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author | iap10@labyrinth.cl.cam.ac.uk <iap10@labyrinth.cl.cam.ac.uk> | 2004-01-12 08:53:30 +0000 |
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committer | iap10@labyrinth.cl.cam.ac.uk <iap10@labyrinth.cl.cam.ac.uk> | 2004-01-12 08:53:30 +0000 |
commit | 6b5b22582f098f13cce9926f03d17092789ffa5e (patch) | |
tree | c5d9ac81db9517973b9a74fb017f1c9c90fca012 /xenolinux-2.4.24-sparse/arch/xeno/lib/delay.c | |
parent | abc73fe73e5760d1f6836ea098813f4d65d2c097 (diff) | |
download | xen-6b5b22582f098f13cce9926f03d17092789ffa5e.tar.gz xen-6b5b22582f098f13cce9926f03d17092789ffa5e.tar.bz2 xen-6b5b22582f098f13cce9926f03d17092789ffa5e.zip |
bitkeeper revision 1.671 (4002608aofyioMya1eWuIFZIJHQO4Q)
Upgrade to Linux version 2.4.24
Diffstat (limited to 'xenolinux-2.4.24-sparse/arch/xeno/lib/delay.c')
-rw-r--r-- | xenolinux-2.4.24-sparse/arch/xeno/lib/delay.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/xenolinux-2.4.24-sparse/arch/xeno/lib/delay.c b/xenolinux-2.4.24-sparse/arch/xeno/lib/delay.c new file mode 100644 index 0000000000..0035bed074 --- /dev/null +++ b/xenolinux-2.4.24-sparse/arch/xeno/lib/delay.c @@ -0,0 +1,52 @@ +/* + * 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> + +#ifdef CONFIG_SMP +#include <asm/smp.h> +#endif + +void __delay(unsigned long loops) +{ + unsigned long bclock, now; + + rdtscl(bclock); + do + { + rep_nop(); + rdtscl(now); + } while ((now-bclock) < loops); +} + +inline void __const_udelay(unsigned long xloops) +{ + int d0; + __asm__("mull %0" + :"=d" (xloops), "=&a" (d0) + :"1" (xloops),"0" (current_cpu_data.loops_per_jiffy)); + __delay(xloops * HZ); +} + +void __udelay(unsigned long usecs) +{ + __const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */ +} + +void __ndelay(unsigned long nsecs) +{ + __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */ +} |