1 /* $NetBSD: cpu_counter.h,v 1.3 2006/02/16 20:17:14 perry Exp $ */ 2 3 /* 4 * Copyright (c) 2000 Soren S. Jorvang. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions, and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef _MIPS_CPU_COUNTER_H_ 29 #define _MIPS_CPU_COUNTER_H_ 30 31 /* 32 * Machine-specific support for CPU counter. 33 */ 34 35 #include <machine/cpu.h> 36 #include <mips/locore.h> 37 38 #ifdef _KERNEL 39 40 #ifdef MIPS3_PLUS 41 static __inline int 42 cpu_hascounter(void) 43 { 44 45 /* 46 * MIPS III and MIPS IV CPU's have a cycle counter 47 * running at half the internal pipeline rate. 48 */ 49 return (MIPS_HAS_CLOCK); 50 } 51 52 #define cpu_counter() cpu_counter32() 53 54 static __inline uint32_t 55 cpu_counter32(void) 56 { 57 58 return mips3_cp0_count_read(); 59 } 60 61 #if 0 /* XXX MI microtime() needs frequency of CPU counter. */ 62 static __inline uint64_t 63 cpu_frequency(struct cpu_info *ci) 64 { 65 } 66 #endif 67 #endif 68 69 #endif /* _KERNEL */ 70 #endif /* !_MIPS_CPU_COUNTER_H_ */ 71