linux/arch/um/sys-x86_64/delay.c
Jeff Dike 060e352236 [PATCH] uml: Delay loop cleanups
This patch cleans up the delay implementations a bit, makes the loops
unoptimizable, and exports __udelay and __const_udelay.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-20 15:48:17 -07:00

42 lines
711 B
C

/*
* Copyright 2003 PathScale, Inc.
* Copied from arch/x86_64
*
* Licensed under the GPL
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <asm/processor.h>
#include <asm/param.h>
void __delay(unsigned long loops)
{
unsigned long i;
for(i = 0; i < loops; i++)
cpu_relax();
}
void __udelay(unsigned long usecs)
{
unsigned long i, n;
n = (loops_per_jiffy * HZ * usecs) / MILLION;
for(i=0;i<n;i++)
cpu_relax();
}
EXPORT_SYMBOL(__udelay);
void __const_udelay(unsigned long usecs)
{
unsigned long i, n;
n = (loops_per_jiffy * HZ * usecs) / MILLION;
for(i=0;i<n;i++)
cpu_relax();
}
EXPORT_SYMBOL(__const_udelay);