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| 2 | pj | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 10 | * (see the web pages for full authors list) |
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| 11 | * |
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| 12 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 13 | * |
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| 14 | * http://www.sssup.it |
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| 15 | * http://retis.sssup.it |
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| 16 | * http://shark.sssup.it |
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| 17 | */ |
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| 18 | |||
| 19 | /** |
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| 20 | ------------ |
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| 21 | CVS : $Id: addfree.c,v 1.1.1.1 2002-03-29 14:12:52 pj Exp $ |
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| 22 | |||
| 23 | File: $File$ |
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| 24 | Revision: $Revision: 1.1.1.1 $ |
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| 25 | Last update: $Date: 2002-03-29 14:12:52 $ |
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| 26 | ------------ |
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| 27 | |||
| 28 | this code is from: |
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| 29 | List-based Memory Management, from OsKit. |
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| 30 | |||
| 31 | **/ |
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| 32 | |||
| 33 | /* |
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| 34 | * Copyright (C) 2000 Paolo Gai |
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| 35 | * |
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| 36 | * This program is free software; you can redistribute it and/or modify |
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| 37 | * it under the terms of the GNU General Public License as published by |
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| 38 | * the Free Software Foundation; either version 2 of the License, or |
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| 39 | * (at your option) any later version. |
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| 40 | * |
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| 41 | * This program is distributed in the hope that it will be useful, |
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| 42 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 43 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 44 | * GNU General Public License for more details. |
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| 45 | * |
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| 46 | * You should have received a copy of the GNU General Public License |
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| 47 | * along with this program; if not, write to the Free Software |
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| 48 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 49 | * |
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| 50 | */ |
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| 51 | |||
| 52 | /* |
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| 53 | * Copyright (c) 1995, 1998 University of Utah and the Flux Group. |
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| 54 | * All rights reserved. |
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| 55 | * |
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| 56 | * This file is part of the Flux OSKit. The OSKit is free software, also known |
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| 57 | * as "open source;" you can redistribute it and/or modify it under the terms |
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| 58 | * of the GNU General Public License (GPL), version 2, as published by the Free |
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| 59 | * Software Foundation (FSF). To explore alternate licensing terms, contact |
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| 60 | * the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271. |
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| 61 | * |
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| 62 | * The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 63 | * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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| 64 | * FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have |
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| 65 | * received a copy of the GPL along with the OSKit; see the file COPYING. If |
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| 66 | * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA. |
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| 67 | */ |
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| 68 | |||
| 69 | #include <kernel/lmm.h> |
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| 70 | #define assert(test) assertk(test) |
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| 71 | |||
| 72 | void lmm_add_free(lmm_t *lmm, void *block, size_t size) |
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| 73 | { |
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| 74 | struct lmm_region *reg; |
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| 75 | DWORD min = (DWORD)block; |
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| 76 | DWORD max = min + size; |
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| 77 | |||
| 78 | /* Restrict the min and max further to be properly aligned. |
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| 79 | Note that this is the opposite of what lmm_free() does, |
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| 80 | because lmm_free() assumes the block was allocated with lmm_alloc() |
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| 81 | and thus would be a subset of a larger, already-aligned free block. |
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| 82 | Here we can assume no such thing. */ |
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| 83 | min = (min + ALIGN_MASK) & ~ALIGN_MASK; |
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| 84 | max &= ~ALIGN_MASK; |
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| 85 | assert(max >= min); |
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| 86 | |||
| 87 | /* If after alignment we have nothing left, we're done. */ |
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| 88 | if (max == min) |
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| 89 | return; |
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| 90 | |||
| 91 | /* Add the block to the free list(s) of whatever region(s) it overlaps. |
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| 92 | If some or all of the block doesn't fall into any existing region, |
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| 93 | then that memory is simply dropped on the floor. */ |
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| 94 | for (reg = lmm->regions; reg; reg = reg->next) |
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| 95 | { |
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| 96 | assert(reg->min < reg->max); |
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| 97 | assert((reg->min & ALIGN_MASK) == 0); |
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| 98 | assert((reg->max & ALIGN_MASK) == 0); |
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| 99 | |||
| 100 | if ((max > reg->min) && (min < reg->max)) |
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| 101 | { |
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| 102 | DWORD new_min = min, new_max = max; |
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| 103 | |||
| 104 | /* Only add the part of the block |
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| 105 | that actually falls within this region. */ |
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| 106 | if (new_min < reg->min) |
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| 107 | new_min = reg->min; |
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| 108 | if (new_max > reg->max) |
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| 109 | new_max = reg->max; |
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| 110 | assert(new_max > new_min); |
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| 111 | |||
| 112 | /* Add the block. */ |
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| 113 | lmm_free(lmm, (void*)new_min, new_max - new_min); |
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| 114 | } |
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| 115 | } |
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| 116 | } |
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| 117 |