diff options
author | Kevin Wolf <mail@kevin-wolf.de> | 2011-03-26 19:37:56 +0100 |
---|---|---|
committer | Aurelien Jarno <aurelien@aurel32.net> | 2011-04-04 00:15:33 +0200 |
commit | d17161f6cc48a30b5e0c65a7d78ac47b069af06b (patch) | |
tree | af1f2673c9e092001832d5abde7a6ac48faaa6a8 /hw/e1000.c | |
parent | 425189a8ffc1247cc803bf6e1ffea42c47831684 (diff) | |
download | qemu-d17161f6cc48a30b5e0c65a7d78ac47b069af06b.tar.gz |
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.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/hw/e1000.c b/hw/e1000.c index 55daae0eba..fe3e812610 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); |