2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
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: @(#)param.h 5.8 (Berkeley) 6/28/91
37 * $FreeBSD: src/sys/i386/include/param.h,v 1.54.2.8 2002/08/31 21:15:55 dillon Exp $
43 * Do not prevent re-includes of <machine/param.h> if the file was included
44 * with NO_NAMESPACE_POLLUTION, or expected macros will not exist.
46 #ifndef _NO_NAMESPACE_POLLUTION
51 * Machine dependent constants for Intel 386.
53 #ifndef _CPU_PARAM_H1_
54 #define _CPU_PARAM_H1_
57 * Round p (pointer or byte index) up to a correctly-aligned value
58 * for all data types (int, long, ...). The result is unsigned int
59 * and must be cast to any desired pointer type.
62 #define _ALIGNBYTES (sizeof(int) - 1)
65 #define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
69 #define _MACHINE i386 /* cpu architecture */
72 #define _MACHINE_ARCH i386 /* cpu architecture */
75 #endif /* _CPU_PARAM_H1_ */
77 #ifndef _NO_NAMESPACE_POLLUTION
80 #define MACHINE "i386" /* cpu architecture */
83 #define MACHINE_ARCH "i386" /* cpu architecture */
86 #define MID_MACHINE MID_I386
89 * Use SMP_MAXCPU instead of MAXCPU for structures that are intended to
90 * remain compatible between UP and SMP builds.
92 * NOTE: Max supported cpus is 32 because we use 32 bit cpu masks. On
93 * 32-bit systems the kernel build defaults SMP_MAXCPU to 16 to
94 * reduce KVM overhead, but can be increased up to 32.
99 #define MAXCPU SMP_MAXCPU
101 #define ALIGNBYTES _ALIGNBYTES
102 #define ALIGN(p) _ALIGN(p)
104 #define PAGE_SHIFT 12
105 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes per mmu page (level 2) */
106 #define PAGE_MASK (PAGE_SIZE-1)
107 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
110 #define SEG_SIZE (1<<SEG_SHIFT) /* bytes per mmu segment (level 1) */
111 #define SEG_MASK (SEG_SIZE-1)
113 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
114 #define PDRSHIFT 22 /* LOG2(NBPDR) */
115 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
116 #define PDRMASK (NBPDR-1)
118 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
119 #define DEV_BSIZE (1 << DEV_BSHIFT)
120 #define DEV_BMASK (DEV_BSIZE - 1)
122 #ifndef BLKDEV_IOSIZE
123 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
125 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
126 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
127 #define MAXDUMPPGS (MAXPHYS/PAGE_SIZE)
129 #define IOPAGES 2 /* pages of i/o permission bitmap */
130 #define UPAGES 4 /* pages of u-area */
133 * 32-bit machines do not have enough KVA, improve buffer cache
134 * density at the cost of higher defragmentation and buffer_map
135 * handling overheads.
137 #define BKVASIZE 16384 /* override 64K default */
140 * Ceiling on amount of swblock kva space, can be changed via
141 * kern.maxswzone /boot/loader.conf variable.
143 #ifndef VM_SWZONE_SIZE_MAX
144 #define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
148 * Ceiling on size of buffer cache (really only effects write queueing,
149 * the VM page cache is not effected), can be changed via
150 * kern.maxbcache /boot/loader.conf variable.
152 #ifndef VM_BCACHE_SIZE_MAX
153 #define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024)
157 * Some macros for units conversion
160 /* clicks to bytes */
161 #define ctob(x) ((x)<<PAGE_SHIFT)
163 /* bytes to clicks */
164 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
167 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
168 * want to shift an unsigned type to avoid sign extension and we don't
169 * want to widen `bytes' unnecessarily. Assume that the result fits in
172 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
173 (sizeof (bytes) > sizeof(long) \
174 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
175 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
177 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
178 ((off_t)(db) << DEV_BSHIFT)
181 * Mach derived conversion macros
183 #define trunc_page(x) ((x) & ~PAGE_MASK)
184 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
185 #define trunc_4mpage(x) ((x) & ~PDRMASK)
186 #define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
188 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
189 #define atop(x) ((x) >> PAGE_SHIFT)
191 #define ptoa(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
193 #define i386_btop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
194 #define i386_ptob(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
196 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
201 * We put here the definition of two debugging macros/function which
202 * are very convenient to have available.
203 * The macro is called TSTMP() and is used to timestamp events in the
204 * kernel using the TSC register, and export them to userland through
205 * the sysctl variable debug.timestamp, which is a circular buffer
206 * holding pairs of u_int32_t variables <timestamp, argument> .
207 * They can be retrieved with something like
209 * sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
211 * The function _TSTMP() is defined in i386/isa/clock.c. It does not
212 * try to grab any locks or block interrupts or identify which CPU it
213 * is running on. You are supposed to know what to do if you use it.
215 * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
216 * config file, otherwise they default to an empty block.
219 #ifdef KERN_TIMESTAMP
220 extern void _TSTMP(u_int32_t argument);
221 #define TSTMP(class, unit, event, par) _TSTMP( \
222 (((class) & 0x0f) << 28 ) | \
223 (((unit) & 0x0f) << 24 ) | \
224 (((event) & 0xff) << 16 ) | \
225 (((par) & 0xffff) ) )
227 #else /* !KERN_TIMESTAMP */
229 #define TSTMP(class, unit, event, par) _TSTMP(0)
230 #endif /* !KERN_TIMESTAMP */
233 #endif /* !_NO_NAMESPACE_POLLUTION */
234 #endif /* !_CPU_PARAM_H_ */