win7 sp1 mbr.asm
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; Input MD5 : 526310D6B6734D0959C7ECFD0BF97E0D; Input CRC32 : 0F847F65; Load in 0000h:7C00h; ss:sp = 0000h:0400h, ds = 0040h (BIOS data area); Memory layout:; 0000:0000 - 0000:0FFF: Interrupt vector table & BIOS data; 0000:1000 - 0000:6FFF: Real mode stack area; 0000:7000 - 0000:7FFF: Cmdline (multiboot); 0000:8000 - xxxx:xxxx: FreeLoader program & data area; xxxx:xxxx - 7000:7FFF: Random memory allocation heap; 7000:8000 - 7000:FFFF: Protected mode stack area; 8000:0000 - 8000:FFFF: File system read buffer; 9000:0000 - 9000:FFFF: Disk read buffer for BIOS Int 13h; A000:0000 - FFFF:FFFF: reservedorg 7c00h0600 xor ax, ax ; ax = 00602 mov ss, ax ; ss = 00604 mov sp, 7C00h ; sp = 7C00h0607 mov es, ax ; es = 00609 mov ds, ax ; ds = 0060B mov si, 7C00h ; si = 7C00h060E mov di, 600h ; di = 600h0611 mov cx, 200h ; cx = 200h0614 cld ; df = 00615 rep movsb ; ds:si = es:di0617 push ax0618 push 61Ch ; jump to 61Ch061B retf ; ---------------------------------------------------------------------------061C sti ; df = 1061D mov cx, 4 ; cx = 40620 mov bp, 7BEh ; bp = 7BEh0623 ; 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ; BI SH SS SC ID EH ES EC L0 L1 L2 L3 S0 S1 S2 S3 ;1BE 00 20 21 00 07 AA 28 82 00 08 00 00 00 00 20 00 ;1CE 80 AA 29 82 07 FE FF FF 00 08 20 00 00 28 80 07 ;1DE 00 FE FF FF 0F FE FF FF 00 38 A0 07 00 A8 A2 1D ;1EE 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ;1FE 55 AA0623 _CheckPTBHead: ; CODE XREF: seg000:0630j0623 cmp byte ptr [bp+0], 00627 jl short loc_634 ; if bp < 0 jmp 6340629 jnz _InvalidPTB ; if bp != 0 jmp _InvalidPTB062D add bp, 10h ; bp += 10h0630 loop _CheckPTBHead ; loop0632 int 18h ; TRANSFER TO ROM BASIC0632 ; causes transfer to ROM-based BASIC (IBM-PC)0632 ; often reboots a compatible ; often has no effect at all06340634 loc_634: ; CODE XREF: seg000:0627j0634 ; seg000:06AEj0634 mov [bp+0], dl0637 push bp0638 mov byte ptr [bp+11h], 5063C mov byte ptr [bp+10h], 00640 mov ah, 41h0642 mov bx, 55AAh0645 int 13h ; DISK - Check for INT 13h Extensions0645 ; BX = 55AAh, DL = drive number0645 ; Return: CF set if not supported0645 ; AH = extensions version0645 ; BX = AA55h0645 ; CX = Interface support bit map0647 pop bp0648 jb short loc_659064A cmp bx, 0AA55h064E jnz short loc_6590650 test cx, 10654 jz short loc_6590656 inc byte ptr [bp+10h]06590659 loc_659: ; CODE XREF: seg000:0648j0659 ; seg000:064Ej ...0659 pushad065B cmp byte ptr [bp+10h], 0065F jz short loc_6870661 push large 00667 push large dword ptr [bp+8]066B push 0066E push 7C00h0671 push 10674 push 10h0677 mov ah, 42h0679 mov dl, [bp+0]067C mov si, sp067E int 13h ; DISK - IBM/MS Extension - EXTENDED READ (DL - drive, DS:SI - disk address packet)0680 lahf0681 add sp, 10h0684 sahf0685 jmp short loc_69B0687 ; ---------------------------------------------------------------------------06870687 loc_687: ; CODE XREF: seg000:065Fj0687 mov ax, 201h068A mov bx, 7C00h068D mov dl, [bp+0]0690 mov dh, [bp+1]0693 mov cl, [bp+2]0696 mov ch, [bp+3]0699 int 13h ; DISK - READ SECTORS INTO MEMORY0699 ; AL = number of sectors to read, CH = track, CL = sector0699 ; DH = head, DL = drive, ES:BX -> buffer to fill0699 ; Return: CF set on error, AH = status, AL = number of sectors read069B069B loc_69B: ; CODE XREF: seg000:0685j069B popad069D jnb short loc_6BB069F dec byte ptr [bp+11h]06A2 jnz short loc_6B006A4 cmp byte ptr [bp+0], 80h06A8 jz _ErrorLoadingOS06AC mov dl, 80h06AE jmp short loc_63406B0 ; ---------------------------------------------------------------------------06B006B0 