1 /* $NetBSD: cpu_counter.h,v 1.8 2011/01/18 01:02:54 matt Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 Tsubai Masanari. 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef _POWERPC_CPU_COUNTER_H_ 30 #define _POWERPC_CPU_COUNTER_H_ 31 32 /* 33 * Machine-specific support for CPU counter. 34 */ 35 36 #ifdef _KERNEL 37 38 #include <powerpc/spr.h> 39 #ifdef PPC_OEA601 40 #include <powerpc/oea/spr.h> 41 #endif 42 43 #define cpu_hascounter() (1) 44 #define cpu_counter() cpu_counter32() 45 46 static __inline uint32_t 47 cpu_counter32(void) 48 { 49 uint32_t rv, rtcu, scratch; 50 51 __asm volatile ( 52 #ifdef PPC_OEA601 53 "mfpvr %0 \n" 54 "srwi %0,%0,16 \n" 55 "cmpwi %0,%3 \n" 56 "bne 1f \n" /* branch if not 601 */ 57 "lis %0,0x77 \n" 58 "ori %0,%0,0x3594 \n" /* 7.8125e6 */ 59 "mfspr %2,%4 \n" 60 "mullw %2,%2,%0 \n" 61 "mfspr %0,%5 \n" 62 "srwi %0,%0,7 \n" 63 "add %1,%2,%0 \n" 64 "b 2f \n" 65 "1: \n" 66 #elif defined(PPC_IBM403) 67 "mftblo %1 \n" 68 #elif defined(PPC_BOOKE) 69 "mfspr %1,%3 \n" 70 #else 71 "mftb %1 \n" 72 #endif 73 "2: \n" 74 : "=r"(scratch), "=r"(rv), "=r"(rtcu) 75 #ifdef PPC_OEA601 76 : "n"(MPC601), "n"(SPR_RTCU_R), "n"(SPR_RTCL_R) 77 #elif defined(PPC_BOOKE) 78 : "n"(SPR_TBL) 79 #endif 80 ); 81 82 return rv; 83 } 84 85 extern uint32_t ticks_per_sec; 86 87 static __inline uint64_t 88 cpu_frequency(struct cpu_info *ci) 89 { 90 /* XXX this probably only works on 603 and newer */ 91 return ticks_per_sec; 92 } 93 94 #endif /* _KERNEL */ 95 96 #endif /* _POWERPC_CPU_COUNTER_H_ */ 97