Source to include/mach/param.h

0001  /*
0002   * param.h
0003   *	Global parameters
0004   */
0005  #ifndef _MACHPARAM_H
0006  #define _MACHPARAM_H
0007  
0008  /*
0009   * Values and macros relating to hardware pages
0010   */
0011  #define NBPG (4096)	/* # bytes in a page */
0012  #define NBBY (8)	/* # bits in a byte */
0013  #define PGSHIFT (12)	/* LOG2(NBPG) */
0014  #define ptob(x) ((ulong)(x) << PGSHIFT)
0015  #define btop(x) ((ulong)(x) >> PGSHIFT)
0016  #define btorp(x) (((ulong)(x) + (NBPG-1)) >> PGSHIFT)
0017  
0018  /*
0019   * How often our clock "ticks"
0020   */
0021  #define HZ (20)
0022  
0023  /*
0024   * Which console device to use for printf() and such
0025   */
0026  #undef SERIAL		/* Define for COM1, else use screen */
0027  
0028  #endif /* _MACHPARAM_H */