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2306 discussions

Open vSwitch possible use, thoughts
by Lonnie Cumberland 07 Apr '14

07 Apr '14

Greetings All, I hope that everyone is doing well today. Currently, I am working my way through NOVA+Genode+VirtualBox with good success thus far, but still a long ways to go as I would like to implement the Sigma0 and Tutor (from the old NOVA 0.3 Demo) under Genode in the Nitpicker GUI. While being able to boot the VirtualBox VMM and also knowing that networking is still under development, I searched around and came a cross, what I think might be a "possible" good solution. I found Open vSwitch (http://openvswitch.org/) and wanted to see what your thought were on this as it might be a good solution to allow for multiple VirtualBox VM's to be running under NOVA & Genode. Any thoughts on this? Kind Regards and have a great day, Lonnie

2 4

Creating your first Genode application - Build succesful, but execution fails
by Wolfgang Schmidt 05 Apr '14

05 Apr '14

Hello, I tried to run the genode tutorial. I first installed it on an AMD Athlon x64 with nForce4- Mainboard. run/demo stopped there after init -> nitpicker] create session with args: label="launchpad", ram_quota=12288 I made a second try on a) a virtualBox machine with brand new installation of Unbuntu 12.04 x64 (git) and b) an old Evo N610c Pentium 4 with Ubuntu 12.04 x86 (14.02 from tar.gz of latest releases) I think a few Steps are missing within the Step-By-Step tutorial http://genode.org/documentation/developer-resources/client_server_tutorial As a prestep for “Setting up the build environment” i created a new build directory with './tool/create_builddir linux_x86 BUILD_DIR=build.hello'. As i did not have a lot of files in it, I tried a first ‘make’. In build/etc/build.conf I added REPOSITORIES += $(GENODE_DIR)/hello_testIn the bin directory i created a new config directory with config file. The server section seems to have only one .h file, I put the three listings in one main.cc file (as later in the document it is mentioned that in target.mk SCR_CC = main.cc an obviously no includes to the other files are given). Afterwards i tried ‘make hello’ which returned no error. With ‘cd run’, ‘./core’ only the following output appered: |int main(): --- create local services --- |int main(): --- start init --- |int main(): transferred 17592186044415 MB to init |int main(): --- init created, waiting for exit condition --- |[init] _map_local: lx_mmap failed (addr_in=0,addr_out=ffffffffffffffed/-19) overmap=0 |[init] C++ runtime: Genode::Rm_session::Region_conflict |[init] void* abort(): abort called If i try to run it again with dmesg the follwoing output appears: [ 4774.659901] core[12189]: segfault at 7f2ed162e068 ip 00000000010310c9 sp 00000000400ffce0 error 4 in core[1000000+5b000] (equal if i try git verison or archive version) I also tried to point the repository to the already existing hello_tutorial, but get the same result. --------------------------------------------------------------------------------------- I also tried the following: - created a new Ubuntu 12.04 VM. - Installed prerequisites sudo -s make -v ->GNU Make 3.81 apt-get install libSDL-dev apt-get install tk8.5 tcl8.5 apt-get install expect apt-get install byacc apt-get install qemu apt-get install genisoimage - Toolchain tar xPfj genode-toolchain-12.11-x86_64.tar.bz2 - either extracted 14.02 or used git (tried both) tar -xfc genode-14.02.tar.bz2 - Build essentials apt-get install build-essential Prepared NOVA - In base-nova : make prepare - In libports : make prepare PKG=x86emu -created a new build directory: ./tool/create_builddir nova_x86_32 BUILD_DIR=build.hellonova - in build.hellonova: make kernel - from : http://genode.org/documentation/developer-resources/build_system (Please note that the hello.run script does not contain kernel-specific information. Therefore it can be executed from the build directory of any base platform by