Rev 730 | Rev 830 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 730 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 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 |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 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 |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 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 |
||
| 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 |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | #include <genarch/mm/asid_fifo.h> |
||
| 30 | #include <arch/mm/asid.h> |
||
| 31 | #include <mm/asid.h> |
||
| 32 | #include <typedefs.h> |
||
| 788 | jermar | 33 | #include <adt/fifo.h> |
| 730 | jermar | 34 | |
| 35 | /** |
||
| 36 | * FIFO queue containing unassigned ASIDs. |
||
| 37 | * Can be only accessed when asidlock is held. |
||
| 38 | */ |
||
| 39 | FIFO_INITIALIZE(free_asids, asid_t, ASIDS_ALLOCABLE); |
||
| 40 | |||
| 41 | /** Initialize data structures for O(1) ASID allocation and deallocation. */ |
||
| 42 | void asid_fifo_init(void) |
||
| 43 | { |
||
| 44 | int i; |
||
| 45 | |||
| 46 | for (i = 0; i < ASIDS_ALLOCABLE; i++) { |
||
| 47 | fifo_push(free_asids, ASID_START + i); |
||
| 48 | } |
||
| 49 | } |
||
| 50 | |||
| 51 | /** Allocate free ASID. |
||
| 52 | * |
||
| 53 | * Allocation runs in O(1). |
||
| 54 | * |
||
| 55 | * @return Free ASID. |
||
| 56 | */ |
||
| 57 | asid_t asid_find_free(void) |
||
| 58 | { |
||
| 59 | return fifo_pop(free_asids); |
||
| 60 | } |
||
| 61 | |||
| 62 | /** Return ASID among free ASIDs. |
||
| 63 | * |
||
| 64 | * This operation runs in O(1). |
||
| 65 | * |
||
| 66 | * @param asid ASID being freed. |
||
| 67 | */ |
||
| 68 | void asid_put_arch(asid_t asid) |
||
| 69 | { |
||
| 70 | fifo_push(free_asids, asid); |
||
| 71 | } |