AML_WALK_PRE
aml_walknodes(sc->sc_root, AML_WALK_PRE, acpi_getpci, sc);
aml_walknodes(sc->sc_root, AML_WALK_PRE, acpi_add_device, sc);
aml_walknodes(sc->sc_root, AML_WALK_PRE, acpi_foundide, sc);
if (mode == AML_WALK_PRE)
aml_walknodes(&aml_root, AML_WALK_PRE, aml_fixup_node, NULL);
aml_walknodes(sc->sc_node, AML_WALK_PRE, sdhc_acpi_do_explore, sc);
aml_walknodes(node, AML_WALK_PRE, pcamux_attach_acpi_mux, sc);