param.h revision 203
14Srgrimes/*- 24Srgrimes * Copyright (c) 1990 The Regents of the University of California. 34Srgrimes * All rights reserved. 44Srgrimes * 54Srgrimes * This code is derived from software contributed to Berkeley by 64Srgrimes * William Jolitz. 74Srgrimes * 84Srgrimes * Redistribution and use in source and binary forms, with or without 94Srgrimes * modification, are permitted provided that the following conditions 104Srgrimes * are met: 114Srgrimes * 1. Redistributions of source code must retain the above copyright 124Srgrimes * notice, this list of conditions and the following disclaimer. 134Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 144Srgrimes * notice, this list of conditions and the following disclaimer in the 154Srgrimes * documentation and/or other materials provided with the distribution. 164Srgrimes * 3. All advertising materials mentioning features or use of this software 174Srgrimes * must display the following acknowledgement: 184Srgrimes * This product includes software developed by the University of 194Srgrimes * California, Berkeley and its contributors. 204Srgrimes * 4. Neither the name of the University nor the names of its contributors 214Srgrimes * may be used to endorse or promote products derived from this software 224Srgrimes * without specific prior written permission. 234Srgrimes * 244Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 254Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 264Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 274Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 284Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 294Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 304Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 314Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 324Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 334Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 344Srgrimes * SUCH DAMAGE. 354Srgrimes * 364Srgrimes * @(#)param.h 5.8 (Berkeley) 6/28/91 374Srgrimes * 384Srgrimes * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE 394Srgrimes * -------------------- ----- ---------------------- 404Srgrimes * CURRENT PATCH LEVEL: 2 00166 414Srgrimes * -------------------- ----- ---------------------- 424Srgrimes * 434Srgrimes * 08 Apr 93 Andrew Herbert Fixes for kmem_alloc panics 444Srgrimes * Rodney W. Grimes Tuneable mbuf sizes 454Srgrimes * 04 Jun 93 Rodney W. Grimes Change default mbuf size to 2048 via 464Srgrimes * MCLSHIFT. 474Srgrimes */ 484Srgrimes 494Srgrimes/* 504Srgrimes * Machine dependent constants for Intel 386. 514Srgrimes */ 524Srgrimes 534Srgrimes#define MACHINE "i386" 544Srgrimes 554Srgrimes/* 564Srgrimes * Round p (pointer or byte index) up to a correctly-aligned value 574Srgrimes * for all data types (int, long, ...). The result is u_int and 584Srgrimes * must be cast to any desired pointer type. 594Srgrimes */ 60203Snate#define ALIGNBYTES (sizeof(int) - 1) 61203Snate#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 624Srgrimes 63203Snate 644Srgrimes#define NBPG 4096 /* bytes/page */ 654Srgrimes#define PGOFSET (NBPG-1) /* byte offset into page */ 664Srgrimes#define PGSHIFT 12 /* LOG2(NBPG) */ 674Srgrimes#define NPTEPG (NBPG/(sizeof (struct pte))) 684Srgrimes 694Srgrimes#define NBPDR (1024*NBPG) /* bytes/page dir */ 704Srgrimes#define PDROFSET (NBPDR-1) /* byte offset into page dir */ 714Srgrimes#define PDRSHIFT 22 /* LOG2(NBPDR) */ 724Srgrimes 734Srgrimes#define KERNBASE 0xFE000000 /* start of kernel virtual */ 744Srgrimes#define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 754Srgrimes 764Srgrimes#define DEV_BSIZE 512 774Srgrimes#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 784Srgrimes#define BLKDEV_IOSIZE 2048 794Srgrimes#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 804Srgrimes 814Srgrimes#define CLSIZE 1 824Srgrimes#define CLSIZELOG2 0 834Srgrimes 844Srgrimes/* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 854Srgrimes#define SSIZE 1 /* initial stack size/NBPG */ 864Srgrimes#define SINCR 1 /* increment of stack/NBPG */ 874Srgrimes 884Srgrimes#define UPAGES 2 /* pages of u-area */ 894Srgrimes 904Srgrimes/* 914Srgrimes * Constants related to network buffer management. 924Srgrimes * MCLBYTES must be no larger than CLBYTES (the software page size), and, 934Srgrimes * on machines that exchange pages of input or output buffers with mbuf 944Srgrimes * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 954Srgrimes * of the hardware page size. 964Srgrimes */ 974Srgrimes#ifndef MSIZE 984Srgrimes#define MSIZE 128 /* size of an mbuf */ 994Srgrimes#endif /* MSIZE */ 1004Srgrimes 1014Srgrimes#ifndef MCLSHIFT 1024Srgrimes#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 1034Srgrimes#endif /* MCLSHIFT */ 1044Srgrimes#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 1054Srgrimes#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 1064Srgrimes 1074Srgrimes#ifndef NMBCLUSTERS 1084Srgrimes#ifdef GATEWAY 1094Srgrimes#define NMBCLUSTERS 512 /* map size, max cluster allocation */ 1104Srgrimes#else 1114Srgrimes#define NMBCLUSTERS 256 /* map size, max cluster allocation */ 1124Srgrimes#endif /* GATEWAY */ 1134Srgrimes#endif /* NMBCLUSTERS */ 1144Srgrimes 1154Srgrimes/* 1164Srgrimes * Size of kernel malloc arena in CLBYTES-sized logical pages 1174Srgrimes */ 1184Srgrimes#ifndef NKMEMCLUSTERS 1194Srgrimes#define NKMEMCLUSTERS (3072*1024/CLBYTES) 1204Srgrimes#endif 1214Srgrimes/* 1224Srgrimes * Some macros for units conversion 1234Srgrimes */ 1244Srgrimes/* Core clicks (4096 bytes) to segments and vice versa */ 1254Srgrimes#define ctos(x) (x) 1264Srgrimes#define stoc(x) (x) 1274Srgrimes 1284Srgrimes/* Core clicks (4096 bytes) to disk blocks */ 1294Srgrimes#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 1304Srgrimes#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 1314Srgrimes#define dtob(x) ((x)<<DEV_BSHIFT) 1324Srgrimes 1334Srgrimes/* clicks to bytes */ 1344Srgrimes#define ctob(x) ((x)<<PGSHIFT) 1354Srgrimes 1364Srgrimes/* bytes to clicks */ 1374Srgrimes#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 1384Srgrimes 1394Srgrimes#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 1404Srgrimes ((unsigned)(bytes) >> DEV_BSHIFT) 1414Srgrimes#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 1424Srgrimes ((unsigned)(db) << DEV_BSHIFT) 1434Srgrimes 1444Srgrimes/* 1454Srgrimes * Map a ``block device block'' to a file system block. 1464Srgrimes * This should be device dependent, and will be if we 1474Srgrimes * add an entry to cdevsw/bdevsw for that purpose. 1484Srgrimes * For now though just use DEV_BSIZE. 1494Srgrimes */ 1504Srgrimes#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 1514Srgrimes 1524Srgrimes/* 1534Srgrimes * Mach derived conversion macros 1544Srgrimes */ 1554Srgrimes#define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) 1564Srgrimes#define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) 1574Srgrimes#define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) 1584Srgrimes#define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) 1594Srgrimes#define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) 1604Srgrimes#define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) 1614Srgrimes#define i386_btop(x) ((unsigned)(x) >> PGSHIFT) 1624Srgrimes#define i386_ptob(x) ((unsigned)(x) << PGSHIFT) 1634Srgrimes 1644Srgrimes#ifndef KERNEL 1654Srgrimes#define DELAY(n) { volatile int N = (n); while (--N > 0); } 1664Srgrimes#endif 167