dev/ic/dp8390.c

106 	/* Allocate one xmit buffer if < 16k, two buffers otherwise. */
311 	/* Initialize receive buffer ring. */
348 	 * Set current page pointer to one page after the boundary pointer, as
419 	/* Set TX buffer start page. */
432 	/* Point to next transmit buffer slot and wrap if necessary. */
443  *  1) that the current priority is set to splnet _before_ this code
454 	int buffer;
461 	/* See if there is room to put another packet in the buffer. */
478 	/* txb_new points to next open buffer slot. */
479 	buffer = sc->mem_start +
482 	len = (*sc->write_mbuf)(sc, m0, buffer);
487 	/* Point to next buffer slot and wrap if necessary. */
495 	/* Loop back to the top to possibly buffer more packets. */
510 	uint8_t boundary, current;
514 	/* Set NIC to page 1 registers to get 'current' pointer. */
521 	 * 'sc->next_packet' is the logical beginning of the ring-buffer - i.e.
522 	 * it points to where new data has been buffered.  The 'CURR' (current)
523 	 * register points to the logical end of the ring-buffer - i.e. it
526 	 * words, until the ring-buffer is empty).
528 	current = NIC_GET(regt, regh, ED_P1_CURR);
529 	if (sc->next_packet == current)
539 		/* Get pointer to this buffer's header structure. */
552 		 * NOTE: sc->next_packet is pointing at the current packet.
570 			    sc->rec_page_start, sc->next_packet, current,
605 		 * buffer behind (as recommended by NS databook).
611 	} while (sc->next_packet != current);
725 			 * Decrement buffer in-use count if not zero (can only
750 				    "ring buffer overrun\n",
926  * Retrieve packet from buffer memory and send to the next level up via
1019  * Copy data from receive buffer to a new mbuf chain allocating mbufs
1022  * src = pointer in dp8390 ring buffer
1086  * Zero NIC buffer memory and verify that it is clear.
1099 			printf(": failed to clear NIC buffer at offset %x - "
1128  * Copy `amount' bytes from a packet in the ring buffer to a linear
1129  * destination buffer, given a source offset and destination address.
1139 	/* Does copy wrap to lower addr in ring buffer? */
1156  * Copy a packet from an mbuf to the transmit buffer on the card.
1158  * Currently uses an extra buffer/extra memory copy, unless the whole
1408 	uint8_t bnry, current, isr;
1444 		current = NIC_GET(regt, regh, ED_P1_CURR);
1451 		if (sc->next_packet == current) {