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Index > OS Construction > Boot problem (vesa mode)
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grunge



Joined: 11 Sep 2005
Posts: 21
Location: Brasil
grunge 21 Oct 2006, 23:25
Hello All

I have one new problem Embarassed ... now I use the vesa mode in my OS... but have one problem in the boot... when I use the vesa mode directely in bootloader, the graph is correct, but when I use the all code of vesa mode as kernel, the graph is not correct, think that problem must be in the segments when kernel is loaded, I trying, but dont have one positive result, this problem can be solved? I use the "bootmosf.asm"(MenuetOS) for my study... already tried others bootloaders... but dont have one positive result... I need help...

Thanks for All...


My code (is my vesa test...)

Code:
;ORG 100h


;   Mov   AX,1000h ; HERE IS POSSIBLE PROBLEM
;   Mov   DS,AX
;   Mov   ES,AX

Start:
   mov ax,4f02h
   mov bx,101h
   int 10h


   mov dx,0xa000
   mov es,dx
   call window

StartAgain:
   xor dx,dx
   mov [Cor],0


      
MainLoop:

   Mov  [y],100
   Mov  [x],100
   Call Pixel


B1:
   push dx
   call window
   xor bx,bx        
   pop dx
   inc dx
   push dx
   call window
   xor bx,bx       
   pop dx

B2:
   push dx
   call window
   xor bx,bx        
   pop dx
   inc dx
   push dx
   call window
   xor bx,bx       
   pop dx

B3:
   push dx
   call window
   xor bx,bx        
   pop dx
   inc dx
   push dx
   call window
   xor bx,bx       
   pop dx

B4:
   push dx
   call window
   xor bx,bx        
   pop dx
   inc dx
   push dx
   call window
   xor bx,bx       
   pop dx



   mov byte [Row],7
   mov edi,262500 ; Position
   mov bx,di ; ver
   mov si,LetterR
   mov dh,0ah
   call DrawImage

   Mov [y],410
   Mov [x],20
   Call Pixel

   Mov [y],410
   Mov [x],620
   Call Pixel



B0:
   push dx
   mov dx,0xa000
   mov es,dx
   call window

   xor dx,dx
   pop dx


   mov byte [Row],7
   mov edi,51250
   mov bx,di
   mov si,LetterR
   mov dh,0ah
   call DrawImage

   Mov   [y],100
   Mov   [x],200
   Call  Pixel

   mov ah,01h
   int 16h

   mov ah,00h
   int 16h
   mov ax,0003h
   int 10h

   ret

Pixel:

   Push  DX
   Push  ES
   Mov   AX,0A000h 
   Mov   ES,AX
   Mov   AX,640
   Mul   [y] 
   Add   AX,[x] 
   Mov   BX,AX
   Mov   DL,9
   Mov   [ES:BX],DL
   Pop   ES
   Pop   DX
   Retn

window:
        mov ax,4f05h
        mov bx,0
        int 10h
        xor bx,bx
        ret

DrawImage:
        mov di,bx ; ver
        mov dl,[Row]
        cld
GetData:    
        lodsw
        mov bx,ax 
        mov cl,16
CheckBit:
        test bx,0x8000 ; bx
        jz ZeroBit
        mov al,dh    
        stosb
        jmp Skip                    
ZeroBit:
        inc di
Skip:
        shl bx,1  
        loop CheckBit          
        add di,624
        dec dl
        jnz  GetData
        ret

Cor    DB 0
x      DW 0
y      DW 0

Row      DB         0
LetterR  DW         7800h,4400h,4400h,7800h,4400h,4400h,4400h


BootMosf:

Code:
;=======================================================
;= boot program for Menuet OS version 1.00
;= January 2002
;=
;= Copyright (C) Alex Nogueira Teixeira
;= E-Mail : alexwal@siteplanet.com.br
;=
;= Distributed under GPL, see file COPYING for details
;=
;= equates for program
;=======================================================
   
lf  equ 0ah
cr  equ 0dh
   
pos_read_tmp       equ 0700h ;position for temporary read
boot_program       equ 07c00h ;position for boot code
seg_read_kernel    equ 01000h ;seguiment to kernel read
   
                   jmp start_program
                   nop
   
oemname            db 'MENUETOS'
bytespersector     dw 512
sectorspercluster  db 1
ressectors         dw 1
numcopiesfat       db 2
maxallocrootdir    dw 224
maxsectors         dw 2880 ;for 1.44 mbytes disk
mediadescriptor    db 0f0h ;fd = 2 sides 18 sectors
sectorsperfat      dw 9
sectorspertrack    dw 18
heads              dw 2
hiddensectors      dd 0
hugesectors        dd 0 ;if sectors > 65536
drivenumber        db 0
                   db 0
bootsignature      db 029h ;extended boot signature
volumeid           dd 0
volumelabel        db 'MENUET DISK'
filesystemtype     db 'FAT12   '


start_program:

  xor ax,ax
  mov ss,ax
  mov sp,boot_program
  push ss
  pop ds

  mov  si,loading+boot_program
loop_loading:
  lodsb
  or al,al
  jz procura_arquivo_novamente
  mov ah,0eh
  mov bx,07h
  int 010h
  jmp loop_loading


procura_arquivo_novamente:

  push ss
  pop es

  mov  bp,16

newtry:

  dec bp
  jz  mensagem_erro_arquivo

  mov ax,020eh ;read, 14 sectors for directory
  mov bx,pos_read_tmp ;es:bx read position
  mov cx,02h ;track 0, sector 2
  mov dx,0100h ;head 1, drive 0 (aSmile
  call read_sector
;  int 013h ;read sectors
;  jc  newtry ; mensagem_erro_arquivo

