4.4BSD/usr/src/sys/tahoe/tahoe/mem.h

/*
 *	@(#)mem.h	7.1 (Berkeley) 5/21/88
 */

/*
 * Memory controller registers
 *
 */


/*
 * Some bits definition for MCR
 */

#define	EED	0x01		/* Enable error detection */
#define	EEC	0x02		/* Enable error correction */
#define	WMD	0x04		/* Write memory diagnostic */
#define	RMD	0x08		/* Read memory diagnostic */
#define	INT	0x20		/* Init = power on bit */
#define	CEC	0x40		/* Clear error count */
#define	CME	0x80		/* Clear memory error */
#define	CMEC	0xff00		/* Corrected memory error count (mask) */

/* shifts to get the values of MCR fields. */
 
#define	EECSHFT		0x01		/* Enable error correction */
#define	WMDSHFT		0x02		/* Write memory diagnostic */
#define	RMDSHFT		0x03		/* Read memory diagnostic */
#define	INTSHFT		0x05		/* Init = power on bit */
#define	CECSHFT		0x06		/* Clear error count */
#define	CMESHFT		0x07		/* Clear memory error */
#define	CMECSHFT	0x08		/* Corrected memory error count (mask) */
/*
 * MER bits
 */

#define	ERRCD	0x07		/* Error code (mask) */
#define    APE	1	/* Address parity error */
#define    DPE	2	/* Data parity error */
#define    DCE	3	/* Data check error */
#define    VTO	4	/* Versabus timeout */
#define    VBE	5	/* Versabus error */
#define    NEM	6	/* Non-existent memory */

#define	AXE	0x08		/* Adapter external error */
#define	ERM	0x10		/* Error master (0=CPU, 1=Versabus) */
#define	IVV	0x100		/* Illegal Versabus vector */

/*
 * MCBR bits
 */

#define	MCBR	0xffff0000
#define	MEAR	0xffff0000