| 1 | /*
|
|---|
| 2 | * Copyright (C) 2006-2016 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 | *
|
|---|
| 13 | * This code is based on:
|
|---|
| 14 | *
|
|---|
| 15 | * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
|
|---|
| 16 | *
|
|---|
| 17 | * Copyright (C) 2002 MandrakeSoft S.A.
|
|---|
| 18 | *
|
|---|
| 19 | * MandrakeSoft S.A.
|
|---|
| 20 | * 43, rue d'Aboukir
|
|---|
| 21 | * 75002 Paris - France
|
|---|
| 22 | * http://www.linux-mandrake.com/
|
|---|
| 23 | * http://www.mandrakesoft.com/
|
|---|
| 24 | *
|
|---|
| 25 | * This library is free software; you can redistribute it and/or
|
|---|
| 26 | * modify it under the terms of the GNU Lesser General Public
|
|---|
| 27 | * License as published by the Free Software Foundation; either
|
|---|
| 28 | * version 2 of the License, or (at your option) any later version.
|
|---|
| 29 | *
|
|---|
| 30 | * This library is distributed in the hope that it will be useful,
|
|---|
| 31 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 33 | * Lesser General Public License for more details.
|
|---|
| 34 | *
|
|---|
| 35 | * You should have received a copy of the GNU Lesser General Public
|
|---|
| 36 | * License along with this library; if not, write to the Free Software
|
|---|
| 37 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|---|
| 38 | *
|
|---|
| 39 | */
|
|---|
| 40 |
|
|---|
| 41 |
|
|---|
| 42 | #include <stdint.h>
|
|---|
| 43 | #include <string.h>
|
|---|
| 44 | #include "inlines.h"
|
|---|
| 45 | #include "biosint.h"
|
|---|
| 46 | #include "ebda.h"
|
|---|
| 47 |
|
|---|
| 48 | /* Sanity check the LAN boot segment definition. */
|
|---|
| 49 | #if VBOX_LANBOOT_SEG < 0xA000
|
|---|
| 50 | #error VBOX_LANBOOT_SEG incorrect!
|
|---|
| 51 | #endif
|
|---|
| 52 |
|
|---|
| 53 | /* PnP header used with LAN boot ROMs. */
|
|---|
| 54 | typedef struct {
|
|---|
| 55 | uint32_t sig;
|
|---|
| 56 | uint8_t revision;
|
|---|
| 57 | uint8_t length;
|
|---|
| 58 | uint16_t next_s;
|
|---|
| 59 | uint8_t pad1;
|
|---|
| 60 | uint8_t checksum;
|
|---|
| 61 | uint32_t dev_id;
|
|---|
| 62 | uint16_t mfg_string;
|
|---|
| 63 | uint16_t prod_string;
|
|---|
| 64 | uint8_t base_class;
|
|---|
| 65 | uint8_t subclass;
|
|---|
| 66 | uint8_t interface;
|
|---|
| 67 | uint8_t dev_ind;
|
|---|
| 68 | uint16_t boot_code;
|
|---|
| 69 | uint16_t dv;
|
|---|
| 70 | uint16_t bev;
|
|---|
| 71 | uint16_t pad2;
|
|---|
| 72 | uint16_t sriv;
|
|---|
| 73 | } pnp_exp_t;
|
|---|
| 74 |
|
|---|
| 75 |
|
|---|
| 76 | int read_boot_sec(uint8_t bootdrv, uint16_t segment);
|
|---|
| 77 | #pragma aux read_boot_sec = \
|
|---|
| 78 | "mov ax,0201h" \
|
|---|
| 79 | "mov dh,0" \
|
|---|
| 80 | "mov cx,1" \
|
|---|
| 81 | "xor bx,bx" \
|
|---|
| 82 | "int 13h" \
|
|---|
| 83 | "mov ax,0" \
|
|---|
| 84 | "sbb ax,0" \
|
|---|
| 85 | parm [dl] [es] modify [ax bx cx dx];
|
|---|
| 86 |
|
|---|
| 87 | //--------------------------------------------------------------------------
|
|---|
| 88 | // print_boot_device
|
|---|
| 89 | // displays the boot device
|
|---|
| 90 | //--------------------------------------------------------------------------
|
|---|
| 91 |
|
|---|
| 92 | static const char drivetypes[][10]={"Floppy","Hard Disk","CD-ROM","LAN"};
|
|---|
| 93 |
|
|---|
| 94 | //@todo: pass inputs as bit flags rather than bytes?
