1 ; **************************************************************************** 2 ; mbrestor.s (MBRESTOR.COM) - TRDOS 386 Harddisk MBR Restore Utility 3 ; (for MSDOS/WINDOWS) 4 ; **************************************************************************** 5 ; Last Update: 11/10/2020 6 ; ---------------------------------------------------------------------------- 7 ; Beginning: 10/10/2020 8 ; ---------------------------------------------------------------------------- 9 ; Assembler: NASM version 2.15 10 ; ---------------------------------------------------------------------------- 11 ; Turkish Rational DOS 12 ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016) 13 ; ---------------------------------------------------------------------------- 14 ; Purpose: 15 ; To restore masterboot sector (MBR) from a file after a modification. 16 ; (MBSAVE.COM is used to save masterboot sector before using MBRESTOR) 17 ; **************************************************************************** 18 ; nasm mbrestor.s -l mbrestor.lst -o MBRESTOR.COM 19 ; ---------------------------------------------------------------------------- 20 ; Derived from: mbsave.s & bsrestor.s by Erdogan Tan, 10/10/2020 21 22 ; DTA (PSP+80h= Offset 128) 23 DTA_Attrib equ 149 ; PDP+21 24 DTA_Time equ 150 ; PSP+22 25 DTA_Date equ 152 ; PSP 24 26 DTA_FileSize equ 154 ; PSP + 26 27 DTA_FileName equ 158 ; PSP + 30 28 29 ; Masterboot / Partition Table at Beginning+1BEh 30 ptBootable equ 0 31 ptBeginHead equ 1 32 ptBeginSector equ 2 33 ptBeginCylinder equ 3 34 ptFileSystemID equ 4 35 ptEndHead equ 5 36 ptEndSector equ 6 37 ptEndCylinder equ 7 38 ptStartSector equ 8 39 ptSectors equ 12 40 41 ; BIOS INT 13h Extensions (LBA extensions) 42 ; Just After DP Data (DPDiskNumber+) 43 DAP_PacketSize equ 10h ; If extensions present, this byte will be >=10h 44 DAP_Reserved1 equ 11h ; Reserved Byte 45 DAP_NumOfBlocks equ 12h ; Value of this byte must be 0 to 127 46 DAP_Reserved2 equ 13h ; Reserved Byte 47 DAP_Destination equ 14h ; Address of Transfer Buffer as SEGMENT:OFFSET 48 DAP_LBA_Address equ 18h ; LBA=(C1*H0+H1)*S0+S1-1 49 ; C1= Selected Cylinder Number 50 ; H0= Number Of Heads (Maximum Head Number + 1) 51 ; H1= Selected Head Number 52 ; S0= Maximum Sector Number 53 ; S1= Selected Sector Number 54 ; QUAD WORD 55 ; DAP_Flat_Destination equ 20h ; 64 bit address, if value in 4h is FFFF:FFFFh 56 ; QUAD WORD (Also, value in 0h must be 18h) 57 ; TR-DOS will not use 64 bit Flat Address 58 59 pTableOffset equ 1BEh ; 446 60 61 62 ; Known partition types 63 64 ;FileSys_Names: ; 2003-2017 65 ;; (Valid FileSystems for TRDOS 386, SINGLIX, RETRO UNIX OS projects in 2017) 66 FS_FAT12 equ 1 ; 01h = FAT12 67 FS_XENIX equ 2 ; 02h , XENIX System V root 68 FS_XENIX_USR equ 3 ; 03h , XENIX System V user 69 FS_FAT16 equ 4 ; 04h = FAT16 < 32MB 70 FS_EXT_CHS equ 5 ; 05h = Extended DOS Partition 71 FS_FAT16_BIG equ 6 ; 06h = FAT16 > 32MB, CHS mode 72 FS_NTFS equ 7 ; 07h , WINDOWS NTFS Partition 73 FS_FAT32_CHS equ 11 ; 0Bh = FAT32, CHS mode 74 FS_FAT32_LBA equ 12 ; 0Ch = FAT32, LBA mode 75 FS_FAT16_LBA equ 14 ; 0Eh = FAT16, LBA mode 76 FS_EXT_LBA equ 15 ; 0Fh = Extented Partition, LBA mode 77 FS_UNIX_SYSV equ 99 ; 63h , SCO UNIX, UNIXWARE, OPENSERVER 78 FS_RETROUNIX equ 113 ; 71h , Retro UNIX 386 v2 Partition 79 FS_UNIX_V7 equ 114 ; 72h , UNIX v7 x86 Partition 80 FS_LINUXSWAP equ 139 ; 82h , LINUX SWAP Partition 81 FS_LINUX equ 131 ; 83h , LINUX NATIVE (ext2) Partition 82 FS_LINUXEXT equ 133 ; 85h , LINUX EXTENDED Partition 83 FS_TRDD equ 160 ; A0h , (Random Data Disk) LBA 84 FS_TRFS equ 161 ; A1h , (32 bit, 512 bytes per sector) 85 86 [BITS 16] 87 [ORG 100h] 88 89 ;;cli 90 ;;cld 91 ;;push cs 92 ;;pop ss 93 ;;mov sp, 0FFFEh 94 ;;sti 95 ; 96 ;;mov bx, SizeOfFile+100 97 ; 98 ;mov bx, bss_end 99 ; 100 ;add bx, 15 101 ;shr bx, 1 102 ;shr bx, 1 103 ;shr bx, 1 104 ;shr bx, 1 105 ;mov ah, 4Ah ; modify memory allocation 106 ;;push cs 107 ;;pop es 108 ;int 21h 109 110 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 111 ; clear BSS 112 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 113 114 ;mov cx, bss_clear_end 115 ; 116 ;mov di, bss_start 117 ;sub cx, di 118 ;;inc cx 119 ;shr cx, 1 120 ;xor ax, ax 121 ;rep stosw 122 123 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 124 ; get command arguments (command tail) 125 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 126 127 00000000 BE8000 mov si, 80h ; PSP command tail 128 00000003 AC lodsb 129 00000004 08C0 or al, al ; command tail length 130 00000006 7449 jz short _06 ; jump if zero 131 _01: 132 00000008 AC lodsb 133 00000009 3C20 cmp al, ' ' ; is it SPACE ? 