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* [TUHS] CMU Mach sources?
@ 2019-06-23  4:38 Chris Hanson
  2019-06-23  5:15 ` Larry McVoy
                   ` (4 more replies)
  0 siblings, 5 replies; 55+ messages in thread
From: Chris Hanson @ 2019-06-23  4:38 UTC (permalink / raw)
  To: tuhs

Does anyone know whether CMU’s local Mach sources have been preserved?

I’m not just talking about MK84.default.tar.Z  and so on, I’m talking about all the bits of Mach that were used on cluster systems on campus, prior to the switch to vendor UNIX.

I know at least one person who had complete MacMach sources for the last version, but threw out the backup discs with the sources in the process of moving. So I know they exist.

If nothing else, CMU did provide other sites their UX source package (eg UX42), which was the BSD single server environment. So I know that has to be out there, somewhere.

  — Chris

Sent from my iPhone

^ permalink raw reply	[flat|nested] 55+ messages in thread
* Re: [TUHS] CMU Mach sources?
@ 2019-06-23 22:08 Noel Chiappa
  2019-06-23 23:54 ` Theodore Ts'o
  0 siblings, 1 reply; 55+ messages in thread
From: Noel Chiappa @ 2019-06-23 22:08 UTC (permalink / raw)
  To: tuhs; +Cc: jnc

    > From: Andrew Warkentin

    > Mach and the other kernels influenced by it basically destroyed the
    > reputation of microkernels ...  a simple read() of a disk file, which is
    > a single kernel call on a monolithic kernel and usually two context
    > switches on QNX, takes at least 8 context switches - client->VFS->disk
    > FS->partition driver->disk driver and back again).

Hammer-nail syndrome.

When the only tool you have for creating separate subsystems is processes, you
wind up with a lot of processes. Who'd a thunk it.

A system with a segmented memory which allows subroutine calls from one subsystem
to another will have a lot less overhead. It does take hardware support to be
really efficient, though. The x86 processors had that support, until Intel dropped
it from the latest ones because nobody used it.

Excuse me while I go bang my head on a very hard wall until the pain stops.

       Noel


^ permalink raw reply	[flat|nested] 55+ messages in thread
* [TUHS] CMU Mach sources?
@ 2019-07-01 13:20 Jason Stevens
  0 siblings, 0 replies; 55+ messages in thread
From: Jason Stevens @ 2019-07-01 13:20 UTC (permalink / raw)
  To: The Eunuchs Hysterical Society

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I finally got a chance to talk to someone who knows a hell of a lot about the i386 than I could ever hope to know.  I gave him all the materials and I think he spent more time replying to my email than doing the debugging. 




Basically the registers for entering protected mode with paging are backwards.  This is kind of funny as the port was done by Intel of all people. 




Anyway I reversed them and I now have the Mach kernel from 1988 booted under VMware. 




I have to say that it's super cool to finally have chased this one down. 



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^ permalink raw reply	[flat|nested] 55+ messages in thread

end of thread, other threads:[~2019-07-01 13:20 UTC | newest]

Thread overview: 55+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-23  4:38 [TUHS] CMU Mach sources? Chris Hanson
2019-06-23  5:15 ` Larry McVoy
2019-06-23  8:52   ` Andrew Warkentin
2019-06-23 13:39   ` Jon Forrest
2019-06-23 13:59     ` arnold
2019-06-23 14:03     ` Jason Stevens
2019-06-23  8:04 ` Jason Stevens
2019-06-23 14:54   ` Henry Bent
2019-06-23 21:52     ` Clem Cole
2019-06-25  0:06       ` Larry McVoy
2019-06-25  0:31         ` Theodore Ts'o
2019-06-25  0:45           ` Larry McVoy
2019-06-25  0:55             ` Kurt H Maier
2019-06-25  4:18               ` Larry McVoy
2019-06-26 23:19                 ` [TUHS] Craft vs Research (Re: " Bakul Shah
2019-06-27  0:16                   ` tuhs
2019-06-27 17:06                     ` Clem Cole
2019-06-25  1:00             ` [TUHS] " Richard Salz
2019-06-25  8:00               ` Kevin Bowling
2019-06-25 12:11                 ` Arthur Krewat
2019-06-25 12:17                   ` Arthur Krewat
2019-06-26  2:45               ` Kurt H Maier
2019-06-26  2:56                 ` Larry McVoy
2019-06-26 15:11                   ` Theodore Ts'o
2019-06-26 17:44                     ` Larry McVoy
2019-06-26 18:01                       ` arnold
2019-06-26 18:18                         ` Warner Losh
2019-06-26 19:22                       ` Chris Hanson
2019-06-26 19:32                         ` Ben Greenfield via TUHS
2019-06-26 20:21                           ` Larry McVoy
2019-06-27  0:22                             ` Chris Hanson
2019-06-27  1:02                               ` Larry McVoy
2019-06-27  1:26                                 ` Chris Hanson
2019-06-27  4:01                             ` Lyndon Nerenberg
2019-06-27 10:34                               ` Ben Greenfield via TUHS
2019-06-27 10:59                                 ` arnold
2019-06-27 11:13                                   ` Ben Greenfield via TUHS
2019-06-27 11:39                                     ` arnold
2019-06-27 14:58                                     ` Warner Losh
2019-06-27 17:25                                       ` Larry McVoy
2019-06-26 19:30                       ` Dennis Boone
2019-06-26 19:25                     ` Adam Thornton
2019-06-23  8:27 ` Kevin Bowling
2019-06-25  3:07 ` Gregg Levine
2019-06-25  8:15   ` Kevin Bowling
2019-06-25 18:18   ` Chris Hanson
2019-06-25 20:23     ` Gregg Levine
2019-06-26  1:04       ` Jason Stevens
2019-06-26  0:53     ` Jason Stevens
2019-06-25  7:49 ` Jason Stevens
2019-06-25  7:59   ` Andreas Grapentin
2019-06-23 22:08 Noel Chiappa
2019-06-23 23:54 ` Theodore Ts'o
2019-06-24 17:04   ` Jason Stevens
2019-07-01 13:20 Jason Stevens

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