2017-02-10 21:15:45 +01:00
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/*
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* \brief Input-event filter
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* \author Norman Feske
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* \date 2017-02-01
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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2017-02-20 13:23:52 +01:00
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* under the terms of the GNU Affero General Public License version 3.
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2017-02-10 21:15:45 +01:00
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*/
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/* Genode includes */
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#include <input/component.h>
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#include <os/static_root.h>
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#include <base/component.h>
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#include <base/attached_rom_dataspace.h>
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#include <base/heap.h>
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#include <timer_session/connection.h>
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/* local includes */
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#include <input_source.h>
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#include <remap_source.h>
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#include <merge_source.h>
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#include <chargen_source.h>
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namespace Input_filter { struct Main; }
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struct Input_filter::Main : Input_connection::Avail_handler,
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Source::Factory
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{
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Env &_env;
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Attached_rom_dataspace _config { _env, "config" };
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Heap _heap { _env.ram(), _env.rm() };
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Registry<Registered<Input_connection> > _input_connections;
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typedef String<Session_label::capacity()> Label;
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/*
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* Mechanism to construct a 'Timer' on demand
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*
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* By lazily constructing the timer, the input-filter does not depend
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* on a timer service unless its configuration defines time-related
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* filtering operations like key repeat.
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*/
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struct Timer_accessor : Input_filter::Timer_accessor
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{
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struct Lazy
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{
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os/timer: interpolate time via timestamps
Previously, the Genode::Timer::curr_time always used the
Timer_session::elapsed_ms RPC as back end. Now, Genode::Timer reads
this remote time only in a periodic fashion independently from the calls
to Genode::Timer::curr_time. If now one calls Genode::Timer::curr_time,
the function takes the last read remote time value and adapts it using
the timestamp difference since the remote-time read. The conversion
factor from timestamps to time is estimated on every remote-time read
using the last read remote-time value and the timestamp difference since
the last remote time read.
This commit also re-works the timeout test. The test now has two stages.
In the first stage, it tests fast polling of the
Genode::Timer::curr_time. This stage checks the error between locally
interpolated and timer-driver time as well as wether the locally
interpolated time is monotone and sufficiently homogeneous. In the
second stage several periodic and one-shot timeouts are scheduled at
once. This stage checks if the timeouts trigger sufficiently precise.
This commit adds the new Kernel::time syscall to base-hw. The syscall is
solely used by the Genode::Timer on base-hw as substitute for the
timestamp. This is because on ARM, the timestamp function uses the ARM
performance counter that stops counting when the WFI (wait for
interrupt) instruction is active. This instruction, however is used by
the base-hw idle contexts that get active when no user thread needs to
be scheduled. Thus, the ARM performance counter is not a good choice for
time interpolation and we use the kernel internal time instead.
With this commit, the timeout library becomes a basic library. That means
that it is linked against the LDSO which then provides it to the program it
serves. Furthermore, you can't use the timeout library anymore without the
LDSO because through the kernel-dependent LDSO make-files we can achieve a
kernel-dependent timeout implementation.
This commit introduces a structured Duration type that shall successively
replace the use of Microseconds, Milliseconds, and integer types for duration
values.
Open issues:
* The timeout test fails on Raspberry PI because of precision errors in the
first stage. However, this does not render the framework unusable in general
on the RPI but merely is an issue when speaking of microseconds precision.
* If we run on ARM with another Kernel than HW the timestamp speed may
continuously vary from almost 0 up to CPU speed. The Timer, however,
only uses interpolation if the timestamp speed remained stable (12.5%
tolerance) for at least 3 observation periods. Currently, one period is
100ms, so its 300ms. As long as this is not the case,
Timer_session::elapsed_ms is called instead.
Anyway, it might happen that the CPU load was stable for some time so
interpolation becomes active and now the timestamp speed drops. In the
worst case, we would now have 100ms of slowed down time. The bad thing
about it would be, that this also affects the timeout of the period.
