Inportb and reboot:

[Tom]

Hello, when I use this code with ints ENabled, the computer reboots:

__inline__ unsigned inportb(unsigned port)
{
   unsigned ret_val;

   __asm__ __volatile__("inb %w1,%b0"
      : "=a"(ret_val)
      : "d"(port));

   return ret_val;
}

why?

[Tim]

Because it's wrong somehow.

We can't tell why though. That single function looks correct to me.

[Tom]

[attachment deleted by admin]

[Zi]

Hello, when I use this code with ints ENabled, the computer reboots:

__inline__ unsigned inportb(unsigned port)
{
unsigned ret_val;

__asm__ __volatile__("inb %w1,%b0"
: "=a"(ret_val)
: "d"(port));

return ret_val;
}

why?

there are 2 % in registers.
Try like this :

Code: Select all

__inline__ unsigned inportb(unsigned port)
{
   unsigned ret_val;

   __asm__ __volatile__("inb %%w1,%%b0"
      : "=a"(ret_val)
      : "d"(port));

   return ret_val;
}

ans say if it works. You can see my OS at : http://www.boost.ht.st/indexo.php
and download it at : http://boost.zaphebergeur.net/indexo.php?page=dl

[Tom]

why would the %'s have to do anything if it works With Out ints disabled? I think it's just my silly IDT I had...trying a new IDT...

[Pype.Clicker]

i don't know how your code is relocated, but the DW IRQx in your IDT table is likely to trouble most linkers ... maybe you should check your loaded IDT is looking like what you expect ...

[Tom]

I found this one that nu...(forgot the rest of is post name) uses on some OS dev site...testing that...I think it works but I forgot to put code to print a message if the IDT was loaded :-[

Anyway...i'll test it in a bit....