Alexander Leidinger

Just another weblog

May
18

linux_base-c6

Seems I for­got to announce that the linux_base-c6 is in the Ports Col­lec­tion now. Well, it is not a replace­ment for the cur­rent default linux base, the lin­ux­u­la­tor infra­struc­ture ports are miss­ing and we need to check if the ker­nel sup­ports enough of 2.6.18 that noth­ing breaks.

TODO:

To my knowl­edge, nobody is work­ing on any­thing of this. Any­one is wel­come to have a look and pro­vide patches.

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Mar
13

New oppor­tu­ni­ties in the linuxulator

Last week­end I com­mit­ted some dummy-syscalls to the lin­ux­u­la­tor in FreeBSD-cur­rent. I also added some com­ments to syscalls.master which should give a hint which linux ker­nel had them for the first time (if the linux man–page I looked this up in is cor­rect). So if some­one wants to exper­i­ment with a higher compat.linux.osrelease than 2.6.16 (as it is needed for a Cen­tOS based linux_base), he should now get some ker­nel mes­sages about unim­ple­mented syscalls instead of a silent failure.

There may be some low-hanging fruits in there, but I did not really ver­ify this by check­ing what the dummy syscalls are sup­posed to do in linux and if we can eas­ily map this to exist­ing FreeBSD fea­tures. In case some­one has a look, please send an email to emu­la­tion@FreeBSD.org.

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Mar
13

New Cen­tOS linux_base for test­ing soonish

It seems my HOWTO cre­ate a new linux_base port was not too bad. There is now a PR for a Cen­tOS 6 based linux_base port. I had a quick look at it and it seems that it is nearly usable to include into the Ports Col­lec­tion (the SRPMs need to be added, but that can be done within some minutes).

When FreeBSD 8.3 is released and the Ports Col­lec­tion open for sweep­ing com­mits again, I will ask port­mgr to do a repo-copy for the new port and com­mit it. This is just the linux_base port, not the com­plete infra­struc­ture which is needed to com­pletely replace the cur­rent default lin­ux­u­la­tor user­land. This is just a start. The process of switch­ing to a more recent linux_base port is a long process, and in this case depends upon enough sup­port in the sup­ported FreeBSD releases.

Atten­tion: Any­one installing the port from the PR should be aware that using it is a highly exper­i­men­tal task. You need to change the lin­ux­u­la­tor to imper­son­ate him­self as a linux 2.6.18 ker­nel (described in the pkg-message of the port), and the code in FreeBSD is far from sup­port­ing this. Any­one who wants to try it is wel­come, but you have to run FreeBSD-current as of at least the last week­end, and watch out for ker­nel mes­sages about unsup­ported syscalls. Reports to emulation@FreeBSD.org please, not here on the webpage.

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May
04

Video4Linux2 sup­port in FreeBSD (linuxulator)

I com­mit­ted the v4l2 sup­port into the lin­ux­u­la­tor (in 9–cur­rent). Part of this was the import of the v4l2 header from linux. We have the per­mis­sion to use it (like the v4l one), it is not licensed via GPL. This means we can use it in FreeBSD native dri­vers, and they are even allowed to be com­piled into GENERIC (but I doubt we have a dri­ver which could pro­vide the v4l2 inter­face in GENERIC).

The code I com­mit­ted is “just” the glue-code which allows to use FreeBSD native devices which pro­vide a v4l2 inter­face (e.g. multimedia/pwcbsd or multimedia/webcamd) from linux pro­grams.

Thanks to nox@ for writ­ing the glue code.

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Jul
29

v4l sup­port in the lin­ux­u­la­tor MFCed to 8-stable

I merged the v4l trans­la­tion layer into the lin­ux­u­la­tor of 8-stable. As in -cur­rent, this just means that linux apps (like Skype) can now use FreeBSD native devices which con­form to the v4l ABI. The port mul­ti­me­dia/webcamd pro­vides access to some web­cams (or DVB hard­ware) via the v4l ABI.

Peo­ple which want to test the lin­ux­u­la­tor part should first make sure a native FreeBSD appli­ca­tion has no prob­lem access­ing the device.

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