1 /* 2 * Machine dependent constants for Intel 386. 3 */ 4 5 #define MACHINE "i386" 6 7 #ifndef BYTE_ORDER 8 #include <machine/endian.h> 9 #endif 10 11 #define NBPG 4096 /* bytes/page */ 12 #define PGOFSET (NBPG-1) /* byte offset into page */ 13 #define PGSHIFT 12 /* LOG2(NBPG) */ 14 #define NPTEPG (NBPG/(sizeof (struct pte))) 15 16 #define NBPDR (1024*NBPG) /* bytes/page dir */ 17 #define PDROFSET (NBPDR-1) /* byte offset into page dir */ 18 #define PDRSHIFT 22 /* LOG2(NBPDR) */ 19 20 #define KERNBASE 0xFE000000 /* start of kernel virtual */ 21 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 22 23 #define DEV_BSIZE 512 24 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 25 #define BLKDEV_IOSIZE 2048 26 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 27 28 #define CLSIZE 1 29 #define CLSIZELOG2 0 30 31 #define SSIZE 1 /* initial stack size/NBPG */ 32 #define SINCR 1 /* increment of stack/NBPG */ 33 34 #define UPAGES 3 /* pages of u-area */ 35 36 /* 37 * Some macros for units conversion 38 */ 39 /* Core clicks (4096 bytes) to segments and vice versa */ 40 #define ctos(x) (x) 41 #define stoc(x) (x) 42 43 /* Core clicks (4096 bytes) to disk blocks */ 44 #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) 45 #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) 46 #define dtob(x) ((x)<<DEV_BSHIFT) 47 48 /* clicks to bytes */ 49 #define ctob(x) ((x)<<PGSHIFT) 50 51 /* bytes to clicks */ 52 #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) 53 54 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 55 ((unsigned)(bytes) >> DEV_BSHIFT) 56 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 57 ((unsigned)(db) << DEV_BSHIFT) 58 59 /* 60 * Map a ``block device block'' to a file system block. 61 * This should be device dependent, and will be if we 62 * add an entry to cdevsw/bdevsw for that purpose. 63 * For now though just use DEV_BSIZE. 64 */ 65 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) 66 67 #ifdef KERNEL 68 #ifndef LOCORE 69 int cpuspeed; 70 #endif 71 #define DELAY(n) { register int N = cpuspeed * (n); while (--N > 0); } 72 73 #else KERNEL 74 #define DELAY(n) { register int N = (n); while (--N > 0); } 75 #endif KERNEL 76