using:) : make run/hello - Error: No run script - Added in build.conf REPOSITORIES += $(GENODE_DIR)/hello_tutorial - make run/hello -> [init -> hello_server] Hello::Root_component::Root_component(Genode::Rpc_entrypoint*, Genode::Allocator*): Creating root component. [init -> hello_server] virtual Hello::Session_component* Hello::Root_component::_create_session(const char*): creating hello session. [init] hello_client: no route to service "Timer" [init -> hello_client] C++ runtime: Genode::Parent::Service_denied - In hello_tutorial/config/config added the following to config:: (http://genode.org/documentation/developer-resources/client_server_tutorial) <parent-provides> <service name="CAP"/> <service name="LOG"/> <service name="RM"/> </parent-provides> <default-route> <any-service> <parent/> <any-child/> </any-service> </default-route> Changed also the quantumto 1M in the directory( https://www.mail-archive.com/genode-main@lists.sourceforge.net/msg01343.html ) - make cleanall , make run/hello –> same problem - tried also to change route directly ( http://genode.org/documentation/developer-resources/init ) <route> <any-service> <parent/> <any-child/> </any-service> </route> - make cleanall , make run/hello –> same problem - Copied config file to build.hellonova/bin/config - make cleanall , make run/hello –> same problem - changed /hello_tutorial/run/hello.run Added: <start name="timer"> <resource name="RAM" quantum="1M"/> <provides><service name="Timer"/></provides> </start> (in this file there was only client/server) - make cleanall , make run/hello –> same problem I tried to update the repository with a git pull. Now something changed... -> [init] timer: no route to service "IO_PORT" I now see that in the helo.run there is also a line <service name="SIGNAL"/> What else could be needed to be changed? And for what is the config file in hello_tutorial_config? Best regards Wolfgang Schmidt ------------------- Output of: make run/hello using run script /home/wolfgang/genode/base-nova/run/env using run script /home/wolfgang/genode/hello_tutorial/run/hello.run building targets: core init hello drivers/timer spawn make core init hello drivers/timer make[1]: Betrete Verzeichnis '/home/wolfgang/genode/build.hellonova' checking library dependencies... Library platform MERGE platform.lib.a Library cxx COMPILE exception.o COMPILE guard.o COMPILE malloc_free.o COMPILE misc.o COMPILE new_delete.o COMPILE unwind.o MERGE supc++.o CONVERT supc++.o MERGE cxx.lib.a Library syscall MERGE syscall.lib.a Library startup COMPILE _main.o ASSEMBLE crt0.o COMPILE init_main_thread.o MERGE startup.lib.a Library base-common COMPILE allocator/allocator_avl.o COMPILE allocator/slab.o COMPILE avl_tree/avl_tree.o COMPILE child/child.o COMPILE console/console.o COMPILE elf/elf_binary.o COMPILE env/cap_map.o COMPILE heap/heap.o COMPILE heap/sliced_heap.o COMPILE ipc/ipc.o COMPILE ipc/pager.o COMPILE lock/lock.o COMPILE pager/x86_32/pager.o COMPILE process/process.o COMPILE server/server.o COMPILE signal/common.o COMPILE signal/signal.o COMPILE thread/context_allocator.o COMPILE thread/thread.o COMPILE thread/thread_context.o COMPILE thread/trace.o MERGE base-common.lib.a Library base COMPILE console/log_console.o COMPILE env/context_area.o COMPILE env/env.o COMPILE env/reinitialize.o COMPILE thread/thread_nova.o MERGE base.lib.a Library alarm COMPILE alarm.o MERGE alarm.lib.a Library timer COMPILE main.o MERGE timer.lib.a Program drivers/timer/timer COMPILE empty.o LINK timer Program hello/client/hello_client COMPILE main.o LINK hello_client Program hello/server/hello_server COMPILE main.o LINK hello_server Library init_pd_args COMPILE pd_args.o MERGE init_pd_args.lib.a Library config COMPILE config.o MERGE config.lib.a Program init/init COMPILE main.o LINK init Program core/core COMPILE context_area.o COMPILE core_mem_alloc.o COMPILE core_printf.o COMPILE core_rm_session.o COMPILE cpu_session_component.o COMPILE cpu_session_extension.o COMPILE cpu_session_support.o COMPILE dataspace_component.o COMPILE dump_alloc.o COMPILE echo.o COMPILE io_mem_session_component.o COMPILE io_mem_session_support.o COMPILE io_port_session_component.o COMPILE irq_session_component.o COMPILE main.o COMPILE pager.o COMPILE pd_session_component.o COMPILE pd_session_extension.o COMPILE platform.o COMPILE platform_pd.o COMPILE platform_services.o COMPILE platform_thread.o COMPILE ram_session_component.o COMPILE ram_session_support.o COMPILE rm_session_component.o COMPILE rm_session_support.o COMPILE rom_session_component.o COMPILE signal_session_component.o COMPILE signal_source_component.o COMPILE thread_start.o COMPILE trace_session_component.o LINK core make[1]: Verlasse Verzeichnis '/home/wolfgang/genode/build.hellonova' genode build completed building targets: kernel spawn make kernel make[1]: Betrete Verzeichnis '/home/wolfgang/genode/build.hellonova' checking library dependencies... Program kernel/hypervisor COMPILE acpi.o COMPILE acpi_dmar.o COMPILE acpi_fadt.o COMPILE acpi_hpet.o COMPILE acpi_madt.o COMPILE acpi_mcfg.o COMPILE acpi_rsdp.o COMPILE acpi_rsdt.o COMPILE acpi_table.o COMPILE avl.o COMPILE bootstrap.o COMPILE buddy.o COMPILE cmdline.o COMPILE console.o COMPILE console_serial.o COMPILE console_vga.o COMPILE counter.o COMPILE cpu.o COMPILE dmar.o COMPILE ec.o COMPILE ec_exc.o COMPILE ec_svm.o COMPILE ec_vmx.o COMPILE entry.o COMPILE fpu.o COMPILE gdt.o COMPILE gsi.o COMPILE hip.o COMPILE hpet.o COMPILE hpt.o COMPILE idt.o COMPILE init.o COMPILE ioapic.o COMPILE keyb.o COMPILE lapic.o COMPILE mca.o COMPILE mdb.o COMPILE memory.o COMPILE mtrr.o COMPILE pci.o /home/wolfgang/genode/base-nova/contrib/src/pci.cpp: In constructor ‘Pci::Pci(unsigned int, unsigned int)’: /home/wolfgang/genode/base-nova/contrib/src/pci.cpp:41:51: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] COMPILE pd.o COMPILE pt.o COMPILE pte.o COMPILE rcu.o COMPILE regs.o COMPILE sc.o COMPILE slab.o COMPILE sm.o COMPILE space_mem.o COMPILE space_obj.o COMPILE space_pio.o COMPILE start.o COMPILE string.o COMPILE svm.o COMPILE syscall.o COMPILE tss.o COMPILE utcb.o COMPILE vmx.o COMPILE vtlb.o LINK hypervisor make[1]: Verlasse Verzeichnis '/home/wolfgang/genode/build.hellonova' genode build completed using NOVA kernel at /home/wolfgang/genode/build.hellonova/kernel/hypervisor creating ISO image... Warning: -follow-links does not always work correctly; be careful. Size of boot image is 4 sectors -> No emulation Total translation table size: 2048 Total rockridge attributes bytes: 2228 Total directory bytes: 8192 Path table size(bytes): 64 Max brk space used 1c000 1885 extents written (3 MB) spawn qemu-system-x86_64 -no-kvm -cpu core2duo -nographic -cdrom var/run/hello.iso NOVA Microhypervisor v6-ccc670a (x86_32): Apr 5 2014 14:24:53 [gcc 4.7.2] [ 0] CORE:0:0:0 6:f:b:0 [0] Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz Hypervisor does not feature VMX Hypervisor does not feature SVM Hypervisor reports 1x1 CPU - boot CPU is 0 Hypervisor info page contains 13 memory descriptors: detected physical memory: 0x0000000000000000 - size: 0x9f400 use physical memory: 0x0000000000000000 - size: 0x9f000 detected physical memory: 0x0000000000100000 - size: 0x17efd000 use physical memory: 0x0000000000100000 - size: 0x17efd000 map multi-boot module: physical 0x17db9000 -> [0x001c5000-0x0028ad44) - core map multi-boot module: physical 0x17e7f000 -> [0x00002000-0x00002235) - config map multi-boot module: physical 0x17e80000 -> [0x00006000-0x00071450) - init map multi-boot module: physical 0x17eec000 -> [0x00075000-0x000cba54) - hello_client map multi-boot module: physical 0x17f43000 -> [0xb0000000-0xb005a278) - hello_server map multi-boot module: physical 0x17f9e000 -> [0x0028e000-0x002eccdc) - timer :virt_alloc: Allocator 186814 dump: Block: [00002000,00004000) size=00002000 avail=00000000 max_avail=00000000 Block: [00004000,00005000) size=00001000 avail=00000000 max_avail=00000000 Block: [00005000,00006000) size=00001000 