genode/repos
Martin Stein 2633ff8661 alarm: fix information loss due to int-cast
When we have two time values of an unsigned integer type and we create
the difference and want to know wether it is positive or negative within
the same value we loose at least one half of the value range for casting
to signed integers. This was the case in the alarm scheduler when
checking wether an alarm already triggered. Even worse, we casted from
'unsigned long' to 'signed int' which caused further loss on at least
x86_64. Thus, big timeouts like ~0UL falsely triggered directly.

Now, we use an extra boolean value to remember in which period of the
time counter we are and to which period of the time counter the deadline
of an alarm belongs. This boolean switches its value each time the time
counter wraps. This way, we can avoid any casting by checking wether the
current time is of the same period as the deadline of the alarm that we
inspect. If so, the alarm is pending if "current time >= alarm
deadline", otherwise it is pending if "current time < alarm deadline".

Ref #2490
2017-10-05 17:39:56 +02:00
..
base support for Nim {.compile.} pragma for C sources 2017-10-05 17:39:56 +02:00
base-fiasco depot: update recipe hashes 2017-08-30 12:41:43 +02:00
base-foc depot: update recipe hashes 2017-08-30 12:41:43 +02:00
base-hw depot: update recipe hashes 2017-08-30 12:41:43 +02:00
base-linux Linux_dataspace: increase file name length 2017-09-07 11:47:15 +02:00
base-nova nova: report CPU idle times using genode cpu ids 2017-10-05 17:39:56 +02:00
base-okl4 okl4: copy elfweaver tool to build directory 2017-09-07 11:47:16 +02:00
base-pistachio pistachio: remove autom4te cache from contrib dir 2017-09-07 11:47:16 +02:00
base-sel4 sel4: adjust root cnode size for wand_quad board 2017-10-05 17:39:55 +02:00
dde_bsd Remove obsolete RAM/CAP services from run scripts 2017-05-31 13:16:22 +02:00
dde_ipxe Streamline exception types 2017-05-31 13:16:07 +02:00
dde_linux Fix typo in usb_hid test script 2017-10-05 17:39:56 +02:00
dde_rump depot: recipe for rump/file_system 2017-10-05 17:39:56 +02:00
demo depot: update recipe hashes 2017-08-30 12:41:43 +02:00
gems window layouter: fix initial window positioning 2017-10-05 17:39:54 +02:00
hello_tutorial Remove obsolete RAM/CAP services from run scripts 2017-05-31 13:16:22 +02:00
libports libc: sync bind sock control file before continuing with listen 2017-10-05 17:39:54 +02:00
os alarm: fix information loss due to int-cast 2017-10-05 17:39:56 +02:00
ports Noux: fix race condition on Vfs_io_channel destruction 2017-10-05 17:39:56 +02:00
README ports-foc: remove L4Linux 2017-01-31 12:01:12 +01:00

                      ===============================
                      Genode source-code repositories
                      ===============================


This directory contains the source-code repositories of the Genode OS
Framework. Each sub directory has the same principle layout as described in the
build-system manual:

:Build-system manual:

  [https://genode.org/documentation/developer-resources/build_system]

The build system uses a configurable selection of those reposities to obtain
the source codes for the build process. The repositories are not independent
but build upon of each other:

:'base':

  This directory contains the source-code repository of the fundamental
  frameworks and interfaces of Genode. Furthermore, it contains the generic
  parts of core.

:'base-<platform>':
  These directories contain platform-specific source-code repositories
  complementing the 'base' repository. The following platforms are supported:

  :'linux':
    Linux kernel (both x86_32 and x86_64)

  :'nova':
    NOVA hypervisor developed at University of Technology Dresden
    See [https://genode.org/documentation/platforms/nova]

  :'foc':
    Fiasco.OC is a modernized version of the Fiasco microkernel with a
    completely revised kernel interface fostering capability-based
    security. It is not compatible with L4/Fiasco.
    See [https://genode.org/documentation/platforms/foc]

  :'hw':
    The hw platform allows the execution of Genode on bare ARM and x86 hardware
    without the need for a separate kernel. The kernel functionality is
    included in core except in the special case of the Muen separation
    kernel.
    See [https://genode.org/documentation/platforms/hw] and
    [https://genode.org/documentation/platforms/muen]

  :'okl4':
    OKL4 kernel (x86_32 and ARM) developed at Open-Kernel-Labs.
    See [https://genode.org/documentation/platforms/okl4]

  :'pistachio':
    L4ka::Pistachio kernel developed at University of Karlsruhe.
    See [https://genode.org/documentation/platforms/pistachio]

  :'fiasco':
    L4/Fiasco kernel developed at University of Technology Dresden.
    See [https://genode.org/documentation/platforms/fiasco]

  :'sel4':
    seL4 microkernel developed at NICTA/General Dynamics
    See[https://sel4.systems/]

:'os':

  This directory contains the non-base OS components such as the init process,
  device drivers, and basic system services.

:'demo':

  This directory contains the source-code repository of various services and
  applications that we use for demonstration purposes. For example, a graphical
  application launcher called Launchpad and the Scout tutorial browser.

:'hello_tutorial':

  Tutorial for creating a simple client-server scenario with Genode. This
  repository includes documentation and the complete source code.

:'libports':

  This source-code repository contains ports of popular open-source libraries
  to Genode, most importantly the C library. The repository contains no
  upstream source code but means to download the code and adapt it to Genode.
  For instructions about how to use this mechanism, please consult the README
  file at the top level of the repository. Among the 3rd-party libraries
  are Qt5, libSDL, freetype, Python, ncurses, Mesa, and libav.

:'dde_linux':

  This source-code repository contains the device driver environment for
  executing Linux device drivers natively on Genode. Currently, this
  repository hosts the USB stack.

:'dde_ipxe':

  This source-code repository contains the device-driver environment for
  executing drivers of the iPXE project.

:'dde_bsd':

  This source-code repository contains the device-driver environment for
  drivers of the OpenBSD operating system.

:'dde_rump':

  This source-code repository contains the port of rump kernels, which are
  used to execute subsystems of the NetBSD kernel as user level processes.
  The repository contains a server that uses a rump kernel to provide
  various NetBSD file systems to Genode.

:'ports':

  This source-code repository hosts ports of 3rd-party applications to
  Genode. The repository does not contain upstream source code but provides
  a mechanism for downloading the official source distributions and adapt
  them to the Genode environment. The used mechanism is roughly the same
  as used for the 'libports' repository. Please consult 'libports/README'
  for further information.

:'gems':

  This source-code repository contains Genode applications that use
  both native Genode interfaces as well as features of other high-level
  repositories, in particular shared libraries provided by 'libports'.