134 0000000B 74FB je short _01 135 0000000D 7242 jb short _06 136 137 0000000F C606[220E]61 mov byte [option], 'a' ; reset to all (code and pt) 138 139 ; check option character ("-") 140 00000014 3C2D cmp al, '-' 141 00000016 751F jne short _04 142 143 00000018 AC lodsb 144 00000019 C606[220E]63 mov byte [option], 'c' ; set to code 145 0000001E 3C63 cmp al, 'c' 146 00000020 7409 je short _02 147 00000022 3C74 cmp al, 't' 148 00000024 752B jne short _06 149 00000026 C606[220E]74 mov byte [option], 't' ; set to partition table 150 _02: 151 0000002B 803C20 cmp byte [si], ' ' ; space 152 0000002E 7521 jne short _06 153 _03: 154 00000030 AC lodsb 155 00000031 3C20 cmp al, 20h ; space 156 00000033 74FB je short _03 157 00000035 721A jb short _06 158 _04: 159 ; check disk name 160 161 00000037 3C68 cmp al, 'h' 162 00000039 7516 jne short _06 163 0000003B 803C64 cmp byte [si], 'd' 164 0000003E 7511 jne short _06 165 00000040 46 inc si 166 00000041 AC lodsb 167 00000042 3C30 cmp al, '0' 168 00000044 7406 je short _05 169 00000046 7209 jb short _06 170 00000048 3C33 cmp al, '3' 171 0000004A 7705 ja short _06 172 _05: 173 0000004C 803C20 cmp byte [si], ' ' 174 0000004F 7406 je short _07 175 _06: 176 00000051 BE[6203] mov si, TrDOS_Welcome 177 00000054 E93202 jmp _52 178 _07: 179 00000057 46 inc si 180 00000058 0450 add al, 80h - '0' 181 0000005A A2[6003] mov [DrvNum], al ; 80h .. 83h 182 _08: 183 0000005D AC lodsb 184 0000005E 3C20 cmp al, ' ' 185 00000060 74FB je short _08 186 00000062 72ED jb short _06 187 188 ; check backup file name 189 _09: 190 00000064 BF[1408] mov di, mbr_file_name 191 00000067 AA stosb 192 _10: 193 00000068 AC lodsb 194 ;cmp al, 0Dh ; ENTER (CR) key 195 00000069 3C20 cmp al, 20h ; ' ' 196 0000006B 760C jna short _11 197 0000006D AA stosb 198 0000006E 81FF[2008] cmp di, mbr_file_name + 12 199 00000072 72F4 jb short _10 200 00000074 803C20 cmp byte [si], 20h 201 00000077 7742 ja short _17 202 _11: 203 00000079 28C0 sub al, al 204 0000007B AA stosb 205 206 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 207 ; File name capitalization 208 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 209 210 0000007C BE[1408] mov si, mbr_file_name 211 0000007F 89F7 mov di, si 212 00000081 89F3 mov bx, si 213 _12: 214 00000083 AC lodsb 215 00000084 3C61 cmp al, 'a' 216 00000086 730D jnb short _14 217 00000088 20C0 and al, al 218 0000008A 7412 jz short _15 219 0000008C 3C2E cmp al, '.' 220 0000008E 7502 jne short _13 221 00000090 89FB mov bx, di ; dot position 222 _13: 223 00000092 AA stosb 224 00000093 EBEE jmp short _12 225 _14: 226 00000095 3C7A cmp al, 'z' 227 00000097 77F9 ja short _13 228 00000099 24DF and al, 0DFh ; NOT 32 229 0000009B AA stosb 230 0000009C EBE5 jmp short _12 231 _15: 232 0000009E 8805 mov [di], al 233 000000A0 4F dec di 234 000000A1 39FB cmp bx, di 235 000000A3 7316 jnb short _17 236 000000A5 29DF sub di, bx 237 000000A7 81EB[1408] sub bx, mbr_file_name 238 000000AB 83FF03 cmp di, 3 239 000000AE 7606 jna short _16 240 000000B0 21DB and bx, bx 241 000000B2 7507 jnz short _17 242 000000B4 EB0B jmp short _18 243 _16: 244 000000B6 83FB08 cmp bx, 8 245 000000B9 7606 jna short _18 246 _17: 247 000000BB BE[3C05] mov si, msg_inv_file_name 248 000000BE E9C801 jmp _52 249 250 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 251 ; Find masterboot record/sector (MBR) backup file 252 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 253 254 _18: 255 000000C1 BA[1408] mov dx, mbr_file_name 256 000000C4 B93F00 mov cx, 3Fh ; File Attributes 257 000000C7 B44E mov ah, 4Eh ; MS-DOS Function = Find First File 258 000000C9 CD21 int 21h 259 000000CB 7306 jnc short _19 260 261 ; mbr backup file not found in