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diff --git a/src/VBox/Devices/PC/BIOS/biosint.h b/src/VBox/Devices/PC/BIOS/biosint.h
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+/* $Id: biosint.h $ */
+/** @file
+ * PC BIOS - BIOS internal definitions.
+ */
+
+/*
+ * Copyright (C) 2006-2022 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.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_PC_BIOS_biosint_h
+#define VBOX_INCLUDED_SRC_PC_BIOS_biosint_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+/* Compile-time assertion macro. */
+#define ct_assert(a) extern int ct_ass_arr[!!(a) == 1];
+
+/* For functions called from assembly code. */
+#define BIOSCALL __cdecl
+
+#define BX_ELTORITO_BOOT 1
+#define BX_PCIBIOS 1
+#define BX_USE_PS2_MOUSE 1
+#define BX_APM 1
+
+#ifndef DEBUG_ATA
+# define DEBUG_ATA 0
+#endif
+#ifdef DEBUG_AHCI
+# define DEBUG_AHCI 0
+#endif
+#ifndef DEBUG_SCSI
+# define DEBUG_SCSI 0
+#endif
+#ifndef DEBUG_CD_BOOT
+# define DEBUG_CD_BOOT 0
+#endif
+#ifndef DEBUG_ELTORITO
+# define DEBUG_ELTORITO 0
+#endif
+#ifndef DEBUG_INT13_HD
+# define DEBUG_INT13_HD 0
+#endif
+#ifndef DEBUG_INT13_FL
+# define DEBUG_INT13_FL 0
+#endif
+#ifndef DEBUG_INT13_CD
+# define DEBUG_INT13_CD 0
+#endif
+#ifndef DEBUG_INT15
+# define DEBUG_INT15 0
+#endif
+#ifndef DEBUG_INT15_MS
+# define DEBUG_INT15_MS 0
+#endif
+#ifndef DEBUG_INT16
+# define DEBUG_INT16 0
+#endif
+#ifndef DEBUG_INT1A
+# define DEBUG_INT1A 0
+#endif
+#ifndef DEBUG_INT74
+# define DEBUG_INT74 0
+#endif
+#ifndef DEBUG_PCI
+# define DEBUG_PCI 0
+#endif
+#ifndef DEBUG_APM
+# define DEBUG_APM 0
+#endif
+#ifndef DEBUG_POST
+# define DEBUG_POST 0
+#endif
+
+#define FP_OFF(p) ((unsigned)(p))
+#define FP_SEG(p) ((unsigned)((unsigned long)(void __far*)(p) >> 16))
+#define MK_FP(s,o) (((unsigned short)(s)):>((void __near *)(o)))
+
+typedef struct {
+ union {
+ struct {
+ uint16_t di, si, bp, sp;
+ uint16_t bx, dx, cx, ax;
+ } r16;
+ struct {
+ uint16_t filler[4];
+ uint8_t bl, bh, dl, dh, cl, ch, al, ah;
+ } r8;
+ } u;
+} pusha_regs_t;
+
+typedef struct {
+ union {
+ struct {
+ uint32_t edi, esi, ebp, esp;
+ uint32_t ebx, edx, ecx, eax;
+ } r32;
+ struct {
+ uint16_t di, filler1, si, filler2, bp, filler3, sp, filler4;
+ uint16_t bx, filler5, dx, filler6, cx, filler7, ax, filler8;
+ } r16;
+ struct {
+ uint32_t filler[4];
+ uint8_t bl, bh;
+ uint16_t filler1;
+ uint8_t dl, dh;
+ uint16_t filler2;
+ uint8_t cl, ch;
+ uint16_t filler3;
+ uint8_t al, ah;
+ uint16_t filler4;
+ } r8;
+ } u;
+} pushad_regs_t;
+
+typedef struct {
+ union {
+ struct {
+ uint16_t flags;
+ } r16;
+ struct {
+ uint8_t flagsl;
+ uint8_t flagsh;
+ } r8;
+ } u;
+} flags_t;
+
+typedef struct {
+ uint16_t ip;
+ uint16_t cs;
+ flags_t flags;
+} iret_addr_t;
+
+typedef struct {
+ uint16_t ds;
+ uint16_t es;
+ pusha_regs_t gr;
+ iret_addr_t ra;
+} disk_regs_t;
+
+typedef struct {
+ pusha_regs_t gr;
+ uint16_t es;
+ uint16_t ds;
+ uint16_t ifl;
+ iret_addr_t ra;
+} kbd_regs_t;
+
+typedef struct {
+ pusha_regs_t gr;
+ uint16_t es;
+ uint16_t ds;
+ flags_t fl;
+} sys_regs_t;
+
+typedef struct {
+ pushad_regs_t gr;
+ uint16_t es;
+ uint16_t ds;
+ flags_t fl;
+} sys32_regs_t;
+
+typedef struct {
+ pusha_regs_t gr;
+ iret_addr_t ra;
+} i1apci_regs_t;
+
+
+#define SetCF(x) x.u.r8.flagsl |= 0x01
+#define SetZF(x) x.u.r8.flagsl |= 0x40
+#define ClearCF(x) x.u.r8.flagsl &= 0xfe
+#define ClearZF(x) x.u.r8.flagsl &= 0xbf
+#define GetCF(x) (x.u.r8.flagsl & 0x01)
+
+#define SET_AL(val8) AX = ((AX & 0xff00) | (val8))
