diff options
Diffstat (limited to 'sys/dev/ofw/openfirm.c')
| -rw-r--r-- | sys/dev/ofw/openfirm.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/sys/dev/ofw/openfirm.c b/sys/dev/ofw/openfirm.c index d63edcebff9d..0760854079c7 100644 --- a/sys/dev/ofw/openfirm.c +++ b/sys/dev/ofw/openfirm.c @@ -386,6 +386,48 @@ OF_package_to_path(phandle_t package, char *buf, size_t len) return (OFW_PACKAGE_TO_PATH(ofw_obj, package, buf, len)); } +/* Look up effective phandle (see FDT/PAPR spec) */ +static phandle_t +OF_child_xref_phandle(phandle_t parent, phandle_t xref) +{ + phandle_t child, rxref; + + /* + * Recursively descend from parent, looking for a node with a property + * named either "phandle", "ibm,phandle", or "linux,phandle" that + * matches the xref we are looking for. + */ + + for (child = OF_child(parent); child != 0; child = OF_peer(child)) { + rxref = OF_child_xref_phandle(child, xref); + if (rxref != -1) + return (rxref); + + if (OF_getprop(child, "phandle", &rxref, sizeof(rxref)) == -1 && + OF_getprop(child, "ibm,phandle", &rxref, + sizeof(rxref)) == -1 && OF_getprop(child, + "linux,phandle", &rxref, sizeof(rxref)) == -1) + continue; + + if (rxref == xref) + return (child); + } + + return (-1); +} + +phandle_t +OF_xref_phandle(phandle_t xref) +{ + phandle_t node; + + node = OF_child_xref_phandle(OF_peer(0), xref); + if (node == -1) + return (xref); + + return (node); +} + /* Call the method in the scope of a given instance. */ int OF_call_method(const char *method, ihandle_t instance, int nargs, int nreturns, |