![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to vm_param.h CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Apple XNU] / XNU / osfmk / mach|
Return to vm_param.h CVS log | Up to [Apple XNU] / XNU / osfmk / mach |
1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: * @OSF_COPYRIGHT@
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: */
52: /*
53: * File: mach/vm_param.h
54: * Author: Avadis Tevanian, Jr., Michael Wayne Young
55: * Date: 1985
56: *
57: * Machine independent virtual memory parameters.
58: *
59: */
60:
61: #ifndef _MACH_VM_PARAM_H_
62: #define _MACH_VM_PARAM_H_
63:
64: #ifndef KERNEL_PRIVATE
65:
66: #error YOU HAVE MADE A MISTAKE BY INCLUDING THIS FILE;
67: #error
68: #error THIS FILE SHOULD NOT BE VISIBLE TO USER PROGRAMS.
69: #error
70: #error USE <mach/machine/vm_param.h> TO GET MACHINE-DEPENDENT ADDRESS
71: #error SPACE AND PAGE SIZE ITEMS.
72: #error
73: #error USE <mach/machine/vm_types.h> TO GET TYPE DECLARATIONS USED IN
74: #error THE MACH KERNEL INTERFACE.
75: #error
76: #error IN ALL PROBABILITY, YOU SHOULD GET ALL OF THE TYPES USED IN THE
77: #error INTERFACE FROM <mach/mach_types.h>
78:
79: #endif /* KERNEL_PRIVATE */
80:
81: #include <mach/machine/vm_param.h>
82: #include <mach/machine/vm_types.h>
83:
84: /*
85: * The machine independent pages are refered to as PAGES. A page
86: * is some number of hardware pages, depending on the target machine.
87: */
88:
89: /*
90: * All references to the size of a page should be done with PAGE_SIZE
91: * or PAGE_SHIFT. The fact they are variables is hidden here so that
92: * we can easily make them constant if we so desire.
93: */
94:
95: /*
96: * Regardless whether it is implemented with a constant or a variable,
97: * the PAGE_SIZE is assumed to be a power of two throughout the
98: * virtual memory system implementation.
99: */
100:
101: #ifndef PAGE_SIZE_FIXED
102: extern vm_size_t page_size;
103: extern vm_size_t page_mask;
104: extern int page_shift;
105:
106: #define PAGE_SIZE page_size /* size of page in addressible units */
107: #define PAGE_SHIFT page_shift /* number of bits to shift for pages */
108: #define PAGE_MASK page_mask /* mask for offset within page */
109: #else /* PAGE_SIZE_FIXED */
110: #define PAGE_SIZE 4096
111: #define PAGE_SHIFT 12
112: #define PAGE_MASK (PAGE_SIZE-1)
113: #endif /* PAGE_SIZE_FIXED */
114:
115: #ifndef ASSEMBLER
116: /*
117: * Convert addresses to pages and vice versa.
118: * No rounding is used.
119: */
120:
121: #define atop(x) (((natural_t)(x)) >> PAGE_SHIFT)
122: #define ptoa(x) ((vm_offset_t)((x) << PAGE_SHIFT))
123:
124: /*
125: * Round off or truncate to the nearest page. These will work
126: * for either addresses or counts. (i.e. 1 byte rounds to 1 page
127: * bytes.
128: */
129:
130: #define round_page(x) ((vm_offset_t)((((vm_offset_t)(x)) + PAGE_MASK) & ~PAGE_MASK))
131: #define trunc_page(x) ((vm_offset_t)(((vm_offset_t)(x)) & ~PAGE_MASK))
132:
133: /*
134: * Determine whether an address is page-aligned, or a count is
135: * an exact page multiple.
136: */
137:
138: #define page_aligned(x) ((((vm_offset_t) (x)) & PAGE_MASK) == 0)
139:
140: extern vm_size_t mem_size; /* size of physical memory (bytes) */
141:
142: #endif /* ASSEMBLER */
143: #endif /* _MACH_VM_PARAM_H_ */
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.