l4-hackers

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2827 discussions

Launch of L4Linux
by Maximin Coste 29 Jul '13

29 Jul '13

Hi all, I trying to launch L4Linux over Fiasco.OC+L4RE but here is my serial output: INITRD: Freeing memory. l4x: Checks passed. NetWinder Floating Point Emulator V0.97 (double precision) msgmni has been set to 126 io scheduler noop registered io scheduler deadline registered io scheduler cfq registered (default) L4 serial driver ttyLv0 at MMIO 0x1 (irq = 211) is a L4 l4ser_shm: L4 shared mem serial driver l4cdds: No name given, not starting. brd: module loaded l4bdds: No name given, not starting. mousedev: PS/2 mouse device common for all mice TCP: cubic registered NET: Registered protocol family 17 RAMDISK: ext2 filesystem found at block 0 RAMDISK: Loading 3072KiB [1 disk] into ram disk... done. VFS: Mounted root (ext2 filesystem) readonly on device 1:0. Freeing init memory: 112K /bin/sh: can't access tty; job control turned off # io | Dev_factory: register factory for N2Hw6DeviceE io | GTF: register factory for 7Pci_dev io | GTF: register factory for N2Hw12Msi_resourceE io | Dev_factory: register factory for N2Hw11Gpio_deviceE io | Io service io | Ready. Waiting for request. [ ...Launching µC/OS-II part... ] So all I got from L4Linux is "/bin/sh: can't access tty; job control turned off" What does that mean ? I also have to say that I use the ramdisk.rd from the official website (http://os.inf.tu-dresden.de/L4/LinuxOnL4/download/drops-rd.rd), is this correct ? This is the content of my modules.list file: modaddr 0x1100000 entry l4LinuxUcos kernel fiasco -serial_esc roottask moe rom/l4lx_ucos.cfg module l4re module ned module io module l4lx_ucos.cfg module vmlinuz.arm module ramdisk-arm.rd module l4ucos module beagle.devs module beagle.io And here is my l4lx configuration file: loader:start( { caps = { log = L4.Env.log:m("rws"), calc_server = calc_server, }, l4re_dbg = L4.Dbg.Warn, log = { "l4linux", "yellow" }, mem = L4.Env.mem_alloc:create(L4.Proto.Factory, 100*1024*1024):m("rws"), scheduler = L4.Env.user_factory:create(L4.Proto.Scheduler, 0x80, 0x70) }, "rom/" .. lxname .. " mem=64M console=ttyLv0 l4x_rd=rom/ramdisk-" .. L4.Info.arch() .. ".rd root=1:0 ramdisk_size=17000 init=/bin/sh earlyprintk=1"); Thanks in advance, -- Maximin COSTE-LEENHARDT

2 9

Getting fiasco-ux to exit after moe's init process terminates
by John Millikin 27 Jul '13

27 Jul '13

I'm just getting started with L4 and Fiasco, and wanted to try a Hello World. The goal is to have a program which will run in fiasco-ux, print some text to the screen, and then exit back to the terminal. $ cat helloworld.c #include <stdio.h> int main(int argc, char **argv) { printf("Hello world from L4!\n"); return 1; } I'm encountering a problem where after the program runs, moe detects that it's terminated but doesn't itself exit. $ ./fiasco -R './moe --init=rom/helloworld' -l ./l4re -l ./helloworld [...] MOE: cmdline: ./moe --init=rom/helloworld MOE: Starting: rom/helloworld MOE: loading 'rom/helloworld' Hello world from L4! MOE: task 1557475 exited with 1 Looking through src/l4/pkg/moe/server/src, I can't find any obvious way to make moe exit when its init process terminates. Being able to exit seems like fairly important functionality, so I assume it's present somewhere, but I can't figure out how to enable it. moe has no flags related to exiting, and its main() appears to end in the infinite-loop server.loop_noexc() procedure. Is exiting supported? If yes, how do I enable it? If no, why, and would patches be accepted to do this?

