V3D_RING_SLOTS
#define V3D_VRAM_MMAP_OFF ((off_t)V3D_RING_SLOTS * V3D_SLOT_SIZE)
bus_dmamap_t sc_v3d_slot_map[V3D_RING_SLOTS];
bus_dma_segment_t sc_v3d_slot_seg[V3D_RING_SLOTS];
uint8_t *sc_v3d_slot[V3D_RING_SLOTS];
for (s = 0; s < V3D_RING_SLOTS; s++) {
if (vs->vs_slot >= V3D_RING_SLOTS ||