1 ; **************************************************************************** 2 ; FS1_MBR.ASM (FS1_MBR.BIN) - SINGLIX FS1 MASTERBOOT SECTOR for TRDOS 386 OS 3 ; **************************************************************************** 4 ; Last Update: 22/12/2017 (2nd version) -TRDOS 386 FAT & SINGLIX FS- 5 ; ---------------------------------------------------------------------------- 6 ; Beginning: 26/04/2009 (1st version) -WINDOWS XP MBR & TRDOS 8086 SINGLIX FS- 7 ; ---------------------------------------------------------------------------- 8 ; Assembler: NASM version 2.11 9 ; ---------------------------------------------------------------------------- 10 ; Turkish Rational DOS 11 ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016) 12 ; **************************************************************************** 13 ; nasm fs1_mbr.s -l fs1_mbr.lst -o FS1_MBR.BIN 14 ; ---------------------------------------------------------------------------- 15 ; 16 ;############################################################################# 17 ; 18 ; SINGLIX FS1 MASTER BOOT RECORD (c) Erdogan Tan [26/04/2009] 19 ; 20 ; Derived from WINDOWS XP MASTER BOOT RECORD 21 ; 22 ; Modified for SINGLIX Operating System v1.0b and SINGLIX FS1 File System v1.0 23 ; ! WINDOWS XP compatible MBR code ! 24 ; 25 ; Original code by (c) Microsoft Corporation 2000 [ Windows XP SP2 2004 ] 26 ; DMADMIN.EXE (4 August 2004) offset 216616 (512 byte) (XP_MASTERBOOT.BIN) 27 ; WINDOWS XP/SP2 Turkish OS Master Boot code (masterboot.bin) 28 ; Singlix Code Grabber v2.0 [binfilehex.exe] XP_MASTERBOOT.BIN, masterboot.bin 29 30 ; Microsoft Macro Assembler 31 ; compatible assembly source code 32 ; for SINGLIX FS1 MASTER BOOT CODE (c) Erdogan Tan 2009 33 ; 34 ; Disassembled by Erdogan Tan [26/04/2009] as Microsoft MASM compatible code 35 ; by using DASM.EXE [24/3/1993] and PV.EXE [22/1/1993] 36 ; 37 ; Some explanations from 38 ;"Win2k Master Boot Record (MBR) Revealed!" html page by (c) Daniel B. Sedory 39 ; http://www.geocities.com/thestarman3/asm/mbr/Win2kmbr.htm 40 ; http://mirror.href.com/thestarman/asm/mbr/Win2kmbr.htm 41 42 ;############################################################################# 43 44 [BITS 16] ; 16 bit (x86, real mode) code 45 46 ;############################################################################# 47 ;# 48 ;# ENTRY POINT 49 ;# 50 ;############################################################################# 51 52 [ORG 600h] ; Final memory location 0:600h 53 54 ;############################################################################# 55 ;# 56 ;# PROCEDURE proc_start 57 ;# 58 ;############################################################################# 59 60 start: 61 00000000 31C0 xor ax, ax ; db 33h, 0C0h 62 00000002 8ED0 mov ss, ax 63 00000004 BC007C mov sp, 7C00h 64 00000007 FB sti ; Enable interrupts 65 00000008 50 push ax 66 00000009 07 pop es 67 0000000A 50 push ax 68 0000000B 1F pop ds 69 0000000C FC cld ; Clear direction flag 70 0000000D BE1B7C mov si, 7C1Bh ; offset 01Bh (label loc_01Bh) 71 00000010 