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#ifndef _ASM_IA64_DELAY_H
#define _ASM_IA64_DELAY_H
/*
* Delay routines using a pre-computed "cycles/usec" value.
*
* Copyright (C) 1998, 1999 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
* Copyright (C) 1999 VA Linux Systems
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
* Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
* Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/compiler.h>
#include <asm/intrinsics.h>
#include <asm/processor.h>
static __inline__ void
ia64_set_itm (unsigned long val)
{
ia64_setreg(_IA64_REG_CR_ITM, val);
ia64_srlz_d();
}
static __inline__ unsigned long
ia64_get_itm (void)
{
unsigned long result;
result = ia64_getreg(_IA64_REG_CR_ITM);
ia64_srlz_d();
return result;
}
static __inline__ void
ia64_set_itv (unsigned long val)
{
ia64_setreg(_IA64_REG_CR_ITV, val);
ia64_srlz_d();
}
static __inline__ unsigned long
ia64_get_itv (void)
{
return ia64_getreg(_IA64_REG_CR_ITV);
}
static __inline__ void
ia64_set_itc (unsigned long val)
{
ia64_setreg(_IA64_REG_AR_ITC, val);
ia64_srlz_d();
}
static __inline__ unsigned long
ia64_get_itc (void)
{
unsigned long result;
result = ia64_getreg(_IA64_REG_AR_ITC);
ia64_barrier();
#ifdef CONFIG_ITANIUM
while (unlikely((__s32) result == -1)) {
result = ia64_getreg(_IA64_REG_AR_ITC);
ia64_barrier();
}
#endif
return result;
}
extern void ia64_delay_loop (unsigned long loops);
static __inline__ void
__delay (unsigned long loops)
{
if (unlikely(loops < 1))
return;
ia64_delay_loop (loops - 1);
}
static __inline__ void
udelay (unsigned long usecs)
{
unsigned long start = ia64_get_itc();
unsigned long cycles = usecs*local_cpu_data->cyc_per_usec;
while (ia64_get_itc() - start < cycles)
cpu_relax();
}
#endif /* _ASM_IA64_DELAY_H */
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