genode/repos/base/src/timer/fiasco/time_source.cc

95 lines
2.2 KiB
C++

/*
* \brief Time source that uses sleeping by the means of the kernel
* \author Christian Helmuth
* \author Norman Feske
* \author Martin Stein
* \date 2006-08-30
*/
/*
* Copyright (C) 2006-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
/* Genode includes */
#include <util/misc_math.h>
#include <base/attached_rom_dataspace.h>
/* Fiasco includes */
namespace Fiasco {
#include <l4/sys/ipc.h>
#include <l4/sys/kip.h>
}
/*
* On L4/Fiasco, the KIP layout is defined in 'kernel.h', which does not exist
* on Fiasco.OC. We test for 'L4_SYS_KIP_H__' to check for the L4/Fiasco case
* and include 'kernel.h'. This works because the Fiasco.OC headers do not use
* include guards ('L4_SYS_KIP_H__' is undefined on Fiasco.OC).
*/
#ifdef L4_SYS_KIP_H__
namespace Fiasco {
#include <l4/sys/kernel.h>
}
#endif /* L4_SYS_KIP_H__ */
/* local includes */
#include <time_source.h>
using namespace Fiasco;
using Microseconds = Genode::Microseconds;
using Duration = Genode::Duration;
using Genode::uint64_t;
static l4_timeout_s mus_to_timeout(uint64_t mus)
{
if (mus == 0)
return L4_IPC_TIMEOUT_0;
else if (mus == ~(uint64_t)0)
return L4_IPC_TIMEOUT_NEVER;
long e = Genode::log2((unsigned long)mus) - 7;
unsigned long m;
if (e < 0) e = 0;
m = mus / (1UL << e);
/* check corner case */
if ((e > 31 ) || (m > 1023)) {
Genode::warning("invalid timeout ", mus, ", using max. values");
e = 0;
m = 1023;
}
return l4_timeout_rel(m, e);
}
Microseconds Timer::Time_source::max_timeout() const
{
Genode::Lock::Guard lock_guard(_lock);
return Microseconds(1000 * 1000 * 100);
}
Duration Timer::Time_source::curr_time()
{
Genode::Lock::Guard lock_guard(_lock);
static Genode::Attached_rom_dataspace kip_ds(_env, "l4v2_kip");
static Fiasco::l4_kernel_info_t * const kip =
kip_ds.local_addr<Fiasco::l4_kernel_info_t>();
#ifdef L4_SYS_KIP_H__
Fiasco::l4_cpu_time_t const clock = kip->clock;
#else
Fiasco::l4_cpu_time_t const clock = Fiasco::l4_kip_clock(kip);
#endif
return Duration(Microseconds(clock));
}
void Timer::Time_source::_usleep(uint64_t usecs) {
l4_ipc_sleep(l4_timeout(L4_IPC_TIMEOUT_NEVER, mus_to_timeout(usecs))); }