users May 2011

users@lists.genode.org

15 participants
14 discussions

pager in Genode
by Chen Tian - SISA 13 May '11

13 May '11

Hello, I am trying to understand the memory management and pager implementation in Genode. I am stuck on Rm_client::pager function in rm_session_component.cc. Can somebody explain to me the main idea behind it, especially the reverse_lookup function? I must have missed some important data structures or designs of the memory management in RAM or Rm. Thanks. Regards, Chen

2 1

lwip examples
by Amadeo Cuadrado 13 May '11

13 May '11

Hello, I have not been able to run any of the lwip examples (I am using 32 bits): loopback hangs in socket() call, and http_srv hangs in the lwip_nic_init() call. I am using the Nic driver from dde_gpxe, since I got compilation errors when building the linux_drivers: .../genode/linux_drivers/src/linux26/arch/i386/lib/bitops.c: In function 'find_next_zero_bit': .../genode/linux_drivers/include/linux26-x86/asm/bitops.h:283: error: can't find a register in class 'BREG' while reloading 'asm' .../genode/linux_drivers/include/linux26-x86/asm/bitops.h:283: error: 'asm' operand has impossible constraints Any clue what I could be missing here to make these examples work? Let me know if you need more info about my environment. Thanks. Amadeo

5 9

Multiple TCP/IP apps
by Александр Домо 12 May '11

12 May '11

Hello, again! Could you please suggest the proper way to use the lwip library in multiple processes, especially, with libc_lwip_nic_dhcp? From my point of view, lwip alone should work ok in multiple processes, as long as a static IP-address is assigned. Those processes start communicating with the nic driver and just work along. Or they don't? As for the dhcp part, it gets more complicated. Do they all get the same IP address? As far as I know DHCP, they do. But I don't think this is really nice, when all the applications start querying for IP addresses. Maybe I should write a real, hard-core, independent TCP/IP module, which would offer IP services to everyone else, like it's done in QNX, for example? But that's not so easy, right? I'd prefer the easy way first ;) Thanks!!

2 1

malloc/free functions.
by Chen Tian - SISA 10 May '11

10 May '11

Hi, I found that malloc/free functions have been implemented in at least three different libraries: cxx, mini_c and libc. I assume cxx is used for genode base and core implementations, mini_c for demos and libc for porting. However, I am not able to use any of them in my own application. When using malloc defined in mini_c or libc, I got a compiler error " reference to 'size_t' is ambiguous". It looks like both stdlib.h in mini_c (or libc) directory and stdint.h in base directory have defined "size_t" type. And I cannot get rid of the use of stdint.h as it has been included in many genode base and core files. On the other hand, if I wanted to use the malloc in cxx by putting "cxx" into LIB in my application's target.mk, malloc cannot be recognized by the compiler. To solve this problem, I currently have to define my own malloc/free by copying the implementation from cxx and it works. However, I really wonder which malloc/free defined in genode should I use and how? By the way, the implementation of heap()->alloc() is thread-safe, right? Thanks. Chen

2 1

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users May 2011