a448b62ac9
interrupt threads to run with it always >= 1, so that malloc can detect M_WAITOK from "interrupt" context. This is also necessary in order to context switch from sched_ithd() directly. Reviewed By: peter
108 lines
3.5 KiB
C
108 lines
3.5 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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#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;
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struct proc *gd_npxproc;
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struct pcb *gd_curpcb;
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struct proc *gd_idleproc;
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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; /* only used for USER_LDT */
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u_int gd_cpuid;
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u_int gd_cpu_lockid;
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u_int gd_other_cpus;
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u_int gd_astpending;
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SLIST_ENTRY(globaldata) gd_allcpu;
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int gd_witness_spin_check;
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#ifdef KTR_PERCPU
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#ifdef KTR
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volatile int gd_ktr_idx;
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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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#endif
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};
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SLIST_HEAD(cpuhead, globaldata);
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extern struct cpuhead cpuhead;
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#ifdef SMP
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/*
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* This is the upper (0xff800000) address space layout that is per-cpu.
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* It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for
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* each AP. genassym helps export this to the assembler code.
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*/
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struct privatespace {
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/* page 0 - data page */
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struct globaldata globaldata;
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char __filler0[PAGE_SIZE - sizeof(struct globaldata)];
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/* page 1..4 - CPAGE1,CPAGE2,CPAGE3,PPAGE1 */
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char CPAGE1[PAGE_SIZE];
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char CPAGE2[PAGE_SIZE];
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char CPAGE3[PAGE_SIZE];
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char PPAGE1[PAGE_SIZE];
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/* page 5..4+UPAGES - idle stack (UPAGES pages) */
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char idlestack[UPAGES * PAGE_SIZE];
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};
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extern struct privatespace SMP_prvspace[];
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#endif
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#endif /* ! _MACHINE_GLOBALDATA_H_ */
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