;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; 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]
mov byte [BPB_SecPerClus], al
mov al, byte [es:bx+16]
mov byte [BPB_NumFATs], al
;<Lrz> 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 <Lrz> 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
sayerr_memmove:
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
if defined extended_primary_loader
cmp [es:BOOT_LO.rd_load_from], RD_LOAD_FROM_HD
jne no_sys_from_primary
; load kolibri.img using callback from primary loader
and word [movedesc + 24 + 2], 0
mov byte [movedesc + 24 + 4], 10h
; read in blocks of 64K until file is fully loaded
mov ax, 1
.repeat:
mov di, image_file_struct
call [bootcallback]
push cs
pop ds
push cs
pop es
cmp bx, 1
ja sayerr_badsect
push bx
mov si, movedesc
and word [si + 16 + 2], 0
mov byte [si + 16 + 4], 4
mov ah, 87h
mov cx, 8000h
int 15h
pop bx
test ah, ah
jnz sayerr_memmove
inc byte [si + 24 + 4]
test bx, bx
jz no_sys_from_primary
mov ax, 2
jmp .repeat
no_sys_from_primary:
end if
; SET GRAPHICS
xor ax, ax
mov es, ax
mov ax, [es:BOOT_LO.vesa_mode] ; 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