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      1 /* $NetBSD: cpu_counter.h,v 1.7 2020/10/10 03:05:04 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      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 #ifndef _ALPHA_CPU_COUNTER_H_
     33 #define _ALPHA_CPU_COUNTER_H_
     34 
     35 /*
     36  * Machine-specific support for CPU counter.
     37  */
     38 
     39 #ifdef _KERNEL
     40 
     41 #include <machine/cpu.h>
     42 #include <machine/rpb.h>
     43 
     44 #define	cc_get_primary_cc()	\
     45 	alpha_send_ipi(hwrpb->rpb_primary_cpu_id, ALPHA_IPI_PRIMARY_CC)
     46 
     47 /* Process Cycle Counter is always available. */
     48 #define cpu_hascounter()	(1)
     49 #define cpu_counter()		cpu_counter32()
     50 
     51 static __inline uint32_t
     52 cpu_counter32(void)
     53 {
     54 
     55 	/*
     56 	 * Only the lower 32 bits of the PCC are an actual cycle
     57 	 * counter.  Thankfully, the rnd(4) code only wants a
     58 	 * 32-bit value anyway.
     59 	 */
     60 	return (alpha_rpcc() & 0xffffffffU);
     61 }
     62 
     63 static __inline uint64_t
     64 cpu_frequency(struct cpu_info *ci)
     65 {
     66 
     67 	return (ci->ci_pcc_freq);
     68 }
     69 
     70 #endif /* _KERNEL */
     71 
     72 #endif /* !_ALPHA_CPU_COUNTER_H_ */
     73