August 2003 - Darwin-kernel

Mail and the Kernel
by David Blanton 18 Aug '03

18 Aug '03

I have been trying to understand how applications send mail i.e. What system functions are likely to be called to send mail. Can anyone give me to a starting point? Thanks. David Blanton _______________________________________________ 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: DB_NMI causes power button to drop kernel into debugger
by Garth Cummings 18 Aug '03

18 Aug '03

Hi Wally, On Sunday, August 17, 2003, at 07:04 PM, Wally Crooze wrote: The "Kernel Programming" manual indicates that the DB_NMI nvram option: nvram boot-args="debug=0x4" will drop into the debugger on NMI (Command-Power or interrupt switch), but I find that just pressing the Power alone will cause this. Is there any way to force that Command has to be pressed as well (I like to use Power alone to cause the system to sleep)? On newer systems without separate reset and NMI switches, if boot-args has the debug flags set, the power button then becomes an NMI button. Please see Technical Q&A 1264 for details: <http://developer.apple.com/qa/qa2001/qa1264.html>. HTH, --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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DB_NMI causes power button to drop kernel into debugger
by Wally Crooze 18 Aug '03

18 Aug '03

The "Kernel Programming" manual indicates that the DB_NMI nvram option: nvram boot-args="debug=0x4" will drop into the debugger on NMI (Command-Power or interrupt switch), but I find that just pressing the Power alone will cause this. Is there any way to force that Command has to be pressed as well (I like to use Power alone to cause the system to sleep)? -- Wally Crooze +-------------------------------------------------------+ | ,-_|\ Wally Crooze <wallycrooze(a)pobox.com> | | / \ | | \_,-._/ | | v | +-------------------------------------------------------+ _______________________________________________ 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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Mac OS X 10.2.6 & 3Com 3C90x Driver (part II)
by Robert J. Accettura 17 Aug '03

17 Aug '03

Downloaded the driver from here: http://www.opensource.apple.com/darwinsource/10.2.6/ Running Mac OS X 10.2.6, latest Developer Tools... in project builder, attempted to build it... Recieved: "Internal compiler error in instantiate_virtual_regs_1, at function.c:3999" Build failed (1 error) Does anyone else get this? More importantly, does anyone know how to resolve this? I find it odd that Apple's code doesn't compile right out of the box. Even more unusual being that this is one of the most popular Ethernet cards on the market in the Wintel side. Should really work if Darwin is to proove itself to Windows Drones. Thanks for the help. -- Robert J. Accettura robert(a)accettura.com [demime 0.98b removed an attachment of type application/x-pkcs7-signature which had a name of smime.p7s] _______________________________________________ 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: Using processor_info
by Brad Post 15 Aug '03

15 Aug '03

Thanks for the info, yes you are right I am trying to gather all this information from a kext (we have a networking kext), and I need to be able to support all flavors of 10.2, so I can't use the new APIs that I was told about for Panther/10.2.7. I saw that host_processor_info was in the Darwin Sources, but didn't find it in the HTML documentation so I wasn't sure if it was going to be safe to use. So what do you suggest I do to gather the processor information if I have to support 10.2 and later.... Thanks. Brad _______________________________________________ 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: Using processor_info
by Jim Magee 15 Aug '03

15 Aug '03

On Friday, August 15, 2003, at 9:31 AM, Brad Post wrote: I'm trying to get some information on the processor using the mach interfaces, and getting some weird results and wondering if anyone knows why? The function I am using is as follows: kern_return_t get_host_processors(void) { kern_return_t result; processor_array_t procArray; mach_msg_type_number_t procCount; processor_basic_info_data_t procInfo; mach_msg_type_number_t infoSize; host_t thisHost; host_priv_t thisPrivHost; unsigned long index; thisHost = (host_t) host_self(); thisPrivHost = (host_priv_t) host_priv_self(); /* * Host Processors */ result = host_processors(thisPrivHost, &procArray, &procCount); if (result == KERN_SUCCESS) { for (index = 0; index < procCount; index++) { infoSize = PROCESSOR_BASIC_INFO_COUNT; result = processor_info( procArray[index], PROCESSOR_BASIC_INFO, &thisHost, (processor_info_t) &procInfo, &infoSize); } } return (result); } For some reason the call to processor info always returns 0, and a valid infoSize, but all the data is always nil. You don't provide much "environment" information. But let me guess. You're calling this from a KEXT. Right? Actually, It's not that much of a guess, since host_priv_self() doesn't exist at user-space. While many Mach APIs work identically in and out of the kernel, that isn't true for all of them. Specifically, in-kernel interfaces that process or return out-of-line memory (or out-of-line arrays of ports) differ from their user-level counterparts. In this case, since host_processors() returns an out-of-line array of processors to user-space, but processors are represented by ports at user-space, what you are actually getting is an array of processor port pointers, NOT an array of processor pointers (due to a limitation in the MIG IDL tool that doesn't allow it to do on-the-fly outtrans conversions on arrays of object references, the routine does the conversion to ports itself). You can't take the resulting port pointers and just feed them into the processor_info() API. You're going to get wrong information, potentially corrupt the port data structure, and/or panic your system. You'd have to convert each port reference (send right) back into a processor reference and then pass it in. That's kind of cumbersome, as it requires you to call convert_port_to_processor() on each processor port, use the results in processor_info() and then potentially deallocate the processor reference you used (but in this specific case, since processors are live-forever objects, the kernel doesn't bother to track references so there is no deallocation necessary). And then don't forget to kfree() the memory that housed the port array (yep, in-kernel port arrays are transferred in kalloc memory, not vm_allocate memory). There is a host_processor_info() call that avoids the port/processor reference issues by returning an out-of-line array of processor info structures. But, as I stated before, out-of-line arrays of data are also treated differently (and, therefore, can't be accessed directly) from within the kernel. Having to embed all this Mach implementation knowledge in you KEXT is a pain for you and bad for us (if we even want to correct the MIG issue in the future or change the memory allocator to match user-space). That's why we don't really encourage calling random Mach APIs from KEXTs. Most of the information you are likely after is available from either IOKit registry/device tree interfaces, or (in Panther/Darwin 10.7) from a new sysctl() interface that is symmetric between user-space and kernel space. Those might be better places to look for this info. If you must use the Mach APIs, processor_info(current_proc()) at least doesn't leave you with all the issues of host_processors(). --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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Using processor_info
by Brad Post 15 Aug '03

