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#include <linux/config.h>

#include <linux/sched.h> /* for udelay's use of smp_processor_id */

#include <asm/param.h>

#include <asm/smp.h>

#include <linux/delay.h>

/*

 * Copyright (C) 1993, 2000 Linus Torvalds

 *

 * Delay routines, using a pre-computed "loops_per_jiffy" value.

 */

/*

 * Use only for very small delays (< 1 msec).

 *

 * The active part of our cycle counter is only 32-bits wide, and

 * we're treating the difference between two marks as signed.  On

 * a 1GHz box, that's about 2 seconds.

 */

void

__delay(int loops)

{

        int tmp;

        __asm__ __volatile__(

                "       rpcc %0\n"

                "       addl %1,%0,%1\n"

                "1:     rpcc %0\n"

                "       subl %1,%0,%0\n"

                "       bgt %0,1b"

                : "=&r" (tmp), "=r" (loops) : "1"(loops));

}

#ifdef CONFIG_SMP

#define LPJ     cpu_data[smp_processor_id()].loops_per_jiffy

#else

#define LPJ     loops_per_jiffy

#endif

void

ndelay(unsigned long nsecs)

{

        nsecs *= (((unsigned long)HZ << 32) / 1000000000) * LPJ;

        __delay((long)nsecs >> 32);

}

void

udelay(unsigned long usecs)

{

        usecs *= (((unsigned long)HZ << 32) / 1000000) * LPJ;

        __delay((long)usecs >> 32);

}