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.img size problem, using Gregor Brunmar solution
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juanma268
Joined: Thu Jan 13, 2011 10:56 am
Posts: 13
Location: Costa Rica
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 .img size problem, using Gregor Brunmar solution Hi, the file a.img has a size bound?
when i compile my source code it weights 30 kb and works fine, but when i add more
code to the a.img, it weights 34 kb and the OS crashes.
In the attachment files when i uncomment the function:
"void llenarPantallaHileraAux(char* hilera,byte elColorChar,byte elColorFondo,int residuo)" in the video.cpp
file, lines 319-354 it halts when i run it.
I am using Oracle VM VirtualBox 3.2.12, windows xp 32-bits sp2, the built-utils of Mingw from CodeBlocks 10.05.
I have tried Qemu but nothing.
a_babel.img and a_cuadrado.img are examples of image files that works fine for me.
Sorry for my english, Thanks!
_________________
"De veras hijo: Todas las estrellas han partido, pero nunca se pone más oscuro que cuando va a amanecer" - Isaac Felipe Azofeifa
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| Thu Jan 13, 2011 11:04 am |
  
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juanma268
Joined: Thu Jan 13, 2011 10:56 am
Posts: 13
Location: Costa Rica
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Re: .img size problem, using Gregor Brunmar solution Sorry but i can not load files!, neither .zip, .tar, .7z, .h, .asm?
_________________
"De veras hijo: Todas las estrellas han partido, pero nunca se pone más oscuro que cuando va a amanecer" - Isaac Felipe Azofeifa
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| Thu Jan 13, 2011 11:12 am |
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juanma268
Joined: Thu Jan 13, 2011 10:56 am
Posts: 13
Location: Costa Rica
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Re: .img size problem, using Gregor Brunmar solution Ok i used this bootloader.asm code from Brunmar: Code: ;CREDITOS: Gregor Brunmar, www.osdever.net/tutorials/brunmar/tutorial_03.php
section .text
[BITS 16] ; We need 16-bit intructions for Real mode
[ORG 0x7C00] ; The BIOS loads the boot sector into memory fixed location 0x7C00
reset_drive:
mov ah, 0 ; RESET-command
int 13h ; Call interrupt 13h
or ah, ah ; Check for error code
jnz reset_drive ; Try again if ah != 0
mov ax, 0
mov es, ax
mov bx, 0x1000 ; Destination address = 0000:1000
mov ah, 02h ; READ SECTOR-command
mov al, 19h ; Number of sectors to read = 1
mov ch, 0 ; Cylinder = 0
mov cl, 02h ; Sector = 2
mov dh, 0 ; Head = 0
int 13h ; Call interrupt 13h
or ah, ah ; Check for error code
jnz reset_drive ; Try again if ah != 0
;CAMBIAMOS A MODO GRAFICO, no hay retorno a modo texto con la implementacion actual...
;mov al,13h ;320*200, 256 colores
mov ax,0012h ;640*480, 16 colores
int 10h
;
cli ; Disable interrupts, we want to be alone
xor ax, ax
mov ds, ax ; Set DS-register to 0 - used by lgdt
lgdt [gdt_desc] ; Load the GDT descriptor
mov eax, cr0 ; Copy the contents of CR0 into EAX
or eax, 1 ; Set bit 0
mov cr0, eax ; Copy the contents of EAX into CR0
jmp 08h:clear_pipe ; Jump to code segment, offset clear_pipe
[BITS 32] ; We now need 32-bit instructions
clear_pipe:
mov ax, 10h ; Save data segment identifyer
mov ds, ax ; Move a valid data segment into the data segment register
mov ss, ax ; Move a valid data segment into the stack segment register
mov esp, 090000h ; Move the stack pointer to 090000h
jmp 08h:01000h ; Jump to section 08h (code), offset 01000h
gdt: ; Address for the GDT
gdt_null: ; Null Segment
dd 0
dd 0
gdt_code: ; Code segment, read/execute, nonconforming
dw 0FFFFh
dw 0
db 0
db 10011010b
db 11001111b
db 0
gdt_data: ; Data segment, read/write, expand down
dw 0FFFFh
dw 0
db 0
db 10010010b
db 11001111b
db 0
gdt_end: ; Used to calculate the size of the GDT
gdt_desc: ; The GDT descriptor
dw gdt_end - gdt - 1 ; Limit (size)
dd gdt ; Address of the GDT
times 510-($-$$) db 0 ; Fill up the file with zeros //RELLENA LOS 512 CON CEROS
dw 0AA55h ; Boot sector identifyer
and this .bat file: Code: @echo off
::codigo ensamblador
nasm -f bin bootsect.asm -o bootsect.bin
nasm funcionesAsm.asm -f win32 -o funcionesAsm.o
::codigo c/c++
gcc -w makeboot.c -o makeboot.exe
g++ -c main.cpp -o main.o
g++ -c ports.cpp -o ports.o -masm=intel
g++ -c video.cpp -o video.o
g++ -c sonido.cpp -o sonido.o
::linkeamos
ld -e __Z9principalv -share -Ttext 0x01000 -o kernel.o main.o video.o ports.o sonido.o funcionesAsm.o
::otros
objcopy -R .note -R .comment -S -O binary kernel.o kernel.bin
makeboot a.img bootsect.bin kernel.bin
pause
I know that because my kernel.bin is 33kb long it could be overlaping the bootloader at 0x7c00, to solve it i tried change the place in ram where the kernel is loaded from 0x1000 to 0xFFFFF (where te bios ram space end) in both: the bootloader.asm and the .bat file. But nothing.
