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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /*
26: * Mach Operating System
27: * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
28: * All Rights Reserved.
29: *
30: * Permission to use, copy, modify and distribute this software and its
31: * documentation is hereby granted, provided that both the copyright
32: * notice and this permission notice appear in all copies of the
33: * software, derivative works or modified versions, and any portions
34: * thereof, and that both notices appear in supporting documentation.
35: *
36: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
37: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
38: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
39: *
40: * Carnegie Mellon requests users of this software to return to
41: *
42: * Software Distribution Coordinator or [email protected]
43: * School of Computer Science
44: * Carnegie Mellon University
45: * Pittsburgh PA 15213-3890
46: *
47: * any improvements or extensions that they make and grant Carnegie Mellon
48: * the rights to redistribute these changes.
49: */
50: /*
51: * File: mach/vm_param.h
52: * Author: Avadis Tevanian, Jr., Michael Wayne Young
53: * Date: 1985
54: *
55: * Machine independent virtual memory parameters.
56: *
57: */
58:
59: #ifndef _MACH_VM_PARAM_H_
60: #define _MACH_VM_PARAM_H_
61:
62: #import <mach/machine/vm_param.h>
63: #import <mach/machine/vm_types.h>
64:
65: #ifdef KERNEL
66: /*
67: * The machine independent pages are refered to as PAGES. A page
68: * is some number of hardware pages, depending on the target machine.
69: */
70:
71: /*
72: * All references to the size of a page should be done with PAGE_SIZE
73: * or PAGE_SHIFT. The fact they are variables is hidden here so that
74: * we can easily make them constant if we so desire.
75: */
76:
77: /*
78: * Regardless whether it is implemented with a constant or a variable,
79: * the PAGE_SIZE is assumed to be a power of two throughout the
80: * virtual memory system implementation.
81: */
82:
83: #ifndef PAGE_SIZE_FIXED
84: #define PAGE_SIZE page_size /* size of page in addressible units */
85: #define PAGE_SHIFT page_shift /* number of bits to shift for pages */
86: #endif /* PAGE_SIZE_FIXED */
87:
88: #ifndef __ASSEMBLER__
89: /*
90: * Convert addresses to pages and vice versa.
91: * No rounding is used.
92: */
93:
94: #define atop(x) (((vm_size_t)(x)) >> page_shift)
95: #define ptoa(x) ((vm_offset_t)((x) << page_shift))
96:
97: /*
98: * Round off or truncate to the nearest page. These will work
99: * for either addresses or counts. (i.e. 1 byte rounds to 1 page
100: * bytes.
101: */
102:
103: #define round_page(x) ((vm_offset_t)((((vm_offset_t)(x)) + page_mask) & ~page_mask))
104: #define trunc_page(x) ((vm_offset_t)(((vm_offset_t)(x)) & ~page_mask))
105:
106: /*
107: * Determine whether an address is page-aligned, or a count is
108: * an exact page multiple.
109: */
110:
111: #define page_aligned(x) ((((vm_offset_t) (x)) & page_mask) == 0)
112:
113: #ifndef PAGE_SIZE_FIXED
114: extern vm_size_t page_size; /* machine independent page size */
115: extern vm_size_t page_mask; /* page_size - 1; mask for
116: offset within page */
117: extern int page_shift; /* shift to use for page size */
118: #else /* PAGE_SIZE_FIXED */
119: #define page_mask (PAGE_SIZE-1)
120: #endif /* PAGE_SIZE_FIXED */
121:
122: extern vm_size_t mem_size; /* size of physical memory (bytes) */
123: extern vm_offset_t first_addr; /* first physical page */
124: extern vm_offset_t last_addr; /* last physical page */
125:
126: #endif /* __ASSEMBLER__ */
127:
128: #else
129: #define round_page(x) ((((vm_offset_t)(x) + (vm_page_size - 1)) \
130: / vm_page_size) * vm_page_size)
131: #define trunc_page(x) ((((vm_offset_t)(x)) / vm_page_size) * vm_page_size)
132: #endif
133:
134: #endif /* _MACH_VM_PARAM_H_ */
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