+#define SET_BL(val8) BX = ((BX & 0xff00) | (val8))
+#define SET_CL(val8) CX = ((CX & 0xff00) | (val8))
+#define SET_DL(val8) DX = ((DX & 0xff00) | (val8))
+#define SET_AH(val8) AX = ((AX & 0x00ff) | ((val8) << 8))
+#define SET_BH(val8) BX = ((BX & 0x00ff) | ((val8) << 8))
+#define SET_CH(val8) CX = ((CX & 0x00ff) | ((val8) << 8))
+#define SET_DH(val8) DX = ((DX & 0x00ff) | ((val8) << 8))
+
+#define GET_AL() ( AX & 0x00ff )
+#define GET_BL() ( BX & 0x00ff )
+#define GET_CL() ( CX & 0x00ff )
+#define GET_DL() ( DX & 0x00ff )
+#define GET_AH() ( AX >> 8 )
+#define GET_BH() ( BX >> 8 )
+#define GET_CH() ( CX >> 8 )
+#define GET_DH() ( DX >> 8 )
+
+#define GET_ELDL() ( ELDX & 0x00ff )
+#define GET_ELDH() ( ELDX >> 8 )
+
+#define SET_CF() FLAGS |= 0x0001
+#define CLEAR_CF() FLAGS &= 0xfffe
+#define GET_CF() (FLAGS & 0x0001)
+
+#define SET_ZF() FLAGS |= 0x0040
+#define CLEAR_ZF() FLAGS &= 0xffbf
+#define GET_ZF() (FLAGS & 0x0040)
+
+#define SET_IF() FLAGS |= 0x0200
+
+typedef unsigned short bx_bool;
+
+#define BX_VIRTUAL_PORTS 1 /* normal output to Bochs ports */
+#define BX_DEBUG_SERIAL 0 /* output to COM1 */
+
+#define BIOS_PRINTF_HALT 1
+#define BIOS_PRINTF_SCREEN 2
+#define BIOS_PRINTF_INFO 4
+#define BIOS_PRINTF_DEBUG 8
+#define BIOS_PRINTF_ALL (BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO)
+#define BIOS_PRINTF_DEBHALT (BIOS_PRINTF_SCREEN | BIOS_PRINTF_INFO | BIOS_PRINTF_HALT)
+
+extern const char bios_prefix_string[];
+extern void bios_printf(uint16_t action, const char *s, ...);
+extern void put_str(uint16_t action, const char __far *s);
+extern void put_str_near(uint16_t action, const char __near *s);
+extern uint8_t inb_cmos(uint8_t cmos_reg);
+extern void outb_cmos(uint8_t cmos_reg, uint8_t val);
+extern uint16_t get_cmos_word(uint8_t idxFirst);
+extern uint16_t cdrom_boot(void);
+extern void show_logo(void);
+extern void delay_boot(uint16_t secs);
+extern bx_bool set_enable_a20(bx_bool val);
+
+#define printf(...) bios_printf(BIOS_PRINTF_SCREEN, __VA_ARGS__)
+
+// Defines the output macros.
+// BX_DEBUG goes to INFO port until we can easily choose debug info on a
+// per-device basis. Debug info are sent only in debug mode
+#define DEBUG_ROMBIOS 1
+#if DEBUG_ROMBIOS
+# define BX_DEBUG(...) bios_printf(BIOS_PRINTF_INFO, __VA_ARGS__)
+#else
+# define BX_DEBUG(...)
+#endif
+#ifdef VBOX
+#define BX_INFO(...) do { put_str(BIOS_PRINTF_INFO, bios_prefix_string); bios_printf(BIOS_PRINTF_INFO, __VA_ARGS__); } while (0)
+#define BX_INFO_CON(...)do { put_str(BIOS_PRINTF_INFO, bios_prefix_string); bios_printf(BIOS_PRINTF_ALL, __VA_ARGS__); } while (0)
+#else /* !VBOX */
+#define BX_INFO(...) bios_printf(BIOS_PRINTF_INFO, __VA_ARGS__)
+#endif /* !VBOX */
+#define BX_PANIC(...) bios_printf(BIOS_PRINTF_DEBHALT, __VA_ARGS__)
+
+uint16_t pci16_find_device(uint32_t search_item, uint16_t index, int search_class, int ignore_if);
+
+/* Because we don't tell the recompiler when guest physical memory
+ * is written, it can incorrectly cache guest code overwritten by
+ * DMA (bus master or not). We just re-write the memory block to flush
+ * any of its caches. This is not exactly efficient, but works!
+ */
+#define DMA_WORKAROUND 1
+
+/* Random hardware-related definitions. */
+
+#define PIC_MASTER 0x20
+#define PIC_MASTER_MASK 0x21
+#define PIC_SLAVE 0xA0
+#define PIC_SLAVE_MASK 0xA1
+#define PIC_CMD_EOI 0x20
+#define PIC_CMD_RD_ISR 0x0B
+#define PIC_CMD_INIT 0x11
+
+#endif /* !VBOX_INCLUDED_SRC_PC_BIOS_biosint_h */
+
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