Subversion Repositories Kolibri OS

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2015. 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: 9942 $

;==========================================================================

;

;                           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

        test    al, al

        jnz     @b

        popa

        ret

getkey:                         ; Use BIOS INT 16h to read a key from the keyboard

; 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       ; If 'int 16h' is called with 'ah' equal to zero, the BIOS will not return control to the caller

        int     16h         ; until a key is available in the system type ahead buffer. On return, 'al' contains the ASCII

        cmp     al, 27      ; code for the key read from the buffer and 'ah' contains the keyboard scan code. (27=>ESC)

        jz      @f          ; If ESC is pressed, return (user doesn't want to change any value).

        cmp     al, bl      ; Compare 'al' (ASCII code of key pressed) with 'bl' (lowest accepted char from the range).

        jb      getkey      ; ASCII code is below lowest accepted value => continue waiting for another key.

        cmp     al, bh      ; Compare 'al' (ASCII code of key pressed) with 'bh' (highest accepted char from the range).

        ja      getkey      ; ASCII code is above highest accepted value => continue waiting for another key.

        push    ax          ; If the pressed key is in the accepted range, save it on the stack and echo to screen.

        call    putchar

        pop     ax

        and     ax, 0Fh     ; Convert ASCII code to number: '1'->1, '2'->2, etc. 0Fh=1111b.

        jnz     @f          ; ASCII code for '0' is 48 (110000b). (110000b AND 1111b) = 0

        mov     al, 10      ; So if key '0' was entered, return 10 in 'ax'

@@:

        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

}

macro _ask_question question,range,variable_to_set

{

        _setcursor 16,0

        mov     si, question    ; Print the question

        call    print

        mov     bx, range       ; range accepted for answer

        call    getkey

        cmp     al, 27          ; If ESC was pressed, do not change the value

        jz      .esc_pressed

        mov     [variable_to_set], al

}

clear_status_field:

        mov     si, space_msg

        mov     byte [si+80], 0

        _setcursor 16,0

        call    printplain

        _setcursor 16,0

        ret

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

sayerr_badsect:

        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

if defined extended_primary_loader

include 'parsers.inc'

end if

start_of_code:

if defined extended_primary_loader

; save data from primary loader

        mov     word [cs:bootcallback], si

        mov     word [cs:bootcallback+2], ds

        push    cs

        pop     ds

        mov     [bootdevice], ax

        mov     [bootfs], bx

; set up stack

        mov     ax, (TMP_STACK_TOP and 0xF0000) shr 4

        mov     ss, ax

        mov     sp, TMP_STACK_TOP and 0xFFFF

; try to load configuration file

        mov     ax, 1

        mov     di, config_file_struct

        call    [bootcallback]

        cld

        push    cs

        pop     es

; bx=0 - ok, bx=1 - part of file loaded, assume this is ok

        cmp     bx, 1

        ja      .config_bad

; configuration file was loaded, parse

; if length is too big, use first 0FFFFh bytes

        test    dx, dx

        jz      @f

        mov     ax, 0FFFFh

@@:

; ds:si will be pointer to current data, dx = limit

        xchg    ax, dx

        push    4000h

        pop     ds

        xor     si, si

.parse_loop:

; skip spaces

        cmp     si, dx

        jae     .parse_done

        lodsb

        cmp     al, ' '

        jbe     .parse_loop

        dec     si

; loop over all possible configuration values

        mov     bx, config_file_variables

.find_variant:

; get length

        mov     cx, [es:bx]

; zero length = end of list

        jecxz   .find_newline

; skip over length

        inc     bx

        inc     bx

        mov     di, bx

; skip over string

        add     bx, cx

; test whether we have at least cx symbols left

        mov     ax, cx

        add     ax, si

        jc      .next_variant1

        cmp     ax, dx

        jae     .next_variant1

; save current position

        push    si

; compare strings

        repz cmpsb

        jnz     .next_variant2

; strings are equal; look for "=" with possible spaces before and after

@@:

        cmp     si, dx

        jae     .next_variant2

        lodsb

        cmp     al, ' '

        jbe     @b

        cmp     al, '='

        jnz     .next_variant2

; ok, we found the true variant

; ignore saved position on the stack

        pop     ax

; call the parser

        call    word [es:bx]

