1 /* param.h 1.3 86/01/24 */ 2 3 /* 4 * Machine dependent constants for TAHOE. 5 */ 6 #define NBPG 1024 /* bytes/page */ 7 #define PGOFSET (NBPG-1) /* byte offset into page */ 8 #define PGSHIFT 10 /* LOG2(NBPG) */ 9 10 #define CLSIZE 1 11 #define CLSIZELOG2 0 12 13 #define SSIZE 2 /* initial stack size/NBPG */ 14 #define SINCR 2 /* increment of stack/NBPG */ 15 #define UPAGES 6 /* pages of u-area (2 stack pages) */ 16 17 #define MAXCKEY 255 /* maximal allowed code key */ 18 #define MAXDKEY 255 /* maximal allowed data key */ 19 #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 20 #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 21 22 /* 23 * Statistics maintained for code and 24 * data cache key allocations algorithms. 25 */ 26 struct keystats { 27 long ks_allocs; /* number of keys allocated */ 28 long ks_free; /* key allocated from free slot */ 29 long ks_norefs; /* key marked in use, but refcnt 0 */ 30 long ks_taken; /* key taken from single process */ 31 long ks_shared; /* key taken from multiple processes */ 32 }; 33 34 /* 35 * Some macros for units conversion 36 */ 37 /* Core clicks (1024 bytes) to segments and vice versa */ 38 #define ctos(x) (x) 39 #define stoc(x) (x) 40 41 /* Core clicks (1024 bytes) to disk blocks */ 42 #define ctod(x) (x) 43 #define dtoc(x) (x) 44 #define dtob(x) ((x)<<PGSHIFT) 45 46 /* clicks to bytes */ 47 #define ctob(x) ((x)<<PGSHIFT) 48 49 /* bytes to clicks */ 50 #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 51 52 /* 53 * Macros to decode processor status word. 54 */ 55 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 56 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 57 58 #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 59