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NCR 5380-based changes of the day (January 12, 2025)

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1. Sanity check for the SCSI temp_buffer if it's allocated or not.
2. Data reads and writes in non-DMA mode should be accessible only when DMA mode is Idle (as in, no DMA at all, whereas DMA mode will go to the SCSI controllers' callbacks).
This commit is contained in:
TC1995
2025-01-12 20:37:50 +01:00
parent 226537145d
commit 8dc456cce5
3 changed files with 62 additions and 25 deletions
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38
src/scsi/scsi_ncr53c400.c
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@@ -148,6 +148,12 @@ ncr53c400_write(uint32_t addr, uint8_t val, void *priv)
ncr400->busy = 1;
if (!(ncr->mode & MODE_MONITOR_BUSY) && ((scsi_device_get_callback(dev) > 0.0)))
timer_on_auto(&ncr400->timer, ncr->period / 250.0);
else if ((ncr->mode & MODE_MONITOR_BUSY) && !ncr->wait_data) {
if (scsi_device_get_callback(dev) > 0.0)
timer_on_auto(&ncr400->timer, 100.0);
else
timer_on_auto(&ncr400->timer, 40.0);
}
}
}
break;
@@ -181,13 +187,14 @@ ncr53c400_write(uint32_t addr, uint8_t val, void *priv)
if ((ncr->mode & MODE_DMA) && (dev->buffer_length > 0)) {
memset(ncr400->buffer, 0, MIN(128, dev->buffer_length));
if (ncr->mode & MODE_MONITOR_BUSY)
timer_on_auto(&ncr400->timer, ncr->period);
timer_on_auto(&ncr400->timer, (ncr->period / 4.0) * 3.0);
else if (scsi_device_get_callback(dev) > 0.0)
timer_on_auto(&ncr400->timer, 40.0);
else
timer_on_auto(&ncr400->timer, ncr->period);
ncr53c400_log("DMA timer on=%02x, callback=%lf, scsi buflen=%d, waitdata=%d, waitcomplete=%d, clearreq=%d, datawait=%d, enabled=%d.\n", ncr->mode & MODE_MONITOR_BUSY, scsi_device_get_callback(dev), dev->buffer_length, ncr->wait_complete, ncr->wait_data, ncr->wait_complete, ncr->clear_req, ncr->data_wait, timer_is_enabled(&ncr400->timer));
ncr53c400_log("DMA timer on=%02x, callback=%lf, scsi buflen=%d, waitdata=%d, waitcomplete=%d, clearreq=%d, datawait=%d, enabled=%d.\n",
ncr->mode & MODE_MONITOR_BUSY, scsi_device_get_callback(dev), dev->buffer_length, ncr->wait_data, ncr->wait_complete, ncr->clear_req, ncr->data_wait, timer_is_enabled(&ncr400->timer));
}
break;
@@ -244,6 +251,12 @@ ncr53c400_read(uint32_t addr, void *priv)
ncr53c400_log("Transfer busy read, status = %02x.\n", ncr400->status_ctrl);
if (!(ncr->mode & MODE_MONITOR_BUSY) && (scsi_device_get_callback(dev) > 0.0))
timer_on_auto(&ncr400->timer, ncr->period / 250.0);
else if ((ncr->mode & MODE_MONITOR_BUSY) && !ncr->wait_data) {
if (scsi_device_get_callback(dev) > 0.0)
timer_on_auto(&ncr400->timer, 100.0);
else
timer_on_auto(&ncr400->timer, 40.0);
}
}
}
break;
@@ -397,16 +410,20 @@ t130b_in(uint16_t port, void *priv)
}
static void
ncr53c400_dma_mode_ext(void *priv, UNUSED(void *ext_priv))
ncr53c400_dma_mode_ext(void *priv, void *ext_priv)
{
ncr_t *ncr = (ncr_t *) priv;
ncr53c400_t *ncr400 = (ncr53c400_t *) ext_priv;
ncr_t *ncr = (ncr_t *) priv;
/*When a pseudo-DMA transfer has completed (Send or Initiator Receive), mark it as complete and idle the status*/
if (!(ncr->mode & MODE_DMA)) {
ncr53c400_log("No DMA mode\n");
ncr->tcr &= ~TCR_LAST_BYTE_SENT;
ncr->isr &= ~STATUS_END_OF_DMA;
ncr->dma_mode = DMA_IDLE;
ncr53c400_log("BlockCountLoaded=%d.\n", ncr400->block_count_loaded);
if (!ncr400->block_count_loaded) {
if (!(ncr->mode & MODE_DMA)) {
ncr53c400_log("No DMA mode\n");
ncr->tcr &= ~TCR_LAST_BYTE_SENT;
ncr->isr &= ~STATUS_END_OF_DMA;
ncr->dma_mode = DMA_IDLE;
}
}
}
@@ -474,6 +491,7 @@ ncr53c400_callback(void *priv)
ncr400->block_count = (ncr400->block_count - 1) & 0xff;
ncr53c400_log("NCR 53c400 Remaining blocks to be written=%d\n", ncr400->block_count);
if (!ncr400->block_count) {
ncr->dma_mode = DMA_IDLE;
ncr400->block_count_loaded = 0;
ncr53c400_log("IO End of write transfer\n");
ncr->tcr |= TCR_LAST_BYTE_SENT;
@@ -527,6 +545,7 @@ ncr53c400_callback(void *priv)
ncr400->block_count = (ncr400->block_count - 1) & 0xff;
ncr53c400_log("NCR 53c400 Remaining blocks to be read=%d\n", ncr400->block_count);
if (!ncr400->block_count) {
ncr->dma_mode = DMA_IDLE;
ncr400->block_count_loaded = 0;
ncr53c400_log("IO End of read transfer\n");
ncr->isr |= STATUS_END_OF_DMA;
@@ -544,6 +563,7 @@ ncr53c400_callback(void *priv)
break;
}
ncr53c400_log("Bus Read.\n");
ncr5380_bus_read(ncr);
if (!(ncr->cur_bus & BUS_BSY) && (ncr->mode & MODE_MONITOR_BUSY)) {