Thus, it might "freeze" the local time for more than 100ms.
On the other hand, if the timestamp speed suddenly raises after some
stable time, interpolated time can get too fast. This would shorten the
period but nonetheless may result in drifting away into the far future.
Now we would have the problem that we can't deliver the real time
anymore until it has caught up because the output of Timer::curr_time
shall be monotone. So, effectively local time might "freeze" again for
more than 100ms.
It would be a solution to not use the Trace::timestamp on ARM w/o HW but
a function whose return value causes the Timer to never use
interpolation because of its stability policy.
Fixes #2400
2017-04-22 00:52:23 +02:00
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Timer::Connection timer;
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2017-02-10 21:15:45 +01:00
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os/timer: interpolate time via timestamps
Previously, the Genode::Timer::curr_time always used the
Timer_session::elapsed_ms RPC as back end. Now, Genode::Timer reads
this remote time only in a periodic fashion independently from the calls
to Genode::Timer::curr_time. If now one calls Genode::Timer::curr_time,
the function takes the last read remote time value and adapts it using
the timestamp difference since the remote-time read. The conversion
factor from timestamps to time is estimated on every remote-time read
using the last read remote-time value and the timestamp difference since
the last remote time read.
This commit also re-works the timeout test. The test now has two stages.
In the first stage, it tests fast polling of the
Genode::Timer::curr_time. This stage checks the error between locally
interpolated and timer-driver time as well as wether the locally
interpolated time is monotone and sufficiently homogeneous. In the
second stage several periodic and one-shot timeouts are scheduled at
once. This stage checks if the timeouts trigger sufficiently precise.
This commit adds the new Kernel::time syscall to base-hw. The syscall is
solely used by the Genode::Timer on base-hw as substitute for the
timestamp. This is because on ARM, the timestamp function uses the ARM
performance counter that stops counting when the WFI (wait for
interrupt) instruction is active. This instruction, however is used by
the base-hw idle contexts that get active when no user thread needs to
be scheduled. Thus, the ARM performance counter is not a good choice for
time interpolation and we use the kernel internal time instead.
With this commit, the timeout library becomes a basic library. That means
that it is linked against the LDSO which then provides it to the program it
serves. Furthermore, you can't use the timeout library anymore without the
LDSO because through the kernel-dependent LDSO make-files we can achieve a
kernel-dependent timeout implementation.
This commit introduces a structured Duration type that shall successively
replace the use of Microseconds, Milliseconds, and integer types for duration
values.
Open issues:
* The timeout test fails on Raspberry PI because of precision errors in the
first stage. However, this does not render the framework unusable in general
on the RPI but merely is an issue when speaking of microseconds precision.
* If we run on ARM with another Kernel than HW the timestamp speed may
continuously vary from almost 0 up to CPU speed. The Timer, however,
only uses interpolation if the timestamp speed remained stable (12.5%
tolerance) for at least 3 observation periods. Currently, one period is
100ms, so its 300ms. As long as this is not the case,
Timer_session::elapsed_ms is called instead.
Anyway, it might happen that the CPU load was stable for some time so
interpolation becomes active and now the timestamp speed drops. In the
worst case, we would now have 100ms of slowed down time. The bad thing
about it would be, that this also affects the timeout of the period.
Thus, it might "freeze" the local time for more than 100ms.
On the other hand, if the timestamp speed suddenly raises after some
stable time, interpolated time can get too fast. This would shorten the
period but nonetheless may result in drifting away into the far future.
Now we would have the problem that we can't deliver the real time
anymore until it has caught up because the output of Timer::curr_time
shall be monotone. So, effectively local time might "freeze" again for
more than 100ms.
It would be a solution to not use the Trace::timestamp on ARM w/o HW but
a function whose return value causes the Timer to never use
interpolation because of its stability policy.
