April 2003 - Darwin-kernel - lists.apple.com

Startup disk check
by Eric Long 30 Apr '03

30 Apr '03

I have been testing to isolate a kernel panic caused by third party kext, which only occurs when my test kext loads before it. The test kext does almost nothing, but I have been playing with it to see if there's anything I can do. If the third party kext isn't loaded, no panic occurs. The panic is happening because the third party kext is actually calling panic(). While screwing with this I've had to do lots of rebooting. I'm using a laptop that's a couple of years old. I don't want to install the third party software on my desktop Mac. Rebooting takes forever and a day on Jaguar because of the disk verification check. Is there anyway to skip this check? Is it too risky to bypass? Thanks, Eric _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: mach_msg_rpc_from_kernel
by Jim Magee 30 Apr '03

30 Apr '03

On Wednesday, April 30, 2003, at 1:02 PM, Dave Koziol wrote: Can anyone point out anywhere in Darwin where this is used? Is this a "safe" facility to use? As Godfrey pointed out, the specific thread context you are in when calling this is critical. I guess the biggest question is: "Are you sure that blocking thread won't need to make forward progress itself in order to complete the RPC?" If you look at the Mach exception message delivery code (MIG-generated at BUILD/obj/RELEASE_<arch>/osfmk/RELEASE/mach/exc_user.c), you'll see that it uses this routine. A thread that takes an exception effectively is made to sequentially RPC to each of its registered exception handlers until one of them handles it. I need to perform some RPC calls from a KEXT into a user process, and block waiting for the results. This routine appears to do exactly that... This routine, like so many that part of the implementation of Mach, also deals with raw (naked) mach port rights. The code to manipulate these rights aren't really intended for public use. IOKit does some of the magic for you if you are using its UserClient facility. But those are most often used with mach_msg_send_from_kernel() to deliver one-way messages from within IOKit family drivers. But in either case, there is work planned to encapsulate that port right handling and the calling of the message delivery functions for IOKit clients. When available, we would really prefer that these be used instead of the raw Mach primitives. --Jim _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: vfs sample source
by raldrich＠mac.com 30 Apr '03

30 Apr '03

On Thursday, April 24, 2003, at 09:03 AM, Chris Rudolph wrote: Hi all, I've heard that there is some sample code for writing a vfs for macosx. I know I could just look at some of the vfs bits in the darwin sources, but trying to weed through everything is quite daunting. Does anyone have any suggestions? Thanks, Rudy. Rudy, I've found that the cddafs source code (darwin/src/notlive/cddafs) makes for good sample code for getting started. Its far better structured and more well commented than any of the other file systems (It feels like it was written by a 'classic' Mac engineer, rather than a Unix guru). It doesn't support writing, but by the time you reach that point, you'll have a pretty good understanding of what's needed for that anyway. Ron Aldrich Software Architects, Inc. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: mach_msg_rpc_from_kernel
by Godfrey van der Linden 30 Apr '03

30 Apr '03

Excuse me, what thread are you trying to block in the kernel? What sort of driver are you writing? In general we do not allow what you are trying to do. Godfrey At 13:02 -0400 03-4-30, Dave Koziol wrote: I've found this routine in ipc_mig.c, and it looks like it does exactly what I want to do for a particular project, but I haven't been able to find any code which actually uses it. Can anyone point out anywhere in Darwin where this is used? Is this a "safe" facility to use? I need to perform some RPC calls from a KEXT into a user process, and block waiting for the results. This routine appears to do exactly that... Thanks for any pointers in the right direction, _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: mach_msg_rpc_from_kernel
by Quinn 30 Apr '03

30 Apr '03

At 13:02 -0400 30/4/03, Dave Koziol wrote: I need to perform some RPC calls from a KEXT into a user process, and block waiting for the results. What type of KEXT? An I/O Kit driver? S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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mach_msg_rpc_from_kernel
by Dave Koziol 30 Apr '03

30 Apr '03

I've found this routine in ipc_mig.c, and it looks like it does exactly what I want to do for a particular project, but I haven't been able to find any code which actually uses it. Can anyone point out anywhere in Darwin where this is used? Is this a "safe" facility to use? I need to perform some RPC calls from a KEXT into a user process, and block waiting for the results. This routine appears to do exactly that... Thanks for any pointers in the right direction, Dave Koziol VP of Engineering IOXperts, Inc. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Kernel Extension
by Joey Echeverria 30 Apr '03

30 Apr '03

Thanks, that did it. -Joey On Monday, April 28, 2003, at 11:40 PM, Dean Reece wrote: Joey, Changes are you are installing it with the wrong permissions and so it won't load. Make sure the ownership and permissions match the one you are replacing. See http://developer.apple.com/techpubs/macosx/ReleaseNotes/ KernelExtensions.html for more info. Hope this helps, - Dean On Monday, April 28, 2003, at 08:18 PM, Joey Echeverria wrote: I'm trying to build the IOATAFamily.kext from the source code to replace the one that Darwin uses. I can build the extension on my Mac OSX partition, but when I try to replace the previous extension, Darwin no longer boots. It gets stuck waiting for the root device. Is there anything special that I have to do to get the extension to work? Are there build dependencies? The installation of Darwin I have is the Apple binary 6.02 release. -Joey Joseph G. Echeverria Department of Electrical and Computer Engineering Carnegie Mellon University _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Kernel Extension
by Garth Cummings 29 Apr '03

29 Apr '03

Hi Joey, On Monday, April 28, 2003, at 08:18 PM, Joey Echeverria wrote: I'm trying to build the IOATAFamily.kext from the source code to replace the one that Darwin uses. I can build the extension on my Mac OSX partition, but when I try to replace the previous extension, Darwin no longer boots. It gets stuck waiting for the root device. Is there anything special that I have to do to get the extension to work? Are there build dependencies? The installation of Darwin I have is the Apple binary 6.02 release. Dean's advice is excellent. Another possibility is that you built the family with logging enabled. I had a recent discussion with the IOATAFamily engineer in which he said trying to boot from an ATA drive with a logging version of the family installed likely won't work. The workaround would be to boot from another bus, FireWire for example. I haven't personally looked at this source, but I would suspect logging is enabled by a #define or -D compile line flag. Thanks, --gc _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Re: Kernel Extension
by Dean Reece 29 Apr '03

29 Apr '03

Joey, Changes are you are installing it with the wrong permissions and so it won't load. Make sure the ownership and permissions match the one you are replacing. See http://developer.apple.com/techpubs/macosx/ReleaseNotes/ KernelExtensions.html for more info. Hope this helps, - Dean On Monday, April 28, 2003, at 08:18 PM, Joey Echeverria wrote: I'm trying to build the IOATAFamily.kext from the source code to replace the one that Darwin uses. I can build the extension on my Mac OSX partition, but when I try to replace the previous extension, Darwin no longer boots. It gets stuck waiting for the root device. Is there anything special that I have to do to get the extension to work? Are there build dependencies? The installation of Darwin I have is the Apple binary 6.02 release. -Joey Joseph G. Echeverria Department of Electrical and Computer Engineering Carnegie Mellon University _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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Kernel Extension
by Joey Echeverria 29 Apr '03

29 Apr '03

I'm trying to build the IOATAFamily.kext from the source code to replace the one that Darwin uses. I can build the extension on my Mac OSX partition, but when I try to replace the previous extension, Darwin no longer boots. It gets stuck waiting for the root device. Is there anything special that I have to do to get the extension to work? Are there build dependencies? The installation of Darwin I have is the Apple binary 6.02 release. -Joey Joseph G. Echeverria Department of Electrical and Computer Engineering Carnegie Mellon University _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

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