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fdc: handle read-only floppies (abort early on write commands)

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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>
This commit is contained in:
Hervé Poussineau 2012-02-06 22:29:05 +01:00 committed by Kevin Wolf
parent a005186c17
commit 8510854ee7
1 changed files with 11 additions and 0 deletions
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11
hw/fdc.c
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@ -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),