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Red Hat Bugzilla – Attachment 661116 Details for
Bug 885240
GRUB is installed despite Do not install bootloader being selected
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parted mbr.s boot loader assembly code
mbr.s (text/plain), 2.07 KB, created by
Steve Tyler
on 2012-12-10 20:38:32 UTC
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Description:
parted mbr.s boot loader assembly code
Filename:
MIME Type:
Creator:
Steve Tyler
Created:
2012-12-10 20:38:32 UTC
Size:
2.07 KB
patch
obsolete
>; libparted - a library for manipulating disk partitions >; Copyright (C) 1999-2000, 2007, 2009-2012 Free Software Foundation, Inc. >; >; This program is free software; you can redistribute it and/or modify >; it under the terms of the GNU General Public License as published by >; the Free Software Foundation; either version 3 of the License, or >; (at your option) any later version. >; >; This program is distributed in the hope that it will be useful, >; but WITHOUT ANY WARRANTY; without even the implied warranty of >; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >; GNU General Public License for more details. >; >; You should have received a copy of the GNU General Public License >; along with this program. If not, see <http://www.gnu.org/licenses/>. > >; NOTE: I build this with: >; $ as86 -b /dev/stdout mbr.s | hexdump -e '8/1 "0x%02x, " "\n"' >; >; The build isn't done automagically by make, because as86 may not be on many >; machines (particularly non-x86). Also, it seems rather difficult to get >; as86 to build object files that can be linked, especially as it's 16 bit >; code... > >USE16 > >; This code, plus the partition table is loaded into 0000:7C00 by the BIOS > >.text > >; set top of stack to 1000:B000 > > cli > > mov ax, #0x1000 > mov ss, ax > mov sp, #0xB000 > > mov ax, #0x0000 > mov ds, ax > mov es, ax > > sti > >; Copy what the BIOS loaded (i.e. the MBR + head of partition table) from >; 0000:7c00 to 0000:0600 > > mov si, #0x7c00 > mov di, #0x0600 > mov cx, #0x200 > rep > movsb > >; Jump to the copy of the MBR > > jmp 0x0000:find_boot_partition + 0x0600 > >find_boot_partition: > mov si, #0x07BE > >check_next_bootable: > cmp [si], al > jnz found_bootable > add si, #0x0010 > cmp si, #0x07FE > jnz check_next_bootable > jmp error > >found_bootable: > >; Load in the boot sector at 0000:7c00 > > mov ah, #2 ; BIOS command (read) > mov al, #1 ; count > mov bx, #0x7c00 ; destination pointer > mov dl, #0x80 ; drive > mov dh, byte ptr [si + 1] ; head > mov cx, word ptr [si + 2] ; sector / cylinder > int #0x13 ; BIOS read interrupt > > jmp 0x0000:0x7c00 ; hand control to boot sector > >error: > jmp error
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bug 885240
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