aboutsummaryrefslogtreecommitdiff
path: root/hw/e1000.c
diff options
context:
space:
mode:
authorKevin Wolf <mail@kevin-wolf.de>2011-03-26 19:37:56 +0100
committerAurelien Jarno <aurelien@aurel32.net>2011-04-04 00:15:33 +0200
commitd17161f6cc48a30b5e0c65a7d78ac47b069af06b (patch)
treeaf1f2673c9e092001832d5abde7a6ac48faaa6a8 /hw/e1000.c
parent425189a8ffc1247cc803bf6e1ffea42c47831684 (diff)
downloadqemu-d17161f6cc48a30b5e0c65a7d78ac47b069af06b.zip
qemu-d17161f6cc48a30b5e0c65a7d78ac47b069af06b.tar.gz
qemu-d17161f6cc48a30b5e0c65a7d78ac47b069af06b.tar.bz2
e1000: Mask out lower bits of RDBAL/TDBAL
Rx and Tx descriptors are 16 byte aligned, so the lower bits are ignored by real hardware. In fact, they always read back as zero on real hardware, but probably nobody relies on that. Signed-off-by: Kevin Wolf <mail@kevin-wolf.de> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'hw/e1000.c')
-rw-r--r--hw/e1000.c21
1 files changed, 18 insertions, 3 deletions
diff --git a/hw/e1000.c b/hw/e1000.c
index 55daae0..fe3e812 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -517,6 +517,14 @@ txdesc_writeback(target_phys_addr_t base, struct e1000_tx_desc *dp)
return E1000_ICR_TXDW;
}
+static uint64_t tx_desc_base(E1000State *s)
+{
+ uint64_t bah = s->mac_reg[TDBAH];
+ uint64_t bal = s->mac_reg[TDBAL] & ~0xf;
+
+ return (bah << 32) + bal;
+}
+
static void
start_xmit(E1000State *s)
{
@@ -530,7 +538,7 @@ start_xmit(E1000State *s)
}
while (s->mac_reg[TDH] != s->mac_reg[TDT]) {
- base = ((uint64_t)s->mac_reg[TDBAH] << 32) + s->mac_reg[TDBAL] +
+ base = tx_desc_base(s) +
sizeof(struct e1000_tx_desc) * s->mac_reg[TDH];
cpu_physical_memory_read(base, (void *)&desc, sizeof(desc));
@@ -651,6 +659,14 @@ e1000_can_receive(VLANClientState *nc)
return (s->mac_reg[RCTL] & E1000_RCTL_EN) && e1000_has_rxbufs(s, 1);
}
+static uint64_t rx_desc_base(E1000State *s)
+{
+ uint64_t bah = s->mac_reg[RDBAH];
+ uint64_t bal = s->mac_reg[RDBAL] & ~0xf;
+
+ return (bah << 32) + bal;
+}
+
static ssize_t
e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
{
@@ -700,8 +716,7 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
if (desc_size > s->rxbuf_size) {
desc_size = s->rxbuf_size;
}
- base = ((uint64_t)s->mac_reg[RDBAH] << 32) + s->mac_reg[RDBAL] +
- sizeof(desc) * s->mac_reg[RDH];
+ base = rx_desc_base(s) + sizeof(desc) * s->mac_reg[RDH];
cpu_physical_memory_read(base, (void *)&desc, sizeof(desc));
desc.special = vlan_special;
desc.status |= (vlan_status | E1000_RXD_STAT_DD);