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Topic: Mach kernel

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In the News (Sun 19 Nov 17)

 [No title]
Mach is an example of an object-oriented system where the data and the operations that manipulate that data are encapsulated into an abstract object.
Mach ports can be transferred only in messages, and messages must be sent to ports; the promitive name service solves the problem of transferring the first port that allows tasks on different computers to exchange messages.
The designers of Mach therefore provide an interface that takes as input a definition of the interface to be used (declaration of variables, types and procedures), and generates the RPC interface code needed tosend and receive the messages fitting this definition and to connect the messages to the sending and receiving threads.
library.nocrew.org /lib/os/Mach.txt   (10104 words)

  Mach kernel - Wikipedia, the free encyclopedia
Mach is the logical successor to Carnegie Mellon's Accent kernel.
Mach received a major boost in visibility when the Open Software Foundation (OSF) announced they would be hosting future versions of OSF/1 on Mach 2.5, and were investigating Mach 3 as well.
Mach 3 led to a number of efforts to port other operating systems to the kernel, including IBM's Workplace OS and several efforts by Apple Computer to build a cross-platform version of the Mac OS.
en.wikipedia.org /wiki/Mach_kernel   (3928 words)

 Mach - Wikipedia, the free encyclopedia
GNU Mach The microkernel on which GNU Hurd is based
Mach kernel, an operating systems kernel technology used in Mac OS X
Mach Five, the name of the car in the animated TV series Speed Racer
en.wikipedia.org /wiki/Mach   (119 words)

 What's with all these MkLinux Kernels?   (Site not responding. Last check: 2007-10-18)
MACH KERNEL: Corrects the support for the PB1400 expansion bay switch (-e), fixing crash on PB5300's in the process (it was half on, half off, with either setting).
MACH KERNEL: fix for underlying cause of jiffies_thread crashes, adds a patch to more crash with large memory from the mach kernel into the linux server.
Mach Kernel: This is believed to include working support for left expansion bay IDE devices in the PowerBook G3 series.
globegate.utm.edu /MkLinux   (1267 words)

 Guide to Porting Mach
That is selecting which components of Mach are to go into a particular kernel, which device drivers to incorporate, their hardware address, and to set kernel configuration parameters such as the number of psuedo-terminals.
A kernel is specified using a set of attributes, these attributes are used to select a set of options, which in turn are used to select the files to use in building the kernel.
A Mach kernel is built by specifying the desired set of attributes the kernel is to have.
www.base.com /gordoni/mach-port-guide.html   (2306 words)

 Initial Investigation of Mach and Chorus
Originally the Bsd kernel was written for the VAX architecture and it was only after it was written that an attempt was made to split it up into machine dependent and machine independent parts.
To the Chorus kernel, operating system actors appears no differently than any other actors, and so it is possible to have multiple operating systems running at once, or to dynamically reconfigure an operating system, by say migrating the port associated with a particular operating system function.
Mach and Chorus will now be compared from the viewpoint of assessing the amount of effort required to port them to the Mars and Leopard-2 computers.
www.base.com /gordoni/mach-v-chorus.html   (6893 words)

 [No title]
MACH is currently supported at CMU on the DEC VAX 8650, 8600, 11/785, 11/780, 11/750 and MicroVAX II, the IBM RT/PC and the SUN 3.
This kernel state can not be modified by thread_set_state with the result that when the thread is resumed the system call may return changing the user state and possibly user memory.
To enhance performance, a memory manager may allow a MACH kernel to maintain its memory cache for a memory object after all virtual address space references to it are gone, by asserting the caching parameter to the memory_object_set_attributes call.
ftp.digital.com /pub/Mach/doc/manual.doc   (16568 words)

 Mach Kernel Interface Reference Manual
Mach IPC presents itself in a few forms: message queues, lock-sets, and semaphores (more may be added in the future).
All share one common charateristic: the capabilities presented by each are represented through a handle known as a Mach port.
Specific rights represented in these Mach port capability handles allow the underlying IPC object to be used and manipulated in consistent ways.
web.mit.edu /darwin/src/modules/xnu/osfmk/man   (1948 words)