  mov si,bx

loop_compara_entrada_diretorio:

  push si
  mov cx,11 ;file name
  mov di,arq_boot+boot_program
  rep cmpsb
  pop si
  je le_arquivo_kernel
  add si,32
  cmp si,pos_read_tmp+(512*14) ;end of directory
  jb loop_compara_entrada_diretorio

mensagem_erro_arquivo:

  mov si,mens_erro+boot_program

loop_envio_mensagem:

  lodsb
  or al,al
  jz espera_digitar_tecla
  mov ah,0eh
  mov bx,07h
  int 010h
  jmp loop_envio_mensagem

espera_digitar_tecla:

  jmp $


; load kernel

le_arquivo_kernel:

  mov bp,[si+01ah]
  mov ax,0209h ;read, 9 sectors
  mov bx,pos_read_tmp ;es:bx read position
  mov cx,02h ;track 0, sector 2
  xor dx,dx ;head 0, drive 0 (aSmile
  call read_sector
;  int 013h  ;read sectors
  jc mensagem_erro_arquivo
  mov ax,seg_read_kernel
  mov es,ax
  xor bx,bx

  ; read kernel to es:bx 

loop_obtem_dados_kernel:
  call le_setor_dados
  jc mensagem_erro_arquivo
;  add bx,0200h ;add one sector

  push bx
  mov bx,es
  add bx,0x20
  mov es,bx
  pop bx

  mov di,bp
  shr di,01h
  pushf
  add di,bp
  add di,pos_read_tmp
  mov ax,[di]
  popf
  jc desloca_4_direita
  and ax,0fffh
  jmp verifica_fim_setores
desloca_4_direita:
  mov cl,4
  shr ax,cl
verifica_fim_setores:
  cmp ax,0ff8h
  jae executa_kernel
  mov bp,ax
  jmp loop_obtem_dados_kernel

executa_kernel:
  push word seg_read_kernel
  push word 00h
  retf


le_setor_dados: ;es:bx -> position in read buffer

  ;bp -> logical sector to read
  ;carry <- 0 read OK
  ;carry <- 1 read error
  push bx
  mov ax,0e2eh ;decimal point
  xor bh,bh
  int 010h
  pop bx
  mov ax,bp ;data sector to read
  add ax,31 ;get logical sector
  mov cx,36 ;sector/track
  xor dx,dx
  div cx
  mov ch,al ;track transfer
  xor dh,dh ;head 0
  cmp dl,18
  jb cabeca_correta
  sub dl,18
  inc dh ;head 1
cabeca_correta:
  inc dl
  mov cl,dl
  xor dl,dl ;drive 0 (aSmile
  mov ax,0201h ;read 1 sector
  call read_sector
;  int 013h
  retn

read_sector:

  push bp
  mov  bp,20
 newread:
  dec  bp
  jz   mensagem_erro_arquivo
  push ax bx cx dx
  int  0x13
  pop  dx cx bx ax
  jc   newread
  pop  bp
  retn

loading   db 13,10,'Starting MenuetOS ',00h
mens_erro:
          db 13,10
arq_boot:
          db 'KERNEL  BIN ?',cr,lf,00h
errors    db 16


times 0x1fe-$ db 00h

  db 55h,0aah ;boot signature
Post 21 Oct 2006, 23:25
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u 22 Oct 2006, 00:39
I have tested your code, i get a R .. nere to the top of page and the same at the bottom maybe a bit more spaced out.
But i do not know what it should look like, here is the way i booted it
With this program http://www.dex4u.com/Redragon/kernel.zip
This will put a com file loader on a floppy, all you need do is call your test program "kernel16.com" and put it on the floppy to test your OS.
Post 22 Oct 2006, 00:39
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grunge



Joined: 11 Sep 2005
Posts: 21
Location: Brasil
grunge 23 Oct 2006, 00:08
Ok Dex4u...

I tried your program and replace my bootloader for one that run EXE & COM (ORGs 100h)... now my graph is correct! I study your demo for vesa in 32 bits... tried for pixel and others... Smile thanks... if you have more examples of vesa in 32 bists... I thank...

Thanks for all...
Post 23 Oct 2006, 00:08
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u 23 Oct 2006, 12:16
Your welcome, here's a demo i made of booting and displaying a 640x480bmp image from pmode using vesa2. http://www.dex4u.com/pascal/BmpView.zip
And also try CdPod here: http://board.flatassembler.net/topic.php?t=2164&start=60
Note: i was called ASHLEY4 when i made cdpod, also, cdpod will only work with a 32bpp vesa, as some use 24bpp.
Post 23 Oct 2006, 12:16
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Mac2004



Joined: 15 Dec 2003
Posts: 314
Mac2004 14 Jan 2007, 14:16
Hi Grunge!

If you need a working simple binary boot sector you can use mine which is posted in this forum. Here's the link:

http://board.flatassembler.net/topic.php?t=6529

I did keep the boot loader as simple as possible because it's easier to add things when the base boot is properly working.

regards,
Mac2004
Post 14 Jan 2007, 14:16
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grunge



Joined: 11 Sep 2005
Posts: 21
Location: Brasil
grunge 20 Jan 2007, 20:41
Hi Mac2004

Thanks for your idea, but my OS run with FAT and I tried one basic file system...

thanks,

grunge
Post 20 Jan 2007, 20:41
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