95c3baa7ee
in a SMP system. Unexpected things could happen if each cpu
has a different ldt setting and one cpu tries to use value
of currentldt set by another cpu.
The fix is to move currentldt to the per-cpu area. It includes
patches I filed in PR i386/6219 which are also user ldt related.
PR: i386/7591, i386/6219
Submitted by: Luoqi Chen <luoqi@watermarkgroup.com>
105 lines
3.4 KiB
C
105 lines
3.4 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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* $Id: globaldata.h,v 1.5 1998/05/28 09:30:02 phk Exp $
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*/
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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 proc *curproc;
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struct proc *npxproc;
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struct pcb *curpcb;
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struct i386tss common_tss;
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struct timeval switchtime;
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#ifdef VM86
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struct segment_descriptor common_tssd;
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u_int private_tss;
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u_int my_tr;
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#endif
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#ifdef USER_LDT
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int currentldt;
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#endif
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#ifdef SMP
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u_int cpuid;
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u_int cpu_lockid;
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u_int other_cpus;
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pd_entry_t *my_idlePTD;
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u_int ss_eflags;
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pt_entry_t *prv_CMAP1;
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pt_entry_t *prv_CMAP2;
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pt_entry_t *prv_CMAP3;
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pt_entry_t *prv_PMAP1;
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int inside_intr;
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#endif
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};
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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 - page table page */
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pt_entry_t prvpt[NPTEPG];
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/* page 2 - local apic mapping */
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lapic_t lapic;
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char __filler1[PAGE_SIZE - sizeof(lapic_t)];
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/* page 3..2+UPAGES - idle stack (UPAGES pages) */
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char idlestack[UPAGES * PAGE_SIZE];
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/* page 3+UPAGES..6+UPAGES - 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 7+UPAGES..15 - spare, unmapped */
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char __filler2[(9-UPAGES) * PAGE_SIZE];
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/* page 16-31 - space for IO apics */
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char ioapics[16 * PAGE_SIZE];
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/* page 32-47 - maybe other cpu's globaldata pages? */
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};
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#endif
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