| 1 | /*
|
|---|
| 2 | * Copyright (C) 2006-2017 Oracle Corporation
|
|---|
| 3 | *
|
|---|
| 4 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 5 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 6 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 7 | * General Public License (GPL) as published by the Free Software
|
|---|
| 8 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 9 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 10 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 11 | *
|
|---|
| 12 | * This code is based on:
|
|---|
| 13 | *
|
|---|
| 14 | * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
|
|---|
| 15 | *
|
|---|
| 16 | * Copyright (C) 2002 MandrakeSoft S.A.
|
|---|
| 17 | *
|
|---|
| 18 | * MandrakeSoft S.A.
|
|---|
| 19 | * 43, rue d'Aboukir
|
|---|
| 20 | * 75002 Paris - France
|
|---|
| 21 | * http://www.linux-mandrake.com/
|
|---|
| 22 | * http://www.mandrakesoft.com/
|
|---|
| 23 | *
|
|---|
| 24 | * This library is free software; you can redistribute it and/or
|
|---|
| 25 | * modify it under the terms of the GNU Lesser General Public
|
|---|
| 26 | * License as published by the Free Software Foundation; either
|
|---|
| 27 | * version 2 of the License, or (at your option) any later version.
|
|---|
| 28 | *
|
|---|
| 29 | * This library is distributed in the hope that it will be useful,
|
|---|
| 30 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 31 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 32 | * Lesser General Public License for more details.
|
|---|
| 33 | *
|
|---|
| 34 | * You should have received a copy of the GNU Lesser General Public
|
|---|
| 35 | * License along with this library; if not, write to the Free Software
|
|---|
| 36 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|---|
| 37 | *
|
|---|
| 38 | */
|
|---|
| 39 |
|
|---|
| 40 |
|
|---|
| 41 | #include <stdint.h>
|
|---|
| 42 | #include "inlines.h"
|
|---|
| 43 | #include "biosint.h"
|
|---|
| 44 |
|
|---|
| 45 | void BIOSCALL int14_function(pusha_regs_t regs, uint16_t es, uint16_t ds, volatile iret_addr_t iret_addr)
|
|---|
| 46 | {
|
|---|
| 47 | uint16_t addr, timer, val16;
|
|---|
| 48 | uint8_t timeout;
|
|---|
| 49 |
|
|---|
| 50 | int_enable();
|
|---|
| 51 |
|
|---|
| 52 | addr = read_word(0x0040, (regs.u.r16.dx << 1));
|
|---|
| 53 | timeout = read_byte(0x0040, 0x007C + regs.u.r16.dx);
|
|---|
| 54 | if ((regs.u.r16.dx < 4) && (addr > 0)) {
|
|---|
| 55 | switch (regs.u.r8.ah) {
|
|---|
| 56 | case 0:
|
|---|
| 57 | outb(addr+3, inb(addr+3) | 0x80);
|
|---|
| 58 | if ((regs.u.r8.al & 0xE0) == 0) {
|
|---|
| 59 | outb(addr, 0x17);
|
|---|
| 60 | outb(addr+1, 0x04);
|
|---|
| 61 | } else {
|
|---|
| 62 | val16 = 0x600 >> ((regs.u.r8.al & 0xE0) >> 5);
|
|---|
| 63 | outb(addr, val16 & 0xFF);
|
|---|
| 64 | outb(addr+1, val16 >> 8);
|
|---|
| 65 | }
|
|---|
| 66 | outb(addr+3, regs.u.r8.al & 0x1F);
|
|---|
| 67 | regs.u.r8.ah = inb(addr+5);
|
|---|
| 68 | regs.u.r8.al = inb(addr+6);
|
|---|
| 69 | ClearCF(iret_addr.flags);
|
|---|
| 70 | break;
|
|---|
| 71 | case 1:
|
|---|
| 72 | timer = read_word(0x0040, 0x006C);
|
|---|
| 73 | while (((inb(addr+5) & 0x60) != 0x60) && (timeout)) {
|
|---|
| 74 | val16 = read_word(0x0040, 0x006C);
|
|---|
| 75 | if (val16 != timer) {
|
|---|
| 76 | timer = val16;
|
|---|
| 77 | timeout--;
|
|---|
| 78 | }
|
|---|
| 79 | }
|
|---|
| 80 | if (timeout) outb(addr, regs.u.r8.al);
|
|---|
| 81 | regs.u.r8.ah = inb(addr+5);
|
|---|
| 82 | if (!timeout) regs.u.r8.ah |= 0x80;
|
|---|
| 83 | ClearCF(iret_addr.flags);
|
|---|
| 84 | break;
|
|---|
| 85 | case 2:
|
|---|
| 86 | timer = read_word(0x0040, 0x006C);
|
|---|
| 87 | while (((inb(addr+5) & 0x01) == 0) && (timeout)) {
|
|---|
| 88 | val16 = read_word(0x0040, 0x006C);
|
|---|
| 89 | if (val16 != timer) {
|
|---|
| 90 | timer = val16;
|
|---|
| 91 | timeout--;
|
|---|
| 92 | }
|
|---|
| 93 | }
|
|---|
| 94 | if (timeout) {
|
|---|
| 95 | regs.u.r8.ah = 0;
|
|---|
| 96 | regs.u.r8.al = inb(addr);
|
|---|
| 97 | } else {
|
|---|
| 98 | regs.u.r8.ah = inb(addr+5);
|
|---|
| 99 | }
|
|---|
| 100 | ClearCF(iret_addr.flags);
|
|---|
| 101 | break;
|
|---|
| 102 | case 3:
|
|---|
| 103 | regs.u.r8.ah = inb(addr+5);
|
|---|
| 104 | regs.u.r8.al = inb(addr+6);
|
|---|
| 105 | ClearCF(iret_addr.flags);
|
|---|
| 106 | break;
|
|---|
| 107 | default:
|
|---|
| 108 | SetCF(iret_addr.flags); // Unsupported
|
|---|
| 109 | }
|
|---|
| 110 | } else {
|
|---|
| 111 | SetCF(iret_addr.flags); // Unsupported
|
|---|
| 112 | }
|
|---|
| 113 | }
|
|---|
