Re: kernel start addr

[Thomas Petazzoni <thomas.petazzoni@xxxxxxxx>]

Hi,

Le Tue, 20 Mar 2007 03:43:32 +0100,
ninjaboy <n0b0dyn1nj4@xxxxxxxxx> a écrit :

> I've a little doubt, kernel VA on x86 starts at 0xc0000000 to
> 0xffffffff and user VA from 0x0 to 0xbfffffff, on x86_64 i just see:
> 
> #define __PHYSICAL_START        ((unsigned long)CONFIG_PHYSICAL_START)
> #define __START_KERNEL          (__START_KERNEL_map +
> __PHYSICAL_START) where __PHYSICAL_START is 0x200000.
> 
> kernel VA doesn't start at 0xffff800000000000 to 0xffffffffffffffff
> and user VA from 0x0 to 0x0000bfffffffffff ?

I think you're making a confusion between physical and virtual
addresses. __PHYSICAL_START is a physical address, as its name
suggests, while "kernel VA" is a virtual address, as its name suggests.

Thomas
-- 
Thomas Petazzoni - thomas.petazzoni@xxxxxxxx
http://{thomas,sos,kos}.enix.org - http://www.toulibre.org
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