1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)param.h 5.3 (Berkeley) 01/18/91 11 */ 12 13 /* 14 * Machine dependent constants for Intel 386. 15 */ 16 17 #define MACHINE "i386" 18 19 #define NBPG 4096 /* bytes/page */ 20 #define PGOFSET (NBPG-1) /* byte offset into page */ 21 #define PGSHIFT 12 /* LOG2(NBPG) */ 22 #define NPTEPG (NBPG/(sizeof (struct pte))) 23 24 #define NBPDR (1024*NBPG) /* bytes/page dir */ 25 #define PDROFSET (NBPDR-1) /* byte offset into page dir */ 26 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 27 28 #define KERNBASE 0xFE000000 /* start of kernel virtual */ 29 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 30 31 #define DEV_BSIZE 512 32 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 33 #define BLKDEV_IOSIZE 2048 34 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 35 36 #define CLSIZE 1 37 #define CLSIZELOG2 0 38 39 #define SSIZE 1 /* initial stack size/NBPG */ 40 #define SINCR 1 /* increment of stack/NBPG */ 41 42 #define UPAGES 2 /* pages of u-area */ 43 44 /* 45 * Constants related to network buffer management. 46 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 47 * on machines that exchange pages of input or output buffers with mbuf 48 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 49 * of the hardware page size. 50 */ 51 #define MSIZE 128 /* size of an mbuf */ 52 #define MCLBYTES 1024 53 #define MCLSHIFT 10 54 #define MCLOFSET (MCLBYTES - 1) 55 #ifndef NMBCLUSTERS 56 #ifdef GATEWAY 57 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 58 #else 59 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 60 #endif 61 #endif 62 63 /* 64 * Size of kernel malloc arena in CLBYTES-sized logical pages 65 */ 66 #ifndef NKMEMCLUSTERS 67 #define NKMEMCLUSTERS (512*1024/CLBYTES) 68 #endif 69 /* 70 * Some macros for units conversion 71 */ 72 /* Core clicks (4096 bytes) to segments and vice versa */ 73 #define ctos(x) (x) 74 #define stoc(x) (x) 75 76 /* Core clicks (4096 bytes) to disk blocks */ 77 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 78 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 79 #define dtob(x) ((x)<<DEV_BSHIFT) 80 81 /* clicks to bytes */ 82 #define ctob(x) ((x)<<PGSHIFT) 83 84 /* bytes to clicks */ 85 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 86 87 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 88 ((unsigned)(bytes) >> DEV_BSHIFT) 89 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 90 ((unsigned)(db) << DEV_BSHIFT) 91 92 /* 93 * Map a ``block device block'' to a file system block. 94 * This should be device dependent, and will be if we 95 * add an entry to cdevsw/bdevsw for that purpose. 96 * For now though just use DEV_BSIZE. 97 */ 98 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 99 100 #ifdef KERNEL 101 #ifndef LOCORE 102 int cpuspeed; 103 #endif 104 #define DELAY(n) { register int N = cpuspeed * (n); while (--N > 0); } 105 106 #else KERNEL 107 #define DELAY(n) { register int N = (n); while (--N > 0); } 108 #endif KERNEL 109