| #ifndef _ASM_IA64_TIMEX_H |
| #define _ASM_IA64_TIMEX_H |
| |
| /* |
| * Copyright (C) 1998-2001, 2003 Hewlett-Packard Co |
| * David Mosberger-Tang <davidm@hpl.hp.com> |
| */ |
| /* |
| * 2001/01/18 davidm Removed CLOCK_TICK_RATE. It makes no sense on IA-64. |
| * Also removed cacheflush_time as it's entirely unused. |
| */ |
| |
| #include <asm/intrinsics.h> |
| #include <asm/processor.h> |
| |
| typedef unsigned long cycles_t; |
| |
| /* |
| * For performance reasons, we don't want to define CLOCK_TICK_TRATE as |
| * local_cpu_data->itc_rate. Fortunately, we don't have to, either: according to George |
| * Anzinger, 1/CLOCK_TICK_RATE is taken as the resolution of the timer clock. The time |
| * calculation assumes that you will use enough of these so that your tick size <= 1/HZ. |
| * If the calculation shows that your CLOCK_TICK_RATE can not supply exactly 1/HZ ticks, |
| * the actual value is calculated and used to update the wall clock each jiffie. Setting |
| * the CLOCK_TICK_RATE to x*HZ insures that the calculation will find no errors. Hence we |
| * pick a multiple of HZ which gives us a (totally virtual) CLOCK_TICK_RATE of about |
| * 100MHz. |
| */ |
| #define CLOCK_TICK_RATE (HZ * 100000UL) |
| |
| static inline cycles_t |
| get_cycles (void) |
| { |
| cycles_t ret; |
| |
| ret = ia64_getreg(_IA64_REG_AR_ITC); |
| return ret; |
| } |
| |
| #endif /* _ASM_IA64_TIMEX_H */ |
