The RISC-V IO Mapping Table (RIMT) provides information about the RISC-V IOMMU [1] and the relationship between the IO topology and the IOMMU in ACPI [2] based RISC-V platforms. The RIMT identifies which components are behind IOMMU and how they are connected together. RISC-V IOMMU can be implemented as either a PCIe device or a platform device.