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/* $NetBSD: cpu.h,v 1.70 2003/01/17 23:36:08 thorpej Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell and Rick Macklem.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
* @(#)cpu.h 8.4 (Berkeley) 1/4/94
*/
#ifndef _CPUINFO_H_
#define _CPUINFO_H_
/*
* Exported definitions unique to NetBSD/mips cpu support.
*/
#ifdef _KERNEL
#ifndef LOCORE
struct mips_cpuinfo {
u_int8_t cpu_vendor;
u_int8_t cpu_rev;
u_int8_t cpu_impl;
u_int8_t tlb_type;
u_int16_t tlb_nentries;
u_int8_t icache_virtual;
struct {
u_int8_t ic_size;
u_int8_t ic_linesize;
u_int8_t ic_nways;
u_int16_t ic_nsets;
u_int8_t dc_size;
u_int8_t dc_linesize;
u_int8_t dc_nways;
u_int16_t dc_nsets;
} l1;
};
/* TODO: Merge above structure with NetBSD's below. */
struct cpu_info {
#ifdef notyet
struct schedstate_percpu ci_schedstate; /* scheduler state */
#endif
u_long ci_cpu_freq; /* CPU frequency */
u_long ci_cycles_per_hz; /* CPU freq / hz */
u_long ci_divisor_delay; /* for delay/DELAY */
u_long ci_divisor_recip; /* scaled reciprocal of previous;
see below */
#if defined(DIAGNOSTIC) || defined(LOCKDEBUG)
u_long ci_spin_locks; /* # of spin locks held */
u_long ci_simple_locks; /* # of simple locks held */
#endif
};
/*
* To implement a more accurate microtime using the CP0 COUNT register
* we need to divide that register by the number of cycles per MHz.
* But...
*
* DIV and DIVU are expensive on MIPS (eg 75 clocks on the R4000). MULT
* and MULTU are only 12 clocks on the same CPU.
*
* The strategy we use is to calculate the reciprical of cycles per MHz,
* scaled by 1<<32. Then we can simply issue a MULTU and pluck of the
* HI register and have the results of the division.
*/
#define MIPS_SET_CI_RECIPRICAL(cpu) \
do { \
KASSERT((cpu)->ci_divisor_delay != 0, ("divisor delay")); \
(cpu)->ci_divisor_recip = 0x100000000ULL / (cpu)->ci_divisor_delay; \
} while (0)
#define MIPS_COUNT_TO_MHZ(cpu, count, res) \
__asm __volatile ("multu %1,%2 ; mfhi %0" \
: "=r"((res)) : "r"((count)), "r"((cpu)->ci_divisor_recip))
extern struct cpu_info cpu_info_store;
#if 0
#define curcpu() (&cpu_info_store)
#define cpu_number() (0)
#endif
#endif /* !LOCORE */
#endif /* _KERNEL */
#endif /* _CPUINFO_H_ */
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