OSDev.org

Posted: **Tue Jan 25, 2011 1:48 am**

Hi! I have so more problems.

I created a bootloader that works when I add a boot record with no emulation in application isomaster (sudo apt-get install isomaster), but I loaded the kernel. I know that I need to emulate a floppy disk with a FAT12 file system. I have used everything and i see only blank screen ...

I use ubuntu, and nasm.

This is my bootloader:

Code: Select all

	;	Autor: dan-tom, 2011r.

[BITS 16]
[ORG 000h]

JMP POCZATEK

NAZWA_SYSTEMU		DB	'VAECE'
WIELKOSC_SEKTORA	DW	200H
WIELKOSC_CLUSTRA	DB	1H
ILE_ZAREZERWOWANYCH_SEKTOROW	DW	1H
ILE_TABLIC_ALOKACJI	DB	2H
ILE_ELEMENTOW_KATALOGU_GLOWNEGO	DW	0E0H
CALKOWITA_LICZBA_SEKTOROW	DW	0B40H
MEDIA_DESCRIPTOR_BYTE	DB	0F0H
ILE_SEKTOROW_NA_FAT	DW	9H
ILE_SEKTOROW_NA_SCIEZKE	DW	12H
ILE_GLOWIC	DW	2H
ILE_UKRYTYCH_SEKTOROW	DD	0H
TOTAL_SECTORS_LARGE	DD	0H
NUMER_DYSKIETKI	DB	0H
FLAGS2	DB	0H
SIGNATURE	DB	029H
VOLUME_ID	DD	0FFFFFFFFH
NAZWA_VOLUMENU	DB	'VAECEDT'
NAZWA_SYSTEMU_PLIKOW	DB	'FAT12	'

POCZATEK:
CLI
MOV AX,	07C0H
MOV DS,	AX
MOV	AX,	0H
MOV	SS,	AX
MOV	SP,	0FFFFH
STI
MOV DX,	BOOT_ZALADOWANY
CALL	WYPISZ_TEKST
MOV	AX,	DS
ADD	AX,	200H
MOV	ES,	AX
XOR	BX,	BX
MOV	DX,	[SEKTOR_ROOT_DIRECTORY]
MOV	CL,	[WIELKOSC_ROOT_DIRECTORY]
MOV	CH, 0
CALL ODCZYT_Z_DYSKU
XOR	DI,	DI
MOV	DX,	JADRO
CALL	SZUKAJ_JADRA
PUSH	AX
XOR	BX,	BX
MOV	DX,	[SEKTOR_FAT]
MOV	CL,	[WIELKOSC_FAT]
MOV CH, 0
CALL ODCZYT_Z_DYSKU
MOV	SI,	2000H
MOV	AX,	8000H
MOV	ES,	AX
XOR	BX,	BX
POP	AX

CALL	WCZYTAJ_PLIK_JADRA
MOV	AX,	8000H
PUSH	AX
MOV	AX,	0H
PUSH	AX
RETF
CALL	PROCEDURA_BEZ_KONCA

WYPISZ_TEKST:
PUSH	BX
XOR	BH,	BH
MOV	BL,	07H
MOV	SI,	DX
MOV	AH,	0EH
PETLA1_1:
MOV	AL,	[SI]
CMP	AL,	0
JE	END_PETLA1_1
INT	10H
INC	SI
JMP	PETLA1_1
END_PETLA1_1:
POP	BX
RET

CHS:
PUSH	BX
MOV	AX,	DX
MOV	BX,	DX
XOR	DX,	DX
MOV	CX,	[ILE_SEKTOROW_NA_SCIEZKE]
DIV	CX
INC	DX
PUSH	DX
XOR	DX,	DX
MOV	CX, [ILE_GLOWIC]
DIV	CX
POP	CX
MOV	CH,	AL
MOV	DH,	DL
XOR	DL,	DL
POP	BX
RET

ODCZYT_Z_DYSKU:
PETLA_ODCZYTU:
PUSH	BX
PUSH	CX
PUSH	DX
CALL	CHS
MOV	AL,	1
MOV	DL,	0
MOV	AH,	02H
INT	13H
JNC	KONIEC_P_0
MOV DX,	BLAD
CALL WYPISZ_TEKST
MOV	DX,	BLAD_0
CALL	WYPISZ_TEKST
CALL	PROCEDURA_BEZ_KONCA
KONIEC_P_0:
POP	DX
POP	CX
POP	BX
INC	DX
ADD	BX,	200H
LOOP	PETLA_ODCZYTU
RET

SZUKAJ_JADRA:
MOV	CX,	[ILE_ELEMENTOW_KATALOGU_GLOWNEGO]
PETLA_S_J:
CALL	POROWNAJ_NAPISY
JC	NAPISY_ROWNE
ADD	DI,	20H
LOOP	PETLA_S_J
MOV	DX,	BLAD
CALL	WYPISZ_TEKST
MOV	DX,	BLAD_1
CALL	WYPISZ_TEKST
CALL	PROCEDURA_BEZ_KONCA
NAPISY_ROWNE:
MOV	AX,	WORD	[ES:DI+1AH]
PUSH	AX
MOV	DX,	ZNALEZIONE_JADRO
CALL	WYPISZ_TEKST
POP	AX
RET