; line parsed, find next

.find_newline:

        cmp     si, dx

        jae     .parse_done

        lodsb

        cmp     al, 13

        jz      .parse_loop

        cmp     al, 10

        jz      .parse_loop

        jmp     .find_newline

.next_variant2:

; continue to the next variant, restoring current position

        pop     si

.next_variant1:

; continue to the next variant

; skip over the parser

        inc     bx

        inc     bx

        jmp     .find_variant

.parse_done:

.config_bad:

; set up segment registers

        push    cs

        pop     ds

else

        cld

        push    0

        pop     es

; 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

        mov     word [es:BOOT_LO.kernel_restart], kernel_restart_bootblock

@@:

; if bootloader sets cx = 'HA' and dx = 'RD', then bx contains identifier of source disk

; (see comment to BOOT_LO.sys_disk and loader_doc.txt)

        mov     word [es:BOOT_LO.sys_disk], 'r1'  ; default value: /rd/1

        cmp     cx, 'HA'

        jnz     no_hd_load

        cmp     dx, 'RD'

        jnz     no_hd_load

        mov     [es:BOOT_LO.sys_disk], bx

no_hd_load:

; set up stack

        mov     ax, (TMP_STACK_TOP and 0xF0000) shr 4

        mov     ss, ax

        mov     sp, TMP_STACK_TOP and 0xFFFF

; set up segment registers

        push    cs

        pop     ds

        push    cs

        pop     es

end if

; 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

; set up esp

        movzx   esp, sp

        push    0

        pop     es

        xor     cx, cx

@@:

        in      al, 64h

        test    al, 2

        loopnz  @b

        mov     al, 0xf6        ; Сброс клавиатуры, разрешить сканирование

        out     0x60, al

        xor     cx, cx

@@:

        in      al, 64h

        test    al, 1

        loopz   @b

        in      al, 0x60

; set keyboard typematic rate & delay

        mov     al, 0xf3

        out     0x60, al

        xor     cx, cx

@@:

        in      al, 64h

        test    al, 1

        loopz   @b

        in      al, 0x60

        mov     al, 0

        out     0x60, al

        xor     cx, cx

@@:

        in      al, 64h

        test    al, 1

        loopz   @b

        in      al, 0x60

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

        sti

; --------------- APM ---------------------

        and     word [es:BOOT_LO.apm_version], 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:BOOT_LO.apm_version], ax         ; Save APM Version

        mov     [es:BOOT_LO.apm_flags], 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:BOOT_LO.apm_entry], ebx

        mov     [es:BOOT_LO.apm_code_32], ax

        mov     [es:BOOT_LO.apm_code_16], cx

        mov     [es:BOOT_LO.apm_data_16], dx

apm_end:

        _setcursor d80x25_top_num, 0

if ~ defined extended_primary_loader

;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

end if

noloaderblock:

; DISPLAY VESA INFORMATION

        call    print_vesa_info

        call    calc_vmodes_table

        call    check_first_parm   ;check and enable cursor_pos

cfgmanager:

; settings:

; a) preboot_graph = graphical mode

;    preboot_gprobe = probe this mode?

; b) preboot_biosdisk  = use BIOS disks through V86 emulation? // (earlier was: preboot_dma  = use DMA access?)

; c) preboot_debug = duplicates kernel debug output to the screen

; d) preboot_launcher = start the first app (right now it's LAUNCHER) after kernel is loaded?

; e) preboot_device = from where to boot?

