Quoting Ali Saidi <[email protected]>: > > On Tue, 9 Jun 2009 08:30:40 -0700, nathan binkert <[email protected]> wrote: >>> These patches touch up our ARM implementation and add in support for > some >>> new >>> features including TLS, a page for the "kernel" to install user level >>> helper >>> functions, a few of those functions, and hooking in mmap2. With these >>> patches, >>> I can run a new hello world I compiled which will become ARM's first >>> regression test. >>> >>> I wanted to send these out for review mainly because of the user level >>> helper >>> page/functions. I'm mostly guessing how this page (pages?) is (are) >>> supposed to >>> work, and I'm even guessing at what the right name is. The name I'm >>> using, >>> comm page, came from a post about valgrind and may be totally > inaccurate. >>> Also, the functions I implemented are paraphrased from the Linux kernel. >>> Please let me know if there are any copyright concerns. They're > generally >>> very >>> short, but the one for cmpxchg is a little longer. My version is dumbed >>> down >>> because some of the needed instructions aren't supported, so that >>> specific one >>> isn't copied verbatim. >> If you're talking about the short blobs of hex strings, it's no big >> deal. Those are very short. >> >> Out of curiosity, what are these blobs for? Are they a microcode thing? > They support certain features where their may not be a workable > implementation on the hardware (this is generally the case for older ARM > systems without coherence). For example one implements a compare/exchange > in a system without (ll/sc, swap, etc) by having a system call do it. In > the UP case as long as the kernel won't interrupt it's private routine for > a context switch this works fine. I don't know why the TLS one exists, but > it provide a way to store and retrieve the per-thread TLS pointer in > syscall form. > > I actually had a much uglier hack in a private tree that did this, so I > approve of Gabe's patches. Although, when I compiled hello world all the > syscalls tried to use ID 0 (indirect syscall) and I don't see an > implementation for that. > > Ali > _______________________________________________ > m5-dev mailing list > [email protected] > http://m5sim.org/mailman/listinfo/m5-dev >
Do you know what the right name is for that region? I'm very suspicious of the name I picked. Gabe _______________________________________________ m5-dev mailing list [email protected] http://m5sim.org/mailman/listinfo/m5-dev
