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/*
* Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
* All rights reserved.
*
* This software was developed by the University of Cambridge Computer
* Laboratory as part of the CTSRD Project, with support from the UK Higher
* Education Innovation Fund (HEIF).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __KERN_FREEBSD_EVENTS_HH__
#define __KERN_FREEBSD_EVENTS_HH__
#include "kern/system_events.hh"
namespace FreeBSD {
/** A class to skip udelay() and related calls in the kernel.
* This class has two additional parameters that take the argument to udelay and
* manipulated it to come up with ns and eventually ticks to quiesce for.
* See descriptions of argDivToNs and argMultToNs below.
*/
class UDelayEvent : public SkipFuncEvent
{
private:
/** value to divide arg by to create ns. This is present beacues the linux
* kernel code sometime precomputes the first multiply that is done in
* udelay() if the parameter is a constant. We need to undo it so here is
* how. */
uint64_t argDivToNs;
/** value to multiple arg by to create ns. Nominally, this is 1000 to
* convert us to ns, but since linux can do some preprocessing of constant
* values something else might be required. */
uint64_t argMultToNs;
public:
UDelayEvent(PCEventQueue *q, const std::string &desc, Addr addr,
uint64_t mult, uint64_t div)
: SkipFuncEvent(q, desc, addr), argDivToNs(div), argMultToNs(mult) {}
virtual void process(ThreadContext *xc);
};
}
#endif
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