_________________
"De veras hijo: Todas las estrellas han partido, pero nunca se pone más oscuro que cuando va a amanecer" - Isaac Felipe Azofeifa
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| Fri Jan 14, 2011 10:48 am |
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ctimko
Joined: Wed Oct 14, 2009 9:39 am
Posts: 198
Location: United States
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Re: .img size problem, using Gregor Brunmar solution What is the size of the floppy image file? It should be 1.44MB.
_________________
Charles Timko
push %esp ;Musings of a computer addict
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| Fri Jan 14, 2011 11:51 am |
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juanma268
Joined: Thu Jan 13, 2011 10:56 am
Posts: 13
Location: Costa Rica
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Re: .img size problem, using Gregor Brunmar solution Well, the current size of the .img file is 34 kb, I have compiled smallest ones and they have work before with Virtual Box. them.
_________________
"De veras hijo: Todas las estrellas han partido, pero nunca se pone más oscuro que cuando va a amanecer" - Isaac Felipe Azofeifa
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| Fri Jan 14, 2011 12:43 pm |
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juanma268
Joined: Thu Jan 13, 2011 10:56 am
Posts: 13
Location: Costa Rica
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Re: .img size problem, using Gregor Brunmar solution Well, I realize that i can load the kernel after the boot loader, this is my plan: +-------------------+ | 0x7c00: bootstrap | +-------------------+ | 0xa000: kernel | +-------------------+ | 0x90000: stack | +-------------------+ so i modified the previous code into this: Bootsect.asm Code: ;CREDITOS: Gregor Brunmar, www.osdever.net/tutorials/brunmar/tutorial_03.php
section .text
[BITS 16] ; We need 16-bit intructions for Real mode
[ORG 0x7C00] ; The BIOS loads the boot sector into memory fixed location 0x7C00
main:
call imprimir
call reset_drive
call copiarFloppyAMemoria
;CAMBIAMOS A MODO GRAFICO, no hay retorno a modo texto con la implementacion actual...
