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      1 /*	$NetBSD: clock.c,v 1.7 2020/05/29 12:30:40 rin Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  *
      8  * Author:
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /* Comments about functions from alpha/clock.c */
     33 
     34 #include <sys/cdefs.h>
     35 
     36 #include <sys/param.h>
     37 #include <sys/kernel.h>
     38 #include <sys/systm.h>
     39 #include <sys/timetc.h>
     40 
     41 #include <machine/clock.h>
     42 #include <machine/cpu.h>
     43 #include <machine/ia64_cpu.h>
     44 
     45 
     46 uint64_t ia64_clock_reload;
     47 
     48 
     49 #if !defined(MULTIPROCESSOR)
     50 static unsigned
     51 ia64_get_timecount(struct timecounter* tc)
     52 {
     53 
     54 	return ia64_get_itc();
     55 }
     56 #endif
     57 
     58 void
     59 pcpu_initclock(void)
     60 {
     61 	struct cpu_info *ci = curcpu();
     62 
     63 	ci->ci_clockadj = 0;
     64 	ci->ci_clock = ia64_get_itc();
     65 	ia64_set_itm(ci->ci_clock + ia64_clock_reload);
     66 #if 0
     67 	ia64_set_itv(CLOCK_VECTOR);	/* highest priority class */
     68 #endif
     69 	ia64_srlz_d();
     70 }
     71 
     72 /*
     73  * Start the real-time and statistics clocks. We use cr.itc and cr.itm
     74  * to implement a 1000hz clock.
     75  */
     76 void
     77 cpu_initclocks(void)
     78 {
     79 #if !defined(MULTIPROCESSOR)
     80 	static struct timecounter tc =  {
     81 		.tc_get_timecount = ia64_get_timecount,
     82 		.tc_counter_mask = ~0u,
     83 		.tc_name = "ia64_timecounter",
     84 		.tc_quality = 100,
     85 	};
     86 #endif
     87 
     88 	if (itc_frequency == 0)
     89 		panic("Unknown clock frequency");
     90 
     91 	stathz = hz;
     92 	ia64_clock_reload = (itc_frequency + hz / 2) / hz;
     93 
     94 #if !defined(MULTIPROCESSOR)
     95 	tc.tc_frequency = itc_frequency;
     96 	tc_init(&tc);
     97 #endif
     98 
     99 	pcpu_initclock();
    100 }
    101 
    102 void
    103 setstatclockrate(int newhz)
    104 {
    105 
    106 	/* nothing to do? */
    107 }
    108