64 struct fifo {  struct
68 	int	num;		/* number of characters in the fifo */  argument
69 	int	size;		/* size of the fifo */  argument
74 	struct fifo	rxfifo;
141 	struct fifo *fifo;  in uart_rxfifo_getchar()  local
145 	fifo = &sc->rxfifo;  in uart_rxfifo_getchar()
146 	if (fifo->num > 0) {  in uart_rxfifo_getchar()
149 		c = fifo->buf[fifo->rindex];  in uart_rxfifo_getchar()
150 		fifo->rindex = (fifo->rindex + 1) % fifo->size;  in uart_rxfifo_getchar()
151 		fifo->num--;  in uart_rxfifo_getchar()
172 	struct fifo *fifo;  in rxfifo_putchar()  local
175 	fifo = &sc->rxfifo;  in rxfifo_putchar()
177 	if (fifo->num < fifo->size) {  in rxfifo_putchar()
178 		fifo->buf[fifo->windex] = ch;  in rxfifo_putchar()
179 		fifo->windex = (fifo->windex + 1) % fifo->size;  in rxfifo_putchar()
180 		fifo->num++;  in rxfifo_putchar()
184 				 * Disable mevent callback if the FIFO is full.  in rxfifo_putchar()
239 	struct fifo *fifo;  in uart_rxfifo_reset()  local
243 	fifo = &sc->rxfifo;  in uart_rxfifo_reset()
244 	bzero(fifo, sizeof(struct fifo));  in uart_rxfifo_reset()
245 	fifo->size = size;  in uart_rxfifo_reset()