44 строки
974 B
C
44 строки
974 B
C
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#ifndef _PARISC_DELAY_H
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#define _PARISC_DELAY_H
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#include <asm/system.h> /* for mfctl() */
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#include <asm/processor.h> /* for boot_cpu_data */
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/*
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* Copyright (C) 1993 Linus Torvalds
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*
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* Delay routines
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*/
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static __inline__ void __delay(unsigned long loops) {
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asm volatile(
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" .balignl 64,0x34000034\n"
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" addib,UV -1,%0,.\n"
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" nop\n"
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: "=r" (loops) : "0" (loops));
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}
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static __inline__ void __cr16_delay(unsigned long clocks) {
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unsigned long start;
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/*
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* Note: Due to unsigned math, cr16 rollovers shouldn't be
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* a problem here. However, on 32 bit, we need to make sure
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* we don't pass in too big a value. The current default
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* value of MAX_UDELAY_MS should help prevent this.
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*/
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start = mfctl(16);
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while ((mfctl(16) - start) < clocks)
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;
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}
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static __inline__ void __udelay(unsigned long usecs) {
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__cr16_delay(usecs * ((unsigned long)boot_cpu_data.cpu_hz / 1000000UL));
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}
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#define udelay(n) __udelay(n)
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#endif /* defined(_PARISC_DELAY_H) */
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