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+.. _OPAL_NMMU_SET_PTCR:
+
+OPAL_NMMU_SET_PTCR
+------------------
+
+.. code-block:: c
+
+   #define OPAL_NMMU_SET_PTCR			127
+
+   int64 opal_nmmu_set_ptcr(uint64 chip_id, uint64_t ptcr);
+
+
+``uint64 chip_id``
+    either the chip id containing the nest mmu who's ptcr should be set
+    or alternatively -1ULL to indicate all nest mmu ptcr's should be set to
+    the same value.
+``uint64 ptcr``
+    ptcr value pointing to either the radix tables or hash tables.
+
+This OPAL call sets up the Nest MMU by pointing it at the radix page
+table base or the hash page table base (HTABORG).
+
+Return Values
+^^^^^^^^^^^^^
+
+:ref:`OPAL_SUCCESS`
+   the PTCR was updated successful
+:ref:`OPAL_PARAMETER`
+   a parameter was incorrect