1 /* $OpenBSD: param.h,v 1.11 1998/08/30 22:05:35 millert Exp $ */
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
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.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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
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
42 #ifndef _MACHINE_PARAM_H_
43 #define _MACHINE_PARAM_H_
45 #include <sys/cdefs.h>
48 #include <machine/psl.h>
50 #include <machine/cpu.h>
54 #define __PCI_REROUTE_INTERRUPT
57 #define MACHINE "mips"
60 #define MACHINE_ARCH "mips"
64 * OBJFORMAT_NAMES is a comma-separated list of the object formats
65 * that are supported on the architecture.
67 #define OBJFORMAT_NAMES "elf"
68 #define OBJFORMAT_DEFAULT "elf"
70 #define MID_MACHINE 0 /* None but has to be defined */
74 #define MAXCPU MAXSMPCPU
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.
86 #define _ALIGN(p) (((u_int)(p) + _ALIGNBYTES) &~ _ALIGNBYTES)
87 #define ALIGNED_POINTER(p, t) ((((u_int32_t)(p)) & (sizeof (t) - 1)) == 0)
89 #define ALIGNBYTES _ALIGNBYTES
90 #define ALIGN(p) _ALIGN(p)
92 #define NBPG 4096 /* bytes/page */
93 #define PGOFSET (NBPG-1) /* byte offset into page */
94 #define PGSHIFT 12 /* LOG2(NBPG) */
96 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
97 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
98 #define PAGE_MASK (PAGE_SIZE-1)
99 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
101 #define NBSEG 0x400000 /* bytes/segment */
102 #define SEGOFSET (NBSEG-1) /* byte offset into segment */
103 #define SEGSHIFT 22 /* LOG2(NBSEG) */
105 /* XXXimp: This has moved to vmparam.h */
106 /* Also, this differs from the mips2 definition, but likely is better */
107 /* since this means the kernel won't chew up TLBs when it is executing */
109 #define KERNBASE 0x80000000 /* start of kernel virtual */
110 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT)
112 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
113 #define BLKDEV_IOSIZE 2048
114 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
116 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
121 #define CLBYTES (CLSIZE * NBPG)
125 * NOTE: In FreeBSD, Uarea's don't have a fixed address.
126 * Therefore, any code imported from OpenBSD which depends on
127 * UADDR, UVPN and KERNELSTACK requires porting.
129 #define KSTACK_PAGES 3 /* kernel stack*/
130 #define KSTACK_GUARD_PAGES 0 /* pages of kstack guard; 0 disables */
135 * Constants related to network buffer management.
136 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
137 * on machines that exchange pages of input or output buffers with mbuf
138 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
139 * of the hardware page size.
142 #define MSIZE 256 /* size of an mbuf */
147 #endif /* MCLSHIFT */
148 #define MCLBYTES (1 << MCLSHIFT) /* enough for whole Ethernet packet */
149 #define MCLOFSET (MCLBYTES - 1)
152 * Size of kernel malloc arena in CLBYTES-sized logical pages
154 #ifndef NKMEMCLUSTERS
155 #define NKMEMCLUSTERS (4096*1024/CLBYTES)
158 /* pages ("clicks") (4096 bytes) to disk blocks */
159 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
160 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
163 #define ctob(x) ((x) << PGSHIFT)
164 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
166 /* bytes to disk blocks */
167 #define btodb(x) ((x) >> DEV_BSHIFT)
168 #define dbtob(x) ((x) << DEV_BSHIFT)
171 * Map a ``block device block'' to a file system block.
172 * This should be device dependent, and should use the bsize
173 * field from the disk label.
174 * For now though just use DEV_BSIZE.
176 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
181 #define mips_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
182 #define mips_trunc_page(x) ((unsigned)(x) & ~(NBPG-1))
183 #define mips_btop(x) ((unsigned)(x) >> PGSHIFT)
184 #define mips_ptob(x) ((unsigned)(x) << PGSHIFT)
185 #define round_page mips_round_page
186 #define trunc_page mips_trunc_page
187 #define atop(x) ((unsigned long)(x) >> PAGE_SHIFT)
188 #define ptoa(x) ((unsigned long)(x) << PAGE_SHIFT)
190 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
193 #define DELAY(n) { register int N = (n); while (--N > 0); }
194 #endif /* !_KERNEL */
196 #endif /* !_MACHINE_PARAM_H_ */