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***
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***
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From: <ben...@id...> - 2004-05-25 08:35:51
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Dear Open Source developer I am doing a research project on "Fun and Software Development" in which I kindly invite you to participate. You will find the online survey under http://fasd.ethz.ch/qsf/. The questionnaire consists of 53 questions and you will need about 15 minutes to complete it. With the FASD project (Fun and Software Development) we want to define the motivational significance of fun when software developers decide to engage in Open Source projects. What is special about our research project is that a similar survey is planned with software developers in commercial firms. This procedure allows the immediate comparison between the involved individuals and the conditions of production of these two development models. Thus we hope to obtain substantial new insights to the phenomenon of Open Source Development. With many thanks for your participation, Benno Luthiger PS: The results of the survey will be published under http://www.isu.unizh.ch/fuehrung/blprojects/FASD/. We have set up the mailing list fa...@we... for this study. Please see http://fasd.ethz.ch/qsf/mailinglist_en.html for registration to this mailing list. _______________________________________________________________________ Benno Luthiger Swiss Federal Institute of Technology Zurich 8092 Zurich Mail: benno.luthiger(at)id.ethz.ch _______________________________________________________________________ |
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From: Guido de J. <gu...@us...> - 2001-11-04 15:46:11
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I'll be away from nov. 6th through dec. 5th. During that period I'll have at best limited internet access, so I wont be able to contribute to the project. Guido |
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From: Guido de J. <gu...@us...> - 2001-10-09 20:04:29
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On Tuesday 09 October 2001 05:00, mohan kumar wrote: > hi guido, > what u say about debugging gemini first is correct. > i will try to provide more info. OK, thanks > BTW, > the values i get when i nm gemini-nucleus are, > 00109000 B io_port_bitmap > 00108080 B tss_system > > do they look correct or not? It is important that the (tss_system - io_port_bitmap) < 65535 (or maybe even 32767) but that is perfectly alright in your case. > iam trying to understand the nucleus code more > throughly. so at this point i am not able to say > weather they are correct or not :-( The values look fien to me. At each task switch the IO port bitmap of the process (io_pbm[0] and io_pbm[1]) are mapped at the address io_port_bitmap. This is done in function port_map_iopbm(). Maybe you could verify that this is done correctly on your machine. I'd probably best try to do the same here. Guido |
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From: mohan k. <moh...@ya...> - 2001-10-09 03:00:42
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hi guido, what u say about debugging gemini first is correct. i will try to provide more info. BTW, the values i get when i nm gemini-nucleus are, 00109000 B io_port_bitmap 00108080 B tss_system do they look correct or not? iam trying to understand the nucleus code more throughly. so at this point i am not able to say weather they are correct or not :-( Mohan S __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 |
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From: Guido de J. <gu...@us...> - 2001-10-08 17:33:48
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On Monday 08 October 2001 04:19, mohan kumar wrote: > --- Guido de Jong <gu...@us...> > > wrote: > >I meant the 2nd address: 0x07fd0008? > > oops... i was wrong... 2nd address sure is 0x00b8007 OK, good we cleared that up. > hi guido, > I have sorted out things here, and init is running!!! > But i sure still clearly dunno what was wrong, and > weather what i did is correct. > I embedded a few printf and tracked down that the gpf > was when we try to enable port 4, and preciesly when > we try to memset(line 53 in port.c) the port bit map, > it gpf's. That was to be expected. The memset line modifies the page containing the IO port bitmap. > I commented (without still knowing the piece of code's > importance :-P ) the memset and everything is working > fine. Now that you no longer try to modify the IO bitmap, you will not get the page fault. The problem is that you must change the IO port bitmap in order to get it working as it should. > can u help me to understand why its still working > after the memset was commented. I think that the IO port bitmap is overlapping some other region of memory. Can you run: nm -Cgn gemini-nucleus This will give you a symbol table. Please look up the values for tss_system and io_port_bitmap. > Now that i have got a bit of hand on the code, i will > start with the aposle code. (nucleus is ur headache as > of now, i suppose ;-) We need to fix this porblem with the nucleus before we can start doing something with the Apostle sources. Note that we probably require some redesign for that too. Guido |
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From: mohan k. <moh...@ya...> - 2001-10-08 02:19:33
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--- Guido de Jong <gu...@us...> wrote: >I meant the 2nd address: 0x07fd0008? oops... i was wrong... 2nd address sure is 0x00b8007 hi guido, I have sorted out things here, and init is running!!! But i sure still clearly dunno what was wrong, and weather what i did is correct. I embedded a few printf and tracked down that the gpf was when we try to enable port 4, and preciesly when we try to memset(line 53 in port.c) the port bit map, it gpf's. I commented (without still knowing the piece of code's importance :-P ) the memset and everything is working fine. can u help me to understand why its still working after the memset was commented. Now that i have got a bit of hand on the code, i will start with the aposle code. (nucleus is ur headache as of now, i suppose ;-) Mohan S __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 |