BF1B06 mov di, 61Bh 72 00000013 50 push ax 73 00000014 57 push di 74 00000015 B9E501 mov cx, 1E5h 75 00000018 F3A4 repz movsb ; Repeat if ZF = 1, CX > 0 76 ; Move byte from DS:SI to ES:DI 77 0000001A CB retf ; Return FAR 78 79 loc_01Bh: 80 0000001B BDBE07 mov bp, 7BEh ; db 0BDh, 0BEh, 07h 81 0000001E B104 mov cl, 4 ; db 0B1h, 04h 82 loc_020h: 83 00000020 386E00 cmp [bp+0], ch ; 0 84 00000023 7C2C jl short loc_02Eh ; Jump if less ( < ) 85 00000025 7536 jne short loc_03Ah ; Jump if not equal ( != ) 86 00000027 83C510 add bp, 10h 87 0000002A E2F4 loop loc_020h ; Loop if CX > 0 88 89 ; Beginning of SINGLIX MBR code extension 90 ; SINGLIX MBR feature : Check Sector 1 for a valid boot record 91 0000002C BB007C mov bx, 7C00h 92 0000002F B90200 mov cx, 2 93 00000032 BA8000 mov dx, 80h 94 loc_read_bootsector_location: 95 00000035 B80102 mov ax, 201h 96 97 00000038 CD13 int 13h ; BIOS Service func ( ah ) = 2 98 ; Read disk sectors 99 ;IN: AL-sec num CH-track CL-sec 100 ; DH-head DL-drive ES:BX-buffer 101 ;OUT: CF-flag AH-stat AL-sec read 102 0000003A 7208 jc short loc_check_bootsector_number 103 104 loc_check_bootsector_sign: 105 ;cmp word [7DFEh], 0AA55h ; Check for the Magic Word/Number 106 0000003C 813E[FE77]55AA cmp word [data_7FEh+7600h], 0AA55h 107 00000042 746A je short loc_094h 108 loc_check_bootsector_number: 109 00000044 83F902 cmp cx, 2 110 00000047 7506 jne short loc_int18h 111 ; SINGLIX MBR feature : Check Sector 63 for a valid boot record 112 00000049 FEC6 inc dh ; mov dh, 1 ; Head 1 113 0000004B 88F1 mov cl, dh ; mov cl, 1 114 0000004D EBE6 jmp short loc_read_bootsector_location 115 ; End of SINGLIX MBR code extension 116 117 loc_int18h: 118 0000004F CD18 int 18h ; Switch to BASIC (if there is!?) 119 loc_02Eh: 120 00000051 89EE mov si, bp 121 loc_030h: 122 00000053 83C610 add si, 10h 123 00000056 49 dec cx 124 00000057 7415 jz short loc_04Fh ; Jump if zero (Jump if equal) 125 00000059 382C cmp [si], ch ; 0 126 0000005B 74F6 je short loc_030h 127 loc_03Ah: 128 ; SINGLIX MBR MODIFICATION 129 0000005D BE[4901] mov si, msg_ipt ; Invalid partition table! 130 131 print_msg: ; Print Error Message 132 ; SINGLIX MBR MODIFICATION 133 loc_041h: 134 00000060 AC lodsb ; Load byte at DS:SI to AL 135 loc_042h: 136 00000061 3C00 cmp al, 0 137 00000063 74FC je short loc_042h 138 00000065 BB0700 mov bx, 7 139 00000068 B40E mov ah, 0Eh 140 0000006A CD10 int 10h ; BIOS Service func ( ah ) = 0Eh 141 ; Write char as TTY 142 ;IN: AL-char BH-page BL-color 143 0000006C EBF2 jmp short loc_041h 144 loc_04Fh: 145 0000006E 884E10 mov [bp+10h], cl ; 0 146 00000071 E84400 call load_bootsector ; offset 09Bh 147 00000074 7325 jnc short loc_081h 148 loc_057h: 149 00000076 FE4610 inc byte [bp+10h] ; 1 150 00000079 807E040B cmp byte [bp+4], 0Bh ; FAT 32 CHS partition 151 0000007D 740B je short loc_06Bh 152 0000007F 807E040C cmp byte [bp+4], 0Ch ; FAT 32 LBA partition 153 00000083 7405 je short loc_06Bh 154 loc_066h: 155 ; SINGLIX MBR MODIFICATION 156 00000085 BE[6301] mov si, msg_elos ; Error loading operating system! 