CUSTOM_BIOS_INPUT_RING_ENTRIES
if (CIRC_SPACE(rb->head, rb->tail, CUSTOM_BIOS_INPUT_RING_ENTRIES) == 0) {
rb->tail = (rb->tail + 1) & (CUSTOM_BIOS_INPUT_RING_ENTRIES - 1);
rb->head = (rb->head + 1) & (CUSTOM_BIOS_INPUT_RING_ENTRIES - 1);
struct pmf_bios_input_entry data[CUSTOM_BIOS_INPUT_RING_ENTRIES];
if (CIRC_CNT(rb->head, rb->tail, CUSTOM_BIOS_INPUT_RING_ENTRIES) == 0)
rb->tail = (rb->tail + 1) & (CUSTOM_BIOS_INPUT_RING_ENTRIES - 1);