cpuinfo.h revision 202031
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: head/sys/mips/include/cpuinfo.h 202031 2010-01-10 19:50:24Z 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 52struct 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_int32_t ic_size; 61 u_int8_t ic_linesize; 62 u_int8_t ic_nways; 63 u_int16_t ic_nsets; 64 u_int32_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 73struct 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) \ 101do { \ 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 111extern 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_ */ 121