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2827 discussions

Fwd: Microkernels / Component-based OSes devroom - Call for Participation
by Norman Feske 18 Oct '16

18 Oct '16

Hello L4 hackers, I'd like to invite you to the microkernel developer room at the upcoming FOSDEM in Brussels. Please find the call for participation below. Cheers Norman FOSDEM 2017 - Microkernels / Component-based OSes devroom CALL FOR PARTICIPATION The developers of several free and open-source microkernel-based operating systems will meet at FOSDEM 2017 [1] in Brussels, Belgium and will share a developer room on Saturday of February 04, 2017 [2]. The devroom is currently looking for content in the form of talks and activities related to the area of microkernel-based operating systems. Possible topics include, but are not limited to: * Introduction of a specific OS or framework * Design of subsystems and the general architecture of an OS * Enabling support for hardware (architectures, device drivers) * Used languages and tools * Maintainance and testing * Security and robustness * Trends and challenges * Use cases, experiences, lessons learned and demos Please use the Pentabarf [3] system to submit your proposals and file it under the track “Microkernels and Component-based OS”. You do not need to create a new account if you already have one. When in doubt, please use the devroom mailing list [4]. If you do not want to give a talk yourself, you may still send suggestions for what else you would like to see, or do in the devroom. Please send your suggestions to the mailing list. The deadline for your proposal is on December the 4th. Make sure to include the following in your proposal: * Title of your talk (will be printed in the FOSDEM booklet) * Your full name (will be printed in the FOSDEM booklet) * A short abstract (one or two paragraphs) * Duration of your talk (please, at least 25 and no longer than 45 min) The official devroom schedule (along with the accepted talks) will be announced on December the 11th on the devroom's mailing list and the speakers will be notified via e-mail. The schedule will also be published on the FOSDEM website. About FOSDEM FOSDEM is a two-day event organised by volunteers to promote the widespread use of free and open source software. Taking place in the beautiful city of Brussels (Belgium), FOSDEM is widely recognised as the best such conference in Europe. FOSDEM covers a wide spectrum of free and open source software projects, and offers a platform for people to collaborate. To this end, FOSDEM has set up developer rooms (devrooms) with network/internet connectivity and projectors where teams can meet and showcase their projects. Devrooms are a place for teams to discuss, hack and publicly present latest directions, lightning talks, news and discussions. Besides developer rooms, FOSDEM also offers main tracks, lightning talks, certification exams and project stands. Every year, FOSDEM hosts more than 5000 developers at the ULB Solbosch campus. Participation and attendance is totally free, though the organisers gratefully accept donations and sponsorship. No registration necessary. About the devroom Since the first Microkernel devroom in 2012 this devroom has been part of each following FOSDEM. By now it has become a somewhat institutionalized tradition for the micro kernel community to meet there; to this date over a dozen projects have participated in one way or another. Each of the projects face similar challenges but come up with partially differend solutions. Therefore, the goal of the Microkernel devroom is to bring the various projects together, let them exchange ideas, cross-pollinate and socialize. Social events It also has become a habit that the microkernel projects dine together somewhere in downtown Brussels after the devroom closes. The year 2017 will not be any different, so there is going to be a microkernel family dinner on Saturday night. The exact location and time will be specified later. Consult the FOSDEM web and other projects for additional social events such as the famous FOSDEM-organized Friday Beer Event and the FOSDEM-arranged free sightseeing tours for spouses. Important dates recap * 04.12.2016: Deadline for submissions * 11.12.2016: Schedule published and speakers notified of acceptance * 04.02.2017: The devroom takes places Links [1] http://fosdem.org/ [2] https://fosdem.org/2017/practical/transportation/ [3] https://fosdem.org/submit [4] https://lists.fosdem.org/listinfo/microkernel-devroom See you all at FOSDEM!

