1/* $NetBSD: param.h,v 1.50 2021/07/19 10:28:58 christos 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 * 3. 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 *
38 *	@(#)param.h	8.1 (Berkeley) 6/10/93
39 */
40
41#ifdef _KERNEL_OPT
42#include "opt_param.h"
43#endif
44
45/*
46 * Machine dependent constants for the Alpha.
47 */
48#define	_MACHINE	alpha
49#define	MACHINE		"alpha"
50#define	_MACHINE_ARCH	alpha
51#define	MACHINE_ARCH	"alpha"
52#define	MID_MACHINE	MID_ALPHA
53
54#ifdef _KERNEL
55#include <machine/cpu.h>
56#else
57#define ALPHA_PGSHIFT	13
58#endif
59
60/*
61 * Compiler assumes 16 byte stack alignment, per recommendation of
62 * Alpha Architecture Handbook.
63 */
64#define	STACK_ALIGNBYTES	(16 - 1)
65
66#define	NBPG		(1 << ALPHA_PGSHIFT)		/* bytes/page */
67#define	PGOFSET		(NBPG-1)			/* byte off. into pg */
68#define	PGSHIFT		ALPHA_PGSHIFT			/* LOG2(NBPG) */
69
70#define	KERNBASE	0xfffffc0000a00000	/* start of kernel virtual */
71#define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
72
73#define	SSIZE		1		/* initial stack size/NBPG */
74#define	SINCR		1		/* increment of stack/NBPG */
75
76#define	UPAGES		2			/* pages of u-area */
77#define	USPACE		(UPAGES * NBPG)		/* total size of u-area */
78
79#ifndef MSGBUFSIZE
80#define MSGBUFSIZE	NBPG		/* default message buffer size */
81#endif
82
83/*
84 * EV4 (21064) and EV5 (21164) have a 32-byte cache line size.
85 * EV6 (21264) and EV7 (21364) have a 64-byte cache line size.
86 */
87
88/*
89 * Constants related to network buffer management.
90 * MCLBYTES must be no larger than NBPG (the software page size), and,
91 * on machines that exchange pages of input or output buffers with mbuf
92 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
93 * of the hardware page size.
94 */
95#define	MSIZE		256		/* size of an mbuf */
96
97#ifndef MCLSHIFT
98#define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
99					/* 2K cluster can hold Ether frame */
100#endif	/* MCLSHIFT */
101
102#define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
103
104/*
105 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
106 * logical pages.
107 * No enforced maximum on alpha
108 */
109#define	NKMEMPAGES_MIN_DEFAULT	((16 * 1024 * 1024) >> PAGE_SHIFT)
110#define	NKMEMPAGES_MAX_UNLIMITED	1
111
112/*
113 * Mach derived conversion macros
114 */
115#define	alpha_round_page(x)	((((unsigned long)(x)) + NBPG - 1) & ~(NBPG-1))
116#define	alpha_trunc_page(x)	((unsigned long)(x) & ~(NBPG-1))
117#define	alpha_btop(x)		((unsigned long)(x) >> PGSHIFT)
118#define	alpha_ptob(x)		((unsigned long)(x) << PGSHIFT)
119
120#ifdef _KERNEL
121#ifndef _LOCORE
122
123#include <machine/intr.h>
124
125void	delay(unsigned long);
126#define	DELAY(n)	delay(n)
127
128#endif
129#endif /* !_KERNEL */
130