From: Aleph One <amerei@gmail.com>
To: linux-assembly@vger.kernel.org
Subject: grub thing
Date: Wed, 1 Mar 2006 07:10:33 +0000 [thread overview]
Message-ID: <20060301071033.0c9eb1d4.amerei@gmail.com> (raw)
In-Reply-To: <200602222126.57346.thiago.silva@kdemail.net>
hello all!
i'm _that_ boy (again) from last christmas.. hehehe didn't think i'd reach this far though and i just wanna clarify something.
i'm looking at a disassembly of grub's stage 1. and i wanna know why it need's to CLI before setting up the environment?? i tried to interpret it line by line and this is what i have so far
00007C4A FA cli ; disable interrupt
00007C4B 80CA80 or dl,0x80 ; correct boot drive byte
00007C4E EA537C0000 jmp 0x0:0x7c53 ; jmp to next inst
00007C53 31C0 xor ax,ax ; zero ax
00007C55 8ED8 mov ds,ax ; zero data segment
00007C57 8ED0 mov ss,ax ; zero stack segment
00007C59 BC0020 mov sp,0x2000 ; 8 kilobytes
00007C5C FB sti ; enable interrupt
also, since the origin is at 0000:7c00h i figured that must imply that "mov sp, 0x2000" means that the stack starts at 0x7c00+0x2000 = 9c000 right?
today is ash wednesday. tidings.
next prev parent reply other threads:[~2006-03-01 7:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-22 21:26 nasm -f bin / Elf format Thiago Silva
2006-02-23 0:32 ` Brian Raiter
2006-03-01 7:10 ` Aleph One [this message]
2006-03-01 13:34 ` grub thing Ricardo Nabinger Sanchez
2006-03-02 6:49 ` Aleph One
2006-03-01 14:42 ` Marcin Kościelnicki
2006-03-01 18:08 ` Ricardo Nabinger Sanchez
2006-03-02 6:46 ` Aleph One
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