kernel - Clear the quick-return flag when changing PSL_IOPL.
[dragonfly.git] / sys / platform / pc64 / x86_64 / sysarch.c
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1/*
2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
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33 */
34#include <sys/types.h>
35#include <sys/kernel.h>
8467576a 36#include <sys/param.h>
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37#include <sys/systm.h>
38#include <sys/sysproto.h>
39#include <sys/memrange.h>
40#include <sys/errno.h>
c33160e8 41#include <sys/proc.h>
d7f50089 42
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43#include <machine/cpu.h>
44
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45int
46sys_sysarch(struct sysarch_args *uap)
47{
48 return (EOPNOTSUPP);
49}
50
51int
52cpu_set_iopl(void)
53{
c33160e8 54 curthread->td_lwp->lwp_md.md_regs->tf_rflags |= PSL_IOPL;
8467576a 55 clear_quickret();
c33160e8 56 return(0);
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57}
58
59int
60cpu_clr_iopl(void)
61{
c33160e8 62 curthread->td_lwp->lwp_md.md_regs->tf_rflags &= ~PSL_IOPL;
8467576a 63 clear_quickret();
c33160e8 64 return(0);
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65}
66