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usb: use hardware timer to update jiffies

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This takes a lot of load away because we don't need to call the time server on
each IRQ.

Fixes #1999
This commit is contained in:
Sebastian Sumpf
2016-06-06 10:58:48 +02:00
committed by Christian Helmuth
parent 5e6c3a979e
commit 597cdc846c
3 changed files with 140 additions and 1 deletions
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12
repos/dde_linux/src/lx_kit/timer.cc
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@ -86,6 +86,7 @@ class Lx_kit::Timer : public Lx::Timer
Lx::Task _timer_task;
Genode::Signal_rpc_member<Lx_kit::Timer> _dispatcher;
Genode::Tslab<Context, 32 * sizeof(Context)> _timer_alloc;
Lx::jiffies_update_func _jiffies_func = nullptr;
/**
* Lookup local timer
@ -289,7 +290,10 @@ class Lx_kit::Timer : public Lx::Timer
}
void update_jiffies() {
_jiffies = msecs_to_jiffies(_timer_conn.elapsed_ms()); }
_jiffies = _jiffies_func ? _jiffies_func() : msecs_to_jiffies(_timer_conn.elapsed_ms()); }
void register_jiffies_func(Lx::jiffies_update_func func) {
_jiffies_func = func; }
};
@ -308,3 +312,9 @@ void Lx::timer_update_jiffies()
{
timer().update_jiffies();
}
void Lx::register_jiffies_func(jiffies_update_func func)
{
dynamic_cast<Lx_kit::Timer &>(timer()).register_jiffies_func(func);
}