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doc: Update components.txt

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Norman Feske 2013-02-27 15:00:48 +01:00
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commit 371c11829f
1 changed files with 25 additions and 22 deletions
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doc/components.txt
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@ -139,26 +139,21 @@ input-session interfaces respectively.
Timer drivers
=============
All timer drivers implement the timer-session interface. Technically, a timer
driver is both a device driver (accessing a timer device) and a resource
multiplexer (supporting multiple timer-session clients at the same time). The
timer implementations differ in their use of different time sources and the
mode of internal operation of the timer sessions. Time sources are either
hardware timers, a time source provided by the kernel, or a pseudo time source
(busy).
The timer driver located at 'os/src/drivers/timer' implements the timer-session
interface. Technically, it is is both a device driver (accessing a timer
device) and a resource multiplexer (supporting multiple timer-session clients
at the same time). Depending on the base platform, the implementation uses of
different time sources. Time sources are either hardware timers, a time source
provided by the kernel, or a pseudo time source (busy):
The internal operation of the timer session depends on the kernel. On kernels
with support for out-of-order RPCs, all timer sessions are handled by a single
thread. Otherwise, each timer session uses a dedicated thread.
:'timer/nova': PIT as time source, multi-threaded
:'timer/codezero': busy time source, single-threaded
:'timer/okl4_arm': busy time source, single-threaded
:'timer/okl4_x86': PIT as time source, single-threaded
:'timer/foc': IPC timeout as time source, multi-threaded
:'timer/fiasco': IPC timeout as time source, single-threaded
:'timer/pistachio': IPC timeout as time source, single-threaded
:'timer/linux': nanosleep as time source, single-threaded
:'nova': PIT as time source
:'codezero': busy time source
:'okl4_arm': busy time source
:'okl4_x86': PIT as time source
:'foc': IPC timeout as time source
:'fiasco': IPC timeout as time source
:'pistachio': IPC timeout as time source
:'linux': nanosleep as time source
Audio output drivers
@ -269,6 +264,11 @@ subdirectory of a source repository.
concurrently access the same FFAT-formatted block device. It is located
at 'libports/src/server/ffat_fs'.
:Terminal: The terminal_mux service located at gems/src/server/terminal_mux
is able to provide multiple terminal sessions over one terminal-client
session. The user can switch between the different sessions using a keyboard
shortcut, which brings up an ncurses-based menu.
Protocol stacks
###############
@ -334,6 +334,11 @@ Separate components:
A block service that fetches a virtual block device over the network from
a HTTP server.
:'fs_rom':
A ROM service that translates the 'File_system' session interface to the
'ROM' session' interface. Each request for a ROM file is handled by looking
up an equally named file on the file system.
Libraries:
:'libports/lib/mk/libc':
@ -454,9 +459,7 @@ Runtime environments
:'ports/src/vancouver': Vancouver is a virtual-machine monitor developed for
the use with the NOVA platform. It virtualizes 32bit x86 PC hardware
including various peripherals. The current version is regarded as work in
progress. It is able to bootstrap one of the Fiasco or Pistachio kernels
but support for interrupts (i.e., the timer) is not yet implemented.
including various peripherals.
:'os/src/server/loader': A service that allows the creation and destruction
of Genode subsystems via a session interface. For further information,