param.h revision 195376 
1/*-
2 * Copyright (c) 2001 David E. O'Brien
3 * Copyright (c) 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * William Jolitz.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	from: @(#)param.h	5.8 (Berkeley) 6/28/91
38 * $FreeBSD: head/sys/powerpc/include/param.h 195376 2009-07-05 17:45:48Z sam $
39 */
40
41/*
42 * Machine dependent constants for PowerPC (32-bit only currently)
43 */
44
45/*
46 * Round p (pointer or byte index) up to a correctly-aligned value
47 * for all data types (int, long, ...).   The result is unsigned int
48 * and must be cast to any desired pointer type.
49 */
50#ifndef _ALIGNBYTES
51#define	_ALIGNBYTES	(sizeof(int) - 1)
52#endif
53#ifndef _ALIGN
54#define	_ALIGN(p)	(((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
55#endif
56
57#ifndef _NO_NAMESPACE_POLLUTION
58
59/* Needed to display interrupts on OFW PCI */
60#define __PCI_REROUTE_INTERRUPT
61
62#ifndef _MACHINE_PARAM_H_
63#define	_MACHINE_PARAM_H_
64
65#ifndef MACHINE
66#define	MACHINE		"powerpc"
67#endif
68#ifndef MACHINE_ARCH
69#define	MACHINE_ARCH	"powerpc"
70#endif
71#define	MID_MACHINE	MID_POWERPC
72
73#if defined(SMP) || defined(KLD_MODULE)
74#define	MAXCPU		2
75#else
76#define	MAXCPU		1
77#endif /* SMP || KLD_MODULE */
78
79#define	ALIGNBYTES	_ALIGNBYTES
80#define	ALIGN(p)	_ALIGN(p)
81/*
82 * ALIGNED_POINTER is a boolean macro that checks whether an address
83 * is valid to fetch data elements of type t from on this architecture.
84 * This does not reflect the optimal alignment, just the possibility
85 * (within reasonable limits).
86 */
87#define	ALIGNED_POINTER(p, t)	((((unsigned)(p)) & (sizeof (t) - 1)) == 0)
88
89/*
90 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
91 * architecture.  It should be used with appropriate caution.
92 */
93#define	CACHE_LINE_SHIFT	7
94#define	CACHE_LINE_SIZE		(1 << CACHE_LINE_SHIFT)
95
96#define	PAGE_SHIFT	12
97#define	PAGE_SIZE	(1 << PAGE_SHIFT)	/* Page size */
98#define	PAGE_MASK	(PAGE_SIZE - 1)
99#define	NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
100
101#ifndef KSTACK_PAGES
102#define	KSTACK_PAGES		4		/* includes pcb */
103#endif
104#define	KSTACK_GUARD_PAGES	1	/* pages of kstack guard; 0 disables */
105#define	USPACE		(KSTACK_PAGES * PAGE_SIZE)	/* total size of pcb */
106
107/*
108 * Mach derived conversion macros
109 */
110#define	trunc_page(x)		((unsigned long)(x) & ~(PAGE_MASK))
111#define	round_page(x)		(((x) + PAGE_MASK) & ~PAGE_MASK)
112#define	trunc_4mpage(x)		((unsigned)(x) & ~PDRMASK)
113#define	round_4mpage(x)		((((unsigned)(x)) + PDRMASK) & ~PDRMASK)
114
115#define	atop(x)			((unsigned long)(x) >> PAGE_SHIFT)
116#define	ptoa(x)			((unsigned long)(x) << PAGE_SHIFT)
117
118#define	powerpc_btop(x)		((unsigned)(x) >> PAGE_SHIFT)
119#define	powerpc_ptob(x)		((unsigned)(x) << PAGE_SHIFT)
120
121#define	pgtok(x)		((x) * (PAGE_SIZE / 1024))
122
123#endif /* !_MACHINE_PARAM_H_ */
124#endif /* !_NO_NAMESPACE_POLLUTION */
125