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Michael Zucchi

 B.E. (Comp. Sys. Eng.)

  also known as zed
  & handle of notzed

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Monday, 18 May 2009, 13:12

The devel's in the details

Well the last post was written before the weekend, and it's been a long snotty weekend since then. I've become a little obsessed with it lately although I found a couple of hours to fix a sticking door.

I spent the rest of the weekend glued to the screen hacking away feverishly - although I'm getting stuck doing more support code than anything else.

Before one of the more major re-orgs I burnt the iso image to a dvd and loaded it up on an old pc. As much as bochs and qemu are handy, it was quite inspiring to see it work on real hardware even if it didn't do much.

Although they're not particularly efficient, i'm thinking of using taglists a lot for many of the interfaces - anywhere where you might need to extend functionality. At least on x86 32 bit they are very simple. If a syscall is required, the user-level code will then marshal the taglist into a more compact private structure and invoke the system handler. This would let it perform some validation checks too although the supervisor code will probably still have to do the same to avoid malicious code; which is an expensive pita. Maybe I can let the 'kernel' crash in this case and just throw away the calling task 'safely' instead - let the hardware do the checking.

I guess i'll be stuck doing some of this housekeeping work for a while, and then I can get back to trying to get a device going, or something else more 'interesting'.

Tagged hacking, os.
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