iommu.txt

默认只有dummy iommu

ACPI_STATUS init(void)
    iommu_manager_init();
        zx_iommu_create(get_root_resource(), ZX_IOMMU_TYPE_DUMMY, &dummy, sizeof(dummy), &iommu_mgr.dummy_iommu);
            sys_iommu_create(zx_handle_t rsrc_handle, uint32_t type,
                             user_in_ptr<const void> desc, size_t desc_len,
                             user_out_handle* out)
                IommuDispatcher::Create(type,
                                         fbl::unique_ptr<const uint8_t[]>(copied_desc.release()),
                                         desc_len, &dispatcher, &rights);
                    这里创建的是dummy iommu                        
                    DummyIommu::Create(fbl::move(desc), desc_len, &iommu);  
                        DummyIommu()