FreeBSD::UDelayEvent Class Reference

A class to skip udelay() and related calls in the kernel. More...

#include <events.hh>

Inheritance diagram for FreeBSD::UDelayEvent:

Public Member Functions
	UDelayEvent (PCEventQueue *q, const std::string &desc, Addr addr, uint64_t mult, uint64_t div)
virtual void	process (ThreadContext *xc)
Public Member Functions inherited from SkipFuncEvent
	SkipFuncEvent (PCEventQueue *q, const std::string &desc, Addr addr)
Public Member Functions inherited from PCEvent
	PCEvent (PCEventQueue *q, const std::string &desc, Addr pc)
virtual	~PCEvent ()
virtual const std::string	name () const
std::string	descr () const
Addr	pc () const
bool	remove ()

Private Attributes
uint64_t	argDivToNs
	value to divide arg by to create ns. More...
uint64_t	argMultToNs
	value to multiple arg by to create ns. More...

Additional Inherited Members
Protected Attributes inherited from PCEvent
std::string	description
PCEventQueue *	queue
Addr	evpc

Detailed Description

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.

Definition at line 45 of file events.hh.

Constructor & Destructor Documentation

FreeBSD::UDelayEvent::UDelayEvent ( PCEventQueue *  q, const std::string &  desc, Addr  addr, uint64_t  mult, uint64_t  div  )

inline

Definition at line 60 of file events.hh.

Member Function Documentation

void FreeBSD::UDelayEvent::process ( ThreadContext *  xc )

virtual

Reimplemented from SkipFuncEvent.

Definition at line 49 of file events.cc.

References argDivToNs, argMultToNs, AlphaISA::getArgument(), SkipFuncEvent::process(), and PseudoInst::quiesceNs().

Member Data Documentation

uint64_t FreeBSD::UDelayEvent::argDivToNs

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.

Definition at line 52 of file events.hh.

Referenced by process().

uint64_t FreeBSD::UDelayEvent::argMultToNs

private

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.

Definition at line 57 of file events.hh.

Referenced by process().

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The documentation for this class was generated from the following files:

• kern/freebsd/events.hh
• kern/freebsd/events.cc