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At 2011-03-21 00:48:08?"Gedare Bloom" <gedare at gwmail.gwu.edu> wrote:
>Maybe I misunderstood your intent. Do you plan to port RTEMS to run on
>top of a real-time hypervisor, or to make RTEMS become a real-time
>2011/3/20 Gedare Bloom <gedare at gwmail.gwu.edu>:
>> I am concerned with this project. The lack of support for MMU in RTEMS
>> means that memory protection is not available within the kernel, so it
>> will be hard to implement a proper hypervisor.
>> 2011/3/20 ??? <157724595 at 163.com>:
>>> Sorry for forgetting add the reference link.
>>> . http://www.rtems.com/wiki/index.php/RTEMSHyperVisor
>>> . http://air.di.fc.ul.pt/air/?Home
>>> . http://www.xtratum.org/
>>> . http://www.helenos.org/
>>> At 2011-03-20 21:50:39?"???" <157724595 at 163.com> wrote:
>>> Hi, all:
>>> I am a student who is preparing for participating the GSOC2011 RTEMS. My
>>> interested project is RTEMS HyperVisor . This
>>> project 's ultimate goal is to make RTEMS support to run multiple operating
>>> systems?like Linux or uclinux) and meantime RTEMS can be
>>> adapted to fullfill the requirements defined in the ARINC 653 standard. So
>>> the project is divided into two milestone tasks: 1) add a HyperVisor to
>>> RTEMS. the design of HyperVisor is compatible with ARINC 653 standard. 2).
>>> implement ARINC 653 interface in
>>> RTEMS which can reference the a ESA project named AIR.
>>> Hypervisor, also called virtual machine monitor (VMM), is one of
>>> virtualization techniques which allow multiple operating systems.
>>> For embedded systems it must have real-time capability. And there is also a
>>> challenge to the resource-constrained embedded
>>> systems, because support for virtualization requires memory protection (in
>>> the form of a memory management unit or at least a
>>> memory protection unit) and a distinction between user mode and privileged
>>> mode, which rules out many microcontrollers. About the implement of
>>> HyperVisor for RTEMS there are two projects we can reference. First is
>>> project XtratuM  which is a small
>>> native (bare-metal) hypervisor, now the RTEMS has been ported to XtratuM run
>>> as a guest OS and its design use ARINC 653 as
>>> a reference although ARINC-653 is not directly applicable to the hypervisor
>>> systems. Another project is HelenOS operating
>>> system  which is designed as a relatively small microkernel assisted with
>>> a set of userspace drivers and server tasks, Its kernel
>>> is a good reference candidate for the design of Hypervisor.
>>> This is just my initial thoughts, if there is any inappropriate please point
>>> out. Do not hesitate to add your comments.
>>> Wenjie Zhang
>>> Best Regards
>>> rtems-users mailing list
>>> rtems-users at rtems.org
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