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/******************************************************************************
* flushtlb.h
*
* TLB flushes are timestamped using a global virtual 'clock' which ticks
* on any TLB flush on any processor.
*
* Copyright (c) 2003, K A Fraser
*/
#ifndef __FLUSHTLB_H__
#define __FLUSHTLB_H__
#include <xeno/smp.h>
/*
* Every GLOBAL_FLUSH_PERIOD ticks of the tlbflush clock, every TLB in the
* system is guaranteed to have been flushed.
*/
#define GLOBAL_FLUSH_PERIOD (1<<16)
/*
* '_cpu_stamp' is the current timestamp for the CPU we are testing.
* '_lastuse_stamp' is a timestamp taken when the PFN we are testing was last
* used for a purpose that may have caused the CPU's TLB to become tainted.
*/
#define NEED_FLUSH(_cpu_stamp, _lastuse_stamp) \
(((_cpu_stamp) > (_lastuse_stamp)) || \
(((_lastuse_stamp) - (_cpu_stamp)) > (2*GLOBAL_FLUSH_PERIOD)))
extern unsigned long tlbflush_mask;
extern unsigned long tlbflush_clock;
extern unsigned long tlbflush_time[NR_CPUS];
extern void new_tlbflush_clock_period(void);
extern void write_cr3_counted(unsigned long pa);
extern void flush_tlb_counted(void);
#endif /* __FLUSHTLB_H__ */
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