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asm/io.h is the header file containing the central MMIO accessor macros. Judging by the header and the comments, it was apparently once copied from the Linux kernel, but has deviated since then *heavily*. There is absolutely no point in staying close to the original Linux code anymore, so just remove the old cruft, by: - removing pointless Linux history - removing commented code - removing outdated comments - removing unused definitions (for mem_isa) This massively improves the readability of the file. Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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