[69501] | 1 | /* $Id: bios.c 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PC BIOS - ???
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| 4 | */
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| 5 |
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[38699] | 6 | /*
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[98103] | 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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[38699] | 8 | *
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[96407] | 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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[69498] | 26 | * --------------------------------------------------------------------
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[38699] | 27 | *
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| 28 | * This code is based on:
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| 29 | *
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| 30 | * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
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| 31 | *
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| 32 | * Copyright (C) 2002 MandrakeSoft S.A.
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| 33 | *
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| 34 | * MandrakeSoft S.A.
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| 35 | * 43, rue d'Aboukir
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| 36 | * 75002 Paris - France
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| 37 | * http://www.linux-mandrake.com/
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| 38 | * http://www.mandrakesoft.com/
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| 39 | *
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| 40 | * This library is free software; you can redistribute it and/or
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| 41 | * modify it under the terms of the GNU Lesser General Public
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| 42 | * License as published by the Free Software Foundation; either
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| 43 | * version 2 of the License, or (at your option) any later version.
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| 44 | *
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| 45 | * This library is distributed in the hope that it will be useful,
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| 46 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 47 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 48 | * Lesser General Public License for more details.
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| 49 | *
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| 50 | * You should have received a copy of the GNU Lesser General Public
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| 51 | * License along with this library; if not, write to the Free Software
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| 52 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 53 | *
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| 54 | */
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| 55 |
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[69501] | 56 | /*
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| 57 | * Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
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| 58 | * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
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| 59 | * the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
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| 60 | * a choice of LGPL license versions is made available with the language indicating
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| 61 | * that LGPLv2 or any later version may be used, or where a choice of which version
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| 62 | * of the LGPL is applied is otherwise unspecified.
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| 63 | */
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[38699] | 64 |
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[69501] | 65 |
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[38699] | 66 | #include <stdint.h>
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| 67 | #include "inlines.h"
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| 68 | #include "biosint.h"
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[84752] | 69 | #include "VBox/bios.h"
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[42258] | 70 | #ifndef VBOX_VERSION_STRING
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[42147] | 71 | #include <VBox/version.h>
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[42258] | 72 | #endif
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[38699] | 73 |
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| 74 | static const char bios_cvs_version_string[] = "VirtualBox " VBOX_VERSION_STRING;
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| 75 |
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| 76 | uint8_t inb_cmos(uint8_t cmos_reg)
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| 77 | {
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[50090] | 78 | uint8_t cmos_port = 0x70;
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| 79 |
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| 80 | if (cmos_reg >= 0x80)
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| 81 | cmos_port += 2;
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| 82 | outb(cmos_port, cmos_reg);
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| 83 | return inb(cmos_port + 1);
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[38699] | 84 | }
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| 85 |
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| 86 | void outb_cmos(uint8_t cmos_reg, uint8_t val)
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| 87 | {
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[50090] | 88 | uint8_t cmos_port = 0x70;
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| 89 |
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| 90 | if (cmos_reg >= 0x80)
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| 91 | cmos_port += 2;
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| 92 | outb(cmos_port, cmos_reg);
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| 93 | outb(cmos_port + 1, val);
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[38699] | 94 | }
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| 95 |
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[92290] | 96 | /**
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| 97 | * Reads two adjacent cmos bytes and return their values as a 16-bit word.
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| 98 | */
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| 99 | uint16_t get_cmos_word(uint8_t idxFirst)
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| 100 | {
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| 101 | return ((uint16_t)inb_cmos(idxFirst + 1) << 8)
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| 102 | | inb_cmos(idxFirst);
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| 103 | }
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| 104 |
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[38699] | 105 | void BIOSCALL dummy_isr_function(pusha_regs_t regs, uint16_t es,
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| 106 | uint16_t ds, iret_addr_t iret_addr)
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| 107 | {
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| 108 | // Interrupt handler for unexpected hardware interrupts. We have to clear
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| 109 | // the PIC because if we don't, the next EOI will clear the wrong interrupt
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| 110 | // and all hell will break loose! This routine also masks the unexpected
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| 111 | // interrupt so it will generally be called only once for each unexpected
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| 112 | // interrupt level.
