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95ede670bc
iPXE does not make use of any thread-local storage. Use the otherwise
unused thread pointer register ("tp") to hold the current value of
the virtual address offset, rather than using a global variable.
This ensures that virt_offset can be made valid even during very early
initialisation (when iPXE may be executing directly from read-only
memory and so cannot update a global variable).
Signed-off-by: Michael Brown <mcb30@ipxe.org>