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cpu_counter.h revision 1.6.30.1 
      1 /*	$NetBSD: cpu_counter.h,v 1.6.30.1 2010/04/30 14:39:43 uebayasi 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 #endif /* PPC_OEA601 */
     67 #ifdef PPC_IBM403
     68 	    "mftblo	%1		\n"
     69 #else
     70 	    "mftb	%1		\n"
     71 #endif
     72 	    "2:				\n"
     73 		: "=r"(scratch), "=r"(rv), "=r"(rtcu)
     74 #ifdef PPC_OEA601
     75 		: "n"(MPC601), "n"(SPR_RTCU_R), "n"(SPR_RTCL_R)
     76 #endif
     77 	    );
     78 
     79 	return rv;
     80 }
     81 
     82 extern uint32_t ticks_per_sec;
     83 
     84 static __inline uint64_t
     85 cpu_frequency(struct cpu_info *ci)
     86 {
     87 	/* XXX this probably only works on 603 and newer */
     88 	return ticks_per_sec;
     89 }
     90 
     91 #endif /* _KERNEL */
     92 
     93 #endif /* _POWERPC_CPU_COUNTER_H_ */
     94