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Re: ioperm and iopl in gnumach

From: Samuel Thibault
Subject: Re: ioperm and iopl in gnumach
Date: Thu, 20 Aug 2009 02:24:56 +0200
User-agent: Mutt/1.5.12-2006-07-14

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


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