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1 /* port.c
2  * General port I/O utility
3  * NetWatch system management mode administration console
4  *
5  * Copyright (c) 2008 Jacob Potter and Joshua Wise.  All rights reserved.
6  * This program is free software; you can redistribute and/or modify it under
7  * the terms found in the file LICENSE in the root of this source tree.
8  *
9  */
10
11 #include <sys/io.h>
12 #include <string.h>
13
14 int main(int argc, char **argv)
15 {
16         unsigned int port;
17         unsigned char type = 'b';
18         unsigned int datum;
19         
20         if (iopl(3) < 0)
21         {
22                 perror("iopl");
23                 return 1;
24         }
25         
26         if ((argc < 2) || (argc > 4))
27         {
28         usage:
29                 printf("usage: %s port [b|w|l [datum]]\n", argv[0]);
30                 return 2;
31         }
32         
33         port = strtoul(argv[1], NULL, 0);
34         
35         if (argc > 2)
36                 type = *argv[2];
37         
38         if (argc > 3)
39         {
40                 datum = strtoul(argv[3], NULL, 0);
41                 switch (type)
42                 {
43                 case 'b':
44                         datum &= 0xFF;
45                         outb(datum, port);
46                         printf("Wrote byte 0x%02x to port 0x%04x\n", datum, port);
47                         break;
48                 case 'w':
49                         datum &= 0xFFFF;
50                         outw(datum, port);
51                         printf("Wrote word 0x%04x to port 0x%04x\n", datum, port);
52                         break;
53                 case 'l':
54                         outb(datum, port);
55                         printf("Wrote long 0x%08x to port 0x%04x\n", datum, port);
56                         break;
57                 default:
58                         goto usage;
59                 }
60         } else {
61                 switch(type)
62                 {
63                 case 'b':
64                         datum = inb(port);
65                         printf("Read byte 0x%02x from port 0x%04x\n", datum, port);
66                         break;
67                 case 'w':
68                         datum = inw(port);
69                         printf("Read word 0x%04x from port 0x%04x\n", datum, port);
70                         break;
71                 case 'l':
72                         datum = inl(port);
73                         printf("Read long 0x%08x from port 0x%04x\n", datum, port);
74                         break;
75                 default:
76                         goto usage;
77                 }
78         }
79 }
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