l4-hackers June 2017

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

12 participants
24 discussions

Graphical desktop, l4con, mag
by teclis High Elf 02 Jun '17

02 Jun '17

Guten Tag, I've got the Hello app runing with fiasco and l4re in qemu, how do I get the graphical UI and console running that I see on the screen shots page? Do I need to use l4con and mag? I don't see an entry with l4con in modules.list. danke * <http://german.about.com/library/media/Audio/gutentag.wav>*

6 15

L4Linux CONFIG_MTRR must not be enabled
by 翟翔 02 Jun '17

02 Jun '17

Hi L4 hackers, When I am building L4Linux https://l4linux.org/build.shtml make O=build menuconfig changed the L4 tree build directory, then Exit for saving to .config make O=build it thrown ERROR: CONFIG_XXX must not be enabled, then I edited build/.config to comment the CONFIG_XXX is not set, then make O=build again, but it always thrown such error: make[1]: Entering directory '/home/zhaixiang/project/l4linux/build' =============================================== For quick build instructions, please visit: http://wiki.tudos.org/Quickstart http://l4linux.org/build.shtml =============================================== ERROR: CONFIG_MTRR must not be enabled. ERROR: CONFIG_DMI must not be enabled. ERROR: CONFIG_X86_SMAP must not be enabled. arch/l4/Makefile:578: recipe for target 'check_linux_config' failed make[1]: *** [check_linux_config] Error 1 make[1]: Leaving directory '/home/zhaixiang/project/l4linux/build' Makefile:150: recipe for target 'sub-make' failed make: *** [sub-make] Error 2 even I commented CONFIG_MTRR, CONFIG_DMI and CONFIG_X86_SMAP is not set, but rebuilt it again, the CONFIG_MTRR=y, are they requires by other modules? infinite dependence issue? so I simply changed the arch/l4/Makefile Index: arch/l4/Makefile =================================================================== --- arch/l4/Makefile (revision 54) +++ arch/l4/Makefile (working copy) @@ -557,9 +557,9 @@ DIS_OPTS-arm-32 := PERF_EVENTS ARM_PATCH_PHYS_VIRT HIGHMEM \ DEBUG_RODATA DEBUG_ALIGN_RODATA DIS_OPTS := HIGHMEM4G HIGHMEM64G PCI_GOANY PCI_GOBIOS \ - X86_MCE X86_MCE MTRR PARAVIRT KEXEC MCA SOFTWARE_SUSPEND APM \ - CPU_FREQ VM86 X86_DS X86_PTRACE_BTS HT_IRQ DMI \ - TRANSPARENT_HUGEPAGE COMPACTION X86_PAE ACPI X86_SMAP \ + X86_MCE X86_MCE PARAVIRT KEXEC MCA SOFTWARE_SUSPEND APM \ + CPU_FREQ VM86 X86_DS X86_PTRACE_BTS HT_IRQ \ + TRANSPARENT_HUGEPAGE COMPACTION X86_PAE ACPI \ M486 M586 M586TSC M586MMX PNP \ X86_16BIT MICROCODE \ $(DIS_OPTS-$(BASEARCH)-$(BITS)) it is monkey patch, please give me some advice, thanks a lot! -- Regards, Leslie Zhai - a LLVM hacker https://reviews.llvm.org/p/xiangzhai/

3 2

Benchmarks in l4
by Maxim Baryshnikov 01 Jun '17

01 Jun '17

Hello everybody, Does the L4re contain some kind of simple performance benchmarks which are already prepared to use? I've tried to launch some demos from the ferret package but not succeed... Thank you in advance for any suggestions. Sincerely, Maxim Baryshnikov.