1 0

fiasco.oc i.MX7d port
by Marc CHALAND 14 Oct '16

14 Oct '16

Hi, I'm trying to port fiasco.oc to i.MX7d. It works, but I cannot start second core. I set trampoline addr into corresponding GPR and enables CORE1. But nothing happens. I saw that trampoline assembler code enables SCU through external registers. But with cortex a7, SCU hasn't got external registers. So, I ifdefed it but CPU0 still doesn't startup. Can somebody help me ? Regards Marc

2 7

L4Linux stop at "Calibrating delay loop ..."
by li94575 09 Oct '16

09 Oct '16

Hi，l4hackers I compiled the l4re-snapshot-2014092821 with the default modules.list, and everything seems goes well. However, L4Linux would stop at "Calibrating delay loop ...", because the value of jiffies did not change. Timer thread has not generate soft interrupt? If I entered jdb via ESC at this time, and quit via "g", then l4linux can run again. It makes me confused so much. Any help or suggestion will be very welcome. The log is showing below: L4 Bootstrapper Build: #12 2016年 09月 19日星期一 18:58:15 CST, 4.8.3 20140320 (prerelease) Scanning up to 2048 MB RAM, starting at offset 32MB Memory size is 2048MB (00000000 - 7fffffff) RAM: 0000000000000000 - 000000007fffffff: 2097152kB Total RAM: 2048MB Scanning fiasco Scanning sigma0 Scanning moe Moving up to 10 modules behind 1100000 moving module 02 { 1968000-19a163f } -> { 1a58000-1a9163f } [235072] moving module 01 { 195e000-196738b } -> { 1a4e000-1a5738b } [37772] moving module 00 { 18f8000-195d9db } -> { 19e8000-1a4d9db } [416220] moving module 09 { 15f8000-18f7fff } -> { 16e8000-19e7fff } [3145728] moving module 08 { 11d6000-15f7497 } -> { 12c6000-16e7497 } [4330648] moving module 07 { 11d5000-11d50bc } -> { 12c5000-12c50bc } [189] moving module 06 { 107e000-11d446f } -> { 116e000-12c446f } [1401968] moving module 05 { 107d000-107d19b } -> { 116d000-116d19b } [412] moving module 04 { 102a000-107cc1f } -> { 111a000-116cc1f } [338976] moving module 03 { 1010000-1029473 } -> { 1100000-1119473 } [103540] Loading fiasco Loading sigma0 Loading moe find kernel info page... found kernel info page at 0x2000 Regions of list 'regions' [ 1000, 1aff] { b00} Kern fiasco [ 2000, 72fff] { 71000} Kern fiasco [ 73000, 7315f] { 160} Root mbi_rt [ 90000, 96edf] { 6ee0} Sigma0 sigma0 [ 98000, 9e177] { 6178} Sigma0 sigma0 [ 140000, 171d8f] { 31d90} Root moe [ 178000, 1934ab] { 1b4ac} Root moe [ 1000000, 100f58b] { f58c} Boot bootstrap [ 1100000, 19e7fff] { 8e8000} Root Module API Version: (87) experimental Sigma0 config ip:00090100 sp:00000000 Roottask config ip:00140260 sp:00000000 Starting kernel fiasco at 000012e0 Hello from Startup::stage2 Per_cpu_data_alloc: (orig: 0xf0061720-0xf00620e8) Number of IRQs available at this GIC: 128 FPU0: Arch: Unkn(2), Part: VFPv3(30), r: 5, v: 7, i: 41, t: hard, p: dbl/sngl ARM generic timer: freq=1000000 interval=1000 cnt=-262144 SERIAL ESC: allocated IRQ 89 for serial uart Not using serial hack in slow timer handler. Welcome to Fiasco.OC (arm)! L4/Fiasco.OC arm microkernel (C) 1998-2013 TU Dresden Rev: 8fd26ca-dirty compiled with gcc 4.8.3 for [] Build: #3 Mon Sep 19 18:55:38 CST 2016 Per_cpu_data_alloc: (orig: 0xf0061720-0xf00620e8) Allocate 2504 bytes (2KB) for CPU[4] local storage (offset=118a8e0, 0xf11ec000-0xf11ec9c8) cpu1: powered-up