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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_ */ |