grub-0.97/netboot/rtl8139.c

6   This software may be used and distributed according to the terms
9   changes to the original driver:
10   - removed support for interrupts, switching to polling mode (yuck!)
21      Put in virt_to_bus calls to allow Etherboot relocation.
30      Moved the 8K receive buffer to a fixed, available address outside the
32      way to make room for the Etherboot features that need substantial amounts
34      0x10000, so this even conforms to the tagged boot image specification,
48      Rx ring contents by dumping the 2K FIFO contents right where we wanted to
54      Also, pointed all transmit descriptors to the same buffer to
73    Threshold is bytes transferred to chip before transmission starts. */
74 #define TX_FIFO_THRESH 256      /* In bytes, rounded down to 32 byte units. */
86 /* Symbolic offsets to registers. */
113 	 * definitions we will probably never need to know about.  */
319 	/* Give the chip 10ms to finish the reset. */
334 	/* The Linux driver changes Config1 here to use a different LED pattern
340 	 * should have set that to match the card.  */
349 	/* If we add multicast support, the MAR0 register would have to be
350 	 * initialized to 0xffffffffffffffff (two 32 bit accesses).  Etherboot
370 	unsigned int status, to, nstype;
373 	/* nstype assignment moved up here to avoid gcc 3.0.3 compiler bug */
386 	 * bytes are sent automatically for the FCS, totalling to 64 bytes). */
395 	to = currticks() + RTL_TIMEOUT;
404 	} while (currticks() < to);
412 			to-currticks(), status, txstatus);
417 			currticks()-to, status, txstatus);
489 	/* Bit of a guess as to which interrupts we should allow */
501 		/* Apparently writing a 1 to this read-only bit of a
503 		 * force an interrupt.  If you ever want to see how
504 		 * not to write a datasheet, read the one for the