Per_cpu_data_alloc: (orig: 0xf0061720-0xf00620e8) cpu2: powered-up Allocate 2504 bytes (2KB) for CPU[1] local storage (offset=118c8e0, 0xf11ee000-0xf11ee9c8) cpu3: powered-up FPU1: Arch: Unkn(2), Part: VFPv3(30), r: 5, v: 7, i: 41, t: hard, p: dbl/sngl Calibrating timer loop... Per_cpu_data_alloc: (orig: 0xf0061720-0xf00620e8) done. Allocate 2504 bytes (2KB) for CPU[2] local storage (offset=118f8e0, 0xf11f1000-0xf11f19c8) Cache config: ON MDB: use page size: 30 FPU2: Arch: Unkn(2), Part: VFPv3(30), r: 5, v: 7, i: 41, t: hard, p: dbl/sngl ID_PFR[01]: 00001131 00011011Per_cpu_data_alloc: (orig: 0xf0061720-0xf00620e8) MDB: use page size: 21 Allocate 2504 bytes (2KB) for CPU[3] local storage (offset=11968e0, 0xf11f8000-0xf11f89c8) ID_[DA]FR0: 02010555 00000000 Cache config: ON MDB: use page size: 12 FPU3: Arch: Unkn(2), Part: VFPv3(30), r: 5, v: 7, i: 41, t: hard, p: dbl/sngl ID_PFR[01]: 00001131 00011011SID_MMFR[04]: 10101105 40000000 01240000 02102211 Cache config: ON ID_[DA]FR0: 02010555 00000000 ID_PFR[01]: 00001131 00011011ID_MMFR[04]: 10101105 40000000 01240000 02102211 ICPU[2]: goes to idle loop ID_[DA]FR0: 02010555 00000000 GID_MMFR[04]: 10101105 40000000 01240000 02102211 CPU[1]: goes to idle loop CPU[3]: goes to idle loop MA0: Hello! KIP @ 2000 allocated 4KB for maintenance structures SIGMA0: Dump of all resource maps RAM:------------------------ [0:0;fff] [4:73000;73fff] [0:74000;8ffff] [0:97000;97fff] [0:9f000;13ffff] [4:140000;171fff] [0:172000;177fff] [4:178000;193fff] [0:194000;10fffff] [4:1100000;19e7fff] [0:19e8000;3effffff] [0:40000000;7fffffff] IOMEM:---------------------- [0:80000000;ffffffff] MOE: Hello world MOE: found 2070816 KByte free memory MOE: found RAM from 73000 to 80000000 MOE: allocated 2047 KByte for the page array @0x194000 MOE: virtual user address space [0-bfffffff] MOE: rom name space cap -> [C:501000] BOOTFS: [1100000-1119474] [C:503000] l4re BOOTFS: [111a000-116cc20] [C:504000] ned BOOTFS: [116d000-116d19c] [C:505000] l4lx.cfg BOOTFS: [116e000-12c4470] [C:506000] io BOOTFS: [12c5000-12c50bd] [C:507000] arm-rv.io BOOTFS: [12c6000-16e7498] [C:508000] vmlinuz.arm BOOTFS: [16e8000-19e8000] [C:509000] ramdisk-arm.rd MOE: cmdline: moe rom/l4lx.cfg MOE: Starting: rom/ned rom/l4lx.cfg MOE: loading 'rom/ned' Ned says: Hi World! Ned: loading file: 'rom/l4lx.cfg' l4linux | libio: Warning: Query of 'vbus' failed! l4linux | PH 0 (t: 1) offs=00008000 vaddr=02000000 vend=024c8dd4 l4linux | phys= 02000000 ephys=024c8dd4 l4linux | f_sz= 00404594 memsz=004c8dd4 flgs=rwx l4linux | PH 1 (t: 4) offs=003b44e0 vaddr=023ac4e0 vend=023ac504 l4linux | phys= 023ac4e0 ephys=023ac504 l4linux | f_sz= 00000024 memsz=00000024 flgs=r-x l4linux | PH 2 (t: 1685382481) offs=00000000 vaddr=00000000 vend=00000000 l4linux | phys= 00000000 ephys=00000000 l4linux | f_sz= 00000000 memsz=00000000 flgs=rwx l4linux | Starting binary at 0x2000360, argc=8 argv=0xafff4f84 *argv=0xb1007ff0 argv0=rom/vmlinuz.arm l4linux | External resolver is at 0xa8000788 l4linux | ======> L4Linux starting... <======== l4linux | Linux version 3.16.0-l4 (li94575@li94575-Lenovo) (gcc version 4.8.3 20140320 (prerelease) (Sourcery CodeBench Lite 2014.05-29) ) #3 SMP Mon Sep 19 18:57:16 CST 2016 l4linux | Binary name: rom/vmlinuz.arm l4linux | This is an AEABI build. l4linux | Linux kernel command line (7 args): mem=64M l4x_cpus=4 l4x_cpus_map=0,1,2,3 console=ttyLv0 l4x_rd=rom/ramdisk-arm.rd root=1:0 ramdisk_size=4000 l4linux | CPU mapping (l:p)[4]: 0:0, 1:1, 2:2, 3:3 l4linux | Image: 020000a0 - 02600000 [6143 KiB]. l4linux | Areas: Text: 020000a0 - 023d6000 [3927kB] (a bit longer) l4linux | Data: 023d6000 - 023ff520 [165kB] l4linux | Initdata: 023ad000 - 023d57c0 [161kB] l4linux | BSS: 02404594 - 024c8dd4 [786kB] l4linux | Device scan: l4linux | Device scan done. l4linux | l4lx_thread_create: Created thread 413 (cpu0) (u:b3000e00, v:b3000c00, sp:023d7fa4) l4linux | main thread will be 413 l4linux | l4x_register_pointer_section: addr = 02000000 size = 5017600 l4linux | section-with-init: Virt: 0x2000000 to 0x24c8dd3 [4899 KiB] l4linux | section-with-init: Phys: 0x0042b000 to 0x008f3dd3, [4899 KiB] l4linux | Main thread running, waiting... l4linux | L4x: Memory size: 64MB l4linux | L4x: Setting superpages for main memory l4linux | L4x: Adjusted memory start: 02000000 l4linux | Main memory: Virt: 0x2600000 to 0x65fffff [65536 KiB] l4linux | Main memory: Phys: 0x01a00000 to 0x059fffff, [65536 KiB] l4linux | l4x: vmalloc area: 06600000 - 0e600000 l4linux | l4x_register_pointer_section: addr = 02000000 size = 5017600 l4linux | text: Virt: 0x2000000 to 0x24c8dd3 [4899 KiB] l4linux | text: Phys: 0x0042b000 to 0x008f3dd3, [4899 KiB] l4linux | Loading: rom/ramdisk-arm.rd l4linux | INITRD: Size of RAMdisk is 3072KiB l4linux | RAMdisk from 00002000 to 00302000 [3072KiB] l4linux | l4lx_thread_create: Created thread 419 (timer0) (u:b3000a00, v:00000000, sp:0245dfa0) Booting Linux on physical CPU 0x0 Linux version 3.16.0-l4 (li94575@li94575-Lenovo) (gcc version 4.8.3 20140320 (prerelease) (Sourcery CodeBench Lite 2014.05-29) ) #3 SMP Mon Sep 19 18:57:16 CST 2016 CPU: Fiasco [410fc075] revision 5 (ARMv7), cr=00000000 CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing instruction cache Machine: L4 Ignoring unrecognised tag 0x00000000 Forcing write-allocate cache policy for SMP Forcing shared mappings for SMP Memory policy: Data cache writealloc INITRD: 00002000 - 00302000 PERCPU: Embedded 5 pages/cpu @06509000 s6080 r0 d14400 u32768 Built 1 zonelists in Zone order, mobility grouping on. Total pages: 17716 Kernel command line: mem=64M l4x_cpus=4 l4x_cpus_map=0,1,2,3 console=ttyLv0 l4x_rd=rom/ramdisk-arm.rd root=1:0 ramdisk_size=4000 PID hash table entries: 512 (order: -1, 2048 bytes) Dentry cache hash table entries: 16384 (order: 4, 65536 bytes) Inode-cache hash table entries: 8192 (order: 3, 32768 bytes) Memory: 64728K/71680K available (3157K kernel code, 165K rwdata, 604K rodata, 161K init, 786K bss, 6952K reserved) Virtual kernel memory layout: vector : 0xbffff000 - 0xc0000000 ( 4 kB) fixmap : 0xffc00000 - 0xffe00000 (2048 kB) vmalloc : 0x06600000 - 0x0e600000 ( 128 MB) lowmem : 0x00000000 - 0x06600000 ( 102 MB) .text : Virtual kernel memory layout: vector : 0xbffff000 - 0xc0000000 ( 4 kB) fixmap : 0xffc00000 - 0xffe00000 (2048 kB) vmalloc : 0x06600000 - 0x0e600000 ( 128 MB) loHierarchical RCU implementation. NR_IRQS:220 l4timer: Using IRQ210 sched_clock: 64 bits at 1000kHz, resolution 1000ns, wraps every 2147483648000ns Console: colour dummy device 80x30 console [ttyLv0] enabled Calibrating delay loop...