157 00000088 EBD6 jmp short print_msg ; Jump if not equal ( != ) 158 loc_06Bh: 159 0000008A 80460206 add byte [bp+2], 6 ; Beginning sector (in track) 160 0000008E 83460806 add word [bp+8], 6 ; Start sector (LBA, low word) 161 00000092 83560A00 adc word [bp+0Ah], 0 ; ADD with carry (LBA, high word) 162 00000096 E81F00 call load_bootsector ; Load FAT 32 backup boot record 163 00000099 72EA jc short loc_066h 164 loc_081h: 165 ;cmp word [7DFEh], 0AA55h ; Check for the Magic Word/Number 166 0000009B 813E[FE77]55AA cmp word [data_7FEh+7600h], 0AA55h 167 000000A1 740B je short loc_094h 168 000000A3 807E1000 cmp byte [bp+10h], 0 169 000000A7 74CD je short loc_057h 170 171 ; SINGLIX MBR MODIFICATION 172 000000A9 BE[8401] mov si, msg_mos ; Missing operating system! 173 000000AC EBB2 jmp short print_msg 174 loc_094h: 175 ; Beginning of SINGLIX MBR code extension 176 ; SINGLIX MBR Feature/Sign 177 000000AE A1[A101] mov ax, [singlix_mbr_sign] ; 417 178 ; End of SINGLIX MBR code extension 179 000000B1 89E7 mov di, sp 180 000000B3 1E push ds 181 000000B4 57 push di 182 000000B5 89EE mov si, bp 183 000000B7 CB retf ; Return FAR 184 ; jump to the Boot Sector code 185 186 ;############################################################################# 187 ;# 188 ;# PROCEDURE proc_load_bootsector 189 ;# 190 ;############################################################################# 191 192 ; Original WINDOWS XP MBR Boot Sector Reading/Loading PROCEDURE 193 ; by Microsoft Corporation 194 195 load_bootsector: 196 197 loc_09Bh: 198 000000B8 BF0500 mov di, 5 ; Retry count 199 000000BB 8A5600 mov dl, [bp+0] ; 80h 200 000000BE B408 mov ah, 8 201 000000C0 CD13 int 13h ; BIOS Service func ( ah ) = 8 202 ; Get current drive parameters 203 ; OUT: DL-drvs DH-heads CL-sects 204 ; CH-tracks CF-flag AH-status 205 000000C2 7223 jc short loc_0CAh 206 000000C4 88C8 mov al, cl 207 000000C6 243F and al, 3Fh ; Number of sectors 208 000000C8 98 cbw ; Convert byte to word 209 000000C9 88F3 mov bl, dh ; Number of heads - 1 210 000000CB 88E7 mov bh, ah ; 0 211 000000CD 43 inc bx ; Number of heads 212 000000CE F7E3 mul bx ; AX = sectors*heads 213 000000D0 89CA mov dx, cx 214 000000D2 86D6 xchg dl, dh 215 000000D4 B106 mov cl, 6 216 000000D6 D2EE shr dh, cl ; Shift cyl bits 8&9 to bit 0&1 217 000000D8 42 inc dx ; Number of cylinders 218 000000D9 F7E2 mul dx ; DX_AX = cylinders*(sectors*heads) 219 000000DB 39560A cmp [bp+0Ah], dx ; Start sector < CHS total sects? 220 000000DE 7723 jnbe short loc_0E6h ; no, let's use int 13h extensions 221 000000E0 7205 jb short loc_0CAh ; yes, lets use CHS parameters 222 000000E2 394608 cmp [bp+8], ax ; Start sector < CHS total sects? 