1 /* param.h 1.5 87/01/16 */ 2 3 /* 4 * Machine dependent constants for TAHOE. 5 */ 6 7 #ifndef ENDIAN 8 /* 9 * Definitions for byte order, 10 * according to byte significance from low address to high. 11 */ 12 #define LITTLE 1234 /* least-significant byte first (vax) */ 13 #define BIG 4321 /* most-significant byte first */ 14 #define PDP 3412 /* LSB first in word, MSW first in long (pdp) */ 15 #define ENDIAN BIG /* byte order on tahoe */ 16 17 /* 18 * Macros for network/external number representation conversion. 19 */ 20 #if ENDIAN == BIG && !defined(lint) 21 #define ntohl(x) (x) 22 #define ntohs(x) (x) 23 #define htonl(x) (x) 24 #define htons(x) (x) 25 #else 26 u_short ntohs(), htons(); 27 u_long ntohl(), htonl(); 28 #endif 29 30 #define NBPG 1024 /* bytes/page */ 31 #define PGOFSET (NBPG-1) /* byte offset into page */ 32 #define PGSHIFT 10 /* LOG2(NBPG) */ 33 34 #define CLSIZE 1 35 #define CLSIZELOG2 0 36 37 #define SSIZE 2 /* initial stack size/NBPG */ 38 #define SINCR 2 /* increment of stack/NBPG */ 39 #define UPAGES 6 /* pages of u-area (2 stack pages) */ 40 41 #define MAXCKEY 255 /* maximal allowed code key */ 42 #define MAXDKEY 255 /* maximal allowed data key */ 43 #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 44 #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 45 46 /* 47 * Some macros for units conversion 48 */ 49 /* Core clicks (1024 bytes) to segments and vice versa */ 50 #define ctos(x) (x) 51 #define stoc(x) (x) 52 53 /* Core clicks (1024 bytes) to disk blocks */ 54 #define ctod(x) (x) 55 #define dtoc(x) (x) 56 #define dtob(x) ((x)<<PGSHIFT) 57 58 /* clicks to bytes */ 59 #define ctob(x) ((x)<<PGSHIFT) 60 61 /* bytes to clicks */ 62 #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 63 64 /* 65 * Macros to decode processor status word. 66 */ 67 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 68 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 69 70 #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 71 #endif 72