Hybrid (micro)kernels

By: rwessel (robertwessel.delete@this.yahoo.com), May 16, 2006 11:23 am
Room: Moderated Discussions
Rob Thorpe (robert.thorpe@antenova.com) on 5/16/06 wrote:
---------------------------
>You could do something like this:
>
>* Have a kernel containing the most essential things, scheduler, start-up etc.
>* Have a small compiler hooked to the kernel capable of compiling from some simple
>intermediate language into machine code. (Maybe it need not be in the kernel)
>* Have less core things, like device drivers, and file systems held in intermediate code.
>
>When a sub-system is needed it is compiled. To compile it there is a function something like
>
>compiler (code_block, allowable_mem_accesses, allowable_io, etc);
>
>I.e. the compiler takes as argument what memory and IO the code is permitted to
>access. It then compiles the code with those limits. Anything it statically verifies
>are inside the limits is compiled directly, for anything it can't it inserts checks.
>
>The compilation could be done for device drivers etc when their memory spaces are
>known. Which may be boot time or build time or some other time later.
>
>
>This seems a complex way to go about the problem, the compiler would have to be
>good. But there again most kernels are fairly complex anyway.


I can see it now... Device drivers written in Java... ;-)

But seriously, that seems like overkill. Any trustworthy compiler for a type-safe language will do the trick. They just have to accept (well typed) pointers to the objects they reference. And I/O ports are mostly ignorable - since essentially nothing that's performance critical uses them, you can provide access though an (checked) API (at least on platforms that actually support I/O port instructions - implementations that fake PCI ports with memory mappings are obviously in the original scenario).

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TopicPosted ByDate
Hybrid (micro)kernelsTzvetan Mikov2006/05/08 04:41 PM
  Hybrid (micro)kernelsS. Rao2006/05/08 06:14 PM
  Hybrid (micro)kernelsBill Todd2006/05/08 06:16 PM
    Hybrid (micro)kernelsTzvetan Mikov2006/05/08 07:21 PM
      Hybrid (micro)kernelsnick2006/05/08 07:50 PM
      Hybrid (micro)kernelsBill Todd2006/05/09 01:26 AM
        There aren't enough words...Rob Thorpe2006/05/09 02:39 AM
          There aren't enough words...Tzvetan Mikov2006/05/09 03:10 PM
            There aren't enough words...Rob Thorpe2006/05/15 12:25 AM
        Hybrid (micro)kernelsTzvetan Mikov2006/05/09 11:17 AM
          Hybrid (micro)kernelsBill Todd2006/05/09 04:05 PM
  Hybrid (micro)kernelsrwessel2006/05/08 11:23 PM
    Hybrid kernel, not NTRichard Urich2006/05/09 06:03 AM
      Hybrid kernel, not NT_Arthur2006/05/09 07:06 AM
        Hybrid kernel, not NTRob Thorpe2006/05/09 07:40 AM
          Hybrid kernel, not NT_Arthur2006/05/09 08:30 AM
            Hybrid kernel, not NTRob Thorpe2006/05/09 09:07 AM
              Hybrid kernel, not NT_Arthur2006/05/09 09:36 AM
                Linux vs MacOSX peformance, debunked_Arthur2006/05/18 07:30 AM
                  Linux vs MacOSX peformance, debunkedRob Thorpe2006/05/18 08:19 AM
                    Linux vs MacOSX peformance, debunkedAnonymous2006/05/18 12:31 PM
        Hybrid kernel, not NTLinus Torvalds2006/05/09 08:16 AM
          Hybrid kernel, not NTAndi Kleen2006/05/09 02:32 PM
            Hybrid kernel, not NTmyself2006/05/09 03:24 PM
              Hybrid kernel, not NTmyself2006/05/09 03:41 PM
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                  Hybrid kernel, not NTBrendan2006/05/13 01:35 AM
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                                Hybrid kernel, not NTnick2006/05/14 11:46 PM
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                                    Hybrid kernel, not NTrwessel2006/05/15 07:21 AM
                                      Hybrid kernel, not NTBrendan2006/05/15 08:55 AM
                                        Hybrid kernel, not NTLinus Torvalds2006/05/15 09:49 AM
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                                          Hybrid kernel, not NTtony roth2008/01/31 02:20 PM
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                  Hybrid kernel, not NTAnonymous2008/05/01 10:31 PM
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                      Following the structure of the treeDean Kent2008/05/02 05:31 AM
                        Following the structure of the treeMichael S2008/05/02 06:02 AM
                        Following the structure of the treeDavid W. Hess2008/05/02 06:48 AM
                          Following the structure of the treeDean Kent2008/05/02 09:14 AM
                            Following the structure of the treeDavid W. Hess2008/05/02 10:05 AM
                              LOL!Dean Kent2008/05/02 10:33 AM
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                                Following the structure of the treeDean Kent2008/05/02 07:52 PM
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                                  Following the structure of the treeDavid W. Hess2008/05/03 06:54 AM
                                    Following the structure of the treeDean Kent2008/05/03 10:06 AM
                                      Following the structure of the treeFoo_2008/05/04 01:06 AM
                                        Following the structure of the treeMichael S2008/05/04 01:22 AM
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          Hybrid kernel, not NTAnalGuy2006/05/16 03:10 AM
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              Theory versus practiceHoward Chu2006/05/17 02:54 AM
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        Hybrid (micro)kernelsRob Thorpe2006/05/16 01:22 AM
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    Hybrid (micro)kernelsRob Thorpe2006/05/22 08:35 AM
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