From 372254c6e5c078fb13b236bb648d2b9b2b0c70f1 Mon Sep 17 00:00:00 2001 From: "Gabriel L. Somlo" Date: Wed, 31 Oct 2012 14:15:39 -0400 Subject: [PATCH] e1000: pre-initialize RAH/RAL registers Some guest operating systems' drivers (Mac OS X in particular) fail to properly initialize the Receive Address registers (probably expecting them to be pre-initialized by an earlier component, such as a specific proprietary BIOS). This patch pre-initializes the RA registers, allowing OS X networking to function properly. Other guest operating systems are not affected, and free to (re)initialize these registers during boot. [According to the datasheet the Address Valid bits in the RA registers are cleared on PCI or software reset. This patch adds the NIC's MAC address and sets Address Valid on reset. So we diverge from real hardware behavior here. -- Stefan] Signed-off-by: Gabriel Somlo Signed-off-by: Stefan Hajnoczi --- hw/e1000.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/hw/e1000.c b/hw/e1000.c index ec32f591af..cb7e7e8366 100644 --- a/hw/e1000.c +++ b/hw/e1000.c @@ -265,6 +265,8 @@ rxbufsize(uint32_t v) static void e1000_reset(void *opaque) { E1000State *d = opaque; + uint8_t *macaddr = d->conf.macaddr.a; + int i; qemu_del_timer(d->autoneg_timer); memset(d->phy_reg, 0, sizeof d->phy_reg); @@ -277,6 +279,14 @@ static void e1000_reset(void *opaque) if (d->nic->nc.link_down) { e1000_link_down(d); } + + /* Some guests expect pre-initialized RAH/RAL (AddrValid flag + MACaddr) */ + d->mac_reg[RA] = 0; + d->mac_reg[RA + 1] = E1000_RAH_AV; + for (i = 0; i < 4; i++) { + d->mac_reg[RA] |= macaddr[i] << (8 * i); + d->mac_reg[RA + 1] |= (i < 2) ? macaddr[i + 4] << (8 * i) : 0; + } } static void