268bdb43f9
level implementation stuff out of machine/globaldata.h to avoid exposing UPAGES to lots more places. The end result is that we can double the kernel stack size with 'options UPAGES=4' etc. This is mainly being done for the benefit of a MFC to RELENG_4 at some point. -current doesn't really need this so much since each interrupt runs on its own kstack.
80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
/*-
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* Copyright (c) Peter Wemm <peter@netplex.com.au>
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* All rights reserved.
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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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*
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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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#ifndef _MACHINE_GLOBALDATA_H_
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#define _MACHINE_GLOBALDATA_H_
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#ifdef _KERNEL
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#include <machine/segments.h>
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#include <machine/tss.h>
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/* XXX */
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#ifdef KTR_PERCPU
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#include <sys/ktr.h>
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#endif
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/*
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* This structure maps out the global data that needs to be kept on a
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* per-cpu basis. genassym uses this to generate offsets for the assembler
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* code, which also provides external symbols so that C can get at them as
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* though they were really globals.
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*
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* The SMP parts are setup in pmap.c and locore.s for the BSP, and
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* mp_machdep.c sets up the data for the AP's to "see" when they awake.
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* The reason for doing it via a struct is so that an array of pointers
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* to each CPU's data can be set up for things like "check curproc on all
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* other processors"
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*/
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struct globaldata {
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struct globaldata *gd_prvspace; /* self-reference */
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struct proc *gd_curproc; /* current process */
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struct proc *gd_idleproc; /* idle process */
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struct proc *gd_npxproc;
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struct pcb *gd_curpcb; /* current pcb */
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struct timeval gd_switchtime;
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struct i386tss gd_common_tss;
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int gd_switchticks;
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struct segment_descriptor gd_common_tssd;
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struct segment_descriptor *gd_tss_gdt;
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int gd_currentldt;
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u_int gd_cpuid; /* this cpu number */
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u_int gd_other_cpus; /* all other cpus */
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SLIST_ENTRY(globaldata) gd_allcpu;
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struct lock_list_entry *gd_spinlocks;
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#ifdef KTR_PERCPU
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volatile int gd_ktr_idx; /* Index into trace table */
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char *gd_ktr_buf;
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char gd_ktr_buf_data[KTR_SIZE];
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#endif
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};
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#endif /* _KERNEL */
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#endif /* ! _MACHINE_GLOBALDATA_H_ */
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