1 /* $NetBSD: iopl.c,v 1.2 2008/01/04 16:18:52 yamt Exp $ */ 2 3 /*- 4 * Copyright (c)2008 YAMAMOTO Takashi, 5 * All rights reserved. 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 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #ifndef lint 31 __RCSID("$NetBSD: iopl.c,v 1.2 2008/01/04 16:18:52 yamt Exp $"); 32 #endif /* not lint */ 33 34 #include <sys/types.h> 35 36 #include <machine/sysarch.h> 37 38 #include <err.h> 39 #include <signal.h> 40 #include <setjmp.h> 41 #include <stdbool.h> 42 #include <stdint.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 /* arbitrary port to test */ 49 #define IO_TIMER1 0x40 50 #define TIMER_CNTR0 0 51 #define PORT (IO_TIMER1+TIMER_CNTR0) 52 53 static uint8_t 54 inb(uint16_t port) 55 { 56 uint8_t data; 57 58 __asm __volatile("inb %1, %0" : "=a"(data) : "id"(port)); 59 return data; 60 } 61 62 sigjmp_buf env; 63 int gotsig; 64 65 static void 66 sighandler(int sig) 67 { 68 69 siglongjmp(env, sig); 70 } 71 72 static void 73 try(const char *msg, bool success) 74 { 75 int sig; 76 77 sig = sigsetjmp(env, 1); 78 if (sig == 0) { 79 inb(PORT); 80 if (!success) { 81 errx(EXIT_FAILURE, "%s: unexpected success of inb", 82 msg); 83 } 84 return; 85 } 86 if (success) { 87 errx(EXIT_FAILURE, "%s: got signal %d\n", msg, sig); 88 } 89 } 90 91 int 92 main(int argc, char *argv[]) 93 { 94 int ret; 95 96 signal(SIGSEGV, sighandler); 97 98 try("1", false); 99 sleep(1); 100 101 ret = i386_iopl(3); 102 if (ret == -1) { 103 err(EXIT_FAILURE, "iopl 1"); 104 } 105 106 sleep(1); 107 try("2", true); 108 sleep(1); 109 110 ret = i386_iopl(0); 111 if (ret == -1) { 112 err(EXIT_FAILURE, "iopl 2"); 113 } 114 115 sleep(1); 116 try("3", false); 117 } 118