1 /* $NetBSD: param.h,v 1.62 2019/01/07 22:00:33 jdolecek Exp $ */ 2 /*- 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)param.h 5.8 (Berkeley) 6/28/91 34 */ 35 36 #ifndef _VAX_PARAM_H_ 37 #define _VAX_PARAM_H_ 38 39 /* 40 * Machine dependent constants for VAX. 41 */ 42 43 #define _MACHINE vax 44 #define MACHINE "vax" 45 #define _MACHINE_ARCH vax 46 #define MACHINE_ARCH "vax" 47 #define MID_MACHINE MID_VAX 48 49 #define PGSHIFT 12 /* LOG2(NBPG) */ 50 #define NBPG (1 << PGSHIFT) /* (1 << PGSHIFT) bytes/page */ 51 #define PGOFSET (NBPG - 1) /* byte offset into page */ 52 53 #define VAX_PGSHIFT 9 54 #define VAX_NBPG (1 << VAX_PGSHIFT) 55 #define VAX_PGOFSET (VAX_NBPG - 1) 56 #define VAX_NPTEPG (VAX_NBPG / 4) 57 58 #define KERNBASE 0x80000000 /* start of kernel virtual */ 59 60 #define UPAGES 2 /* pages of u-area */ 61 #define USPACE (NBPG*UPAGES) 62 #define REDZONEADDR (VAX_NBPG*3) /* Must be > sizeof(struct pcb) */ 63 64 #ifndef MSGBUFSIZE 65 #define MSGBUFSIZE NBPG /* default message buffer size */ 66 #endif 67 68 /* 69 * KVA is very tight on vax, reduce the amount of KVA used by pipe 70 * "direct" write code to reasonably low value. 71 */ 72 #ifndef PIPE_DIRECT_CHUNK 73 #define PIPE_DIRECT_CHUNK 65536 74 #endif 75 76 /* 77 * Constants related to network buffer management. 78 * MCLBYTES must be no larger than NBPG (the software page size), and, 79 * on machines that exchange pages of input or output buffers with mbuf 80 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 81 * of the hardware page size. 82 */ 83 #define MSIZE 256 /* size of an mbuf */ 84 85 #ifndef MCLSHIFT 86 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 87 /* 2K cluster can hold Ether frame */ 88 #endif /* MCLSHIFT */ 89 90 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 91 92 /* 93 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 94 * logical pages. 95 */ 96 #define NKMEMPAGES_MIN_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT) 97 #define NKMEMPAGES_MAX_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT) 98 99 /* 100 * Some macros for units conversion 101 */ 102 103 #define btop(x) ((x) >> PGSHIFT) 104 105 /* MD conversion macros */ 106 #define vax_btoc(x) (((unsigned)(x) + VAX_PGOFSET) >> VAX_PGSHIFT) 107 #define vax_btop(x) (((unsigned)(x)) >> VAX_PGSHIFT) 108 109 #ifdef _KERNEL 110 #include <machine/intr.h> 111 112 /* Prototype needed for delay() */ 113 #ifndef _LOCORE 114 void delay(int); 115 /* inline macros used inside kernel */ 116 #include <machine/macros.h> 117 #endif 118 119 #define DELAY(x) delay(x) 120 #define MAXEXEC 1 121 #endif /* _KERNEL */ 122 123 #endif /* _VAX_PARAM_H_ */ 124