May 2009 - l4-hackers - example.com Site

Back to UTCB IPC
by Marc CHALAND 11 Oct '09

11 Oct '09

Hi, I am back with my problem with UTCB IPC. To sum up the context : I use pure l4env applications. Here is the scenario between my server and my client : 1. client makes an UTCB IPC to manager. Manager does an l4rm_area_reserve, creates a rcv_fpage, creates worker and sends back worker thread id to client. 2. client allocates memory and associated flexpage and sends it to server. 3. UTCB IPC is sent to worker with 3 parameters : - on client side : utcb->values=0xbff00200: arg1=0x2 arg2=0x1 arg3=0x6 - on server side : utcb->values=0xbff00200: arg1=0x241401 arg2=0x0 arg3=0x7069776c It seems that 0xbff00200 is not mapped on the same memory on client and server side. As there is no problem for first IPC (utcb->values is also 0xbff00200), is there any potential problem with flexpage ? As utcb->values is still the same, what happens if several threads try to make UTCB IPC ? Another question : when I link my application with liblogserver.a, I have strange logs : .rm.sem.mainMain function returned. It seems that .rm .sem and .main are added by l4env, but I didn't find where. Regards Marc

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The implementation of CPU reservation server
by Sean 08 Jun '09

08 Jun '09

Dear Now I am tracing the source code of cpu reservation server in l4/pkg/cpu_reserve directory. And I got several questions... 1. The bottom of cpu reservation server is implemented by l4_rt_add_timeslice(), l4_rt_set_period(), l4_rt_begin_strictly_periodic() functions. And these functions are defined in l4/pkg/l4sys/include/ARCH-x86/rt_sched-impl.h which calls l4_rt_generic() function. Function l4_rt_generic() is implemented by inline assembly, and it seems to call the system call "thread_schedule". Because these functions only appears in ARCH-x86 directory, do they support on ARM architecture? If not, how can I implement similar behaviors of these functions? Where can I find the document about the L4 system call API ? I can't really understand the behavior of these functions. 2. When system contains three user threads, I want to control Fiasco scheduler not to schedule one thread in these three threads during one time interval. How can I implement it? The simplest way seems to control this thread into un-running state. How can I achieve this by a supervisal server? I'm sorry for my poor English and lengthy question. I'm glad if you give me some hints or corrections. Thanks a lot! Best Regards, Sean

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The behavior of scheduler in L4Linux on ARM architecture
by Sean 21 May '09

21 May '09

Dear Now I am studying the scheduler design issue of DROPS including Fiasco and L4Linux. In the reference document, "L4Linux Porting Optimizations", it said that " In an L4Linux system two schedulers are active. One is in the L4 kernel scheduling all L4 threads including L4Linux processes. The L4 scheduler uses static priorities and schedules threads with the same priority round-robin. The other scheduler is in the Linux server, deciding which Linux process to run next. L4Linux is designed in a way that from the view of the Linux server multiple user processes can be running in the L4 system. Furthermore, the Linux scheduler can only consider those processes that are blocked in the server. Consequently, the Linux server needs to distinguish between user processes being served by the Linux server and the ones running." For the behavior of the scheduler in L4Linux, I got some questions below. 1. In L4Linux, the process/thread will map to several L4 Threads. How the scheduler in the Linux Server considers user processes in L4Linux whether to execute in L4 system ? According to the document, does L4Linux scheduler only control the user process whether block or not? 2. Based on the L4Linux source code from currently SVN, the behavior of schedule() function (kernel/sched.c line 4546) is => If next != prev, call context_switch() function => In context_switch() function (kernel/sched.c Line 2649), it calls architecture dependent function switch_to() => In switch_to() function (arch/l4/include/asm/arch-arm/system.h Line 222), it calls l4x_switch_to() function and __switch_to() function => In l4x_switch_to() function (arch/l4/kernel/arch-arm/dispatch.c Line 170), it logs the message to Trace Buffer of Fiasco and set l4x_current_process => In __switch_to() function (arch/l4/kernel/arch-arm/switch_to.S Line 5), it store the registers to CPU context of thread_info and load all regs saved previously Based on the source code analysis, it seems that when the L4Linux scheduler decide to do the context switch, the architecture dependent function __switch_to() will do the register restore and load. According to the document, I think the behavior here should set the corresponding thread status of prev and next user process to block or unblock these L4 threads. But here it does low level register restore and reload operations to change the current running process directly. It confuses me. Can anyone give me any ideas to address this? Thanks a lot! Best Regards, Sean