3 7

Is L4Linux can use its existed Linux driver to access hardware device?
by Zhe Zhao 14 Sep '16

14 Sep '16

Hi, After read the basic ideas of L4Linux I have some questions related to it. Is L4Linux run as a paravirtualization VM on L4Re? Then the traditional Linux Process just still compiled against Linux system and put them together with L4Linux disk image? so it means L4Re works like qemu and Linuxl? or L4Re works as a micro kernel operating system, and L4Linux run as a process on it, all devices handled to L4Linux to reuse the drivers of L4Linux? and the previous Linux process compiled with Linux, but run direct on L4Re as L4 processes which communicate with L4Linux through IPC? it is quite confused after read a little of the codes, in L4Linux, seems there is some injection of L4 task stuffs inside thread_struct of Linux, but also have some vCPU related stuffs, can you help me about what is the real behavior of L4Linux? I'm sorry to ask this basic questions, but after some digging I feel quite confused about how it works. Thanks Br Alex

2 7

Partitioned Scheduling
by Edinger, Stefan 09 Sep '16

09 Sep '16

Hi, is it possible to have partitioned scheduling in the way that one can use different schedulers for different cpu-cores? And if yes, can I do the mapping from scheduler to core on runtime or is it done at compile time? Thanks, Stefan

4 7

l4_thread_ex_regs and suspending thread
by Valery V. Sedletski 16 Aug '16

16 Aug '16

hi, l4-hackers. I am now using l4v2 API with L4/Fiasco. I know that on L4 v.2 API, the thread is created if set eip/esp/pager/preempter to real values. And it seems that likewise, thread can be suspended if setting these values to invalid ones. But as I tried it, setting the running thread eip/esp to -1 causes double page fault in that thread. Setting them to 0 does not change these values (though, in headers' comments, documented value is ~0). Setting pager/preempter to L4_INVALID_ID also causes double page fault. This is strange, as docs/comments state the converse. So, is it possible anyhow to suspend/resume the running thread from another thread? I know, that the thread can be suspended if entering unconditional l4_ipc_wait(), but this is from the inside that thread. How could it be done from an outside thread? Thanks in advance, valery

4 12

Genode + Fiasco.OC: How to access multiple run queues?
by Guru Siddesh 08 Aug '16

08 Aug '16

Hello L4-hackers , I'm writing a Genode component which should access and modify the Run queues of the scheduler. Based on what I have read and looked there will be one scheduler for each processor. How to access the different scheduler objects and Run queues from Genode side? I have looked through the code and able to print the run queue from the ready_queue_fp.cpp. But how do you access 2 run queues when number of processors is more than one? And what is the easy way to manipulate these from Genode component.? PS: I have read Genode book and have a basic idea of Genode architecture. Best regards, Guru

2 1

memory map/unmap performance
by Yuxin Ren 02 Aug '16

02 Aug '16

Hi all, I am curious memory mapping/unmapping performance. Are there any applications that stress the memory mapping and unmapping utility? Thanks a lot! Yuxin

2 1

USDHC driver for i.MX6
by AIT HMID Moha 29 Jul '16

29 Jul '16

Hi L4 hackers, Is a L4Linux/Fiasco driver for Freescale i.MX6 processor USDHC module available ? If not any input/clue to port an existing implementation ? Best regards, MAH

2 1

l4linux panic on iMX6SX
by AIT HMID Moha 29 Jul '16

29 Jul '16

Hi L4 hackers, I am using l4re-snapshot-2014092821 and running L4Linux/L4 on Freescale iMX6SX SABRE SDB card. Here attached my Fiasco, L4, L4Linux and moe starting configurations and the resulted displayed traces. I got a l4linux 'kernel panic'. Any idea about the issue ? Best regards, MAH

2 1

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