1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _ASM_IA64_TIMEX_H 3*4882a593Smuzhiyun #define _ASM_IA64_TIMEX_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun /* 6*4882a593Smuzhiyun * Copyright (C) 1998-2001, 2003 Hewlett-Packard Co 7*4882a593Smuzhiyun * David Mosberger-Tang <davidm@hpl.hp.com> 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun /* 10*4882a593Smuzhiyun * 2001/01/18 davidm Removed CLOCK_TICK_RATE. It makes no sense on IA-64. 11*4882a593Smuzhiyun * Also removed cacheflush_time as it's entirely unused. 12*4882a593Smuzhiyun */ 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun #include <asm/intrinsics.h> 15*4882a593Smuzhiyun #include <asm/processor.h> 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun typedef unsigned long cycles_t; 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun extern void (*ia64_udelay)(unsigned long usecs); 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun /* 22*4882a593Smuzhiyun * For performance reasons, we don't want to define CLOCK_TICK_TRATE as 23*4882a593Smuzhiyun * local_cpu_data->itc_rate. Fortunately, we don't have to, either: according to George 24*4882a593Smuzhiyun * Anzinger, 1/CLOCK_TICK_RATE is taken as the resolution of the timer clock. The time 25*4882a593Smuzhiyun * calculation assumes that you will use enough of these so that your tick size <= 1/HZ. 26*4882a593Smuzhiyun * If the calculation shows that your CLOCK_TICK_RATE can not supply exactly 1/HZ ticks, 27*4882a593Smuzhiyun * the actual value is calculated and used to update the wall clock each jiffie. Setting 28*4882a593Smuzhiyun * the CLOCK_TICK_RATE to x*HZ insures that the calculation will find no errors. Hence we 29*4882a593Smuzhiyun * pick a multiple of HZ which gives us a (totally virtual) CLOCK_TICK_RATE of about 30*4882a593Smuzhiyun * 100MHz. 31*4882a593Smuzhiyun */ 32*4882a593Smuzhiyun #define CLOCK_TICK_RATE (HZ * 100000UL) 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun static inline cycles_t get_cycles(void)35*4882a593Smuzhiyunget_cycles (void) 36*4882a593Smuzhiyun { 37*4882a593Smuzhiyun cycles_t ret; 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun ret = ia64_getreg(_IA64_REG_AR_ITC); 40*4882a593Smuzhiyun return ret; 41*4882a593Smuzhiyun } 42*4882a593Smuzhiyun #define get_cycles get_cycles 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun extern void ia64_cpu_local_tick (void); 45*4882a593Smuzhiyun extern unsigned long long ia64_native_sched_clock (void); 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun #endif /* _ASM_IA64_TIMEX_H */ 48