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time problem
by fang zhengshu 19 May '09

19 May '09

hi all, I write a simple test example about time function.but when I use the "time()" function,the code can not be compiled correctly. I just have include the <time.h>,any question? the error I put following: l4@192:~/tudos/l4/pkg/test_fifo/examples/client$ make PWD=/home/l4/tudos/build/pkg/test_fifo/examples/client/OBJ-x86_586-l4v2 make -C /home/l4/tudos/build/pkg/test_fifo/examples/client/OBJ-x86_586-l4v2 -f Makefile make[1]: Entering directory `/home/l4/tudos/build/pkg/test_fifo/examples/client/OBJ-x86_586-l4v2' ... Compiling main.o LD_PRELOAD=/home/l4/tudos/build/tool/gendep/libgendep.so GENDEP_TARGET=main.o GENDEP_BINARY=cc1 gcc -m32 -c -DUSE_UCLIBC=y -DRAM_BASE=0x0 -DSYSTEM_x86_586_l4v2 -DARCH_x86 -DCPUTYPE_586 -DL4API_l4v2 -DCONFIG_L4_CALL_SYSCALLS -DCONFIG_L4_ABS_SYSCALLS -I/home/l4/tudos/build/pkg/test_fifo/idl/OBJ-x86-l4v2 -I/home/l4/tudos/build/include/x86/l4v2 -I/home/l4/tudos/build/include/l4v2 -I/home/l4/tudos/build/include/x86 -I/home/l4/tudos/build/include -I/home/l4/tudos/l4/../dice/include -I/home/drops/include/x86/l4v2 -I/home/drops/include/l4v2 -I/home/drops/include/x86 -I/home/drops/include -nostdinc -I/home/l4/tudos/build/include/x86/uclibc -I/home/l4/tudos/build/include/uclibc -I/home/l4/tudos/build/include/uclibc++ -I/home/drops/include/x86/uclibc -I/home/drops/include/uclibc -I/home/drops/include/uclibc++ -I/usr/lib/gcc/i486-linux-gnu/4.2.4/include -I/usr/lib/gcc/i486-linux-gnu/4.2.4/include-fixed -gstabs+ -g -O2 -fno-strict-aliasing -march=i586 -Wall -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -fno-common -fno-stack-protector /home/l4/tudos/l4/pkg/test_fifo/examples/client/main.c -o main.o ==> Linking test_fifo-client LD_PRELOAD=/home/l4/tudos/build/tool/gendep/libgendep.so GENDEP_TARGET=test_fifo-client GENDEP_BINARY=ld GENDEP_BINARY_ALT1=ld ld -m elf_i386 -o test_fifo-client /home/l4/tudos/build/lib/x86_586/crt0.o main.o test-client.o -Ttext=0x1100000 --hash-style=sysv -L/home/l4/tudos/build/lib/x86_586/l4v2 -L/home/l4/tudos/build/lib/x86_586 -L/home/l4/tudos/build/lib -L/home/drops/lib/x86_586/l4v2 -L/home/drops/lib/x86_586 -L/home/drops/lib -T/home/l4/tudos/build/lib/x86_586/main_stat.ld -static -lgeneric_ts -ll4env -ll4rm -ldm_generic -ldm_mem -lthread -lsemaphore -llogserver_capsule -lnames -ll4util_root -ll4util -lsigma0 -lroot -ll4env -ll4env_err -ll4rm -ldm_generic -ldm_mem -lthread -lslab -ll4sys -nostdlib -luc_c -luclibc_support -u mmap_anon -lc_be_simple_mem -lc_be_mmap -lc_be_mmap_util -lc_be_l4env_start_stop -lc_be_minimal_log_io -luc_be_simple_sleep -ll4env -llogserver_capsule -ll4rm -ldm_generic -ldm_mem -lthread -lgeneric_ts -luc_c /usr/lib/gcc/i486-linux-gnu/4.2.4/libgcc.a -luc_c -ll4sys -Ttext=0x1100000 --warn-common -gc-sections main.o: In function `main': /home/l4/tudos/l4/pkg/test_fifo/examples/client/main.c:36: undefined reference to `time' /home/l4/tudos/l4/pkg/test_fifo/examples/client/main.c:40: undefined reference to `time' /home/l4/tudos/l4/pkg/test_fifo/examples/client/main.c:36: undefined reference to `time' make[1]: *** [test_fifo-client] Error 1 make[1]: Leaving directory `/home/l4/tudos/build/pkg/test_fifo/examples/client/OBJ-x86_586-l4v2' make: *** [/home/l4/tudos/build/pkg/test_fifo/examples/client/OBJ-x86_586-l4v2] Error 2 I have search the same error in l4-hackers ,someone suggest use rtc server,I think it's a good idea.but I have found that the time() function in time.h,why the error will happen? The reason I just include time.h? Thank you! -- fang,

