May 2002 - Darwin-kernel - lists.apple.com

serial console
by Andrew Gallatin 14 May '02

14 May '02

Previously, my questions on how to run OS-X or Darwin with a serial console have gotten no reply. I'd assumed it just wasn't possible. However, today I noticed that according to the web page for the new "Xserv" (http://www.apple.com/xserve/) it features: Serial console for UNIX-savvy administrators Prefer to rule your domain through command line server management tools? The serial port lets you do just that. Since OS-X server is based on Darwin, I'd assume that one can run a serial console in Darwin on older Macs (assuming one has a G4-port, or similar; I do). Can somebody please tell me how to enable a serial console so that I can use for OS-X (and not just OpenFirmware & NetBSD). 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.

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Re: Booting Darwin 6.0 on a PBG4
by Ethan Clark 14 May '02

14 May '02

On 5/13/02 5:27 PM, "David A. Gatwood" <dgatwood(a)gatwood.net> wrote: > What base system is installed? What compiler did you use to build it? It's OS X 10.1.4, so it's XNU 201.19.3, and the compiler that came with the Developer Tools CD (v. 2.95.2 19991024). Is that enough information? _______________________________________________ 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: Booting Darwin 6.0 on a PBG4
by David A. Gatwood 14 May '02

14 May '02

On Mon, 13 May 2002, Ethan Clark wrote: > Hey, I just compiled XNU 262 and tried rebooting with the new kernel image, > but I get a panic due to the apparent lack of a driver for PowerBook 3,2. > Any ideas would be helpful, as I don't know where to come up with this item, > and thought I already had it. What base system is installed? What compiler did you use to build it? Later, David --------------------------------------------------------------------- David A. Gatwood dgatwood(a)gatwood.net Developer Docs Writer dgatwood(a)apple.com Apple Computer dgatwood(a)mklinux.org Check out my weekly web comic: http://www.techmagazine.org _______________________________________________ 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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Booting Darwin 6.0 on a PBG4
by Ethan Clark 14 May '02

14 May '02

Hey, I just compiled XNU 262 and tried rebooting with the new kernel image, but I get a panic due to the apparent lack of a driver for PowerBook 3,2. Any ideas would be helpful, as I don't know where to come up with this item, and thought I already had it. Ethan Clark _______________________________________________ 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: Code loading and executing
by Josh de Cesare 10 May '02

10 May '02

Adrian, You are almost certainly running into a problem with the G3/G4's split L1 I and D caches. Basically what happens is that the L1 I cache can contain stale bit after the D cache get loaded with your code. After you copy the code into your mmap created buffer, call msync on it with the MS_INVALIDATE option. This should cause the kernel to flush the dcache for that region then invalidate the icache for the region. After that, it should behave as expected. Josh At 8:43 PM +0300 5/10/02, Adrian MARINESCU wrote: Hi there! I'm not sure that this list is what I'm looking for, but maybe someone will give me some help in this matter. Right now I'm working for my diploma project - I'm doing a ELF loader for various operating systems/processors. While I found this to be simple on some processors/OSs, I have a rather strange problem on PowerPCs - I tried Both MacOS and various Linux distributions running on PPC. The problem is when I dynamically load code from a file I get random [at least IMO] signals [Illegal Instruction, Segmentation Fault, Bus Error] when executing the loaded code. I managed to write down a simple program that IMO should work - when I try it on my G3 it randomly crashes: #include <stdio.h> #include <sys/types.h> #include <sys/mman.h> #include <unistd.h> typedef void (*FUNCTYPE)(void); // this is the code I'm trying to run from a loaded block void foo(void) { int j = 0, i = 0; // just do some code i++; i--; for (i = 0; i < 100; i++) j += i; } // just to find out foo's code size void foo2() { } void *codealloc(int size) { void *m = mmap(NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0); return m; } int main() { int i, size = (int)(foo2-foo); unsigned char *c = (unsigned char*)codealloc(4096); FUNCTYPE fn; if (c == MAP_FAILED) return 1; if (c == 0) return 1; memcpy(c, foo, size); printf("copied %d bytes to %p\n", size, c); fn = (FUNCTYPE)c; // do some intensive calls for (i = 0; i < 10000; i++) { fn(); } printf("done calling fn!\n"); return 0; } Take a look at the results: [ibook:test] root# ./a.out copied 120 bytes to 0x84000 Illegal instruction [ibook:test] root# ./a.out copied 120 bytes to 0x84000 Illegal instruction [ibook:test] root# ./a.out copied 120 bytes to 0x84000 done calling fn! [ibook:test] root# ./a.out copied 120 bytes to 0x84000 Illegal instruction [ibook:test] root# ./a.out copied 120 bytes to 0x84000 done calling fn! I also tried this program on a PowerPC 701 and it works fine. Strange enough, when I put a sleep(1) before calling the function the stability of the program is increasing...but on heavy machine loads it also crashes. Is there something I'm doing wrong? Are there more flags for mmap needed? I compiled this with both cc/gcc, with and without -fPIC/-fpic. Any idea? Best regards, Adrian MARINESCU, RAV Development Team - http://www.rav.ro PGP Key : http://homepages.gecad.ro/mady/mady.asc Key ID : 1024/1F365951 Adrian MARINESCU <mady(a)gecad.ro> Key fingerprint = 0397 839F F8A6 E720 A49E 7D07 469C BB5C _______________________________________________ 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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Code loading and executing
by Adrian MARINESCU 10 May '02

