Adds event based scheduling logic to the kernel. Updates
management of timeouts, timers, idling etc. based on
time tracked at events rather than periodic ticks. Provides
interfaces for timers to announce and get next timer expiry
based on kernel scheduling decisions involving time slicing
of threads, timeouts and idling. Uses wall time units instead
of ticks in all scheduling activities.
The implementation involves changes in the following areas
1. Management of time in wall units like ms/us instead of ticks
The existing implementation already had an option to configure
number of ticks in a second. The new implementation builds on
top of that feature and provides option to set the size of the
scheduling granurality to mili seconds or micro seconds. This
allows most of the current implementation to be reused. Due to
this re-use and co-existence with tick based kernel, the names
of variables may contain the word "tick". However, in the
tickless kernel implementation, it represents the currently
configured time unit, which would be be mili seconds or
micro seconds. The APIs that take time as a parameter are not
impacted and they continue to pass time in mili seconds.
2. Timers would not be programmed in periodic mode
generating ticks. Instead they would be programmed in one
shot mode to generate events at the time the kernel scheduler
needs to gain control for its scheduling activities like
timers, timeouts, time slicing, idling etc.
3. The scheduler provides interfaces that the timer drivers
use to announce elapsed time and get the next time the scheduler
needs a timer event. It is possible that the scheduler may not
need another timer event, in which case the system would wait
for a non-timer event to wake it up if it is idling.
4. New APIs are defined to be implemented by timer drivers. Also
they need to handler timer events differently. These changes
have been done in the HPET timer driver. In future other timers
that support tickles kernel should implement these APIs as well.
These APIs are to re-program the timer, update and announce
elapsed time.
5. Philosopher and timer_api applications have been enabled to
test tickless kernel. Separate configuration files are created
which define the necessary CONFIG flags. Run these apps using
following command
make pristine && make BOARD=qemu_x86 CONF_FILE=prj_tickless.conf qemu
Jira: ZEP-339 ZEP-1946 ZEP-948
Change-Id: I7d950c31bf1ff929a9066fad42c2f0559a2e5983
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
At the moment CC2520 configuration options are selected inside "TI
CC2520 Driver RAW channe" submenu like:
[*] TI CC2520 Driver support ----
[ ] TI CC2520 Driver RAW channel --->
Make RAW channel depends on TI CC2520.
Change-Id: I92879b7f4391f1842c012b6c03c78956e90b9441
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
This commit changes Kconfig prefix for ieee802154 drivers to
IEEE802154_*. This is done for consistency with config prefixes
used in other subsystems.
Change-Id: Ibbb4d96d2b748f4f13135bde85304ec34c5a90a6
Signed-off-by: Wojciech Bober <wojciech.bober@nordicsemi.no>
Add TI CC2520 driver allowing RAW access to radio interface similar
way Bluetooth user channel works. This makes possible to handle radio
channel inside external 802.15.4 stacks, for example export it over USB
and handle in Linux.
Change-Id: I61bb4c8b998ff1e47dc65427ac471f04ec8fea63
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Making sure we build cc2520 driver when native IP stack is used.
Change-Id: I25f3cb38a2da0c7a54ac4befcea217dc70b31028
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
These options were only needed for a MyNewt-based nRF51 firmware on
these boards (the MyNewt BLE stack is called Nimble, hence the
prj_nimble.conf sample config files). With a Zephyr-based nRF51
firmware these options are no-longer needed, so it's not appropriate
to have them default to enabled. Instead, if they are needed, require
the app-specific configuration to enable them.
Change-Id: Iefbee4d97590af4e11bcedea05fe61f32a147b83
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Introduce an architecture sorting of boards. This is to allow for
easier maintenance going forward as the number of boards grows. It
will be easier for any scripts to know the board/arch mapping without
having to maintain an explicit list of what boards are associated with
which arch. We can also do things like have architecture maintainers
cover reviews and branches for arch/${ARCH} and boards/${ARCH} going
forward.
Change-Id: I02e0a30292b31fad58fb5dfab2682ad1c5a7d5a7
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Johan Hedberg