On 12/21/10 8:04 PM, Russell Whitaker wrote:
On Wed, 22 Dec 2010, Stefan Reinauer wrote:
* Fengwei Zhang <[email protected]> [101222 00:31]:
backup_resume copies some memory into a safe place because it will be
overwritten by copying coreboot to memory. After coreboot's device
allocation is done, that memory will be copied back. We do this to
prevent memory corruption through overwriting OS memory with coreboot.
We could get rid of those two copies by setting up a non 1:1
virtual/physical mapping and copy coreboot to the end of physical
memory, running with virtual adressing. However, that would require us
to modify each and every driver that accesses memory mapped devices to
use phys_to_virt()
What if you copied coreboot to the end of physical memory and then told
the OS that physical memory ends just below coreboot?
That would be the plan. However, GCC will not produce code that is
position independent enough to do this without special mappings.
Stefan
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