1 /* param.h 1.4 86/11/03 */ 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 #define NBPG 1024 /* bytes/page */ 18 #define PGOFSET (NBPG-1) /* byte offset into page */ 19 #define PGSHIFT 10 /* LOG2(NBPG) */ 20 21 #define CLSIZE 1 22 #define CLSIZELOG2 0 23 24 #define SSIZE 2 /* initial stack size/NBPG */ 25 #define SINCR 2 /* increment of stack/NBPG */ 26 #define UPAGES 6 /* pages of u-area (2 stack pages) */ 27 28 #define MAXCKEY 255 /* maximal allowed code key */ 29 #define MAXDKEY 255 /* maximal allowed data key */ 30 #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 31 #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 32 33 /* 34 * Some macros for units conversion 35 */ 36 /* Core clicks (1024 bytes) to segments and vice versa */ 37 #define ctos(x) (x) 38 #define stoc(x) (x) 39 40 /* Core clicks (1024 bytes) to disk blocks */ 41 #define ctod(x) (x) 42 #define dtoc(x) (x) 43 #define dtob(x) ((x)<<PGSHIFT) 44 45 /* clicks to bytes */ 46 #define ctob(x) ((x)<<PGSHIFT) 47 48 /* bytes to clicks */ 49 #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 50 51 /* 52 * Macros to decode processor status word. 53 */ 54 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 55 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 56 57 #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 58 #endif 59