debuggers.hg

view xen/include/asm-ia64/linux/asm/timex.h @ 0:7d21f7218375

Exact replica of unstable on 051908 + README-this
author Mukesh Rathor
date Mon May 19 15:34:57 2008 -0700 (2008-05-19)
parents
children 1ee9236cc224
line source
1 #ifndef _ASM_IA64_TIMEX_H
2 #define _ASM_IA64_TIMEX_H
4 /*
5 * Copyright (C) 1998-2001, 2003 Hewlett-Packard Co
6 * David Mosberger-Tang <davidm@hpl.hp.com>
7 */
8 /*
9 * 2001/01/18 davidm Removed CLOCK_TICK_RATE. It makes no sense on IA-64.
10 * Also removed cacheflush_time as it's entirely unused.
11 */
13 #include <asm/intrinsics.h>
14 #include <asm/processor.h>
16 typedef unsigned long cycles_t;
18 /*
19 * For performance reasons, we don't want to define CLOCK_TICK_TRATE as
20 * local_cpu_data->itc_rate. Fortunately, we don't have to, either: according to George
21 * Anzinger, 1/CLOCK_TICK_RATE is taken as the resolution of the timer clock. The time
22 * calculation assumes that you will use enough of these so that your tick size <= 1/HZ.
23 * If the calculation shows that your CLOCK_TICK_RATE can not supply exactly 1/HZ ticks,
24 * the actual value is calculated and used to update the wall clock each jiffie. Setting
25 * the CLOCK_TICK_RATE to x*HZ insures that the calculation will find no errors. Hence we
26 * pick a multiple of HZ which gives us a (totally virtual) CLOCK_TICK_RATE of about
27 * 100MHz.
28 */
29 #define CLOCK_TICK_RATE (HZ * 100000UL)
31 static inline cycles_t
32 get_cycles (void)
33 {
34 cycles_t ret;
36 ret = ia64_getreg(_IA64_REG_AR_ITC);
37 return ret;
38 }
40 #endif /* _ASM_IA64_TIMEX_H */