avail=00000000 max_avail=00000000 Block: [00006000,00073000) size=0006d000 avail=00000000 max_avail=00000000 Block: [00073000,00074000) size=00001000 avail=00000000 max_avail=00000000 Block: [00074000,00075000) size=00001000 avail=00000000 max_avail=00000000 Block: [00075000,000cd000) size=00058000 avail=00000000 max_avail=00000000 Block: [000cd000,000ce000) size=00001000 avail=00000000 max_avail=00000000 Block: [000ce000,000cf000) size=00001000 avail=00000000 max_avail=9fd12000 Block: [000cf000,000d0000) size=00001000 avail=00000000 max_avail=00000000 Block: [000d0000,000d1000) size=00001000 avail=00000000 max_avail=00000000 Block: [000d1000,000d2000) size=00001000 avail=00000000 max_avail=0002c000 Block: [000d2000,000d3000) size=00001000 avail=00000000 max_avail=00000000 Block: [000d3000,000d4000) size=00001000 avail=00000000 max_avail=00000000 Block: [000d4000,00100000) size=0002c000 avail=0002c000 max_avail=0002c000 Block: [001c5000,0028c000) size=000c7000 avail=00000000 max_avail=00000000 Block: [0028c000,0028d000) size=00001000 avail=00000000 max_avail=9fd12000 Block: [0028d000,0028e000) size=00001000 avail=00000000 max_avail=00000000 Block: [0028e000,002ee000) size=00060000 avail=00000000 max_avail=9fd12000 Block: [002ee000,a0000000) size=9fd12000 avail=9fd12000 max_avail=9fd12000 Block: [b0000000,b005c000) size=0005c000 avail=00000000 max_avail=9fd12000 Block: [b005c000,bfeff000) size=0fea3000 avail=0fea3000 max_avail=0fea3000 Block: [bff04000,bfffd000) size=000f9000 avail=000f9000 max_avail=000f9000 => mem_size=2951942144 (2815 MB) / mem_avail=2949488640 (2812 MB) :phys_alloc: Allocator 1857b8 dump: Block: [00001000,00002000) size=00001000 avail=00000000 max_avail=00000000 Block: [00002000,00003000) size=00001000 avail=00000000 max_avail=00000000 Block: [00003000,00004000) size=00001000 avail=00000000 max_avail=00000000 Block: [00004000,00005000) size=00001000 avail=00000000 max_avail=00000000 Block: [00005000,00006000) size=00001000 avail=00000000 max_avail=00000000 Block: [00006000,00007000) size=00001000 avail=00000000 max_avail=155b9000 Block: [00007000,00008000) size=00001000 avail=00000000 max_avail=00000000 Block: [00008000,00009000) size=00001000 avail=00000000 max_avail=00000000 Block: [00009000,0000a000) size=00001000 avail=00000000 max_avail=00000000 Block: [0000a000,0000b000) size=00001000 avail=00000000 max_avail=00093000 Block: [0000b000,0000c000) size=00001000 avail=00000000 max_avail=00000000 Block: [0000c000,0009f000) size=00093000 avail=00093000 max_avail=00093000 Block: [00100000,00101000) size=00001000 avail=00000000 max_avail=155b9000 Block: [00101000,00102000) size=00001000 avail=00000000 max_avail=00000000 Block: [00102000,00400000) size=002fe000 avail=002fe000 max_avail=155b9000 Block: [02800000,17db9000) size=155b9000 avail=155b9000 max_avail=155b9000 => mem_size=362115072 (345 MB) / mem_avail=362061824 (345 MB) :io_mem_alloc: Allocator 187870 dump: Block: [00000000,00001000) size=00001000 avail=00001000 max_avail=00001000 Block: [0009f000,00100000) size=00061000 avail=00061000 max_avail=00061000 Block: [00400000,02800000) size=02400000 avail=02400000 max_avail=e8246000 Block: [17db9000,fffff000) size=e8246000 avail=e8246000 max_avail=e8246000 => mem_size=3932848128 (3750 MB) / mem_avail=3932848128 (3750 MB) int main(): --- create local services --- int main(): --- start init --- int main(): transferred 344 MB to init int main(): --- init created, waiting for exit condition --- [init] Could not open file "ld.lib.so" [init] timer: no route to service "IO_PORT" [init -> hello_server] Hello::Root_component::Root_component(Genode::Rpc_entrypoint*, Genode::Allocator*): Creating root component. [init -> hello_server] virtual Hello::Session_component* Hello::Root_component::_create_session(const char*): creating hello session. [init -> timer] C++ runtime: Genode::Parent::Service_denied [init -> timer] void* abort(): abort called Expect: 'interact' received 'strg+c' and was cancelled

