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esp.c: only transfer non-DMA MESSAGE OUT phase data for specific commands

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The contents of the FIFO should only be copied to cmdfifo for ESP commands that
are sending data to the SCSI bus, which are the SEL_* commands and the TI
command. Otherwise any incoming data should be held in the FIFO as normal.

This fixes booting of NetBSD m68k under the Q800 machine once again.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Helge Deller <deller@gmx.de>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20240112125420.514425-78-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2024-01-12 12:54:09 +00:00
parent acdee66d07
commit 215d257964
1 changed files with 15 additions and 6 deletions
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21
hw/scsi/esp.c
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@ -712,14 +712,13 @@ static void esp_do_nodma(ESPState *s)
switch (esp_get_phase(s)) {
case STAT_MO:
/* Copy FIFO into cmdfifo */
n = esp_fifo_pop_buf(&s->fifo, buf, fifo8_num_used(&s->fifo));
n = MIN(fifo8_num_free(&s->cmdfifo), n);
fifo8_push_all(&s->cmdfifo, buf, n);
s->cmdfifo_cdb_offset += n;
switch (s->rregs[ESP_CMD]) {
case CMD_SELATN:
/* Copy FIFO into cmdfifo */
n = esp_fifo_pop_buf(&s->fifo, buf, fifo8_num_used(&s->fifo));
n = MIN(fifo8_num_free(&s->cmdfifo), n);
fifo8_push_all(&s->cmdfifo, buf, n);
if (fifo8_num_used(&s->cmdfifo) >= 1) {
/* First byte received, switch to command phase */
esp_set_phase(s, STAT_CD);
@ -734,6 +733,11 @@ static void esp_do_nodma(ESPState *s)
break;
case CMD_SELATNS:
/* Copy one byte from FIFO into cmdfifo */
n = esp_fifo_pop_buf(&s->fifo, buf, 1);
n = MIN(fifo8_num_free(&s->cmdfifo), n);
fifo8_push_all(&s->cmdfifo, buf, n);
if (fifo8_num_used(&s->cmdfifo) >= 1) {
/* First byte received, stop in message out phase */
s->rregs[ESP_RSEQ] = SEQ_MO;
@ -746,6 +750,11 @@ static void esp_do_nodma(ESPState *s)
break;
case CMD_TI:
/* Copy FIFO into cmdfifo */
n = esp_fifo_pop_buf(&s->fifo, buf, fifo8_num_used(&s->fifo));
n = MIN(fifo8_num_free(&s->cmdfifo), n);
fifo8_push_all(&s->cmdfifo, buf, n);
/* ATN remains asserted until FIFO empty */
s->cmdfifo_cdb_offset = fifo8_num_used(&s->cmdfifo);
esp_set_phase(s, STAT_CD);