.model tiny .586p CODE SEGMENT ASSUME CS:CODE ORG 100H BASE DB 90H ; Replaced DW 0FFFFH,0FFFFH JMP START DW 2,STRAT,ENTRY DB 1,0,0,0,0,0,0,0 STRAT: MOV CS:[HDROFF],BX MOV CS:[HDRSEG],ES RETF_1 PROC FAR RET RETF_1 ENDP ENTRY: CLD PUSHAD PUSH DS PUSH ES MOV SI,OFFSET VECTOR LDS BX,DWORD PTR CS:[HDROFF] MOV AL,DS:[BX+1] MOV AH,DS:[BX+0DH] MOV CX,DS:[BX+12H] MOV EDX,DS:[BX+1AH] XCHG DI,AX MOV AL,DS:[BX+2] SUB AH,AH ADD SI,AX ADD SI,AX CMP AL,0BH JA ERROR3 XCHG DI,AX LES DI,DWORD PTR DS:[BX+0EH] PUSH CS POP DS JMP WORD PTR DS:[SI] NODATA: MOV AH,3 JMP SHORT EXIT1 ERROR3: MOV AL,3 MOV AH,81H STC JMP SHORT EXIT1 EXIT: MOV AH,1 CLC EXIT1: LDS BX,DWORD PTR CS:[HDROFF] MOV DS:[BX+3],AX MOV CS:[EXVAL],AX POP ES POP DS POPAD MOV AX,CS:[EXVAL] RETF_2 PROC FAR RET RETF_2 ENDP INIT: PUSH CS POP ES IN AL,92H OR AL,2 OUT 92H,AL OUT 0EBH,AL XOR EBX,EBX SCAN: MOV EAX,0E820H MOV ECX,20H MOV EDX,534D4150H MOV DI,OFFSET MAPBUF INT 15H JC ERR1 CMP BYTE PTR [DI+16],1 JNZ SCAN1 CMP DWORD PTR [DI+4],1 JNZ SCAN1 CMP DWORD PTR [DI],0 JNZ SCAN1 CMP DWORD PTR [DI+12],0 ;FAT16 Limit <4GB JNZ TOOBIG MOV EAX,[DI+8] CMP EAX,0FFF60000H JC SIZEOK TOOBIG: MOV EAX,0FFF60000H SIZEOK: ADD EAX,1FFH SHR EAX,9 CMP EAX,400001H JNC NOT2GB CMP EAX,3FFE21H JC NOT2GB MOV EAX,3FFE21H NOT2GB: CMP EAX,1027H JC ERR4 MOV DS:[NUMSEC],EAX MOV BL,128 MOV ECX,EAX SUB EAX,289 SUB ECX,49 CADJ: CMP EAX,3FFD01H JNC CADJ1 CMP BL,1 JZ CADJ1 SHR BL,1 ADD EAX,EAX ADD ECX,ECX JMP CADJ CADJ1: MOV DS:[CLUSIZ],BL ADD ECX,7FFFH SHR ECX,15 MOV DS:[FATSIZ],CX MOV AH,2AH INT 21H SUB CX,1980 SHL CX,4 ADD CL,DH SHL CX,5 ADD CL,DL MOV DS:[SIG1],CX MOV AH,2CH INT 21H MOVZX BX,CH SHL BX,6 ADD BL,CL SHL BX,5 SHR DH,1 ADD BL,DL MOV DS:[SIG2],BX XOR EAX,EAX MOV AX,CS SHL EAX,4 MOVZX EBX,WORD PTR DS:[BUFFER] ADD EBX,EAX MOV DS:[BUFFP],EBX XOR EBX,EBX MOV DS:[SECTOR],EBX MOV BX,OFFSET PMCODE ADD EBX,EAX MOV DS:[PMC],EBX XOR AX,AX MOV DS,AX TEST WORD PTR DS:[19CH],0FFFFH PUSH CS POP DS JZ NOEMM MOV AX,0FFA5H INT 67H CMP AH,84H JNZ NOEMM MOV DS:[EMMA1],CX MOV DS:[EMMA2],BX JMP YESEMM NOEMM: MOV BX,OFFSET EMMOFF MOV BYTE PTR [BX],0C3H MOV BX,OFFSET EMMON MOV BYTE PTR [BX],0C3H YESEMM: LEA SI,BOOT MOV DI,DS:[BUFFER] MOV BX,DI MOV