 Mach kernel
Mach was a project at the Carnegie-Mellon University that started in 1985 and ended October 1994.
While there is still some work being done at CMU, today most development and support on the Mach Kernel is done elsewhere.
Additional information about the Mach Kernel can be found at the Mach Project home page.
www.computerhope.com /jargon/m/machkern.htm   (63 words)

 Is Mach to blame for OS X's slowness? - MacNN Forums
The BSD kernel and the Mach kernel are compiled into the same binary (/mach_kernel) and share the same address space.
The Mach that is in OS X is a bit of a hybrid, as it incorporates some elements that were seperate from the kernel in the past.
A microkernel isn't slower nor is a monolithic kernel that unmodular.
forums.macnn.com /showthread.php?t=124939   (2832 words)

 The Mach 4 Project
Note: the Mach 4 Project is no longer active at Utah, however Mach4 is alive and well as part of the xMach project.
The goal of the Mach 4 project is to investigate some new research ideas, fix the major problems of Mach 3, and provide the base needed by the Flux project, ending up with a fast, flexible, functional kernel worthy of being called Mach version 4.
Mach can be compiled using native build tools on Linux, BSD, Mach+UX, and Mach+Lites, and can be cross-compiled from any environment on which you can build the necessary GNU cross-development tools.
www.cs.utah.edu /flux/mach4/html/Mach4-proj.html   (768 words)

 OSF Kernel and Server programming manuals.   (Site not responding. Last check: 2007-10-18)
They all document Mach 3.0, but in the case of the Kernel Principles manual and the Server Writer's Guide much of the information is applicable to Mach 2.5.
It is currently the best detailed introductio\ n to the basic Mach concepts: tasks, threads, ports, messages, memory objects, virtual address spaces, processors, hosts and devices.
Similar to the Mach 2.5 documents, "MIG - The MACH Interface Generator", Draves, et.al.
www.cs.cmu.edu /afs/cs/project/mach/public/www/doc/osf.html   (202 words)

 Kernelthread :: View topic - Mach kernel obsolete?
While the original CMU Mach Project was ended in 1994 with Mach 3, University of Utah has picked up the project and released Mach 4 in 1998.
As I have pointed out elsewhere several times, Mach, even though designed and initially presented to be a "microkernel" (large parts of erstwhile in-kernel functionality residing as user-level servers), it was never really commercially used as one.
Mach was designed to be multithreaded and multiprocessor-ready, unlike the prevailing systems of that time.
www.kernelthread.com /forums/viewtopic.php?t=129&highlight=microkernel   (1888 words)

 CMU CS Project Mach Home Page
Project Mach was an operating systems research project of the Carnegie Mellon University School of Computer Science from 1985 to 1994.
Mach publications, manuals, examples, tutorials, and installation references.
Unlicensed sources and binaries for code distributed by the Mach project.
www-2.cs.cmu.edu /afs/cs/project/mach/public/www/mach.html   (118 words)

 The GNU Hurd - GNU Project - Free Software Foundation (FSF)
The Hurd is a collection of servers that run on the Mach microkernel to implement file systems, network protocols, file access control, and other features that are implemented by the Unix kernel or similar kernels (such as Linux).
For all intents and purposes, the Hurd is a modern Unix-like kernel.
The mechanism for kernel extensions is secure by design: it is impossible to impose your changes upon other users unless they authorize them or you are the system administrator.
www.gnu.org /software/hurd/hurd.html   (674 words)

 MkLinux: Developer Corner: Mach Kernel FAQ
To release the Mach Kernel under GPL would violate the Berkeley-style license agreement used in the majority of the Mach Kernel's code, because it would cause that code's use to be restricted to what's allowed under the GPL.
libraries, kernel modules, etc. Finally, it is generally accepted (although not explicitly stated) that you can put code into the kernel in an optional module, so long as that module is governed by the GPL, and so long as the operation of the kernel as a whole does not depend on that module.
The Mach MK as used by MKLinux is substantially similar to that which is expected to be used in MacOS X in that they are both based on Mach 3.
www.mklinux.org /development/Mach_FAQ.html   (671 words)

