diff options
Diffstat (limited to 'src/VBox/Devices/PC/BIOS/serial.c')
| -rw-r--r-- | src/VBox/Devices/PC/BIOS/serial.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/src/VBox/Devices/PC/BIOS/serial.c b/src/VBox/Devices/PC/BIOS/serial.c new file mode 100644 index 00000000..c7bdfc0b --- /dev/null +++ b/src/VBox/Devices/PC/BIOS/serial.c @@ -0,0 +1,138 @@ +/* $Id: serial.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" + +void BIOSCALL int14_function(pusha_regs_t regs, uint16_t es, uint16_t ds, volatile iret_addr_t iret_addr) +{ + uint16_t addr, timer, val16; + uint8_t timeout; + + int_enable(); + + addr = read_word(0x0040, (regs.u.r16.dx << 1)); + timeout = read_byte(0x0040, 0x007C + regs.u.r16.dx); + if ((regs.u.r16.dx < 4) && (addr > 0)) { + switch (regs.u.r8.ah) { + case 0: + outb(addr+3, inb(addr+3) | 0x80); + if ((regs.u.r8.al & 0xE0) == 0) { + outb(addr, 0x17); + outb(addr+1, 0x04); + } else { + val16 = 0x600 >> ((regs.u.r8.al & 0xE0) >> 5); + outb(addr, val16 & 0xFF); + outb(addr+1, val16 >> 8); + } + outb(addr+3, regs.u.r8.al & 0x1F); + regs.u.r8.ah = inb(addr+5); + regs.u.r8.al = inb(addr+6); + ClearCF(iret_addr.flags); + break; + case 1: + timer = read_word(0x0040, 0x006C); + while (((inb(addr+5) & 0x60) != 0x60) && (timeout)) { + val16 = read_word(0x0040, 0x006C); + if (val16 != timer) { + timer = val16; + timeout--; + } + } + if (timeout) outb(addr, regs.u.r8.al); + regs.u.r8.ah = inb(addr+5); + if (!timeout) regs.u.r8.ah |= 0x80; + ClearCF(iret_addr.flags); + break; + case 2: + timer = read_word(0x0040, 0x006C); + while (((inb(addr+5) & 0x01) == 0) && (timeout)) { + val16 = read_word(0x0040, 0x006C); + if (val16 != timer) { + timer = val16; + timeout--; + } + } + if (timeout) { + regs.u.r8.ah = 0; + regs.u.r8.al = inb(addr); + } else { + regs.u.r8.ah = inb(addr+5); + } + ClearCF(iret_addr.flags); + break; + case 3: + regs.u.r8.ah = inb(addr+5); + regs.u.r8.al = inb(addr+6); + ClearCF(iret_addr.flags); + break; + default: + SetCF(iret_addr.flags); // Unsupported + } + } else { + SetCF(iret_addr.flags); // Unsupported + } +} |