l4-hackers June 2012

l4-hackers@os.inf.tu-dresden.de

23 participants
30 discussions

Startup help for L4Linux
by Andrej S 02 Jul '12

02 Jul '12

Hallo all, I'm absolutely new to L4 and need some startup help. I'm able to build Fiasco with L4Re and L4Linux, but I have no plan, how to bind them together. I miss some simple how-to, to get an instance of L4Linux on top of Fiasco like bootable image as well as how to run it under Fiasco-UX Can you provide some instructions and how-tos? Interesting papers and hints for development and debugging are welcome too. Thanking you in anticipation Andrej

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l4linux, making progress
by Ryan Brown 28 Jun '12

28 Jun '12

I've managed to get my l4linux build to start running, but it doesn't seem to get far: l4linux | libio: Warning: Finding 'icu' in system bus failed with 'No such object found' 4linux | PH 0 (t: 1) offs=00001000 vaddr=00400000 vend=005d1000 l4linux | phys=00400000 ephys=005d1000 l4linux | f_sz=001d0cb8 memsz=001d1000 flgs=r-x l4linux | PH 1 (t: 1) offs=001d2000 vaddr=005d1000 vend=00d36000 l4linux | phys=005d1000 ephys=00d36000 l4linux | f_sz=006c4c10 memsz=00765000 flgs=rw- l4linux | PH 2 (t: 4) offs=0015df14 vaddr=0055cf14 vend=0055cf38 l4linux | phys=0055cf14 ephys=0055cf38 l4linux | f_sz=00000024 memsz=00000024 flgs=--- l4linux | Starting binary at 0x400000, argc=3 argv=0x80007f9c *argv=0xb1007ff4 argv0=rom/vmlinuz l4linux | External resolver is at 0xa80006e0 l4linux | ======> L4Linux 2.6 starting... <======== l4linux | Linux version 3.0.0-l4-svn23 (ribrdb(a)ribox.sfo.corp.google.com) (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1) ) #10 Wed Jun 27 16:00:19 PDT 2012 l4linux | Binary name: rom/vmlinuz l4linux | Linux kernel command line (2 args): mem=200M console=ttyLv0 l4linux | Configuration checks disabled, you know what you're doing. l4linux | CPU mapping (l:p)[1]: 0:0 l4linux | Image: 00400000 - 00d36000 [9432 KiB]. l4linux | Areas: Text: 00400000 - 005d1000 [1860kB] (a bit longer) l4linux | Data: 005d1000 - 005edc60 [115kB] l4linux | Initdata: 005ef000 - 00c96000 [6812kB] l4linux | BSS: 00c96000 - 00d26000 [576kB] l4linux | gs=43 fs=43 l4linux | Device scan: l4linux | l4x_fiasco_gdt_entry_offset = 9 Then it just stops. What's happened here? Should I see more output? Or does the kernel output go somewhere else? I've compiled my kernel with an initramfs that does an "echo hello init" at the beginning of init, but I never see that. Do I need to worry about that 'icu' 'No such object found'? I tried adding a capability to icu for l4linux, but that didn't seem to help. Also, I'm having trouble getting my io config correct. IO prints out: io | Loading: config 'rom/l4lx-virtio.io' io | rom/l4lx-virtio.io:7.37-50: warning: could not find 'PCI/VEN_1AF4' but then later on I see: io | P6Device: S4__ "" io | Hw::Device[S4__] io | 0000:00:04.0: display controller [0] io | 0x1af4 0x1000 io | Red Hat, Inc Virtio network device io | IOPORT [0000000000c000-0000000000c03f 40] non-pref (32bit) (align=3f flags=4a03) io | IRQ [0000000000000b-0000000000000b 1] level high (32bit) (align=0 flags=104201) What's up with that? Here's my settings: modules.list: entry L4Linux-virtio kernel fiasco -serial_esc roottask moe rom/l4lx-virtio.cfg module l4re module ned module l4lx-virtio.cfg module io module rtc module x86-legacy.devs module l4lx-virtio.io module vmlinuz l4lx-virtio.cfg loader = L4.default_loader; bus_linux = loader:new_channel(); bus_rtc = loader:new_channel(); rtc_cap = loader:new_channel(); loader:start({ caps = { rom = rom; sigma0 = L4.cast(L4.Proto.Factory, L4.Env.sigma0):create(L4.Proto.Sigma0); l4linux = bus_linux:svr(); icu = L4.Env.icu; rtc_bus = bus_rtc:svr(); }, log = { "io", "red" }, }, "rom/io -vvvv rom/x86-legacy.devs rom/l4lx-virtio.io"); loader:start({ caps = { rom = rom; vbus = bus_rtc; rtc = rtc_cap:svr(); }, log = { "rtc", "green" }, }, "rom/rtc"); L4.default_loader:start( { caps = { log = L4.Env.log:m("rws"); vbus = bus_linux; rtc = rtc_cap; }, l4re_dbg = L4.Dbg.Warn, log = { "l4linux", "yellow" }, }, "rom/vmlinuz mem=200M console=ttyLv0 "); l4lx-virtio.io l4linux => new System_bus() { # Add a new virtual PCI root bridge PCI0 => new PCI_bus() { # Allow access to virtio devices. pci_l4x[] => wrap(hw-root.match("PCI/VEN_1AF4")); } }

