87 lines
2.0 KiB
C++
87 lines
2.0 KiB
C++
/*
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* \brief Time source that uses sleeping by the means of the kernel
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* \author Christian Helmuth
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* \author Norman Feske
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* \author Martin Stein
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* \date 2006-08-30
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*/
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/*
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* Copyright (C) 2006-2013 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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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <util/misc_math.h>
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#include <os/attached_rom_dataspace.h>
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/* Fiasco includes */
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namespace Fiasco {
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#include <l4/sys/ipc.h>
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#include <l4/sys/kip.h>
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}
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/*
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* On L4/Fiasco, the KIP layout is defined in 'kernel.h', which does not exist
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* on Fiasco.OC. We test for 'L4_SYS_KIP_H__' to check for the L4/Fiasco case
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* and include 'kernel.h'. This works because the Fiasco.OC headers do not use
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* include guards ('L4_SYS_KIP_H__' is undefined on Fiasco.OC).
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*/
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#ifdef L4_SYS_KIP_H__
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namespace Fiasco {
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#include <l4/sys/kernel.h>
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}
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#endif /* L4_SYS_KIP_H__ */
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/* local includes */
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#include <time_source.h>
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using namespace Fiasco;
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using Microseconds = Genode::Time_source::Microseconds;
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static l4_timeout_s mus_to_timeout(unsigned long mus)
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{
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if (mus == 0)
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return L4_IPC_TIMEOUT_0;
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else if (mus == ~0UL)
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return L4_IPC_TIMEOUT_NEVER;
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long e = Genode::log2(mus) - 7;
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unsigned long m;
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if (e < 0) e = 0;
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m = mus / (1UL << e);
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/* check corner case */
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if ((e > 31 ) || (m > 1023)) {
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Genode::warning("invalid timeout ", mus, ", using max. values");
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e = 0;
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m = 1023;
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}
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return l4_timeout_rel(m, e);
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}
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Microseconds Timer::Time_source::max_timeout() const
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{
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Genode::Lock::Guard lock_guard(_lock);
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return Microseconds(1000 * 1000 * 100);
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}
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Microseconds Timer::Time_source::curr_time() const
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{
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Genode::Lock::Guard lock_guard(_lock);
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static Genode::Attached_rom_dataspace kip_ds("l4v2_kip");
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static Fiasco::l4_kernel_info_t * const kip =
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kip_ds.local_addr<Fiasco::l4_kernel_info_t>();
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return Microseconds(kip->clock);
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}
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void Timer::Time_source::_usleep(unsigned long usecs) {
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l4_ipc_sleep(l4_timeout(L4_IPC_TIMEOUT_NEVER, mus_to_timeout(usecs))); }
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