Changeset 258 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Device/Serial/SerialDPT.asm

Timestamp:

Feb 22, 2012, 7:01:53 PM (12 years ago)

Author:

gregli@…

google:author:

gregli@hotmail.com

Message:

Added floppy drive emulation over the serial connection (MODULE_SERIAL_FLOPPY). Along the way, various optimizations were made to stay within the 8K ROM size target. Also, serial code now returns the number of sectors transferred.

File:

• trunk/XTIDE_Universal_BIOS/Src/Device/Serial/SerialDPT.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Device/Serial/SerialDPT.asm

@@ -11 +11 @@
 ;       ES:SI:  Ptr to 512-byte ATA information read from the drive
 ;   Returns:
-;       Nothing
+;       CF:     Set, indicates that this is a floppy disk
+;               Clear, indicates that this is a hard disk
 ;   Corrupts registers:
 ;       AX
 ;--------------------------------------------------------------------
 SerialDPT_Finalize:
-        or      byte [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE
-        mov     ax, [es:si+ATA6.wVendor]
+        mov     ax, [es:si+ATA6.wSerialPortAndBaud]
         mov     [di+DPT_SERIAL.wSerialPortAndBaud], ax
+
+;
+; Note that this section is not under %ifdef MODULE_SERIAL_FLOPPY.  It is important to 
+; detect floppy disks presented by the server and not treat them like hard disks, even
+; if the floppy support is disabled.
+;
+        mov     al, [es:si+ATA6.wSerialFloppyFlagAndType]
+        or      al, FLGH_DPT_SERIAL_DEVICE
+        or      byte [di+DPT.bFlagsHigh], al
+
+        test    al, FLGH_DPT_SERIAL_FLOPPY           ; clears CF
+        jz      .notfloppy
+        stc     
+.notfloppy:     
+        
         ret