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| author | Shao Miller <shao.miller@yrdsb.edu.on.ca> | 2009-11-19 20:20:33 -0500 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-11-19 17:54:56 -0800 |
| commit | a59acfdc096be06d1319ee4010eea8abc7b9824e (patch) | |
| tree | bb4647b3ae1ccbfd8ea2f5d6ea073df4ee88798a | |
| parent | d16e510b31b54969d384b70f2ec83a24dae0b448 (diff) | |
| download | syslinux-3.84-pre4.tar.gz | |
memdisk: Restore DL for INT 13h, AH=15h, DL=floppysyslinux-3.84-pre4
At least PC-DOS requires this to avoid an infinite loop; the DL we
restore is not the same DL that we call the underlying BIOS with, but
rather the original one (before the decrement.) PC-DOS loops over all
the floppies and relies on the call preserving DL in order to advance
the loop.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| -rw-r--r-- | memdisk/memdisk.inc | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/memdisk/memdisk.inc b/memdisk/memdisk.inc index 98ad52b7..a37218b5 100644 --- a/memdisk/memdisk.inc +++ b/memdisk/memdisk.inc @@ -174,7 +174,9 @@ Int13Start: cmp byte [cs:SavedAX+1],08h ; Get drive params function? je .norestoredl ; DL = number of drives cmp byte [cs:SavedAX+1],15h ; Get disk type function? - je .norestoredl ; CX:DX = size of device + jne .restoredl + test byte [bp+4],80h ; Hard disk? + jnz .norestoredl ; CX:DX = size of device .restoredl: mov dl,[bp+4] .norestoredl: |