CX,20H REP MOVSW XOR AX,AX MOV CX,0DFH REP STOSW MOV AX,0AA55H STOSW MOV AX,301H CALL XFER MOV DI,DS:[BUFFER] XOR AX,AX MOV CX,100H REP STOSW MOV CX,DS:[FATSIZ] CALL FILL1 MOV CX,20H CALL FILL LDS BX,DWORD PTR DS:[HDROFF] MOV BYTE PTR DS:[BX+0DH],1 MOV WORD PTR DS:[BX+12H],OFFSET BPBTAB MOV DS:[BX+14H],CS MOV DX,CS:[BUFFER] ADD DX,200H MOV DS:[BX+0EH],DX MOV DS:[BX+10H],CS JMP EXIT SCAN1: AND BX,BX JZ ERR2 JMP SCAN FILL1: MOV EAX,0FFFFFFF8H MOV BX,DS:[BUFFER] MOV [BX],EAX FILL: INC DWORD PTR DS:[SECTOR] MOV AX,301H MOV BX,DS:[BUFFER] CALL XFER XOR EAX,EAX MOV [BX],EAX LOOP FILL RET MEDIA: CMP AL,DS:[DRIVE] JNZ NEWDRV CMP AH,DS:[DTYPE] JNZ NEWCOD MOV CL,AL PUSH DS SUB AX,AX MOV DS,AX MOV AL,DS:[43FH] POP DS MOV AH,1 SHL AH,CL TEST AH,AL JZ NEWDRV MOV AL,1 JMP SHORT STATUS NEWDRV: XOR AL,AL JMP SHORT STATUS NEWCOD: MOV AL,0FFH STATUS: LDS BX,DWORD PTR DS:[HDROFF] MOV DS:[BX+0EH],AL JMP EXIT BLDBPB: MOV DWORD PTR DS:[SECTOR],0 PUSH DS POP ES MOV BX,DS:[BUFFER] MOV AX,201H CALL XFER MOV AL,0F8H CMP WORD PTR [BX+1FEH],0AA55H JNZ NOSIG LEA SI,[BX+0BH] MOV DI,OFFSET SECSIZ MOV CX,19H REP MOVSB MOV AL,DS:[BX+15H] NOSIG: LDS BX,DWORD PTR DS:[HDROFF] MOV DS:[BX+0DH],AL MOV WORD PTR DS:[BX+12H],OFFSET SECSIZ MOV DS:[BX+14H],CS JMP EXIT READ: PUSH AX MOV AL,2 JMP SHORT RD_WR WRITE: AND EDX,EDX JNZ WR1 MOV AL,0FFH WR1: PUSH AX MOV AL,3 RD_WR: MOV DS:[IOREQ],AL POP AX AND CX,CX JZ EXIT MOV DS:[DRIVE],AL MOV BX,DI PUSH ES IOLOOP: MOV DS:[SECTOR],EDX PUSH BX MOV AX,ES SHR BX,4 ADD AX,BX MOV ES,AX POP BX AND BX,15 MOV AX,CX CMP AX,127 JC SZOK MOV AX,127 SZOK: MOV DS:[IOSIZE],AX MOV AH,DS:[IOREQ] CALL XFER MOVZX EAX,WORD PTR DS:[IOSIZE] SUB CX,AX JBE DONE ADD EDX,EAX SHL AX,9 ADD BX,AX JNB IOLOOP LDS BX,DWORD PTR DS:[HDROFF] SUB DS:[BX+12H],CX DONE: POP ES JMP EXIT REALM: CALL EMMOFF SMSW AX AND AL,1 JZ NOPROT PUSH CS POP DS MOV DX,OFFSET BADEMM MOV AH,9 INT 21H MOV AH,0 INT 16H DB 0EBH,0FEH NOPROT: CLI MOV EAX,ECX SHL EAX,9 MOV EDX,1 MOV ECX,0C0000100H WRMSR MOV ECX,0C0010015H RDMSR OR EAX,20000H WRMSR MOV AX,SI XOR ECX,ECX MOV CH,AL XOR ESI,ESI CMP AH,2 JNZ WR MOVZX EDI,BX DB 67H,64H REP MOVSW JMP RDWR WR: MOV AX,ES:[BX] MOV FS:[ESI],AX ADD ESI,2 ADD BX,2 LOOP WR