Q22 support for DH/DM emulators

[Steven M. Schultz]

Subject: Q22 support for Emulex CS02
Index:	sys/dh.c,dmreg.h 2.10BSD

Description:
	There were major problems with DH/DM-11 type devices on
	the QBUS (Q22) 11/73 (presumably 11/53 also) systems.

Repeat-By:
	Observation.

Fix:
	Thanks to Paul Taylor (taylor at oswego.oswego.edu) for sending the
	following patches to /sys/pdpuba/{dh.c,dmreg.h}:

*** dh.c.old	Fri Aug  4 22:42:08 1989
--- dh.c	Sat Aug 26 23:11:29 1989
***************
*** 3,9 ****
   * All rights reserved.  The Berkeley software License Agreement
   * specifies the terms and conditions for redistribution.
   *
!  *	@(#)dh.c	1.1 (2.10BSD Berkeley) 12/1/86
   */
  
  /*
--- 3,9 ----
   * All rights reserved.  The Berkeley software License Agreement
   * specifies the terms and conditions for redistribution.
   *
!  *	@(#)dh.c	1.2 (2.10.1BSD Berkeley) 8/25/89
   */
  
  /*
***************
*** 410,418 ****
--- 410,424 ----
  #else
  				{
  				ubadr_t car;
+ #if defined(Q22)
+ 				struct dmdevice *dmaddr = (struct dmdevice *)dminfo[dh].ui_addr;
  
+ 				car = (ubadr_t)addr->dhcar;
+ 				car |= ((ubadr_t)(dmaddr->dmlst_h&077) << 16);
+ #else
  				car = (ubadr_t) addr->dhcar
  				    | (ubadr_t)(addr->dhsilo & 0300) << 10;
+ #endif defined(Q22)
  				cntr = car - cpaddr(tp->t_outq.c_cf);
  				ndflush(&tp->t_outq, cntr);
  				}
***************
*** 495,503 ****
--- 501,517 ----
  		addr->dhcar = (u_short)cpaddr(tp->t_outq.c_cf);
  #else
  		ubadr_t uba;
+ #if defined(Q22)
+ 		struct dmdevice *dmaddr = (struct dmdevice *)dminfo[dh].ui_addr;
+ #endif
  
  		uba = cpaddr(tp->t_outq.c_cf);
+ #if defined(Q22)
+                 addr->un.dhcsrl = (unit&017) | DH_IE;
+                 dmaddr->dmlst_h = hiint(uba) & 077;
+ #else
  		addr->un.dhcsrl = (unit&017) | DH_IE | ((hiint(uba)<<4)&060);
+ #endif defined(Q22)
  		addr->dhcar = loint(uba);
  #endif
  		{ short word = 1 << unit;
*** dmreg.h.old	Sat Jan 10 14:31:49 1987
--- dmreg.h	Sat Aug 26 23:01:07 1989
***************
*** 11,18 ****
   */
  struct dmdevice {
  	short	dmcsr;		/* control status register */
! 	short	dmlstat;	/* line status register */
! 	short	dmpad1[2];
  };
  
  /* bits in dm csr */
--- 11,24 ----
   */
  struct dmdevice {
  	short	dmcsr;		/* control status register */
! 	union	{               /* Q22:Need to access high byte independently */
! 		short dmlst_w;
! 		char dmlst_b[2];
! 		} cs02un;
! #define dmlstat cs02un.dmlst_w        /* line status register */
! #define dmlst_l cs02un.dmlst_b[0]     /* low byte */
! #define dmlst_h cs02un.dmlst_b[1]     /* high byte */
! 	short   dmpad1[2];
  };
  
  /* bits in dm csr */