1*30407Skarels /* param.h 1.6 87/01/16 */ 225681Ssam 325681Ssam /* 425681Ssam * Machine dependent constants for TAHOE. 525681Ssam */ 629950Skarels 729950Skarels #ifndef ENDIAN 829950Skarels /* 929950Skarels * Definitions for byte order, 1029950Skarels * according to byte significance from low address to high. 1129950Skarels */ 1229950Skarels #define LITTLE 1234 /* least-significant byte first (vax) */ 1329950Skarels #define BIG 4321 /* most-significant byte first */ 1429950Skarels #define PDP 3412 /* LSB first in word, MSW first in long (pdp) */ 1529950Skarels #define ENDIAN BIG /* byte order on tahoe */ 1629950Skarels 1730402Skarels /* 1830402Skarels * Macros for network/external number representation conversion. 1930402Skarels */ 2030402Skarels #if ENDIAN == BIG && !defined(lint) 2130402Skarels #define ntohl(x) (x) 2230402Skarels #define ntohs(x) (x) 2330402Skarels #define htonl(x) (x) 2430402Skarels #define htons(x) (x) 2530402Skarels #else 2630402Skarels u_short ntohs(), htons(); 2730402Skarels u_long ntohl(), htonl(); 2830402Skarels #endif 2930402Skarels 30*30407Skarels #define NBPG 1024 /* bytes/page */ 31*30407Skarels #define PGOFSET (NBPG-1) /* byte offset into page */ 32*30407Skarels #define PGSHIFT 10 /* LOG2(NBPG) */ 33*30407Skarels #define NPTEPG (NBPG/(sizeof (struct pte))) 3425681Ssam 35*30407Skarels #define DEV_BSIZE 1024 36*30407Skarels #define DEV_BSHIFT 10 /* log2(DEV_BSIZE) */ 37*30407Skarels #define BLKDEV_IOSIZE 1024 /* NBPG for physical controllers */ 38*30407Skarels 3925681Ssam #define CLSIZE 1 4025681Ssam #define CLSIZELOG2 0 4125681Ssam 42*30407Skarels #define SSIZE 2 /* initial stack size/NBPG */ 43*30407Skarels #define SINCR 2 /* increment of stack/NBPG */ 44*30407Skarels #define UPAGES 6 /* pages of u-area (2 stack pages) */ 4525681Ssam 4625681Ssam #define MAXCKEY 255 /* maximal allowed code key */ 4725681Ssam #define MAXDKEY 255 /* maximal allowed data key */ 4825681Ssam #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 4925681Ssam #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 5025681Ssam 5125681Ssam /* 5225681Ssam * Some macros for units conversion 5325681Ssam */ 5425681Ssam /* Core clicks (1024 bytes) to segments and vice versa */ 5525681Ssam #define ctos(x) (x) 5625681Ssam #define stoc(x) (x) 5725681Ssam 5825681Ssam /* Core clicks (1024 bytes) to disk blocks */ 5925681Ssam #define ctod(x) (x) 6025681Ssam #define dtoc(x) (x) 6125681Ssam #define dtob(x) ((x)<<PGSHIFT) 6225681Ssam 6325681Ssam /* clicks to bytes */ 6425681Ssam #define ctob(x) ((x)<<PGSHIFT) 6525681Ssam 6625681Ssam /* bytes to clicks */ 6725681Ssam #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 6825681Ssam 69*30407Skarels #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 70*30407Skarels ((unsigned)(bytes) >> DEV_BSHIFT) 71*30407Skarels #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 72*30407Skarels ((unsigned)(db) << DEV_BSHIFT) 73*30407Skarels 7425681Ssam /* 75*30407Skarels * Map a ``block device block'' to a file system block. 76*30407Skarels * This should be device dependent, and will be if we 77*30407Skarels * add an entry to cdevsw/bdevsw for that purpose. 78*30407Skarels * For now though just use DEV_BSIZE. 79*30407Skarels */ 80*30407Skarels #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 81*30407Skarels 82*30407Skarels /* 8325681Ssam * Macros to decode processor status word. 8425681Ssam */ 8525681Ssam #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 8625681Ssam #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 8725681Ssam 8825681Ssam #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 8929950Skarels #endif 90