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rtl8139: support byte read to TxStatus registers

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Some drivers (such as win7) use byte read for TxStatus registers, so we need to
support this to let guest driver behave correctly.

For writing, only double-word access is allowed by spec.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2012-03-05 11:08:42 +08:00 committed by Michael S. Tsirkin
parent b44ce451df
commit afe0a59535
1 changed files with 29 additions and 4 deletions
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33
hw/rtl8139.c
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@ -2495,11 +2495,30 @@ static void rtl8139_TxStatus_write(RTL8139State *s, uint32_t txRegOffset, uint32
rtl8139_transmit(s);
}
static uint32_t rtl8139_TxStatus_read(RTL8139State *s, uint32_t txRegOffset)
static uint32_t rtl8139_TxStatus_read(RTL8139State *s, uint8_t addr, int size)
{
uint32_t ret = s->TxStatus[txRegOffset/4];
uint32_t reg = (addr - TxStatus0) / 4;
uint32_t offset = addr & 0x3;
uint32_t ret = 0;
DPRINTF("TxStatus read offset=0x%x val=0x%08x\n", txRegOffset, ret);
if (addr & (size - 1)) {
DPRINTF("not implemented read for TxStatus addr=0x%x size=0x%x\n", addr,
size);
return ret;
}
switch (size) {
case 1: /* fall through */
case 2: /* fall through */
case 4:
ret = (s->TxStatus[reg] >> offset * 8) & ((1 << (size * 8)) - 1);
DPRINTF("TxStatus[%d] read addr=0x%x size=0x%x val=0x%08x\n", reg, addr,
size, ret);
break;
default:
DPRINTF("unsupported size 0x%x of TxStatus reading\n", size);
break;
}
return ret;
}
@ -2970,6 +2989,9 @@ static uint32_t rtl8139_io_readb(void *opaque, uint8_t addr)
case MAR0 ... MAR0+7:
ret = s->mult[addr - MAR0];
break;
case TxStatus0 ... TxStatus0+4*4-1:
ret = rtl8139_TxStatus_read(s, addr, 1);
break;
case ChipCmd:
ret = rtl8139_ChipCmd_read(s);
break;
@ -3033,6 +3055,9 @@ static uint32_t rtl8139_io_readw(void *opaque, uint8_t addr)
switch (addr)
{
case TxAddr0 ... TxAddr0+4*4-1:
ret = rtl8139_TxStatus_read(s, addr, 2);
break;
case IntrMask:
ret = rtl8139_IntrMask_read(s);
break;
@ -3123,7 +3148,7 @@ static uint32_t rtl8139_io_readl(void *opaque, uint8_t addr)
break;
case TxStatus0 ... TxStatus0+4*4-1:
ret = rtl8139_TxStatus_read(s, addr-TxStatus0);
ret = rtl8139_TxStatus_read(s, addr, 4);
break;
case TxAddr0 ... TxAddr0+4*4-1: