param.h revision 210627 
1/*	$OpenBSD: param.h,v 1.11 1998/08/30 22:05:35 millert Exp $ */
2
3/*-
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1992, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department and Ralph Campbell.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	from: Utah Hdr: machparam.h 1.11 89/08/14
37 *	from: @(#)param.h	8.1 (Berkeley) 6/10/93
38 *	JNPR: param.h,v 1.6.2.1 2007/09/10 07:49:36 girish
39 * $FreeBSD: head/sys/mips/include/param.h 210627 2010-07-29 20:02:56Z jchandra $
40 */
41
42#ifndef _MIPS_INCLUDE_PARAM_H_
43#define	_MIPS_INCLUDE_PARAM_H_
44
45#include <machine/_align.h>
46
47#include <sys/cdefs.h>
48#ifdef _KERNEL
49#ifndef _LOCORE
50#include <machine/cpu.h>
51#endif
52#endif
53
54#define __PCI_REROUTE_INTERRUPT
55
56#ifndef MACHINE
57#define	MACHINE		"mips"
58#endif
59#ifndef MACHINE_ARCH
60#define	MACHINE_ARCH	"mips"
61#endif
62
63/*
64 * OBJFORMAT_NAMES is a comma-separated list of the object formats
65 * that are supported on the architecture.
66 */
67#define	OBJFORMAT_NAMES		"elf"
68#define	OBJFORMAT_DEFAULT	"elf"
69
70#define	MID_MACHINE	0	/* None but has to be defined */
71
72#ifdef SMP
73#define	MAXSMPCPU	32
74#define	MAXCPU		MAXSMPCPU
75#else
76#define	MAXSMPCPU	1
77#define	MAXCPU		1
78#endif
79
80/*
81 * Round p (pointer or byte index) up to a correctly-aligned value for all
82 * data types (int, long, ...).	  The result is u_int and must be cast to
83 * any desired pointer type.
84 */
85
86#define	ALIGNBYTES	_ALIGNBYTES
87#define	ALIGN(p)	_ALIGN(p)
88/*
89 * ALIGNED_POINTER is a boolean macro that checks whether an address
90 * is valid to fetch data elements of type t from on this architecture.
91 * This does not reflect the optimal alignment, just the possibility
92 * (within reasonable limits).
93 */
94#define	ALIGNED_POINTER(p, t)	((((unsigned long)(p)) & (sizeof (t) - 1)) == 0)
95
96/*
97 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
98 * architecture.  It should be used with appropriate caution.
99 */
100#define	CACHE_LINE_SHIFT	6
101#define	CACHE_LINE_SIZE		(1 << CACHE_LINE_SHIFT)
102
103#define	PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
104#define	PAGE_SIZE	(1<<PAGE_SHIFT) /* bytes/page */
105#define	PAGE_MASK	(PAGE_SIZE-1)
106
107#define	NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
108#define	NPDEPG		(PAGE_SIZE/(sizeof (pd_entry_t)))
109
110#define	SEGSHIFT	22		/* LOG2(NBSEG) */
111#define	NBSEG		(1 << SEGSHIFT)	/* bytes/segment */
112#define	SEGMASK		(NBSEG-1)	/* byte offset into segment */
113
114#define	MAXPAGESIZES	1		/* maximum number of supported page sizes */
115
116#define	BLKDEV_IOSIZE	2048		/* xxx: Why is this 1/2 page? */
117#define	MAXDUMPPGS	1		/* xxx: why is this only one? */
118
119/*
120 * The kernel stack needs to be aligned on a (PAGE_SIZE * 2) boundary.
121 */
122#define	KSTACK_PAGES		2	/* kernel stack*/
123#define	KSTACK_GUARD_PAGES	2	/* pages of kstack guard; 0 disables */
124
125#define	UPAGES			2
126
127/* pages ("clicks") (4096 bytes) to disk blocks */
128#define	ctod(x)		((x) << (PAGE_SHIFT - DEV_BSHIFT))
129#define	dtoc(x)		((x) >> (PAGE_SHIFT - DEV_BSHIFT))
130
131/*
132 * Map a ``block device block'' to a file system block.
133 * This should be device dependent, and should use the bsize
134 * field from the disk label.
135 * For now though just use DEV_BSIZE.
136 */
137#define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
138
139/*
140 * Mach derived conversion macros
141 */
142#define round_page(x)		(((unsigned long)(x) + PAGE_MASK) & ~PAGE_MASK)
143#define trunc_page(x)		((unsigned long)(x) & ~PAGE_MASK)
144
145#define atop(x)			((unsigned long)(x) >> PAGE_SHIFT)
146#define ptoa(x)			((unsigned long)(x) << PAGE_SHIFT)
147
148#define mips_btop(x)		((unsigned long)(x) >> PAGE_SHIFT)
149#define mips_ptob(x)		((unsigned long)(x) << PAGE_SHIFT)
150
151#define	pgtok(x)		((unsigned long)(x) * (PAGE_SIZE / 1024))
152
153#ifndef _KERNEL
154#define	DELAY(n)	{ register int N = (n); while (--N > 0); }
155#endif /* !_KERNEL */
156
157#endif /* !_MIPS_INCLUDE_PARAM_H_ */
158