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USB Smartcard reader unter L4Linux
by Gianfranco Ricci 18 May '09

18 May '09

Hello l4hackers! I'm trying to set up an L4Linux environment in which a USB smartcard reader [ReinerSCT cyberjack e-com(a) ] can be used but I'm encountering problems. I'm using: L4Linux 2.6.22 with complete USB support libusb 1.0 usbutils 0.11 Driver 3.3.2Beta3 for the smartcard reader PCSC-lite 1.53 The problem is that the driver could not be loaded (into USB userspace). Maybe the libusb (compiled under Linux 2.6.25) is not complete compatible with L4Linux 2.6.22. Using Blockdevices such exernal Harddisks is possible, so USB support in general should be okay. Executing "lsusb" don't show ANY USB device. Only "lsusb -t" shows a correct result in which my cardreader is listed. Other parameter have the same output as "lsusb". Bus# 7 `-Dev# 1 Vendor 0x0000 Product 0x0000 Bus# 6 `-Dev# 1 Vendor 0x0000 Product 0x0000 Bus# 5 `-Dev# 1 Vendor 0x0000 Product 0x0000 Bus# 4 `-Dev# 1 Vendor 0x0000 Product 0x0000 `-Dev# 2 Vendor 0x0c4b Product 0x0400 << my smartcard reader Bus# 3 `-Dev# 1 Vendor 0x0000 Product 0x0000 |-Dev# 2 Vendor 0x0a5c Product 0x2110 `-Dev# 3 Vendor 0x0483 Product 0x2016 Bus# 2 `-Dev# 1 Vendor 0x0000 Product 0x0000 Bus# 1 `-Dev# 1 Vendor 0x0000 Product 0x0000 `-Dev# 5 Vendor 0x04b3 Product 0x4485 `-Dev# 6 Vendor 0x046d Product 0xc03e Using "cat /proc/bus/usb/devices" shows ALL devices (here listed only my smartcard reader) T: Bus=04 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0c4b ProdID=0400 Rev= 0.01 S: Manufacturer=Reiner-SCT S: Product=cyberJack e-com(a) S: SerialNumber=1776760900 C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr= 96mA I:* If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none) // Driver=usbfs under Linux after starting pcsc!!! E: Ad=83(I) Atr=03(Int.) MxPS= 64 Ivl=5ms E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms When i try so start PCSC-Lite which should load the ReinerSCT driver the syslog tells: May 12 14:25:51 (none) user.info pcscd: hotplug_libhal.c:307:get_driver() Looking a driver for VID: 0x0C4B, PID: 0x0400 May 12 14:25:51 (none) user.info pcscd: hotplug_libhal.c:342:HPAddDevice() Adding USB device: usb_device_c4b_400_1776760900_if0 May 12 14:25:52 (none) user.info pcscd: readerfactory.c:1024:RFInitializeReader() Attempting startup of REINER SCT CyberJack ecom_a (1776760900) 00 00 using /usr/lib/pcsc/drivers/ifd-cyberjack.bundle/Contents/Linux/ifd-cyberjack.so May 12 14:25:52 (none) user.info pcscd: readerfactory.c:877:RFBindFunctions() Loading IFD Handler 3.0 May 12 14:26:10 (none) user.info pcscd: readerfactory.c:1050:RFInitializeReader() Open Port 200000 Failed (usb:0c4b/0400:libhal:/org/freedesktop/Hal/devices/usb_device_c4b_400_1776760900_if0) May 12 14:26:10 (none) user.info pcscd: readerfactory.c:914:RFUnloadReader() Unloading reader driver. May 12 14:26:10 (none) user.info pcscd: readerfactory.c:233:RFAddReader() REINER SCT CyberJack ecom_a (1776760900) init failed. May 12 14:26:10 (none) user.info pcscd: hotplug_libhal.c:397:HPAddDevice() Failed adding USB device: usb_device_c4b_400_1776760900_if0 and debug output from ReinerSCT driver: CTAPI :[00000402]:2009/04/12 14:26:04:590976:[LOG]:ctapi.cpp:init:334:Initialised CTAPI library (3.3.2.0/7.0.0) CTAPI :[00000402]:2009/04/12 14:26:04:590976:[LOG]:ctapi.cpp:_init_common1:424:ctn=0, pn=0, devName=usb:0c4b/0400:libhal:/org/freedesktop/Hal/devices/usb_device_c4b_400_1776760900_if0 CTAPI :[00000402]:2009/04/12 14:26:04:650977:[LOG]:ctapi.cpp:_init_common1:605:Device path is: [usb:0c4b/0400:libhal:/org/freedesktop/Hal/devices/usb_device_c4b_400_1776760900_if0] [trying several times (5sec)] COMIN :[00000402]:2009/04/12 14:26:04:650977:[<USB>]:ausb.c: 308: Looking for HAL device COMIN :[00000402]:2009/04/12 14:26:04:650977:[<USB>]:ausb.c: 383: Looking for device at 004/002 COMIN :[00000402]:2009/04/12 14:26:04:650977:[<USB>]:ausb.c: 386: Device not found COMIN :[00000402]:2009/04/12 14:26:10:711068:[<USB>]:ausb.c: 426: Device [usb:0c4b/0400:libhal:/org/freedesktop/Hal/devices/usb_device_c4b_400_1776760900_if0] not found within 5 secs, giving up COMERR:[00000402]:2009/04/12 14:26:10:711068:[<USB>]:Device not found CTAPI :[00000402]:2009/04/12 14:26:10:711068:[LOG]:ctapi.cpp:_init_common1:711:Unable to connect device 0 [usb:0c4b/0400:libhal:/org/freedesktop/Hal/devices/usb_device_c4b_400_1776760900_if0]: -1 CTAPI :[00000402]:2009/04/12 14:26:10:711068:[LOG]:ctapi.cpp:fini:348:Deinitializing CTAPI library IFD :[00000402]:2009/04/12 14:26:10:711068:[LOG]:ifdhandler.c:IFDHCreateChannelByName:243:-127=CT_init_name(0,usb:0c4b/0400:libhal:/org/freedesktop/Hal/devices/usb_device_c4b_400_1776760900_if0) Has anyone experience using a smartcard reader (or a usb device using userspace driver under L4Linux) ? Could the problem be the libusb compiled under Linux? Has anyone an other idea where the problem could come from? Thanks in advance! Gianfranco

