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 7.15 (Berkeley) 04/03/90 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 /* 21 * Round p (pointer or byte index) up to a correctly-aligned value 22 * for all data types (int, long, ...). The result is u_int and 23 * must be cast to any desired pointer type. 24 */ 25 #define ALIGN(p) (((u_int)(p) + (sizeof(int) - 1)) &~ (sizeof(int) - 1)) 26 27 #define NBPG 512 /* bytes/page */ 28 #define PGOFSET (NBPG-1) /* byte offset into page */ 29 #define PGSHIFT 9 /* LOG2(NBPG) */ 30 #define NPTEPG (NBPG/(sizeof (struct pte))) 31 32 #define KERNBASE 0x80000000 /* start of kernel virtual */ 33 #define KERNTEXTOFF KERNBASE /* start of kernel text */ 34 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 35 36 #define DEV_BSIZE 512 37 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 38 #define BLKDEV_IOSIZE 2048 39 #define MAXPHYS (63 * 1024) /* max raw I/O transfer size */ 40 41 #define CLSIZE 2 42 #define CLSIZELOG2 1 43 44 #define SSIZE 4 /* initial stack size/NBPG */ 45 #define SINCR 4 /* increment of stack/NBPG */ 46 47 #define UPAGES 16 /* pages of u-area */ 48 49 /* 50 * Constants related to network buffer management. 51 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 52 * on machines that exchange pages of input or output buffers with mbuf 53 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 54 * of the hardware page size. 55 */ 56 #define MSIZE 128 /* size of an mbuf */ 57 #define MAPPED_MBUFS /* can do scatter-gather I/O */ 58 #if CLBYTES > 1024 59 #define MCLBYTES 1024 60 #define MCLSHIFT 10 61 #define MCLOFSET (MCLBYTES - 1) 62 #else 63 #define MCLBYTES CLBYTES 64 #define MCLSHIFT CLSHIFT 65 #define MCLOFSET CLOFSET 66 #endif 67 #ifdef GATEWAY 68 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 69 #else 70 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 71 #endif 72 73 /* 74 * Some macros for units conversion 75 */ 76 /* Core clicks (512 bytes) to segments and vice versa */ 77 #define ctos(x) (x) 78 #define stoc(x) (x) 79 80 /* Core clicks (512 bytes) to disk blocks */ 81 #define ctod(x) (x) 82 #define dtoc(x) (x) 83 #define dtob(x) ((x)<<PGSHIFT) 84 85 /* clicks to bytes */ 86 #define ctob(x) ((x)<<9) 87 88 /* bytes to clicks */ 89 #define btoc(x) ((((unsigned)(x)+511)>>9)) 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 will be if we 99 * add an entry to cdevsw/bdevsw for that purpose. 100 * For now though just use DEV_BSIZE. 101 */ 102 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 103 104 /* 105 * Macros to decode processor status word. 106 */ 107 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 108 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 109 110 #ifdef KERNEL 111 #ifndef LOCORE 112 int cpuspeed; 113 #define DELAY(n) { register int N = cpuspeed * (n); while (--N > 0); } 114 #endif 115 116 #else KERNEL 117 #define DELAY(n) { register int N = (n); while (--N > 0); } 118 #endif KERNEL 119