[Qemu-devel] [RFC 03/10] fdc: respect default drive type

[John Snow <jsnow@redhat.com>]

Respect the default drive type as proffered via the CLI.

This patch overloads the "drive out" parameter of pick_geometry
to be used as a "default hint" which is offered by fd_revalidate.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 hw/block/fdc.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/hw/block/fdc.c b/hw/block/fdc.c
index 1023a01..87fd770 100644
--- a/hw/block/fdc.c
+++ b/hw/block/fdc.c
@@ -128,7 +128,13 @@ static void pick_geometry(BlockBackend *blk, int *nb_heads,
     /* Pick a default drive type if there's no media inserted AND we have
      * not yet announced our drive type to the CMOS. */
     if (!blk_is_inserted(blk) && drive_in == FDRIVE_DRV_NONE) {
-        parse = &fd_formats[0];
+        for (i = 0; ; i++) {
+            parse = &fd_formats[i];
+            if ((parse->drive == FDRIVE_DRV_NONE) ||
+                (parse->drive == *drive)) {
+                break;
+            }
+        }
         goto out;
     }
 
@@ -295,11 +301,13 @@ static void fd_recalibrate(FDrive *drv)
     fd_seek(drv, 0, 0, 1, 1);
 }
 
+static FDriveType get_default_drive_type(FDrive *drv);
+
 /* Revalidate a disk drive after a disk change */
 static void fd_revalidate(FDrive *drv)
 {
     int nb_heads, max_track, last_sect, ro;
-    FDriveType drive;
+    FDriveType drive = get_default_drive_type(drv);
     FDriveRate rate;
 
     FLOPPY_DPRINTF("revalidate\n");
@@ -609,6 +617,21 @@ typedef struct FDCtrlISABus {
     int32_t bootindexB;
 } FDCtrlISABus;
 
+static FDriveType get_default_drive_type(FDrive *drv)
+{
+    FDCtrl *fdctrl = drv->fdctrl;
+
+    if (0 < MAX_FD && (&fdctrl->drives[0] == drv)) {
+        return fdctrl->defaultA;
+    }
+
+    if (1 < MAX_FD && (&fdctrl->drives[1] == drv)) {
+        return fdctrl->defaultB;
+    }
+
+    return FDRIVE_DEFAULT;
+}
+
 static uint32_t fdctrl_read (void *opaque, uint32_t reg)
 {
     FDCtrl *fdctrl = opaque;
-- 
2.1.0