|
|---|
| 95 | void print_boot_device(uint8_t cdboot, uint8_t lanboot, uint8_t drive)
|
|---|
| 96 | {
|
|---|
| 97 | int i;
|
|---|
| 98 |
|
|---|
| 99 | // cdboot contains 0 if lan/floppy/harddisk, 1 otherwise
|
|---|
| 100 | // lanboot contains 0 if floppy/harddisk, 1 otherwise
|
|---|
| 101 | // drive contains real/emulated boot drive
|
|---|
| 102 |
|
|---|
| 103 | if(cdboot)i=2; // CD-Rom
|
|---|
| 104 | else if(lanboot)i=3; // LAN
|
|---|
| 105 | else if((drive&0x0080)==0x00)i=0; // Floppy
|
|---|
| 106 | else if((drive&0x0080)==0x80)i=1; // Hard drive
|
|---|
| 107 | else return;
|
|---|
| 108 |
|
|---|
| 109 | BX_INFO("Booting from %s...\n",drivetypes[i]);
|
|---|
| 110 | }
|
|---|
| 111 |
|
|---|
| 112 | //--------------------------------------------------------------------------
|
|---|
| 113 | // print_boot_failure
|
|---|
| 114 | // displays the reason why boot failed
|
|---|
| 115 | //--------------------------------------------------------------------------
|
|---|
| 116 | //@todo: pass inputs as bit flags rather than bytes?
|
|---|
| 117 | void print_boot_failure(uint8_t cdboot, uint8_t lanboot, uint8_t drive,
|
|---|
| 118 | uint8_t reason, uint8_t lastdrive)
|
|---|
| 119 | {
|
|---|
| 120 | uint16_t drivenum = drive&0x7f;
|
|---|
| 121 |
|
|---|
| 122 | // cdboot: 1 if boot from cd, 0 otherwise
|
|---|
| 123 | // lanboot: 1 if boot from lan, 0 otherwise
|
|---|
| 124 | // drive : drive number
|
|---|
| 125 | // reason: 0 signature check failed, 1 read error
|
|---|
| 126 | // lastdrive: 1 boot drive is the last one in boot sequence
|
|---|
| 127 |
|
|---|
| 128 | if (cdboot)
|
|---|
| 129 | BX_INFO("Boot from %s failed\n",drivetypes[2]);
|
|---|
| 130 | else if (lanboot)
|
|---|
| 131 | BX_INFO("Boot from %s failed\n",drivetypes[3]);
|
|---|
| 132 | else if (drive & 0x80)
|
|---|
| 133 | BX_INFO("Boot from %s %d failed\n", drivetypes[1],drivenum);
|
|---|
| 134 | else
|
|---|
| 135 | BX_INFO("Boot from %s %d failed\n", drivetypes[0],drivenum);
|
|---|
| 136 |
|
|---|
| 137 | if (lastdrive==1) {
|
|---|
| 138 | if (reason==0)
|
|---|
| 139 | BX_PANIC("No bootable medium found! System halted.\n");
|
|---|
| 140 | else
|
|---|
| 141 | BX_PANIC("Could not read from the boot medium! System halted.\n");
|
|---|
| 142 | }
|
|---|
| 143 | }
|
|---|
| 144 |
|
|---|
| 145 | //--------------------------------------------------------------------------
|
|---|
| 146 | // print_cdromboot_failure
|
|---|
| 147 | // displays the reason why boot failed
|
|---|
| 148 | //--------------------------------------------------------------------------
|
|---|
| 149 | void print_cdromboot_failure(uint16_t code)
|
|---|
| 150 | {
|
|---|
| 151 | BX_INFO("CDROM boot failure code : %04x\n",code);
|
|---|
| 152 | return;