working/current directory 262 000000CD BE[2D06] mov si, msg_file_notfound 263 000000D0 E9B601 jmp _52 264 265 _19: 266 267 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 268 ; Check mbr backup file features 269 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 270 271 000000D3 BE9500 mov si, DTA_Attrib 272 000000D6 8A04 mov al, [si] 273 ;and al, 1Fh ; directory, volume label, system, hidden, read only 274 000000D8 241E and al, 1Eh ; directory, volume label, system, hidden 275 000000DA 75DF jnz short _17 276 000000DC BE9A00 mov si, DTA_FileSize 277 000000DF AD lodsw 278 000000E0 8B14 mov dx, [si] 279 000000E2 09C0 or ax, ax 280 000000E4 7413 jz short _20 ; zero file size (invalid backup file) 281 282 000000E6 21D2 and dx, dx 283 000000E8 750F jnz short _20 ; wrong file size (>1536 bytes) 284 285 000000EA 3D0002 cmp ax, 512 ; MBSAVE.COM 286 000000ED 7410 je short _21 ; correct file size (for masterboot sector) 287 288 000000EF 3D0004 cmp ax, 1024 ; BSSAVE.COM 289 000000F2 740B je short _21 ; correct file size (for MBR + FAT boot sector) 290 291 000000F4 3D0006 cmp ax, 1536 ; BSSAVE.COM 292 000000F7 7406 je short _21 ; correct file size (for MBR + FAT32 boot sectors) 293 294 ; invalid backup file ! 295 _20: 296 000000F9 BE[A206] mov si, msg_inv_backup_file 297 000000FC E98A01 jmp _52 298 299 _21: 300 301 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 302 ; Read masterboot sector (MBR) 303 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 304 305 000000FF BF0500 mov di, 5 306 307 ;mov ax, 0201h ; read disk 308 00000102 BB[220A] mov bx, MasterBootBuff ; location of masterboot code 309 310 00000105 B90100 mov cx, 1 ; cylinder = 0 311 ; sector = 1 312 00000108 B600 mov dh, 0 ; head = 0 313 0000010A 8A16[6003] mov dl, [DrvNum] ; drive number, 80h .. 83h 314 _22: 315 0000010E B80102 mov ax, 0201h 316 00000111 CD13 int 13h 317 00000113 730D jnc short _23 ; read masterboot sector, OK 318 319 ; reset hard disk(s) 320 00000115 30E4 xor ah, ah 321 ;mov dl, [drv] 322 00000117 CD13 int 13h 323 324 ;dec byte [RetryCount] 325 00000119 4F dec di 326 0000011A 75F2 jnz short _22 327 328 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 329 ; write disk error message and terminate 330 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 331 332 0000011C BE[6206] mov si, msg_disk_not_ready_error 333 0000011F E96701 jmp _52 334 335 _23: 336 337 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 338 ; Check MBR if it is valid and it contains a known partition 339 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 340 341 00000122 813E[200C]55AA cmp word [MBIDCode], 0AA55h 342 00000128 750E jne short _25 ; invalid MBR 343 344 ; check if MBR contains a known type of partition or not 345 ; (also check bootable partition indicator for 0 or 80h) 346 347 0000012A BE[E00B] mov si, MasterBootBuff+pTableOffset 348 _24: 349 0000012D BB[4C03] mov bx, known_partitions 350 00000130 B91300 mov cx, kpc-known_partitions 351 352 00000133 F6047F test byte [si], 7Fh 353 00000136 7407 jz short _26 ; valid indicator 354 _25: 355 ; invalid MBR ! MBR code and PT must be restored from file 356 ; (also if the PT does not contain a known partition type) 357 00000138 C606[220E]65 mov byte [option], 'e' 358 0000013D EB1C jmp short _29 359 _26: 360 0000013F 8A4404 mov al, [si+ptFileSystemID] 361 00000142 08C0 or al, al 362 00000144 740A jz short _28 363 _27: 364 00000146 3A07 cmp al, [bx] 365 00000148 7411 je short _29 366 0000014A 49 dec cx 367 0000014B 7403 jz short _28 368 0000014D 43 inc bx 369 0000014E EBF6 jmp short _27 370 _28: 371 00000150 81FE[200C] cmp si, MasterBootBuff+pTableOffset+64 372 00000154 73E2 jnb short _25 373 00000156 83C610 add si, 16 374 00000159 EBD2 jmp short _24 375 _29: 376 377 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 378 ; save the disk's MBR if it's partition table is valid 379 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 380 381 0000015B 803E[220E]65 cmp byte [option], 'e' ; invalid partition table ? 