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authorHervé Poussineau <hpoussin@reactos.org>2012-02-06 22:29:05 +0100
committerKevin Wolf <kwolf@redhat.com>2012-02-29 12:48:46 +0100
commit8510854ee7dc04f70b53aea4d2518a0585fe5d09 (patch)
treee655636a32c216c3172178d8d85c27a296b12bd7
parenta005186c176e0e630dd146cd3b973384d5e62f34 (diff)
fdc: handle read-only floppies (abort early on write commands)
A real floppy doesn't attempt to write to read-only media either. Signed-off-by: Hervé Poussineau <hpoussin@reactos.org> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
-rw-r--r--hw/fdc.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/hw/fdc.c b/hw/fdc.c
index 9d1f5b3..3d4bb11 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -300,6 +300,7 @@ enum {
};
enum {
+ FD_SR1_NW = 0x02, /* Not writable */
FD_SR1_EC = 0x80, /* End of cylinder */
};
@@ -1179,6 +1180,16 @@ static int fdctrl_transfer_handler (void *opaque, int nchan,
break;
case FD_DIR_WRITE:
/* WRITE commands */
+ if (cur_drv->ro) {
+ /* Handle readonly medium early, no need to do DMA, touch the
+ * LED or attempt any writes. A real floppy doesn't attempt
+ * to write to readonly media either. */
+ fdctrl_stop_transfer(fdctrl,
+ FD_SR0_ABNTERM | FD_SR0_SEEK, FD_SR1_NW,
+ 0x00);
+ goto transfer_error;
+ }
+
DMA_read_memory (nchan, fdctrl->fifo + rel_pos,
fdctrl->data_pos, len);
if (bdrv_write(cur_drv->bs, fd_sector(cur_drv),