genode/repos/dde_linux/src/include/lx_emul/impl/timer.h
Josef Söntgen 0106045bad lx_kit: add modular lx_emul backend
The modular lx_kit seperates the required back end functionality of the
Linux emulation environment from the front end. Thereby each driver can
reuse specific parts or supply more suitable implementations by itself.
It is used to reduce the amount of redundant code in each driver.

The lx_kit is split into several layers whose structure is as follows:

The first layer in _repos/dde_linux/src/include/lx_emul_ contains those
header files that provide the structural definitions and function
declarations of the Linux API, e.g. _errno.h_ provides all error code
values. The second layer in _repos/dde_linux/src/include/lx_emul/impl_
contains the implementation of selected functions, e.g. _slab.h_
provides the implementation of 'kmalloc()'. The lx_kit back end API is
the third layer and provides the _Lx::Malloc_ interface
(_repos/dde_linux/src/include/lx_kit/malloc.h_) which is used to
implement 'kmalloc()'. There are several generic implementations of the
lx_kit interfaces that can be used by a driver.

A driver typically includes a 'lx_emul/impl/xyz.h' header once
directly in its lx_emul compilation unit. The lx_kit interface files
are only included in those compilation units that use or implement the
interface. If a driver wants to use a generic implementation it must
add the source file to its source file list. The generic
implementations are located in _repos/dde_linux/src/lx_kit/_.

The modular lx_kit still depends on the private _lx_emul.h_ header file
that is tailored to each driver. Since the lx_kit already contains much
of the declarations and definitions that were originally placed in
these private header files, those files can now ommit a large amount
of code.

Fixes #1974.
2016-05-26 15:54:10 +02:00

78 lines
1.5 KiB
C

/*
* \brief Implementation of linux/timer.h
* \author Norman Feske
* \date 2015-09-09
*/
/*
* Copyright (C) 2015-2016 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
/* Linux kit includes */
#include <lx_kit/timer.h>
void init_timer(struct timer_list *timer) { }
int mod_timer(struct timer_list *timer, unsigned long expires)
{
if (!Lx::timer().find(timer))
Lx::timer().add(timer, Lx::Timer::LIST);
return Lx::timer().schedule(timer, expires);
}
void setup_timer(struct timer_list *timer,void (*function)(unsigned long),
unsigned long data)
{
timer->function = function;
timer->data = data;
init_timer(timer);
}
int timer_pending(const struct timer_list *timer)
{
bool pending = Lx::timer().pending(timer);
return pending;
}
int del_timer(struct timer_list *timer)
{
int rv = Lx::timer().del(timer);
Lx::timer().schedule_next();
return rv;
}
void hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) { }
int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
unsigned long delta_ns, const enum hrtimer_mode mode)
{
unsigned long expires = tim.tv64 / (NSEC_PER_MSEC * HZ);
if (!Lx::timer().find(timer))
Lx::timer().add(timer, Lx::Timer::HR);
return Lx::timer().schedule(timer, expires);
}
int hrtimer_cancel(struct hrtimer *timer)
{
int rv = Lx::timer().del(timer);
Lx::timer().schedule_next();
return rv;
}