diff options
| author | Hervé Poussineau <hpoussin@reactos.org> | 2012-02-06 22:29:05 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2012-02-29 12:48:46 +0100 |
| commit | 8510854ee7dc04f70b53aea4d2518a0585fe5d09 (patch) | |
| tree | e655636a32c216c3172178d8d85c27a296b12bd7 /hw/fdc.c | |
| parent | a005186c176e0e630dd146cd3b973384d5e62f34 (diff) | |
| download | focaccia-qemu-8510854ee7dc04f70b53aea4d2518a0585fe5d09.tar.gz focaccia-qemu-8510854ee7dc04f70b53aea4d2518a0585fe5d09.zip | |
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>
Diffstat (limited to 'hw/fdc.c')
| -rw-r--r-- | hw/fdc.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/hw/fdc.c b/hw/fdc.c index 9d1f5b37a3..3d4bb116cb 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), |