projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Precise Delay Loops for i386 | |
| 3 | * | |
| 4 | * Copyright (C) 1993 Linus Torvalds | |
| 5 | * Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz> | |
| 6 | * | |
| 7 | * The __delay function must _NOT_ be inlined as its execution time | |
| 8 | * depends wildly on alignment on many x86 processors. The additional | |
| 9 | * jump magic is needed to get the timing stable on all the CPU's | |
| 10 | * we have to worry about. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/config.h> | |
| 14 | #include <linux/sched.h> | |
| 15 | #include <linux/delay.h> | |
| 129f6946 | 16 | #include <linux/module.h> |
| 1da177e4 LT |
17 | #include <asm/processor.h> |
| 18 | #include <asm/delay.h> | |
| 19 | #include <asm/timer.h> | |
| 20 | ||
| 21 | #ifdef CONFIG_SMP | |
| 22 | #include <asm/smp.h> | |
| 23 | #endif | |
| 24 | ||
| 25 | extern struct timer_opts* timer; | |
| 26 | ||
| 27 | void __delay(unsigned long loops) | |
| 28 | { | |
| 29 | cur_timer->delay(loops); | |
| 30 | } | |
| 31 | ||
| 32 | inline void __const_udelay(unsigned long xloops) | |
| 33 | { | |
| 34 | int d0; | |
| 35 | xloops *= 4; | |
| 36 | __asm__("mull %0" | |
| 37 | :"=d" (xloops), "=&a" (d0) | |
| 39c715b7 | 38 | :"1" (xloops),"0" (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (HZ/4))); |
| 1da177e4 LT |
39 | __delay(++xloops); |
| 40 | } | |
| 41 | ||
| 42 | void __udelay(unsigned long usecs) | |
| 43 | { | |
| 44 | __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */ | |
| 45 | } | |
| 46 | ||
| 47 | void __ndelay(unsigned long nsecs) | |
| 48 | { | |
| 49 | __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */ | |
| 50 | } | |
| 129f6946 AD |
51 | |
| 52 | EXPORT_SYMBOL(__delay); | |
| 53 | EXPORT_SYMBOL(__const_udelay); | |
| 54 | EXPORT_SYMBOL(__udelay); | |
| 55 | EXPORT_SYMBOL(__ndelay); |