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 1.12 (Berkeley) 01/21/88 7 */ 8 9 /* 10 * Machine dependent constants for TAHOE. 11 */ 12 #define MACHINE "tahoe" 13 14 #ifndef BYTE_ORDER 15 #include <machine/endian.h> 16 #endif 17 18 #define CHAR_BIT NBBY 19 #define CHAR_MAX 0x7f 20 #define CHAR_MIN 0x80 21 #define CLK_TCK 60 /* for times() */ 22 #define INT_MAX 0x7fffffff 23 #define INT_MIN 0x80000000 24 #define LONG_MAX 0x7fffffff 25 #define LONG_MIN 0x80000000 26 #define SCHAR_MAX 0x7f 27 #define SCHAR_MIN 0x80 28 #define SHRT_MAX 0x7fff 29 #define SHRT_MIN 0x8000 30 #define UCHAR_MAX 0xff 31 #define UINT_MAX 0xffffffff 32 #define ULONG_MAX 0xffffffff 33 #define USHRT_MAX 0xffff 34 35 #define NBPG 1024 /* bytes/page */ 36 #define PGOFSET (NBPG-1) /* byte offset into page */ 37 #define PGSHIFT 10 /* LOG2(NBPG) */ 38 #define NPTEPG (NBPG/(sizeof (struct pte))) 39 40 #define KERNBASE 0xc0000000 /* start of kernel virtual */ 41 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 42 43 #define DEV_BSIZE 1024 44 #define DEV_BSHIFT 10 /* log2(DEV_BSIZE) */ 45 #define BLKDEV_IOSIZE 1024 /* NBPG for physical controllers */ 46 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 47 48 #define CLSIZE 1 49 #define CLSIZELOG2 0 50 51 #define SSIZE 2 /* initial stack size/NBPG */ 52 #define SINCR 2 /* increment of stack/NBPG */ 53 #define UPAGES 6 /* pages of u-area (2 stack pages) */ 54 55 #define MAXCKEY 255 /* maximal allowed code key */ 56 #define MAXDKEY 255 /* maximal allowed data key */ 57 #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 58 #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 59 60 /* 61 * Some macros for units conversion 62 */ 63 /* Core clicks (1024 bytes) to segments and vice versa */ 64 #define ctos(x) (x) 65 #define stoc(x) (x) 66 67 /* Core clicks (1024 bytes) to disk blocks */ 68 #define ctod(x) (x) 69 #define dtoc(x) (x) 70 #define dtob(x) ((x)<<PGSHIFT) 71 72 /* clicks to bytes */ 73 #define ctob(x) ((x)<<PGSHIFT) 74 75 /* bytes to clicks */ 76 #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 77 78 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 79 ((unsigned)(bytes) >> DEV_BSHIFT) 80 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 81 ((unsigned)(db) << DEV_BSHIFT) 82 83 /* 84 * Map a ``block device block'' to a file system block. 85 * This should be device dependent, and will be if we 86 * add an entry to cdevsw/bdevsw for that purpose. 87 * For now though just use DEV_BSIZE. 88 */ 89 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 90 91 /* 92 * Macros to decode processor status word. 93 */ 94 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 95 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 96 97 #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 98