1 /*- 2 * Copyright (c) 1982, 1986, 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Computer Consoles Inc. 7 * 8 * %sccs.include.proprietary.c% 9 * 10 * @(#)param.h 7.11 (Berkeley) 05/26/92 11 */ 12 13 /* 14 * Machine dependent constants for TAHOE. 15 */ 16 #define MACHINE "tahoe" 17 18 /* 19 * Round p (pointer or byte index) up to a correctly-aligned value for all 20 * data types (int, long, ...). The result is u_int and must be cast to 21 * any desired pointer type. 22 */ 23 #define ALIGNBYTES 3 24 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 25 26 #define NBPG 1024 /* bytes/page */ 27 #define PGOFSET (NBPG-1) /* byte offset into page */ 28 #define PGSHIFT 10 /* LOG2(NBPG) */ 29 #define NPTEPG (NBPG/(sizeof (struct pte))) 30 31 #define KERNBASE 0xc0000000 /* start of kernel virtual */ 32 #define KERNTEXTOFF (KERNBASE + 0x800) /* start of kernel text */ 33 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 34 35 #define DEV_BSIZE 1024 36 #define DEV_BSHIFT 10 /* log2(DEV_BSIZE) */ 37 #define BLKDEV_IOSIZE 1024 /* NBPG for physical controllers */ 38 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 39 40 #define CLSIZE 1 41 #define CLSIZELOG2 0 42 43 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ 44 #define SSIZE 2 /* initial stack size/NBPG */ 45 #define SINCR 2 /* increment of stack/NBPG */ 46 #define UPAGES 8 /* pages of u-area (2 stack pages) */ 47 48 /* 49 * Constants related to network buffer management. 50 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 51 * on machines that exchange pages of input or output buffers with mbuf 52 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 53 * of the hardware page size. 54 */ 55 #define MSIZE 128 /* size of an mbuf */ 56 #define MAPPED_MBUFS /* can do scatter-gather I/O */ 57 #if CLBYTES > 1024 58 #define MCLBYTES 1024 59 #define MCLSHIFT 10 60 #define MCLOFSET (MCLBYTES - 1) 61 #else 62 #define MCLBYTES CLBYTES 63 #define MCLSHIFT CLSHIFT 64 #define MCLOFSET CLOFSET 65 #endif 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 72 #define MAXCKEY 255 /* maximal allowed code key */ 73 #define MAXDKEY 255 /* maximal allowed data key */ 74 #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 75 #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 76 77 /* 78 * Size of kernel malloc arena in CLBYTES-sized logical pages 79 */ 80 #ifndef NKMEMCLUSTERS 81 #define NKMEMCLUSTERS (512*1024/CLBYTES) 82 #endif 83 84 /* 85 * Some macros for units conversion 86 */ 87 /* Core clicks (1024 bytes) to segments and vice versa */ 88 #define ctos(x) (x) 89 #define stoc(x) (x) 90 91 /* Core clicks (1024 bytes) to disk blocks */ 92 #define ctod(x) (x) 93 #define dtoc(x) (x) 94 #define dtob(x) ((x)<<PGSHIFT) 95 96 /* clicks to bytes */ 97 #define ctob(x) ((x)<<PGSHIFT) 98 99 /* bytes to clicks */ 100 #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 101 102 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 103 ((unsigned)(bytes) >> DEV_BSHIFT) 104 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 105 ((unsigned)(db) << DEV_BSHIFT) 106 107 /* 108 * Map a ``block device block'' to a file system block. 109 * This should be device dependent, and will be if we 110 * add an entry to cdevsw/bdevsw for that purpose. 111 * For now though just use DEV_BSIZE. 112 */ 113 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 114 115 /* 116 * Macros to decode processor status word. 117 */ 118 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 119 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 120 121 #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 122