diff options
| author | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | 2023-08-07 07:53:00 +0100 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2023-08-24 10:40:09 +0200 |
| commit | 7a4003be25eae462f3c3d8aad96b57e34dc0c2b8 (patch) | |
| tree | 7a1583095fb5d04c3b7159b887f4af9c3391fe8b | |
| parent | cf4b829f0c09153c504858d2f8426912907124d8 (diff) | |
| download | seabios-7a4003be25eae462f3c3d8aad96b57e34dc0c2b8.tar.gz | |
esp-scsi: handle non-DMA SCSI commands with no data phase
The existing esp-scsi state machine checks for the STAT_TC bit to exit state 1
but in the case where there is no data phase, a non-DMA command is executed
which doesn't set STAT_TC. This only works because QEMU currently always sets
STAT_TC just after issuing every SCSI command.
Update the esp-scsi state machine so that in the case where there is no data
phase, we immediately execute CMD_ICCS instead of waiting for STAT_TC to be
set which will never happen with a non-DMA CMD_SELATN command.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-ID: <20230807065300.366070-4-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
| -rw-r--r-- | src/hw/esp-scsi.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/src/hw/esp-scsi.c b/src/hw/esp-scsi.c index ebdbd028..f19804f4 100644 --- a/src/hw/esp-scsi.c +++ b/src/hw/esp-scsi.c @@ -137,6 +137,9 @@ esp_scsi_process_op(struct disk_op_s *op) esp_scsi_dma(iobase, (u32)op->buf_fl, count, scsi_is_read(op)); outb(ESP_CMD_TI | ESP_CMD_DMA, iobase + ESP_CMD); continue; + } else { + /* No data phase. */ + state++; } } } @@ -144,12 +147,18 @@ esp_scsi_process_op(struct disk_op_s *op) /* At end of DMA TC is set again -> complete command. */ if (state == 1 && (stat & ESP_STAT_TC)) { state++; + continue; + } + + /* Request message in data. */ + if (state == 2) { + state++; outb(ESP_CMD_ICCS, iobase + ESP_CMD); continue; } /* Finally read data from the message in phase. */ - if (state == 2 && (stat & ESP_STAT_MSG)) { + if (state == 3 && (stat & ESP_STAT_MSG)) { state++; status = inb(iobase + ESP_FIFO); inb(iobase + ESP_FIFO); |