 Month of Kernel Bugs (MoKB) archive
The squashfs module of the Linux kernel (2.6.x) fails to properly handle corrupted fs structures, leading to a denial of service and possible data corruption condition.
The UFS filesystem handling code of the Solaris 10 kernel fails to properly handle corrupted data structures, leading to an exploitable denial of service issue and potential loss of data or corruption of the local UFS filesystems, due to memory corruption.
A vulnerability in the handling of GDI kernel structures of Microsoft Windows leads to an exploitable memory corruption condition, causing a denial of service (so-called BSoD) or arbitrary code execution on successful exploitation.
projects.info-pull.com /mokb   (1599 words)

kernels que, por su tamaño, podrían dejar de considerarse como ``micro'' (lo que no resta importancia a la contribución que estos sistemas supusieron).
kernel emplea puertos [55, 21] como mecanismo básico de IPC.
Ya comentamos en el capítulo anterior que Mach introdujo y extendió el uso de paginadores externos como técnica común para obtener más flexibilidad (y adaptabilidad) en gestión de memoria [24, 179].
plan9.escet.urjc.es /who/nemo/export/thesis/node108.html   (326 words)

 Mach 3.0 Sources
It is possible to browse this space and any of the various Mach files using a WWW browser.
The current version number of the kernel sources (check this to see if you need to get a fresh copy).
The directory from which the kernel sources were tar'red: src.
www-2.cs.cmu.edu /afs/cs/project/mach/public/www/sources/sources_top.html   (450 words)

 Kernel Fun
Apple Airport Extreme driver fails to handle certain beacon frames, leading to an out of bounds memory access, resulting in a so-called kernel panic.
Other security implications may exist, although this hasn't been verified and no details can be provided until further research is done.
Besides hosting the Month of Kernel Bugs, this blog aims to provide information about kernel-land bugs, hacks and tricks.
kernelfun.blogspot.com   (558 words)

 Building the Kernel (xnu)   (Site not responding. Last check: 2007-10-18)
The newer kernel uses a loader in the kernel, and it references a library that is in the newer
BootX is also able to boot an alternate mach system when you press B at boot time.
The default kernel as it lives in the CVS repository is configured with just about everything you'll need.
www.opendarwin.org /en/faq/ch04s02.html   (815 words)

 Compiling a Mach/xnu kernel for MacOSX
Do not start playing with your Mac's kernel unless have some idea of what you're actually doing and you're happy taking the risks associated with it.
Credit to Jean-Pierre Mouilleseaux for the following idea: Instead of just putting it over the top of the existing kernel, you can have a second kernel and configure OpenFirmware to boot from the second kernel, allowing you an easy way out if the new kernel is corrupt.
So now your new kernel is installed and you can test it by restaring or simply typing "reboot" at a command line.
www.bur.st /~paul/compile_xnu.html   (631 words)

 The GNU Hurd - GNU Project - Free Software Foundation (FSF)
In the text of the GNU Manifesto, he mentioned that there is a primitive kernel.
The CMU lawyers are currently deciding if they can release Mach with distribution conditions that will enable us to distribute it.
CMU has available under the same terms as Mach a single-server partial Unix emulator named Poe; it is rather slow and provides minimal functionality.
www.gnu.org /software/hurd/history.html   (451 words)

 Open Source
A guided introduction and learning path for developers new to Open Source.
With its open-source core based on FreeBSD 5.0 and the Mach 3.0 microkernel, Mac OS X is the best Macintosh operating system ever for UNIX users.
Beneath its elegant new UI, Leopard offers many system-level updates, including  full POSIX compliance.  Read about what's new in the Mach kernel, security, Bonjour and the file system.
developer.apple.com /darwin   (345 words)

 Need 10.3.6 mach_kernel and related files. - macosx.com - Mac Support
I have a beige g3 running 10.3.6 and during a startup I had a kernel panic which led to some had drive corruption.
Well I got someone elses kernel and I indeed did get further in the boot process.
Unfourtunately it was not the only file that was corrupted so I ended up reinstalling
www.macosx.com /forums/showthread.php?t=47469   (219 words)

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