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| 113 | uint8_t isrA, isrB, imr, last_int = 0xFF;
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[48947] | 114 |
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[38699] | 115 | outb(PIC_MASTER, PIC_CMD_RD_ISR); // Read master ISR
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| 116 | isrA = inb(PIC_MASTER);
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| 117 | if (isrA) {
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| 118 | outb(PIC_SLAVE, PIC_CMD_RD_ISR); // Read slave ISR
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| 119 | isrB = inb(PIC_SLAVE);
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| 120 | if (isrB) {
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| 121 | imr = inb(PIC_SLAVE_MASK);
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| 122 | outb(PIC_SLAVE_MASK, imr | isrB ); // Mask this interrupt
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| 123 | outb(PIC_SLAVE, PIC_CMD_EOI); // Send EOI on slave PIC
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| 124 | } else {
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| 125 | imr = inb(PIC_MASTER_MASK);
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| 126 | isrA &= 0xFB; // Never mask the cascade interrupt
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| 127 | outb(PIC_MASTER_MASK, imr | isrA); // Mask this interrupt
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| 128 | }
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| 129 | outb(PIC_MASTER, PIC_CMD_EOI); // Send EOI on master PIC
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| 130 | last_int = isrA;
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| 131 | }
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| 132 | write_byte(0x40, 0x6B, last_int); // Write INTR_FLAG
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| 133 | }
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| 134 |
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| 135 |
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| 136 | void BIOSCALL nmi_handler_msg(void)
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| 137 | {
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| 138 | BX_PANIC("NMI Handler called\n");
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| 139 | }
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| 140 |
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| 141 | void BIOSCALL int18_panic_msg(void)
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| 142 | {
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[84752] | 143 | BX_INFO("INT18: BOOT FAILURE\n");
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| 144 | out_ctrl_str_asm(VBOX_BIOS_SHUTDOWN_PORT, "Bootfail");
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[38699] | 145 | }
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| 146 |
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| 147 | void BIOSCALL log_bios_start(void)
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| 148 | {
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| 149 | #if BX_DEBUG_SERIAL
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| 150 | outb(BX_DEBUG_PORT+UART_LCR, 0x03); /* setup for serial logging: 8N1 */
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| 151 | #endif
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| 152 | BX_INFO("%s\n", bios_cvs_version_string);
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| 153 | }
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| 154 |
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[40960] | 155 | /* Set video mode. */
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| 156 | void set_mode(uint8_t mode);
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| 157 | #pragma aux set_mode = \
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| 158 | "mov ah, 0" \
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| 159 | "int 10h" \
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| 160 | parm [al] modify [ax];
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| 161 |
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[63562] | 162 | /// @todo restore
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[38699] | 163 | //#undef VBOX
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| 164 |
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| 165 | #define BX_PCIBIOS 1
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| 166 | #define BX_APPNAME "VirtualBox"
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| 167 | #define BIOS_BUILD_DATE __DATE__
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| 168 | //--------------------------------------------------------------------------
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| 169 | // print_bios_banner
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| 170 | // displays a the bios version
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| 171 | //--------------------------------------------------------------------------
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| 172 | void BIOSCALL print_bios_banner(void)
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| 173 | {
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| 174 | #ifdef VBOX
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| 175 | // Skip the logo if a warm boot is requested.
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| 176 | uint16_t warm_boot = read_word(0x0040,0x0072);
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| 177 | write_word(0x0040,0x0072, 0);
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| 178 | if (warm_boot == 0x1234)
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[40960] | 179 | {
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| 180 | /* Only set text mode. */
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| 181 | set_mode(3);
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[38699] | 182 | return;
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[40960] | 183 | }
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[38699] | 184 | /* show graphical logo */
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| 185 | show_logo();
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| 186 | #else /* !VBOX */
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| 187 | char *bios_conf;
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| 188 |
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| 189 | /* Avoid using preprocessing directives within macro arguments. */
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[48947] | 190 | bios_conf =
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[38699] | 191 | #ifdef __WATCOMC__
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| 192 | "watcom "
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| 193 | #endif
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| 194 | #if BX_APM
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| 195 | "apmbios "
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| 196 | #endif
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| 197 | #if BX_PCIBIOS
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| 198 | "pcibios "
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| 199 | #endif
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| 200 | #if BX_ELTORITO_BOOT
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| 201 | "eltorito "
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| 202 | #endif
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| 203 | #if BX_ROMBIOS32
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| 204 | "rombios32 "
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| 205 | #endif
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| 206 | "\n\n";
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| 207 |
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| 208 | printf(BX_APPNAME" BIOS - build: %s\n%s\nOptions: ",
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| 209 | BIOS_BUILD_DATE, bios_cvs_version_string);
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| 210 | printf(bios_conf, 0);
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| 211 | #endif /* VBOX */
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| 212 | }
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