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starting mag in l4con virtual console
by Valery V. Sedletski 28 Jun '12

28 Jun '12

hi, l4-hackers! I'm now experimenting with l4con from l4re. I found that now l4con is exporting the console access via Goos interface. And l4dope is started in Mag buffer. And equally, because l4con exports the same interface, it can be started in l4con virtual console. I tried that, it works perfectly. Then I tried the same with Mag in l4con buffer. -- It even starts, but the mouse isn't moving. I looked into Mag source, and discovered that Mag has plugins. But I have no idea how to use them. Can you give me a hint? Also, I found that there is two input plugins, one of them using event interface, other using libinput library. I suspect that I must to use the event one, but how? I start Mag the same way as DOpE. The single difference from the usual way of starting Mag is that vbus cap is missing (I gave the vbus cap to l4con, so, I think that Mag should not access input devices directly via vbus_input, but what instead?) So, I have the following output from Mag: [32mmag | libio: Warning: Query of 'vbus' failed![0m [32mmag | Hello from MAG[0m [32mmag | mapped frame buffer at 0x400000[0m [32mmag | View::Info:[0m [32mmag | flags: 0[0m [32mmag | size: 800x582 pos: 0, 0[0m [32mmag | bytes_per_line: 1600[0m [32mmag | buffer_offset: 0[0m [32mmag | RGBA(2): 5(11):6(5):5(0):0(0)[0m [32mmag | memory 400000-4e3580[0m [32mmag | L4INPUT native mode activated[0m [37ml4con | vc[4] 800x600@16, bpl:1600, gmode:0x0 save:1[0m [32mmag | L4INPUT: !!! W A R N I N G !!![0m [32mmag | L4INPUT: Please, do not use Fiasco's "-esc" with L4INPUT.[0m [32mmag | L4INPUT: !!! W A R N I N G !!![0m[32m[0m [32mmag | /media/os2l/var/src/genode/l4re/svn/l4/pkg/input/lib/src/init.c:110: failed l4input_internal_i8042_init(): -16[0m I found in the event input plugin source that it requires the "ev" cap. But where I can get it from? I start Mag this way: loader = L4.default_loader; ... local mag_svc = loader:new_channel(); -- Start mag loader:start( { caps = { fb = con_svc:create(L4.Proto.Goos, "g=800x600"); svc = mag_svc:svr(); }, l4re_dbg = L4.Dbg.Warn, log = {"mag", "green"}, }, "rom/mag"); Thanks in advance! WBR, valery

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RE: Re: Keeping track of the CPU time for a thread
by Mohammad A Haque 27 Jun '12

27 Jun '12

Thank you for your reply. Just to test the functionality, I tried a very simple thread. It computes a factorial for some number of iterations. void entry_point(void * param) { int num_run = 1000000; int number = 15; int fact; thread_t self = env()->self(); for(int i=0;i<num_run;i++) { fact = 1; for(int j = 2; j<= number; j++) { fact = fact * j; } } printf("Factorial of %d is : %d\n", number, fact); l4_thread_stats_time(self.cap()); printf("Consumed time: %llu\n",l4_utcb_mr()->mr[0]); } What I found is - the consumed time does not depend on the number of iterations (num_run) - I tried from 1 to a very large number. It does vary with the number. Am I missing something? Thanks again. ---------------------------------------------------------------------- Date: Sun, 24 Jun 2012 23:29:25 +0200 From: Adam Lackorzynski <adam(a)os.inf.tu-dresden.de> To: l4-hackers(a)os.inf.tu-dresden.de Subject: Re: Keeping track of the CPU time for a thread Message-ID: <20120624212925.GC1246(a)os.inf.tu-dresden.de> Content-Type: text/plain; charset=iso-8859-1 Hi, On Thu Jun 21, 2012 at 17:44:25 +0000, Mohammad A Haque wrote: > I want to measure how much CPU time a thread has consumed. When the > CPU time consumption exceeds a certain limit (specific to that > thread), I want to raise an interrupt. Please suggest me how can I do > it efficiently? The L4::Thread interface has the stats_time function to get the consumed time of a thread (FINE_GRAINED_CPUTIME in the kernel might be of interest here). Triggering an interrupt goes with its trigger function. Then it's just about plugging this together. Adam -- Adam adam(a)os.inf.tu-dresden.de Lackorzynski http://os.inf.tu-dresden.de/~adam/

