/* * Define constants and structures for the Highball board. */#ifndef EXT_CLOCK#define EXT_CLOCK#endif /* EXT_CLOCK *//* * Ominous note: the register address is valid only for slot 1. */#define	HIGH_ADDR	0xfa800000 	/* physical address of regs */#define MAXDIFF		1000		/* max system - hightime (s) *//* * Control/status register decode */#define DIV5		0		/* divide by 5 */#define DIV4		2		/* divide by 4 */#define DIV6		3		/* divide by 6 *//* * Error return codes */#define EBADTIME        -1              /* invalid highball time *//* * Data/control/status registers */#ifndef	LOCOREstruct highregs {	u_long	csr;		/* control/status register */	u_long	cnt_w0;		/* counter bits [0:15] latched */	u_long	cnt_w1;		/* counter bits [16:17] */	u_long	cnt_w2;		/* counter bits [32:47] */	u_long	cnt_w3;		/* counter bits [48:63] */	u_long	padding[2];	/* (barf, gag) */	u_long	clock_strobe;	/* latch counter (write only) */};#endif	/* !LOCORE */