diff options
| author | Finn Thain <fthain@telegraphics.com.au> | 2020-01-29 20:27:49 +1100 |
|---|---|---|
| committer | Jason Wang <jasowang@redhat.com> | 2020-03-03 18:04:47 +0800 |
| commit | ea2270279bc2e1635cb6e909e22e17e630198773 (patch) | |
| tree | f0c5d377e158f39ce9211a2fc0465b772020a335 /hw/net/dp8393x.c | |
| parent | bae112b80c9c42cea21ee7623c283668c3451c2e (diff) | |
dp8393x: Use long-word-aligned RRA pointers in 32-bit mode
Section 3.4.1 of the datasheet says,
The alignment of the RRA is confined to either word or long word
boundaries, depending upon the data width mode. In 16-bit mode,
the RRA must be aligned to a word boundary (A0 is always zero)
and in 32-bit mode, the RRA is aligned to a long word boundary
(A0 and A1 are always zero).
This constraint has been implemented for 16-bit mode; implement it
for 32-bit mode too.
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'hw/net/dp8393x.c')
| -rw-r--r-- | hw/net/dp8393x.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c index 63293411db..d8bf248bc6 100644 --- a/hw/net/dp8393x.c +++ b/hw/net/dp8393x.c @@ -665,12 +665,16 @@ static void dp8393x_write(void *opaque, hwaddr addr, uint64_t data, qemu_flush_queued_packets(qemu_get_queue(s->nic)); } break; - /* Ignore least significant bit */ + /* The guest is required to store aligned pointers here */ case SONIC_RSA: case SONIC_REA: case SONIC_RRP: case SONIC_RWP: - s->regs[reg] = val & 0xfffe; + if (s->regs[SONIC_DCR] & SONIC_DCR_DW) { + s->regs[reg] = val & 0xfffc; + } else { + s->regs[reg] = val & 0xfffe; + } break; /* Invert written value for some registers */ case SONIC_CRCT: |