Date: Thu, 25 Mar 2004 09:31:56 -0800 From: "Moore, Robert" <robert.moore@intel.com> To: "Nate Lawson" <nate@root.org> Cc: current@freebsd.org Subject: RE: [acpi-jp 3117] RE: ACPI-CA 20040311 imported Message-ID: <37F890616C995246BE76B3E6B2DBE055201511@orsmsx403.jf.intel.com>
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I think I've seen recursion in some IBM ASL. Also, since iASL reports a remark when it detects a recursive call, every now and then someone complains. Bob -----Original Message----- From: Nate Lawson [mailto:nate@root.org]=20 Sent: Thursday, March 18, 2004 11:11 PM To: Moore, Robert Cc: acpi-jp@jp.FreeBSD.org; current@freebsd.org Subject: Re: [acpi-jp 3117] RE: ACPI-CA 20040311 imported > -----Original Message----- > From: owner-acpi-jp@jp.FreeBSD.org [mailto:owner-acpi-jp@jp.FreeBSD.org] > On Behalf Of Nate Lawson > Sent: Thursday, March 18, 2004 10:47 AM > To: current@freebsd.org; acpi-jp@jp.FreeBSD.org > Subject: [acpi-jp 3116] ACPI-CA 20040311 imported > > See src/sys/contrib/dev/acpica/CHANGES.txt for specific changes. > > The main change is that we now support _OSI to announce we're compatible > with all the NT-derived MS systems. Also, we now serialize all method > execution as some ASL depends on this behavior. The MS interpreter > doesn't support parallel execution, hence this matches their behavior. > > If there are problems with these features, please try the tunables: > > hw.acpi.osi_method > hw.acpi.serialize_methods > > You can disable each feature by setting it to 0 at the loader prompt or > loader.conf. On Thu, 18 Mar 2004, Moore, Robert wrote: > 1) If you serialize all methods by default, you will prohibit recursive > methods. That's why we made this an option for Linux, and the default > is to allow reentrant methods. > > 2) We are not really sure about the MS interpreter. They claim that > they support reentrant methods and allow multiple threads to execute. > But we see problems with the coding of reentrant ASL methods that imply > that that multiple threads never execute control methods concurrently on > Win* Interesting. Do you know of any ASL that uses recursive methods? I haven't ever found any like that. If you don't have a counter-example, I'm happy to let this sit in the tree for a little while to see if it solves problems or breaks things for people. If we don't turn it on by default, it won't get the testing it needs. -Nate
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