; * * * ; DISCLAIMER ; ; A PARTITION TABLE IS REQUIRED ; TO BUILD A WORKING IMAGE ; ; PLEASE KNOW WHAT YOU ARE DOING ; * * * ; ; IDE PC Bootloader for 386+ ; ; Have Fun! ; use16 org 07C00h start: file "header.bin" ;OPTIONAL, to keep USB stick readable in AL,070h ; or AL,080h ; Turn NMI off out 070h,AL ; cli ;Disable interrupts cld ;ret => neat snippet! jmp 0:($+5) ;RealMode Init snippet mov AX,CS mov DS,AX mov ES,AX mov SS,AX mov SP,0600h ;500h-600h: Return Stack rdtsc ;Wait for keypress mov BX,DX inc BX db 066h,066h,090h ;Alignment TestLoop: in AL,064h ;Poll Keyboard test AL,01 jnz Pmode ;The byte(s) are still at 060h! rdtsc cmp BX,DX ;Wait four billion cycles jge TestLoop ;couple of seconds on my ;1.7GHz P4 mov SI,07C00h ;Relocate current code mov DI,07A00h mov CX,0256 rep movsw jmp (Boot-200h) db 066h,090h ;Alignment ;====================== LBAFetch: ;wired to master device lodsb out DX,AL inc DX lodsb out DX,AL inc DX lodsb out DX,AL inc DX lodsb or AL,0E0h ;LBA bit set, DEV bit clear out DX,AL ;or AL,0F0h for slave inc DX ret nop IDE_Idle: inc DH inc DH dec DL ;(Optional?) in AL,DX ;Wait one cycle by dec DH ;reading the corresponding dec DH ;alternate status register inc DL in AL,DX ;Status Register test AL,010000000b ;BSY? jnz IDE_Idle ;wait for it test AL,000001000b ;DRQ? jnz IDE_IdleRet ;proceed pop AX ;Break Loop nop ;Alignment IDE_IdleRet: sub DX, 07 ;Data Port ret Boot: in AL,070h ; and AL,07Fh ; Turn NMI on out 070h,AL ; sti ;Enable interrupts mov DI,07C00h ;Destination for data push DI ;and for return mov SI,07BC6h ;[SourceLBA] mov AX,01 ;SectorCount (0==256) mov DX,01F2h ;Base I/O address+2 MasterHDFetch: nop ;Alignment out DX,AL inc DX call LBAFetch db 066h,090h ;*Patch padding mov AL,020h ;"READ SECTOR(S)" command out DX,AL IDE_PIO_In: sub CX,CX ; 256 bytes inc CH ; at a time call IDE_Idle db 066h,066h,090h ;*Patch Padding rep insw ;16 bits wide bus add DX, 07 ;Status register jmp IDE_PIO_In ;================================================ Pmode: in AL,092h ; or AL,02 ; Enable the fast A20 gate out 080h,AL ; 1ms port read out 092h,AL ; mov BX,010h ;Load selector lgdt [GDT] ;Initialize the GDT mov EAX,CR0 inc AX mov CR0,EAX ;Enter PMode jmp 08:Protected ;Flush pipeline align 08 ;Optional, for speed GDT: ;Flat, minimal GDT dw 023 ; Blank descriptor dd GDT ; contains the GDT dw 0 ; pointer dw 0FFFFh,0,09A00h,0CFh ;32bit code descriptor dw 0FFFFh,0,09200h,0CFh ;32bit data descriptor Beurk: dd 01 use32 Protected: ;Now in 32 bit protected mode mov ES,EBX ; mov SS,EBX ; Initialize needed descriptors mov DS,EBX ; mov FS,EBX ;Alignment purpose ;Let's patch the backward calls of the 16 bits code!! mov dword [IDE_PIO_In+07],066F3FFFFh ;also insw fix sub dword [IDE_PIO_In+05],02 mov word [MasterHDFetch+06],0FFFFh sub word [MasterHDFetch+04],02 mov EDI,0100000h ;Destination for data push EDI ;and for return mov ESI,Beurk ;[SourceLBA] mov EAX,062 ;SectorCount (0==256) mov EDX,01F2h ;Base I/O address+2 jmp MasterHDFetch times (start+446-$) nop file "partable.bin" ;Partition Table of current drive ; ; ;=>PC Memory map at bootup (from OSD) ;=================== ;000000-0003FF interrupt vector table ;000400-0004FF