| /* |
| * Precise Delay Loops for i386 |
| * |
| * Copyright (C) 1993 Linus Torvalds |
| * Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
| * |
| * 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 <linux/config.h> |
| #include <linux/sched.h> |
| #include <linux/delay.h> |
| #include <asm/processor.h> |
| #include <asm/delay.h> |
| #include <asm/timer.h> |
| |
| #ifdef CONFIG_SMP |
| #include <asm/smp.h> |
| #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[raw_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) */ |
| } |