2 1

Problem with setting up namespaces
by Johannes Schlatow 19 Jul '13

19 Jul '13

Hi, I was just trying to set up a simple application that uses L4Re namespaces. I therefore took the clntsrv example and modified it as shown in the diff below with the result that the server blocks on the bind_thread() call. Am I missing something? Cheers Johannes diff --git a/src/l4/pkg/examples/clntsrv/clntsrv.cfg b/src/l4/pkg/examples/clntsrv/clntsrv.cfg index bb2ae50..dd7dfa5 100644 --- a/src/l4/pkg/examples/clntsrv/clntsrv.cfg +++ b/src/l4/pkg/examples/clntsrv/clntsrv.cfg @@ -9,13 +9,16 @@ local ld = L4.default_loader; -- Channel for the two programs to talk to each other. local calc_server = ld:new_channel(); +local server_ns = ld:create_namespace({ calc_server = calc_server:svr()}); +local client_ns = ld:create_namespace({ calc_server = calc_server}); + -- The server program, getting the channel in server mode. -ld:start({ caps = { calc_server = calc_server:svr() }, +ld:start({ caps = { namespace = server_ns }, log = { "server", "blue" } }, "rom/ex_clntsrv-server"); -- The client program, getting the 'calc_server' channel to be able to talk -- to the server. The client will be started with a green log output. -ld:start({ caps = { calc_server = calc_server }, +ld:start({ caps = { namespace = client_ns }, log = { "client", "green" } }, "rom/ex_clntsrv-client"); diff --git a/src/l4/pkg/examples/clntsrv/server.cc b/src/l4/pkg/examples/clntsrv/server.cc index 2f2e3fc..9c4c0b9 100644 --- a/src/l4/pkg/examples/clntsrv/server.cc +++ b/src/l4/pkg/examples/clntsrv/server.cc @@ -12,6 +12,7 @@ #include <l4/re/util/cap_alloc> #include <l4/re/util/object_registry> #include <l4/cxx/ipc_server> +#include <l4/re/namespace> #include "shared.h" @@ -60,12 +61,34 @@ main() { static Calculation_server calc; - // Register calculation server - if (!server.registry()->register_obj(&calc, "calc_server").is_valid()) - { - printf("Could not register my service, is there a 'calc_server' in the caps table?\n"); - return 1; - } + L4::Cap<L4Re::Namespace> ns = L4Re::Env::env()->get_cap<L4Re::Namespace>("namespace"); + if (!ns.is_valid()) { + printf("Could not get namespace cap from cap table.\n"); + return 1; + } + L4::Cap<L4::Ipc_gate> calc_server = L4Re::Util::cap_alloc.alloc<L4::Ipc_gate>(); + + if (ns->query("calc_server", calc_server) != 0) { + printf("Could not get 'calc_server' cap from namespace\n"); + return 1; + } + + if (!calc_server.is_valid()) { + printf("calc_server cap is invalid\n"); + return 1; + } + + l4_umword_t id = l4_umword_t(0xcaffee); + L4::Cap<L4::Thread> tcap = L4Re::Env::env()->main_thread(); + + printf("bind_thread()...\n"); + int err = l4_error(calc_server->bind_thread(tcap, id)); + if (err < 0) { + printf("failed\n"); + return 1; + } + + printf("OK\n"); printf("Welcome to the calculation server!\n" "I can do substractions and negations.\n");

4 6

Fiasco.OC Kernel memory running out (I think)
by Daniel Waddington 18 Jul '13

18 Jul '13

Hi, I'm using Fiasco.OC r56 on x86_64 (with Genode). After doing quite a lot of memory mapping, mem_map finally fails. It seems that the _allocators[0]->alloc(...) fails during the Mapping_tree::new operator creation of a Mapping_tree object in the Treemap::tree method. How can I increase the available kernel memory attached to this allocator? Thanks Daniel

2 1

Error during the "ned" package build (svn revision 42)
by ggasnier31＠free.fr 16 Jul '13

16 Jul '13

Hello, I got the following error building the "ned" package for ARM architecture (Cortex-A9, Pandaboard). I use the last Linaro toolchain "gcc-linaro-arm-linux-gnueabihf-4.7-2012.12-20121214_linux". === Building package "ned" === make[1]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned' make[2]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server' make[3]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' ... Building /home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/.general.d make[3]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' make[3]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' make[4]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' ... Building .general.d ... Building Makefile.inc make[4]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' make[4]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' make[4]: *** No rule to make target `ned.lua.bin.o', needed by `ned'. Stop. make[4]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' make[3]: *** [/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f] Error 2 make[3]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' make[2]: *** [src] Error 2 make[2]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server' make[1]: *** [server] Error 2 make[1]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned' make: *** [ned] Error 2 Commenting the line "OBJS += ned.lua.bin.o" in the file l4/pkg/ned/server/src/Makefile gives this error. ==> Linking ned lua.o: In function `lua(int, char const* const*)': /home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src/lua.cc:97: undefined reference to `_binary_ned_lua_start' /home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src/lua.cc:97: undefined reference to `_binary_ned_lua_end' make[4]: *** [ned] Error 1 make[4]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' make[3]: *** [/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f] Error 2 make[3]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' make[2]: *** [src] Error 2 make[2]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server' make[1]: *** [server] Error 2 make[1]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned' make: *** [ned] Error 2 Regards, Guillaume GASNIER

