mirror of
https://git.proxmox.com/git/grub2
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9be6b98b6f
Add support for having a grub directory in a different drive. This
is still only the data handling part.
* kern/i386/pc/startup.S (multiboot_trampoline): Set %dh to 0xFF.
(codestart): Save %dh in GRUB_ROOT_DRIVE.
(grub_root_drive): New variable.
* kern/i386/pc/init.c (make_install_device): Use GRUB_ROOT_DRIVE
instead of GRUB_BOOT_DRIVE to construct a device name. Set
GRUB_ROOT_DRIVE to GRUB_BOOT_DRIVE if it is 0xFF, otherwise use it
as it was.
* include/grub/i386/pc/kernel.h (grub_root_drive): New prototype.
* include/grub/i386/pc/boot.h (GRUB_BOOT_MACHINE_ROOT_DRIVE): New
macro.
(GRUB_BOOT_MACHINE_DRIVE_CHECK): Set to 0x4f.
* boot/i386/pc/pxeboot.S (_start): Set %dh to 0xFF. For now, this
is bogus, because PXE booting does not specify any drive
correctly.
* boot/i386/pc/lnxboot.S (reg_edx): Set the second byte to 0xFF. I
am not sure if this is really correct.
* boot/i386/pc/cdboot.S: Set %dh to 0xFF, because the root drive
is always identical to the boot drive when booting from a CD.
* boot/i386/pc/boot.S (MOV_MEM_TO_AL): Removed. Not needed any
longer.
(root_drive): New variable.
(real_start): Unconditionally set %dh to ROOT_DRIVE.
(setup_sectors): Push %dx right after popping it, because %dh will
be modified later.
(copy_buffer): Restore %dx.
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2002,2005,2006,2007,2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GRUB_BOOT_MACHINE_HEADER
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#define GRUB_BOOT_MACHINE_HEADER 1
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/* The signature for bootloader. */
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#define GRUB_BOOT_MACHINE_SIGNATURE 0xaa55
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/* The offset of the start of BPB (BIOS Parameter Block). */
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#define GRUB_BOOT_MACHINE_BPB_START 0x3
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/* The offset of the end of BPB (BIOS Parameter Block). */
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#define GRUB_BOOT_MACHINE_BPB_END 0x3e
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/* The offset of the major version. */
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#define GRUB_BOOT_MACHINE_VER_MAJ 0x3e
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/* The offset of BOOT_DRIVE. */
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#define GRUB_BOOT_MACHINE_BOOT_DRIVE 0x4c
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/* The offset of ROOT_DRIVE. */
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#define GRUB_BOOT_MACHINE_ROOT_DRIVE 0x4d
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/* The offset of KERNEL_ADDRESS. */
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#define GRUB_BOOT_MACHINE_KERNEL_ADDRESS 0x40
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/* The offset of KERNEL_SECTOR. */
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#define GRUB_BOOT_MACHINE_KERNEL_SECTOR 0x44
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/* The offset of KERNEL_SEGMENT. */
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#define GRUB_BOOT_MACHINE_KERNEL_SEGMENT 0x42
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/* The offset of BOOT_DRIVE_CHECK. */
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#define GRUB_BOOT_MACHINE_DRIVE_CHECK 0x4f
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/* The offset of a magic number used by Windows NT. */
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#define GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC 0x1b8
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/* The offset of the start of the partition table. */
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#define GRUB_BOOT_MACHINE_PART_START 0x1be
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/* The offset of the end of the partition table. */
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#define GRUB_BOOT_MACHINE_PART_END 0x1fe
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/* The stack segment. */
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#define GRUB_BOOT_MACHINE_STACK_SEG 0x2000
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/* The segment of disk buffer. The disk buffer MUST be 32K long and
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cannot straddle a 64K boundary. */
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#define GRUB_BOOT_MACHINE_BUFFER_SEG 0x7000
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/* The flag for BIOS drive number to designate a hard disk vs. a
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floppy. */
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#define GRUB_BOOT_MACHINE_BIOS_HD_FLAG 0x80
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/* The segment where the kernel is loaded. */
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#define GRUB_BOOT_MACHINE_KERNEL_SEG 0x800
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/* The address where the kernel is loaded. */
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#define GRUB_BOOT_MACHINE_KERNEL_ADDR (GRUB_BOOT_MACHINE_KERNEL_SEG << 4)
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/* The size of a block list used in the kernel startup code. */
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#define GRUB_BOOT_MACHINE_LIST_SIZE 12
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#endif /* ! BOOT_MACHINE_HEADER */
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