NetBSD/sys/lkm/compat/svr4/lkminit_emul.c

109 lines
3.5 KiB
C

/* $NetBSD: lkminit_emul.c,v 1.6 2001/11/12 23:23:05 lukem Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Michael Graff <explorer@flame.org>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lkminit_emul.c,v 1.6 2001/11/12 23:23:05 lukem Exp $");
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/lkm.h>
extern const struct emul emul_svr4;
int compat_svr4_lkmentry __P((struct lkm_table *, int, int));
static int svr4_init __P((struct lkm_table *lkmtp, int cmd));
static int svr4_done __P((struct lkm_table *lkmtp, int cmd));
/*
* declare the emulation
*/
MOD_COMPAT("compat_svr4", -1, &emul_svr4);
/*
* entry point
*/
int
compat_svr4_lkmentry(lkmtp, cmd, ver)
struct lkm_table *lkmtp;
int cmd;
int ver;
{
DISPATCH(lkmtp, cmd, ver, svr4_init, svr4_done, lkm_nofunc);
}
static int
svr4_init(lkmtp, cmd)
struct lkm_table *lkmtp;
int cmd;
{
#ifdef i386
/*
* XXX Yeah, this is ugly.
* Ideally, there would be some compat init/done routine, called
* by both this code and i386/machdep.c. However, that seems like
* overkill given that only svr4 compat needs an initialization.
*/
#define IDTVEC(name) __CONCAT(X, name)
extern void IDTVEC(svr4_fasttrap) __P((void));
setgate(&idt[0xd2].gd, &IDTVEC(svr4_fasttrap), 0, SDT_SYS386TGT,
SEL_UPL);
#endif
return (0);
}
static int
svr4_done(struct lkm_table *lkmtp, int cmd)
{
#ifdef i386
/* XXX is this right? Wouldn't this cause null pointer dereference
* if some userland code would use the gate after the LKM is unloaded?
*/
setgate(&idt[0xd2].gd, NULL, 0, SDT_SYS386TGT,
SEL_UPL);
#endif
return (0);
}