The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/include/cpuinfo.h

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    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_ */

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