223 000000E5 731C jnb short loc_0E6h ; no, let's use int 13h extensions 224 loc_0CAh: 225 000000E7 B80102 mov ax, 0201h 226 000000EA BB007C mov bx, 7C00h 227 000000ED 8B4E02 mov cx, [bp+2] 228 000000F0 8B5600 mov dx, [bp+0] 229 000000F3 CD13 int 13h ; BIOS Service func ( ah ) = 2 230 ; Read disk sectors 231 ;IN: AL-sec num CH-track CL-sec 232 ; DH-head DL-drive ES:BX-buffer 233 ;OUT: CF-flag AH-stat AL-sec read 234 000000F5 7351 jnc short loc_12Bh 235 000000F7 4F dec di 236 000000F8 744E jz short loc_12Bh 237 238 000000FA 30E4 xor ah, ah 239 000000FC 8A5600 mov dl, [bp+0] 240 000000FF CD13 int 13h ; BIOS Service func ( ah ) = 0 241 ; Reset disk system 242 00000101 EBE4 jmp short loc_0CAh 243 244 loc_check_int13h_extensions: 245 loc_0E6h: 246 00000103 8A5600 mov dl, [bp+0] 247 00000106 60 pusha ; db 60h 248 00000107 BBAA55 mov bx, 55AAh ; db 0BBh, 0AAh, 55h 249 0000010A B441 mov ah, 41h ; db 0B4h, 41h 250 0000010C CD13 int 13h ; db 0CDh, 13h 251 0000010E 7236 jc short loc_129h 252 253 00000110 81FB55AA cmp bx, 0AA55h ; Extensions present 254 00000114 7530 jne short loc_129h 255 00000116 F6C101 test cl, 1 ; Fixed disk access subset check 256 00000119 742B jz short loc_129h 257 258 0000011B 61 popa ; db 61h 259 loc_0FFh: 260 0000011C 60 pusha ; db 60h 261 262 0000011D 6A00 push 0 ; db 6Ah, 00h 263 0000011F 6A00 push 0 ; db 6Ah, 00h 264 00000121 FF760A push word [bp+0Ah] ; db 0FFh, 76h, 0Ah 265 00000124 FF7608 push word [BP+08h] ; db 0FFh, 76h, 08h 266 00000127 6A00 push 0 ; db 6Ah, 00h 267 00000129 68007C push 7C00h ; db 68h, 00h, 7Ch 268 0000012C 6A01 push 1 ; db 6Ah, 01h 269 0000012E 6A10 push 10h ; db 6Ah, 10h 270 271 00000130 B442 mov ah, 42h 272 00000132 89E6 mov si, sp 273 00000134 CD13 int 13h 274 275 00000136 61 popa ; db 61h 276 00000137 61 popa ; db 61h 277 278 00000138 730E jnc short loc_12Bh 279 280 0000013A 4F dec di 281 282 0000013B 740B jz short loc_12Bh 283 284 0000013D 30E4 xor ah, ah 285 0000013F 8A5600 mov dl, [bp+0] 286 00000142 CD13 int 13h 287 288 00000144 EBD6 jmp short loc_0FFh 289 290 loc_129h: 291 00000146 61 popa ; db 61h 292 293 00000147 F9 stc ; db 0F9h 294 loc_12Bh: 295 00000148 C3 retn ; db 0C3h 296 297 298 ; SINGLIX MBR MODIFICATION 299 300 ; Error messages 301 msg_ipt: 302 00000149 496E76616C69642070- db 'Invalid partition table !' 302 00000152 6172746974696F6E20- 302 0000015B 7461626C652021 303 00000162 00 db 0 304 msg_elos: 305 00000163 4572726F72206C6F61- db 'Error loading operating system !' 305 0000016C 64696E67206F706572- 305 00000175 6174696E6720737973- 305 0000017E 74656D2021 306 00000183 00 db 0 307 msg_mos: 308 00000184 4D697373696E67206F- db 'Missing operating system !' 308 0000018D 7065726174696E6720- 308 00000196 73797374656D2021 309 0000019E 00 db 0 310 311 0000019F E107 dw 2017 ; SINGLIX FS1 MBR version 312 313 times 1A1h-($-$$) db 0 314 315 singlix_mbr_sign: ; MBR offset 417 316 000001A1 A101 dw 01A1h ; SINGLIX MBR sign (=417) 317 318 000001A3 00 db 0 319 320 ; SINGLIX MBR MODIFICATION 321 ; (for disk images, TRDOS 386, 2nd version) 322 ; CHS parameters 323 324 pt_cylinders: ; C 325 000001A4 0000 dw 0 326 pt_heads: ; H 327 000001A6 0000 dw 0 328 pt_sectors: ; S 329 000001A8 0000 dw 0 330 331 ;org 7BEh 332 ;times 1BEh-($-$$) db 0 333 000001AA 00 times 1BCh-($-$$) db 0 334 000001BC BE07 dw 7BEh 335 partition_table: 336 000001BE 00 times 64 db 0 337 338 ;org 7FEh 339 ;org 7DFEh 340 ; 22/12/2017 341 ;times 1FEh-($-$$) db 0 342 bs_sign: 343 000001FE 55 data_7FEh: db 55h 344 000001FF AA db 0AAh