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      1 /*	$NetBSD: cpu_counter.h,v 1.3 2014/02/26 01:54:10 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      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 _ARM_CPU_COUNTER_H_
     33 #define _ARM_CPU_COUNTER_H_
     34 
     35 /*
     36  * ARM specific support for CPU counter (ARM11 and Cortex only).
     37  * If __HAVE_CPU_COUNTER is defined for any other CPU_*, it will crash.
     38  */
     39 
     40 #ifdef _KERNEL
     41 
     42 #include <sys/cpu.h>
     43 
     44 #if defined(CPU_CORTEX) || defined(CPU_ARM11)
     45 #define cpu_hascounter()	(curcpu()->ci_data.cpu_cc_freq != 0)
     46 #else
     47 #define cpu_hascounter()	false
     48 #endif
     49 
     50 #define cpu_counter()		cpu_counter32()
     51 
     52 #if defined(CPU_CORTEX) || defined(CPU_ARM11)
     53 static __inline uint32_t
     54 cpu_counter32(void)
     55 {
     56 #if defined(CPU_CORTEX) && defined(CPU_ARM11)
     57 	const bool cortex_p = CPU_ID_CORTEX_P(curcpu()->ci_arm_cpuid);
     58 #elif defined(CPU_CORTEX)
     59 	const bool cortex_p = true;
     60 #elif defined(CPU_ARM11)
     61 	const bool cortex_p = false;
     62 #endif
     63 
     64 	if (cortex_p)
     65 		return armreg_pmccntr_read();
     66 	else
     67 		return armreg_pmccntrv6_read();
     68 }
     69 #endif
     70 
     71 static __inline uint64_t
     72 cpu_frequency(struct cpu_info *ci)
     73 {
     74 	return ci->ci_data.cpu_cc_freq;
     75 }
     76 
     77 #endif /* _KERNEL */
     78 
     79 #endif /* _ARM_CPU_COUNTER_H_ */
     80