882bcf5879
very strict and leaves much up to the platform so that it can define a convenient mapping. Requested by: mjacob
76 lines
2.8 KiB
C
76 lines
2.8 KiB
C
/*
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* Copyright (c) 2001 Wind River Systems, Inc.
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* All rights reserved.
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* Written by: John Baldwin <jhb@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This module provides MI support for per-cpu data.
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*
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* Each architecture determines the mapping of logical CPU IDs to physical
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* CPUs. The requirements of this mapping are as follows:
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* - Logical CPU IDs must reside in the range 0 ... MAXCPU - 1.
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* - The mapping is not required to be dense. That is, there may be
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* gaps in the mappings.
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* - The platform sets the value of MAXCPU in <machine/param.h>.
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* - It is suggested, but not required, that in the non-SMP case, the
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* platform define MAXCPU to be 1 and define the logical ID of the
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* sole CPU as 0.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/pcpu.h>
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static struct globaldata *cpuid_to_globaldata[MAXCPU];
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struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead);
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/*
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* Register a struct globaldata.
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*/
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void
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globaldata_register(struct globaldata *globaldata)
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{
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KASSERT(globaldata->gd_cpuid >= 0 && globaldata->gd_cpuid < MAXCPU,
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("globaldata_register: invalid cpuid"));
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cpuid_to_globaldata[globaldata->gd_cpuid] = globaldata;
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SLIST_INSERT_HEAD(&cpuhead, globaldata, gd_allcpu);
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}
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/*
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* Locate a struct globaldata by cpu id.
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*/
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struct globaldata *
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globaldata_find(u_int cpuid)
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{
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return (cpuid_to_globaldata[cpuid]);
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}
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