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cuda: add adb_autopoll_block() and adb_autopoll_unblock() functions 

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-ayland@ilande.co.uk>
Tested-by: Finn Thain <fthain@telegraphics.com.au>
Acked-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200623204936.24064-17-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2020-06-23 21:49:30 +01:00
parent 4e5df0369f
commit 45c9d721ef
1 changed files with 5 additions and 0 deletions
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5
hw/misc/macio/cuda.c
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@ -116,6 +116,7 @@ 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;
@ -126,6 +127,9 @@ 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);
@ -140,6 +144,7 @@ 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);
}