http://etherboot.org/wiki/ 2026-06-22T15:29:49-07:00 http://etherboot.org/wiki/ http://etherboot.org/wiki/lib/tpl/monobook/images/favicon.ico text/html 2010-06-01T11:23:22-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/start?rev=1275416602&do=diff Piotr Jaroszyński: Usermode debugging under Linux Journal * Previous work|Prior to 24 May 2010 * Week 1 [ May 24 - May 30 ] * Week 2 [ May 31 - Jun 6 ] * Week 3 [ Jun 7 - Jun 13 ] * Week 4 [ Jun 14 - Jun 20 ] * Week 5 [ Jun 21 - Jun 27 ] * Week 6 [ Jun 28 - Jul 4 ] * Week 7 [ Jul 5 - Jul 11 ] * Week 8 [ Jul 12 - Jul 18 ] * Week 9 [ Jul 19 - Jul 25 ] * Week 10 [ Jul 26 - Aug 1 ] * Week 11 [ Aug 2 - Aug 8 ] * Week 12 [ Aug 9 - Aug 15 ] text/html 2010-06-01T11:26:15-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week0?rev=1275416775&do=diff Piotr Jaroszyński: Usermode debugging under Linux Previous work [ Prior to 24 May 2010 ] Unrelated work Before I even started thinking about a proposal for my project I decided to do some pretty much random unrelated work to get a better feeling of gPXE in general. This resulted in a few trivial patches: text/html 2010-06-05T16:40:54-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week1?rev=1275781254&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 1 [ 24 May - 30 May 2010 ] Monday, 24 May 2010 * Refreshed my gPXE memory a little * Had a meeting with Josh: * Went over my previous work * Decided upon the tasks for the nearest and more distant future text/html 2010-06-10T12:28:45-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week2?rev=1276198125&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 2 [ 31 May - 6 Jun 2010 ] Cleanup and command line options I have pretty much finished the cleanup and also added command line options. Multiple commits in the linux branch, but especially: * [linux] Add device, drivers and initialization logic text/html 2010-06-14T16:26:41-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week3?rev=1276558001&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 3 [ 7 Jun - 13 Jun 2010 ] Getting rid of the stdlib dep I have finished the stdlib-free implementation. It's available on the linux branch. Most of the new stuff is in these commits: * [linux] Add linuxprefix text/html 2010-07-01T13:50:48-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week4?rev=1278017448&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 4 [ 14 Jun - 20 Jun 2010 ] Wiki Added/updated: * Being self-contained (libc-free) valgrind I have started working on valgrind. See week 6 for report. text/html 2010-07-01T13:50:04-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week5?rev=1278017404&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 5 [ Jun 21 - Jun 27 2010 ] Although I have managed to do some work during the week I have been mostly busy at uni so I will call this week the slackweek and leave it at that. See next week for work report. text/html 2010-07-01T13:41:09-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week6?rev=1278016869&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 6 [ Jun 28 - Jul 4 2010 ] In the spirit of not building up the journal slackpile even more I will try to keep it up-to-date since now and work on the past in the meantime. valgrind The last 2 weeks (including a break for exams at uni) I have been working on making the usermode gPXE valgrindable. You may ask what's there to do as valgrind usually works out of the box for most applications. And that's a very good question, the thing is t… text/html 2010-07-06T09:14:33-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week7?rev=1278432873&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 7 [ Jul 5 - Jul 11 2010 ] drivers in userspace After a lot of reading and trial and error I have managed to come up with a working, but awfully hacky proof of concept: # ./pcnet32.linuxlibc gPXE initialising devices... gPXE 1.0.1+ -- Open Source Boot Firmware -- http://etherboot.org Features: HTTP DNS TFTP DHCP (net0 52:54:00:12:34:58).... ok http://root.piotrj.org/files/gpxe/1mb. ok text/html 2010-07-14T11:52:28-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week8?rev=1279133548&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 8 [ Jul 12 - Jul 18 2010 ] valgrind I wasn't supposed to work on valgrind related stuff, but the following report keeps nagging me: ==31509== 360 bytes in 1 blocks are still reachable in loss record 4 of 5 ==31509== at 0x402C2E: realloc (malloc.c:316) ==31509== by 0x402DCE: malloc (malloc.c:351) ==31509== by 0x402DDC: zalloc (malloc.c:382) ==31509== by 0x404FF8: alloc_netdev (netdevice.c:329) ==31509== by 0x404185: alloc… text/html 2010-08-08T07:58:02-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week9?rev=1281279482&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 9 [ Jul 19 - Jul 25 2010 ] drivers in userspace I have just pushed my drivers in userspace branch. It's still a bit rough but it gets the job done. See next week's report for an issue that particularly bugs me. Before getting into details of the implementation let's see a quick HOWTO first: text/html 2010-07-31T15:13:02-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week10?rev=1280614382&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 10 [ Jul 26 - Aug 1 2010 ] drivers in userspace The big issue There is one thing that keeps bugging me in the drivers branch - UIO-DMA and malloc. UIO-DMA does the DMA mappings on a per device basis (as does kernel). I am not sure whether the mappings are really per device or global, but the text/html 2010-08-08T07:04:31-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week11?rev=1281276271&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 11 [ Aug 2 - Aug 8 2010 ] drivers in userspace Addressing spaces First a bit of background. There are four different kind of addresses in gPXE: * virtual - these are the ones you can access directly in gPXE via normal pointer derefence text/html 2010-08-12T08:25:13-07:00 http://etherboot.org/wiki/soc/2010/peper/journal/week12?rev=1281626713&do=diff Piotr Jaroszyński: Usermode debugging under Linux Week 12 [ Aug 9 - Aug 15 2010 ] drivers in userspace Josh did a thorough review of the drivers branch, thanks Josh! Apart from smaller things the two bigger issues were: * Implementing bus_to_phys() as some drivers do need it (mostly indirectly via bus_to_virt())