1 | /*
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2 | * Copyright (C) 2006-2015 Oracle Corporation
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3 | *
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4 | * This file is part of VirtualBox Open Source Edition (OSE), as
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5 | * available from http://www.virtualbox.org. This file is free software;
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6 | * you can redistribute it and/or modify it under the terms of the GNU
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7 | * General Public License (GPL) as published by the Free Software
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8 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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9 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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10 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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11 | * --------------------------------------------------------------------
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12 | *
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13 | * This code is based on:
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14 | *
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15 | * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
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16 | *
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17 | * Copyright (C) 2002 MandrakeSoft S.A.
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18 | *
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19 | * MandrakeSoft S.A.
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20 | * 43, rue d'Aboukir
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21 | * 75002 Paris - France
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22 | * http://www.linux-mandrake.com/
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23 | * http://www.mandrakesoft.com/
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24 | *
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25 | * This library is free software; you can redistribute it and/or
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26 | * modify it under the terms of the GNU Lesser General Public
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27 | * License as published by the Free Software Foundation; either
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28 | * version 2 of the License, or (at your option) any later version.
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29 | *
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30 | * This library is distributed in the hope that it will be useful,
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31 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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33 | * Lesser General Public License for more details.
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34 | *
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35 | * You should have received a copy of the GNU Lesser General Public
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36 | * License along with this library; if not, write to the Free Software
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37 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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38 | *
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39 | */
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40 |
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41 |
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42 | #include <stdint.h>
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43 | #include <string.h>
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44 | #include "inlines.h"
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45 | #include "biosint.h"
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46 | #include "ebda.h"
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47 |
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48 | /* Sanity check the LAN boot segment definition. */
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49 | #if VBOX_LANBOOT_SEG < 0xA000
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50 | #error VBOX_LANBOOT_SEG incorrect!
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51 | #endif
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52 |
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53 | /* PnP header used with LAN boot ROMs. */
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54 | typedef struct {
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55 | uint32_t sig;
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56 | uint8_t revision;
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57 | uint8_t length;
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58 | uint16_t next_s;
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59 | uint8_t pad1;
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60 | uint8_t checksum;
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61 | uint32_t dev_id;
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62 | uint16_t mfg_string;
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63 | uint16_t prod_string;
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64 | uint8_t base_class;
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65 | uint8_t subclass;
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66 | uint8_t interface;
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67 | uint8_t dev_ind;
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68 | uint16_t boot_code;
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69 | uint16_t dv;
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70 | uint16_t bev;
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71 | uint16_t pad2;
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72 | uint16_t sriv;
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73 | } pnp_exp_t;
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74 |
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75 |
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76 | int read_boot_sec(uint8_t bootdrv, uint16_t segment);
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77 | #pragma aux read_boot_sec = \
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78 | "mov ax,0201h" \
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79 | "mov dh,0" \
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80 | "mov cx,1" \
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81 | "xor bx,bx" \
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82 | "int 13h" \
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83 | "mov ax,0" \
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84 | "sbb ax,0" \
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85 | parm [dl] [es] modify [ax bx cx dx];
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86 |
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87 | //--------------------------------------------------------------------------
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88 | // print_boot_device
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89 | // displays the boot device
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90 | //--------------------------------------------------------------------------
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91 |
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92 | static const char drivetypes[][10]={"Floppy","Hard Disk","CD-ROM","LAN"};
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93 |
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94 | //@todo: pass inputs as bit flags rather than bytes?
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95 | void print_boot_device(uint8_t cdboot, uint8_t lanboot, uint8_t drive)
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96 | {
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97 | int i;
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98 |
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99 | // cdboot contains 0 if lan/floppy/harddisk, 1 otherwise
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100 | // lanboot contains 0 if floppy/harddisk, 1 otherwise
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101 | // drive contains real/emulated boot drive
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102 |
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103 | if(cdboot)i=2; // CD-Rom
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104 | else if(lanboot)i=3; // LAN
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105 | else if((drive&0x0080)==0x00)i=0; // Floppy
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106 | else if((drive&0x0080)==0x80)i=1; // Hard drive
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107 | else return;
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108 |
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109 | BX_INFO("Booting from %s...\n",drivetypes[i]);
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110 | }
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111 |
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112 | //--------------------------------------------------------------------------
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113 | // print_boot_failure
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114 | // displays the reason why boot failed
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115 | //--------------------------------------------------------------------------
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116 | //@todo: pass inputs as bit flags rather than bytes?
