;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2010. 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: 1700 $
;==========================================================================
;
; 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:
;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
; 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
; stoswvmode
; loop @b
mov byte [space_msg+80], 0 ; now space_msg is null terminated
_setcursor d80x25_top_num,0
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}
; --------------- 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]
sti
; wait for keypressed
xor ax,ax
int 16h
push ax
; restore timer interrupt
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
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_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
; wait 5/4/3/2 seconds, 1 second
cmp al, 1
mov cl, 's'
ja @f
mov cl, ' '
@@: mov [time_str+9], cl
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
; GET MEMORY MAP
include 'detect/biosmem.inc'
; 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
;<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
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 bx, [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