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l4con
by Valery V. Sedletski 25 Jun '12

25 Jun '12

Hi again I forgot to ask, can l4con directly access video hardware? I knew that it supports some video acceleration features with, for example, Matrox cards (I have Matrox Millenium G400). So, can I use it with l4con video acceleration? If so, how to enable it? Is it detected automatically? Have you any plans for enancing fb_drv to support the video acceleration? There were some libraries used in Linux to support framebuffer acceleration. They could be ported to l4re... WBR, valery

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how to build L4android for ARM?
by Jay Yao 24 Jun '12

24 Jun '12

Hi , I'm a rookie. And I'm very interest in L4Android. I want to use L4android in arm platform, but I don't know how to build L4android for arm , is there any build tutorials?

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l4linux build failure, and a few questions
by Ryan Brown 24 Jun '12

24 Jun '12

I tried building l4linux for x86 and got this error: MODPOST vmlinux.o WARNING: modpost: Found 1 section mismatch(es). To see full details build your kernel with: 'make CONFIG_DEBUG_SECTION_MISMATCH=y' GEN .version CHK include/generated/compile.h UPD include/generated/compile.h CC init/version.o LD init/built-in.o LD .tmp_vmlinux1 drivers/built-in.o: In function `pnp_register_irq_resource': /home/ribrdb/fiasco/src/l4linux/drivers/pnp/resource.c:70: undefined reference to `pcibios_penalize_isa_irq' make[1]: *** [.tmp_vmlinux1] Error 1 make: *** [sub-make] Error 2 Has anyone seen this before? Also I had a few questions about configuring l4linux: I see that the paravirtualization options are not supported. Is there a specific reason for this? I'd like to be able to use virtio devices from l4linux when running in a VM. Neither x86_64 or highmem is supported. Is there any way to run an l4 linux with more than 1G of memory? Can 32 bit l4linux run on a 64 bit fiasco kernel? Does 32 bit fiasco support more than 1G of physical memory? What would be involved if I wanted to port l4linux to x86_64? Thanks, and sorry for so many questions. Ryan Brown

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Re: l4-hackers Digest, Vol 110, Issue 18
by Robert Campbell 24 Jun '12

24 Jun '12

> There's one thing to add, though: By running device drivers in dedicated > user-level processes, a crashing driver in the common case only takes > down its own process, but the rest of the system continues to run. > That's a major advantage, because you can have a monitoring process that > then restarts the driver [1] this way. > However, even a user space driver can still crash the system if it goes > rampant by misprogramming the DMA engine and you don't use an IOMMU. > Bjoern Are there plans to provide IOMMU support in Fiasco.OC?

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Keeping track of the CPU time for a thread
by Mohammad A Haque 24 Jun '12

24 Jun '12

Hi, I want to measure how much CPU time a thread has consumed. When the CPU time consumption exceeds a certain limit (specific to that thread), I want to raise an interrupt. Please suggest me how can I do it efficiently? Thanks.

