| 78 | { |
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| 79 | return fifo_pop(free_asids); |
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| 80 | } |
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| 81 | |||
| 82 | /** Return ASID among free ASIDs. |
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| 83 | * |
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| 84 | * This operation runs in O(1). |
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| 85 | * |
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| 86 | * @param asid ASID being freed. |
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| 87 | */ |
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| 88 | void asid_put_arch(asid_t asid) |
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| 89 | { |
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| 90 | fifo_push(free_asids, asid); |
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| 91 | } |