Changeset 47036 in vbox for trunk/include/VBox/vmm

Timestamp:

Jul 8, 2013 12:26:47 PM (12 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

87069

Message:

BIOS,DevFdc,DrvBlock: The floppy controller should query the block/host driver for the drive type, or it'll all go real bad if the guest code trusts CMOS/BIOS drive info. Changed the block driver to automatically upgrade the drive type (for fdc and bios/cmos setup only) if the image is larger than the configured drive capacity. Introduced two fake drive types with max capacities, 15.6 MB and 63.5 MB, the first is the max that INT13 can officially access, the second is reinterpreting CL as holding an 8-bit wide sector number and no cylinder bits (which actually seems to be how real bioses work with floppies).

File:

• trunk/include/VBox/vmm/pdmifs.h (modified) (2 diffs)

trunk/include/VBox/vmm/pdmifs.h

@@ -894 +894 @@
     /** 2.88MB 3 1/2" floppy drive. */
     PDMBLOCKTYPE_FLOPPY_2_88,
+    /** Fake drive that can take up to 15.6 MB images.
+     * C=255, H=2, S=63.  */
+    PDMBLOCKTYPE_FLOPPY_FAKE_15_6,
+    /** Fake drive that can take up to 63.5 MB images.
+     * C=255, H=2, S=255.  */
+    PDMBLOCKTYPE_FLOPPY_FAKE_63_5,
     /** CDROM drive. */
     PDMBLOCKTYPE_CDROM,
@@ -902 +908 @@
 } PDMBLOCKTYPE;
 
+/** Check if the given block type is a floppy. */
+#define PDMBLOCKTYPE_IS_FLOPPY(a_enmType) ( (a_enmType) >= PDMBLOCKTYPE_FLOPPY_360 && (a_enmType) <= PDMBLOCKTYPE_FLOPPY_2_88 )
 
 /**