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/* $Id: bios.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 "inlines.h"
#include "biosint.h"
#include "VBox/bios.h"
#ifndef VBOX_VERSION_STRING
#include <VBox/version.h>
#endif
static const char bios_cvs_version_string[] = "VirtualBox " VBOX_VERSION_STRING;
uint8_t inb_cmos(uint8_t cmos_reg)
{
uint8_t cmos_port = 0x70;
if (cmos_reg >= 0x80)
cmos_port += 2;
outb(cmos_port, cmos_reg);
return inb(cmos_port + 1);
}
void outb_cmos(uint8_t cmos_reg, uint8_t val)
{
uint8_t cmos_port = 0x70;
if (cmos_reg >= 0x80)
cmos_port += 2;
outb(cmos_port, cmos_reg);
outb(cmos_port + 1, val);
}
/**
* Reads two adjacent cmos bytes and return their values as a 16-bit word.
*/
uint16_t get_cmos_word(uint8_t idxFirst)
{
return ((uint16_t)inb_cmos(idxFirst + 1) << 8)
| inb_cmos(idxFirst);
}
void BIOSCALL dummy_isr_function(pusha_regs_t regs, uint16_t es,
uint16_t ds, iret_addr_t iret_addr)
{
// Interrupt handler for unexpected hardware interrupts. We have to clear
// the PIC because if we don't, the next EOI will clear the wrong interrupt
// and all hell will break loose! This routine also masks the unexpected
// interrupt so it will generally be called only once for each unexpected
// interrupt level.
uint8_t isrA, isrB, imr, last_int = 0xFF;
outb(PIC_MASTER, PIC_CMD_RD_ISR); // Read master ISR
isrA = inb(PIC_MASTER);
if (isrA) {
outb(PIC_SLAVE, PIC_CMD_RD_ISR); // Read slave ISR
isrB = inb(PIC_SLAVE);
if (isrB) {
imr = inb(PIC_SLAVE_MASK);
outb(PIC_SLAVE_MASK, imr | isrB ); // Mask this interrupt
outb(PIC_SLAVE, PIC_CMD_EOI); // Send EOI on slave PIC
} else {
imr = inb(PIC_MASTER_MASK);
isrA &= 0xFB; // Never mask the cascade interrupt
outb(PIC_MASTER_MASK, imr | isrA); // Mask this interrupt
}
outb(PIC_MASTER, PIC_CMD_EOI); // Send EOI on master PIC
last_int = isrA;
}
write_byte(0x40, 0x6B, last_int); // Write INTR_FLAG
}
void BIOSCALL nmi_handler_msg(void)
{
BX_PANIC("NMI Handler called\n");
}
void BIOSCALL int18_panic_msg(void)
{
BX_INFO("INT18: BOOT FAILURE\n");
out_ctrl_str_asm(VBOX_BIOS_SHUTDOWN_PORT, "Bootfail");
}
void BIOSCALL log_bios_start(void)
{
#if BX_DEBUG_SERIAL
outb(BX_DEBUG_PORT+UART_LCR, 0x03); /* setup for serial logging: 8N1 */
#endif
BX_INFO("%s\n", bios_cvs_version_string);
}
/* Set video mode. */
void set_mode(uint8_t mode);
#pragma aux set_mode = \
"mov ah, 0" \
"int 10h" \
parm [al] modify [ax];
/// @todo restore
//#undef VBOX
#define BX_PCIBIOS 1
#define BX_APPNAME "VirtualBox"
#define BIOS_BUILD_DATE __DATE__
//--------------------------------------------------------------------------
// print_bios_banner
// displays a the bios version
//--------------------------------------------------------------------------
void BIOSCALL print_bios_banner(void)
{
#ifdef VBOX
// Skip the logo if a warm boot is requested.
uint16_t warm_boot = read_word(0x0040,0x0072);
write_word(0x0040,0x0072, 0);
if (warm_boot == 0x1234)
{
/* Only set text mode. */
set_mode(3);
return;
}
/* show graphical logo */
show_logo();
#else /* !VBOX */
char *bios_conf;
/* Avoid using preprocessing directives within macro arguments. */
bios_conf =
#ifdef __WATCOMC__
"watcom "
#endif
#if BX_APM
"apmbios "
#endif
#if BX_PCIBIOS
"pcibios "
#endif
#if BX_ELTORITO_BOOT
"eltorito "
#endif
#if BX_ROMBIOS32
"rombios32 "
#endif
"\n\n";
printf(BX_APPNAME" BIOS - build: %s\n%s\nOptions: ",
BIOS_BUILD_DATE, bios_cvs_version_string);
printf(bios_conf, 0);
#endif /* VBOX */
}
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