clock.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*
 * @(#)clock.h	4.2	(ULTRIX)	8/9/90
 */
/************************************************************************
 *									*
 *			Copyright (c) 1985,86,87,88,89 by		*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
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 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
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 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/


/* ------------------------------------------------------------------------
 * Modification History:
 *
 * 27-Mar-90 	Randall Brown
 *	File now contains generic clock declarations.
 *
 * ------------------------------------------------------------------------
 */


/*
 * VAX clock registers
 */

#define	ICCS_RUN	0x00000001
#define	ICCS_TRANS	0x00000010
#define	ICCS_SS		0x00000020
#define	ICCS_IE		0x00000040
#define	ICCS_INT	0x00000080
#define	ICCS_ERR	0x80000000
	
/*
 * General time definitions
 */
#define	SECMIN	((unsigned)60)			/* seconds per minute */
#define	SECHOUR	((unsigned)(60*SECMIN))		/* seconds per hour */
#define	SECDAY	((unsigned)(24*SECHOUR))	/* seconds per day */
#define	SECYR	((unsigned)(365*SECDAY))	/* sec per reg year */

#define	YRREF		1970
#define	LEAPYEAR(year)	((year)%4==0)	/* good till time becomes negative */
#define	BASEYEAR	72			/* MUST be a leap year */


/* - burns - taken from ka650.h
 * Bits in TCR0/TCR1: Programable Timer Control Registers (cvqssc->cvq4_tcrx)
 * (The rest of the bits are the same as in the standard VAX
 *  Interval timer and are defined in clock.h)
 */
#define TCR_STP 0x00000004		/* <2>  Stop after time-out */