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From: Guido de J. <gu...@us...> - 2001-10-06 11:03:42
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On Saturday 06 October 2001 10:12, you wrote: > > > iam correct here... it is not 0x000b8007 but its > > > 0x07fda000 > > > > I meant the 2nd address: 0x07fd0008? > > sorry i typed the first address, but any way its > 0x07fd0008 and not 0x0000b8007 OK, that should be 0x000b8007. Maybe you can try to get some more info on this. > > What could happen is that the 1st sys_port_enable > > screws up some page > > tables. > > But I still don't think this has anything to do with > > > > the 0x000b80007 > > page. > > thats not my point... if the 0x000b80007 page is not > even set up then how come the sys_port_enable will be > able to enable it? The sys_port_enable tries to enable the IO ports 0x3d4 and 0x3d5. These ports give access to specific video card functions. This has nothing to do with page at 0xb8000, which is just where the video memory of the crt is mapped. Enabling ports is done by setting a bit to 0 in the IO bitmap. This bitmap has a fixed address in memory and at a process switch, the IO bitmap of the new process is mapped to that fixed address. Maybe on your machine this IO bitmap is overlapping with some other region. This should never occur, if so, this should be fixed ASAP. BTW I tried the Gemini Nucleus and demo initialiser process on my machines and I have no problems whatsoever. This means that I will have to go completely by the info you supply. I'll try to help as much as I can, but I'm afraid you will have to do most of the real work :-). Guido |
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From: mohan k. <moh...@ya...> - 2001-10-06 10:20:46
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hi guido, > > > setting entry 0 in page table 0x07fda000 to > 0x07fd0008 > Maybe you mistyped something here, 'cause the last > address should read > 0x000b8007. Please verify. > iam correct here... it is not 0x000b8007 but its 0x07fda000 i put an extra printf into the sys_port_enable function in the nucleus. it shows that only the first port (as coded in the init main.c... i dont remember the number now as iam mailing from my office. i will give the port number this evening.) is enabled. the second is NOT enabled. this is the exact point where i get the gpf. if every thing is correct i assume that two printf's in the sys_port_enable should happen, with the appropriate port numbers. but that dosent happen. so i think the port is not enabled. and the reson for that is the wrong entry where page table is set to 0(as in the begining of the mail). as this address is not pointed by the page table entries its throwing a page fault(cos' if the entry was 0x000b8007 as said by u... that would be a valid page table entry for the page fault address 0x000b8000). so, am i correct or i have got it all wrong ;-) also, i will give more info today evening. Mohan S __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 |
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From: mohan k. <moh...@ya...> - 2001-10-06 08:16:27
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> > > > iam correct here... it is not 0x000b8007 but its > > 0x07fda000 > > I meant the 2nd address: 0x07fd0008? > sorry i typed the first address, but any way its 0x07fd0008 and not 0x0000b8007 > > What could happen is that the 1st sys_port_enable > screws up some page > tables. > But I still don't think this has anything to do with > the 0x000b80007 > page. > thats not my point... if the 0x000b80007 page is not even set up then how come the sys_port_enable will be able to enable it? Mohan S __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 |
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From: Guido de J. <gu...@us...> - 2001-10-06 07:50:23
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On Saturday 06 October 2001 09:33, you wrote: > hi guido, > > > > setting entry 0 in page table 0x07fda000 to > > > > 0x07fd0008 > > Maybe you mistyped something here, 'cause the last > > address should read > > 0x000b8007. Please verify. > > iam correct here... it is not 0x000b8007 but its > 0x07fda000 I meant the 2nd address: 0x07fd0008? > i put an extra printf into the sys_port_enable > function in the nucleus. > > it shows that only the first port (as coded in the > init main.c... i dont remember the number now as iam > mailing from my office. i will give the port number > this evening.) is enabled. the second is NOT enabled. > this is the exact point where i get the gpf. > > if every thing is correct i assume that two printf's > in the sys_port_enable should happen, with the > appropriate port numbers. but that dosent happen. That is indeed what I would expect. > so i think the port is not enabled. and the reson for > that is the wrong entry where page table is set to > 0(as in the begining of the mail). > > as this address is not pointed by the page table > entries its throwing a page fault(cos' if the entry > was 0x000b8007 as said by u... that would be a valid > page table entry for the page fault address > 0x000b8000). What could happen is that the 1st sys_port_enable screws up some page tables. But I still don't think this has anything to do with the 0x000b80007 page. > so, am i correct or i have got it all wrong ;-) > also, i will give more info today evening. OK, more info is really needed. Guido |
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From: Guido de J. <gu...@us...> - 2001-10-06 07:38:12
