1/*-
  2 * SPDX-License-Identifier: BSD-3-Clause
  3 *
  4 * Copyright (c) 1990 The Regents of the University of California.
  5 * All rights reserved.
  6 *
  7 * This code is derived from software contributed to Berkeley by
  8 * William Jolitz.
  9 *
 10 * Redistribution and use in source and binary forms, with or without
 11 * modification, are permitted provided that the following conditions
 12 * are met:
 13 * 1. Redistributions of source code must retain the above copyright
 14 *    notice, this list of conditions and the following disclaimer.
 15 * 2. Redistributions in binary form must reproduce the above copyright
 16 *    notice, this list of conditions and the following disclaimer in the
 17 *    documentation and/or other materials provided with the distribution.
 18 * 3. Neither the name of the University nor the names of its contributors
 19 *    may be used to endorse or promote products derived from this software
 20 *    without specific prior written permission.
 21 *
 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 32 * SUCH DAMAGE.
 33 *
 34 *	from: @(#)param.h	5.8 (Berkeley) 6/28/91
 35 */
 36
 37#ifndef _I386_INCLUDE_PARAM_H_
 38#define	_I386_INCLUDE_PARAM_H_
 39
 40#include <machine/_align.h>
 41
 42/*
 43 * Machine dependent constants for Intel 386.
 44 */
 45
 46#define __HAVE_ACPI
 47#define	__HAVE_PIR
 48#define __PCI_REROUTE_INTERRUPT
 49
 50#ifndef MACHINE
 51#define MACHINE		"i386"
 52#endif
 53#ifndef MACHINE_ARCH
 54#define	MACHINE_ARCH	"i386"
 55#endif
 56#define MID_MACHINE	MID_I386
 57
 58#ifdef SMP
 59#ifndef MAXCPU
 60#define MAXCPU		32
 61#endif
 62#else
 63#define MAXCPU		1
 64#endif
 65
 66#ifndef MAXMEMDOM
 67#define	MAXMEMDOM	1
 68#endif
 69
 70#define ALIGNBYTES	_ALIGNBYTES
 71#define ALIGN(p)	_ALIGN(p)
 72/*
 73 * ALIGNED_POINTER is a boolean macro that checks whether an address
 74 * is valid to fetch data elements of type t from on this architecture.
 75 * This does not reflect the optimal alignment, just the possibility
 76 * (within reasonable limits). 
 77 */
 78#define	ALIGNED_POINTER(p, t)	1
 79
 80/*
 81 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
 82 * architecture.  It should be used with appropriate caution.
 83 */
 84#define	CACHE_LINE_SHIFT	6
 85#define	CACHE_LINE_SIZE		(1 << CACHE_LINE_SHIFT)
 86
 87#define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
 88#define PAGE_SIZE	(1 << PAGE_SHIFT)	/* bytes/page */
 89#define PAGE_MASK	(PAGE_SIZE - 1)
 90#define NPTEPG		(PAGE_SIZE / sizeof(pt_entry_t))
 91
 92/* Size in bytes of the page directory */
 93#define NBPTD		(NPGPTD << PAGE_SHIFT)
 94/* Number of PDEs in page directory, 2048 for PAE, 1024 for non-PAE */
 95#define NPDEPTD		(NBPTD / sizeof(pd_entry_t))
 96/* Number of PDEs in one page of the page directory, 512 vs. 1024 */
 97#define NPDEPG		(PAGE_SIZE / sizeof(pd_entry_t))
 98#define PDRMASK		(NBPDR - 1)
 99#ifndef PDRSHIFT
100#define	PDRSHIFT	i386_pmap_PDRSHIFT
101#endif
102#ifndef NBPDR
103#define NBPDR		(1 << PDRSHIFT)	/* bytes/page dir */
104#endif
105
106#define	MAXPAGESIZES	2	/* maximum number of supported page sizes */
107
108#define IOPAGES	2		/* pages of i/o permission bitmap */
109
110#ifndef KSTACK_PAGES
111#define KSTACK_PAGES 4		/* Includes pcb! */
112#endif
113#define KSTACK_GUARD_PAGES 1	/* pages of kstack guard; 0 disables */
114#if KSTACK_PAGES < 4
115#define	TD0_KSTACK_PAGES 4
116#else
117#define	TD0_KSTACK_PAGES KSTACK_PAGES
118#endif
119
120/*
121 * Ceiling on amount of swblock kva space, can be changed via
122 * the kern.maxswzone /boot/loader.conf variable.
123 *
124 * 276 is sizeof(struct swblock), but we do not always have a definition
125 * in scope for struct swblock, so we have to hardcode it.  Each struct
126 * swblock holds metadata for 32 pages, so in theory, this is enough for
127 * 16 GB of swap.  In practice, however, the usable amount is considerably
128 * lower due to fragmentation.
129 */
130#ifndef VM_SWZONE_SIZE_MAX
131#define VM_SWZONE_SIZE_MAX	(276 * 128 * 1024)
132#endif
133
134/*
135 * Ceiling on size of buffer cache (really only effects write queueing,
136 * the VM page cache is not effected), can be changed via
137 * the kern.maxbcache /boot/loader.conf variable.
138 *
139 * The value is equal to the size of the auto-tuned buffer map for
140 * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc().
141 */
142#ifndef VM_BCACHE_SIZE_MAX
143#define VM_BCACHE_SIZE_MAX	(7224 * 16 * 1024)
144#endif
145
146/*
147 * Mach derived conversion macros
148 */
149#define trunc_page(x)		((x) & ~PAGE_MASK)
150#define round_page(x)		(((x) + PAGE_MASK) & ~PAGE_MASK)
151#define trunc_4mpage(x)		((x) & ~PDRMASK)
152#define round_4mpage(x)		((((x)) + PDRMASK) & ~PDRMASK)
153
154#define atop(x)			((x) >> PAGE_SHIFT)
155#define ptoa(x)			((x) << PAGE_SHIFT)
156
157#define i386_btop(x)		((x) >> PAGE_SHIFT)
158#define i386_ptob(x)		((x) << PAGE_SHIFT)
159
160#define	pgtok(x)		((x) * (PAGE_SIZE / 1024))
161
162#define INKERNEL(va)		(TRUE)
163
164#endif /* !_I386_INCLUDE_PARAM_H_ */