On Wed, 25 Aug 1999, Benjamin Herrenschmidt wrote:

BootX will load the kernel in the first contiguous region in memory it
can find, but that means that we have to copy the exception vectors to 0,
adjust them so they call correctly the kernel routines in the real base
of the kernel (which will not be 0 on some machines), and we'll have
virt_to_phys and co be non-constant. I read an interesting suggestion
some time ago of reserving a register during kernel compile with gcc and
using this register to store the real base of the kernel. Modules will
not be compatible, but that's not a real issue for now.
I don't know how the APUS code works, but I heard it is similar.

The latest APUS patches use a fixup section and code to adjust KERNELBASE after
boot up.

Greetings,

						Geert

--
Geert Uytterhoeven                     Geert.Uytterhoeven@cs.kuleuven.ac.be
Wavelets, Linux/{m68k~Amiga,PPC~CHRP}  http://www.cs.kuleuven.ac.be/~geert/
Department of Computer Science -- Katholieke Universiteit Leuven -- Belgium


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