Messages in this thread | | | Date | Tue, 07 Nov 2000 16:59:34 -0700 | From | "Jeff V. Merkey" <> | Subject | Re: Installing kernel 2.4 |
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"Jeff V. Merkey" wrote: > > "Jeff V. Merkey" wrote: > > > > davej@suse.de wrote: > > > > > > > There are tests for all this in the feature flags for intel and > > > > non-intel CPUs like AMD -- including MTRR settings. All of this could > > > > be dynamic. Here's some code that does this, and it's similiar to > > > > NetWare. It detexts CPU type, feature flags, special instructions, > > > > etc. All of this on x86 could be dynamically detected. > > > > > > Detecting the CPU isn't the issue (we already do all this), it's what to > > > do when you've figured out what the CPU is. Show me code that can > > > dynamically adjust the alignment of the routines/variables/structs > > > dependant upon cacheline size. > > ftp.timpanogas.org/manos/manos0817.tar.gz > > Look in the PE loader -- Microsoft's PE loader can do this since > everything is RVA based. If you want to take the loader and put it in > Linux, be my guest. You can even combine mutiple i86 segments all > compiled under different options (or architectures) and bundle them into > a single executable file -- not somthing gcc can do today -- even with > DLL. This code is almost identical to the PE loader used in NT -- with > one exception, I omit the fs:_THREAD_DLS startup code... > > 8) > > Jeff > > > > > If the compiler always aligned all functions and data on 16 byte > > boundries (NetWare) > > for all i386 code, it would run a lot faster. Cache line alignment > > could be an option in the loader .... after all, it's hte loader that > > locates data in memory. If Linux were PE based, relocation logic would > > be a snap with this model (like NT).
Also, init.386 has an x86 real mode PE loader as well that could easily be used to load Linux as a DLL instead of a coff binary. Then you could combine several executable segments of differing optimizations and select the correct one at load time. I do this now. It's pretty easy to do with PE ...
Jeff
> > > > Jeff > > > > > > > > regards, > > > > > > Davej. > > > > > > -- > > > | Dave Jones <davej@suse.de> http://www.suse.de/~davej > > > | SuSE Labs > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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