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Index > OS Construction > Boot CD-Rom code and how to create file ISO ?
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Tos_2011



Joined: 02 Oct 2010
Posts: 4
Tos_2011 08 Nov 2010, 09:58
thank ,I understood Asm and C.
I want to live CD.I work with NASM
Code:
[org 0x7C00]
start: ;some code.example:FAT12,printstring,...
Times  510-($-$$) db 0
Dw AA55

How to code for LiveCD And command make file.iso ?
Post 08 Nov 2010, 09:58
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bitRAKE



Joined: 21 Jul 2003
Posts: 4260
Location: vpcmpistri
bitRAKE 08 Nov 2010, 15:11
I thought someone here did a bootable "El Torito" spec image from FASM. Yet, my quick search didn't turn up anything. Lots of result on Google. First one seems most helpful...

http://forum.osdev.org/viewtopic.php?f=1&t=20561
Post 08 Nov 2010, 15:11
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rugxulo



Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)
rugxulo 08 Nov 2010, 15:59
Jorg Schilling's MKISOFS.EXE should work to create one. Alexei Frounze's FAT library has a DOS/DJGPP compile. (Obviously more popular OSes have 'em too, somewhere.)
Post 08 Nov 2010, 15:59
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mindcooler



Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden
mindcooler 08 Nov 2010, 16:51
http://support.microsoft.com/kb/167685

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Post 08 Nov 2010, 16:51
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cod3b453



Joined: 25 Aug 2004
Posts: 618
cod3b453 08 Nov 2010, 19:25
You can make the ISO from FASM - note that the sector size is not 512 bytes, so it's better to use a symbolic constant rather than hardcoding if you want to have multiple boot images of the same code.

iso.asm
Code:
        ; Output
        format binary as 'iso'


        ; Macros
macro @align_null a
 {
        repeat ((a - ($ mod a)) mod a)
                db NULL
        end repeat
 }

macro iso9660_timestamp yr,mo,da,hr,mi,sc,off
 {
        db (yr - 1900)
        db mo
        db da

        db hr
        db mi
        db sc

        db off
 }

macro iso9660_dw v
 {
        dw v

        db (v shr 8)
        db (v and 0xFF)
 }

macro iso9660_dd v
 {
        dd v

        db ((v shr 24) and 0xFF)
        db ((v shr 16) and 0xFF)
        db ((v shr  8) and 0xFF)
        db (v and 0xFF)
 }

macro iso9660_ddx v
 {
        db ((v shr 24) and 0xFF)
        db ((v shr 16) and 0xFF)
        db ((v shr  8) and 0xFF)
        db (v and 0xFF)
 }

        ; Constants
        DISK_SIZE_SECTOR        equ 2048

        NULL                    equ 0

        IS09660_VDT_BOOTRECORD equ 0x00
        IS09660_VDT_PRIMARY equ 0x01
        IS09660_VDT_SUPPLEMENTARY equ 0x02
        IS09660_VDT_PARTITION equ 0x03
        IS09660_VDT_TERMINATOR equ 0xFF

        ; ISO image
        rb (16 * DISK_SIZE_SECTOR)
        db IS09660_VDT_PRIMARY
        db 'CD001'
        db 0x01
        db 0
        db '                                '
        db '                                '
        iso9660_dd 0
        iso9660_dd (iso9660.boot / DISK_SIZE_SECTOR)
        dd 0,0,0,0,0,0,0,0
        iso9660_dw 1
        iso9660_dw 1
        iso9660_dw DISK_SIZE_SECTOR
        iso9660_dd 10
        dd (iso9660.plpath / DISK_SIZE_SECTOR)
        dd 0
        iso9660_ddx (iso9660.pmpath / DISK_SIZE_SECTOR)
        dd 0
        db 0x22
        db 0x00
        iso9660_dd (iso9660.pdr / DISK_SIZE_SECTOR)
        iso9660_dd DISK_SIZE_SECTOR
        iso9660_timestamp 2000,1,1,0,0,0,0
        db 0x02
        db 0x00
        db 0x00
        iso9660_dw 0
        db 0x01
        db 0x00
        dq 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
        dq 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
        dq 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
        dq 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
        dq 0,0,0,0
        dd 0
        db 0
        dq 0,0,0,0
        dd 0
        db 0
        dq 0,0,0,0
        dd 0
        db 0
        db '2000010100000000',0
        db '2000010100000000',0
        dd 0,0,0,0
        db 0
        dd 0,0,0,0
        db 0
        db 0x01
        @align_null DISK_SIZE_SECTOR

