mbr/isohdpfx.S: Clear CX on INT 13h AH 41h failure

If anything goes wrong, clear CX in case it contains garbage. Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
ppokorny · Mar 28, 2017 · 8739e2f · 8739e2f
1 parent 32c0902
commit 8739e2f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S
@@ -167,8 +167,10 @@ next:
 	   read_sector_cbios: movb $0x42, %ah ;  jmp read_common */
 	movl	$0xeb42b4+((read_common-read_sector_cbios-4) << 24), \
 		(read_sector_cbios)
-	jmp	1f
+	jmp	2f
 1:
+	xor	%cx, %cx	/* Clear EBIOS flag. */
+2:
 	popw	%dx
 	pushw	%cx		/* EBIOS flag */