This list is intended for discussions about the L4 microkernel family and software running on top of L4. ()

headers fang zhengshu | 2 Sep 03:43

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Hi,

the open_component and close_component function do get as first
parameter the sender of the invocation (see Chapter 2.3 in the Dice
manual
http://www.inf.tu-dresden.de/content/institutes/sya/os/forschung/projekte/dice/manual-3.3.0.pdf).

To get the thread ID of the server to which you want to send the
open_call or close_call, you need some name service. See
http://www.inf.tu-dresden.de/index.php?node_id=1314&ln=en and
http://www.inf.tu-dresden.de/index.php?node_id=1315&ln=en.

Cheers, Ron.

fang zhengshu wrote:
> hi all,
>  
> could someone tell me how to get the thread id when do the
> open_call()/close_call()?
> or we can get the thread id unless wo do the l4_ipc_send() operation?
>  
> I only want to get the thread id who do the open_call()/close_call()
> operation? When more than one task do the operation The server can store
> the thread id.
> 
> thank you and best wishes.
>  
>  
> On Sun, Aug 30, 2009 at 6:00 PM,
> <l4-hackers-request <at> os.inf.tu-dresden.de
> <mailto:l4-hackers-request <at> os.inf.tu-dresden.de>> wrote:
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>     Today's Topics:
> 
>       1. Re: can server side get the thread id of client side?
>          (fang zhengshu)
> 
> 
>     ----------------------------------------------------------------------
> 
>     Message: 1
>     Date: Sun, 30 Aug 2009 02:57:16 -0400
>     From: fang zhengshu <fangzhsh07 <at> gmail.com <mailto:fangzhsh07 <at> gmail.com>>
>     To: l4-hackers <at> os.inf.tu-dresden.de
>     <mailto:l4-hackers <at> os.inf.tu-dresden.de>
>     Subject: Re: can server side get the thread id of client side?
>     Message-ID:
>            <a73d246f0908292357w7ddaed5cwdb2a3013b07020c5 <at> mail.gmail.com
>     <mailto:a73d246f0908292357w7ddaed5cwdb2a3013b07020c5 <at> mail.gmail.com>>
>     Content-Type: text/plain; charset="iso-8859-1"
> 
>     hi all,
> 
>      3. Re: can server side get the thread id of client side?
>     >      (Bj?rn D?bel)
>     > Message: 3
>     > Date: Fri, 28 Aug 2009 09:40:17 +0200
>     > From: Bj?rn D?bel <doebel <at> os.inf.tu-dresden.de
>     <mailto:doebel <at> os.inf.tu-dresden.de>>
>     > To: L4 Hackers <l4-hackers <at> os.inf.tu-dresden.de
>     <mailto:l4-hackers <at> os.inf.tu-dresden.de>>
>     > Subject: Re: can server side get the thread id of client side?
>     > Message-ID: <4A9789E1.7080503 <at> os.inf.tu-dresden.de
>     <mailto:4A9789E1.7080503 <at> os.inf.tu-dresden.de>>
>     > Content-Type: text/plain; charset=ISO-8859-1
>     >
>     > -----BEGIN PGP SIGNED MESSAGE-----
>     > Hash: SHA1
>     >
>     > Hi,
>     >
>     > > I know that the client side can get the server's thread_id throw
>     name
>     > > service. I want to ask can the server side get the client's
>     task_id or
>     > > thread_id?
>     > > or must the client side send the thread_id to server?
>     >
>     > your server will call either l4_ipc_wait() or
>     l4_ipc_reply_and_wait() in
>     > order to receive the message from the client. In both cases there is a
>     > src parameter which will contain the client's thread ID after the
>     system
>     > call returns.
>     >
>     sorry for not explaining it clearly.
>     if I defined two functions in idl file, just like:
>     interface test{
>     int open(int fd, int flags);
>     int close(fd);
>     };
> 
>      and I implement them in the server side.
>     I know that when I use open()/close() in the client side, the server
>     will
>     call the function open_component()/close_component() which are in
>     the server
>     side.
> 
>     In the open_component()/close_component() function I want to get
>     thread id
>     of the caller to do some operation flag.but as we know, when we call
>     open()/close() in client side, the open_component()/close_component()
>     function in server side will be executed. so we can not use
>     l4_ipc_wait() or
>     l4_ipc_reply_and_wait() function in the
>     open_component()/close_component()
>     function, or it will be stop and wait for a message in the function.
>     So in
>     order to get the thread id in the
>     open_component()/close_component(), when
>     or where should I use the l4_ipc_wait() or l4_ipc_reply and wait()
>      to get
>     the thread id?
> 
>     thank you!
> 
> 
> 
> 
> 
>     --
>     fang,
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>     End of l4-hackers Digest, Vol 76, Issue 13
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> 
> 
> 
> -- 
> fang,
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
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Hi,

>          And I have some questions to ask:
>         1. I used the l4linux-2.6.30 kernel, now to booting it besides
> fiasco default config, there is
>                 [ *] Enable I/O port protection
>             feature must need, isn't it?
>             It not needed in l4linux-2.6.23 kernel or earlier.