    iso9660.brd:

        db IS09660_VDT_BOOTRECORD
        db 'CD001'
        db 0x01
        db 'EL TORITO SPECIFICATION',0
        dd 0,0
        dd 0,0,0,0,0,0,0,0
        dd (iso9660.bootcat / DISK_SIZE_SECTOR)
        @align_null DISK_SIZE_SECTOR

    iso9660.svd:

        db IS09660_VDT_SUPPLEMENTARY
        db 'CD001'
        db 0x01
        db 0x00
        dd 0,0,0,0,0,0,0,0
        db 0,'c',0,'o',0,'d',0,'3',0,'b',0,'4',0,'5',0,'3'
        db 0,'b',0,'o',0,'o',0,'t',0,' ',0,'c',0,'d',0,' '
        iso9660_dd 0
        iso9660_dd (iso9660.boot / DISK_SIZE_SECTOR)
        db 0x25,0x2F,0x45,0
        dd 0,0,0
        dd 0,0,0,0
        iso9660_dw 1
        iso9660_dw 1
        iso9660_dw DISK_SIZE_SECTOR
        iso9660_dd 10
        dd (iso9660.slpath / DISK_SIZE_SECTOR)
        dd 0
        iso9660_ddx (iso9660.smpath / DISK_SIZE_SECTOR)
        dd 0
        db 0x22
        db 0x00
        iso9660_dd (iso9660.sdr / DISK_SIZE_SECTOR)
        iso9660_dd  DISK_SIZE_SECTOR
        iso9660_timestamp 2000,1,1,0,0,0,0
        db 0x02
        db 0x00
        db 0x00
        iso9660_dw 0
        db 0x01
        db 0x00
        dq 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
        dq 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
        dq 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
        dq 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
        dq 0,0,0,0
        dd 0
        db 0
        dq 0,0,0,0
        dd 0
        db 0
        dq 0,0,0,0
        dd 0
        db 0
        db '2000010100000000',0
        db '2000010100000000',0
        dd 0,0,0,0
        db 0
        dd 0,0,0,0
        db 0
        db 0x01
        @align_null DISK_SIZE_SECTOR

    iso9660.tvd:

        db IS09660_VDT_TERMINATOR
        db 'CD001'
        db 0x01
        @align_null DISK_SIZE_SECTOR

    iso9660.boot:

        ; The boot sector
        include 'boot.asm'

        org (21 * DISK_SIZE_SECTOR)

    iso9660.bootcat:

        db 0x01
        db 0x00
        dw 0
        dd 0,0,0,0,0,0
        db 0xAA,0x55
        db 0x55,0xAA
        db 0x88
        db 0x00
        dw 0x0000
        db 0x00
        db 0
        dw 0x0004
        dd (iso9660.boot / DISK_SIZE_SECTOR)
        @align_null DISK_SIZE_SECTOR

    iso9660.pdr:

        db 0x22
        db 0x00
        iso9660_dd (iso9660.pdr / DISK_SIZE_SECTOR)
        iso9660_dd DISK_SIZE_SECTOR
        iso9660_timestamp 2000,1,1,0,0,0,0
        db 0x02
        db 0
        db 0
        iso9660_dw 0
        db 0x01
        db 0x00

        db 0x22
        db 0x00
        iso9660_dd (iso9660.pdr / DISK_SIZE_SECTOR)
        iso9660_dd 2048
        iso9660_timestamp 2000,1,1,0,0,0,0
        db 0x02
        db 0
        db 0
        iso9660_dw 0
        db 0x01
        db 0x01
        @align_null DISK_SIZE_SECTOR

    iso9660.plpath:

        db 0x01
        db 0x00
        dd (iso9660.pdr / DISK_SIZE_SECTOR)
        dw 1
        dw 0
        @align_null DISK_SIZE_SECTOR

    iso9660.pmpath:

        db 0x01
        db 0x00
        iso9660_ddx (iso9660.pdr / DISK_SIZE_SECTOR)
        iso9660_dw 1
        iso9660_dw 0
        @align_null DISK_SIZE_SECTOR

    iso9660.sdr:

        db 0x22
        db 0x00
        iso9660_dd (iso9660.sdr / DISK_SIZE_SECTOR)
        iso9660_dd DISK_SIZE_SECTOR
        iso9660_timestamp 2000,1,1,0,0,0,0
        db 0x02
        db 0
        db 0
        iso9660_dw 0
        db 0x01
        db 0x00

        db 0x22
        db 0x00
        iso9660_dd (iso9660.sdr / DISK_SIZE_SECTOR)
        iso9660_dd DISK_SIZE_SECTOR
        iso9660_timestamp 2000,1,1,0,0,0,0
        db 0x02
        db 0
        db 0
        iso9660_dw 0
        db 0x01
        db 0x01
        @align_null DISK_SIZE_SECTOR

    iso9660.slpath:

        db 0x01
        db 0x00
        dd (iso9660.sdr / DISK_SIZE_SECTOR)
        dw 1
        dw 0
        @align_null DISK_SIZE_SECTOR

    iso9660.smpath:

        db 0x01
        db 0x00
        iso9660_ddx (iso9660.sdr / DISK_SIZE_SECTOR)
        iso9660_dw 1
        iso9660_dw 0
        @align_null DISK_SIZE_SECTOR

        ; Other disk data can go here

boot.asm
Code:
        org 0x7C00

        cli
        jmp 0:@f

    @@:

        mov ax,0xB800
        mov ds,ax
        mov word [ds:0],'Hi'

        xor ah,ah
        int 0x16

        times (0x7C00 + DISK_SIZE_SECTOR - $ - 2) db 0
        dw 0xAA55
(apologies -- this is a merge of 5/6 files to save space)

Hope that helps Cool
Post 08 Nov 2010, 19:25
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egos



Joined: 10 Feb 2009
Posts: 144
egos 09 Nov 2010, 12:45
I'm still developing mkisofs.inc for fasm and boot code for cdfs (iso9660). You can take current version of mkisofs.inc here, but be careful because it's experimental version. In boot code now I use the method that's realized in GRUB. I'm storing position and size of the loading file in boot code. I can show basic routines from my boot code.

cdrom.asc
Code:
include "mkimage/mkisofs.inc"

rb 16*2048 ; system area
primvd
bootrec
termvd
bootcat
lpt
mpt

defdir root
{
dent kernel,"KERNEL.BIN",FA_DEF
dent readme,"README.TXT",FA_DEF
}

stof boot,"bootcode.bin" ; boot is reserved name for boot code
store dword kernel_base/2048 at boot_base+16
store dword kernel_size at boot_base+20
stod root,root ; root is reserved name for root directory
stof kernel,"content/kernel.bin"
stof kernel,"content/readme.txt"

fixvol


Code:
;
; ax:cx - starting sector number
; dx - file size in kilobytes
; bx - buffer base in paragraphs (will be recalculated)
;
loadfile:
  mov word [dapack.lba],ax
  mov word [dapack.lba+2],cx
  mov ax,SPB
  shr dx,1
  pushf
  jmp short @f
.read1:
  xor dx,dx
.read2:
  push dx
  call read
  pop dx
  push ax
  aam 2
  ror al,1
  add bx,ax
  pop ax
@@:
  sub dx,ax
  jnc short .read2
  add ax,dx
  jnz short .read1
  popf
  jnc short @f
  push bx
  mov bx,BUFSEG
  inc ax
  call read
  pop bx
  mov es,bx
  add bx,40h
  mov si,BUFSEG shl 4
  xor di,di
  mov cx,512
  rep movsw
@@:
  ret
tryagain:
  dec ah
  jnz short @f
  call putstr
  db 13,10,"Disk read error",0
bootfailure:
  call putstr
  db 13,10,"Disk boot failure",0
;
; dword [dapack.lba] - starting sector number (will recalculated)
; ax - number of sectors to read (not abave 127)
; bx - buffer base in paragraphs
;
read:
  mov word [dapack.pointer+2],bx
  mov ah,MAXTRIES
  push bx
@@:
  mov si,dapack
  mov [dapack.length],al
  mov dl,[drive]
  push ax
  mov ah,42h
  int 13h
  pop ax
  jc short tryagain
  pop bx
  cbw
  add word [dapack.lba],ax
  adc word [dapack.lba+2],0
  jc short bootfailure
  ret


Description:
Download
Filename: mkisofs.zip
Filesize: 1.02 KB
Downloaded: 682 Time(s)

Post 09 Nov 2010, 12:45
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