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Import the asm-generic MMIO helper functions from the kernel headers into tools/include/. The top-level include is <linux/io.h> which then includes the arch-specific <asm/io.h>, which then includes <asm-generic/io.h>. This layout is chosen to match the kernel header layout and to appease checkpatch.pl (which warns against including <asm/io.h> or <asm-generic/io.h> directly). Changes made when importing: - Add missing includes at the top. - Stub out mmiowb_set_pending(). - Stub out _THIS_IP_. - Stub out log_*_mmio() calls. - Drop the CONFIG_64BIT checks, since tools/include/linux/types.h always defines u64. Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20250822212518.4156428-16-dmatlack@google.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>