Re: Using simh anyone?

[uwe%stderr.spb.ru@localhost (Valeriy E. Ushakov)]

Dave McGuire <mcguire%neurotica.com@localhost> wrote:

> On 02/26/2012 03:02 PM, Valeriy E. Ushakov wrote:
>>> Is anyone using simh (heavily) for vax hacking?
>>>
>>> I have tried to use simh-vax on both 32 and 64-bit Ubuntu, but the
>>> simulator crashes as soon
>>> as the qe adapter is used more heavily, somewhere deep in the emulator
>>> routines.
>>>
>>> Anyone got some experience to share?
>>
>> I run NetBSD/vax (5.x) under simh on my corporate Windows 7 laptop.  I
>> only hacked the kernel a bit to use SPL 1 for idle since that's what
>> simh uses to detect idle for NetBSD.
> 
>   I'm very much interested in learning more about that patch, if you 
> have a moment.

Must be this one

Index: sys/kern/kern_idle.c
===================================================================
RCS file: /cvsroot/src/sys/kern/kern_idle.c,v
retrieving revision 1.21
diff -u -p -r1.21 kern_idle.c
--- sys/kern/kern_idle.c        11 Jun 2008 13:42:02 -0000      1.21
+++ sys/kern/kern_idle.c        27 Feb 2012 01:32:14 -0000
@@ -64,6 +64,10 @@ idle_loop(void *dummy)
 
        KERNEL_UNLOCK_ALL(l, NULL);
        l->l_stat = LSONPROC;
+
+#ifdef __vax__
+       s = splraiseipl(makeiplcookie(1)); /* for SIMH idle detection */
+#endif
        for (;;) {
                LOCKDEBUG_BARRIER(NULL, 0);
                KASSERT((l->l_flag & LW_IDLE) != 0);
@@ -85,11 +89,18 @@ idle_loop(void *dummy)
                                }
                        }
                }
+
+#ifdef __vax__
+               splx(s);
+#endif
                KASSERT(l->l_mutex == l->l_cpu->ci_schedstate.spc_lwplock);
                lwp_lock(l);
                mi_switch(l);
                KASSERT(curlwp == l);
                KASSERT(l->l_stat == LSONPROC);
+#ifdef __vax__
+               s = splraiseipl(makeiplcookie(1)); /* for SIMH idle detection */
+#endif
        }
 }
 


-uwe