Watchdog for Boser (HS-7001)

[Won De Erick]

>----- Original Message ----

>From: Christoph Mallon <christoph.mallon at gmx.de>
>
>
Won De Erick schrieb:
>>> ----- Original Message ----
>> 
>>> From: Rink Springer <rink at FreeBSD.org>
>>> 
>>> 
>> On Mon, Dec 01, 2008 at 09:38:51AM +0100, Christoph Mallon wrote:
>>>> Userland is not allowed to write to ports. That's the bus error you see. Also without a call to the exit syscall at the end, it will segfault.
>>> Note that you can write to ports from userland by opening /dev/io - if
>>> you have it opened, you can write to the ports.
>>> 
>> 
>> I've added the following at the end
>> 
>>   mov eax, 1 ; SYS_exit
>>   call doint
>> 
>>   doint:
>>      int 0x80
>>      ret
>> 
>> Besides, I can see the following at /dev
>> crw-------   1 root   wheel       0,  16 Nov 27 01:53 io
>> 
>> How should I make this open? do i need to %include this?
>
>You're probably better of writing this in C. Here is a wrapper for the out instruction:
>
>static inline outb(unsigned short port, unsigned char data)
>{
>  asm("outb %0, %1" : : "a" (data), "dN" (port));
>}
>
>As Rink mentioned, you have to open /dev/io. The process must have super-user privileges, see io(4).

will this be ok?

int fd = open("/dev/fido", O_RDWR);


>
>Regards
>    Christoph