10 May '02

Hi there! I'm not sure that this list is what I'm looking for, but maybe someone will give me some help in this matter. Right now I'm working for my diploma project - I'm doing a ELF loader for various operating systems/processors. While I found this to be simple on some processors/OSs, I have a rather strange problem on PowerPCs - I tried Both MacOS and various Linux distributions running on PPC. The problem is when I dynamically load code from a file I get random [at least IMO] signals [Illegal Instruction, Segmentation Fault, Bus Error] when executing the loaded code. I managed to write down a simple program that IMO should work - when I try it on my G3 it randomly crashes: #include <stdio.h> #include <sys/types.h> #include <sys/mman.h> #include <unistd.h> typedef void (*FUNCTYPE)(void); // this is the code I'm trying to run from a loaded block void foo(void) { int j = 0, i = 0; // just do some code i++; i--; for (i = 0; i < 100; i++) j += i; } // just to find out foo's code size void foo2() { } void *codealloc(int size) { void *m = mmap(NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0); return m; } int main() { int i, size = (int)(foo2-foo); unsigned char *c = (unsigned char*)codealloc(4096); FUNCTYPE fn; if (c == MAP_FAILED) return 1; if (c == 0) return 1; memcpy(c, foo, size); printf("copied %d bytes to %p\n", size, c); fn = (FUNCTYPE)c; // do some intensive calls for (i = 0; i < 10000; i++) { fn(); } printf("done calling fn!\n"); return 0; } Take a look at the results: [ibook:test] root# ./a.out copied 120 bytes to 0x84000 Illegal instruction [ibook:test] root# ./a.out copied 120 bytes to 0x84000 Illegal instruction [ibook:test] root# ./a.out copied 120 bytes to 0x84000 done calling fn! [ibook:test] root# ./a.out copied 120 bytes to 0x84000 Illegal instruction [ibook:test] root# ./a.out copied 120 bytes to 0x84000 done calling fn! I also tried this program on a PowerPC 701 and it works fine. Strange enough, when I put a sleep(1) before calling the function the stability of the program is increasing...but on heavy machine loads it also crashes. Is there something I'm doing wrong? Are there more flags for mmap needed? I compiled this with both cc/gcc, with and without -fPIC/-fpic. Any idea? Best regards, Adrian MARINESCU, RAV Development Team - http://www.rav.ro PGP Key : http://homepages.gecad.ro/mady/mady.asc Key ID : 1024/1F365951 Adrian MARINESCU <mady(a)gecad.ro> Key fingerprint = 0397 839F F8A6 E720 A49E 7D07 469C BB5C _______________________________________________ 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: Getting prefs to my driver (was: reading a file from kernel)
by Dean Reece 10 May '02