1 0

dde-linux, musb driver code page faults in Routine:Main
by Bob Stewart 04 Apr '14

04 Apr '14

I'm porting the musb driver code from Linux, using the 14.02 release of Genode. Basically, I'm using the main.cc code in dde-linux/src/lib/usb to start the usb subsystem and usb port drivers. The main.cc code is essentially unchanged and the start_usb_driver function is identical to the release code. When running the executible containing this code a page fault occurs when _run is called in Routine::main(). The reason appears to be the schedule() function returns a pointer to 0x0 it got from _next which was returned from _list. The pointer in in _list appears to have been removed at the start main(). It looks to me like the code in main.cc in src/lib/usb would fail for any usb driver code. What am I missing? Thanks, Bob Stewart

2 5

genode on pandaboard
by Alif Hamka 04 Apr '14

04 Apr '14

hello, my name is alif, I'm from Computer Engineering, EEPIS. I just start learning about gnode and really interested about this framework. What I want to ask is I've interested with this article http://genode.org/documentation/articles/pandaboard I've download and unpack the image onto my SD Card. Is there any steps before I can boot this image on my pandaboard? I've tried using minicom just like when using linux on pandaboard. But it won't initialized. Please help me.

3 6

Genode on Android
by Alif Hamka 02 Apr '14

02 Apr '14

I've read in this page that android has been able to put on top of genode http://genode.org/news/android-on-top-of-genode I'm really interested about this, furthermore I'm really interested in everything about genode that used to build embedded OS (such as pandaboard and android). Is there any documentation or tutorial about making android on top of genode? In the webpage above written "For those of you who are eager to experiment with L4Android on Genode, please find further information at the top-level README file of the ports-foc repository" but when I clicked the link I was redirected to http://sourceforge.net/p/genode/code/HEAD/tree/ instead. So I don't know where I should start my work Best Regards Alif

2 2

Re: Some questions about performance optimization related to GUIframework on Genode
by Kloisiie 30 Mar '14

30 Mar '14

Dear Norman, Thank you for spending much time on answering my problems. Maybe I should consider the time cost of using DoPE on Genode, because my work should be finished before February, 2015. Then my answers are given below: * Which version of Genode are you using? We're using version 13.02. * Are you using Qt4 or Qt5? (If you are still using Qt4, I would recommend you to switch to Qt5) Qt 4.7.4 was using. I tried to replace Qt4 with Qt5, but failed. The reason maybe the ways I used are wrong because of my lack of knowledge about that. So, could you give me some tips or tutorial about Qt4's updating to Qt5? Sorry to bother you, Norman. * Which Genode base platform are you using? Fiasco.OC, because our prototype and research are all based on microkernel architecture till now. * Have you tried to run your GUI application on base-linux? If yes, have you compared its performance to the same application compiled for native Linux w/o Genode? I would like to carry some experiments before giving an answer to you. * On base-linux, you could use normal Linux profiling tools such as oprofile to find out where the CPU time goes. It's good way, but I should consider how to make sure that Fiasco.OC-based Genode's performance is improved. * Can you make a Git branch with your application publicly available (e.g., on Github) so that I could give it a try? By being able to reproduce the problem, I could help you much better with investigating the issue. I'm so sorry for being not able to do this, because parts of source code of our prototype could not be public. I really appreciate you help, and if some day our team leader agree to open source code to the public, I would like to invite you to our team. Thank you for all your assistance. Yours Sincerely, Shuo Wang University of Chinese Academy of Sciences. ------------------ Original ------------------ From: "norman.feske";<norman.feske@...1...>; Date: Thu, Mar 27, 2014 09:45 PM To: "genode-main"<genode-main(a)lists.sourceforge.net>; Subject: Re: Some questions about performance optimization related to GUIframework on Genode Hello Shuo Wang, thank you for your interest in Genode! Please excuse the delayed response. I was offline for a few days. > The most serious problem I meet now is that system is very slow when > running applications we made before, so I doubt whether this is related > to GUI framework. I plan to transplant DoPE to Genode, in order to make > a comparation between DoPE and Qt. But I am worried about reasonability > about my design of experiments, so I need help from the developers. DOpE is definitely faster than Qt as it is even usable on low-performance devices such as FPGA softcores, e.g., the Milkymist SoC [1]. So for those kind of special-purpose appliances, DOpE still seems to be attractive. However, in the context of the Genode OS framework, I would advise against using DOpE. I would rather spend the energy on investigating the performance problems you observe with Qt. [1] http://m-labs.hk/m1.html The reason for my stance is that DOpE lacks a lot of features that are universally expected from modern GUI toolkits (e.g., support for theming, international characters, common widget types like menus). Furthermore, it has been practically unmaintained for several years now. If you still like to go forward with experimenting with DOpE on Genode, I can possibly assist you. I already ported DOpE to an early version of Genode in 2008 and could possibly revive the port. However, I am not committed to actively maintain or even improve it. As I said above, I would rather try to find out why Qt performs so badly for you. This raises the following questions: * Which version of Genode are you using? * Are you using Qt4 or Qt5? (If you are still using Qt4, I would recommend you to switch to Qt5) * Which Genode base platform are you using? * Have you tried to run your GUI application on base-linux? If yes, have you compared its performance to the same application compiled for native Linux w/o Genode? * On base-linux, you could use normal Linux profiling tools such as oprofile to find out where the CPU time goes. * Can you make a Git branch with your application publicly available (e.g., on Github) so that I could give it a try? By being able to reproduce the problem, I could help you much better with investigating the issue. Best regards Norman -- Dr.-Ing. Norman Feske Genode Labs http://www.genode-labs.com · http://genode.org Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth ------------------------------------------------------------------------------ _______________________________________________ Genode-main mailing list Genode-main(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-mai