; determine default settings

if ~ defined extended_primary_loader

        mov     [.bSettingsChanged], 0

end if

;.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

if defined extended_primary_loader

        inc     byte [di]

        cmp     byte [bootdevice], 'f' ; floppy?

        jz      .preboot_device_inited

        inc     byte [di]

else

        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

end if

.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_launcher-preboot_device], 1        ; Start LAUNCHER by default

        adc     byte [di+preboot_launcher-preboot_device], 0

        _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, debug_mode_msg

        cmp     [preboot_debug], 1

        call    .say_on_off

        mov     si, launcher_msg

        cmp     [preboot_launcher], 1

        call    .say_on_off

        mov     si, preboot_device_msg

        call    print

        mov     al, [preboot_device]

if defined extended_primary_loader

        and     eax, 3

else

        and     eax, 7

end if

        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'         ; select graphical mode

        jz      .change_a

        cmp     al, 'q'         ; Trick to make 'A' key on azerty keyboard work

        je      .change_a

        cmp     al, 'b'         ; use BIOS disks? // (selecting YES will make BIOS disks visible as /bd)

        jz      .change_b

        cmp     al, 'c'         ; load kernel in debug mode?

        jz      .change_c

        cmp     al, 'd'         ; start launcher after kernel is loaded?

        jz      .change_d

        cmp     al, 'e'         ; select boot origin

        jnz     .show_remarks

; e) preboot_device = from where to boot?

if defined extended_primary_loader

        _ask_question bdev,'13',preboot_device  ; range accepted for answer: 1-3

else

        _ask_question bdev,'14',preboot_device              ; range accepted for answer: 1-4

end if

        _setcursor 14,0

.d:

if ~ defined extended_primary_loader

        mov     [.bSettingsChanged], 1

end if

.esc_pressed:

        call    clear_vmodes_table             ;clear vmodes_table

        jmp     .printcfg

.change_a:

        call    clear_vmodes_table             ;clear vmodes_table

        mov     si, word [cursor_pos]

        mov     word [cursor_pos_old], si

.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     al, 27              ; If ESC was pressed, do not change the value

        jnz     @f                   ; Just exit the resolution selection box

        mov     si, word [cursor_pos_old]

        mov     word [cursor_pos], si

        jmp     .esc_pressed

@@:

        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:                      ; b) preboot_biosdisk  = use BIOS disks through V86 emulation?

;        _setcursor 16,0

;        mov     si, ask_dma    // (earlier was: preboot_dma  = use DMA access?)

;        call    print

;        mov     bx, '13'       ; range accepted for answer: 1-3

;        call    getkey

;        mov     [preboot_dma], al

        _ask_question ask_bd,'12',preboot_biosdisk              ; range accepted for answer: 1-2

        _setcursor 11,0

        jmp     .d

.change_c:                      ; c) preboot_debug = duplicates kernel debug output to the screen

        _ask_question ask_debug,'12',preboot_debug              ; range accepted for answer: 1-2

        _setcursor 12,0

        jmp     .d

.change_d:                      ; d) preboot_launcher = start the first app (right now it's LAUNCHER) after kernel is loaded?

        _ask_question ask_launcher,'12',preboot_launcher        ; range accepted for answer: 1-2

        _setcursor 13,0

        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 ?

if ~ defined extended_primary_loader

.bSettingsChanged db ?

end if

.timer dd ?

end virtual

if ~ defined extended_primary_loader

.loader_block dd -1

end if

.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]

if defined extended_primary_loader

        sub     ax, [preboot_timeout]

else

        ; bios 0x1A timer runs at ~18 ticks per second

        sub     ax, 18*PREBOOT_TIMEOUT

end if

        jae     .timergo

        neg     ax

        add     ax, 18-1

        mov     bx, 18

        xor     dx, dx

        div     bx

if lang eq ru

; подождите 5 секунд, 4/3/2 секунды, 1 секунду

        cmp     al, 5

        mov     cl, ' '

        jae     @f

        cmp     al, 1

        mov     cl, 0xE3 ; 'у' in cp866

        jz      @f

        mov     cl, 0xEB ; 'ы' in cp866

@@:

        mov     [time_str+9], cl

else if lang eq et

        cmp     al, 1

        ja      @f

        mov     byte [time_str+9], ' '

        mov     byte [time_str+10], ' '

