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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-alpha/] [delay.h] - Blame information for rev 1765

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1 1632 jcastillo
#ifndef __ALPHA_DELAY_H
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#define __ALPHA_DELAY_H
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extern unsigned long loops_per_sec;
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/*
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 * Copyright (C) 1993 Linus Torvalds
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 *
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 * Delay routines, using a pre-computed "loops_per_second" value.
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 */
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extern __inline__ void __delay(unsigned long loops)
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{
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        __asm__ __volatile__(".align 3\n"
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                "1:\tsubq %0,1,%0\n\t"
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                "bge %0,1b": "=r" (loops) : "0" (loops));
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}
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/*
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 * division by multiplication: you don't have to worry about
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 * loss of precision.
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 *
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 * Use only for very small delays ( < 1 msec).  Should probably use a
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 * lookup table, really, as the multiplications take much too long with
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 * short delays.  This is a "reasonable" implementation, though (and the
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 * first constant multiplications gets optimized away if the delay is
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 * a constant)
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 */
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extern __inline__ void udelay(unsigned long usecs)
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{
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        usecs *= 0x000010c6f7a0b5edUL;          /* 2**64 / 1000000 */
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        __asm__("umulh %1,%2,%0"
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                :"=r" (usecs)
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                :"r" (usecs),"r" (loops_per_sec));
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        __delay(usecs);
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}
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/*
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 * 64-bit integers means we don't have to worry about overflow as
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 * on some other architectures..
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 */
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extern __inline__ unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c)
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{
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        return (a*b)/c;
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}
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#endif /* defined(__ALPHA_DELAY_H) */

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