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>
Move the <gdbmach.h> file to <bits/gdbmach.h>, and provide a common
dummy implementation for all architectures that have not yet
implemented support for GDB.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Simplify the process of adding a new CPU architecture by providing
common implementations of typically empty architecture-specific header
files.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
