;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;; ;; Copyright (C) MenuetOS 2000-2004 Ville Mikael Turjanmaa ;; ;; Distributed under terms of the GNU General Public License ;; ;; ;; ;; BOOTCODE.INC ;; ;; ;; ;; KolibriOS 16-bit loader, ;; ;; based on bootcode for MenuetOS ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; $Revision: 1018 $ ;========================================================================== ; ; 16 BIT FUNCTIONS ; ;========================================================================== putchar: ; in: al=character mov ah, 0Eh mov bh, 0 int 10h ret print: ; in: si->string mov al, 186 call putchar mov al, ' ' call putchar printplain: ; in: si->string pusha lodsb @@: call putchar lodsb cmp al, 0 jnz @b popa ret getkey: ; get number in range [bl,bh] (bl,bh in ['0'..'9']) ; in: bx=range ; out: ax=digit (1..9, 10 for 0) mov ah, 0 int 16h cmp al, bl jb getkey cmp al, bh ja getkey push ax call putchar pop ax and ax, 0Fh jnz @f mov al, 10 @@: ret setcursor: ; in: dl=column, dh=row mov ah, 2 mov bh, 0 int 10h ret macro _setcursor row,column { mov dx, row*256 + column call setcursor } boot_read_floppy: push si xor si, si mov ah, 2 ; read @@: push ax int 0x13 pop ax jnc @f inc si cmp si, 10 jb @b mov si, badsect sayerr_plain: call printplain jmp $ @@: pop si ret ; convert abs. sector number (AX) to BIOS T:H:S ; sector number = (abs.sector%BPB_SecPerTrk)+1 ; pre.track number = (abs.sector/BPB_SecPerTrk) ; head number = pre.track number%BPB_NumHeads ; track number = pre.track number/BPB_NumHeads ; Return: cl - sector number ; ch - track number ; dl - drive number (0 = a:) ; dh - head number conv_abs_to_THS: push bx mov bx,word [BPB_SecPerTrk] xor dx,dx div bx inc dx mov cl, dl ; cl = sector number mov bx,word [BPB_NumHeads] xor dx,dx div bx ; !!!!!!! ax = track number, dx = head number mov ch,al ; ch=track number xchg dh,dl ; dh=head number mov dl,0 ; dl=0 (drive 0 (a:)) pop bx retn ; needed variables BPB_SecPerTrk dw 0 ; sectors per track BPB_NumHeads dw 0 ; number of heads BPB_FATSz16 dw 0 ; size of FAT BPB_RootEntCnt dw 0 ; count of root dir. entries BPB_BytsPerSec dw 0 ; bytes per sector BPB_RsvdSecCnt dw 0 ; number of reserved sectors BPB_TotSec16 dw 0 ; count of the sectors on the volume BPB_SecPerClus db 0 ; number of sectors per cluster BPB_NumFATs db 0 ; number of FAT tables abs_sector_adj dw 0 ; adjustment to make abs. sector number end_of_FAT dw 0 ; end of FAT table FirstDataSector dw 0 ; begin of data ;========================================================================= ; ; 16 BIT CODE ; ;========================================================================= include 'bootvesa.inc' ;Include source for boot vesa start_of_code: cld ; \begin{diamond}[02.12.2005] ; if bootloader sets ax = 'KL', then ds:si points to loader block cmp ax, 'KL' jnz @f mov word [cs:cfgmanager.loader_block], si mov word [cs:cfgmanager.loader_block+2], ds @@: ; \end{diamond}[02.12.2005] ; if bootloader sets cx = 'HA' and dx = 'RD', then bx contains identifier of source hard disk ; (see comment to bx_from_load) cmp cx, 'HA' jnz no_hd_load cmp dx,'RD' jnz no_hd_load mov word [cs:bx_from_load], bx ; {SPraid}[13.03.2007] no_hd_load: ; set up stack mov ax, 3000h mov ss, ax mov sp, 0EC00h ; set up segment registers push cs pop ds push cs pop es ; set videomode mov ax, 3 int 0x10 if lang eq ru ; Load & set russian VGA font (RU.INC) mov bp, RU_FNT1 ; RU_FNT1 - First part mov bx, 1000h ; 768 bytes mov cx, 30h ; 48 symbols mov dx, 80h ; 128 - position of first symbol mov ax, 1100h int 10h mov bp, RU_FNT2 ; RU_FNT2 -Second part mov bx, 1000h ; 512 bytes mov cx, 20h ; 32 symbols mov dx, 0E0h ; 224 - position of first symbol mov ax, 1100h int 10h ; End set VGA russian font else if lang eq et mov bp, ET_FNT ; ET_FNT1 mov bx, 1000h ; mov cx, 255 ; 256 symbols xor dx, dx ; 0 - position of first symbol mov ax, 1100h int 10h end if ; draw frames push 0xb800 pop es xor di, di mov ah, 1*16+15 ; draw top mov si, d80x25_top mov cx, d80x25_top_num * 80 @@: lodsb stosw loop @b ; draw spaces mov si, space_msg mov dx, 25 - d80x25_top_num - d80x25_bottom_num dfl1: push si mov cx, 80 @@: lodsb stosw loop @b pop si dec dx jnz dfl1 ; draw bottom mov si, d80x25_bottom mov cx, d80x25_bottom_num * 80 @@: lodsb stosw loop @b mov byte [space_msg+80], 0 ; now space_msg is null terminated _setcursor d80x25_top_num,0 ; TEST FOR 386+ mov bx, 0x4000 pushf pop ax mov dx, ax xor ax, bx push ax popf pushf pop ax and ax, bx and dx, bx cmp ax, dx jnz cpugood mov si, not386 sayerr: call print jmp $ cpugood: push 0 popf sti ; set up esp movzx esp, sp push 0 pop es and word [es:0x9031], 0 ; \begin{Mario79} ; find HDD IDE DMA PCI device ; check for PCI BIOS mov ax, 0xB101 int 0x1A jc .nopci cmp edx, 'PCI ' jnz .nopci ; find PCI class code ; class 1 = mass storage ; subclass 1 = IDE controller ; a) class 1, subclass 1, programming interface 0x80 mov ax, 0xB103 mov ecx, 1*10000h + 1*100h + 0x80 xor si, si ; device index = 0 int 0x1A jnc .found ; b) class 1, subclass 1, programming interface 0x8A mov ax, 0xB103 mov ecx, 1*10000h + 1*100h + 0x8A xor si, si ; device index = 0 int 0x1A jnc .found ; c) class 1, subclass 1, programming interface 0x85 mov ax, 0xB103 mov ecx, 1*10000h + 1*100h + 0x85 xor si, si int 0x1A jc .nopci .found: ; get memory base mov ax, 0xB10A mov di, 0x20 ; memory base is config register at 0x20 int 0x1A jc .nopci and cx, 0xFFF0 ; clear address decode type mov [es:0x9031], cx .nopci: ; \end{Mario79} mov al, 0xf6 ; Ñáðîñ êëàâèàòóðû, ðàçðåøèòü ñêàíèðîâàíèå out 0x60, al xor cx, cx wait_loop: ; variant 2 ; reading state of port of 8042 controller in al, 64h and al, 00000010b ; ready flag ; wait until 8042 controller is ready loopnz wait_loop ;;;/diamond today 5.02.2008 ; set keyboard typematic rate & delay mov al, 0xf3 out 0x60, al xor cx, cx @@: in al, 64h test al, 2 loopnz @b mov al, 0 out 0x60, al xor cx, cx @@: in al, 64h test al, 2 loopnz @b ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; --------------- APM --------------------- and word [es:0x9044], 0 ; ver = 0.0 (APM not found) mov ax, 0x5300 xor bx, bx int 0x15 jc apm_end ; APM not found test cx, 2 jz apm_end ; APM 32-bit protected-mode interface not supported mov [es:0x9044], ax ; Save APM Version mov [es:0x9046], cx ; Save APM flags ; Write APM ver ---- and ax, 0xf0f add ax, '00' mov si, msg_apm mov [si + 5], ah mov [si + 7], al _setcursor 0, 3 call printplain ; ------------------ mov ax, 0x5304 ; Disconnect interface xor bx, bx int 0x15 mov ax, 0x5303 ; Connect 32 bit mode interface xor bx, bx int 0x15 mov [es:0x9040], ebx mov [es:0x9050], ax mov [es:0x9052], cx mov [es:0x9054], dx apm_end: _setcursor d80x25_top_num, 0 ;CHECK current of code cmp [cfgmanager.loader_block], -1 jz noloaderblock les bx, [cfgmanager.loader_block] cmp byte [es:bx], 1 mov si, loader_block_error