Fixes #2400
2017-04-22 00:52:23 +02:00
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Lazy(Env &env) : timer(env) { }
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2017-02-10 21:15:45 +01:00
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};
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Env &_env;
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Constructible<Lazy> lazy;
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Timer_accessor(Env &env) : _env(env) { }
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/**
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* Timer_accessor interface
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*/
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os/timer: interpolate time via timestamps
Previously, the Genode::Timer::curr_time always used the
Timer_session::elapsed_ms RPC as back end. Now, Genode::Timer reads
this remote time only in a periodic fashion independently from the calls
to Genode::Timer::curr_time. If now one calls Genode::Timer::curr_time,
the function takes the last read remote time value and adapts it using
the timestamp difference since the remote-time read. The conversion
factor from timestamps to time is estimated on every remote-time read
using the last read remote-time value and the timestamp difference since
the last remote time read.
This commit also re-works the timeout test. The test now has two stages.
In the first stage, it tests fast polling of the
Genode::Timer::curr_time. This stage checks the error between locally
interpolated and timer-driver time as well as wether the locally
interpolated time is monotone and sufficiently homogeneous. In the
second stage several periodic and one-shot timeouts are scheduled at
once. This stage checks if the timeouts trigger sufficiently precise.
This commit adds the new Kernel::time syscall to base-hw. The syscall is
solely used by the Genode::Timer on base-hw as substitute for the
timestamp. This is because on ARM, the timestamp function uses the ARM
performance counter that stops counting when the WFI (wait for
interrupt) instruction is active. This instruction, however is used by
the base-hw idle contexts that get active when no user thread needs to
be scheduled. Thus, the ARM performance counter is not a good choice for
time interpolation and we use the kernel internal time instead.
With this commit, the timeout library becomes a basic library. That means
that it is linked against the LDSO which then provides it to the program it
serves. Furthermore, you can't use the timeout library anymore without the
LDSO because through the kernel-dependent LDSO make-files we can achieve a
kernel-dependent timeout implementation.
This commit introduces a structured Duration type that shall successively
replace the use of Microseconds, Milliseconds, and integer types for duration
values.
Open issues:
* The timeout test fails on Raspberry PI because of precision errors in the
first stage. However, this does not render the framework unusable in general
on the RPI but merely is an issue when speaking of microseconds precision.
* If we run on ARM with another Kernel than HW the timestamp speed may
continuously vary from almost 0 up to CPU speed. The Timer, however,
only uses interpolation if the timestamp speed remained stable (12.5%
tolerance) for at least 3 observation periods. Currently, one period is
100ms, so its 300ms. As long as this is not the case,
Timer_session::elapsed_ms is called instead.
Anyway, it might happen that the CPU load was stable for some time so
interpolation becomes active and now the timestamp speed drops. In the
worst case, we would now have 100ms of slowed down time. The bad thing
about it would be, that this also affects the timeout of the period.
Thus, it might "freeze" the local time for more than 100ms.
On the other hand, if the timestamp speed suddenly raises after some
stable time, interpolated time can get too fast. This would shorten the
period but nonetheless may result in drifting away into the far future.
Now we would have the problem that we can't deliver the real time
anymore until it has caught up because the output of Timer::curr_time
shall be monotone. So, effectively local time might "freeze" again for
more than 100ms.
It would be a solution to not use the Trace::timestamp on ARM w/o HW but
a function whose return value causes the Timer to never use
interpolation because of its stability policy.