BIOS data area ;000500-007BFF FREE CONVENTIONAL MEMORY ;007C00-007DFF boot sector ;007E00-09FBFF FREE CONVENTIONAL MEMORY ;09FC00-09FFFF extended BDA (variable length) ;0A0000-0FFFFF video memory and BIOS ROMs ;100000-10FFEF high memory area (HMA) ;10FFF0- FREE EXTENDED MEMORY ; ; ;*Only a complement to ATA/ATAPI-6 PDF document @ T13 ;Best webpage: http://www.stanford.edu/~csapuntz/ide.html ; ;=>IDE I/O ports Map (from EIDE-2 faq @ faqs.org) ;=================== ;10.4. How are the ATA(-2,PI) I/O ports assigned? ; ; The registers of the primary ATA channel occupy the following I/O ; addresses (in hexadecimal notation): ; ; Register Read Function Write Function ; ; 01F0h Read Data Write Data ; (16 Bits) (16 bits) ; 01F1h Error register Set Features Data ; 01F2h Status of sector Write sector count ; count for command setup ; 01F3h Location of starting Write sector start ; sector for command setup ; 01F4h Location of Cyl-low Write cyl-low location ; for command setup ; 01F5h Location of Cyl-high Write cyl-high location ; for command setup ; 01F6h Head/device selection Write device selection ; and head selection for ; command setup ; 01F7h Device Status Device command ; ; 03F6h Alternate Status Device Control ; 03F7h Drive Address ; ; Note that the floppy disk controller's disk change flag shares 03F7h ; which makes life difficult for designers that want to implement disk ; and floppy controllers separately. [...] ; ; Interface number CS0-decode CS1-decode IRQ number ; ; 1 01F0h-01F7h 03F6h-03F7h 14 ; 2 0170h-0177h 0376h-0377h 15 or 10 ; 3 01E8h-01EFh 03EEh-03EFh 12 or 11 ; 4 0168h-016Fh 036Eh-036Fh 10 or 9 ; ;=> Keyboard Scancode set 1 (from OSD) ; ;Most keys: ; one-byte make code = nn ; one-byte repeat code = nn ; one-byte break code = 80h + nn ; ;"Gray" keys (not on original 84-key keyboard): ; two-byte make code = E0nn ; two-byte repeat code = E0nn ; two-byte break code = E0 followed by 80h + nn ; ;code key code key code key code key ;---- --- ---- --- ---- --- ---- --- ;01 Esc 0F Tab 1D L Ctrl 2B \| ;02 1! 10 Q 1E A 2C Z ;03 2" 11 W 1F S 2D X ;04 3# 12 E 20 D 2E C ;05 4$ 13 R 21 F 2F V ;06 5% 14 T 22 G 30 B ;07 6^ 15 Y 23 H 31 N ;08 7& 16 U 24 J 32 M ;09 8* 17 I 25 K 33 ,< ;0A 9( 18 O 26 L 34 .> ;0B 0) 19 P 27 ;: 35 /? ;0C -_ 1A [{ 28 '" 36 R Shift ;0D =+ 1B ]} 29 `~ 37 * ;0E BackSpace 1C Enter 2A L Shift 38 L Alt ; ;code key code key code key code key ;---- --- ---- --- ---- --- ---- --- ;39 Space 41 F7 49 PageUp 9 51 PageDown 3 ;3A CapsLock 42 F8 4A - 52 Insert 0 ;3B F1 43 F9 4B (left) 4 53 Del . ;3C F2 44 F10 4C 5 ;3D F3 45 NumLock 4D (right) 6 57 F11 ;3E F4 46 ScrollLock 4E + 58 F12 ;3F F5 47 Home 7 4F End 1 ;40 F6 48 (up) 8 50 (down) 2 ; ;code key ;---- --- ;E01C Enter (on numeric keypad) ;E01D R Ctrl ;E02A make code prefix for keyboard internal numlock ;E02AE037 PrintScreen make code ;E035 / ;E037 PrintScreen repeat code ;E038 R Alt ;E047 Home ;E048 (up) ;E049 PageUp ;E04B (left) ;E04D (right) ;E04F End ;E050 (down) ;E051 PageDown ;E052 Insert ;E053 Del ;E05B L Win ;E05C R Win ;E05D Menu ;E0AA break code suffix for keyboard internal numlock ;E0B7E0AA PrintScreen break code ;E11D45E19DC5 Pause ;