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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [sh64/] [lib/] [udelay.c] - Rev 1275
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/* * Copyright (C) 1993, 2000 Linus Torvalds * * Delay routines, using a pre-computed "loops_per_jiffy" value. */ #include <linux/config.h> #include <linux/sched.h> #include <asm/param.h> #include <asm/smp.h> #include <linux/delay.h> /* * 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) { long long dummy; __asm__ __volatile__("gettr " __t0 ", %1\n\t" "_pta 4, " __t0 "\n\t" "addi %0, -1, %0\n\t" "bne %0, r63, " __t0 "\n\t" "ptabs %1, " __t0 "\n\t":"=r"(loops), "=r"(dummy) :"0"(loops)); } void __udelay(unsigned long long usecs, unsigned long lpj) { usecs *= (((unsigned long long) HZ << 32) / 1000000) * lpj; __delay((long long) usecs >> 32); } void __ndelay(unsigned long long nsecs, unsigned long lpj) { nsecs *= (((unsigned long long) HZ << 32) / 1000000000) * lpj; __delay((long long) nsecs >> 32); } void udelay(unsigned long usecs) { __udelay(usecs, loops_per_jiffy); } void ndelay(unsigned long nsecs) { __ndelay(nsecs, loops_per_jiffy); }
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