Re: ioperm and iopl in gnumach

[Samuel Thibault]

Da Zheng, le Tue 04 Aug 2009 16:15:10 +0800, a écrit :
> The driver reads the keyboard status from the port 0x64, and it seems OK. It 
> doesn't work when the driver tries to write the command to the port 0x64. The 
> whole process dies. (the port 0x64 is used for both read the status and 
> writing the command.)
> I have used ioperm to acquire the access to the port 0x64 before accessing 
> the port (K_STATUS is 0x64).
>   if (ioperm (K_STATUS, 1, 1) < 0)
>     return FALSE;
> I use the root user to run the keyboard driver. I don't know what the 
> possible reason is:-(

I don't either, as that's roughly what the console driver does for e.g.
the speaker, and it works for it. Just to make sure: you are using
outb(value, 0x64) ? (not something else than outb, not another argument
order).

Samuel