WBINVD RDWR: MOV ECX,0C0010015H RDMSR AND EAX,0FFFDFFFFH WRMSR STI CALL EMMON ENDPRO: POPAD POP FS RET XFER: PUSH FS ;AH=MODE AL=LEN ES:BS=DATA [SECTOR] PUSHAD MOV ECX,DS:[SECTOR] MOV SI,AX XOR EBP,EBP MOV BP,ES SHL EBP,4 MOVZX EAX,BX ADD EBP,EAX MOV EDI,DS:[BUFFP] MOV AX,1600H INT 2FH AND AL,AL JZ REALM XOR AX,AX MOV DS,AX MOV DS:[3DCH],OFFSET ENDPRO MOV DS:[3DEH],AX MOV DS:[3E0H],CS MOV DS:[3E2H],AX MOV DWORD PTR DS:[3E4H],23202H MOV DS:[3E8H],SP MOV DS:[3EAH],AX MOV DS:[3ECH],SS MOV DS:[3EEH],AX MOV DS:[3F0H],ES MOV DS:[3F2H],AX MOV DS:[3F4H],CS MOV DS:[3F6H],AX MOV DS:[3F8H],FS MOV DS:[3FAH],AX MOV DS:[3FCH],GS MOV DS:[3FEH],AX MOV EAX,CS:[PMC] DB 0FH,34H ;SYSENTER ;SI=MODE:LEN ECX=SECTOR EDI=BUFFER EBP=DATA ;Following Code Inverted PMCODE: ADD SP,3CH ;Move ESP from 3A0 to 3DC DB 66H MOV AX,30H MOV DS,AX MOV ES,AX MOV FS,AX MOV BX,SI SHL CX,9 MOV SI,CX MOV CX,15H DW 0C001H RDMSR DB 0DH ;OR EAX DD 20000H WRMSR NEXT: PUSH SI PUSH DI MOV AX,SI MOV DX,1 DW 0 MOV CX,100H DW 0C000H WRMSR CMP BH,2 JNZ SHORT PWR MOV EAX,CR0 DB 25H ;AND EAX DD 7FFFFFFFH MOV CR0,EAX PRD: XOR SI,SI MOV CX,80H DW 0 DB 64H REP MOVSW MOV EAX,CR0 DB 0DH ;OR EAX DD 80000000H MOV CR0,EAX LEA SI,[BX-200H] DW -1 MOV DI,BP MOV CX,80H DW 0 REP MOVSW JMP SHORT PRDWR NEXT1: JMP SHORT NEXT PWR: MOV SI,BP MOV CX,80H DW 0 REP MOVSW SUB DI,200H DW 0 XOR SI,SI MOV EAX,CR0 DB 25H ;AND EAX DD 7FFFFFFFH MOV CR0,EAX MOV CX,80H DW 0 PWR1: MOV AX,[BX] MOV FS:[BP+0],AX ADD SI,4 ADD DI,4 LOOP PWR1 MOV EAX,CR0 DB 0DH ;OR EAX DD 80000000H MOV CR0,EAX PRDWR: POP DI POP SI ADD SI,200H DW 0 ADD BP,200H DW 0 DEC BL JNZ SHORT NEXT1 CMP BH,2 JZ SHORT PEND WBINVD PEND: MOV CX,15H DW 0C001H RDMSR DB 25H ;AND EAX DD 0FFFDFFFFH WRMSR IRET EMMOFF: MOV AX,0 CALL EMM MOV DS:[EMMSAV],AL MOV AL,1 JMP EMM1 EMMON: MOV AL,DS:[EMMSAV] EMM1: MOV AH,1 EMM: PUSHAD DB 0FFH,1EH ;CALL FAR [EMM] DW OFFSET EMMA1 POPAD RET VECTOR DW INIT,MEDIA,BLDBPB,ERROR3,READ,NODATA,EXIT,EXIT DW WRITE,WRITE,EXIT,EXIT HDROFF DW 0 HDRSEG DW 0 SECTOR DD 0 DRIVE DB 0FFH IOREQ DB 0 IOSIZE DW 0 EXVAL DW 0 EMMA1 DW 0 EMMA2 DW 0 EMMSAV DB 0 BPBTAB DW SECSIZ ;One Instance BOOT: JMP SHORT BCODE NOP IDENT DB 'RLOEW 64' SECSIZ DW 200H CLUSIZ DB 0 ;Set FATOFF DW 1 FATCNT DB 1 DIRSIZ DW 200H DW 0 DTYPE DB 0F8H FATSIZ DW 0 ;Set TRKSIZ DW 32 SIDES DW 128 PRTOFF DD 0 NUMSEC DD 0 ;Set DRV DB 80H,0,29H SIG1 DW 0 SIG2 DW 0 LAB DB ' ' FTYPE DB 'FAT16 ' BCODE: RET DB 0 MAPBUF DD 0,0 ;Buffer is 20 Bytes LENL DD 0 LENH DD 0 DD 0 DPB DB 0,0,0,2,0,0,1,0,1,0,2,0,0,0,0,0 DB 0,0,0,0,1,0,0,0F8H,0FFH,0FFH,0FFH,0FFH,0FFH,0,0,0FFH DB 0FFH DB 1CH DUP(0) BADEMM DB 13,10,'UNABLE TO TURN OFF VIRTUAL MODE MEMORY MANAGER',13,10,13,10,24H BUFFP DD 0 PMC DD 0 BUFFER DW BUFFER+2 DB 512 DUP(0) ERR1: MOV DX,OFFSET MESS1 JMP REPORT ERR2: MOV DX,OFFSET MESS2 JMP REPORT ERR4: MOV DX,OFFSET MESS4 REPORT: PUSH CS POP DS MOV AH,9 INT 21H JMP ERROR3 MESS1 DB 'BIOS MEMORY MAP NOT FOUND',13,10,24H MESS2 DB 'NO 64-BIT MEMORY',13,10,24H MESS4 DB 'DRIVE TOO SMALL FOR FAT16',13,10,24H START: MOV AH,0 MOV SI,81H S1: LODSB CMP AL,20H JZ S1 CMP AL,61H JC S2 SUB AL,20H S2: CMP AL,43H JC S5 CMP AL,5BH JNC S5 SUB AL,41H MOV AH,AL S5: PUSH AX MOV AH,52H INT 21H POP AX AND AH,AH JNZ YESLTR MOV AH,ES:[BX+20H] JMP GOTLTR YESLTR: CMP AH,ES:[BX+20H] JC BADLTR CMP AH,ES:[BX+21H] JNC BADLTR GOTLTR: MOV DS:[DPB],AH MOV WORD PTR DS:[DPB+15H],CS INC AH MOV ES:[BX+20H],AH PUSH CS POP ES MOV BX,OFFSET REQ PUSH CS CALL STRAT PUSH CS CALL ENTRY TEST BYTE PTR [BX+4],80H JNZ FAILED MOV AH,52H INT 21H MOV AX,ES:[BX+22H] MOV WORD PTR DS:[BASE],AX MOV AX,ES:[BX+24H] MOV WORD PTR DS:[BASE+2],AX MOV ES:[BX+22H],OFFSET BASE MOV ES:[BX+24H],CS LDS SI,ES:[BX+16H] MOVZX AX,BYTE PTR CS:[DPB] MOV CX,58H MUL CX ADD SI,AX MOV BYTE PTR [SI+44H],40H MOV [SI+45H],OFFSET DPB MOV [SI+47H],CS MOV BYTE PTR [SI+4FH],2 PUSH CS POP DS LES BX,ES:[BX] FDEV: CMP WORD PTR ES:[BX+19H],0FFFFH JZ FNDDEV LES BX,ES:[BX+19H] JMP FDEV FNDDEV: MOV ES:[BX+19H],OFFSET DPB MOV ES:[BX+1BH],CS MOV AL,DS:[DPB] ADD AL,41H MOV DS:[GOOD1],AL MOV DX,OFFSET GOOD MOV AH,9 INT 21H MOV DX,WORD PTR DS:[REQ+0EH] INT 27H BADLTR: MOV DX,OFFSET BADLT MOV AH,9 INT 21H FAILED: MOV AX,10 RET GOOD DB 'R. LOEW 64-BIT RAMDISK Ver 1.0 (A-SE) Copyright (C) 2008, All Rights Reserved.',13,10,13,10 DB 'MOUNTED ON DRIVE ' GOOD1 DB 0,':',13,10,13,10,24H BADLT DB 'INVALID DRIVE LETTER',13,10,24H REQ DB 18H DUP(0) CODE ENDS END