mov ax,0012h ;640*480, 16 colores
int 10h
cli ; Disable interrupts, we want to be alone
xor ax, ax
mov ds, ax ; Set DS-register to 0 - used by lgdt
lgdt [gdt_desc] ; Load the GDT descriptor
mov eax, cr0 ; Copy the contents of CR0 into EAX
or eax, 1 ; Set bit 0
mov cr0, eax ; Copy the contents of EAX into CR0
jmp 08h:clear_pipe ; Jump to code segment, offset clear_pipe
[BITS 32] ; We now need 32-bit instructions
clear_pipe:
mov ax, 10h ; Save data segment identifyer
mov ds, ax ; Move a valid data segment into the data segment register
mov ss, ax ; Move a valid data segment into the stack segment register
mov esp, 090000h ; Move the stack pointer to 090000h
jmp 08h:0a000h ; Jump to section 08h (code), offset 01000h, sin retorno
;imprimir cadena en ds:dx
imprimir:
pusha
mov ah,0Ah
mov al,'a'
mov bh,0
mov bl,07h
mov cx,1
int 10h
popa
ret
reset_drive:
pusha
mov ah, 0 ; RESET-command
int 13h ; Call interrupt 13h
or ah, ah ; Check for error code
jnz reset_drive ; Try again if ah != 0
popa
ret
copiarFloppyAMemoria:
pusha
;inicializamos segmento(es):desplazamiento(bx)
mov ax, 0
mov es, ax
mov bx,0a000h ; Destination address = xxxx:xxxx, 7C00h + (18d*512d) = A000
;inicializamos cilindro(ch) y cabeza (dh)
mov ch,byte 1 ;el cilindro 0 (de 18 sectores) pertenece al bootstrap
mov dh,0 ;basta con una cara del plato ((80-1) pistas * 18 sectores = 711Kbytes)
;especificamos funcion ah=2, int13h
mov ah, 2 ; READ SECTOR-command
mov al, 1 ; Number of sectors to read
mov dl, 0 ; usar el floppy
elFor1:
mov cl,0 ;sector actual
elFor2:
int 13h
or ah,ah ; Check for error code
jz comprobarDesplazamiento ; ah=0 si no hubo errores
;sino reseteamos floppy
call reset_drive
comprobarDesplazamiento:
;incrementamos desplazamiento en 512 bytes y aumentamos # de sector
add bx,512d
inc cl
;comprobamos que bx<65536 sino hacemos bx=0 y es++
cmp bx,word 65535d
jle finElFor2
;sino
xor bx,bx
pusha
mov ax,es
inc ax
mov es,ax
popa
finElFor2:
cmp cl,18d
jl elFor2
finElFor1:
cmp ch,80d
jl elFor2
;salimos
popa
ret
gdt: ; Address for the GDT
gdt_null: ; Null Segment
dd 0
dd 0
gdt_code: ; Code segment, read/execute, nonconforming
dw 0FFFFh
dw 0
db 0
db 10011010b
db 11001111b
db 0
gdt_data: ; Data segment, read/write, expand down
dw 0FFFFh
dw 0
db 0
db 10010010b
db 11001111b
db 0
gdt_end: ; Used to calculate the size of the GDT
gdt_desc: ; The GDT descriptor
dw gdt_end - gdt - 1 ; Limit (size)
dd gdt ; Address of the GDT
times 510-($-$$) db 0 ; Fill up the file with zeros //RELLENA LOS 512 CON CEROS
dw 0AA55h ; Boot sector identifyer .bat Code: @echo off
nasm -f bin bootsect.asm -o bootsect.bin
nasm funcionesAsm.asm -f win32 -o funcionesAsm.o
::codigo c/c++
gcc -w makeboot.c -o makeboot.exe
g++ -c main.cpp -o main.o
g++ -c ports.cpp -o ports.o -masm=intel
g++ -c video.cpp -o video.o
g++ -c sonido.cpp -o sonido.o
ld -e __Z9principalv -share -Ttext 0xA000 -o kernel.o main.o video.o ports.o sonido.o funcionesAsm.o
objcopy -R .note -R .comment -S -O binary kernel.o kernel.bin
makeboot a.img bootsect.bin kernel.bin
But without success, I can't even see the 'a' in the screen, any ideas would be appreciated.
_________________
"De veras hijo: Todas las estrellas han partido, pero nunca se pone más oscuro que cuando va a amanecer" - Isaac Felipe Azofeifa
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| Mon Jan 17, 2011 12:04 am |
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juanma268
Joined: Thu Jan 13, 2011 10:56 am
Posts: 13
Location: Costa Rica
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Re: .img size problem, using Gregor Brunmar solution Sorry, pulse of idiocy... i changed into video mode after printing in screen the 'A'.
_________________
"De veras hijo: Todas las estrellas han partido, pero nunca se pone más oscuro que cuando va a amanecer" - Isaac Felipe Azofeifa
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| Mon Jan 17, 2011 10:48 am |
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juanma268
Joined: Thu Jan 13, 2011 10:56 am
Posts: 13
Location: Costa Rica
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Re: .img size problem, using Gregor Brunmar solution Of course, "ret" does not function here, i have to implement it using jmp's and label's.
_________________
"De veras hijo: Todas las estrellas han partido, pero nunca se pone más oscuro que cuando va a amanecer" - Isaac Felipe Azofeifa
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| Mon Jan 17, 2011 11:48 am |
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