1 /* param.h 1.9 87/05/21 */ 2 3 /* 4 * Machine dependent constants for TAHOE. 5 */ 6 7 #define MACHINE "tahoe" 8 9 #ifndef ENDIAN 10 /* 11 * Definitions for byte order, 12 * according to byte significance from low address to high. 13 */ 14 #define LITTLE 1234 /* least-significant byte first (vax) */ 15 #define BIG 4321 /* most-significant byte first */ 16 #define PDP 3412 /* LSB first in word, MSW first in long (pdp) */ 17 #define ENDIAN BIG /* byte order on tahoe */ 18 19 /* 20 * Macros for network/external number representation conversion. 21 */ 22 #if ENDIAN == BIG && !defined(lint) 23 #define ntohl(x) (x) 24 #define ntohs(x) (x) 25 #define htonl(x) (x) 26 #define htons(x) (x) 27 #else 28 unsigned short ntohs(), htons(); 29 unsigned long ntohl(), htonl(); 30 #endif 31 32 #define NBPG 1024 /* bytes/page */ 33 #define PGOFSET (NBPG-1) /* byte offset into page */ 34 #define PGSHIFT 10 /* LOG2(NBPG) */ 35 #define NPTEPG (NBPG/(sizeof (struct pte))) 36 37 #define KERNBASE 0xc0000000 /* start of kernel virtual */ 38 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 39 40 #define DEV_BSIZE 1024 41 #define DEV_BSHIFT 10 /* log2(DEV_BSIZE) */ 42 #define BLKDEV_IOSIZE 1024 /* NBPG for physical controllers */ 43 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 44 45 #define CLSIZE 1 46 #define CLSIZELOG2 0 47 48 #define SSIZE 2 /* initial stack size/NBPG */ 49 #define SINCR 2 /* increment of stack/NBPG */ 50 #define UPAGES 6 /* pages of u-area (2 stack pages) */ 51 52 #define MAXCKEY 255 /* maximal allowed code key */ 53 #define MAXDKEY 255 /* maximal allowed data key */ 54 #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 55 #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 56 57 /* 58 * Some macros for units conversion 59 */ 60 /* Core clicks (1024 bytes) to segments and vice versa */ 61 #define ctos(x) (x) 62 #define stoc(x) (x) 63 64 /* Core clicks (1024 bytes) to disk blocks */ 65 #define ctod(x) (x) 66 #define dtoc(x) (x) 67 #define dtob(x) ((x)<<PGSHIFT) 68 69 /* clicks to bytes */ 70 #define ctob(x) ((x)<<PGSHIFT) 71 72 /* bytes to clicks */ 73 #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 74 75 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 76 ((unsigned)(bytes) >> DEV_BSHIFT) 77 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 78 ((unsigned)(db) << DEV_BSHIFT) 79 80 /* 81 * Map a ``block device block'' to a file system block. 82 * This should be device dependent, and will be if we 83 * add an entry to cdevsw/bdevsw for that purpose. 84 * For now though just use DEV_BSIZE. 85 */ 86 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 87 88 /* 89 * Macros to decode processor status word. 90 */ 91 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 92 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 93 94 #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 95 #endif 96