This is not a Linux feature, but one from the Fiasco kernel. You should
have it enabled by default. It basically prevents applications from
accessing I/O ports unless they are the first to access these.
Otherwise, your application needs to get them mapped (using an I/O
flexpage) from an application that has access to the IO/ ports.

>         2. Will this feature prevent the other server to access to the io
> port?
>             I seems meeting this problem, my parport server(#b) want to
> access the port 077a, but system say the owner is #a(l4io), even I set the
> parport priority higher than l4io, it also the same problem. the last error
> message is like follow:
>            ...............................
>            server  | <6>parport0: PC-style at 0x378 [PCSPP,TRISTATE]
>            server  | <6>parport0: irq 7 detected
>            ROOT: Cannot send port 077a to task #0b, owner is #a
>            ROOT: task B.00 at 01804299 is trying to get I/O port 077a
> allocated by task 0b.

What are tasks A and B? Assuming A is your parport server and B is L4IO,
then you need to call l4io_request_region() to retrieve the ports you
want to access from L4IO. As your parport server is DDE-based you can
also do this using Linux' means (request_region()).

>            ................................
>          How can I do could make the parport server run together with the
> l4linux, or to make it could access the port it needed?

I don't see where L4Linux comes into play here?

Bjoern

Hello:
	I try to run the same two duplicate components on top of Fiasco but there is 
an error about memory overlapping problem.
	The problem is very simple which read the value of tsc looply like this:

int main(int argc, char ** argv)
{
        l4_uint64_t val;
        //rdtscll(val);
        l4_calibrate_tsc();
        val = l4_rdtsc();
        while(1)
        {
                printf("0x%0x:%0x\n", (unsigned long)((val>>32)&0xFFFFFFFF),
                                (unsigned long)(val&0xFFFFFFFF));
                //rdtscll(val);
                val = l4_rdtsc();
                l4_sleep(2);
        }
        l4_sleep_forever();
        return 0;
}
	In the menu.lst this modules was loaded twice like this:
module  /rdtsc
module  /rdtsc
	When booting the error messsage is like this:
#09: loading "/rdtsc"
     from [034c0000-034eff24] to [01000000-01003857][01004000-01009000]
     entry at 00065060 via trampoline page code
     symbols at [0eae2000-0eae3000] (4kB), lines at [0eade000-0eae2000] (16kB)
#0a: loading "/rdtsc"
     from [034f0000-0351ff24] to [01000000-01003857]
Roottask: cannot load binary because address at 01000000 not free
  loaded module:   [034f0000-0351ff24) /rdtsc
  overlaps with:   [01000000-01004000) #09 rdtsc

	Can i configure these two rdtsc with loading different address?
											Cheng

Hi Cheng,

> 	In the menu.lst this modules was loaded twice like this:
> module  /rdtsc
> module  /rdtsc

That's as expected. You statically try to put the rdtsc image into the
same physical memory area twice.

2 solutions: You can either compile the rdtsc app twice and use
different DEFAULT_RELOC settings, or use the loader to load the
application twice.

Bjoern

On Wednesday 02 September 2009 11:16:47 pm Björn Döbel wrote:
> Hi Cheng,
>
> > 	In the menu.lst this modules was loaded twice like this:
> > module  /rdtsc
> > module  /rdtsc
>
> That's as expected. You statically try to put the rdtsc image into the
> same physical memory area twice.
>
> 2 solutions: You can either compile the rdtsc app twice and use
> different DEFAULT_RELOC settings, or use the loader to load the
> application twice.
	Thank you. I start to know what DEFAULT_RELOC is but before i ignore this 
option all the time.
						Cheng

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Hello:
	I checked the crt0_x.S in the crtx package and find something interesting. In 
the crt0_x.S the main function is named __main() but not main() normally.
	But in the normal function we still use main() but not main() i want to know 
where to address with the symbol __main() by the address of main() in the 
real application.
	I look around the crtx package, mk directory and libgendep.so unluckily i 
don't find it.
	thanks a lot.
								Cheng Guanghui

Hi,

if you seek help on your code, please provide

* working source code of your example
  * output of your compile run
* your Fiasco kernel configuration
* full log output
* menu.lst and if necessary loader config

Cheers,
Bjoern

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Re: l4-hackers Digest, Vol 76, Issue 13

Re: l4-hackers Digest, Vol 76, Issue 13

My problem of I/O port

Re: My problem of I/O port

the memory overlapping problem when loading the two duplicate components

Re: the memory overlapping problem when loading the two duplicate components

Re: the memory overlapping problem when loading the two duplicate components

page fault:no entry in region list

the __main symbol in the crt0_x.S

Re: page fault:no entry in region list

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