POROWNAJ_NAPISY:
PUSH	CX
PUSH	SI
PUSH	DI
MOV	SI,	DI
MOV	CX,	11
PETLA:
MOV	AL,	[ES:DI]
MOV	AH,	[DS:SI]
CMP	AL,	AH
JNE	KONIEC_NAPISY_ROZNE
INC	DI
INC	SI
LOOP	PETLA
STC
JMP	FIN
KONIEC_NAPISY_ROZNE:
CLC
FIN:
POP	DI
POP	SI
POP	CX
RET

PROCEDURA_BEZ_KONCA:
PETLA_GLOWNA_P_B_K:
NOP
JMP	PETLA_GLOWNA_P_B_K
RET

WCZYTAJ_PLIK_JADRA:
BEGIN:
PUSH	AX
MOV	DX,	[PIERWSZY_SEKTOR_Z_DANYMI]
ADD	AX,	DX
MOV	DX,	AX
MOV	CL,	1H
MOV	CH,	0H
CALL	ODCZYT_Z_DYSKU
POP	DX
CALL	NASTEPNY_CLUSTER
CALL	NORMALIZACJA_CLUSTRA
CMP	AX,	0FF7H
JBE	BEGIN
RET

NASTEPNY_CLUSTER:
PUSH	SI
MOV	AX,	DX
SHR	AX,	1H
ADD	AX,	DX
ADD	SI,	AX
MOV	AX,	[DS:SI]
POP	SI
RET

NORMALIZACJA_CLUSTRA:
TEST	DX,	1H
JZ	PARZYSTY
SHR	AX,	4H
JMP	KONIEC_N_C
PARZYSTY:
AND	AX,	0FFFH
KONIEC_N_C
RET

SEKTOR_ROOT_DIRECTORY	DW	19
WIELKOSC_ROOT_DIRECTORY	DB	14
SEKTOR_FAT	DW	1
WIELKOSC_FAT	DB	9
PIERWSZY_SEKTOR_Z_DANYMI DW	31
ENT	DB	13, 10, 0
JADRO	DB	'JADRO111COR'
BOOT_ZALADOWANY	DB	'BOOTLOADER ZALADOWANY', 13, 10, 0
ZNALEZIONE_JADRO	DB	'ZNALAZLEM JADRO. LADUJE FAT', 13, 10, 0
BLAD	DB	'BLAD O ID: ', 0
BLAD_0	DB	'0', 0
BLAD_1	DB	'1', 0

TIMES	510-($-$$)	DB	0
DW	0AA55H

jadro111:

Code: Select all

[BITS 16]
[ORG 000h]

START:
JMP	POCZATEK
GOTOWOSC_SYSTEMU	DB	13,10, 13, 10, 13, 13, 10, 'SYSTEM OPERACYJNY ZOSTAL ZALADOWANY POMYSLNIE', 13, 10
DB	'WERTYFIKACJA POPRAWNOSCI DZIALANIA BOOT LOADERA WYPADLA POMYSLNIE', 0

POCZATEK:
CLI
MOV	AX,	CS
MOV	DS,	AX
MOV	AX,	0H
MOV	SS,	AX
MOV	SP,	0FFFFH
STI
MOV	DX,	GOTOWOSC_SYSTEMU
CALL	WYPISZ_TEKST
CALL	PROCEDURA_BEZ_KONCA
WYPISZ_TEKST:
PUSH	BX
XOR	BH,	BH
MOV	BL,	03H
MOV	SI,	DX
MOV	AH,	0EH
PETLA1_1:
MOV	AL,	[SI]
CMP	AL,	0
JE	END_PETLA1_1
INT	10H
INC	SI
JMP	PETLA1_1
END_PETLA1_1:
POP	BX
RET

PROCEDURA_BEZ_KONCA:
PETLA_GLOWNA_P_B_K:
NOP
JMP	PETLA_GLOWNA_P_B_K
RET

Pleas, help me when you know how can i do..

Posted: **Tue Jan 25, 2011 1:52 am**

No-emulation and floppy emulation are mutually exclusive. If you want to stick with no-emulation, write code for the ISO 9660 filesystem instead. If you want floppy emulation, install your bootloader and kernel on a floppy (image) then supply that to your ISO tool (most people use mkisofs/genisoimage).

Both methods have corresponding tutorials in the wiki.

Posted: **Tue Jan 25, 2011 1:57 am**

Combuster wrote:No-emulation and floppy emulation are mutually exclusive. If you want to stick with no-emulation, write code for the ISO 9660 filesystem instead. If you want floppy emulation, install your bootloader and kernel on a floppy (image) then supply that to your ISO tool (most people use mkisofs/genisoimage).

Both methods have corresponding tutorials in the wiki.

It may be a guide how to make the bootloader include the jadro111.cor?

What I must edit in my code?

My code found jadro111.cor in the root directory

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