1/* $OpenBSD: sys_machdep.c,v 1.20 2018/02/19 08:59:52 mpi Exp $ */ 2/* $NetBSD: sys_machdep.c,v 1.1 2003/04/26 18:39:32 fvdl Exp $ */ 3 4/*- 5 * Copyright (c) 1998 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Charles M. Hannum. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/proc.h> 36 37#include <sys/mount.h> 38#include <sys/syscallargs.h> 39 40#include <machine/psl.h> 41#include <machine/sysarch.h> 42 43extern struct vm_map *kernel_map; 44 45int amd64_iopl(struct proc *, void *, register_t *); 46 47#ifdef APERTURE 48extern int allowaperture; 49#endif 50 51int 52amd64_iopl(struct proc *p, void *args, register_t *retval) 53{ 54 int error; 55 struct trapframe *tf = p->p_md.md_regs; 56 struct amd64_iopl_args ua; 57 58 if ((error = suser(p)) != 0) 59 return error; 60 61#ifdef APERTURE 62 if (!allowaperture && securelevel > 0) 63 return EPERM; 64#else 65 if (securelevel > 0) 66 return EPERM; 67#endif 68 69 if ((error = copyin(args, &ua, sizeof(ua))) != 0) 70 return error; 71 72 if (ua.iopl) 73 tf->tf_rflags |= PSL_IOPL; 74 else 75 tf->tf_rflags &= ~PSL_IOPL; 76 77 return 0; 78} 79 80int 81sys_sysarch(struct proc *p, void *v, register_t *retval) 82{ 83 struct sys_sysarch_args /* { 84 syscallarg(int) op; 85 syscallarg(void *) parms; 86 } */ *uap = v; 87 int error = 0; 88 89 switch(SCARG(uap, op)) { 90 case AMD64_IOPL: 91 error = amd64_iopl(p, SCARG(uap, parms), retval); 92 break; 93 94 default: 95 error = EINVAL; 96 break; 97 } 98 return (error); 99} 100