1 /* $NetBSD: isqemu.h,v 1.5 2020/08/23 11:00:18 gson Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of The NetBSD Foundation nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 #include <sys/param.h> 35 #include <sys/sysctl.h> 36 #include <sys/drvctlio.h> 37 #include <sys/ioctl.h> 38 #include <fcntl.h> 39 #include <stdbool.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <errno.h> 43 #include <err.h> 44 #include <unistd.h> 45 46 static __inline bool 47 isQEMU(void) { 48 struct devlistargs dla = { 49 .l_devname = "qemufwcfg0", 50 .l_childname = NULL, 51 .l_children = 0, 52 }; 53 int fd = open(DRVCTLDEV, O_RDONLY, 0); 54 if (fd == -1) 55 return false; 56 if (ioctl(fd, DRVLISTDEV, &dla) == -1) { 57 close(fd); 58 return false; 59 } 60 close(fd); 61 return true; 62 } 63 64 static __inline bool 65 isQEMU_TCG(void) { 66 #if defined(__i386__) || defined(__x86_64__) 67 char name[1024]; 68 size_t len = sizeof(name); 69 70 if (sysctlbyname("machdep.cpu_brand", name, &len, NULL, 0) == -1) { 71 if (errno == ENOENT) 72 return false; 73 err(EXIT_FAILURE, "sysctl"); 74 } 75 return strstr(name, "QEMU") != NULL; 76 #else 77 return false; 78 #endif 79 } 80 81 #ifdef TEST 82 int 83 main(void) { 84 return isQEMU(); 85 } 86 #endif 87