109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/* $NetBSD: lkminit_emul.c,v 1.10 2005/12/11 12:24:47 christos Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Michael Graff <explorer@flame.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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lkminit_emul.c,v 1.10 2005/12/11 12:24:47 christos Exp $");
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/proc.h>
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#include <sys/lkm.h>
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extern const struct emul emul_svr4;
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int compat_svr4_lkmentry __P((struct lkm_table *, int, int));
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static int svr4_init __P((struct lkm_table *lkmtp, int cmd));
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static int svr4_done __P((struct lkm_table *lkmtp, int cmd));
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/*
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* declare the emulation
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*/
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MOD_COMPAT("compat_svr4", -1, &emul_svr4);
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/*
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* entry point
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*/
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int
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compat_svr4_lkmentry(lkmtp, cmd, ver)
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struct lkm_table *lkmtp;
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int cmd;
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int ver;
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{
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DISPATCH(lkmtp, cmd, ver, svr4_init, svr4_done, lkm_nofunc);
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}
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static int
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svr4_init(lkmtp, cmd)
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struct lkm_table *lkmtp;
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int cmd;
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{
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#ifdef i386
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/*
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* XXX Yeah, this is ugly.
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* Ideally, there would be some compat init/done routine, called
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* by both this code and i386/machdep.c. However, that seems like
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* overkill given that only svr4 compat needs an initialization.
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*/
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#define IDTVEC(name) __CONCAT(X, name)
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extern void IDTVEC(svr4_fasttrap) __P((void));
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setgate(&idt[0xd2], &IDTVEC(svr4_fasttrap), 0, SDT_SYS386TGT,
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SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
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#endif
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return (0);
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}
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static int
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svr4_done(struct lkm_table *lkmtp, int cmd)
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{
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#ifdef i386
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/* XXX is this right? Wouldn't this cause null pointer dereference
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* if some userland code would use the gate after the LKM is unloaded?
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*/
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setgate(&idt[0xd2], NULL, 0, SDT_SYS386TGT,
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SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
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#endif
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return (0);
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}
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