jnz sayerr push 0 pop es noloaderblock: ; DISPLAY VESA INFORMATION call print_vesa_info call calc_vmodes_table call check_first_parm ;check and enable cursor_pos ; \begin{diamond}[30.11.2005] cfgmanager: ; settings: ; a) preboot_graph = graphical mode ; preboot_gprobe = probe this mode? ; b) preboot_dma = use DMA access? ; c) preboot_vrrm = use VRR? ; d) preboot_device = from what boot? ; determine default settings mov [.bSettingsChanged], 0 ;.preboot_gr_end: mov di, preboot_device ; if image in memory is present and [preboot_device] is uninitialized, ; set it to use this preloaded image cmp byte [di], 0 jnz .preboot_device_inited cmp [.loader_block], -1 jz @f les bx, [.loader_block] test byte [es:bx+1], 1 jz @f mov byte [di], 3 jmp .preboot_device_inited @@: ; otherwise, set [preboot_device] to 1 (default value - boot from floppy) mov byte [di], 1 .preboot_device_inited: ; following 4 lines set variables to 1 if its current value is 0 cmp byte [di+preboot_dma-preboot_device], 1 adc byte [di+preboot_dma-preboot_device], 0 cmp byte [di+preboot_biosdisk-preboot_device], 1 adc byte [di+preboot_biosdisk-preboot_device], 0 ; default value for VRR is OFF cmp byte [di+preboot_vrrm-preboot_device], 0 jnz @f mov byte [di+preboot_vrrm-preboot_device], 2 @@: ; notify user _setcursor 5,2 mov si, linef call printplain mov si, start_msg call print mov si, time_msg call print ; get start time call .gettime mov [.starttime], eax mov word [.timer], .newtimer mov word [.timer+2], cs .printcfg: _setcursor 9,0 mov si, current_cfg_msg call print mov si, curvideo_msg call print call draw_current_vmode mov si, usebd_msg cmp [preboot_biosdisk], 1 call .say_on_off mov si, vrrm_msg cmp [preboot_vrrm], 1 call .say_on_off mov si, preboot_device_msg call print mov al, [preboot_device] and eax, 7 mov si, [preboot_device_msgs+eax*2] call printplain .show_remarks: ; show remarks in gray color mov di, ((21-num_remarks)*80 + 2)*2 push 0xB800 pop es mov cx, num_remarks mov si, remarks .write_remarks: lodsw push si xchg ax, si mov ah, 1*16+7 ; background: blue (1), foreground: gray (7) push di .write_remark: lodsb test al, al jz @f stosw jmp .write_remark @@: pop di pop si add di, 80*2 loop .write_remarks .wait: _setcursor 25,0 ; out of screen ; set timer interrupt handler cli push 0 pop es push dword [es:8*4] pop dword [.oldtimer] push dword [.timer] pop dword [es:8*4] ; mov eax, [es:8*4] ; mov [.oldtimer], eax ; mov eax, [.timer] ; mov [es:8*4], eax sti ; wait for keypressed xor ax,ax int 16h push ax ; restore timer interrupt ; push 0 ; pop es mov eax, [.oldtimer] mov [es:8*4], eax mov [.timer], eax _setcursor 7,0 mov si, space_msg call printplain ; clear remarks and restore normal attributes push es mov di, ((21-num_remarks)*80 + 2)*2 push 0xB800 pop es mov cx, num_remarks mov ax, ' ' + (1*16 + 15)*100h @@: push cx mov cx, 76 rep stosw pop cx add di, 4*2 loop @b pop es pop ax ; switch on key cmp al, 13 jz .continue or al, 20h cmp al, 'a' jz .change_a cmp al, 'b' jz .change_b cmp al, 'c' jz .change_c cmp al, 'd' jnz .show_remarks _setcursor 15,0 mov si, bdev call print mov bx, '14' call getkey mov [preboot_device], al _setcursor 13,0 .d: mov [.bSettingsChanged], 1 call clear_vmodes_table ;clear vmodes_table jmp .printcfg .change_a: .loops: call draw_vmodes_table _setcursor 25,0 ; out of screen xor ax,ax int 0x16 ; call clear_table_cursor ;clear current position of cursor mov si,word [cursor_pos] cmp ah,0x48;x,0x48E0 ; up jne .down cmp si,modes_table jbe .loops sub word [cursor_pos],size_of_step jmp .loops .down: cmp ah,0x50;x,0x50E0 ; down jne .pgup cmp word[es:si+10],-1 je .loops add word [cursor_pos],size_of_step jmp .loops .pgup: cmp ah,0x49 ; page up jne .pgdn sub si, size_of_step*long_v_table cmp si, modes_table jae @f mov si, modes_table @@: mov word [cursor_pos], si mov si, word [home_cursor] sub si, size_of_step*long_v_table cmp si, modes_table jae @f mov si, modes_table @@: mov word [home_cursor], si jmp .loops .pgdn: cmp ah,0x51 ; page down jne .enter mov ax, [end_cursor] add si, size_of_step*long_v_table cmp si, ax jb @f mov si, ax sub si, size_of_step @@: mov word [cursor_pos], si mov si, word [home_cursor] sub ax, size_of_step*long_v_table add si, size_of_step*long_v_table cmp si, ax jb @f mov si, ax @@: mov word [home_cursor], si jmp .loops .enter: cmp al,0x0D;x,0x1C0D ; enter jne .loops push word [cursor_pos] pop bp push word [es:bp] pop word [x_save] push word [es:bp+2] pop word [y_save] push word [es:bp+6] pop word [number_vm] mov word [preboot_graph],bp ;save choose jmp .d .change_b: _setcursor 15,0 ; mov si, ask_dma ; call print ; mov bx, '13' ; call getkey ; mov [preboot_dma], al mov si, ask_bd call print mov bx, '12' call getkey mov [preboot_biosdisk], al _setcursor 11,0 jmp .d .change_c: _setcursor 15,0 mov si, vrrmprint call print mov bx, '12' call getkey mov [preboot_vrrm], al _setcursor 12,0 jmp .d ;;;;;;;;;;;;;;;;;;;;;;;;;;;; .say_on_off: pushf call print mov si, on_msg popf jz @f mov si, off_msg @@: jmp printplain ; novesa and vervesa strings are not used at the moment of executing this code virtual at novesa .oldtimer dd ? .starttime dd ? .bSettingsChanged db ? .timer dd ? end virtual .loader_block dd -1 .gettime: mov ah, 0 int 1Ah xchg ax, cx shl eax, 10h xchg ax, dx ret .newtimer: push ds push cs pop ds pushf call [.oldtimer] pushad call .gettime sub eax, [.starttime] sub ax, 18*5 jae .timergo neg ax add ax, 18-1 mov bx, 18 xor dx, dx div bx if lang eq ru ; ¯®¤®¦¤¨â¥ 5 ᥪ㭤, 4/3/2 ᥪ㭤ë, 1 ᥪ㭤ã cmp al, 5 mov cl, ' ' jae @f cmp al, 1 mov cl, 'ã' jz @f mov cl, 'ë' @@: mov [time_str+9], cl else if lang eq et cmp al, 1 ja @f mov [time_str+9], ' ' mov [time_str+10],' ' @@: else ; wait 5/4/3/2 seconds, 1 second cmp al, 1 mov cl, 's' ja @f mov cl, ' ' @@: mov [time_str+9], cl end if add al, '0' mov [time_str+1], al mov si, time_msg _setcursor 7,0 call print _setcursor 25,0 popad pop ds iret .timergo: push 0 pop es mov eax, [.oldtimer] mov [es:8*4], eax mov sp, 0EC00h .continue: sti _setcursor 6,0 mov si, space_msg call printplain call printplain _setcursor 6,0 mov si, loading_msg call print _setcursor 15,0 cmp [.bSettingsChanged], 0 jz .load cmp [.loader_block], -1 jz .load les bx, [.loader_block] mov eax, [es:bx+3] push ds pop es test eax, eax jz .load push eax mov si, save_quest call print .waityn: mov ah, 0 int 16h or al, 20h cmp al, 'n' jz .loadc cmp al, 'y' jnz .waityn call putchar mov byte [space_msg+80], 186 pop eax push cs push .cont push eax retf ;call back .loadc: pop eax .cont: push cs pop ds mov si, space_msg mov byte [si+80], 0 _setcursor 15,0 call printplain _setcursor 15,0 .load: ; \end{diamond}[02.12.2005] ; ASK GRAPHICS MODE call set_vmode ; GRAPHICS ACCELERATION ; force yes mov [es:0x901C], byte 1 ; DMA ACCESS TO HD mov al, [preboot_dma] mov [es:0x901F], al ; VRR_M USE mov al,[preboot_vrrm] mov [es:0x9030], al mov [es:0x901E], byte 1 ; BOOT DEVICE mov al, [preboot_device] dec al mov [boot_dev], al ; READ DISKETTE TO MEMORY ; cmp [boot_dev],0 jne no_sys_on_floppy mov si,diskload call print xor ax, ax ; reset drive xor dx, dx int 0x13 ; do we boot from CD-ROM? mov ah, 41h mov bx, 55AAh xor dx, dx int 0x13 jc .nocd cmp bx, 0AA55h jnz .nocd mov ah, 48h push ds push es pop ds mov si, 0xa000 mov word [si], 30 int 0x13 pop ds jc .nocd push ds lds si, [es:si+26] test byte [ds:si+10], 40h pop ds jz .nocd ; yes - read all floppy by 18 sectors ; TODO: !!!! read only first sector and set variables !!!!! ; ... ; TODO: !!! then read flippy image track by track mov cx, 0x0001 ; startcyl,startsector .a1: push cx dx mov al, 18 mov bx, 0xa000 call boot_read_floppy mov si, movedesc push es push ds pop es mov cx, 256*18 mov ah, 0x87 int 0x15 pop es pop dx cx test ah, ah jnz sayerr_floppy add dword [si+8*3+2], 512*18 inc dh cmp dh, 2 jnz .a1 mov dh, 0 inc ch cmp ch, 80 jae ok_sys_on_floppy pusha mov al, ch shr ch, 2 add al, ch aam xchg al, ah add ax, '00' mov si, pros mov [si], ax call printplain popa jmp .a1 .nocd: ; no - read only used sectors from floppy ; now load floppy image to memory ; at first load boot sector and first FAT table ; read only first sector and fill variables mov cx, 0x0001 ; first logical sector xor dx, dx ; head = 0, drive = 0 (a:) mov al, 1 ; read one sector mov bx, 0xB000 ; es:bx -> data area call boot_read_floppy ; fill the necessary parameters to work with a floppy mov ax, word [es:bx+24] mov word [BPB_SecPerTrk], ax mov ax, word [es:bx+26] mov word [BPB_NumHeads], ax mov ax, word [es:bx+17] mov word [BPB_RootEntCnt], ax mov ax, word [es:bx+14] mov word [BPB_RsvdSecCnt], ax mov ax, word [es:bx+19] mov word [BPB_TotSec16], ax mov al, byte [es:bx+13] mov byte [BPB_SecPerClus], al mov al, byte [es:bx+16] mov byte [BPB_NumFATs], al ; 18.11.2008 mov ax, word [es:bx+22] mov word [BPB_FATSz16], ax mov cx, word [es:bx+11] mov word [BPB_BytsPerSec], cx ; count of clusters in FAT12 ((size_of_FAT*2)/3) ; mov ax, word [BPB_FATSz16] ; mov cx, word [BPB_BytsPerSec] ;end 18.11.2008 xor dx, dx mul cx shl ax, 1 mov cx, 3 div cx ; now ax - number of clusters in FAT12 mov word [end_of_FAT], ax ; load first FAT table mov cx, 0x0002 ; startcyl,startsector ; TODO!!!!! xor dx, dx ; starthead,drive mov al, byte [BPB_FATSz16] ; no of sectors to read add bx, word [BPB_BytsPerSec] ; es:bx -> data area call boot_read_floppy mov bx, 0xB000 ; and copy them to extended memory mov si, movedesc mov [si+8*2+3], bh ; from mov ax, word [BPB_BytsPerSec] shr ax, 1 ; words per sector mov cx, word [BPB_RsvdSecCnt] add cx, word [BPB_FATSz16] mul cx push ax ; save to stack count of words in boot+FAT xchg ax, cx push es push ds pop es mov ah, 0x87 int 0x15 pop es test ah, ah jz @f sayerr_floppy: mov dx, 0x3f2 mov al, 0 out dx, al mov si, memmovefailed jmp sayerr_plain @@: pop ax ; restore from stack count of words in boot+FAT shl ax, 1 ; make bytes count from count of words and eax, 0ffffh add dword [si+8*3+2], eax ; copy first FAT to second copy ; TODO: BPB_NumFATs !!!!! add bx, word [BPB_BytsPerSec] ; !!! TODO: may be need multiply by BPB_RsvdSecCnt !!! mov byte [si+8*2+3], bh ; bx - begin of FAT mov ax, word [BPB_BytsPerSec] shr ax, 1 ; words per sector mov cx, word [BPB_FATSz16] mul cx mov cx, ax ; cx - count of words in FAT push es push ds pop es mov ah, 0x87 int 0x15 pop es test