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USB for L4
by mx＠sven-fuelster.com 11 May '09

11 May '09

Hi, I'm just reading Dirk Vogt's thesis about 'USB for the L4 Environment' and I'd like to check out the corresponding code. I'm afraid it's not included in your svn-tree - is there any chance to obtain it? Kind regards Sven

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Warning from ORe stub driver
by Alexander Valitov 03 May '09

03 May '09

Hi, When I use L4Linux ORe stub driver it constantly prints these warnings: l4lx | eth0: buffer too small (1) l4lx | eth0: buffer too small (1) l4lx | eth0: buffer too small (1) What does it mean? How can I fix it? Best Regards, Alexander Valitov -- View this message in context: http://www.nabble.com/Warning-from-ORe-stub-driver-tp22827840p22827840.html Sent from the L4 mailing list archive at Nabble.com.

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Re: Do L4 Fiasco microkernel support multicore processor?
by Neohtm 03 May '09

03 May '09

> > > > Hi, > > On Wed Apr 22, 2009 at 11:40:31 +0800, Neohtm wrote: > > I would like to know whether the Fiasco microkernel is able to run on > > multicore processor such as Intel Core 2 Duo or Quad Core??? > > I want to try to compile the Fiasco + DOpE + L4Linux to run on it. > > >It will run there (albeit only use one CPU in the current version). So, Fiasco is able to detect the multicore platform and use the first core (CPU0) ? In that case, is it possible to launch the L4Linux in another specific core of the processor by adding kernel command (-nosmp, -isolcpus ) in l4linux26.cfg? > > > > > >Adam > -- > >Adam adam(a)os.inf.tu-dresden.de > > Lackorzynski http://os.inf.tu-dresden.de/~adam/ > > > > ------------------------------ > > _______________________________________________ > l4-hackers mailing list > l4-hackers(a)os.inf.tu-dresden.de > http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers > > > End of l4-hackers Digest, Vol 72, Issue 27 > ****************************************** >

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