loc_6B0: ; CODE XREF: seg000:06A2j06B0 push bp06B1 xor ah, ah06B3 mov dl, [bp+0]06B6 int 13h ; DISK - RESET DISK SYSTEM06B6 ; DL = drive (if bit 7 is set both hard disks and floppy disks reset)06B8 pop bp06B9 jmp short loc_65906BB ; ---------------------------------------------------------------------------06BB06BB loc_6BB: ; CODE XREF: seg000:069Dj06BB cmp word ptr ds:7DFEh, 0AA55h06C1 jnz short _MissingOS06C3 push word ptr [bp+0]06C6 call sub_75606C9 jnz short loc_6E206CB cli06CC mov al, 0D1h06CE out 64h, al ; 8042 keyboard controller command register.06CE ; Write output port (next byte to port 60h):06CE ; 7: 1=keyboard data line pulled low (inhibited)06CE ; 6: 1=keyboard clock line pulled low (inhibited)06CE ; 5: enables IRQ 12 interrupt on mouse IBF06CE ; 4: enables IRQ 1 interrupt on keyboard IBF06CE ; 3: 1=mouse clock line pulled low (inhibited)06CE ; 2: 1=mouse data line pulled low (inhibited)06CE ; 1: A20 gate on/off06CE ; 0: reset the PC (THIS BIT SHOULD ALWAYS BE SET TO 1)06D0 call sub_75606D3 mov al, 0DFh06D5 out 60h, al ; 8042 keyboard controller data register.06D7 call sub_75606DA mov al, 0FFh06DC out 64h, al ; 8042 keyboard controller command register.06DC ; Pulse output port.06DC ; Bits 0-3 indicate ports to pulse.06DE call sub_75606E1 sti06E206E2 loc_6E2: ; CODE XREF: seg000:06C9j06E2 mov ax, 0BB00h06E5 int 1Ah ; Trusted Computing Group call - TCG_StatusCheck06E5 ; Return: EAX = 0 if supported06E5 ; EBX = 41504354h ('TCPA')06E5 ; CH:CL = TCG BIOS Version06E5 ; EDX = BIOS TCG Feature Flags06E5 ; ESI = Pointer to Event Log06E5 ;06E7 and eax, eax06EA jnz short loc_72706EC cmp ebx, 41504354h06F3 jnz short loc_72706F5 cmp cx, 102h06F9 jb short loc_72706FB push large 0BB07h0701 push large 200h0707 push large 8070D push ebx070F push ebx0711 push ebp0713 push large 00719 push large 7C00h071F popad0721 push 00724 pop es0725 int 1Ah ; Trusted Computing Group call - TCG_StatusCheck0725 ; Return: EAX = 0 if supported0725 ; EBX = 41504354h ('TCPA')0725 ; CH:CL = TCG BIOS Version0725 ; EDX = BIOS TCG Feature Flags0725 ; ESI = Pointer to Event Log0725 ;07270727 loc_727: ; CODE XREF: seg000:06EAj0727 ; seg000:06F3j ...0727 pop dx0728 xor dh, dh072A jmp far ptr 0:7C00h072F ; ---------------------------------------------------------------------------072F int 18h ; TRANSFER TO ROM BASIC072F ; causes transfer to ROM-based BASIC (IBM-PC)072F ; often reboots a compatible ; often has no effect at all0731 ; Missing operating system0731 _MissingOS: ; CODE XREF: seg000:06C1j0731 mov al, ds:byte_7B7 ; al = 9Ah0734 jmp short _ShowMessage0736 ; ---------------------------------------------------------------------------0736 ; Error loading operating system0736 _ErrorLoadingOS: ; CODE XREF: seg000:06A8j0736 mov al, ds:byte_7B6 ; al = 7Bh0739 jmp short _ShowMessage073B ; ---------------------------------------------------------------------------073B ; Invalid partition table073B _InvalidPTB: ; CODE XREF: seg000:0629j ax = 0073B mov al, ds:byte_7B5 ; al = 63h073E073E _ShowMessage: ; CODE XREF: seg000:0734j073E ; seg000:0739j073E xor ah, ah ; ah = 00740 add ax, 700h ; ax = al + 700h0743 mov si, ax ; si = ax07450745 _DisplayMessage: ; CODE XREF: seg000:0751j0745 lodsb0746 cmp al, 00748 jz short _Halt074A mov bx, 7074D mov ah, 0Eh074F int 10h ; - VIDEO - WRITE CHARACTER AND ADVANCE CURSOR (TTY WRITE)074F ; AL = character, BH = display page (alpha modes)074F ; BL = foreground color (graphics modes)0751 jmp short _DisplayMessage0753 ; ---------------------------------------------------------------------------07530753 _Halt: ; CODE XREF: seg000:0748j0753 ; seg000:0754j0753 hlt0754 ; ---------------------------------------------------------------------------0754 jmp short _Halt07560756 ; =============== S U B R O U T I N E =======================================075607560756 sub_756 proc near ; CODE XREF: seg000:06C6p0756 ; seg000:06D0p ...0756 sub cx, cx07580758 loc_758: ; CODE XREF: sub_756+8j0758 in al, 64h ; 8042 keyboard controller status register0758 ; 7: PERR 1=parity error in data received from keyboard0758 ; +----------- AT Mode ----------+------------ PS/2 Mode ------------+0758 ; 6: |RxTO receive (Rx) timeout | TO general timeout (Rx or Tx)|0758 ; 5: |TxTO transmit (Tx) timeout | MOBF mouse output buffer full |0758 ; +------------------------------+-----------------------------------+0758 ; 4: INH 0=keyboard communications inhibited0758 ; 3: A2 0=60h was the port last written to, 1=64h was last0758 ; 2: SYS distinguishes reset types: 0=cold reboot, 1=warm reboot0758 ; 1: IBF 1=input buffer full (keyboard can't accept data)0758 ; 0: OBF 1=output buffer full (data from keyboard is available)075A jmp short $+2075C and al, 2075E loopne loc_7580760 and al, 20762 retn0762 sub_756 endp07620762 ; ---------------------------------------------------------------------------0763 db 49h ; I Invalid partition table0764 db 6Eh ; n0765 db 76h ; v0766 db 61h ; a0767 db 6Ch ; l0768 db 69h ; i0769 db 64h ; d076A db 20h076B db 70h ; p076C db 61h ; a076D db 72h ; r076E db 74h ; t076F db 69h ; i0770 db 74h ; t0771 db 69h ; i0772 db 6Fh ; o0773 db 6Eh ; n0774 db 20h0775 db 74h ; t0776 db 61h ; a0777 db 62h ; b0778 db 6Ch ; l0779 db 65h ; e077A db 0077B db 45h ; E Error loading operating system077C db 72h ; r077D db 72h ; r077E db 6Fh ; o077F db 72h ; r0780 db 20h0781 db 6Ch ; l0782 db 6Fh ; o0783 db 61h ; a0784 db 64h ; d0785 db 69h ; i0786 db 6Eh ; n0787 db 67h ; g0788 db 20h0789 db 6Fh ; o078A db 70h ; p078B db 65h ; e078C db 72h ; r078D db 61h ; a078E db 74h ; t078F db 69h ; i0790 db 6Eh ; n0791 db 67h ; g0792 db 20h0793 db 73h ; s0794 db 79h ; y0795 db 73h ; s0796 db 74h ; t0797 db 65h ; e0798 db 6Dh ; m0799 db 0079A db 4Dh ; M Missing operating system079B db 69h ; i079C db 73h ; s079D db 73h ; s079E db 69h ; i079F db 6Eh ; n07A0 db 67h ; g07A1 db 20h07A2 db 6Fh ; o07A3 db 70h ; p07A4 db 65h ; e07A5 db 72h ; r07A6 db 61h ; a07A7 db 74h ; t07A8 db 69h ; i07A9 db 6Eh ; n07AA db 67h ; g07AB db 20h07AC db 73h ; s07AD db 79h ; y07AE db 73h ; s07AF db 74h ; t07B0 db 65h ; e07B1 db 6Dh ; m07B2 db 007B3 db 007B4 db 007B5 byte_7B5 db 63h ; DATA XREF: seg000:_InvalidPTBr07B6 byte_7B6 db 7Bh ; DATA XREF: seg000:_ErrorLoadingOSr07B7 byte_7B7 db 9Ah ; DATA XREF: seg000:_MissingOSr07B8 db 007B9 db 007BA db 007BB db 007BC db 007BD db 007BE db 0 ; partition 107BF db 007C0 db 007C1 db 007C2 db 007C3 db 007C4 db 007C5 db 007C6 db 007C7 db 007C8 db 007C9 db 007CA db 007CB db 007CC db 007CD db 007CE db 0 ; partition 207CF db 007D0 db 007D1 db 007D2 db 007D3 db 007D4 db 007D5 db 007D6 db 007D7 db 007D8 db 007D9 db 007DA db 007DB db 007DC db 007DD db 007DE db 0 ; partition 307DF db 007E0 db 007E1 db 007E2 db 007E3 db 007E4 db 007E5 db 007E6 db 007E7 db 007E8 db 007E9 db 007EA db 007EB db 007EC db 007ED db 007EE db 0 ; partition 407EF db 007F0 db 007F1 db 007F2 db 007F3 db 007F4 db 007F5 db 007F6 db 007F7 db 007F8 db 007F9 db 007FA db 007FB db 007FC db 007FD db 007FE db 55h07FF db 0AAh07FF end阅读全文
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