1 /* $NetBSD: cpu.h,v 1.70 2003/01/17 23:36:08 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell and Rick Macklem.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * $FreeBSD: releng/8.1/sys/mips/include/cpuinfo.h 178172 2008-04-13 07:27:37Z imp $
39 * @(#)cpu.h 8.4 (Berkeley) 1/4/94
40 */
41
42 #ifndef _CPUINFO_H_
43 #define _CPUINFO_H_
44
45 /*
46 * Exported definitions unique to NetBSD/mips cpu support.
47 */
48
49 #ifdef _KERNEL
50 #ifndef LOCORE
51
52 struct mips_cpuinfo {
53 u_int8_t cpu_vendor;
54 u_int8_t cpu_rev;
55 u_int8_t cpu_impl;
56 u_int8_t tlb_type;
57 u_int16_t tlb_nentries;
58 u_int8_t icache_virtual;
59 struct {
60 u_int8_t ic_size;
61 u_int8_t ic_linesize;
62 u_int8_t ic_nways;
63 u_int16_t ic_nsets;
64 u_int8_t dc_size;
65 u_int8_t dc_linesize;
66 u_int8_t dc_nways;
67 u_int16_t dc_nsets;
68 } l1;
69 };
70
71 /* TODO: Merge above structure with NetBSD's below. */
72
73 struct cpu_info {
74 #ifdef notyet
75 struct schedstate_percpu ci_schedstate; /* scheduler state */
76 #endif
77 u_long ci_cpu_freq; /* CPU frequency */
78 u_long ci_cycles_per_hz; /* CPU freq / hz */
79 u_long ci_divisor_delay; /* for delay/DELAY */
80 u_long ci_divisor_recip; /* scaled reciprocal of previous;
81 see below */
82 #if defined(DIAGNOSTIC) || defined(LOCKDEBUG)
83 u_long ci_spin_locks; /* # of spin locks held */
84 u_long ci_simple_locks; /* # of simple locks held */
85 #endif
86 };
87
88 /*
89 * To implement a more accurate microtime using the CP0 COUNT register
90 * we need to divide that register by the number of cycles per MHz.
91 * But...
92 *
93 * DIV and DIVU are expensive on MIPS (eg 75 clocks on the R4000). MULT
94 * and MULTU are only 12 clocks on the same CPU.
95 *
96 * The strategy we use is to calculate the reciprical of cycles per MHz,
97 * scaled by 1<<32. Then we can simply issue a MULTU and pluck of the
98 * HI register and have the results of the division.
99 */
100 #define MIPS_SET_CI_RECIPRICAL(cpu) \
101 do { \
102 KASSERT((cpu)->ci_divisor_delay != 0, ("divisor delay")); \
103 (cpu)->ci_divisor_recip = 0x100000000ULL / (cpu)->ci_divisor_delay; \
104 } while (0)
105
106 #define MIPS_COUNT_TO_MHZ(cpu, count, res) \
107 __asm __volatile ("multu %1,%2 ; mfhi %0" \
108 : "=r"((res)) : "r"((count)), "r"((cpu)->ci_divisor_recip))
109
110
111 extern struct cpu_info cpu_info_store;
112
113 #if 0
114 #define curcpu() (&cpu_info_store)
115 #define cpu_number() (0)
116 #endif
117
118 #endif /* !LOCORE */
119 #endif /* _KERNEL */
120 #endif /* _CPUINFO_H_ */
Cache object: 645241a875c17b9fc6113824b81020a7
|