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/* $Id: parallel.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 "biosint.h"
#include "inlines.h"
void BIOSCALL int17_function(pusha_regs_t regs, uint16_t es, uint16_t ds, volatile iret_addr_t iret_addr)
{
uint16_t addr,timeout;
uint8_t val8;
int_enable();
addr = read_word(0x0040, (regs.u.r16.dx << 1) + 8);
if ((regs.u.r8.ah < 3) && (regs.u.r16.dx < 3) && (addr > 0)) {
timeout = read_byte(0x0040, 0x0078 + regs.u.r16.dx) << 8;
if (regs.u.r8.ah == 0) {
outb(addr, regs.u.r8.al);
val8 = inb(addr+2);
outb(addr+2, val8 | 0x01); // send strobe
outb(addr+2, val8 & ~0x01);
while (((inb(addr+1) & 0x40) == 0x40) && (timeout)) {
timeout--;
}
}
if (regs.u.r8.ah == 1) {
val8 = inb(addr+2);
outb(addr+2, val8 & ~0x04); // send init
outb(addr+2, val8 | 0x04);
}
val8 = inb(addr+1);
regs.u.r8.ah = (val8 ^ 0x48);
if (!timeout) regs.u.r8.ah |= 0x01;
ClearCF(iret_addr.flags);
} else {
SetCF(iret_addr.flags); // Unsupported
}
}
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