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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: addregio.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_region(lmm_t *lmm, lmm_region_t *reg, |
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73 | void *addr, size_t size, |
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74 | lmm_flags_t flags, lmm_pri_t pri) |
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75 | { |
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76 | DWORD min = (DWORD)addr; |
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77 | DWORD max = min + size; |
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78 | struct lmm_region **rp, *r; |
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79 | |||
80 | /* Align the start and end addresses appropriately. */ |
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81 | min = (min + ALIGN_MASK) & ~ALIGN_MASK; |
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82 | max &= ~ALIGN_MASK; |
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83 | |||
84 | /* If there's not enough memory to do anything with, |
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85 | then just drop the region on the floor. |
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86 | Since we haven't put it on the lmm's list, |
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87 | we'll never see it again. */ |
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88 | if (max <= min) |
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89 | return; |
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90 | |||
91 | /* Initialize the new region header. */ |
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92 | reg->nodes = 0; |
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93 | reg->min = min; |
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94 | reg->max = max; |
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95 | reg->flags = flags; |
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96 | reg->pri = pri; |
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97 | reg->free = 0; |
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98 | |||
99 | /* Add the region to the lmm's region list in descending priority order. |
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100 | For regions with the same priority, sort from largest to smallest |
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101 | to reduce the average amount of list traversing we need to do. */ |
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102 | for (rp = &lmm->regions; |
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103 | (r = *rp) && ((r->pri > pri) || |
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104 | ((r->pri == pri) && |
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105 | (r->max - r->min > reg->max - reg->min))); |
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106 | rp = &r->next) |
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107 | { |
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108 | assert(r != reg); |
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109 | assert((reg->max <= r->min) || (reg->min >= r->max)); |
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110 | } |
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111 | reg->next = r; |
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112 | *rp = reg; |
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113 | } |
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114 |