design Real-Time Process in RTEMS

[阎淼]

hi:

  I am writing page code, and start to identify all system calls.
  may be we can cooperate on this?

2007/9/17, rtems skyeye <skyeye.rtems at gmail.com>:
> hi:
>   the RTP prototype will be tesed in X86 CPU.
>   I already let paging (1phy--1 virtual) work correctly. (just use the
> Functions already in RTEMS)
>   I also try  the process  CPL0--> CPL3 then syscall from CPL3-->CPL0 and
> made it work.
>   Now, I am trying the user-level thread(in CPL3) can cooperate with
> kernel-level thread(in CPL0) without paging.
>   Next,  I will try the user-level thread(in CPL3) can cooperate with
> kernel-level thread(in CPL0) with  1-1 paging.
>
>   I spent my spare time on these works, so the progress is
> slowly.
>
>   Anyone have some advice?
>
>
> On 9/3/07, rtems skyeye < skyeye.rtems at gmail.com> wrote:
> > hi,
> >   Good idea!
> >   I think we can first realize the initial VM support in RTEMS.
> >   because there  are already some page support funcs in rtems X86 port.
> >   then we can try syscall,....
> >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: 阎淼 < yanmiaobest at gmail.com>
> > Date: Sep 3, 2007 11:21 AM
> > Subject: Re: design Real-Time Process in RTEMS
> > To: rtems skyeye < skyeye.rtems at gmail.com>
> >
> > Hi:
> >
> >    I have been thinking about it too.
> >    here is what I think:
> >
> >    1.  page routine should be created to support page manipulations(
> > page table operation, TBL, page allocate, set page state ...)
> >    2.  identify all system call routines
> >    3.  create entry points and exit points for system call
> >    4.  adjust context switch ralated routine
> >    5.  add privilege transition code
> >
> >    best regards!
> >
> > 2007/8/31, rtems skyeye <skyeye.rtems at gmail.com>:
> > > hi,
> > >   VxWorks 6.x have the Real-Time Process (RTP) extension.
> > >   I think we also can implement the RTP in RTEMS.
> > >   The Idea is :
> > >   1 RTP contains 1~n user-level rtems-task, and process the
> > > virtual memory related things.
> > >   2 the mapping relation of virtual memory :phyiscal memory is 1:1
> > >   3 the user-level task in RTP can access kernel function
> > > by syscall
> > >   4 the user-level tasks and the kernel-level tasks are in the same
> > > scheduling strategy.
> > >
> > >   the advantage of RTP is:
> > >    1 the crash of user-level tasks in RTP can not destroy user-level
> > > tasks in other RTP and the kernel.
> > >    2 compatible with the old task model.
> > >    3 the context switch  is faster than that of general OS (such as
> linux)
> > >
> > >    anyone have  some advices on RTP in RTEMS?
> > >
> > > Regards
> > >
> > >   skyeye.rtems
> > >
> > >
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> > >
> > >
> >
>
>