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next-cube.c: move static old_scr2 variable to NeXTPC
Move the old_scr2 variable to NeXTPC so that the old SCR2 register state is stored along with the current SCR2 state. Since the SCR2 register is 32-bits wide, convert old_scr2 to uint32_t and update the SCR2 register access code to allow unaligned writes. Note that this is a migration break, but as nothing will currently boot then we do not need to worry about this now. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Thomas Huth <huth@tuxfamily.org> Message-ID: <20231220131641.592826-9-mark.cave-ayland@ilande.co.uk> Signed-off-by: Thomas Huth <huth@tuxfamily.org>
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