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cpu_counter.h revision 1.2.18.1 
      1 /*	$NetBSD: cpu_counter.h,v 1.2.18.1 2006/06/21 14:55:03 yamt 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 
     40 #define cpu_hascounter()	(1)
     41 #define cpu_counter()		cpu_counter32()
     42 
     43 static __inline uint32_t
     44 cpu_counter32(void)
     45 {
     46 	uint32_t rv, rtcu, scratch;
     47 
     48 	__asm volatile (
     49 	    "mfpvr	%0		\n"
     50 	    "srwi	%0,%0,16	\n"
     51 	    "cmpwi	%0,%3		\n"
     52 	    "bne	1f		\n"	/* branch if not 601 */
     53 	    "lis	%0,0x77		\n"
     54 	    "ori	%0,%0,0x3594	\n"	/* 7.8125e6 */
     55 	    "mfspr	%2,%4		\n"
     56 	    "mullw	%2,%2,%0	\n"
     57 	    "mfspr	%0,%5		\n"
     58 	    "srwi	%0,%0,7		\n"
     59 	    "add	%1,%2,%0	\n"
     60 	    "b		2f		\n"
     61 	    "1:				\n"
     62 #ifdef PPC_IBM403
     63 	    "mftblo	%1		\n"
     64 #else
     65 	    "mftb	%1		\n"
     66 #endif
     67 	    "2:				\n"
     68 	    : "=r"(scratch), "=r"(rv), "=r"(rtcu)
     69 	    : "n"(MPC601), "n"(SPR_RTCU_R), "n"(SPR_RTCL_R));
     70 
     71 	return rv;
     72 }
     73 
     74 #if 0	/* XXX MI microtime() needs frequency of CPU counter. */
     75 static __inline uint64_t
     76 cpu_frequency(struct cpu_info *ci)
     77 {
     78 }
     79 #endif
     80 #endif /* _KERNEL */
     81 
     82 #endif /* _POWERPC_CPU_COUNTER_H_ */
     83