On Gwe, 2005-11-18 at 22:23 +0100, Arjan van de Ven wrote:

1) accessing non-ram memory (eg PCI mmio space) by X and the likes
   (ideally should use sysfs but hey, changing X for this will take 
   forever)

Once sysfs supports the relevant capabilities fixing X actually doesn't
look too horrible, the PCI mapping routines are abstracted and done by
PCITAG (ie PCI device). You would need the ISA hole too in some cases.

2) accessing bios memory in the lower 1Gb for various emulation like
   purposes (including vbetool and X mode setting)
3) accessing things the kernel sees as RAM

they are very distinct security wise.

Agreed.