Fix up the RealTek 8139 driver to work on FreeBSD/alpha. This involves a

few changes:

- there was a bug in rl_list_tx_init(): it was calculating the registers
  to initialize incorrectly. Not a problem on the x86 where unaligned
  access are allowed, but a problem on the alpha.

- set rl_btag accordingly depending on the machine type

- rl_rxeof() needs to be sure to longword-align the packet data. This
  is a little tricky since we copy the data out of the receive buffer
  using m_devget(), however there's no way to tell m_devget() to fill
  in the mbufs starting at a particular offset. To get around this,
  we tell m_devget to copy bytes+2 bytes starting at offset offset-2. This
  results in the proper alignment, and we can trim off the two leading
  bytes afterwards with m_adj(). We also allocate some extra space before
  the start of the receive buffer so that we don't get into trouble in
  the case where offset == 0.

- redefine vtophys() in if_rlreg.h for the alpha.

Making this chipset work on the alpha is sort of the inverse of putting
a jet engine on a rowboat (putting a propeller on a 747?) but when
you can get these things for $5 a pop, it's hard to stop people from
buying them.

1 files changed, 9 insertions, 1 deletions

diff --git a/sys/pci/if_rlreg.h b/sys/pci/if_rlreg.h
index ab0f302..53891cf 100644
--- a/sys/pci/if_rlreg.h
+++ b/sys/pci/if_rlreg.h
@@ -29,7 +29,7 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: if_rlreg.h,v 1.18 1999/05/30 18:48:01 wpaul Exp $
+ *	$Id: if_rlreg.h,v 1.19 1999/06/19 20:01:32 wpaul Exp wpaul $
  */
 
 /*
@@ -307,9 +307,12 @@
 #define RL_RXCFG_CONFIG (RL_RX_FIFOTHRESH|RL_RX_MAXDMA|RL_RX_BUF_SZ)
 #define RL_TXCFG_CONFIG	(RL_TXCFG_IFG|RL_TX_MAXDMA)
 
+#define RL_ETHER_ALIGN	2
+
 struct rl_chain_data {
 	u_int16_t		cur_rx;
 	caddr_t			rl_rx_buf;
+	caddr_t			rl_rx_buf_ptr;
 
 	struct mbuf		*rl_tx_chain[RL_TX_LIST_CNT];
 	u_int8_t		last_tx;
@@ -608,3 +611,8 @@ struct rl_softc {
 #define PHY_BMSR_LINKSTAT		0x0004
 #define PHY_BMSR_JABBER			0x0002
 #define PHY_BMSR_EXTENDED		0x0001
+#ifdef __alpha__
+#undef vtophys
+#define vtophys(va)     alpha_XXX_dmamap((vm_offset_t)va)
+#endif
+