382 00000160 740B je short _30 ; yes (full restore is needed) 383 384 00000162 BE[220A] mov si, MasterBootBuff ; R/W Buffer 385 00000165 BF[2208] mov di, MBR ; Backup 386 00000168 B90001 mov cx, 256 387 0000016B F3A5 rep movsw 388 _30: 389 390 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 391 ; read MBR in the backup file and check it 392 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 393 394 0000016D B8003D mov ax, 3D00h ; open file for read 395 00000170 BA[1408] mov dx, mbr_file_name 396 00000173 CD21 int 21h 397 00000175 7214 jc short _32 398 _31: 399 ;mov [mbr_file_handle], ax 400 00000177 89C3 mov bx, ax 401 00000179 B90002 mov cx, 512 ; read masterboot sector (512 bytes) 402 ;mov ax, 3F00h ; read from file 403 0000017C B43F mov ah, 3Fh 404 0000017E BA[220A] mov dx, MasterBootBuff 405 00000181 CD21 int 21h 406 407 00000183 9C pushf 408 00000184 B43E mov ah, 3Eh ; close file 409 ;mov bx, [mbr_file_handle] 410 00000186 CD21 int 21h 411 00000188 9D popf 412 00000189 7306 jnc short _33 413 _32: 414 0000018B BE[4906] mov si, msg_file_read_error 415 0000018E E9F800 jmp _52 416 _33: 417 ; Check file's MBR 418 419 00000191 813E[200C]55AA cmp word [MBIDCode], 0AA55h 420 00000197 7406 je short _35 ; Valid MBR 421 _34: 422 ; invalid MBR ! 423 00000199 BE[ED06] mov si, msg_inv_file_mbr 424 0000019C E9EA00 jmp _52 425 _35: 426 ; check if MBR contains a known type of partition or not 427 ; (also check bootable partition indicator for 0 or 80h) 428 429 0000019F BE[E00B] mov si, MasterBootBuff+pTableOffset 430 _36: 431 000001A2 BB[4C03] mov bx, known_partitions 432 000001A5 B91300 mov cx, kpc-known_partitions 433 434 000001A8 F6047F test byte [si], 7Fh 435 000001AB 7406 jz short _38 ; valid indicator 436 _37: 437 ; invalid MBR 438 ; (MBR does not contain a known partition type) 439 000001AD BE[7E05] mov si, msg_kp_notfound 440 000001B0 E9D600 jmp _52 441 _38: 442 000001B3 8A4404 mov al, [si+ptFileSystemID] 443 000001B6 08C0 or al, al 444 000001B8 740A jz short _40 445 _39: 446 000001BA 3A07 cmp al, [bx] 447 000001BC 7411 je short _41 448 000001BE 49 dec cx 449 000001BF 7403 jz short _40 450 000001C1 43 inc bx 451 000001C2 EBF6 jmp short _39 452 _40: 453 000001C4 81FE[200C] cmp si, MasterBootBuff+pTableOffset+64 454 000001C8 73E3 jnb short _37 455 000001CA 83C610 add si, 16 456 000001CD EBD3 jmp short _36 457 _41: 458 459 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 460 ; check (present) active partition's boot sector 461 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 462 463 000001CF 803E[220E]63 cmp byte [option], 'c' ; MBR code only 464 000001D4 7429 je short _43 ; MBR code will be overwritten 465 466 000001D6 803E[220E]65 cmp byte [option], 'e' 467 ; Invalid MBR, will be overwritten 468 000001DB 7422 je short _43 469 470 000001DD BE[E009] mov si, MBR+pTableOffset 471 000001E0 E8EC00 call check_active_p_bs 472 000001E3 7205 jc short _42 473 474 000001E5 C606[6103]01 mov byte [oldpbs], 1 475 _42: 476 477 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 478 ; verify boot sector of the active partition (or dos partition) 479 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 480 481 000001EA BE[E00B] mov si, MasterBootBuff+pTableOffset 482 000001ED E8DF00 call check_active_p_bs 483 000001F0 730D jnc short _43 484 485 000001F2 803E[6103]01 cmp byte [oldpbs], 1 486 000001F7 7206 jb short _43 487 488 000001F9 BE[1807] mov si, msg_file_pbsv_error 489 000001FC E98A00 jmp _52 490 _43: 491 492 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 493 ; MBR overwrite question 494 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 495 496 000001FF BE[CA05] mov si, msg_overwrite_question 497 00000202 E8BC00 call print_msg 498 _44: 499 00000205 31C0 xor ax, ax 500 00000207 CD16 int 16h ; wait for keyboard command 501 00000209 3C79 cmp al, 'y' 502 0000020B 7419 je short _46 ; retry 503 0000020D 3C59 cmp al, 'Y' 504 0000020F 7415 je short _46 505 00000211 3C6E cmp al, 'n' 506 00000213 740C je short _45 ; exit 507 00000215 3C4E cmp al, 'N' 508 00000217 7408 je short _45 509 00000219 3C03 cmp al, 'C'-40h 510 0000021B 7464 je short _50 511 0000021D 3C1B cmp al, 27 512 0000021F 7568 jne short _52 513 _45: 514 00000221 BE[0006] mov si, _NO 515 00000224 EB63 jmp short _52 516 _46: 517 00000226 BE[FA05] mov si, _YES 518 00000229 E89500 