sm64/lib/src/__osSiRawWriteIo.c

#include "libultra_internal.h"
#include "PR/rcp.h"

s32 __osSiRawWriteIo(u32 devAddr, u32 data) {
    if (__osSiDeviceBusy()) {
        return -1;
    }
    IO_WRITE(devAddr, data);
    return 0;
}