1 files changed, 101 insertions, 0 deletions
diff --git a/src/VBox/Devices/PC/BIOS/parallel.c b/src/VBox/Devices/PC/BIOS/parallel.c
new file mode 100644
index 00000000..5a4cbe6b
--- /dev/null
+++ b/src/VBox/Devices/PC/BIOS/parallel.c
@@ -0,0 +1,101 @@
+/* $Id: parallel.c $ */
+/** @file
+ * PC BIOS - ???
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ * --------------------------------------------------------------------
+ *
+ * This code is based on:
+ *
+ *  ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
+ *
+ *  Copyright (C) 2002  MandrakeSoft S.A.
+ *
+ *    MandrakeSoft S.A.
+ *    43, rue d'Aboukir
+ *    75002 Paris - France
+ *    http://www.linux-mandrake.com/
+ *    http://www.mandrakesoft.com/
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ *
+ */
+
+/*
+ * Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
+ * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
+ * the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
+ * a choice of LGPL license versions is made available with the language indicating
+ * that LGPLv2 or any later version may be used, or where a choice of which version
+ * of the LGPL is applied is otherwise unspecified.
+ */
+
+
+#include <stdint.h>
+#include "biosint.h"
+#include "inlines.h"
+
+void BIOSCALL int17_function(pusha_regs_t regs, uint16_t es, uint16_t ds, volatile iret_addr_t iret_addr)
+{
+    uint16_t    addr,timeout;
+    uint8_t     val8;
+
+    int_enable();
+
+    addr = read_word(0x0040, (regs.u.r16.dx << 1) + 8);
+    if ((regs.u.r8.ah < 3) && (regs.u.r16.dx < 3) && (addr > 0)) {
+        timeout = read_byte(0x0040, 0x0078 + regs.u.r16.dx) << 8;
+        if (regs.u.r8.ah == 0) {
+            outb(addr, regs.u.r8.al);
+            val8 = inb(addr+2);
+            outb(addr+2, val8 | 0x01); // send strobe
+            outb(addr+2, val8 & ~0x01);
+            while (((inb(addr+1) & 0x40) == 0x40) && (timeout)) {
+                timeout--;
+            }
+        }
+        if (regs.u.r8.ah == 1) {
+            val8 = inb(addr+2);
+            outb(addr+2, val8 & ~0x04); // send init
+            outb(addr+2, val8 | 0x04);
+        }
+        val8 = inb(addr+1);
+        regs.u.r8.ah = (val8 ^ 0x48);
+        if (!timeout) regs.u.r8.ah |= 0x01;
+        ClearCF(iret_addr.flags);
+    } else {
+        SetCF(iret_addr.flags); // Unsupported
+    }
+}