From owner-freebsd-ppc  Wed Jul 24 15:21:24 2002
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Date: Thu, 25 Jul 2002 08:39:20 +1000
From: Peter Grehan <peterg@ptree32.com.au>
Organization: Ptree32 Pty Ltd
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To: freebsd-ppc@FreeBSD.ORG
Subject: Re: psim non-blocking i/o
References: <3D3CA108.5CCABC4E@ptree32.com.au> <1027517635.3d3eacc358a89@www.wantpackets.com>
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Hi Andy,

>  I did this with partial success.  This only seems to work with the stand-alone
> version, and did not work for the internal version (internal to gdb). I was
> using gdb-5.2 sources.

 Ah yes, I did find the same problem. I'll have a look into why it's
blocking with psim-gdb and not psim. I'm also using 5.2.

> pmap_release: does not really exist (HELP!)

 This isn't too bad. All that will happen is that the system will
eventually use all NPMAPS unique id's to put into segment descriptors.
The fix (taken from NetBSD) is:

void
pmap_release(pmap_t pmap)
{
        int idx, mask;
        
        /*
         * Free segment register's VSID
         */
        if (pmap->pm_sr[0] == 0)
                panic("pmap_release");

        idx = VSID_TO_HASH(pmap->pm_sr[0]) & (NPMAPS-1);
        mask = 1 << (idx % VSID_NBPW);
        idx /= VSID_NBPW;
        pmap_vsid_bitmap[idx] &= ~mask;
}

later,

Peter.

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