Fixes #2400
2017-04-22 00:52:23 +02:00
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Timer::Connection &timer() override
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2017-02-10 21:15:45 +01:00
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{
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if (!lazy.constructed())
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lazy.construct(_env);
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return lazy->timer;
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}
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} _timer_accessor { _env };
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/**
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* Pool of configuration include snippets, obtained as ROM modules
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*/
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struct Include_accessor : Input_filter::Include_accessor
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{
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struct Rom
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{
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typedef Include_accessor::Name Name;
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Registry<Rom>::Element _reg_elem;
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Name const _name;
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Attached_rom_dataspace _dataspace;
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Signal_context_capability _reconfig_sigh;
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void _handle_rom_update()
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{
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_dataspace.update();
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/* trigger reconfiguration */
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Signal_transmitter(_reconfig_sigh).submit();
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}
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Signal_handler<Rom> _rom_update_handler;
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Rom(Registry<Rom> ®istry, Env &env,
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Name const &name, Type const &type,
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Signal_context_capability reconfig_sigh)
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:
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_reg_elem(registry, *this), _name(name),
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_dataspace(env, name.string()), _reconfig_sigh(reconfig_sigh),
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_rom_update_handler(env.ep(), *this, &Rom::_handle_rom_update)
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{
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/* respond to ROM updates */
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_dataspace.sigh(_rom_update_handler);
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}
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bool has_name(Name const &name) const { return _name == name; }
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/**
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* Return ROM content as XML
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*
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* \throw Include_unavailable
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*/
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Xml_node xml(Include_accessor::Type const &type) const
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{
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Xml_node const node = _dataspace.xml();
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if (node.type() == type)
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return node;
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2017-10-25 18:00:35 +02:00
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warning("unexpected <", node.type(), "> node " "in included "
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"ROM \"", _name, "\", expected, <", type, "> node");
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2017-02-10 21:15:45 +01:00
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throw Include_unavailable();
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}
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};
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Env &_env;
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Allocator &_alloc;
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Signal_context_capability _sigh;
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Registry<Rom> _registry;
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/**
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* Return true if registry contains an include with the given name
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*/
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bool _exists(Rom::Name const &name)
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{
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bool exists = false;
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_registry.for_each([&] (Rom const &rom) {
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if (rom.has_name(name))
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exists = true; });
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return exists;
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}
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/**
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* Constructor
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*
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* \param sigh signal handler that responds to new ROM versions
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*/
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Include_accessor(Env &env, Allocator &alloc, Signal_context_capability sigh)
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:
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_env(env), _alloc(alloc), _sigh(sigh)
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{ }
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~Include_accessor()
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{
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_registry.for_each([&] (Rom &rom) { destroy(_alloc, &rom); });
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}
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void _apply_include(Name const &name, Type const &type, Functor const &fn) override
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{
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/* populate registry on demand */
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if (!_exists(name)) {
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2017-10-25 18:00:35 +02:00
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try {
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Rom &rom = *new (_alloc) Rom(_registry, _env, name, type, _sigh);
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/* \throw Include_unavailable on mismatching top-level node type */
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rom.xml(type);
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2017-02-10 21:15:45 +01:00
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}
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2017-10-25 18:00:35 +02:00
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catch (...) { throw Include_unavailable(); }
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2017-02-10 21:15:45 +01:00
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}
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/* call 'fn' with the XML content of the named include */
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Rom const *matching_rom = nullptr;
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_registry.for_each([&] (Rom const &rom) {
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if (rom.has_name(name))
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matching_rom = &rom; });
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/* this condition should never occur */
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if (!matching_rom)
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throw Include_unavailable();
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fn.apply(matching_rom->xml(type));
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}
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};
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/**
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* Maximum nesting depth of input sources, for limiting the stack usage
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*/
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unsigned _create_source_max_nesting_level = 16;
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/**
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* Source::Factory interface
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*
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* \throw Source::Invalid_config
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*/
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Source &create_source(Source::Owner &owner, Xml_node node, Source::Sink &sink) override
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{
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/*
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* Guard for the protection against too deep recursions while
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* processing the configuration.