10 May '02

On Friday, May 10, 2002, at 06:55 AM, Sean McBride wrote: Dean Reece (dean.reece(a)apple.com) wrote: This mechanism is OK for use during development as a quick way to tweak driver settings. It is also OK for installation-time settings: Install the driver to /tmp; ask user questions; tweak plist accordingly; make plist read-only; move driver to /S/L/E. IMHO, even this is not so nice, because it makes the process of installation into something more than copying files. One thing that has always made the Mac better is that installation is nothing more than copying files (even if done by an installer program). I agree, and > 99.9% of the time, installing directly into /S/L/W will work fine. The problem is that we are using the filesystem as the database, and we don't have any way to know when the bundle has been copied over completely (or even an individual file for that matter). Even if you do hit the narrow window and have a partially copied driver attempt to load, the most likely failure case would be a failed load. I was offering the above advice to those folks who install/remove kexts from scripts or code. These steps aren't hard to follow, and completely eliminate the risk. As for users drag-copying drivers into the Extensions folder, give it a try. You'll discover that you need to be logged in as root to do so. Since enabling root is not something the casual user will stumble into, I'm not particularly worried about that loose end. - Dean _______________________________________________ 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: Getting prefs to my driver (was: reading a file from kernel)
by Sean McBride 10 May '02

10 May '02

Torsten Gatu (torsten.gatu(a)msab.com) wrote: >I'd like to have something like the Registry on WinNT You're joking, right? The Windows Registry is the cause of oh so many problems! I don't even know where to begin disagreeing. Seeing as Apple is planning something for allowing gettings prefs to a driver, it would be nice if they kept 'us' in the loop. _______________________________________________ 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: Getting prefs to my driver (was: reading a file from kernel)
by Sean McBride 10 May '02

10 May '02

Dean Reece (dean.reece(a)apple.com) wrote: >This mechanism is OK for use during development as a quick way to tweak >driver settings. It is also OK for installation-time settings: Install >the driver to /tmp; ask user questions; tweak plist accordingly; make >plist read-only; move driver to /S/L/E. IMHO, even this is not so nice, because it makes the process of installation into something more than copying files. One thing that has always made the Mac better is that installation is nothing more than copying files (even if done by an installer program). _______________________________________________ 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: Getting prefs to my driver (was: reading a file from kernel)
by Torsten Gatu 08 May '02

08 May '02

I'd like to have something like the Registry on WinNT (only faster); a tree structure with settings that are getable and setable from both user and kernelspace at any given time. OK, maybe I'm asking for a bit much here but our driver depends on information to be read or written at any time since our USB driver will not be loaded at boot-time. -----Original Message----- From: Shawn Erickson [mailto:shawn@freetimesw.com] Sent: den 7 maj 2002 17:11 To: darwin-kernel(a)lists.apple.com Cc: Torsten Gatu; Frode Isaksen Subject: Re: Getting prefs to my driver (was: reading a file from kernel) FYI... I was going to work on a generic framework for this as a project under OpenDarwin. I don't think it will be ready in the next couple of months but some day soon... Let me know of your requirements for such a beast (I have similar needs in drivers that I am writing but not on a per users basis). The following is from a project idea listing I sent to OpenDarwin hackers list... - Driver configuration information framework Provides a framework for the setting, getting and persistent storing of driver configuration information. The main setters would come from user mode applications/preference panels/installers and the getters would be in kernel component/drivers. A main requirement is the ability to get config information to drivers at boot time. Secondary requirements are the ability to store per user config information for those drivers that change depending on logged in user. Currently every driver vendor that needs driver configuration information has to implement their own method. This project would attempt to provide a standardized and tested way of doing what is needed. _______________________________________________ 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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