1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)param.h 7.14 (Berkeley) 02/23/90 7 */ 8 9 /* 10 * Machine dependent constants for VAX. 11 */ 12 #define MACHINE "vax" 13 14 #ifndef BYTE_ORDER 15 #include <machine/endian.h> 16 #endif 17 18 #include <machine/machlimits.h> 19 20 #define NBPG 512 /* bytes/page */ 21 #define PGOFSET (NBPG-1) /* byte offset into page */ 22 #define PGSHIFT 9 /* LOG2(NBPG) */ 23 #define NPTEPG (NBPG/(sizeof (struct pte))) 24 25 #define KERNBASE 0x80000000 /* start of kernel virtual */ 26 #define KERNTEXTOFF KERNBASE /* start of kernel text */ 27 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 28 29 #define DEV_BSIZE 512 30 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 31 #define BLKDEV_IOSIZE 2048 32 #define MAXPHYS (63 * 1024) /* max raw I/O transfer size */ 33 34 #define CLSIZE 2 35 #define CLSIZELOG2 1 36 37 #define SSIZE 4 /* initial stack size/NBPG */ 38 #define SINCR 4 /* increment of stack/NBPG */ 39 40 #define UPAGES 16 /* pages of u-area */ 41 42 /* 43 * Constants related to network buffer management. 44 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 45 * on machines that exchange pages of input or output buffers with mbuf 46 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 47 * of the hardware page size. 48 */ 49 #define MSIZE 128 /* size of an mbuf */ 50 #define MAPPED_MBUFS /* can do scatter-gather I/O */ 51 #if CLBYTES > 1024 52 #define MCLBYTES 1024 53 #define MCLSHIFT 10 54 #define MCLOFSET (MCLBYTES - 1) 55 #else 56 #define MCLBYTES CLBYTES 57 #define MCLSHIFT CLSHIFT 58 #define MCLOFSET CLOFSET 59 #endif 60 #ifdef GATEWAY 61 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 62 #else 63 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 64 #endif 65 66 /* 67 * Some macros for units conversion 68 */ 69 /* Core clicks (512 bytes) to segments and vice versa */ 70 #define ctos(x) (x) 71 #define stoc(x) (x) 72 73 /* Core clicks (512 bytes) to disk blocks */ 74 #define ctod(x) (x) 75 #define dtoc(x) (x) 76 #define dtob(x) ((x)<<PGSHIFT) 77 78 /* clicks to bytes */ 79 #define ctob(x) ((x)<<9) 80 81 /* bytes to clicks */ 82 #define btoc(x) ((((unsigned)(x)+511)>>9)) 83 84 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 85 ((unsigned)(bytes) >> DEV_BSHIFT) 86 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 87 ((unsigned)(db) << DEV_BSHIFT) 88 89 /* 90 * Map a ``block device block'' to a file system block. 91 * This should be device dependent, and will be if we 92 * add an entry to cdevsw/bdevsw for that purpose. 93 * For now though just use DEV_BSIZE. 94 */ 95 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 96 97 /* 98 * Macros to decode processor status word. 99 */ 100 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 101 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 102 103 #ifdef KERNEL 104 #ifndef LOCORE 105 int cpuspeed; 106 #define DELAY(n) { register int N = cpuspeed * (n); while (--N > 0); } 107 #endif 108 109 #else KERNEL 110 #define DELAY(n) { register int N = (n); while (--N > 0); } 111 #endif KERNEL 112