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*/
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struct Nesting_level_guard
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{
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unsigned &level;
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Nesting_level_guard(unsigned &level) : level(level)
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{
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if (level == 0) {
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2017-10-25 18:00:35 +02:00
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warning("too many nested input sources");
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2017-02-10 21:15:45 +01:00
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throw Source::Invalid_config();
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}
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level--;
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}
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~Nesting_level_guard() { level++; }
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} nesting_level_guard { _create_source_max_nesting_level };
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/* return input source with the matching name */
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if (node.type() == Input_source::name()) {
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Label const label = node.attribute_value("name", Label());
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Input_connection *match = nullptr;
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_input_connections.for_each([&] (Input_connection &connection) {
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if (connection.label() == label)
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match = &connection; });
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if (match)
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return *new (_heap) Input_source(owner, *match, sink);
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2017-10-25 18:00:35 +02:00
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warning("input named '", label, "' does not exist");
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2017-02-10 21:15:45 +01:00
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throw Source::Invalid_config();
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}
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/* create regular filter */
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if (node.type() == Remap_source::name())
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return *new (_heap) Remap_source(owner, node, sink, *this);
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if (node.type() == Merge_source::name())
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return *new (_heap) Merge_source(owner, node, sink, *this);
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if (node.type() == Chargen_source::name())
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return *new (_heap) Chargen_source(owner, node, sink, *this, _heap,
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_timer_accessor, _include_accessor);
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2017-10-25 18:00:35 +02:00
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warning("unknown <", node.type(), "> input-source node type");
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2017-02-10 21:15:45 +01:00
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throw Source::Invalid_config();
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}
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/**
|
|
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|
* Source::Factory interface
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|
*/
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void destroy_source(Source &source) override { destroy(_heap, &source); }
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|
/*
|
|
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|
* Flag used to defer configuration updates until all input sources are
|
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|
* in their default state.
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|
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|
*/
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bool _config_update_pending = false;
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|
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/**
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|
* Return true if all input sources are in their default state
|
|
|
|
*/
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|
|
|
bool _input_connections_idle() const
|
|
|
|
{
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|
|
|
bool idle = true;
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|
|
|
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|
|
|
_input_connections.for_each([&] (Input_connection const &connection) {
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if (!connection.idle())
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|
idle = false; });
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|
