Ensure that the CUDA buffer is protected from autopoll requests overwriting
its contents whilst existing CUDA requests are in progress.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>
---
hw/misc/macio/cuda.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hw/misc/macio/cuda.c b/hw/misc/macio/cuda.c
index 716866ea34..3e46ab6864 100644
--- a/hw/misc/macio/cuda.c
+++ b/hw/misc/macio/cuda.c
@@ -114,6 +114,7 @@ static void cuda_update(CUDAState *s)
{
MOS6522CUDAState *mcs = &s->mos6522_cuda;
MOS6522State *ms = MOS6522(mcs);
+ ADBBusState *adb_bus = &s->adb_bus;
int packet_received, len;
packet_received = 0;
@@ -124,6 +125,9 @@ static void cuda_update(CUDAState *s)
/* data output */
if ((ms->b & (TACK | TIP)) != (s->last_b & (TACK | TIP))) {
if (s->data_out_index < sizeof(s->data_out)) {
+ if (s->data_out_index == 0) {
+ adb_autopoll_block(adb_bus);
+ }
trace_cuda_data_send(ms->sr);
s->data_out[s->data_out_index++] = ms->sr;
cuda_delay_set_sr_int(s);
@@ -138,6 +142,7 @@ static void cuda_update(CUDAState *s)
/* indicate end of transfer */
if (s->data_in_index >= s->data_in_size) {
ms->b = (ms->b | TREQ);
+ adb_autopoll_unblock(adb_bus);
}
cuda_delay_set_sr_int(s);
}
--
2.20.1