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117 | void print_boot_failure(uint8_t cdboot, uint8_t lanboot, uint8_t drive,
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118 | uint8_t reason, uint8_t lastdrive)
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119 | {
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120 | uint16_t drivenum = drive&0x7f;
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121 |
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122 | // cdboot: 1 if boot from cd, 0 otherwise
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123 | // lanboot: 1 if boot from lan, 0 otherwise
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124 | // drive : drive number
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125 | // reason: 0 signature check failed, 1 read error
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126 | // lastdrive: 1 boot drive is the last one in boot sequence
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127 |
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128 | if (cdboot)
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129 | BX_INFO("Boot from %s failed\n",drivetypes[2]);
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130 | else if (lanboot)
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131 | BX_INFO("Boot from %s failed\n",drivetypes[3]);
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132 | else if (drive & 0x80)
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133 | BX_INFO("Boot from %s %d failed\n", drivetypes[1],drivenum);
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134 | else
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135 | BX_INFO("Boot from %s %d failed\n", drivetypes[0],drivenum);
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136 |
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137 | if (lastdrive==1) {
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138 | if (reason==0)
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139 | BX_PANIC("No bootable medium found! System halted.\n");
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140 | else
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141 | BX_PANIC("Could not read from the boot medium! System halted.\n");
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142 | }
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143 | }
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144 |
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145 | //--------------------------------------------------------------------------
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146 | // print_cdromboot_failure
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147 | // displays the reason why boot failed
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148 | //--------------------------------------------------------------------------
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149 | void print_cdromboot_failure(uint16_t code)
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150 | {
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151 | BX_INFO("CDROM boot failure code : %04x\n",code);
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152 | return;
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153 | }
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154 |
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155 | // returns bootsegment in ax, drive in bl
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156 | uint32_t BIOSCALL int19_function(uint8_t bseqnr)
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157 | {
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158 | //@todo: common code for getting the EBDA segment
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159 | uint16_t ebda_seg=read_word(0x0040,0x000E);
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160 | uint16_t bootseq;
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161 | uint8_t bootdrv;
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162 | uint8_t bootcd;
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163 | uint8_t bootlan;
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164 | uint8_t bootchk;
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165 | uint16_t bootseg;
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166 | uint16_t status;
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167 | uint8_t lastdrive=0;
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168 |
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169 | // if BX_ELTORITO_BOOT is not defined, old behavior
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170 | // check bit 5 in CMOS reg 0x2d. load either 0x00 or 0x80 into DL
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171 | // in preparation for the initial INT 13h (0=floppy A:, 0x80=C:)
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172 | // 0: system boot sequence, first drive C: then A:
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173 | // 1: system boot sequence, first drive A: then C:
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174 | // else BX_ELTORITO_BOOT is defined
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175 | // CMOS regs 0x3D and 0x38 contain the boot sequence:
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176 | // CMOS reg 0x3D & 0x0f : 1st boot device
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177 | // CMOS reg 0x3D & 0xf0 : 2nd boot device
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178 | // CMOS reg 0x38 & 0xf0 : 3rd boot device
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179 | // CMOS reg 0x3C & 0x0f : 4th boot device
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180 | // boot device codes:
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181 | // 0x00 : not defined
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182 | // 0x01 : first floppy
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183 | // 0x02 : first harddrive
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184 | // 0x03 : first cdrom
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185 | // 0x04 : local area network
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186 | // else : boot failure
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187 |
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188 | // Get the boot sequence
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189 | #if BX_ELTORITO_BOOT
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190 | bootseq=inb_cmos(0x3d);
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191 | bootseq|=((inb_cmos(0x38) & 0xf0) << 4);
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192 | bootseq|=((inb_cmos(0x3c) & 0x0f) << 12);
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193 | if (read_byte(ebda_seg, (uint16_t)&EbdaData->uForceBootDevice))
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194 | bootseq = read_byte(ebda_seg, (uint16_t)&EbdaData->uForceBootDevice);
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195 | /* Boot delay hack. */
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196 | if (bseqnr == 1)
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197 | delay_boot((inb_cmos(0x3c) & 0xf0) >> 4); /* Implemented in logo.c */
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198 |
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199 | if (bseqnr==2) bootseq >>= 4;
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200 | if (bseqnr==3) bootseq >>= 8;
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201 | if (bseqnr==4) bootseq >>= 12;
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202 | if (bootseq<0x10) lastdrive = 1;
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203 | bootdrv=0x00; bootcd=0;
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204 | bootlan=0;
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205 | BX_INFO("Boot : bseqnr=%d, bootseq=%x\r\n",bseqnr, bootseq);
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206 |
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207 | switch(bootseq & 0x0f) {
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208 | case 0x01:
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209 | bootdrv=0x00;
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210 | bootcd=0;
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211 | break;
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212 | case 0x02:
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213 | {
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214 | // Get the Boot drive.
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215 | uint8_t boot_drive = read_byte(ebda_seg, (uint16_t)&EbdaData->uForceBootDrive);
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216 |
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217 | bootdrv = boot_drive + 0x80;
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218 | bootcd=0;
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219 | break;
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220 | }
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221 | case 0x03:
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222 | bootdrv=0x00;
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223 | bootcd=1;
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224 | break;
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225 | case 0x04: bootlan=1; break;
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226 | default: return 0x00000000;
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227 | }
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228 | #else
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229 | bootseq=inb_cmos(0x2d);
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230 |
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231 | if (bseqnr==2) {
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232 | bootseq ^= 0x20;
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233 | lastdrive = 1;
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234 | }
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235 | bootdrv=0x00; bootcd=0;
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236 | if((bootseq&0x20)==0) bootdrv=0x80;
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237 | #endif // BX_ELTORITO_BOOT
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238 |
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239 | #if BX_ELTORITO_BOOT
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240 | // We have to boot from cd
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241 | if (bootcd != 0) {
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242 | status = cdrom_boot();
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243 |
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244 | // If failure
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245 | if ( (status & 0x00ff) !=0 ) {
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246 | print_cdromboot_failure(status);
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247 | print_boot_failure(bootcd, bootlan, bootdrv, 1, lastdrive);
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248 | return 0x00000000;
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249 | }
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250 |
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251 | bootseg = read_word(ebda_seg,(uint16_t)&EbdaData->cdemu.load_segment);
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252 | bootdrv = (uint8_t)(status>>8);
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253 | }
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254 |
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255 | #endif // BX_ELTORITO_BOOT
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256 |
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257 | // Check for boot from LAN first
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258 | if (bootlan == 1) {
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259 | uint8_t __far *fplan;
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260 |
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261 | fplan = MK_FP(VBOX_LANBOOT_SEG, 0);
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262 | if (*(uint16_t __far *)fplan == 0xaa55) {
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263 | pnp_exp_t __far *pnps;
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264 | uint32_t manuf;
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265 | void (__far *netboot_entry)(void);
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266 |
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267 | // This is NOT a generic PnP implementation, but an Etherboot-specific hack.
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268 | pnps = (void __far *)(fplan + *(uint16_t __far *)(fplan + 0x1a));
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269 | if (pnps->sig == 0x506e5024/* '$PnP' */) {
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270 | // Found PnP signature
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271 | manuf = *(uint32_t __far *)(fplan + pnps->mfg_string);
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272 | if (manuf == 0x65687445/* 'Ethe' */) {
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273 | // Found Etherboot ROM
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274 | print_boot_device(bootcd, bootlan, bootdrv);
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275 | netboot_entry = (void __far *)(fplan + 6);
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276 | netboot_entry();
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277 | }
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278 | else
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279 | {
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280 | //Found Normal Pnp ROM
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281 | print_boot_device(bootcd, bootlan, bootdrv);
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282 | int_enable(); /* Disabled as we were invoked via INT instruction. */
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283 | netboot_entry = (void __far *)(fplan + pnps->bev);
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284 | netboot_entry();
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285 | }
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286 | }
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287 | }
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288 |
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289 | // boot from LAN will not return if successful.
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290 | print_boot_failure(bootcd, bootlan, bootdrv, 1, lastdrive);
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291 | return 0x00000000;
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292 | }
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293 |
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294 | // We have to boot from harddisk or floppy
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295 | if (bootcd == 0 && bootlan == 0) {
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296 | bootseg=0x07c0;
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297 |
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298 | status = read_boot_sec(bootdrv,bootseg);
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299 | if (status != 0) {
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300 | print_boot_failure(bootcd, bootlan, bootdrv, 1, lastdrive);
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301 | return 0x00000000;
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302 | }
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303 | }
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304 |
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305 | // There is *no* requirement whatsoever for a valid floppy boot sector
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306 | // to have a 55AAh signature. UNIX boot floppies typically have no such
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307 | // signature. In general, it is impossible to tell a valid bootsector
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308 | // from an invalid one.
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309 | // NB: It is somewhat common for failed OS installs to have the
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310 | // 0x55AA signature and a valid partition table but zeros in the
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311 | // rest of the boot sector. We do a quick check by comparing the first
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312 | // two words of boot sector; if identical, the boot sector is
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313 | // extremely unlikely to be valid.
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314 | if (bootdrv != 0) bootchk = 0;
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315 | else bootchk = 1; /* disable 0x55AA signature check on drive A: */
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316 |
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317 | #if BX_ELTORITO_BOOT
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318 | // if boot from cd, no signature check
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319 | if (bootcd != 0)
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320 | bootchk = 1;
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321 | #endif // BX_ELTORITO_BOOT
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322 |
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323 | if (read_word(bootseg,0) == read_word(bootseg,2)
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324 | || (bootchk == 0 && read_word(bootseg,0x1fe) != 0xaa55))
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325 | {
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326 | print_boot_failure(bootcd, bootlan, bootdrv, 0, lastdrive);
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327 | return 0x00000000;
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328 | }
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329 |
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330 | #if BX_ELTORITO_BOOT
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331 | // Print out the boot string
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332 | print_boot_device(bootcd, bootlan, bootdrv);
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333 | #else // BX_ELTORITO_BOOT
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334 | print_boot_device(0, bootlan, bootdrv);
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335 | #endif // BX_ELTORITO_BOOT
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336 |
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337 | // return the boot segment
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338 | return (((uint32_t)bootdrv) << 16) + bootseg;
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339 | }
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340 |
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