UVH_RH_GAM_GRU_OVERLAY_CONFIG
if (UVH_RH_GAM_GRU_OVERLAY_CONFIG) {
gru.v = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG);
gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG) &