| 1 | /* $Id: serial.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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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 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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| 26 | * --------------------------------------------------------------------
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| 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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| 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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| 64 |
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| 65 |
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| 66 | #include <stdint.h>
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| 67 | #include "inlines.h"
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| 68 | #include "biosint.h"
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| 69 |
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| 70 | void BIOSCALL int14_function(pusha_regs_t regs, uint16_t es, uint16_t ds, volatile iret_addr_t iret_addr)
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| 71 | {
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| 72 | uint16_t addr, timer, val16;
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| 73 | uint8_t timeout;
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| 74 |
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| 75 | int_enable();
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| 76 |
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| 77 | addr = read_word(0x0040, (regs.u.r16.dx << 1));
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| 78 | timeout = read_byte(0x0040, 0x007C + regs.u.r16.dx);
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| 79 | if ((regs.u.r16.dx < 4) && (addr > 0)) {
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| 80 | switch (regs.u.r8.ah) {
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| 81 | case 0:
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| 82 | outb(addr+3, inb(addr+3) | 0x80);
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| 83 | if ((regs.u.r8.al & 0xE0) == 0) {
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| 84 | outb(addr, 0x17);
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| 85 | outb(addr+1, 0x04);
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| 86 | } else {
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| 87 | val16 = 0x600 >> ((regs.u.r8.al & 0xE0) >> 5);
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| 88 | outb(addr, val16 & 0xFF);
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| 89 | outb(addr+1, val16 >> 8);
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| 90 | }
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| 91 | outb(addr+3, regs.u.r8.al & 0x1F);
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| 92 | regs.u.r8.ah = inb(addr+5);
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| 93 | regs.u.r8.al = inb(addr+6);
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| 94 | ClearCF(iret_addr.flags);
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| 95 | break;
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| 96 | case 1:
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| 97 | timer = read_word(0x0040, 0x006C);
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| 98 | while (((inb(addr+5) & 0x60) != 0x60) && (timeout)) {
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| 99 | val16 = read_word(0x0040, 0x006C);
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| 100 | if (val16 != timer) {
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| 101 | timer = val16;
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| 102 | timeout--;
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| 103 | }
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| 104 | }
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| 105 | if (timeout) outb(addr, regs.u.r8.al);
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| 106 | regs.u.r8.ah = inb(addr+5);
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| 107 | if (!timeout) regs.u.r8.ah |= 0x80;
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| 108 | ClearCF(iret_addr.flags);
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| 109 | break;
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| 110 | case 2:
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| 111 | timer = read_word(0x0040, 0x006C);
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| 112 | while (((inb(addr+5) & 0x01) == 0) && (timeout)) {
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| 113 | val16 = read_word(0x0040, 0x006C);
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| 114 | if (val16 != timer) {
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| 115 | timer = val16;
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| 116 | timeout--;
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| 117 | }
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| 118 | }
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| 119 | if (timeout) {
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| 120 | regs.u.r8.ah = 0;
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| 121 | regs.u.r8.al = inb(addr);
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| 122 | } else {
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| 123 | regs.u.r8.ah = inb(addr+5);
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| 124 | }
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| 125 | ClearCF(iret_addr.flags);
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| 126 | break;
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| 127 | case 3:
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| 128 | regs.u.r8.ah = inb(addr+5);
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| 129 | regs.u.r8.al = inb(addr+6);
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| 130 | ClearCF(iret_addr.flags);
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| 131 | break;
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| 132 | default:
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| 133 | SetCF(iret_addr.flags); // Unsupported
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| 134 | }
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| 135 | } else {
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| 136 | SetCF(iret_addr.flags); // Unsupported
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| 137 | }
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| 138 | }
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