3 3

x86_fb-example
by Rudolf Weber 15 Jul '13

15 Jul '13

Hello, I want to try out the x86-fb-example in the l4re-snapshot-2013060718. I found the following patch necessary: --- src/l4/conf/examples/x86-fb.list.vorrudi 2013-06-07 18:36:35.000000000 +0200 +++ src/l4/conf/examples/x86-fb.list 2013-07-12 18:23:39.688816451 +0200 @@ -1,5 +1,5 @@ -modaddr 0x1100000 +modaddr 0x2000000 entry x86-fb-example bootstrap bootstrap -serial @@ -13,4 +13,4 @@ module ned module fb-drv module mag -module ex_fb_spectrum +module ex_fb_spectrum_cc --- src/l4/conf/examples/x86-fb.cfg.vorrudi 2013-06-07 18:36:35.000000000 +0200 +++ src/l4/conf/examples/x86-fb.cfg 2013-07-12 18:12:30.837274646 +0200 @@ -64,5 +64,5 @@ l4re_dbg = L4.Dbg.Warn, -- scheduler = L4.Env.user_factory:create(L4.Proto.Scheduler, 0x18, 0x8), }, - "rom/ex_fb_spectrum"); + "rom/ex_fb_spectrum_cc"); print("ex_fb_spectrum exited with: " .. e:wait()); I generated a iso-Image with make grub2iso E=x86-fb-example MODULES_LIST=/home/rw/l4exp/l4re-snapshot-2013060718/src/l4/conf/examples/x86-fb.list and started with qemu-system-i386 -cdrom images/x86-fb-example.iso -serial stdio It's great to have examples ! Greetings Rudolf Weber http://www.infnet.verein.de/home/rw/index.html Computer Science and Network Club Ravensburg

2 1

Help needed
by vijay kumar godavarthy 06 Jul '13

06 Jul '13

Dear all, I am a newbie to l4re and fiasco. I would like to execute the client-server example given in the example directory. Please let me know the steps to be followed. In case I write a new server how to compile and execute it in QEMU. Best regards and many thanks -- vijay kumar

2 1

A interprocess communication system for two l4linux instances
by Wajidali Whowe 05 Jul '13

05 Jul '13

Dear all, I am trying to implement an IPC method between two l4linux instances (lets call them as vmlinuz1 and vmlinuz2) using l4ser driver. Nevertheless both l4linux instances stuck during boot up printing, the following last sentence: "vmlinuz.| L4 serial driver" Going over the driver/tty/serial/l4ser.c file, I have seen that the stuck position line is in the function "l4ser_init_port"; "t = L4XV_FN(l4_msgtag_t, l4_icu_bind(l4ser_port[num].vcon_cap, 0, l4ser_port[num].vcon_irq_cap));" The following is my lua script: local ttyChannel = l:new_channel(); local hid = l:new_channel(); local linux_caps = { log = L4.Env.log:m("rws"); vbus = io_caps.linux_bus, rtc = rtc_caps.rtc, ev = hid:svr(), rom = L4.Env.rom, ttyMv0 = ttyChannel, }; l:start( { caps = linux_caps, }, "rom/vmlinuz1 mem=512M l4ser.add=ttyMv0 l4-input-srv.enable=1 console=ttyLv0 ramdisk=rom/myRamdisk root=1:0 ramdisk_size=190000 l4x_rd=rom/myRamdisk init=/sbin/init"); local linux_caps2 = { vbus = io_caps.linux_bus2, rtc = rtc_caps.rtc, rom = L4.Env.rom, ttyMv0 = ttyChannel, }; l:start( { caps = linux_caps2, }, "rom/vmlinuz.android mem=512M l4ser.add=ttyMv0 console=ttyLv0 ramdisk=rom/ramdisk root=1:0 ramdisk_size=190000 l4x_rd=rom/ramdisk init=/sbin/init"); How do you think that might cause the problem? Best regards and many thanks.

1 0

Thought you'd find this interesting
by Rahul Singhal 30 Jun '13

30 Jun '13

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15th Real Time Linux Workshop - Call for Papers
by Nicholas Mc Guire 25 Jun '13

