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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-i386/] [delay.h] - Blame information for rev 1765

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1 1633 jcastillo
#ifndef _I386_DELAY_H
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#define _I386_DELAY_H
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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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#include <linux/linkage.h>
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#ifdef __SMP__
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#include <asm/smp.h>
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#endif 
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extern void __do_delay(void);   /* Special register call calling convention */
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extern __inline__ void __delay(int loops)
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{
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        __asm__ __volatile__(
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                "call " SYMBOL_NAME_STR(__do_delay)
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                :/* no outputs */
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                :"a" (loops)
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                :"ax");
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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 *= 0x000010c6;            /* 2**32 / 1000000 */
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        __asm__("mull %0"
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                :"=d" (usecs)
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#ifdef __SMP__
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                :"a" (usecs),"0" (cpu_data[smp_processor_id()].udelay_val)
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#else
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                :"a" (usecs),"0" (loops_per_sec)
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#endif
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                :"ax");
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        __delay(usecs);
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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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        __asm__("mull %1 ; divl %2"
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                :"=a" (a)
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                :"d" (b),
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                 "r" (c),
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                 "0" (a)
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                :"dx");
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        return a;
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}
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#endif /* defined(_I386_DELAY_H) */

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