1 /* param.h 1.10 87/10/28 */ 2 3 #ifndef ENDIAN 4 /* 5 * Machine dependent constants for TAHOE. 6 */ 7 #define MACHINE "tahoe" 8 9 #define CHAR_BIT NBBY 10 #define CHAR_MAX 0x7f 11 #define CHAR_MIN 0x80 12 #define CLK_TCK UNDEFINED_FOR_NOW 13 #define INT_MAX 0x7fffffff 14 #define INT_MIN 0x80000000 15 #define LONG_MAX 0x7fffffff 16 #define LONG_MIN 0x80000000 17 #define SCHAR_MAX 0x7f 18 #define SCHAR_MIN 0x80 19 #define SHRT_MAX 0x7fff 20 #define SHRT_MIN 0x8000 21 #define UCHAR_MAX 0xff 22 #define UINT_MAX 0xffffffff 23 #define ULONG_MAX 0xffffffff 24 #define USHRT_MAX 0xffff 25 26 /* 27 * Definitions for byte order, 28 * according to byte significance from low address to high. 29 */ 30 #define LITTLE 1234 /* least-significant byte first (vax) */ 31 #define BIG 4321 /* most-significant byte first */ 32 #define PDP 3412 /* LSB first in word, MSW first in long (pdp) */ 33 #define ENDIAN BIG /* byte order on tahoe */ 34 35 /* 36 * Macros for network/external number representation conversion. 37 */ 38 #if ENDIAN == BIG && !defined(lint) 39 #define ntohl(x) (x) 40 #define ntohs(x) (x) 41 #define htonl(x) (x) 42 #define htons(x) (x) 43 #else 44 unsigned short ntohs(), htons(); 45 unsigned long ntohl(), htonl(); 46 #endif 47 48 #define NBPG 1024 /* bytes/page */ 49 #define PGOFSET (NBPG-1) /* byte offset into page */ 50 #define PGSHIFT 10 /* LOG2(NBPG) */ 51 #define NPTEPG (NBPG/(sizeof (struct pte))) 52 53 #define KERNBASE 0xc0000000 /* start of kernel virtual */ 54 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 55 56 #define DEV_BSIZE 1024 57 #define DEV_BSHIFT 10 /* log2(DEV_BSIZE) */ 58 #define BLKDEV_IOSIZE 1024 /* NBPG for physical controllers */ 59 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 60 61 #define CLSIZE 1 62 #define CLSIZELOG2 0 63 64 #define SSIZE 2 /* initial stack size/NBPG */ 65 #define SINCR 2 /* increment of stack/NBPG */ 66 #define UPAGES 6 /* pages of u-area (2 stack pages) */ 67 68 #define MAXCKEY 255 /* maximal allowed code key */ 69 #define MAXDKEY 255 /* maximal allowed data key */ 70 #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 71 #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 72 73 /* 74 * Some macros for units conversion 75 */ 76 /* Core clicks (1024 bytes) to segments and vice versa */ 77 #define ctos(x) (x) 78 #define stoc(x) (x) 79 80 /* Core clicks (1024 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)<<PGSHIFT) 87 88 /* bytes to clicks */ 89 #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 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 #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 111 #endif 112