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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
36 #include <machine/_align.h>
38 #ifndef _I386_INCLUDE_PARAM_H_
39 #define _I386_INCLUDE_PARAM_H_
42 * Machine dependent constants for Intel 386.
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.
51 #define _ALIGNBYTES (sizeof(int) - 1)
54 #define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
60 #define __PCI_REROUTE_INTERRUPT
63 #define MACHINE "i386"
66 #define MACHINE_ARCH "i386"
68 #define MID_MACHINE MID_I386
70 #if defined(SMP) || defined(KLD_MODULE)
76 #endif /* SMP || KLD_MODULE */
78 #define ALIGNBYTES _ALIGNBYTES
79 #define ALIGN(p) _ALIGN(p)
81 * ALIGNED_POINTER is a boolean macro that checks whether an address
82 * is valid to fetch data elements of type t from on this architecture.
83 * This does not reflect the optimal alignment, just the possibility
84 * (within reasonable limits).
86 #define ALIGNED_POINTER(p, t) 1
89 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
90 * architecture. It should be used with appropriate caution.
92 #define CACHE_LINE_SHIFT 7
93 #define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT)
95 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
96 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
97 #define PAGE_MASK (PAGE_SIZE-1)
98 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
102 #define PDRSHIFT 21 /* LOG2(NBPDR) */
103 #define NPGPTD_SHIFT 9
106 #define PDRSHIFT 22 /* LOG2(NBPDR) */
107 #define NPGPTD_SHIFT 10
110 #define NBPTD (NPGPTD<<PAGE_SHIFT)
111 #define NPDEPTD (NBPTD/(sizeof (pd_entry_t)))
112 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
113 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
114 #define PDRMASK (NBPDR-1)
116 #define MAXPAGESIZES 2 /* maximum number of supported page sizes */
118 #define IOPAGES 2 /* pages of i/o permission bitmap */
121 #define KSTACK_PAGES 2 /* Includes pcb! */
123 #define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */
126 * Ceiling on amount of swblock kva space, can be changed via
127 * the kern.maxswzone /boot/loader.conf variable.
129 #ifndef VM_SWZONE_SIZE_MAX
130 #define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
134 * Ceiling on size of buffer cache (really only effects write queueing,
135 * the VM page cache is not effected), can be changed via
136 * the kern.maxbcache /boot/loader.conf variable.
138 #ifndef VM_BCACHE_SIZE_MAX
139 #define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024)
143 * Mach derived conversion macros
145 #define trunc_page(x) ((x) & ~PAGE_MASK)
146 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
147 #define trunc_4mpage(x) ((x) & ~PDRMASK)
148 #define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
150 #define atop(x) ((x) >> PAGE_SHIFT)
151 #define ptoa(x) ((x) << PAGE_SHIFT)
153 #define i386_btop(x) ((x) >> PAGE_SHIFT)
154 #define i386_ptob(x) ((x) << PAGE_SHIFT)
156 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
158 #endif /* !_I386_INCLUDE_PARAM_H_ */