DragonFly kernel List (threaded) for 2006-02
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i386_set_ioperm() problems
Hi,
I'm trying to write a little test utility to mess with VGA registers.
Example:
-------------------------
#include <stdio.h>
#include <stdlib.h>
#include <machine/cpufunc.h>
#include <machine/sysarch.h>
#define SEQIDX 0x03c4
#define SEQREG 0x03c5
int
main(int argc, char *argv[])
{
int i;
i386_set_ioperm(SEQIDX, 1, 1);
i386_set_ioperm(SEQREG, 1, 1);
for (i = 0; i <= 4; i++) {
outb(SEQIDX, i);
printf("%d\n", inb(SEQREG));
}
i386_set_ioperm(SEQIDX, 1, 0);
i386_set_ioperm(SEQREG, 1, 0);
exit(EXIT_SUCCESS);
}
-------------------------
Problem is that the code dumps core in machine/cpufunc.h. On one of my
machines, it will actually print the values every 5 or 6 times I run it.
In all other cases I get the core dump (on my laptop it dumps core
always and never prints anything).
Sascha
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