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On Saturday 06 October 2001 09:23, Guido de Jong wrote: > > page fault 0x08000002 > > eip 0x00100806 > > address 0x0bff8000 > > The next thing that should happen is that the ports above are being > enabled. This is done setting 2 bits in the IO bitmap to 0. Apparently this > generates a page fault. Don't now why at the moment. Mohan, IIRC your machine had quite a lot of memory in it. Could you look up the values in the 'nm' output for tss_system and io_port_bitmap? The offset (size word!) to the io_port_bitmap is set into the tss_system, so they must not be too far apart. This could explain your problem. Guido |
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From: Guido de J. <gu...@us...> - 2001-10-06 07:18:09
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On Saturday 06 October 2001 04:32, you wrote: > hi guido, > i compiled the nucleus with MOREDEBUG defined. then i > saw the following message. (i typed it, so please dont > mind any tipos ;-) OK > .. > normal stuff > .. > Setting CPU upcalls to (0x10000018,0x10000024) for > process 512 > returning current process information > creating capablity > 1:(512,0x00007fdd,0x00000002,0x00000007) > creating capablity This creates a capability for the page directory, needed to change anything in the address space. What you see is: cap#:(PID,page#,cap-type,flags) > 2:(512,0x00000000,0x00000000,0x00000000) > creating capablity Acquire an empty page, the page number is not shown > 3:(512,0x000000b8,0x00000000,0x00000007) > creating capablity Create a capability for crt output, so it can write to the screen. > 2:(512,0x00007fda,0x00000002,0x00000007) > setting entry 400 in page directory 0x07fdd000 to > 0x07fd0007 This sets the empty page to entry 400 in the page dir. The empty page is now a page table. > setting entry 0 in page table 0x07fda000 to 0x07fd0008 Maybe you mistyped something here, 'cause the last address should read 0x000b8007. Please verify. > creating capablity > 4:(512,0x000003d4,0x00000004,0x00000001) > creating capablity > 5:(512,0x000003d5,0x00000002,0x00000001) This just creates capabilities to ports 0x3d4 and 0x3d5, needed to move the cursor and stuff like that. > page fault 0x08000002 > eip 0x00100806 > address 0x0bff8000 The next thing that should happen is that the ports above are being enabled. This is done setting 2 bits in the IO bitmap to 0. Apparently this generates a page fault. Don't now why at the moment. > my query is weather this address not lying in the page > table and directory entries u have made? This has nothing to do with the page that are created. You can use nm to find the function that is executed when the PF is generated. > i assume that the address is faulty (please correct me > here if iam wrong... i still dont have a hang on the > address space used ;-)...) and iam currently trying to > analyse what code is present in 0x00100806 and what > gave it a faulty page. Type 'nm -Cgn gemini-nucleus'. The output will help. > if iam taking a wrong approach, or if u have already > saw something of this kind tell me ;-) Your approach is fine, please keep us informed on anything you find out. I will look into it too in the meantime. Guido |
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From: mohan k. <moh...@ya...> - 2001-10-06 02:33:06
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hi guido, i compiled the nucleus with MOREDEBUG defined. then i saw the following message. (i typed it, so please dont mind any tipos ;-) .. normal stuff .. Setting CPU upcalls to (0x10000018,0x10000024) for process 512 returning current process information creating capablity 1:(512,0x00007fdd,0x00000002,0x00000007) creating capablity 2:(512,0x00000000,0x00000000,0x00000000) creating capablity 3:(512,0x000000b8,0x00000000,0x00000007) creating capablity 2:(512,0x00007fda,0x00000002,0x00000007) setting entry 400 in page directory 0x07fdd000 to 0x07fd0007 setting entry 0 in page table 0x07fda000 to 0x07fd0008 creating capablity 4:(512,0x000003d4,0x00000004,0x00000001) creating capablity 5:(512,0x000003d5,0x00000002,0x00000001) page fault 0x08000002 eip 0x00100806 address 0x0bff8000 my query is weather this address not lying in the page table and directory entries u have made? i assume that the address is faulty (please correct me here if iam wrong... i still dont have a hang on the address space used ;-)...) and iam currently trying to analyse what code is present in 0x00100806 and what gave it a faulty page. if iam taking a wrong approach, or if u have already saw something of this kind tell me ;-) Mohan S __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 |
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From: Guido de J. <gu...@us...> - 2001-10-02 19:23:33
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Since we got some people available again, I think this is a good time to start a bit of discussion on design. As I mentioned in a previous mail, I ran into some problems with the current design. If we extrapolate the current design we will end up of with probably hundreds of little servers, all dedicated to a very specific task. Although this would be very flexible, it will result in a load of overhead and it will be nearly impossible to manage. I think we need to group a number of processes or - maybe even better - build dynamic libraries that will be linked to certain processes. IMHO it is not a good idea to put everything into one big process (you could try to port the Linux kernel to the Gemini Nucleus if you wish, but I don't think that will gain you anything besides the fact that you proved it can be done). Anyway, we really have to do things differently, but I'm not sure how. I hope some of you could post your ideas on this. It doesn't matter if your ideas are vague or even impossible. As long as it helps to get the discussion going! Guido |
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