15 Aug '03

I'm trying to get some information on the processor using the mach interfaces, and getting some weird results and wondering if anyone knows why? The function I am using is as follows: kern_return_t get_host_processors(void) { kern_return_t result; processor_array_t procArray; mach_msg_type_number_t procCount; processor_basic_info_data_t procInfo; mach_msg_type_number_t infoSize; host_t thisHost; host_priv_t thisPrivHost; unsigned long index; thisHost = (host_t) host_self(); thisPrivHost = (host_priv_t) host_priv_self(); /* * Host Processors */ result = host_processors(thisPrivHost, &procArray, &procCount); printf("\nhost_processors result = %08x\n", result); if (result == KERN_SUCCESS) { printf("size of procArray = %08x\n", procCount); for (index = 0; index < procCount; index++) { infoSize = PROCESSOR_BASIC_INFO_COUNT; result = processor_info( procArray[index], PROCESSOR_BASIC_INFO, &thisHost, (processor_info_t) &procInfo, &infoSize); printf("\n processor_info result = %08x\n", result); if (result == KERN_SUCCESS) { printf("procArray[ %ld ] = %08x\n", index, (int)(procArray[index])); printf("size of procInfo = %08x\n", infoSize); printf("procInfo.slot_num = %08x\n", procInfo.slot_num); printf("procInfo.is_master = %08x\n", procInfo.is_master); } } } return (result); } For some reason the call to processor info always returns 0, and a valid infoSize, but all the data is always nil. Thanks. Brad _______________________________________________ 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: MALLOC failing..
by Brian Tabone 15 Aug '03

15 Aug '03

The limit to wired memory will be the physical ram available, since wired memory is non-paged memory. The kernel has a certain amount reserved, so you will never be able to wire all available memory from user space, but by the time you get close, the system performance will be so poor, it wont matter. -Brian On Thursday, August 14, 2003, at 08:08 AM, Andrew Gallatin wrote: Brian Tabone writes: Andrew, There is a limit to how much memory you can allocate in the kernel space, if I remember correctly. On top of this, kernel memory is wired, so allocating large chunks has a very negative affect on system FWIW, a large percentage of the memory in the system is being wired for OS-Bypass networking via IOMemoryDescriptors which describe userspace addresses. Is there a restriction on the amount of wired memory in the system, such that if you have a lot of user memory wired, kernel memory allocations will fail? performance. I forget specifcally how to set the limit for kernel allocations unfortunately. That would be handy information. Thanks, Drew _______________________________________________ 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. _______________________________________________ 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: Difficulties obtaining the 6.6 APSL source code
by Kevin Van Vechten 15 Aug '03

15 Aug '03

Hi David, There is a known intermittent problem authenticating Apple IDs for accessing APSL sources. We're working to resolve the issue. It is intermittent, so trying again later may be successful. Sorry for the inconvenience. Also, the majority of the APSL projects are only available via the web at this time. - Kevin -- Kevin Van Vechten <kvv(a)apple.com> Open Source Software Engineer Apple Computer On Thursday, August 14, 2003, at 06:49 PM, David Lazaro Saz wrote: Hello, I've followed the different instructions on Apple's Developer web site in order to obtain the source code of the Darwin APSL components (6.6 specifically) and it simply doesn't work for me. It's getting frustrating. If I try to access it via web it dumps me to the Apple ID form again and again; if I try to use CVS I get a timeout; and if I try WebDAV access the 10.2.6 folders of the APSL components show empty. How are you people obtaining the source code? I imagine that it may not seem polite to send the same question two days in a row but, as I said, I tried it again a few minutes ago with no success. When I asked for help at Apple they pointed me to these mailing lists and I imagine that the people discussing Darwin's kernel have been able to access it somehow. If this is not the proper forum could somebody please point me to the correct one? TIA, David. _______________________________________________ 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. _______________________________________________ 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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Difficulties obtaining the 6.6 APSL source code
by David Lázaro Saz 15 Aug '03

15 Aug '03

Hello, I've followed the different instructions on Apple's Developer web site in order to obtain the source code of the Darwin APSL components (6.6 specifically) and it simply doesn't work for me. It's getting frustrating. If I try to access it via web it dumps me to the Apple ID form again and again; if I try to use CVS I get a timeout; and if I try WebDAV access the 10.2.6 folders of the APSL components show empty. How are you people obtaining the source code? I imagine that it may not seem polite to send the same question two days in a row but, as I said, I tried it again a few minutes ago with no success. When I asked for help at Apple they pointed me to these mailing lists and I imagine that the people discussing Darwin's kernel have been able to access it somehow. If this is not the proper forum could somebody please point me to the correct one? TIA, David. _______________________________________________ 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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