73 lines
1.3 KiB
C++
73 lines
1.3 KiB
C++
/*
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* \brief Fiasco-specific sleep implementation
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* \author Christian Helmuth
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* \author Norman Feske
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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 <base/printf.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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}
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/* local includes */
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#include "timer_session_component.h"
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using namespace Fiasco;
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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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PWRN("invalid timeout %ld, using max. values\n", mus);
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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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unsigned long Platform_timer::max_timeout()
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{
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Genode::Lock::Guard lock_guard(_lock);
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return 1000*1000;
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}
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unsigned long Platform_timer::curr_time() const
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{
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Genode::Lock::Guard lock_guard(_lock);
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return _curr_time_usec;
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}
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void Platform_timer::_usleep(unsigned long usecs)
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{
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l4_ipc_sleep(l4_timeout(L4_IPC_TIMEOUT_NEVER, mus_to_timeout(usecs)));
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_curr_time_usec += usecs;
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}
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