1 /* 2 * Copyright (c) 1992 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * %sccs.include.redist.c% 10 * 11 * @(#)param.h 7.1 (Berkeley) 07/13/92 12 * 13 * from: $Header: param.h,v 1.11 92/06/24 08:52:05 torek Exp $ (LBL) 14 */ 15 16 /* 17 * Machine dependent constants for Sun-4c (SPARCstation) 18 */ 19 #define MACHINE "sparc" 20 21 #ifdef KERNEL /* XXX */ 22 #include "machine/cpu.h" /* XXX */ 23 #endif /* XXX */ 24 25 /* 26 * Round p (pointer or byte index) up to a correctly-aligned value for 27 * the machine's strictest data type. The result is u_int and must be 28 * cast to any desired pointer type. 29 */ 30 #define ALIGNBYTES 7 31 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES) 32 33 #define NBPG 4096 /* bytes/page */ 34 #define PGOFSET (NBPG-1) /* byte offset into page */ 35 #define PGSHIFT 12 /* log2(NBPG) */ 36 37 #define KERNBASE 0xf8000000 /* start of kernel virtual space */ 38 #define KERNTEXTOFF 0xf8004000 /* start of kernel text */ 39 #define BTOPKERNBASE ((u_long)KERNBASE >> PG_SHIFT) 40 41 #define DEV_BSIZE 512 42 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 43 #define BLKDEV_IOSIZE 2048 44 #define MAXPHYS (64 * 1024) 45 46 #define CLSIZE 1 47 #define CLSIZELOG2 0 48 49 /* NOTE: SSIZE and UPAGES must be multiples of CLSIZE */ 50 #define SSIZE 1 /* initial stack size/NBPG */ 51 #define UPAGES 2 /* pages of u-area */ 52 53 /* 54 * Constants related to network buffer management. 55 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 56 * on machines that exchange pages of input or output buffers with mbuf 57 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 58 * of the hardware page size. 59 */ 60 #define MSIZE 128 /* size of an mbuf */ 61 #define MCLBYTES 2048 /* enough for whole Ethernet packet */ 62 #define MCLSHIFT 11 /* log2(MCLBYTES) */ 63 #define MCLOFSET (MCLBYTES - 1) 64 65 #ifndef NMBCLUSTERS 66 #ifdef GATEWAY 67 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 68 #else 69 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 70 #endif 71 #endif 72 73 /* 74 * Size of kernel malloc arena in CLBYTES-sized logical pages. 75 */ 76 #ifndef NKMEMCLUSTERS 77 #define NKMEMCLUSTERS (3 * 1024 * 1024 / CLBYTES) 78 #endif 79 80 /* pages ("clicks") (4096 bytes) to disk blocks */ 81 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 82 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 83 #define dtob(x) ((x) << DEV_BSHIFT) 84 85 /* pages to bytes */ 86 #define ctob(x) ((x) << PGSHIFT) 87 88 /* bytes to pages */ 89 #define btoc(x) (((unsigned)(x) + PGOFSET) >> PGSHIFT) 90 91 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 92 ((unsigned)(bytes) >> DEV_BSHIFT) 93 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 94 ((unsigned)(db) << DEV_BSHIFT) 95 96 /* 97 * Map a ``block device block'' to a file system block. 98 * This should be device dependent, and should use the bsize 99 * field from the disk label. 100 * For now though just use DEV_BSIZE. 101 */ 102 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 103 104 #ifdef KERNEL 105 #ifndef LOCORE 106 #define DELAY(n) delay(n) 107 #endif 108 #else 109 #define DELAY(n) { register volatile int N = (n); while (--N > 0); } 110 #endif 111