call print_msg 519 520 0000022C BE[0506] mov si, msg_writing_mbr 521 0000022F E88F00 call print_msg 522 523 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 524 ; set masterboot buffer according to the selected option 525 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 526 527 00000232 A0[220E] mov al, [option] 528 529 00000235 3C61 cmp al, 'a' 530 00000237 7420 je short _48 531 532 00000239 3C65 cmp al, 'e' 533 0000023B 741C je short _48 534 535 0000023D 3C63 cmp al, 'c' 536 0000023F 750D jne short _47 537 538 ; [option] = 'c' ; restore MBR (bs loader) code only 539 ; (old partition table will not be overwritten) 540 00000241 BE[E009] mov si, MBR+pTableOffset 541 00000244 BF[E00B] mov di, MasterBootBuff+pTableOffset 542 00000247 B92000 mov cx, 32 543 0000024A F3A5 rep movsw 544 ;;mov word [MasterBootBuff+510], 0AA55h 545 0000024C EB0B jmp short _48 546 _47: 547 ; [option] = 't' ; restore partition table only 548 ; (old MBR code will not be overwritten) 549 0000024E BE[2208] mov si, MBR 550 00000251 BF[220A] mov di, MasterBootBuff 551 00000254 B9BE01 mov cx, pTableOffset ; 446 552 00000257 F3A4 rep movsb 553 ;mov word [MasterBootBuff+510], 0AA55h 554 _48: 555 556 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 557 ; Write masterboot sector to disk 558 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 559 560 00000259 BF0500 mov di, 5 561 562 ;mov ax, 0301h ; write disk 563 0000025C BB[220A] mov bx, MasterBootBuff ; masterboot buffer 564 565 0000025F B90100 mov cx, 1 ; cylinder = 0 566 ; sector = 1 567 00000262 B600 mov dh, 0 ; head = 0 568 00000264 8A16[6003] mov dl, [DrvNum] ; drive number, 80h .. 83h 569 _49: 570 00000268 B80103 mov ax, 0301h 571 0000026B CD13 int 13h 572 0000026D 7317 jnc short _51 ; write masterboot sector, OK 573 574 ; reset hard disk(s) 575 0000026F 30E4 xor ah, ah 576 ;mov dl, [drv] 577 00000271 CD13 int 13h 578 579 ;dec byte [RetryCount] 580 00000273 4F dec di 581 00000274 75F2 jnz short _49 582 583 ; disk write error 584 00000276 BE[2A06] mov si, CRLF 585 00000279 E84500 call print_msg 586 0000027C BE[8B06] mov si, msg_disk_write_error 587 0000027F EB08 jmp short _52 588 _50: 589 ; nothing to do ! 590 00000281 BE[2A06] mov si, CRLF 591 00000284 EB03 jmp short _52 592 _51: 593 ; disk (mbr) writing is OK. 594 00000286 BE[2606] mov si, msg_OK 595 _52: 596 00000289 E83500 call print_msg 597 598 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 599 ; Exit 600 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 601 602 0000028C B8004C mov ax, 4C00h ; terminate 603 0000028F CD21 int 21h 604 _53: 605 00000291 EBFE jmp short _53 606 607 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 608 ; LBA read (read one sector) 609 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 610 611 ;lba_read: 612 ; mov [rw], 42h 613 ; jmp short lba_rw 614 615 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 616 ; LBA write (write one sector) 617 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 618 619 ;lba_write: 620 ; mov byte [rw], 43h 621 ; jmp short lba_rw 622 623 lba_read: 624 lba_rw: 625 00000293 BF0500 mov di, 5 626 lba_rw_1: 627 ;pusha ; db 60h 628 00000296 60 db 60h 629 ;push 0 ; db 6Ah, 00h 630 00000297 6A00 db 6Ah, 0 631 ;push 0 ; db 6Ah, 00h 632 00000299 6A00 db 6Ah, 0 633 0000029B 52 push dx 634 0000029C 50 push ax 635 0000029D 06 push es 636 0000029E 53 push bx 637 ;push 1 ; db 6Ah, 01h 638 0000029F 6A01 db 6Ah, 01h 639 ;push 10h ; db 6Ah, 10h 640 000002A1 6A10 db 6Ah, 10h 641 642 000002A3 89E6 mov si, sp 643 000002A5 8A16[6003] mov dl, [DrvNum] 644 000002A9 30C0 xor al, al ; verify off (for LBA write) 645 lba_rw_2: 646 ;mov ah, [rw] ; LBA read/write 647 ;xor al, al ; verify off 648 000002AB B442 mov ah, 42h ; LBA read 649 000002AD CD13 int 13h 650 651 ;mov [error], ah 652 000002AF 730D jnc short lba_rw_3 653 654 000002B1 4F dec di 655 000002B2 740A jz short lba_rw_3 656 657 000002B4 30E4 xor ah, ah 658 ;mov dl, [DrvNum] 659 000002B6 CD13 int 13h ; BIOS Service func (ah) = 0 660 ; Reset disk system 661 662 ;mov word [si+2], 1 ; set r/w count to 1 again 663 000002B8 C6440201 mov byte [si+2], 1 664 665 000002BC EBED jmp short lba_rw_2 