1 /* $NetBSD: param.h,v 1.25 1995/03/28 18:16:58 jtc Exp $ */ 2 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)param.h 5.8 (Berkeley) 6/28/91 39 */ 40 41 /* 42 * Machine dependent constants for Intel 386. 43 */ 44 45 #ifdef _KERNEL 46 #ifdef LOCORE 47 #include <machine/psl.h> 48 #else 49 #include <machine/cpu.h> 50 #endif 51 #endif 52 53 #define MACHINE "i386" 54 #define MACHINE_ARCH "i386" 55 #define MID_MACHINE MID_I386 56 57 /* 58 * Round p (pointer or byte index) up to a correctly-aligned value 59 * for all data types (int, long, ...). The result is u_int and 60 * must be cast to any desired pointer type. 61 */ 62 #define ALIGNBYTES (sizeof(int) - 1) 63 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 64 65 #define PGSHIFT 12 /* LOG2(NBPG) */ 66 #define NBPG (1 << PGSHIFT) /* bytes/page */ 67 #define PGOFSET (NBPG-1) /* byte offset into page */ 68 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 69 70 #define KERNBASE 0xf8000000 /* start of kernel virtual space */ 71 #define KERNSIZE 0x01800000 /* size of kernel virtual space */ 72 #define KERNTEXTOFF 0xf8100000 /* start of kernel text */ 73 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 74 75 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 76 #define DEV_BSIZE (1 << DEV_BSHIFT) 77 #define BLKDEV_IOSIZE 2048 78 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 79 80 #define CLSIZELOG2 0 81 #define CLSIZE (1 << CLSIZELOG2) 82 83 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 84 #define SSIZE 1 /* initial stack size/NBPG */ 85 #define SINCR 1 /* increment of stack/NBPG */ 86 #define UPAGES 2 /* pages of u-area */ 87 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 88 89 /* 90 * Constants related to network buffer management. 91 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 92 * on machines that exchange pages of input or output buffers with mbuf 93 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 94 * of the hardware page size. 95 */ 96 #define MSIZE 128 /* size of an mbuf */ 97 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 98 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 99 #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ 100 101 #ifndef NMBCLUSTERS 102 #ifdef GATEWAY 103 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 104 #else 105 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 106 #endif 107 #endif 108 109 /* 110 * Size of kernel malloc arena in CLBYTES-sized logical pages 111 */ 112 #ifndef NKMEMCLUSTERS 113 #define NKMEMCLUSTERS (6 * 1024 * 1024 / CLBYTES) 114 #endif 115 116 /* pages ("clicks") (4096 bytes) to disk blocks */ 117 #define ctod(x) ((unsigned)(x) << (PGSHIFT - DEV_BSHIFT)) 118 #define dtoc(x) ((unsigned)(x) >> (PGSHIFT - DEV_BSHIFT)) 119 120 /* bytes to pages */ 121 #define ctob(x) ((unsigned)(x) << PGSHIFT) 122 #define btoc(x) (((unsigned)(x) + PGOFSET) >> PGSHIFT) 123 124 /* bytes to disk blocks */ 125 #define dbtob(x) ((x) << DEV_BSHIFT) 126 #define btodb(x) ((x) >> DEV_BSHIFT) 127 128 /* 129 * Map a ``block device block'' to a file system block. 130 * This should be device dependent, and should use the bsize 131 * field from the disk label. 132 * For now though just use DEV_BSIZE. 133 */ 134 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 135 136 /* 137 * Mach derived conversion macros 138 */ 139 #define i386_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 140 #define i386_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 141 #define i386_btod(x) ((unsigned)(x) >> PDSHIFT) 142 #define i386_dtob(x) ((unsigned)(x) << PDSHIFT) 143 #define i386_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 144 #define i386_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 145 #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 146 #define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 147