From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/i386/lib/delay.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 arch/i386/lib/delay.c (limited to 'arch/i386/lib/delay.c') diff --git a/arch/i386/lib/delay.c b/arch/i386/lib/delay.c new file mode 100644 index 000000000000..080639f262b1 --- /dev/null +++ b/arch/i386/lib/delay.c @@ -0,0 +1,49 @@ +/* + * Precise Delay Loops for i386 + * + * Copyright (C) 1993 Linus Torvalds + * Copyright (C) 1997 Martin Mares + * + * The __delay function must _NOT_ be inlined as its execution time + * depends wildly on alignment on many x86 processors. The additional + * jump magic is needed to get the timing stable on all the CPU's + * we have to worry about. + */ + +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_SMP +#include +#endif + +extern struct timer_opts* timer; + +void __delay(unsigned long loops) +{ + cur_timer->delay(loops); +} + +inline void __const_udelay(unsigned long xloops) +{ + int d0; + xloops *= 4; + __asm__("mull %0" + :"=d" (xloops), "=&a" (d0) + :"1" (xloops),"0" (cpu_data[_smp_processor_id()].loops_per_jiffy * (HZ/4))); + __delay(++xloops); +} + +void __udelay(unsigned long usecs) +{ + __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */ +} + +void __ndelay(unsigned long nsecs) +{ + __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */ +} -- cgit v1.2.3