2 1

The mouse cannot work when I ran demo
by Sun Keqin 29 Mar '14

29 Mar '14

Hi all, I met a problem when I ran "demo" on Ubuntu which installed on MACBOOK PRO with VMWare Fusion. The mouse didn't show up and the log printed below. I have tried to change the size of Ring_buffer but it didn't work. What should I do to fix that? Thanks Keqin [init -> launchpad] --- entering main loop --- [init -> ps2_drv] C++ runtime: Ring_buffer<unsigned char, 1024>::Overflow [init -> ps2_drv] void* abort(): abort called

3 3

Arbitrary msg!! "Thread failed"
by Aditya Kousik 28 Mar '14

28 Mar '14

Hello all, Two instances have cropped up. The base-hw kernel which loaded quite perfectly till two runs back suddenly fails to load. It does't even boot init anymore. It prints the error "failed to communicate thread event". This is very sudden and quite shocking. Could it be a h/w fault? Prior to this, we ran a sample gpio led blinking program. The board itself seems to have been bricked/unresponsive. But, a simple printf program itself fails to load. What could be the issue? Thanks Aditya.

1 1

Some questions about performance optimization related to GUI framework on Genode
by Kloisiie 27 Mar '14

27 Mar '14

Dear Norman and every scientists and engineers from Genode project, I'm doing a research on performance optimization of our team's verified security operating system project. Our prototype is based on Genode, and we add some security modules to implement a secure operating system. The most serious problem I meet now is that system is very slow when running applications we made before, so I doubt whether this is related to GUI framework. I plan to transplant DoPE to Genode, in order to make a comparation between DoPE and Qt. But I am worried about reasonability about my design of experiments, so I need help from the developers. Thank you for all your assistance. Yours Sincerely, Shuo Wang University of Chinese Academy of Sciences.

2 1

RM Session - attach() method
by Aditya Kousik 27 Mar '14

27 Mar '14

Hello, I understand that R/W accesses to physical space are made through the RM session. Is this sequence of events correct? 1. Create a Dataspace_capability. 2. Allocate a dataspace as env()->ram_session->alloc(size) which returns a dataspace_capability to the aforementioned DS. 3. Attach the dataspace as env()->rm_session()->attach(ds) which returns a void pointer having the virtual address pointing to the starting address of the dataspace. So if one were to write to this virtual address, it goes through the RM_session and eventually writes to the physical address. My question is, calling attach(ds) in one process and the same attach(ds) in another is going to return different virtual addresses. Will writing to these different (virtual) addresses give the same result? Is there a function that can be called to print what physical address is mapped to where? And can the contents of Dataspace_capability be printed in a readable form? Thanks and regards Aditya

2 1

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