1 /* 2 * Copyright (c) 1982, 1986, 1988 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 7.8 (Berkeley) 04/28/91 7 */ 8 9 /* 10 * Machine dependent constants for TAHOE. 11 */ 12 #define MACHINE "tahoe" 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 1024 /* bytes/page */ 22 #define PGOFSET (NBPG-1) /* byte offset into page */ 23 #define PGSHIFT 10 /* LOG2(NBPG) */ 24 #define NPTEPG (NBPG/(sizeof (struct pte))) 25 26 #define KERNBASE 0xc0000000 /* start of kernel virtual */ 27 #define KERNTEXTOFF (KERNBASE + 0x800) /* start of kernel text */ 28 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 29 30 #define DEV_BSIZE 1024 31 #define DEV_BSHIFT 10 /* log2(DEV_BSIZE) */ 32 #define BLKDEV_IOSIZE 1024 /* NBPG for physical controllers */ 33 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 34 35 #define CLSIZE 1 36 #define CLSIZELOG2 0 37 38 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 39 #define SSIZE 2 /* initial stack size/NBPG */ 40 #define SINCR 2 /* increment of stack/NBPG */ 41 #define UPAGES 8 /* pages of u-area (2 stack pages) */ 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 #define MAXCKEY 255 /* maximal allowed code key */ 68 #define MAXDKEY 255 /* maximal allowed data key */ 69 #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 70 #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 71 72 /* 73 * Size of kernel malloc arena in CLBYTES-sized logical pages 74 */ 75 #ifndef NKMEMCLUSTERS 76 #define NKMEMCLUSTERS (512*1024/CLBYTES) 77 #endif 78 79 /* 80 * Some macros for units conversion 81 */ 82 /* Core clicks (1024 bytes) to segments and vice versa */ 83 #define ctos(x) (x) 84 #define stoc(x) (x) 85 86 /* Core clicks (1024 bytes) to disk blocks */ 87 #define ctod(x) (x) 88 #define dtoc(x) (x) 89 #define dtob(x) ((x)<<PGSHIFT) 90 91 /* clicks to bytes */ 92 #define ctob(x) ((x)<<PGSHIFT) 93 94 /* bytes to clicks */ 95 #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 96 97 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 98 ((unsigned)(bytes) >> DEV_BSHIFT) 99 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 100 ((unsigned)(db) << DEV_BSHIFT) 101 102 /* 103 * Map a ``block device block'' to a file system block. 104 * This should be device dependent, and will be if we 105 * add an entry to cdevsw/bdevsw for that purpose. 106 * For now though just use DEV_BSIZE. 107 */ 108 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 109 110 /* 111 * Macros to decode processor status word. 112 */ 113 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 114 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 115 116 #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 117