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e1000: Mask out lower bits of RDBAL/TDBAL

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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>
This commit is contained in:
Kevin Wolf 2011-03-26 19:37:56 +01:00 committed by Aurelien Jarno
parent 425189a8ff
commit d17161f6cc
1 changed files with 18 additions and 3 deletions
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21
hw/e1000.c
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@ -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);