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diff --git a/src/VBox/Devices/PC/BIOS/print.c b/src/VBox/Devices/PC/BIOS/print.c
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+/* $Id: print.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 <stdarg.h>
+#include "inlines.h"
+#include "biosint.h"
+
+// Debug printf support
+
+/* Redirect INFO output to backdoor logging port. */
+#define INFO_PORT 0x504
+#define DEBUG_PORT 0x403
+
+const char bios_prefix_string[] = "BIOS: ";
+
+void wrch(uint8_t c);
+#pragma aux wrch = "mov ah, 0eh" "int 10h" parm [al] modify exact [ax bx];
+
+void send(uint16_t action, uint8_t c)
+{
+#if BX_DEBUG_SERIAL
+ if (c == '\n')
+ uart_tx_byte(BX_DEBUG_PORT, '\r');
+ uart_tx_byte(BX_DEBUG_PORT, c);
+#endif
+#if BX_VIRTUAL_PORTS
+ if (action & BIOS_PRINTF_DEBUG)
+ outb(DEBUG_PORT, c);
+ if (action & BIOS_PRINTF_INFO)
+ outb(INFO_PORT, c);
+#endif
+ if (action & BIOS_PRINTF_SCREEN) {
+ if (c == '\n')
+ wrch('\r');
+ wrch(c);
+ }
+}
+
+void put_int(uint16_t action, short val, short width, bx_bool neg)
+{
+ short nval = val / 10;
+ if (nval)
+ put_int(action, nval, width - 1, neg);
+ else {
+ while (--width > 0)
+ send(action, ' ');
+ if (neg)
+ send(action, '-');
+ }
+ send(action, val - (nval * 10) + '0');
+}
+
+void put_uint(uint16_t action, unsigned short val, short width, bx_bool neg)
+{
+ unsigned short nval = val / 10;
+ if (nval)
+ put_uint(action, nval, width - 1, neg);
+ else {
+ while (--width > 0)
+ send(action, ' ');
+ if (neg)
+ send(action, '-');
+ }
+ send(action, val - (nval * 10) + '0');
+}
+
+void put_luint(uint16_t action, unsigned long val, short width, bx_bool neg)
+{
+ unsigned long nval = val / 10;
+ if (nval)
+ put_luint(action, nval, width - 1, neg);
+ else {
+ while (--width > 0)
+ send(action, ' ');
+ if (neg)
+ send(action, '-');
+ }
+ send(action, val - (nval * 10) + '0');
+}
+
+void put_str(uint16_t action, const char __far *s)
+{
+ uint8_t c;
+
+ while (c = *s) {
+ send(action, c);
+ s++;
+ }
+}
+
+void put_str_near(uint16_t action, const char __near *s)
+{
+ uint8_t c;
+
+ while (c = *s) {
+ send(action, c);
+ s++;
+ }
+}
+
+
+//--------------------------------------------------------------------------
+// bios_printf()
+// A compact variable argument printf function.
+//
+// Supports %[format_width][length]format
+// where format can be x,X,u,d,s,S,c
+// and the optional length modifier is l (ell, long 32-bit) or ll
+// (long long, 64-bit).
+// Only x,X work with ll
+//--------------------------------------------------------------------------
+void bios_printf(uint16_t action, const char *s, ...)
+{
+ uint8_t c;
+ bx_bool in_format;
+ int i;
+ uint16_t arg, nibble, hibyte, format_width, hexadd;
+ va_list args;
+
+ va_start( args, s );
+
+ in_format = 0;
+ format_width = 0;
+
+ if ((action & BIOS_PRINTF_DEBHALT) == BIOS_PRINTF_DEBHALT) {
+ bios_printf (BIOS_PRINTF_SCREEN, "FATAL: ");
+ }
+
+ while (c = *s) {
+ if ( c == '%' ) {
+ in_format = 1;
+ format_width = 0;
+ }
+ else if (in_format) {
+ if ( (c>='0') && (c<='9') ) {
+ format_width = (format_width * 10) + (c - '0');
+ }
+ else {
+ arg = va_arg( args, uint16_t );
+ if (c == 'x' || c == 'X') {
+ if (format_width == 0)
+ format_width = 4;
+ if (c == 'x')
+ hexadd = 'a';
+ else
+ hexadd = 'A';
+ for (i=format_width-1; i>=0; i--) {
+ nibble = (arg >> (4 * i)) & 0x000f;
+ send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd));
+ }
+ }
+ else if (c == 'u') {
+ put_uint(action, arg, format_width, 0);
+ }
+ else if (c == 'l' && s[1] == 'l') {
+ uint64_t llval;
+ uint16_t __far *cp16;
+
+ s += 2;
+ c = *s;
+ cp16 = (uint16_t __far *)&llval;
+ cp16[0] = arg;
+ cp16[1] = va_arg( args, uint16_t );
+ cp16[2] = va_arg( args, uint16_t );
+ cp16[3] = va_arg( args, uint16_t );
+ if (c == 'x' || c == 'X') {
+ if (format_width == 0)
+ format_width = 16;
+ if (c == 'x')
+ hexadd = 'a';
+ else
+ hexadd = 'A';
+ for (i=format_width-1; i>=0; i--) {
+ nibble = (llval >> (i * 4)) & 0x000f;
+ send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd));
+ }
+ } else {
+ BX_PANIC("bios_printf: unknown %ll format\n");
+ }
+ }
+ else if (c == 'l') {
+ s++;
+ c = *s; /* is it ld,lx,lu? */
+ hibyte = va_arg( args, uint16_t );
+ if (c == 'd') {
+ if (hibyte & 0x8000)
+ put_luint(action, 0L-(((uint32_t) hibyte << 16) | arg), format_width-1, 1);
+ else
+ put_luint(action, ((uint32_t) hibyte << 16) | arg, format_width, 0);
+ }
+ else if (c == 'u') {
+ put_luint(action, ((uint32_t) hibyte << 16) | arg, format_width, 0);
+ }
+ else if (c == 'x' || c == 'X')
+ {
+ if (format_width == 0)
+ format_width = 8;
+ if (c == 'x')
+ hexadd = 'a';
+ else
+ hexadd = 'A';
+ for (i=format_width-1; i>=0; i--) {
+ nibble = ((((uint32_t)hibyte << 16) | arg) >> (4 * i)) & 0x000f;
+ send (action, (nibble<=9)? (nibble+'0') : (nibble-10+hexadd));
+ }
+ }
+ }
+ else if (c == 'd') {
+ if (arg & 0x8000)
+ put_int(action, -arg, format_width - 1, 1);
+ else
+ put_int(action, arg, format_width, 0);
+ }
+ else if (c == 's') {
+ put_str(action, (char *)arg);
+ }
+ else if (c == 'S') {
+ hibyte = arg;
+ arg = va_arg( args, uint16_t );
+ put_str(action, hibyte :> (char *)arg);
+ }
+ else if (c == 'c') {
+ send(action, arg);
+ }
+ else
+ BX_PANIC("bios_printf: unknown format\n");
+ in_format = 0;
+ }
+ }
+ else {
+ send(action, c);
+ }
+ ++s;
+ }
+ va_end( args );
+ if (action & BIOS_PRINTF_HALT) {
+ // freeze in a busy loop.
+ int_disable();
+ halt_forever();
+ }
+}
+
+// End of printf support
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