666 667 lba_rw_3: 668 ;popa 669 000002BE 61 db 61h 670 ;popa 671 000002BF 61 db 61h 672 673 _retn: 674 000002C0 C3 retn 675 676 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 677 ; print message 678 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 679 680 print_msg: 681 000002C1 AC lodsb ; Load byte at DS:SI to AL 682 000002C2 20C0 and al, al 683 000002C4 74FA jz short _retn 684 000002C6 B40E mov ah, 0Eh 685 000002C8 BB0700 mov bx, 07h 686 000002CB CD10 int 10h ; BIOS Service func ( ah ) = 0Eh 687 ; Write char as TTY 688 ; AL-char BH-page BL-color 689 000002CD EBF2 jmp short print_msg 690 691 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 692 ; check active partition's (or primary dos partition's) bs 693 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 694 695 check_active_p_bs: 696 ; si = partition table address 697 000002CF 89F5 mov bp, si 698 000002D1 83C530 add bp, 48 699 chk_a_pbs_next: 700 000002D4 8A4404 mov al, [si+ptFileSystemID] 701 702 000002D7 C606[230E]26 mov byte [bootsig], 38 ; FAT 16 & FAT 12 703 704 000002DC 3C06 cmp al, 06h 705 000002DE 7433 je short read_start_sector ; FAT 16 CHS (big) 706 000002E0 3C01 cmp al, 01h 707 000002E2 742F je short read_start_sector ; FAT 12 CHS (or LBA) 708 000002E4 3C04 cmp al, 04h 709 000002E6 742B je short read_start_sector ; FAT 16 CHS 710 000002E8 3C0E cmp al, 0Eh 711 000002EA 7427 je short read_start_sector ; FAT 16 LBA (windows) 712 713 000002EC C606[230E]42 mov byte [bootsig], 66 ; FAT 32 714 715 000002F1 3C0C cmp al, 0Ch 716 000002F3 741E je short read_start_sector ; FAT 32 LBA 717 000002F5 3C0B cmp al, 0Bh 718 000002F7 741A je short read_start_sector ; FAT 32 CHS 719 720 000002F9 C606[230E]00 mov byte [bootsig], 0 ; others 721 722 000002FE 803C80 cmp byte [si], 80h ; bootable (active) flag 723 00000301 7410 je short read_start_sector 724 725 00000303 3C05 cmp al, 05h 726 00000305 740C je short read_start_sector ; Extended DOS CHS 727 00000307 3C0F cmp al, 0Fh 728 00000309 7408 je short read_start_sector ; Extended DOS (windows) LBA 729 730 0000030B 83C610 add si, 16 731 0000030E 39F5 cmp bp, si 732 00000310 73C2 jnb short chk_a_pbs_next 733 734 ; cf = 1 735 00000312 C3 retn 736 737 read_start_sector: 738 00000313 8B4408 mov ax, [si+ptStartSector] 739 00000316 8B540A mov dx, [si+ptStartSector+2] 740 00000319 BB[220C] mov bx, BootSectorBuff 741 0000031C E874FF call lba_read 742 0000031F 722A jc short chk_a_pbs_retn 743 744 00000321 813E[200E]55AA cmp word [BootSectorBuff+510], 0AA55h 745 00000327 7521 jne short chk_a_pbs_stc 746 747 00000329 A0[230E] mov al, [bootsig] 748 0000032C 08C0 or al, al 749 0000032E 741B jz short chk_a_pbs_retn ; not a FAT fs (valid boot sector) 750 00000330 30E4 xor ah, ah 751 00000332 01C3 add bx, ax ; BootSectorBuffer + BS_BootSig offset 752 753 ; must be 754 ; same value of hidden sectors, same (extended boot) signature 755 756 00000334 803F29 cmp byte [bx], 29h ; Extd boot signature for FAT file systems 757 00000337 7511 jne short chk_a_pbs_stc 758 759 00000339 A1[3E0C] mov ax, [BootSectorBuff+28] ; Hidden sectors 760 0000033C 8B16[400C] mov dx, [BootSectorBuff+30] 761 00000340 3B4408 cmp ax, [si+ptStartSector] 762 00000343 7505 jne short chk_a_pbs_stc 763 00000345 3B540A cmp dx, [si+ptStartSector+2] 764 00000348 7401 je short chk_a_pbs_retn 765 766 chk_a_pbs_stc: 767 0000034A F9 stc ; not a valid boot sector 768 769 chk_a_pbs_retn: 770 0000034B C3 retn 771 772 ;============================================================================= 773 ; initialized data 774 ;============================================================================= 775 776 known_partitions: 777 0000034C 0102030405 db FS_FAT12, FS_XENIX, FS_XENIX_USR, FS_FAT16, FS_EXT_CHS 778 00000351 06070B0C db FS_FAT16_BIG, FS_NTFS, FS_FAT32_CHS, FS_FAT32_LBA 779 00000355 0E0F6371 db FS_FAT16_LBA, FS_EXT_LBA, FS_UNIX_SYSV, FS_RETROUNIX 780 00000359 728B8385 db FS_UNIX_V7, FS_LINUXSWAP, FS_LINUX, FS_LINUXEXT 781 0000035D A0A1 db FS_TRDD, FS_TRFS 782 783 0000035F 00 kpc: db 0 784 785 ;rw: db 42h ; LBA read (default) 786 787 DrvNum: 788 00000360 00 db 0 789 790 00000361 00 oldpbs: db 0 791 792 ;align 2 793 794 ;mbr_file_handle: 795 ; dw 0 796 797 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 798 ; Messages 799 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 800 801 TrDOS_Welcome: 802 00000362 0D0A db 0Dh, 0Ah 803 00000364 4D6173746572426F6F- db "MasterBoot Record/Sector Restore Utility for TR-DOS 386" 803 0000036D 74205265636F72642F- 803 00000376 536563746F72205265- 803 0000037F 73746F726520557469- 803 00000388 6C69747920666F7220- 803 00000391 54522D444F53203338- 803 0000039A 36 804 0000039B 0D0A db 0Dh, 0Ah 805 0000039D 76312E302E31313130- db "v1.0.111020 (c) Erdogan TAN 2020" 805 000003A6 323020286329204572- 805 000003AF 646F67616E2054414E- 805 000003B8 2032303230 806 000003BD 0D0A db 0Dh, 0Ah 807 000003BF 0D0A db 0Dh, 0Ah 808 000003C1 55736167653A20 db "Usage: " 809 000003C8 0D0A db 0Dh, 0Ah 810 000003CA 206D62726573746F72- db " mbrestor [option] " 810 000003D3 205B6F7074696F6E5D- 810 000003DC 203C68617264206469- 810 000003E5 736B206E616D653E20- 810 000003EE 3C6261636B75702066- 810 000003F7 696C65206E616D653E 811 00000400 0D0A db 0Dh, 0Ah 812 00000402 0D0A db 0Dh, 0Ah 813 00000404 48617264206469736B- db "Hard disk names: " 813 0000040D 206E616D65733A20 814 00000415 0D0A db 0Dh, 0Ah 815 00000417 0D0A db 0Dh, 0Ah 816 00000419 20686430202E2E666F- db " hd0 ..for MBR of 1st hard disk " 816 00000422 72204D4252206F6620- 816 0000042B 317374206861726420- 816 00000434 6469736B20 817 00000439 0D0A db 0Dh, 0Ah 818 0000043B 20686431202E2E666F- db " hd1 ..for MBR of 2nd hard disk " 818 00000444 72204D4252206F6620- 818 0000044D 326E64206861726420- 818 00000456 6469736B20 819 0000045B 0D0A db 0Dh, 0Ah 820 0000045D 20686432202E2E666F- db " hd2 ..for MBR of 3rd hard disk " 820 00000466 72204D4252206F6620- 820 0000046F 337264206861726420- 820 00000478 6469736B20 821 0000047D 0D0A db 0Dh, 0Ah 822 0000047F 20686433202E2E666F- db " hd3 ..for MBR of 4th hard disk " 822 00000488 72204D4252206F6620- 822 00000491 347468206861726420- 822 0000049A 6469736B20 823 0000049F 0D0A0D0A db 0Dh, 0Ah, 0Dh, 0Ah 824 000004A3 4F7074696F6E733A20 db "Options: " 825 000004AC 0D0A db 0Dh, 0Ah 826 000004AE 202D63203A20726573- db " -c : restore MBR code only " 826 000004B7 746F7265204D425220- 826 000004C0 636F6465206F6E6C79- 826 000004C9 20 827 000004CA 0D0A db 0Dh, 0Ah 828 000004CC 202D74203A20726573- db " -t : restore partition table only " 828 000004D5 746F72652070617274- 828 000004DE 6974696F6E20746162- 828 000004E7 6C65206F6E6C7920 829 000004EF 0D0A db 0Dh, 0Ah 830 000004F1 0D0A db 0Dh, 0Ah 831 000004F3 4578616D706C65733A db "Examples:" 832 000004FC 0D0A db 0Dh, 0Ah 833 000004FE 206D62726573746F72- db " mbrestor -c hd0 mbsector.bin " 833 00000507 202D6320686430206D- 833 00000510 62736563746F722E62- 833 00000519 696E20 834 0000051C 0D0A db 0Dh, 0Ah 835 0000051E 206D62726573746F72- db " mbrestor hd1 mbsector.bin " 835 00000527 20686431206D627365- 835 00000530 63746F722E62696E20 836 00000539 0D0A00 db 0Dh, 0Ah, 0 837 838 msg_inv_file_name: 839 0000053C 0D0A db 0Dh, 0Ah 840 0000053E 496E76616C69642066- db "Invalid file name !", 0Dh, 0Ah 840 00000547 696C65206E616D6520- 840 00000550 210D0A 841 00000553 2846696C65206E616D- db "(File name must fit to 8.3 DOS format) !" 841 0000055C 65206D757374206669- 841 00000565 7420746F20382E3320- 841 0000056E 444F5320666F726D61- 841 00000577 74292021 842 0000057B 0D0A00 db 0Dh, 0Ah, 0 843 844 msg_kp_notfound: 845 0000057E 0D0A db 0Dh, 0Ah 846 00000580 496E76616C69642062- db "Invalid backup file !", 0Dh, 0Ah 846 00000589 61636B75702066696C- 846 00000592 6520210D0A 847 00000597 284D425220646F6573- db '(MBR does not contain a known partition type) ! ' 847 000005A0 206E6F7420636F6E74- 847 000005A9 61696E2061206B6E6F- 847 000005B2 776E20706172746974- 847 000005BB 696F6E207479706529- 847 000005C4 202120 848 000005C7 0D0A db 0Dh, 0Ah 849 000005C9 00 db 0 850 851 msg_overwrite_question: 852 000005CA 0D0A db 0Dh, 0Ah 853 000005CC 446F20796F75207761- db "Do you want to overwrite masterboot sector ? " 853 000005D5 6E7420746F206F7665- 853 000005DE 727772697465206D61- 853 000005E7 73746572626F6F7420- 853 000005F0 736563746F72203F20 854 000005F9 00 db 0 855 856 000005FA 594553 _YES: db "YES" 857 000005FD 0D0A00 db 0Dh, 0Ah, 0 858 859 00000600 4E4F _NO: db "NO" 860 00000602 0D0A00 db 0Dh, 0Ah, 0 861 862 msg_writing_mbr: 863 00000605 0D0A db 0Dh, 0Ah 864 00000607 57726974696E67206D- db "Writing masterboot sector ... " 864 00000610 6173746572626F6F74- 864 00000619 20736563746F72202E- 864 00000622 2E2E20 865 00000625 00 db 0 866 msg_OK: 867 00000626 204F4B2E db ' OK.' 868 CRLF: 869 0000062A 0D0A00 db 0Dh, 0Ah, 0 870 871 msg_file_notfound: 872 0000062D 0D0A db 0Dh, 0Ah 873 0000062F 4261636B7570206669- db "Backup file not found !" 