|
|---|
| 153 | }
|
|---|
| 154 |
|
|---|
| 155 | // returns bootsegment in ax, drive in bl
|
|---|
| 156 | uint32_t BIOSCALL int19_function(uint8_t bseqnr)
|
|---|
| 157 | {
|
|---|
| 158 | //@todo: common code for getting the EBDA segment
|
|---|
| 159 | uint16_t ebda_seg=read_word(0x0040,0x000E);
|
|---|
| 160 | uint16_t bootseq;
|
|---|
| 161 | uint8_t bootdrv;
|
|---|
| 162 | uint8_t bootcd;
|
|---|
| 163 | uint8_t bootlan;
|
|---|
| 164 | uint8_t bootchk;
|
|---|
| 165 | uint16_t bootseg;
|
|---|
| 166 | uint16_t status;
|
|---|
| 167 | uint8_t lastdrive=0;
|
|---|
| 168 |
|
|---|
| 169 | // if BX_ELTORITO_BOOT is not defined, old behavior
|
|---|
| 170 | // check bit 5 in CMOS reg 0x2d. load either 0x00 or 0x80 into DL
|
|---|
| 171 | // in preparation for the initial INT 13h (0=floppy A:, 0x80=C:)
|
|---|
| 172 | // 0: system boot sequence, first drive C: then A:
|
|---|
| 173 | // 1: system boot sequence, first drive A: then C:
|
|---|
| 174 | // else BX_ELTORITO_BOOT is defined
|
|---|
| 175 | // CMOS regs 0x3D and 0x38 contain the boot sequence:
|
|---|
| 176 | // CMOS reg 0x3D & 0x0f : 1st boot device
|
|---|
| 177 | // CMOS reg 0x3D & 0xf0 : 2nd boot device
|
|---|
| 178 | // CMOS reg 0x38 & 0xf0 : 3rd boot device
|
|---|
| 179 | // CMOS reg 0x3C & 0x0f : 4th boot device
|
|---|
| 180 | // boot device codes:
|
|---|
| 181 | // 0x00 : not defined
|
|---|
| 182 | // 0x01 : first floppy
|
|---|
| 183 | // 0x02 : first harddrive
|
|---|
| 184 | // 0x03 : first cdrom
|
|---|
| 185 | // 0x04 : local area network
|
|---|
| 186 | // else : boot failure
|
|---|
| 187 |
|
|---|
| 188 | // Get the boot sequence
|
|---|
| 189 | #if BX_ELTORITO_BOOT
|
|---|
| 190 | bootseq=inb_cmos(0x3d);
|
|---|
| 191 | bootseq|=((inb_cmos(0x38) & 0xf0) << 4);
|
|---|
| 192 | bootseq|=((inb_cmos(0x3c) & 0x0f) << 12);
|
|---|
| 193 | if (read_byte(ebda_seg, (uint16_t)&EbdaData->uForceBootDevice))
|
|---|
| 194 | bootseq = read_byte(ebda_seg, (uint16_t)&EbdaData->uForceBootDevice);
|
|---|
| 195 | /* Boot delay hack. */
|
|---|
| 196 | if (bseqnr == 1)
|
|---|
| 197 | delay_boot((inb_cmos(0x3c) & 0xf0) >> 4); /* Implemented in logo.c */
|
|---|
| 198 |
|
|---|
| 199 | if (bseqnr==2) bootseq >>= 4;
|
|---|
| 200 | if (bseqnr==3) bootseq >>= 8;
|
|---|
| 201 | if (bseqnr==4) bootseq >>= 12;
|
|---|
| 202 | if (bootseq<0x10) lastdrive = 1;
|
|---|
| 203 | bootdrv=0x00; bootcd=0;
|
|---|
| 204 | bootlan=0;
|
|---|
| 205 | BX_INFO("Boot : bseqnr=%d, bootseq=%x\r\n",bseqnr, bootseq);
|
|---|
| 206 |
|
|---|
| 207 | switch(bootseq & 0x0f) {
|
|---|
| 208 | case 0x01:
|
|---|
| 209 | bootdrv=0x00;
|
|---|
| 210 | bootcd=0;
|
|---|
| 211 | break;
|
|---|
| 212 | case 0x02:
|
|---|
| 213 | {
|
|---|
| 214 | // Get the Boot drive.
|
|---|
| 215 | uint8_t boot_drive = read_byte(ebda_seg, (uint16_t)&EbdaData->uForceBootDrive);
|
|---|
| 216 |
|
|---|
| 217 | bootdrv = boot_drive + 0x80;
|
|---|
| 218 | bootcd=0;
|
|---|
| 219 | break;
|
|---|
| 220 | }
|
|---|
| 221 | case 0x03:
|
|---|
| 222 | bootdrv=0x00;
|
|---|
| 223 | bootcd=1;
|
|---|
| 224 | break;
|
|---|
| 225 | case 0x04: bootlan=1; break;
|
|---|
| 226 | default: return 0x00000000;
|
|---|
| 227 | }
|
|---|
| 228 | #else
|
|---|
| 229 | bootseq=inb_cmos(0x2d);
|
|---|
| 230 |
|
|---|
| 231 | if (bseqnr==2) {
|
|---|
| 232 | bootseq ^= 0x20;
|
|---|
| 233 | lastdrive = 1;
|
|---|
| 234 | }
|
|---|
| 235 | bootdrv=0x00; bootcd=0;
|
|---|
| 236 | if((bootseq&0x20)==0) bootdrv=0x80;
|
|---|
| 237 | #endif // BX_ELTORITO_BOOT
|
|---|
| 238 |
|
|---|
| 239 | #if BX_ELTORITO_BOOT
|
|---|
| 240 | // We have to boot from cd
|
|---|
| 241 | if (bootcd != 0) {
|
|---|
| 242 | status = cdrom_boot();
|
|---|
| 243 |
|
|---|
| 244 | // If failure
|
|---|
| 245 | if ( (status & 0x00ff) !=0 ) {
|
|---|
| 246 | print_cdromboot_failure(status);
|
|---|
| 247 | print_boot_failure(bootcd, bootlan, bootdrv, 1, lastdrive);
|
|---|
| 248 | return 0x00000000;
|
|---|
| 249 | }
|
|---|
| 250 |
|
|---|
| 251 | bootseg = read_word(ebda_seg,(uint16_t)&EbdaData->cdemu.load_segment);
|
|---|
| 252 | bootdrv = (uint8_t)(status>>8);
|
|---|
| 253 | }
|
|---|
| 254 |
|
|---|
| 255 | #endif // BX_ELTORITO_BOOT
|
|---|
| 256 |
|
|---|
| 257 | // Check for boot from LAN first
|
|---|
| 258 | if (bootlan == 1) {
|
|---|
| 259 | uint8_t __far *fplan;
|
|---|
| 260 |
|
|---|
| 261 | fplan = MK_FP(VBOX_LANBOOT_SEG, 0);
|
|---|
| 262 | if (*(uint16_t __far *)fplan == 0xaa55) {
|
|---|
| 263 | pnp_exp_t __far *pnps;
|
|---|
| 264 | uint32_t manuf;
|
|---|
| 265 | void (__far *netboot_entry)(void);
|
|---|
| 266 |
|
|---|
| 267 | // This is NOT a generic PnP implementation, but an Etherboot-specific hack.
|
|---|
| 268 | pnps = (void __far *)(fplan + *(uint16_t __far *)(fplan + 0x1a));
|
|---|
| 269 | if (pnps->sig == 0x506e5024/* '$PnP' */) {
|
|---|
| 270 | // Found PnP signature
|
|---|
| 271 | manuf = *(uint32_t __far *)(fplan + pnps->mfg_string);
|
|---|
| 272 | if (manuf == 0x65687445/* 'Ethe' */) {
|
|---|
| 273 | // Found Etherboot ROM
|
|---|
| 274 | print_boot_device(bootcd, bootlan, bootdrv);
|
|---|
| 275 | netboot_entry = (void __far *)(fplan + 6);
|
|---|
| 276 | netboot_entry();
|
|---|
| 277 | }
|
|---|
| 278 | else
|
|---|
| 279 | {
|
|---|
| 280 | //Found Normal Pnp ROM
|
|---|
| 281 | print_boot_device(bootcd, bootlan, bootdrv);
|
|---|
| 282 | int_enable(); /* Disabled as we were invoked via INT instruction. */
|
|---|
| 283 | netboot_entry = (void __far *)(fplan + pnps->bev);
|
|---|
| 284 | netboot_entry();
|
|---|
| 285 | }
|
|---|
| 286 | }
|
|---|
| 287 | }
|
|---|
| 288 |
|
|---|
| 289 | // boot from LAN will not return if successful.
|
|---|
| 290 | print_boot_failure(bootcd, bootlan, bootdrv, 1, lastdrive);
|
|---|
| 291 | return 0x00000000;
|
|---|
| 292 | }
|
|---|
| 293 |
|
|---|
| 294 | // We have to boot from harddisk or floppy
|
|---|
| 295 | if (bootcd == 0 && bootlan == 0) {
|
|---|
| 296 | bootseg=0x07c0;
|
|---|
| 297 |
|
|---|
| 298 | status = read_boot_sec(bootdrv,bootseg);
|
|---|
| 299 | if (status != 0) {
|
|---|
| 300 | print_boot_failure(bootcd, bootlan, bootdrv, 1, lastdrive);
|
|---|
| 301 | return 0x00000000;
|
|---|
| 302 | }
|
|---|
| 303 | }
|
|---|
| 304 |
|
|---|
| 305 | // There is *no* requirement whatsoever for a valid floppy boot sector
|
|---|
| 306 | // to have a 55AAh signature. UNIX boot floppies typically have no such
|
|---|
| 307 | // signature. In general, it is impossible to tell a valid bootsector
|
|---|
| 308 | // from an invalid one.
|
|---|
| 309 | // NB: It is somewhat common for failed OS installs to have the
|
|---|
| 310 | // 0x55AA signature and a valid partition table but zeros in the
|
|---|
| 311 | // rest of the boot sector. We do a quick check by comparing the first
|
|---|
| 312 | // two words of boot sector; if identical, the boot sector is
|
|---|
| 313 | // extremely unlikely to be valid.
|
|---|
| 314 | if (bootdrv != 0) bootchk = 0;
|
|---|
| 315 | else bootchk = 1; /* disable 0x55AA signature check on drive A: */
|
|---|
| 316 |
|
|---|
| 317 | #if BX_ELTORITO_BOOT
|
|---|
| 318 | // if boot from cd, no signature check
|
|---|
| 319 | if (bootcd != 0)
|
|---|
| 320 | bootchk = 1;
|
|---|
| 321 | #endif // BX_ELTORITO_BOOT
|
|---|
| 322 |
|
|---|
| 323 | if (read_word(bootseg,0) == read_word(bootseg,2)
|
|---|
| 324 | || (bootchk == 0 && read_word(bootseg,0x1fe) != 0xaa55))
|
|---|
| 325 | {
|
|---|
| 326 | print_boot_failure(bootcd, bootlan, bootdrv, 0, lastdrive);
|
|---|
| 327 | return 0x00000000;
|
|---|
| 328 | }
|
|---|
| 329 |
|
|---|
| 330 | #if BX_ELTORITO_BOOT
|
|---|
| 331 | // Print out the boot string
|
|---|
| 332 | print_boot_device(bootcd, bootlan, bootdrv);
|
|---|
| 333 | #else // BX_ELTORITO_BOOT
|
|---|
| 334 | print_boot_device(0, bootlan, bootdrv);
|
|---|
| 335 | #endif // BX_ELTORITO_BOOT
|
|---|
| 336 |
|
|---|
| 337 | // return the boot segment
|
|---|
| 338 | return (((uint32_t)bootdrv) << 16) + bootseg;
|
|---|
| 339 | }
|
|---|
| 340 |
|
|---|