@@:

else if lang eq sp

; esperar 5/4/3/2 segundos, 1 segundo

        cmp     al, 1

        mov     cl, 's'

        ja      @f

        mov     cl, ' '

@@:

        mov     [time_str+10], cl

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 16,0

if ~ defined extended_primary_loader

        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

        if lang eq sp

        cmp     al, 's'

        else

        cmp     al, 'y'

        end if

        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

        push    es

        les     bx, [.loader_block]

        cmp     byte [es:bx+7], 0      ; get write error flag

        pop     es

        jz      .load

        call    clear_status_field

        mov     si, write_err_msg

        call    print

.wait_any_key:

        xor     ax, ax

        int     16h

        test    ax, ax

        jz      .wait_any_key

.load:

        call    clear_status_field

end if

; ASK GRAPHICS MODE

        call    set_vmode

; GRAPHICS ACCELERATION

; force yes

        mov     [es:BOOT_LO.mtrr], byte 1

; DMA ACCESS TO HD

        mov     al, [preboot_dma]

        mov     [es:BOOT_LO.dma], al

; Set kernel DEBUG mode - if nonzero, duplicates debug output to the screen.

        mov     al, [preboot_debug]

        mov     [es:BOOT_LO.debug_print], al       ;// 0x901E

; Start the first app (right now it's LAUNCHER) after kernel is loaded?

        mov     al, [preboot_launcher]

        mov     [es:BOOT_LO.launcher_start], al    ;// 0x901D

; BOOT DEVICE

        mov     al, [preboot_device]

if defined extended_primary_loader

        cmp     al, RD_LOAD_FROM_MEMORY

        jnz     @f

        mov     al, RD_LOAD_FROM_NONE

@@:

end if

        mov     [es:BOOT_LO.rd_load_from], al

; /sys path

        mov     eax, dword[preboot_syspath+0]

        mov     dword[es:BOOT_LO.syspath+0], eax

        mov     eax, dword[preboot_syspath+4]

        mov     dword[es:BOOT_LO.syspath+4], eax

        mov     eax, dword[preboot_syspath+8]

        mov     dword[es:BOOT_LO.syspath+8], eax

        mov     eax, dword[preboot_syspath+12]

        mov     dword[es:BOOT_LO.syspath+12], eax

; GET MEMORY MAP

include '../detect/biosmem.inc'

; READ DISKETTE TO MEMORY

        cmp     byte [es:BOOT_LO.rd_load_from], RD_LOAD_FROM_FLOPPY

        jne     no_sys_on_floppy

        mov     si, diskload

        call    print

        xor     ax, ax          ; reset drive

        xor     dx, dx          ; 1st floppy disk (0)

        int     0x13

; do we boot from CD-ROM?

        mov     ah, 41h         ; check extended mode

        mov     bx, 55AAh       ; test 2 bytes to check that this function is supported

        xor     dx, dx          ; 1st floppy disk (0)

        int     0x13

        jc      .nocd           ; extended mode not supported

        cmp     bx, 0AA55h

        jnz     .nocd           ; extended mode not supported

        mov     ah, 48h         ; extended read drive parameters

        push    ds

        push    es

        pop     ds

        mov     si, 0xa000

        mov     word [si], 30   ; size of result buffer

        int     0x13

        pop     ds

        jc      .nocd           ; error getting parameters

        push    ds

        lds     si, [es:si+26]  ; pointer to Enhanced Disk Drive (EDD) configuration parameters

        test    byte [ds:si+10], 40h ; check ATAPI device

        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]