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At present these functions are stubbed out. For more comprehensive testing with PCI devices it is useful to be able to fully emulate I/O access. Add simple implementations for these. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com> [bmeng: change to use 'const void *' in sandbox_write(); cast 'addr' in read/write macros in arch/sandbox/include/asm/io.h; remove the unnecessary cast in readq/writeq in nvme.h] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>