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
cpu_counter32(void)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
cpu_frequency(struct cpu_info * ci)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