regress/sys/arch/i386/iopl/iopl.c

   1 /*      $NetBSD: iopl.c,v 1.1 2008/01/04 15:37:11 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 1.1 2008/01/04 15:37:11 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 }