return idle;
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|
}
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|
|
|
struct Output
|
|
|
|
{
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|
|
|
Source::Owner _owner;
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|
|
Source &_top_level;
|
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|
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|
|
|
/**
|
|
|
|
* Constructor
|
|
|
|
*
|
|
|
|
* \throw Source::Invalid_config
|
|
|
|
* \throw Genode::Out_of_memory
|
|
|
|
*/
|
|
|
|
Output(Xml_node output, Source::Sink &sink, Source::Factory &factory)
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|
|
|
:
|
|
|
|
_owner(factory),
|
|
|
|
_top_level(factory.create_source(_owner, Source::input_sub_node(output), sink))
|
|
|
|
{ }
|
|
|
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|
|
|
|
void generate() { _top_level.generate(); }
|
|
|
|
};
|
|
|
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|
|
|
Constructible<Output> _output;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Input session provided to our client
|
|
|
|
*/
|
|
|
|
Input::Session_component _input_session { _env, _env.ram() };
|
|
|
|
|
|
|
|
/* process events */
|
|
|
|
struct Final_sink : Source::Sink
|
|
|
|
{
|
|
|
|
Input::Session_component &_input_session;
|
|
|
|
|
|
|
|
Final_sink(Input::Session_component &input_session)
|
|
|
|
: _input_session(input_session) { }
|
|
|
|
|
|
|
|
void submit_event(Input::Event const &event) override {
|
|
|
|
_input_session.submit(event); }
|
|
|
|
|
|
|
|
} _final_sink { _input_session };
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Input_connection::Avail_handler
|
|
|
|
*/
|
|
|
|
void handle_input_avail() override
|
|
|
|
{
|
|
|
|
for (;;) {
|
|
|
|
|
|
|
|
/* fetch events in input sources */
|
|
|
|
_input_connections.for_each([&] (Input_connection &connection) {
|
|
|
|
connection.flush(); });
|
|
|
|
|
|
|
|
bool pending = false;
|
|
|
|
|
|
|
|
_input_connections.for_each([&] (Input_connection &connection) {
|
|
|
|
pending |= connection.pending(); });
|
|
|
|
|
|
|
|
if (pending && _output.constructed())
|
|
|
|
_output->generate();
|
|
|
|
|
|
|
|
if (_config_update_pending && _input_connections_idle())
|
|
|
|
Signal_transmitter(_config_handler).submit();
|
|
|
|
|
|
|
|
/* stop if no events are pending */
|
|
|
|
if (!pending)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
Static_root<Input::Session> _input_root { _env.ep().manage(_input_session) };
|
|
|
|
|
|
|
|
void _handle_config()
|
|
|
|
{
|
|
|
|
_config.update();
|
|
|
|
|
|
|
|
bool const force = _config.xml().attribute_value("force", false);
|
|
|
|
bool const idle = _input_connections_idle();
|
|
|
|
|
|
|
|
/* defer reconfiguration until all sources are idle */
|
|
|
|
if (!idle && !force) {
|
|
|
|
_config_update_pending = true;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!idle)
|
|
|
|
warning("force reconfiguration while input state is not idle");
|
|
|
|
|
|
|
|
_apply_config();
|
|
|
|
}
|
|
|
|
|
|
|
|
void _apply_config()
|
|
|
|
{
|
|
|
|
_input_connections.for_each([&] (Registered<Input_connection> &conn) {
|
|
|
|
destroy(_heap, &conn); });
|
|
|
|
|
|
|
|
_config.xml().for_each_sub_node("input", [&] (Xml_node input_node) {
|
|
|
|
|
|
|
|
try {
|
|
|
|
Label const label =
|
|
|
|
input_node.attribute_value("label", Label());
|
|
|
|
|
|
|
|
try {
|
2017-05-02 17:35:01 +02:00
|
|
|
new (_heap)
|
2017-02-10 21:15:45 +01:00
|
|
|
Registered<Input_connection>(_input_connections, _env,
|
|
|
|
label, *this, _heap);
|
|
|
|
}
|
2017-10-25 18:00:35 +02:00
|
|
|
catch (Genode::Service_denied) {
|
|
|
|
warning("parent denied input source '", label, "'"); }
|
2017-02-10 21:15:45 +01:00
|
|
|
}
|
2017-10-25 18:00:35 +02:00
|
|
|
catch (Xml_node::Nonexistent_attribute) {
|
|
|
|
warning("ignoring invalid input node '", input_node); }
|
2017-02-10 21:15:45 +01:00
|
|
|
});
|
|
|
|
|
|
|
|
try {
|
|
|
|
if (_config.xml().has_sub_node("output"))
|
|
|
|
_output.construct(_config.xml().sub_node("output"),
|
|
|
|
_final_sink, *this);
|
2017-10-25 18:00:35 +02:00
|
|
|
}
|
|
|
|
catch (Source::Invalid_config) {
|
|
|
|
warning("invalid <output> configuration"); }
|
2017-02-10 21:15:45 +01:00
|
|
|
|
2017-10-25 18:00:35 +02:00
|
|
|
catch (Allocator::Out_of_memory) {
|
2017-02-10 21:15:45 +01:00
|
|
|
error("out of memory while constructing filter chain"); }
|
|
|
|
|
|
|
|
_config_update_pending = false;
|
|
|
|
}
|
|
|
|
|
|
|
|
Signal_handler<Main> _config_handler
|
|
|
|
{ _env.ep(), *this, &Main::_handle_config };
|
|
|
|
|
|
|
|
Include_accessor _include_accessor { _env, _heap, _config_handler };
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Constructor
|
|
|
|
*/
|
|
|
|
Main(Genode::Env &env) : _env(env)
|
|
|
|
{
|
|
|
|
_input_session.event_queue().enabled(true);
|
|
|
|
_config.sigh(_config_handler);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Apply initial configuration
|
|
|
|
*/
|
|
|
|
_apply_config();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Announce service
|
|
|
|
*/
|
|
|
|
_env.parent().announce(_env.ep().manage(_input_root));
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
void Component::construct(Genode::Env &env) { static Input_filter::Main inst(env); }
|