1/*	$NetBSD: cpu_counter.h,v 1.7 2010/02/25 23:31:47 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
46static __inline uint32_t
47cpu_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
85extern uint32_t ticks_per_sec;
86
87static __inline uint64_t
88cpu_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