2 1

Re: l4linux GPU direct access
by Abhishek Gupta 21 Jun '12

21 Jun '12

Hi Adam, I was just trying to change the config file of l4linux to enable support for MTRRs because my Xserver log file had a warning (WW) System lacks support for changing MTRRs I was wondering why it is not allowed to enable to support for MTRRs? Below is the complete X.org log file: X.Org X Server 1.7.7 Release Date: 2010-05-04 X Protocol Version 11, Revision 0 Build Operating System: Linux 2.6.32.29-dsa-ia32 i686 Debian Current Operating System: Linux moarhost 3.0.0-l4-svn23 #72 SMP Thu Mar 8 18:05:24 CET 2012 i686 Kernel command line: mem=400M root=/dev/hda Build Date: 19 February 2011 02:37:36PM xorg-server 2:1.7.7-13 (Cyril Brulebois <kibi(a)debian.org>) Current version of pixman: 0.16.4 Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (==) Log file: "/var/log/Xorg.0.log", Time: Thu Jan 1 00:00:27 1970 (==) Using system config directory "/usr/share/X11/xorg.conf.d" (==) No Layout section. Using the first Screen section. (==) No screen section available. Using defaults. (**) |-->Screen "Default Screen Section" (0) (**) | |-->Monitor "<default monitor>" (==) No monitor specified for screen "Default Screen Section". Using a default monitor configuration. (==) Automatically adding devices (==) Automatically enabling devices (WW) The directory "/usr/share/fonts/X11/misc" does not exist. Entry deleted from font path. (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist. Entry deleted from font path. (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist. Entry deleted from font path. (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist. Entry deleted from font path. (WW) The directory "/usr/share/fonts/X11/Type1" does not exist. Entry deleted from font path. (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist. Entry deleted from font path. (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist. Entry deleted from font path. (WW) The directory "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType" does not exist. Entry deleted from font path. (==) FontPath set to: built-ins (==) ModulePath set to "/usr/lib/xorg/modules" (II) The server relies on udev to provide the list of input devices. If no devices become available, reconfigure udev or disable AutoAddDevices. (II) Loader magic: 0x81ecca0 (II) Module ABI versions: X.Org ANSI C Emulation: 0.4 X.Org Video Driver: 6.0 X.Org XInput driver : 7.0 X.Org Server Extension : 2.0 (--) using VT number 7 (--) PCI:*(0:0:1:0) 1234:1111:1af4:1100 Technical Corp. rev 0, Mem @ 0xf0000000/16777216 (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory) (II) LoadModule: "extmod" (II) Loading /usr/lib/xorg/modules/extensions/libextmod.so (II) Module extmod: vendor="X.Org Foundation" compiled for 1.7.7, module version = 1.0.0 Module class: X.Org Server Extension ABI class: X.Org Server Extension, version 2.0 (II) Loading extension SELinux (II) Loading extension MIT-SCREEN-SAVER (II) Loading extension XFree86-VidModeExtension (II) Loading extension XFree86-DGA (II) Loading extension DPMS (II) Loading extension XVideo (II) Loading extension XVideo-MotionCompensation (II) Loading extension X-Resource (II) LoadModule: "dbe" (II) Loading /usr/lib/xorg/modules/extensions/libdbe.so (II) Module dbe: vendor="X.Org Foundation" compiled for 1.7.7, module version = 1.0.0 Module class: X.Org Server Extension ABI class: X.Org Server Extension, version 2.0 (II) Loading extension DOUBLE-BUFFER (II) LoadModule: "glx" (II) Loading /usr/lib/xorg/modules/extensions/libglx.so (II) Module glx: vendor="X.Org Foundation" compiled for 1.7.7, module version = 1.0.0 ABI class: X.Org Server Extension, version 2.0 (==) AIGLX enabled (II) Loading extension GLX (II) LoadModule: "record" (II) Loading /usr/lib/xorg/modules/extensions/librecord.so (II) Module record: vendor="X.Org Foundation" compiled for 1.7.7, module version = 1.13.0 Module class: X.Org Server Extension ABI class: X.Org Server Extension, version 2.0 (II) Loading extension RECORD (II) LoadModule: "dri" (II) Loading /usr/lib/xorg/modules/extensions/libdri.so (II) Module dri: vendor="X.Org Foundation" compiled for 1.7.7, module version = 1.0.0 ABI class: X.Org Server Extension, version 2.0 (II) Loading extension XFree86-DRI (II) LoadModule: "dri2" (II) Loading /usr/lib/xorg/modules/extensions/libdri2.so (II) Module dri2: vendor="X.Org Foundation" compiled for 1.7.7, module version = 1.1.0 ABI class: X.Org Server Extension, version 2.0 (II) Loading extension DRI2 (==) Matched vesa as autoconfigured driver 0 (==) Matched fbdev as autoconfigured driver 1 (==) Assigned the driver to the xf86ConfigLayout (II) LoadModule: "vesa" (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so (II) Module vesa: vendor="X.Org Foundation" compiled for 1.7.7, module version = 2.3.0 Module class: X.Org Video Driver ABI class: X.Org Video Driver, version 6.0 (II) LoadModule: "fbdev" (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so (II) Module fbdev: vendor="X.Org Foundation" compiled for 1.7.6.901, module version = 0.4.2 ABI class: X.Org Video Driver, version 6.0 (II) VESA: driver for VESA chipsets: vesa (II) FBDEV: driver for framebuffer: fbdev (II) Primary Device is: PCI 00@00:01:0 (WW) Falling back to old probe method for fbdev (II) Loading sub module "fbdevhw" (II) LoadModule: "fbdevhw" (II) Loading /usr/lib/xorg/modules/linux/libfbdevhw.so (II) Module fbdevhw: vendor="X.Org Foundation" compiled for 1.7.7, module version = 0.0.2 ABI class: X.Org Video Driver, version 6.0 (II) Loading sub module "vbe" (II) LoadModule: "vbe" (II) Loading /usr/lib/xorg/modules/libvbe.so (II) Module vbe: vendor="X.Org Foundation" compiled for 1.7.7, module version = 1.1.0 ABI class: X.Org Video Driver, version 6.0 (II) Loading sub module "int10" (II) LoadModule: "int10" (II) Loading /usr/lib/xorg/modules/libint10.so (II) Module int10: vendor="X.Org Foundation" compiled for 1.7.7, module version = 1.0.0 ABI class: X.Org Video Driver, version 6.0 (II) VESA(0): initializing int10 (WW) System lacks support for changing MTRRs (II) VESA(0): Primary V_BIOS segment is: 0xc000

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l4-hackers June 2012