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Diffstat (limited to 'src/kern/freebsd/events.hh')
-rw-r--r-- | src/kern/freebsd/events.hh | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/kern/freebsd/events.hh b/src/kern/freebsd/events.hh new file mode 100644 index 000000000..1d3faa935 --- /dev/null +++ b/src/kern/freebsd/events.hh @@ -0,0 +1,68 @@ +/* + * 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 |