run spl6 for dz SAE

[unix-history] / usr / src / sys / vax / uba / dh.c

diff --git a/usr/src/sys/vax/uba/dh.c b/usr/src/sys/vax/uba/dh.c
index 37f414b..a81cb2e 100644 (file)
--- a/usr/src/sys/vax/uba/dh.c
+++ b/usr/src/sys/vax/uba/dh.c
@@ -1,4 +1,4 @@
-/*     dh.c    3.5     %H%     */
+/*     dh.c    3.6     %H%     */

 
 /*
  *     DH-11 driver
 
 /*
  *     DH-11 driver


@@ -18,6 +18,18 @@
 #include "../h/uba.h"
 #include "../h/bk.h"
 
 #include "../h/uba.h"
 #include "../h/bk.h"
 

+/*
+ * When running dz's using only SAE (silo alarm) on input
+ * it is necessary to call dzrint() at clock interrupt time.
+ * This is unsafe unless spl5()s in tty code are changed to
+ * spl6()s to block clock interrupts.  Note that the dh driver
+ * currently in use works the same way as the dz, even though
+ * we could try to more intelligently manage its silo.
+ * Thus don't take this out if you have no dz's unless you
+ * change clock.c and dhtimer().
+ */
+#define        spl5    spl6
+

 #define        DHADDR  ((struct device *)(UBA0_DEV + 0160020))
 #define        NDH11   16      /* number of lines */
 #define UBACVT(x) (cbase + (short)((x)-(char *)cfree))
 #define        DHADDR  ((struct device *)(UBA0_DEV + 0160020))
 #define        NDH11   16      /* number of lines */
 #define UBACVT(x) (cbase + (short)((x)-(char *)cfree))


@@ -309,7 +321,9 @@ dhxint(dev)
        register struct device *addr;
        register d;
        short ttybit, bar, *sbar;
        register struct device *addr;
        register d;
        short ttybit, bar, *sbar;

+       int s;

 
 

+       s = spl6();     /* block the clock */

        d = minor(dev) & 0177;
        addr = DHADDR + d;
        addr->un.dhcsr &= (short)~XINT;
        d = minor(dev) & 0177;
        addr = DHADDR + d;
        addr->un.dhcsr &= (short)~XINT;


@@ -339,6 +353,7 @@ dhxint(dev)
                                dhstart(tp);
                }
        }
                                dhstart(tp);
                }
        }

+       splx(s);

 }
 
 /*
 }
 
 /*