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 7.17 (Berkeley) 12/16/90 7 */ 8 9 /* 10 * Machine dependent constants for VAX. 11 */ 12 #define MACHINE "vax" 13 14 /* 15 * Round p (pointer or byte index) up to a correctly-aligned value 16 * for all data types (int, long, ...). The result is u_int and 17 * must be cast to any desired pointer type. 18 */ 19 #define ALIGN(p) (((u_int)(p) + (sizeof(int) - 1)) &~ (sizeof(int) - 1)) 20 21 #define NBPG 512 /* bytes/page */ 22 #define PGOFSET (NBPG-1) /* byte offset into page */ 23 #define PGSHIFT 9 /* LOG2(NBPG) */ 24 #define NPTEPG (NBPG/(sizeof (struct pte))) 25 26 #define KERNBASE 0x80000000 /* start of kernel virtual */ 27 #define KERNTEXTOFF KERNBASE /* start of kernel text */ 28 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 29 30 #define DEV_BSIZE 512 31 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 32 #define BLKDEV_IOSIZE 2048 33 #define MAXPHYS (63 * 1024) /* max raw I/O transfer size */ 34 35 #define CLSIZE 2 36 #define CLSIZELOG2 1 37 38 #define SSIZE 4 /* initial stack size/NBPG */ 39 #define SINCR 4 /* increment of stack/NBPG */ 40 41 #define UPAGES 16 /* pages of u-area */ 42 43 /* 44 * Constants related to network buffer management. 45 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 46 * on machines that exchange pages of input or output buffers with mbuf 47 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 48 * of the hardware page size. 49 */ 50 #define MSIZE 128 /* size of an mbuf */ 51 #define MAPPED_MBUFS /* can do scatter-gather I/O */ 52 #if CLBYTES > 1024 53 #define MCLBYTES 1024 54 #define MCLSHIFT 10 55 #define MCLOFSET (MCLBYTES - 1) 56 #else 57 #define MCLBYTES CLBYTES 58 #define MCLSHIFT CLSHIFT 59 #define MCLOFSET CLOFSET 60 #endif 61 #ifdef GATEWAY 62 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 63 #else 64 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 65 #endif 66 67 /* 68 * Size of kernel malloc arena in CLBYTES-sized logical pages 69 */ 70 #ifndef NKMEMCLUSTERS 71 #define NKMEMCLUSTERS (512*1024/CLBYTES) 72 #endif 73 74 /* 75 * Some macros for units conversion 76 */ 77 /* Core clicks (512 bytes) to segments and vice versa */ 78 #define ctos(x) (x) 79 #define stoc(x) (x) 80 81 /* Core clicks (512 bytes) to disk blocks */ 82 #define ctod(x) (x) 83 #define dtoc(x) (x) 84 #define dtob(x) ((x)<<PGSHIFT) 85 86 /* clicks to bytes */ 87 #define ctob(x) ((x)<<9) 88 89 /* bytes to clicks */ 90 #define btoc(x) ((((unsigned)(x)+511)>>9)) 91 92 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 93 ((unsigned)(bytes) >> DEV_BSHIFT) 94 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 95 ((unsigned)(db) << DEV_BSHIFT) 96 97 /* 98 * Map a ``block device block'' to a file system block. 99 * This should be device dependent, and will be if we 100 * add an entry to cdevsw/bdevsw for that purpose. 101 * For now though just use DEV_BSIZE. 102 */ 103 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 104 105 /* 106 * Macros to decode processor status word. 107 */ 108 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 109 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 110 111 #ifdef KERNEL 112 #ifndef LOCORE 113 int cpuspeed; 114 #define DELAY(n) { register int N = cpuspeed * (n); while (--N > 0); } 115 #endif 116 117 #else KERNEL 118 #define DELAY(n) { register int N = (n); while (--N > 0); } 119 #endif KERNEL 120