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. |
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boot.S | ||
cdboot.S | ||
diskboot.S | ||
lnxboot.S | ||
pxeboot.S |