Date: Thu, 27 Jan 2005 14:18:06 +1000 From: Peter Grehan <grehan@freebsd.org> To: David Leimbach <leimy2k@mac.com> Cc: freebsd-ppc@freebsd.org Subject: Re: Mac mini and FreeBSD - buildworld Message-ID: <41F86B7E.3030006@freebsd.org> In-Reply-To: <4d31b98a8d4f2abc19afd42edf17bf68@mac.com> References: <41F170F1.2010701@finnovative.net> <p06200731be1731cf8ec8@[128.113.24.47]> <p06200732be184e814933@[128.113.24.47]> <41F3AFBD.60505@freebsd.org> <p06200737be19ffbdd478@[128.113.24.47]> <41F47300.3050406@freebsd.org> <p0620073abe1a23663046@[128.113.24.47]> <41F47C1C.2060608@freebsd.org> <p0620073cbe1a32f4d595@[128.113.24.47]> <41F48BBB.3080708@freebsd.org> <p06200744be1c8a745957@[128.113.24.47]> <41F8678A.5020005@freebsd.org> <4d31b98a8d4f2abc19afd42edf17bf68@mac.com>
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David Leimbach wrote: >> >> If it doesn't respond to outside pings, I'd say it's hung. There's >> no easy way to generate an NMI on Mac platforms, so it's time to >> reboot :( >> > > Command-Power on powerbooks does an NMI IIRC. It's not *really* an NMI, since AFIK and looking at Darwin source, the external PMU generates an external interrupt in this case. These can be masked on PPC by clearing the PSL_EE bit in the machine status register. There are times when FreeBSD might be stuck in a loop with PSL_EE cleared, and you still want to break in, for example by generating a RESET interrupt and not an external interrupt. It would still be useful to support the PMU-generated Command-Power interrupt however :) later, Peter.
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