1 /* param.h 1.6.1.1 87/04/02 */ 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 #define NPTEPG (NBPG/(sizeof (struct pte))) 34 35 #define KERNBASE 0xc0000000 /* start of kernel virtual */ 36 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 37 38 #ifndef SECSIZE 39 #define DEV_BSIZE 1024 40 #define DEV_BSHIFT 10 /* log2(DEV_BSIZE) */ 41 #define BLKDEV_IOSIZE 1024 /* NBPG for physical controllers */ 42 #else SECSIZE 43 /* 44 * Devices without disk labels and the swap virtual device 45 * use "blocks" of exactly pagesize. Devices with disk labels 46 * use device-dependent sector sizes for block and character interfaces. 47 */ 48 #define DEV_BSIZE NBPG 49 #define DEV_BSHIFT PGSHIFT /* log2(DEV_BSIZE) */ 50 #define BLKDEV_IOSIZE NBPG /* NBPG for unlabeled block devices */ 51 #endif SECSIZE 52 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 53 54 #define CLSIZE 1 55 #define CLSIZELOG2 0 56 57 #define SSIZE 2 /* initial stack size/NBPG */ 58 #define SINCR 2 /* increment of stack/NBPG */ 59 #define UPAGES 6 /* pages of u-area (2 stack pages) */ 60 61 #define MAXCKEY 255 /* maximal allowed code key */ 62 #define MAXDKEY 255 /* maximal allowed data key */ 63 #define NCKEY (MAXCKEY+1) /* # code keys, including 0 (reserved) */ 64 #define NDKEY (MAXDKEY+1) /* # data keys, including 0 (reserved) */ 65 66 /* 67 * Some macros for units conversion 68 */ 69 /* Core clicks (1024 bytes) to segments and vice versa */ 70 #define ctos(x) (x) 71 #define stoc(x) (x) 72 73 #ifndef SECSIZE 74 /* Core clicks (1024 bytes) to disk blocks */ 75 #define ctod(x) (x) 76 #define dtoc(x) (x) 77 #define dtob(x) ((x)<<PGSHIFT) 78 #else SECSIZE 79 /* Core clicks (1024 bytes) to disk blocks; deprecated */ 80 #define ctod(x) (x) /* XXX */ 81 #define dtoc(x) (x) /* XXX */ 82 #define dtob(x) ((x)<<PGSHIFT) /* XXX */ 83 #endif SECSIZE 84 85 /* clicks to bytes */ 86 #define ctob(x) ((x)<<PGSHIFT) 87 88 /* bytes to clicks */ 89 #define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT)) 90 91 #ifndef SECSIZE 92 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 93 ((unsigned)(bytes) >> DEV_BSHIFT) 94 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 95 ((unsigned)(db) << DEV_BSHIFT) 96 97 /* 98 * Map a ``block device block'' to a file system block. 99 * This should be device dependent, and will be if we 100 * add an entry to cdevsw/bdevsw for that purpose. 101 * For now though just use DEV_BSIZE. 102 */ 103 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 104 #else SECSIZE 105 /* bytes to "disk blocks" and back; deprecated */ 106 #define btodb(bytes) ((unsigned)(bytes) >> DEV_BSHIFT) /* XXX */ 107 #define dbtob(db) ((unsigned)(db) << DEV_BSHIFT) /* XXX */ 108 #endif SECSIZE 109 110 /* 111 * Macros to decode processor status word. 112 */ 113 #define USERMODE(ps) (((ps) & PSL_CURMOD) == PSL_CURMOD) 114 #define BASEPRI(ps) (((ps) & PSL_IPL) == 0) 115 116 #define DELAY(n) { register int N = 3*(n); while (--N > 0); } 117 #endif 118