4 11

Re: libfs/ FUSE on L4Re
by Leslie Zhai 01 Jun '17

01 Jun '17

diff --git a/libfs/lib/libc_backend/l4fs.cc b/libfs/lib/libc_backend/l4fs.cc index 7a229ff..31ad120 100644 --- a/libfs/lib/libc_backend/l4fs.cc +++ b/libfs/lib/libc_backend/l4fs.cc @@ -219,10 +219,10 @@ int L4fs_dir::get_entry(const char *name, int flags, mode_t mode, //printf("mode=%x,flags=%x\n", mode, flags); if (S_ISDIR(mode)) { //printf("open '%s' as directory\n", name); - *file = new L4fs_dir(_svr, fh); + *file = cxx::ref_ptr(new L4fs_dir(_svr, fh)); } else { //printf("open '%s' as file\n", name); - *file = new L4fs_file(_svr, fh); + *file = cxx::ref_ptr(new L4fs_file(_svr, fh)); } return (*file) ? 0 : -ENOMEM; @@ -325,7 +325,7 @@ int L4fs_file_system::mount(char const *source, unsigned long mountflags, if (fh < 0) return fh; - *dir = new L4fs_dir(svr, fh); + *dir = cxx::ref_ptr(new L4fs_dir(svr, fh)); if (!dir) return -ENOMEM; 在 2017年06月01日 15:36, Xiang Zhai 写道: > Hi Florian, > > > /home/zhaixiang/project/l4re/l4/pkg/libfs/lib/libc_backend/l4fs.cc: In > member function ‘virtual int L4fs::L4fs_dir::get_entry(const char*, > int, mode_t, cxx::Ref_ptr<L4Re::Vfs::File>*)’: > /home/zhaixiang/project/l4re/l4/pkg/libfs/lib/libc_backend/l4fs.cc:222:38: > error: no match for ‘operator=’ (operand types are > ‘cxx::Ref_ptr<L4Re::Vfs::File>’ and ‘L4fs::L4fs_dir*’) > *file = new L4fs_dir(_svr, fh); > ^ > In file included from > /home/zhaixiang/project/l4re/l4/build/include/l4/l4re_vfs/vfs.h:41:0, > from > /home/zhaixiang/project/l4re/l4/build/include/l4/l4re_vfs/backend:22, > from > /home/zhaixiang/project/l4re/l4/pkg/libfs/lib/libc_backend/l4fs.cc:15: > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:186:8: > note: candidate: template<class OT> void cxx::Ref_ptr<T, > CNT>::operator=(const cxx::Ref_ptr<OT>&) [with OT = OT; T = > L4Re::Vfs::File; CNT = cxx::Default_ref_counter] > void operator = (Ref_ptr<OT> const &o) throw() > ^~~~~~~~ > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:186:8: > note: template argument deduction/substitution failed: > /home/zhaixiang/project/l4re/l4/pkg/libfs/lib/libc_backend/l4fs.cc:222:38: > note: mismatched types ‘const cxx::Ref_ptr<T>’ and ‘L4fs::L4fs_dir*’ > *file = new L4fs_dir(_svr, fh); > ^ > In file included from > /home/zhaixiang/project/l4re/l4/build/include/l4/l4re_vfs/vfs.h:41:0, > from > /home/zhaixiang/project/l4re/l4/build/include/l4/l4re_vfs/backend:22, > from > /home/zhaixiang/project/l4re/l4/pkg/libfs/lib/libc_backend/l4fs.cc:15: > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:193:8: > note: candidate: void cxx::Ref_ptr<T, CNT>::operator=(const > cxx::Ref_ptr<T>&) [with T = L4Re::Vfs::File; CNT = > cxx::Default_ref_counter] > void operator = (Ref_ptr<T> const &o) throw() > ^~~~~~~~ > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:193:8: > note: no known conversion for argument 1 from ‘L4fs::L4fs_dir*’ to > ‘const cxx::Ref_ptr<L4Re::Vfs::File>&’ > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:203:8: > note: candidate: void cxx::Ref_ptr<T, CNT>::operator=(cxx::Ref_ptr<T, > CNT>::Null_type) [with T = L4Re::Vfs::File; CNT = > cxx::Default_ref_counter; cxx::Ref_ptr<T, CNT>::Null_type = > std::nullptr_t] > void operator = (Null_type) throw() > ^~~~~~~~ > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:203:8: > note: no known conversion for argument 1 from ‘L4fs::L4fs_dir*’ to > ‘cxx::Ref_ptr<L4Re::Vfs::File>::Null_type {aka std::nullptr_t}’ > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:218:8: > note: candidate: template<class OT> void cxx::Ref_ptr<T, > CNT>::operator=(cxx::Ref_ptr<OT>&&) [with OT = OT; T = > L4Re::Vfs::File; CNT = cxx::Default_ref_counter] > void operator = (Ref_ptr<OT> &&o) throw() > ^~~~~~~~ > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:218:8: > note: template argument deduction/substitution failed: > /home/zhaixiang/project/l4re/l4/pkg/libfs/lib/libc_backend/l4fs.cc:222:38: > note: mismatched types ‘cxx::Ref_ptr<T>’ and ‘L4fs::L4fs_dir*’ > *file = new L4fs_dir(_svr, fh); > ^ > In file included from > /home/zhaixiang/project/l4re/l4/build/include/l4/l4re_vfs/vfs.h:41:0, > from > /home/zhaixiang/project/l4re/l4/build/include/l4/l4re_vfs/backend:22, > from > /home/zhaixiang/project/l4re/l4/pkg/libfs/lib/libc_backend/l4fs.cc:15: > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:224:8: > note: candidate: void cxx::Ref_ptr<T, > CNT>::operator=(cxx::Ref_ptr<T>&&) [with T = L4Re::Vfs::File; CNT = > cxx::Default_ref_counter] > void operator = (Ref_ptr<T> &&o) throw() > ^~~~~~~~ > /home/zhaixiang/project/l4re/l4/build/include/l4/cxx/ref_ptr:224:8: > note: no known conversion for argument 1 from ‘L4fs::L4fs_dir*’ to > ‘cxx::Ref_ptr<L4Re::Vfs::File>&&’ > > > So I simply added cxx::ref_ptr() for reference counting pointer with > automatic cleanup: > > > diff --git a/libfs/lib/libc_backend/l4fs.cc > b/libfs/lib/libc_backend/l4fs.cc > index 7a229ff..31ad120 100644 > --- a/libfs/lib/libc_backend/l4fs.cc > +++ b/libfs/lib/libc_backend/l4fs.cc > @@ -219,10 +219,10 @@ int L4fs_dir::get_entry(const char *name, int > flags, mode_t mode, > //printf("mode=%x,flags=%x\n", mode, flags); > if (S_ISDIR(mode)) { > //printf("open '%s' as directory\n", name); > - *file = new L4fs_dir(_svr, fh); > + *file = cxx::ref_ptr(new L4fs_dir(_svr, fh)); > } else { > //printf("open '%s' as file\n", name); > - *file = new L4fs_file(_svr, fh); > + *file = cxx::ref_ptr(new L4fs_file(_svr, fh)); > } > > return (*file) ? 0 : -ENOMEM; > @@ -325,7 +325,7 @@ int L4fs_file_system::mount(char const *source, > unsigned long mountflags, > if (fh < 0) > return fh; > > - *dir = new L4fs_dir(svr, fh); > + *dir = cxx::ref_ptr(new L4fs_dir(svr, fh)); > if (!dir) > return -ENOMEM; > > > please review my patch, thanks a lot! > -- Regards, Leslie Zhai - a LLVM hacker https://reviews.llvm.org/p/xiangzhai/

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l4-hackers June 2017