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      1 /*	$NetBSD: cpu_counter.h,v 1.9 2020/07/06 10:31:23 rin 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 #ifdef _KERNEL_OPT
     39 #include "opt_ppcarch.h"
     40 #endif
     41 
     42 #include <powerpc/spr.h>
     43 #ifdef PPC_OEA601
     44 #include <powerpc/oea/spr.h>
     45 #endif
     46 
     47 #define cpu_hascounter()	(1)
     48 #define cpu_counter()		cpu_counter32()
     49 
     50 static __inline uint32_t
     51 cpu_counter32(void)
     52 {
     53 	uint32_t rv, rtcu, scratch;
     54 
     55 	__asm volatile (
     56 #ifdef PPC_OEA601
     57 	    "mfpvr	%0		\n"
     58 	    "srwi	%0,%0,16	\n"
     59 	    "cmpwi	%0,%3		\n"
     60 	    "bne	1f		\n"	/* branch if not 601 */
     61 	    "lis	%0,0x77		\n"
     62 	    "ori	%0,%0,0x3594	\n"	/* 7.8125e6 */
     63 	    "mfspr	%2,%4		\n"
     64 	    "mullw	%2,%2,%0	\n"
     65 	    "mfspr	%0,%5		\n"
     66 	    "srwi	%0,%0,7		\n"
     67 	    "add	%1,%2,%0	\n"
     68 	    "b		2f		\n"
     69 	    "1:				\n"
     70 #elif defined(PPC_IBM403)
     71 	    "mftblo	%1		\n"
     72 #elif defined(PPC_BOOKE)
     73 	    "mfspr	%1,%3		\n"
     74 #else
     75 	    "mftb	%1		\n"
     76 #endif
     77 	    "2:				\n"
     78 		: "=r"(scratch), "=r"(rv), "=r"(rtcu)
     79 #ifdef PPC_OEA601
     80 		: "n"(MPC601), "n"(SPR_RTCU_R), "n"(SPR_RTCL_R)
     81 #elif defined(PPC_BOOKE)
     82 		: "n"(SPR_TBL)
     83 #endif
     84 	    );
     85 
     86 	return rv;
     87 }
     88 
     89 extern uint32_t ticks_per_sec;
     90 
     91 static __inline uint64_t
     92 cpu_frequency(struct cpu_info *ci)
     93 {
     94 	/* XXX this probably only works on 603 and newer */
     95 	return ticks_per_sec;
     96 }
     97 
     98 #endif /* _KERNEL */
     99 
    100 #endif /* _POWERPC_CPU_COUNTER_H_ */
    101