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f726a87319
and reloading it in i386_extend_pcb() rather than trying to force a context switch to reload the TSS via the TDF_NEEDRESCHED flag. Optimizations to avoid calling cpu_switch() when the new thread was identical to the old thread defeated the attempt to force a TSS reload. Explicitly loading the new TSS is what we really want to do anyway. PR: i386/84842 Reported by: Alexander Best arundel at h3c dot de MFC after: 1 week Reviewed by: bde (mostly)
54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*-
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* Copyright (c) 1997 Jonathan Lemon
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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 _I386_PCB_EXT_H_
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#define _I386_PCB_EXT_H_
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/*
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* Extension to the 386 process control block
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*/
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#include <machine/tss.h>
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#include <machine/vm86.h>
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#include <machine/segments.h>
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struct pcb_ext {
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struct segment_descriptor ext_tssd; /* tss descriptor */
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struct i386tss ext_tss; /* per-process i386tss */
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caddr_t ext_iomap; /* i/o permission bitmap */
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struct vm86_kernel ext_vm86; /* vm86 area */
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};
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#ifdef _KERNEL
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extern int private_tss;
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int i386_extend_pcb(struct thread *);
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#endif
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#endif /* _I386_PCB_EXT_H_ */
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