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comparison io/io.c @ 0:c34b37680055 default tip

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Inital commit of random SuperIO code.
author Daniel O'Connor <darius@dons.net.au>
date Thu, 20 Oct 2011 16:48:24 +1030
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-1:000000000000 0:c34b37680055
1 #include <stdio.h>
2 #include <errno.h>
3 #include <string.h>
4 #include <fcntl.h>
5 #include <stdlib.h>
6 #include <sys/types.h>
7 #include <machine/cpufunc.h>
8
9 void
10 usage(char *name) {
11 fprintf(stderr,
12 "Bad usage\n"
13 "\t%s adr [data]\n"
14 "\n"
15 "Read/write adr with data\n", name);
16 exit(1);
17 }
18
19 int
20 main(int argc, char **argv) {
21 int fd, adr, data;
22
23 if (argc != 2 && argc != 3)
24 usage(argv[0]);
25
26 if ((fd = open("/dev/io", O_RDWR)) == -1) {
27 fprintf(stderr, "Can't open /dev/io: %s\n", strerror(errno));
28 exit(1);
29 }
30
31 adr = strtol(argv[1], NULL, 0) & 0xffff;
32
33 if (argc == 3) {
34 data = strtol(argv[2], NULL, 0) & 0xff;
35 printf("0x%02x <- 0x%02x\n", adr, data);
36 outb(adr, data);
37 } else
38 printf("0x%02x -> 0x%02x\n", adr, inb(adr));
39
40 exit(0);
41 }
42