ah, ah jnz sayerr_floppy mov ax, cx shl ax, 1 and eax, 0ffffh ; ax - count of bytes in FAT add dword [si+8*3+2], eax ; reading RootDir ; TODO: BPB_NumFATs add bx, ax add bx, 100h and bx, 0ff00h ; bx - place in buffer to write RootDir push bx mov bx, word [BPB_BytsPerSec] shr bx, 5 ; divide bx by 32 mov ax, word [BPB_RootEntCnt] xor dx, dx div bx push ax ; ax - count of RootDir sectors mov ax, word [BPB_FATSz16] xor cx, cx mov cl, byte [BPB_NumFATs] mul cx add ax, word [BPB_RsvdSecCnt] ; ax - first sector of RootDir mov word [FirstDataSector], ax pop bx push bx add word [FirstDataSector], bx ; Begin of data region of floppy ; read RootDir call conv_abs_to_THS pop ax pop bx ; place in buffer to write push ax call boot_read_floppy ; read RootDir into buffer ; copy RootDir mov byte [si+8*2+3], bh ; from buffer pop ax ; ax = count of RootDir sectors mov cx, word [BPB_BytsPerSec] mul cx shr ax, 1 mov cx, ax ; count of words to copy push es push ds pop es mov ah, 0x87 int 0x15 pop es mov ax, cx shl ax, 1 and eax, 0ffffh ; ax - count of bytes in RootDir add dword [si+8*3+2], eax ; add count of bytes copied ; Reading data clusters from floppy mov byte [si+8*2+3], bh push bx mov di, 2 ; First data cluster .read_loop: mov bx, di shr bx, 1 ; bx+di = di*1.5 jnc .even test word [es:bx+di+0xB200], 0xFFF0 ; TODO: may not be 0xB200 !!! jmp @f .even: test word [es:bx+di+0xB200], 0xFFF ; TODO: may not be 0xB200 !!! @@: jz .skip ; read cluster di ;.read: ;conv cluster di to abs. sector ax ; ax = (N-2) * BPB_SecPerClus + FirstDataSector mov ax, di sub ax, 2 xor bx, bx mov bl, byte [BPB_SecPerClus] mul bx add ax, word [FirstDataSector] call conv_abs_to_THS pop bx push bx mov al, byte [BPB_SecPerClus] ; number of sectors in cluster call boot_read_floppy push es push ds pop es pusha ; mov ax, word [BPB_BytsPerSec] xor cx, cx mov cl, byte [BPB_SecPerClus] mul cx shr ax, 1 ; ax = (BPB_BytsPerSec * BPB_SecPerClus)/2 mov cx, ax ; number of words to copy (count words in cluster) ; mov ah, 0x87 int 0x15 ; copy data test ah, ah popa pop es jnz sayerr_floppy ; skip cluster di .skip: mov ax, word [BPB_BytsPerSec] xor cx, cx mov cl, byte [BPB_SecPerClus] mul cx and eax, 0ffffh ; ax - count of bytes in cluster add dword [si+8*3+2], eax mov ax, word [end_of_FAT] ; max cluster number pusha ; draw percentage ; total clusters: ax ; read clusters: di xchg ax, di mov cx, 100 mul cx div di aam xchg al, ah add ax, '00' mov si, pros cmp [si], ax jz @f mov [si], ax call printplain @@: popa inc di cmp di, word [end_of_FAT] ; max number of cluster jnz .read_loop pop bx ; clear stack ok_sys_on_floppy: mov si, backspace2 call printplain mov si, okt call printplain no_sys_on_floppy: xor ax, ax ; reset drive xor dx, dx int 0x13 mov dx, 0x3f2 ; floppy motor off mov al, 0 out dx, al ; SET GRAPHICS xor ax, ax mov es, ax mov ax, [es:0x9008] ; vga & 320x200 mov bx, ax cmp ax, 0x13 je setgr cmp ax, 0x12 je setgr mov ax, 0x4f02 ; Vesa setgr: int 0x10 test ah, ah mov si, fatalsel jnz v_mode_error ; set mode 0x12 graphics registers: cmp bx, 0x12 jne gmok2 mov al, 0x05 mov dx, 0x03ce push dx out dx, al ; select GDC mode register mov al, 0x02 inc dx out dx, al ; set write mode 2 mov al, 0x02 mov dx, 0x03c4 out dx, al ; select VGA sequencer map mask register mov al, 0x0f inc dx out dx, al ; set mask for all planes 0-3 mov al, 0x08 pop dx out dx, al ; select GDC bit mask register ; for writes to 0x03cf gmok2: push ds pop es