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2 | pj | 1 | /* |
2 | * Copyright (c) 1994-1997 The University of Utah and the Flux Group. |
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3 | * All rights reserved. |
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4 | * |
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5 | * This file is part of the Flux OSKit. The OSKit is free software, also known |
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6 | * as "open source;" you can redistribute it and/or modify it under the terms |
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7 | * of the GNU General Public License (GPL), version 2, as published by the Free |
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8 | * Software Foundation (FSF). To explore alternate licensing terms, contact |
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9 | * the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271. |
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10 | * |
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11 | * The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY |
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12 | * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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13 | * FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have |
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14 | * received a copy of the GPL along with the OSKit; see the file COPYING. If |
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15 | * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA. |
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16 | */ |
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17 | |||
18 | /* |
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19 | * Mach Operating System |
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20 | * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University. |
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21 | * All Rights Reserved. |
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22 | * |
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23 | * Permission to use, copy, modify and distribute this software and its |
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24 | * documentation is hereby granted, provided that both the copyright |
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25 | * notice and this permission notice appear in all copies of the |
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26 | * software, derivative works or modified versions, and any portions |
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27 | * thereof, and that both notices appear in supporting documentation. |
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28 | * |
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29 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
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30 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
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31 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
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32 | * |
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33 | * Carnegie Mellon requests users of this software to return to |
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34 | * |
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35 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
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36 | * School of Computer Science |
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37 | * Carnegie Mellon University |
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38 | * Pittsburgh PA 15213-3890 |
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39 | * |
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40 | * any improvements or extensions that they make and grant Carnegie Mellon |
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41 | * the rights to redistribute these changes. |
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42 | */ |
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43 | /* |
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44 | * File: oskit/page.h |
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45 | * Author: Avadis Tevanian, Jr., Michael Wayne Young |
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46 | * |
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47 | * Machine independent virtual memory parameters. |
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48 | * In this file, the term "page" refers to the _minimum_ page size |
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49 | * supported by the hardware architecture, and is always a power of two. |
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50 | * Some architectures and OS environments support optional |
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51 | * larger page sizes as well, and/or unaligned "block mappings". |
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52 | */ |
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53 | #ifndef __KERNEL_MEM_PAGE_H__ |
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54 | #define __KERNEL_MEM_PAGE_H__ |
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55 | |||
56 | /* was in machine/page.h */ |
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57 | #define PAGE_SHIFT 12 |
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58 | |||
59 | #ifndef PAGE_SIZE |
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60 | #define PAGE_SIZE (1 << PAGE_SHIFT) |
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61 | #endif |
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62 | |||
63 | #ifndef PAGE_MASK |
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64 | #define PAGE_MASK (PAGE_SIZE-1) |
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65 | #endif |
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66 | |||
67 | /* |
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68 | * Convert addresses to pages and vice versa. |
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69 | * No rounding is used. |
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70 | */ |
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71 | |||
72 | #define atop(x) (((oskit_size_t)(x)) >> PAGE_SHIFT) |
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73 | #define ptoa(x) ((oskit_addr_t)((x) << PAGE_SHIFT)) |
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74 | |||
75 | /* |
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76 | * Round off or truncate to the nearest page. These will work |
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77 | * for either addresses or counts. (i.e. 1 byte rounds to 1 page |
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78 | * bytes. |
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79 | */ |
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80 | |||
81 | #define round_page(x) ((oskit_addr_t)((((oskit_addr_t)(x)) + PAGE_MASK) & ~PAGE_MASK)) |
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82 | #define trunc_page(x) ((oskit_addr_t)(((oskit_addr_t)(x)) & ~PAGE_MASK)) |
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83 | |||
84 | /* |
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85 | * Determine whether an address is page-aligned, or a count is |
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86 | * an exact page multiple. |
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87 | */ |
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88 | |||
89 | #define page_aligned(x) ((((oskit_addr_t) (x)) & PAGE_MASK) == 0) |
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90 | |||
91 | #endif /* _OSKIT_PAGE_H_ */ |