873 00000638 6C65206E6F7420666F- 873 00000641 756E642021 874 00000646 0D0A00 db 0Dh, 0Ah, 0 875 876 msg_file_read_error: 877 00000649 0D0A db 0Dh, 0Ah 878 0000064B 46696C652072656164- db "File reading error !" 878 00000654 696E67206572726F72- 878 0000065D 2021 879 0000065F 0D0A00 db 0Dh, 0Ah, 0 880 881 msg_disk_not_ready_error: 882 00000662 0D0A db 0Dh, 0Ah 883 00000664 4469736B2072656164- db "Disk read error or drive not ready !" 883 0000066D 206572726F72206F72- 883 00000676 206472697665206E6F- 883 0000067F 742072656164792021 884 00000688 0D0A00 db 0Dh, 0Ah, 0 885 886 msg_disk_write_error: 887 0000068B 0D0A db 0Dh, 0Ah 888 0000068D 4469736B2077726974- db "Disk write error !" 888 00000696 65206572726F722021 889 0000069F 0D0A00 db 0Dh, 0Ah, 0 890 891 msg_inv_backup_file: 892 000006A2 0D0A db 0Dh, 0Ah 893 000006A4 496E76616C69642062- db "Invalid backup file !", 0Dh, 0Ah 893 000006AD 61636B75702066696C- 893 000006B6 6520210D0A 894 000006BB 28496D70726F706572- db "(Improper file attributes or wrong file size) !" 894 000006C4 2066696C6520617474- 894 000006CD 72696275746573206F- 894 000006D6 722077726F6E672066- 894 000006DF 696C652073697A6529- 894 000006E8 2021 895 000006EA 0D0A00 db 0Dh, 0Ah, 0 896 897 msg_inv_file_mbr: 898 000006ED 0D0A db 0Dh, 0Ah 899 000006EF 496E76616C69642062- db "Invalid backup file !", 0Dh, 0Ah 899 000006F8 61636B75702066696C- 899 00000701 6520210D0A 900 00000706 28496E76616C696420- db "(Invalid MBR) !" 900 0000070F 4D4252292021 901 00000715 0D0A00 db 0Dh, 0Ah, 0 902 903 msg_file_pbsv_error: 904 00000718 0D0A db 0Dh, 0Ah 905 0000071A 4D4153544552424F4F- db "MASTERBOOT SECTOR WRITING PERMISSION DENIED ! Because ... " 905 00000723 5420534543544F5220- 905 0000072C 57524954494E472050- 905 00000735 45524D495353494F4E- 905 0000073E 2044454E4945442021- 905 00000747 204265636175736520- 905 00000750 2E2E2E20 906 00000754 0D0A db 0Dh, 0Ah 907 00000756 537461727420736563- db "Start sector of present active (or primary DOS) partition " 907 0000075F 746F72206F66207072- 907 00000768 6573656E7420616374- 907 00000771 69766520286F722070- 907 0000077A 72696D61727920444F- 907 00000783 532920706172746974- 907 0000078C 696F6E20 908 00000790 0D0A db 0Dh, 0Ah 909 00000792 6861732076616C6964- db "has valid boot sector signature; but start sector of the new " 909 0000079B 20626F6F7420736563- 909 000007A4 746F72207369676E61- 909 000007AD 747572653B20627574- 909 000007B6 207374617274207365- 909 000007BF 63746F72206F662074- 909 000007C8 6865206E657720 910 000007CF 0D0A db 0Dh, 0Ah 911 000007D1 61637469766520286F- db "active (or primary DOS) partition has not a valid boot sector ! " 911 000007DA 72207072696D617279- 911 000007E3 20444F532920706172- 911 000007EC 746974696F6E206861- 911 000007F5 73206E6F7420612076- 911 000007FE 616C696420626F6F74- 911 00000807 20736563746F722021- 911 00000810 20 912 00000811 0D0A00 db 0Dh, 0Ah, 0 913 914 SizeOfFile equ $-100 915 916 ;============================================================================= 917 ; uninitialized data 918 ;============================================================================= 919 920 bss_start: 921 922 ABSOLUTE bss_start 923 924 alignb 2 925 926 mbr_file_name: 927 00000814 resb 13 928 00000821 ?? resb 1 ; word alignment 929 930 bss_clear_end: 931 932 ;alignb 2 933 934 ; Masterboot sector (MBR) 935 936 MBR: ; backup 937 00000822 resb 512 938 939 MasterBootBuff: 940 MasterBootCode: 941 00000A22 resb 446 942 PartitionTable: 943 00000BE0 resb 64 944 MBIDCode: 945 00000C20 ???? resw 1 946 947 BootSectorBuff: 948 00000C22 resb 512 949 950 00000E22 ?? option: resb 1 951 00000E23 ?? bootsig: resb 1 952 953 954 bss_end: