From 8510854ee7dc04f70b53aea4d2518a0585fe5d09 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Herv=C3=A9=20Poussineau?= Date: Mon, 6 Feb 2012 22:29:05 +0100 Subject: fdc: handle read-only floppies (abort early on write commands) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit A real floppy doesn't attempt to write to read-only media either. Signed-off-by: Hervé Poussineau Signed-off-by: Kevin Wolf --- hw/fdc.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'hw') 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), -- cgit v1.1