Re: Clock Error

Jan-Benedict Glaw <[email protected]> Tue, 19 Dec 2023 23:50:23 +0100

Newsgroups	gmane.os.netbsd.ports.vax
Message-ID	<[email protected]>

On Tue, 2023-12-19 17:45:34 -0500, Mouse <[email protected]> wrote:
> >> I wonder if idle detection plays a role...
> > I have idle detection enabled, and it is working.
> 
> Oh, that reminds me: what is it that simh recognizes as an idle loop?
> Someone quoted the code here, but (a) that was a long time ago and I'm
> not sure I can find it easily and (b) it doesn't clearly delinate what
> signals simh versus what is unrelated accident-of-the-implementation
> code.


sys/arch/vax/include/cpu.h:

168 /*
169  * This allows SIMH to recognize the kernel wants to sleep.
170  */
171 static inline void
172 cpu_idle(void)
173 {
174         int ipl = mfpr(PR_IPL);
175         mtpr(1, PR_IPL);
176         mtpr(ipl, PR_IPL);
177 }


MfG, JBG

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