genode/repos
Reto Buerki c82f5e9269 hw_x86_64: Do not mask edge-triggered interrupts
Do not mask edge-triggered interrupts to avoid losing them while masked,
see Intel 82093AA I/O Advanced Programmable Interrupt Controller
(IOAPIC) specification, section 3.4.2, "Interrupt Mask":

"When this bit is 1, the interrupt signal is masked. Edge-sensitive
interrupts signaled on a masked interrupt pin are ignored (i.e., not
delivered or held pending)"

Or to quote Linus Torvalds on the subject:

"Now, edge-triggered interrupts are a _lot_ harder to mask, because the
Intel APIC is an unbelievable piece of sh*t, and has the edge-detect
logic _before_ the mask logic, so if a edge happens _while_ the device
is masked, you'll never ever see the edge ever again (unmasking will not
cause a new edge, so you simply lost the interrupt)."

So when you "mask" an edge-triggered IRQ, you can't really mask it at
all, because if you did that, you'd lose it forever if the IRQ comes in
while you masked it. Instead, we're supposed to leave it active, and set
a flag, and IF the IRQ comes in, we just remember it, and mask it at
that point instead, and then on unmasking, we have to replay it by
sending a self-IPI." [1]

[1] - http://yarchive.net/comp/linux/edge_triggered_interrupts.html

Ref #1448
2015-03-27 11:53:34 +01:00
..
base base: Raise RAM quota of signal session to 16K 2015-03-27 11:53:33 +01:00
base-codezero base: refactor signal_transmitter::submit 2015-03-19 09:32:52 +01:00
base-fiasco base: refactor signal_transmitter::submit 2015-03-19 09:32:52 +01:00
base-foc base: refactor signal_transmitter::submit 2015-03-19 09:32:52 +01:00
base-host base: refactor signal_transmitter::submit 2015-03-19 09:32:52 +01:00
base-hw hw_x86_64: Do not mask edge-triggered interrupts 2015-03-27 11:53:34 +01:00
base-linux base: refactor signal_transmitter::submit 2015-03-19 09:32:52 +01:00
base-nova nova: leverage kernel to implement Genode signals 2015-03-27 11:53:11 +01:00
base-okl4 okl4: check result of bind_thread 2015-03-27 11:53:12 +01:00
base-pistachio base: refactor signal_transmitter::submit 2015-03-19 09:32:52 +01:00
dde_ipxe nic session: link-state change handling 2015-03-27 11:53:13 +01:00
dde_linux nic session: link-state change handling 2015-03-27 11:53:13 +01:00
dde_oss run: constrain physical memory for pci/acpi driver 2015-02-16 13:40:38 +01:00
dde_rump arm: enable cpu cortex_a15 compiler flag 2015-02-27 11:48:04 +01:00
demo launchpad: handle case running out of threads 2015-03-27 11:53:12 +01:00
gems gems: let run decorator-stress on 64bit 2015-03-27 11:53:12 +01:00
hello_tutorial Add filenames to code snippets in hello_tutorial 2015-01-26 12:28:42 +01:00
libports libc: use correct type for dummy libc functions 2015-03-27 11:53:16 +01:00
os os: enable PIT timer for hw_x86_64 platform 2015-03-27 11:53:34 +01:00
ports libc: use correct type for dummy libc functions 2015-03-27 11:53:16 +01:00
ports-foc Move packet stream to Genode namespace, fix #1455 2015-03-19 08:57:22 +01:00
README Remove repos/qt4, fix #1451 2015-03-19 08:57:20 +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:

  [http://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 [http://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 [http://genode.org/documentation/platforms/foc]

  :'hw':
    The hw platform allows the execution of Genode on bare ARM hardware
    without the need for a separate kernel. The kernel functionality is
    included in core.
    See [http://genode.org/documentation/platforms/hw]

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

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

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

  :'codezero':
    Codezero microkernel developed by B-Labs
    See [http://genode.org/documentation/platforms/codezero]

  :'host':
    Pseudo platform documenting the interface between the generic and
    platform-specific parts of the base framework. This is not a functional
    base platform.

:'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_oss':

  This source-code repository contains the device-driver environment for the
  audio drivers of the Open Sound System (OSS).

:'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.

:'ports-<platform>':

  These platform-specific source-code repositories contain software that
  capitalizes special features of the respective kernel platform.
  For the Fiasco.OC platform, 'ports-foc' hosts a port of the L4Linux
  kernel. For further information, please refer to the README file at the
  top level of the respective repository.

:'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'.