25 Jun '13

15th Real Time Linux Workshop 1st Call for Papers October 28 - 31, 2013 Dipartimento tecnologie innovative Scuola universitaria professionale della Svizzera italiana Lugano-Manno Switzerland Following the meetings of academics, developers and users of real-time and embedded Linux at the previous 14 Real Time Linux Workshops held world-wide (Vienna, Orlando, Milano, Boston, Valencia, Singapore, Lille, Lanzhou, Linz, Guadalajara, Dresden, Nairobi, Prague and Chapel Hill) - the 2013 Real Time Linux Workshop will come to the Scuola Universitaria Professionale della Svizzera Italiana in Lugano-Manno, Switzerland. It will be held from October 28 to October 31, 2013. Rationale Real-time systems have evolved over the past decades in a relatively calm manner - performance has increased, one can say dramatically, but the main paradigms were pretty stable since the mid 80s. With the considerable increase of computing power, notably with multicore systems becoming mainstream in embedded devices, the requirements on RTOS are shifting and the tools are again trying to catch up. In stark contrast to 1999 (when the first RTLWS took place), Linux has a strong position in all kind of embedded systems, ranging from consumer electronics to network devices and a broad range of industrial applications including safety related systems. The technological resources suitable for high-availability, real-time, and safety critical systems have been continuously expanding and improving - allowing to cover the entire development life cycle of industrial projects based on open-source tools. At the core of this development is the availability of stable operating systems with reliable real-time properties. Extending and improving the real-time properties of Open Source RTOS is a continuous research and development effort. The OSADL has set itself the ambitious goal to document these efforts and it's most effective tool to do so is the annual Real Time Linux Workshop. Call for papers Authors from regulatory bodies, academics, industry as well as the user-community are invited to submit original work dealing with general topics related to Open Source and Free Software based real-time systems research, experiments and case studies, as well as issues of integration of open-source real-time and embedded OS. A special focus will be on industrial case studies and safety related systems. Topics of interest include, but are not limited to: - Modifications and variants of the GNU/Linux operating system and extending its real-time capabilities, - Contributions to real-time Linux variants, drivers and extensions, - Tools for the verification and validation of real-time properties, - User-mode real-time concepts, implementation and experience, - Real-time Linux applications, in academia, research and industry, - Safety related FLOSS systems, - Safety related systems using FLOSS components, - FLOSS Tools used to analyze, verify or validate safety properties, - Work in progress reports, covering recent developments, - Educational material on real-time Linux, - RTOS core concepts, RT-safe synchronization mechanisms, - RT-safe IPC mechanisms for RT and non RT components, - Analysis and benchmarking methods and results of real-time GNU/Linux variants, - Debugging techniques and tools, both for code and temporal debugging of core RTOS components, drivers and real-time applications, - Real-time related extensions to development environments Abstract submission If you wish to present a paper at the workshop, please submit an abstract using the submission page at https://www.osadl.org/RTLWS15-Abstract.submission-form.0.html. Final paper to be included into the RTLWS15 Proceedings Upon acceptance of an abstract by the RTLWS15 Program Committee, the author will be invited to submit a full paper in a form defined by https://www.osadl.org/paper.tgz. A detailed description of the editing and formatting process will be provided along with the notification email. Further information: http://www.osadl.org/RTLWS Important dates July 29, 2013 - Abstract submission deadline August 26, 2013 - Notification of acceptance September 23, 2013 - Submission of final paper October 28-31, 2013 - Workshop Organization committee: Local organizers: - Roberto Bucher, Scuola universitaria professionale della Svizzera italiana SUPSI, Switzerland OSADL/RTLF - Carsten Emde, OSADL - Nicholas Mc Guire, OSADL - Andreas Platschek, ICT, Vienna University of Technology, Austria Program committee: - Alexey Khoroshilov, ISPRAS, Russia - Andrea Bastoni, SYSGO AG, Germany - Andreas Platschek, TU-Wien, Austria - Bernhard N�lte, IQSE TueV SueD Rail, Germany - Carsten Emde, OSADL, Germany - Cheng Sheng, Beijing Shenzhou Aerospace Software Technology, China - Fans, Spectrum Sys, China - Georg Schiesser, OpenTech EDV Research, Austria - Herman H�rtig, Technische Universit�t Dresden, Germany - Julia Lawall, Inria/LIP6, France - Julien Delange, Carnegie Mellon Software Engineering Institute, USA - Klaus Reichl, Base Systems Technology Thales, Austria - Matthias Auchmann, A&R TECH, Austria - Michal Sojka, Czech Technical University in Prague, Czech Republic - Nicholas Mc Guire, OpenTech EDV Research, Austria - Paul E. McKenney, IBM Linux Technology Center, USA - Paolo Mantegazza, Politecnico di Milano, Italy - Peter Okech, University of Nairobi, Kenya - Peter Wurmsdobler, Aveillant Ltd, UK - Peter Zijlstra, RedHat, Netherlands - Philippe Gerum, Xenomai, France - Roberto Bucher, SUPSI, Switzerland - Shawn Choo, Weslab, Singapur - Stefan Schoenegger, B&R, Austria - Steven Rostedt, RedHat, USA - Thomas Gleixner, Linutronix, Germany - Yutaka Matsuno, University of Electro-Communications, Japan - Zhou Qingguo, DSLab, Lanzhou University, China Workshop organizers: - Dipartimento Tecnologie Innovative, SUPSI, Switzerland - Open Source Automation Development Lab (OSADL) Roberto Bucher Carsten Emde Nicholas Mc Guire Andreas Platschek

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l4-hackers