wanna make a boot loader compatible to GRUB

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m

Joined: 28 Dec 2006
Posts: 304
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m 25 Jan 2009, 08:49

hi all,
i am not sure if post it here or in Linux section.
basically i want to write a simple OS, and want it's boot loader to be loaded from file system using grub (from grub command line?)

does anybody have any help?

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25 Jan 2009, 08:49

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20516
Location: In your JS exploiting you and your system

revolution 25 Jan 2009, 08:53

Do you mean you want to "boot" your OS from a Linux command line?

If so, then just give ring0 access to your boot loader, come out of protected mode (this part can be tricky to make sure the memory is mapped correctly), and execute your OS with a jmp.

25 Jan 2009, 08:53

m

Joined: 28 Dec 2006
Posts: 304
Location: in

m 25 Jan 2009, 09:02

thanks revolution,
but what i was thinking is:
suppose i need to make a hello world OS, and a hello world boot loader Smile

i either need a floppy for boot loader or need to risk my hard disk partition (if i write BL there)
what if my boot loader is not in the 1st sector of floppy or HD?
can i just follow some grub conventions (so that grub can load my BL), and create arbitrary no. of BL in my, say, home directory, so that i can choose whichever of my BLs from GRUB command line?

makes sense?

25 Jan 2009, 09:02

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20516
Location: In your JS exploiting you and your system

revolution 25 Jan 2009, 09:09

There are also USB and CD booting available. Perhaps also a VM for your testing?

25 Jan 2009, 09:09

neville

Joined: 13 Jul 2008
Posts: 507
Location: New Zealand

neville 25 Jan 2009, 09:21

revolution wrote:

..come out of protected mode (this part can be tricky to make sure the memory is mapped correctly) ..

another disadvantage and hassle caused by paged memory!
Sorry, couldn't help myself Laughing

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25 Jan 2009, 09:21

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20516
Location: In your JS exploiting you and your system

revolution 25 Jan 2009, 09:54

neville wrote:

revolution wrote:
..come out of protected mode (this part can be tricky to make sure the memory is mapped correctly) ..
another disadvantage and hassle caused by paged memory!
Sorry, couldn't help myself

Ah, neville the incorrigible. Wink

25 Jan 2009, 09:54

m

Joined: 28 Dec 2006
Posts: 304
Location: in

m 25 Jan 2009, 11:15

Quote:

There are also USB and CD booting available. Perhaps also a VM for your testing?

revolution can you point me to any such site/tutorial for learning this?

25 Jan 2009, 11:15

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20516
Location: In your JS exploiting you and your system

revolution 25 Jan 2009, 11:20

This very board:

http://board.flatassembler.net/topic.php?t=9645

25 Jan 2009, 11:20

m

Joined: 28 Dec 2006
Posts: 304
Location: in

m 25 Jan 2009, 11:34

thanks

25 Jan 2009, 11:34

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