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BootLoader

Started by Larry91 Sep 4, 2010 at 7:10 AM 1 replies 800+ views

Original Post

Sep 4, 2010 at 7:10 AM

Hello everybody!
I want to create an ASM bootloader that load my c++ OS that is located on the disk! Will you give me a simple tutorial, please?
I prefer to write my OS in Microsoft VC++.

I try this:

;------------------------------------------------------------.286							   ; CPU type;------------------------------------------------------------.model TINY						   ; memory of model;---------------------- EXTERNS -----------------------------extrn				_BootMain:near	   ; prototype of C func;------------------------------------------------------------;------------------------------------------------------------   .code   org				07c00h		   ; for BootSectormain:				jmp short start	   ; go to main				nop						;----------------------- CODE SEGMENT -----------------------start:	        cli        mov ax,cs               ; Setup segment registers        mov ds,ax               ; Make DS correct        mov es,ax               ; Make ES correct        mov ss,ax               ; Make SS correct                mov bp,7c00h        mov sp,7c00h            ; Setup a stack        sti                                ; start the program         call           _BootMain        ret                END main                ; End of program

Larry91

Sep 4, 2010 at 9:35 AM

I solved! It's working!
How can I load from bootloader a file (.com) from the HDD?

Dr Yap

Sep 4, 2010 at 9:45 AM

Try the osdev specific websites such as:

osdev.org
osdever.net

You need to create a kernel that can do i/o processes with the HDD and also use the file system (most likely NTFS). The websites above have tutorials and links to help you.

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